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Document And Entity Information - shares	6 Months Ended
Document And Entity Information - shares	Jun. 30, 2020	Aug. 05, 2020
Document Information [Line Items]
Entity Registrant Name	Vaxart, Inc.
Entity Central Index Key	0000072444
Trading Symbol	vxrt
Current Fiscal Year End Date	--12-31
Entity Filer Category	Non-accelerated Filer
Entity Current Reporting Status	Yes
Entity Emerging Growth Company	false
Entity Small Business	true
Entity Interactive Data Current	Yes
Entity Common Stock, Shares Outstanding (in shares)		109,201,829
Entity Shell Company	false
Document Type	10-Q
Document Period End Date	Jun. 30, 2020
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q2
Amendment Flag	false
Title of 12(b) Security	Common Stock, $0.10 par value

Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 44,388	$ 13,526
Accounts receivable	227	3,619
Prepaid expenses and other current assets	1,111	453
Total current assets	45,726	17,598
Property and equipment, net	345	210
Right-of-use assets, net	1,755	1,990
Intangible assets, net	16,227	17,093
Other long-term assets	137	141
Total assets	64,190	37,032
Current liabilities:
Accounts payable	1,166	852
Current portion of operating lease liability	804	841
Liability related to sale of future royalties, current portion	3,150	2,916
Other accrued liabilities	6,378	4,565
Total current liabilities	11,498	9,174
Operating lease liability, net of current portion	1,120	1,472
Liability related to sale of future royalties, net of current portion	11,319	13,416
Other long-term liabilities	18	18
Total liabilities	23,955	24,080
Commitments and contingencies (Note 9)
Stockholders’ equity:
Preferred stock: $0.0001 par value; 5,000,000 shares authorized; none issued and outstanding as of June 30, 2020 and December 31, 2019
Common stock: $0.0001 par value; 150,000,000 shares authorized; 96,140,661 and 48,254,994 shares issued and outstanding as of June 30, 2020 and December 31, 2019, respectively	10	5
Additional paid-in capital	167,160	129,608
Accumulated deficit	(126,935)	(116,661)
Total stockholders’ equity	40,235	12,952
Total liabilities and stockholders’ equity	$ 64,190	$ 37,032

Condensed Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - $ / shares	Jun. 30, 2020	Dec. 31, 2019
Preferred stock, par value (in dollars per share)	$ 0.0001	$ 0.0001
Preferred stock, shares authorized (in shares)	5,000,000	5,000,000
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.0001	$ 0.0001
Common stock, shares authorized (in shares)	150,000,000	150,000,000
Common stock, shares issued (in shares)	96,140,661	48,254,994
Common stock, shares outstanding (in shares)	96,140,661	48,254,994

Condensed Consolidated Statements of Operations and Comprehensive Loss (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Revenue:
Revenue	$ 523	$ 85	$ 3,425	$ 5,492
Operating expenses:
Research and development	5,114	3,707	6,656	7,536
General and administrative	3,896	1,375	5,886	3,401
Restructuring costs	39		103
Total operating expenses	9,049	5,082	12,645	10,937
Operating loss	(8,526)	(4,997)	(9,220)	(5,445)
Other income and (expenses):
Interest income	23	34	64	39
Interest expense		(97)		(204)
Non-cash interest expense related to sale of future royalties	(446)	(516)	(937)	(1,060)
Foreign exchange loss, net	(2)	(48)	(2)	(43)
Total other income and (expenses)	(425)	(627)	(875)	(1,268)
Net loss before income taxes	(8,951)	(5,624)	(10,095)	(6,713)
Provision for income taxes	26	13	179	263
Net loss	$ (8,977)	$ (5,637)	$ (10,274)	$ (6,976)
Net loss per share - basic and diluted (in dollars per share)	$ (0.12)	$ (0.39)	$ (0.15)	$ (0.64)
Shares used to compute net loss per share - basic and diluted (in shares)	74,675,131	14,597,446	67,676,138	10,969,473
Customer Service Contracts [Member]
Revenue:
Revenue	$ 92		$ 191
Royalty [Member]
Revenue:
Revenue	193	69	2,962	3,728
Non Cash Royalty Revenue [Member]
Revenue:
Revenue	$ 238	$ 16	$ 272	$ 1,764

Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($) $ in Thousands	Underwriters' Designees [Member] Additional Paid-in Capital [Member]	Underwriters' Designees [Member]	Placement Agents' Designees [Member] Additional Paid-in Capital [Member]	Placement Agents' Designees [Member]	Cumulative Effect, Period of Adoption, Adjustment [Member] Retained Earnings [Member]	Cumulative Effect, Period of Adoption, Adjustment [Member]	Cumulative Effect, Period of Adoption, Adjusted Balance [Member] Common Stock [Member]	Cumulative Effect, Period of Adoption, Adjusted Balance [Member] Additional Paid-in Capital [Member]	Cumulative Effect, Period of Adoption, Adjusted Balance [Member] Retained Earnings [Member]	Cumulative Effect, Period of Adoption, Adjusted Balance [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Total
Balances (in shares) at Dec. 31, 2018							7,141,189,000				7,141,189
Balances at Dec. 31, 2018					$ (27)	$ (27)	$ 1	$ 109,226	$ (98,016)	$ 11,211	$ 1	$ 109,226	$ (97,989)	$ 11,238
Issuance of common stock upon exercise of common stock warrants											1	651		$ 652
Issuance of common stock upon exercise of stock options (in shares)														0
Stock-based compensation												344		$ 344
Net loss													(6,976)	(6,976)
Issuance of common stock and common stock warrants, net of offering costs (in shares)											925,455
Issuance of common stock and common stock warrants, net of offering costs												7,741		7,741
Issuance of common stock warrants to placement agents’ designees	$ 333	$ 333	$ 100	$ 100
Issuance of common stock upon exercise of pre-funded warrants (in shares)											6,519,091
Issuance of common stock, net of offering costs (in shares)											1,200,000
Issuance of common stock, net of offering costs												2,440		2,440
Balances (in shares) at Jun. 30, 2019											15,785,735
Balances at Jun. 30, 2019											$ 2	120,835	(104,992)	15,845
Balances (in shares) at Mar. 31, 2019											8,341,189
Balances at Mar. 31, 2019											$ 1	111,930	(99,355)	12,576
Issuance of common stock upon exercise of common stock warrants											1	651		652
Stock-based compensation												180		180
Net loss													(5,637)	(5,637)
Issuance of common stock and common stock warrants, net of offering costs (in shares)											925,455
Issuance of common stock and common stock warrants, net of offering costs												7,741		7,741
Issuance of common stock warrants to placement agents’ designees	$ 333	$ 333
Issuance of common stock upon exercise of pre-funded warrants (in shares)											6,519,091
Balances (in shares) at Jun. 30, 2019											15,785,735
Balances at Jun. 30, 2019											$ 2	120,835	(104,992)	15,845
Balances (in shares) at Dec. 31, 2019											48,254,994
Balances at Dec. 31, 2019											$ 5	129,608	(116,661)	12,952
Issuance of common stock upon exercise of common stock warrants (in shares)											43,707,286
Issuance of common stock upon exercise of common stock warrants											$ 5	24,653		$ 24,658
Issuance of common stock upon exercise of stock options (in shares)											178,381			178,381
Issuance of common stock upon exercise of stock options												116		$ 116
Disgorgement of short-swing profits, net of costs												652		652
Stock-based compensation												2,956		2,956
Net loss													(10,274)	(10,274)
Issuance of common stock and common stock warrants, net of offering costs (in shares)											4,000,000
Issuance of common stock and common stock warrants, net of offering costs												8,722		8,722
Issuance of common stock warrants to placement agents’ designees			$ 453	$ 453
Balances (in shares) at Jun. 30, 2020											96,140,661
Balances at Jun. 30, 2020											$ 10	167,160	(126,935)	40,235
Balances (in shares) at Mar. 31, 2020											72,004,720
Balances at Mar. 31, 2020											$ 7	149,244	(117,958)	31,293
Issuance of common stock upon exercise of common stock warrants (in shares)											23,981,166
Issuance of common stock upon exercise of common stock warrants											$ 3	14,306		14,309
Issuance of common stock upon exercise of stock options (in shares)											154,775
Issuance of common stock upon exercise of stock options												98		98
Disgorgement of short-swing profits, net of costs												652		652
Stock-based compensation												2,860		2,860
Net loss													(8,977)	(8,977)
Balances (in shares) at Jun. 30, 2020											96,140,661
Balances at Jun. 30, 2020											$ 10	$ 167,160	$ (126,935)	$ 40,235

Condensed Consolidated Statements of Stockholders' Equity (Unaudited) (Parentheticals) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Offering costs from issuance of common stock and warrants	$ 1,579	$ 1,278	$ 1,579
Offering costs			$ 560

Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Cash flows from operating activities:
Net loss	$ (10,274,000)	$ (6,976,000)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	1,193,000	2,097,000
Stock-based compensation	2,956,000	344,000
Non-cash interest expense		64,000
Non-cash interest expense related to sale of future royalties	937,000	1,060,000
Non-cash revenue related to sale of future royalties	(2,800,000)	(3,132,000)
Change in operating assets and liabilities:
Accounts receivable	3,392,000	1,761,000
Prepaid expenses and other assets	(657,000)	530,000
Accounts payable	148,000	(347,000)
Other accrued liabilities	1,376,000	(371,000)
Net cash used in operating activities	(3,729,000)	(4,970,000)
Cash flows from investing activities:
Purchase of property and equipment	(13,000)	(711,000)
Proceeds from sale of equipment	3,000
Net cash used in investing activities	(10,000)	(711,000)
Cash flows from financing activities:
Net proceeds from issuance of securities in registered direct offering	9,175,000	2,540,000
Net proceeds from issuance of common stock, pre-funded warrants and common warrants in April 2019 underwritten offering		8,074,000
Proceeds from issuance of common stock upon exercise of pre-funded warrants		652,000
Proceeds from issuance of common stock upon exercise of common stock warrants	24,658,000
Proceeds from issuance of common stock upon exercise of stock options	116,000
Disgorgement of short-swing profits, net of costs	652,000
Repayment of principal on secured promissory note payable to Oxford Finance		(833,000)
Net cash provided by financing activities	34,601,000	10,433,000
Net increase in cash and cash equivalents	30,862,000	4,752,000
Cash, cash equivalents and restricted cash at beginning of the period	13,526,000	11,506,000
Cash, cash equivalents and restricted cash at end of the period	44,388,000	16,258,000
Supplemental disclosure of cash flow information:
Interest paid		136,000
Supplemental disclosure of non-cash financing activity:
Issuance of warrants to placement agent’s representatives	453,000	100,000
Issuance of warrants to underwriters’ designees		333,000
Acquisition of property and equipment included in accounts payable	$ 170,000	$ 47,000

Note 1 - Organization and Basis of Presentation	6 Months Ended
Note 1 - Organization and Basis of Presentation	Jun. 30, 2020
Notes to Financial Statements
Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block]	VAXART , INC. AND SUBSIDIARIES Notes to the Condensed Consolidated Financial Statements (Unaudited) NOTE 1. Organization and Basis of Presentation General Vaxart Biosciences, Inc. was originally incorporated in California in March 2004, under the name West Coast Biologicals, Inc. The Company changed its name to Vaxart, Inc. (“Private Vaxart”) in July 2007, and reincorporated in the state of Delaware. On February 13, 2018, Private Vaxart completed a business combination with Aviragen Therapeutics, Inc. (“Aviragen”), pursuant to which Aviragen merged with Private Vaxart, with Private Vaxart surviving as a wholly-owned subsidiary of Aviragen (the “Merger”). Pursuant to the terms of the Merger, Aviragen changed its name to Vaxart, Inc. (together with its subsidiaries, the “Company” or “Vaxart”) and Private Vaxart changed its name to Vaxart Biosciences, Inc. All of Private Vaxart's convertible promissory notes and convertible preferred stock was converted into common stock, following which each share of common stock was converted into approximately 0.22148 shares of the Company's common stock (the “Conversion”). On March 2, 2020, the Company completed a registered direct offering (the “March 2020 Offering”) of 4,000,000 shares of the Company's common stock and warrants to purchase 2,000,000 shares of common stock. Each common stock warrant entitles the holder to purchase one share of common stock for $2.50, is exercisable immediately, subject to certain ownership limitations, and will expire five years from the date of issuance. The total gross proceeds from the offering to the Company were $10.0 million. After deducting placement agent fees and offering expenses payable by the Company, the aggregate net proceeds received by the Company totaled $9.2 million. Pursuant to the terms of the engagement letter with the placement agents, the Company paid the placement agents aggregate fees and reimbursable costs of $775,000. In addition, the Company issued the placement agents' designees 280,000 common stock warrants at the closing of the March 2020 Offering, each warrant entitling the holder to purchase one share of common stock for $3.125 at any time within five years of the effective date of the March 2020 Offering. The aggregate fair value of these warrants at issuance was estimated to be $453,000 (see Note 10 ), which was recorded in offering costs. On June 8, 2020, the Company's shareholders approved an amendment to the Company's certificate of incorporation to change the par value of its common and preferred stock from $0.10 per share to $0.0001 per share and to increase the number of authorized shares of common stock from 100,000,000 to 150,000,000. Except as otherwise noted in these condensed consolidated financial statements, all share, equity security and per share amounts are presented to give retroactive effect to these changes. The Company's principal operations are based in South San Francisco, California, and it operates in one reportable segment, which is the discovery and development of oral recombinant protein vaccines, based on its proprietary oral vaccine platform.

Note 2 - Summary of Significant Accounting Policies	6 Months Ended
Note 2 - Summary of Significant Accounting Policies	Jun. 30, 2020
Notes to Financial Statements
Significant Accounting Policies [Text Block]	NOTE 2. Summary of Significant Accounting Policies Basis of Presentation – The Company has prepared the accompanying condensed consolidated financial statements pursuant to the rules and regulations of the Securities and Exchange Commission (“SEC”). Certain information and footnote disclosures normally included in consolidated financial statements prepared in accordance with accounting principles generally accepted in the United States of America (“U.S. GAAP”) have been condensed or omitted pursuant to these rules and regulations. These condensed consolidated financial statements should be read in conjunction with the Company's audited financial statements and footnotes related thereto for the year ended December 31, 2019, included in the Company's Annual Report on Form 10 -K filed with the SEC on March 19, 2020 ( the “Annual Report”). Except as noted below, there have been no material changes to the Company's significant accounting policies described in Note 2 to the consolidated financial statements included in the Annual Report. In the opinion of management, the unaudited condensed consolidated financial statements include all adjustments (consisting only of normal recurring adjustments) necessary to present fairly the Company's financial position and the results of its operations and cash flows. The results of operations for such interim periods are not necessarily indicative of the results to be expected for the full year. Basis of Consolidation – The condensed consolidated financial statements include the financial statements of Vaxart, Inc. and its subsidiaries. All significant transactions and balances between Vaxart, Inc. and its subsidiaries have been eliminated in consolidation. Use of Estimates – The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets, liabilities, revenues and expenses and disclosure of contingent assets and liabilities in the financial statements and accompanying notes. Actual results and outcomes could differ from these estimates and assumptions. Concentration of Credit Risk – Financial instruments that potentially subject the Company to significant concentrations of credit risk consist principally of cash, cash equivalents and accounts receivable. The Company places its cash and cash equivalents at financial institutions that management believes are of high credit quality. The Company is exposed to credit risk in the event of default by the financial institutions holding the cash and cash equivalents to the extent such amounts are in excess of the federally insured limits. The Company has not experienced any losses on its deposits since inception. The primary focus of the Company's investment strategy is to preserve capital and meet liquidity requirements. The Company's investment policy addresses the level of credit exposure by limiting the concentration in any one corporate issuer or sector and establishing a minimum allowable credit rating. The Company generally requires no collateral from its customers. Reclassification – Prior periods' data is subject to reclassification to conform to the current presentation. Accordingly, $40,000 and $88,000 that were previously recorded as non-lease costs have been included as variable lease costs and in cash outflows related to leases in the three and six months ended June 30, 2019, respectively. This reclassification had no effect on reported net loss. Recent Accounting Pronouncements The Company believes that the impact of accounting standards updates recently issued that are not yet effective will not have a material impact on its financial position or results of operations upon adoption.

Note 3 - Fair Value of Financial Instruments	6 Months Ended
Note 3 - Fair Value of Financial Instruments	Jun. 30, 2020
Notes to Financial Statements
Fair Value Disclosures [Text Block]	NOTE 3 . Fair Value of Financial Instruments Fair value accounting is applied for all financial assets and liabilities and nonfinancial assets and liabilities that are recognized or disclosed at fair value in the financial statements on a recurring basis (at least annually). Financial instruments include cash and cash equivalents, accounts receivable, accounts payable and accrued liabilities that approximate fair value due to their relatively short maturities. Assets and liabilities recorded at fair value on a recurring basis in the balance sheets are categorized based upon the level of judgment associated with inputs used to measure their fair values. The accounting guidance for fair value provides a framework for measuring fair value and requires certain disclosures about how fair value is determined. Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability (an exit price) in an orderly transaction between market participants at the reporting date. The accounting guidance also establishes a three -level valuation hierarchy that prioritizes the inputs to valuation techniques used to measure fair value based upon whether such inputs are observable or unobservable. Observable inputs reflect market data obtained from independent sources, while unobservable inputs reflect market assumptions made by the reporting entity. The three -level hierarchy for the inputs to valuation techniques is briefly summarized as follows: Level 1 – Inputs are unadjusted, quoted prices in active markets for identical assets or liabilities at the measurement date; Level 2 – Inputs are observable, unadjusted quoted prices in active markets for similar assets or liabilities, unadjusted quoted prices for identical or similar assets or liabilities in markets that are not active, or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the related assets or liabilities; and Level 3 – Unobservable inputs that are significant to the measurement of the fair value of the assets or liabilities that are supported by little or no market data. The Company's money market funds are classified within Level 1 of the fair value hierarchy and are valued based on quoted prices in active markets for identical securities. The Company held no recurring financial assets that are measured at fair value as of June 30, 2020. The Company held $15,000 in money market funds, classified as cash equivalents, as of December 31, 2019. The Company held no recurring financial liabilities at either date or in the six months ended June 30, 2020 or 2019.

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

+ References + Details

Note 4 - Balance Sheet Components

6 Months Ended

Jun. 30, 2020

Notes to Financial Statements

Supplemental Balance Sheet Disclosures [Text Block]

NOTE

Balance Sheet Components

(a)

Cash and Cash Equivalents

Cash and cash equivalents comprises the following:

	June 30, 2020		December 31, 2019
	(in thousands)
Cash at banks	$	44,388	$	13,511
Money market funds		—		15
Total cash and cash equivalents	$	44,388	$	13,526

(b)

Accounts Receivable

Accounts receivable comprises the following:

	June 30, 2020		December 31, 2019
	(in thousands)
Royalties receivable	$	227	$	3,438
Customer service contracts - billed		—		181
Accounts receivable	$	227	$	3,619

The Company has provided

allowance for uncollectible accounts as of

June 30, 2020

and

December 31, 2019.

(c)

Property and Equipment, Net

Property and equipment, net consists of the following:

	June 30, 2020			December 31, 2019
	(in thousands)
Laboratory equipment	$	706		$	537
Office and computer equipment		142			132
Total property and equipment		848			669
Less: accumulated depreciation		(503	)		(459	)
Property and equipment, net	$	345		$	210

Depreciation expense was

$25,000

and

$125,000

for the

three

months ended

June 30,

2020

and

2019

, respectively, and

$44,000

and

$255,000

for the

six

months ended

June 30,

2020

and

2019

, respectively. There were

impairments of the Company's property and equipment recorded in the

six

months ended

June 30,

2020

2019

(d)

Right-of-Use Assets

, Net

Right-of-use assets, net consists of the following:

	June 30, 2020		December 31, 2019
	(in thousands)
Facilities	$	1,751	$	1,985
Office equipment		4		5
Right-of-use assets, net	$	1,755	$	1,990

(e)

Intangible Assets, Net

Intangible assets comprise developed technology and intellectual property. Intangible assets are carried at cost less accumulated amortization. Amortization is computed using the straight-line method over useful lives ranging from

1.3

11.75

years for developed technology and

years for intellectual property.

As of

June 30, 2020

, developed technology and intellectual property had remaining lives of

9.4

and

7.5

years, respectively. Intangible assets consist of the following:

	June 30, 2020			December 31, 2019
	(in thousands)
Purchased technology	$	22,100		$	22,100
Intellectual property		80			80
Total cost		22,180			22,180
Less: accumulated amortization		(5,953	)		(5,087	)
Intangible assets, net	$	16,227		$	17,093

Total amortization expense for the

three

months ended

June 30,

2020

and

2019

, was

$433,000

and

$675,000,

respectively, and for the

six

months ended

June 30,

2020

and

2019

, was

$866,000

and

$1,454,000,

respectively.

As of

June 30, 2020

, the estimated future amortization expense by year is as follows (in thousands):

Year Ending December 31,	Amount
2020 (six months remaining)	$	866
2021		1,732
2022		1,731
2023		1,732
2024		1,732
Thereafter		8,434
Total	$	16,227

(f)

Other Accrued Liabilities

Other accrued liabilities consist of the following:

	June 30, 2020		December 31, 2019
	(in thousands)
Accrued compensation	$	1,009	$	903
Accrued clinical and manufacturing expenses		4,937		3,228
Accrued professional and consulting services		49		2
Reserve for return of royalties		—		178
Other liabilities, current portion		383		254

Total	$	6,378	$	4,565

Note 5 - Revenue	6 Months Ended
Note 5 - Revenue	Jun. 30, 2020
Notes to Financial Statements
Revenue [Text Block]	NOTE 5 . Revenue Service Contracts with Customers Contract Balances. Accounts receivable related to service contracts with customers as of June 30, 2020 and December 31, 2019, was nil and $181,000, respectively. Contract assets, representing unbilled receivables where revenue has been recognized in advance of customer billings, as of June 30, 2020 and December 31, 2019, was $212,000 and $21,000, respectively, which is included in prepaid expenses and other current assets. Remaining Performance Obligations. Remaining Performance Obligations (“RPO”) comprise deferred revenue plus unbilled contract revenue. As of June 30, 2020 and December 31, 2019, there was no deferred revenue and the aggregate amount of RPO was $20,000 and $211,000, respectively, all of which was unbilled contract revenue which is not recorded on the balance sheet. We expect 100% of this amount to be recognized as revenue within the next three months. Unbilled contract revenue represents non-cancelable contracts under which the Company has an obligation to perform, for which revenue has not yet been recognized in the financial statements and the fixed amounts billable have not yet been invoiced. Royalty Agreements Aviragen entered into a royalty-generating research and license agreement with GlaxoSmithKline, plc (“GSK”) in 1990 for the development and commercialization of zanamivir, a neuraminidase inhibitor marketed by GSK as Relenza, to treat influenza. Under the agreement, all Relenza patents owned by the Company were exclusively licensed to GSK. All of the Company's Relenza patents have expired, with the last remaining patent expiring in July 2019 in Japan, at which time royalty revenue ceased, although until April 30, 2020, it remained subject to adjustments for sales returns and exchange rate differences. The royalty revenue related to Relenza recognized in the three months ended June 30, 2020 and 2019, was $193,000 and $69,000, respectively, and in the six months ended June 30, 2020 and 2019, was $193,000 and $764,000, respectively, representing 7% of net sales in Japan. The Company also generates royalty revenue from the sale of Inavir in Japan, pursuant to a collaboration and license agreement that Aviragen entered into with Daiichi Sankyo Company, Limited (“Daiichi Sankyo”) in 2009. In September 2010, laninamivir octanoate was approved for sale by the Japanese Ministry of Health and Welfare for the treatment of influenza in adults and children, which Daiichi Sankyo markets as Inavir. Under the agreement, the Company currently receives a 4% royalty on net sales of Inavir in Japan. The last patent related to Inavir is set to expire in December 2029, at which time royalty revenue will cease. The royalty revenue related to Inavir recognized in the six months ended June 30, 2020 and 2019, was $2,769,000 and $2,964,000, respectively, representing 4% of net sales in Japan. In addition, the Company recognized non-cash royalty revenue related to the sale of future royalties (see Note 6 ) of $238,000 and $16,000 in the three months ended June 30, 2020 and 2019, respectively, and $272,000 and $1,764,000 in the six months ended June 30, 2020 and 2019, respectively. Both the royalty revenue and the non-cash royalty revenue related to sale of future royalties have been subjected to a 5% withholding tax in Japan, for which $12,000 and $1,000 was included in income tax expense in the three months ended June 30, 2020 and 2019, respectively, and $152,000 and $237,000 was included in income tax expense in the six months ended June 30, 2020 and 2019, respectively. The Company's royalty revenue is seasonal, in line with the flu season, so the majority of the Company's royalty revenue is earned in the first and fourth fiscal quarters.

Note 6 - Liabilities Related to Sale of Future Royalties

6 Months Ended

Jun. 30, 2020

Notes to Financial Statements

NOTE

Liabilities Related to Sale of Future Royalties

April 2016,

Aviragen entered into a Royalty Interest Acquisition Agreement (the “RIAA”) with HealthCare Royalty Partners III, L.P. (“HCRP”). Under the RIAA, HCRP made a

$20.0

million cash payment to Aviragen in consideration for acquiring certain royalty rights (“Royalty Rights”) related to the approved product Inavir in the Japanese market. The Royalty Rights were obtained pursuant to the collaboration and license agreements (the “License Agreement”) and a commercialization agreement that the Company entered into with Daiichi Sankyo. Per the terms of the RIAA, HCRP is entitled to the

first

$3.0

million plus

15%

of the next

$1.0

million in royalties earned in each year commencing on

April 1,

with any excess revenue being retained by the Company.

Under the relevant accounting guidance, due to a limit on the amount of royalties that HCRP can earn under the RIAA, this transaction is accounted for as a liability that is being amortized using the interest method over the life of the arrangement. The Company has

obligation to pay any amounts to HCRP other than to pass through to HCRP its share of royalties as they are received from Daiichi Sankyo. In order to record the amortization of the liability, the Company is required to estimate the total amount of future royalty payments to be received under the License Agreement and the payments that will be passed through to HCRP over the life of this agreement. Consequently, the Company imputes interest on the unamortized portion of the liability and records non-cash interest expense using an estimated effective interest rate. The royalties earned in each period that will be passed through to HCRP are recorded as non-cash royalty revenue related to sale of future royalties, with any excess

not

subject to pass-through being recorded as royalty revenue. When the pass-through royalties are paid to HCRP in the following quarter, the imputed liability related to sale of future royalties is commensurately reduced. The Company periodically assesses the expected royalty payments, and to the extent such payments are greater or less than the initial estimate, the Company adjusts the amortization of the liability and interest rate. As a result of this accounting, even though the Company does

not

retain HCRP's share of the royalties, it will continue to record non-cash revenue related to those royalties until the amount of the associated liability, including the related interest, is fully amortized.

The following table shows the activity within the liability account during the

six

months ended

June 30,

2020

(in thousands):

Total liability related to sale of future royalties, start of period	$	16,332
Non-cash royalty revenue paid to HCRP		(2,800	)
Non-cash interest expense recognized		937
Total liability related to sale of future royalties, end of period		14,469
Current portion		(3,150	)
Long-term portion	$	11,319

Note 7 - Leases

6 Months Ended

Jun. 30, 2020

Notes to Financial Statements

Lessee, Operating Leases [Text Block]

NOTE

Leas

The Company has obtained the right of use for office and manufacturing facilities under

four

operating lease agreements,

one

of which has been subleased, and for equipment under an operating lease agreement with an initial term exceeding

one

year, and under

three

operating lease agreements with initial terms of

one

year or less.

The Company obtained the right of use of real estate located in South San Francisco, California, in

June 2015

that was scheduled to terminate on

April 30, 2020,

with a

five

-year extension option that the Company exercised in

July 2019,

extending the lease until

April 30, 2025.

The right of use of these premises was assessed as partially impaired as of

December 31, 2019 (

see Note

). The Company also obtained, via the Merger in

February 2018,

the right of use of facilities located in Alpharetta, Georgia, that terminates on

February 28, 2021,

with

extension option. These facilities were subleased for the remainder of the lease term effective

November 30, 2018.

In addition, the Company has the right of use of

two

facilities located in South San Francisco, California, under leases that terminate on

July 31, 2021,

with

extension options, and the right of use of equipment under a lease that terminates in

September 2021.

As of

June 30, 2020,

the weighted average discount rate for operating leases with initial terms of more than

one

year was

10.53%

and the weighted average remaining term of these leases was

3.55

years. Discount rates were determined using the Company's marginal rate of borrowing at the time each lease was executed or extended.

The following table summarizes the Company's undiscounted cash payment obligations for its operating lease liabilities with initial terms of more than

twelve

months as of

June 30, 2020 (

in thousands):

Year Ending December 31,
2020 (excluding the six months ended June 30, 2020)	$	526
2021		620
2022		336
2023		348
2024		360
Thereafter		122
Undiscounted total		2,312
Less: imputed interest		(388	)
Present value of future minimum payments		1,924
Current portion of operating lease liability		(804	)
Operating lease liability, net of current portion	$	1,120

The Company presently has

finance leases and

future obligations under operating leases for equipment with initial terms of

one

year or less.

Certain operating lease agreements for facilities include non-lease costs, such as common area maintenance, which are recorded as variable lease costs. Operating lease expenses for the

three

and

six

months ended

June 30, 2020

and

2019,

are summarized as follows:

	Three Months Ended June 30,						Six Months Ended June 30,
	2020			2019			2020			2019
Lease cost	(in thousands)						(in thousands)
Operating lease cost	$	212		$	222		$	401		$	445
Short-term lease cost		3			4			6			7
Variable lease cost		13			40			24			88
Sublease income		(55	)		(55	)		(109	)		(109	)
Total lease cost	$	173		$	211		$	322		$	431

Net cash outflows associated with operating leases totaled

$237,000

and

$240,000

in the

three

months ended

June 30, 2020

and

2019,

respectively, and

$474,000

and

$487,000

in the

six

months ended

June 30, 2020

and

2019,

respectively.

Note 8 - Secured Promissory Note Payable to Oxford Finance	6 Months Ended
	Jun. 30, 2020
Notes to Financial Statements
Secured Promissory Note Payable [Text Block]	NOTE 8 . Secured Promissory Note Payable to Oxford Finance On December 22, 2016, the Company entered into a loan and security agreement (the “Loan Agreement”) with Oxford Finance, under which the Company borrowed $5.0 million. The $5.0 million loan, which bore interest at the 30 -day U.S. LIBOR plus 6.17%, was evidenced by a secured promissory note and was repayable over four years, with interest only payable over the first 12 months and the balance fully amortized over the subsequent 36 months. Upon repayment, an additional final payment equal to $325,000 was due, which was accreted as interest expense over the term of the loan using the effective-interest method. The loan was secured by substantially all the Company's assets, except for intellectual property. The annual effective interest rate of the note, including the accretion of the final payment and the amortization of the debt discount, was approximately 10.5%. The Company recorded interest expense related to the Loan Agreement of $96,000 and $202,000 during the three and six months ended June 30, 2019, respectively, of which $64,000 and $136,000, respectively, was paid. The note was repaid in full on November 4, 2019.

Note 9 - Commitments and Contingencies

6 Months Ended

Jun. 30, 2020

Notes to Financial Statements

Commitments and Contingencies Disclosure [Text Block]

NOTE

. Commitments and Contingencies

(a)

Leases

The Company's lease commitments are detailed in Note

(b)

Indemnifications

In the ordinary course of business, the Company enters into agreements that

may

include indemnification provisions. Pursuant to such agreements, the Company

may

indemnify, hold harmless and defend indemnified parties for losses suffered or incurred by the indemnified party. Some of the provisions will limit losses to those arising from

third

-party actions. In some cases, the indemnification will continue after the termination of the agreement. The maximum potential amount of future payments the Company could be required to make under these provisions is

not

determinable. The Company has never incurred material costs to defend lawsuits or settle claims related to these indemnification provisions. The Company has also entered into indemnification agreements with its directors and officers that

may

require the Company to indemnify its directors and officers against liabilities that

may

arise by reason of their status or service as directors or officers to the fullest extent permitted by Delaware corporate law. The Company currently has directors' and officers' insurance.

(c)

Litigation

From time to time the Company

may

be involved in legal proceedings arising in connection with its business. Based on information currently available, the Company believes that the amount, or range, of reasonably possible losses in connection with any pending actions against it in excess of established reserves, in the aggregate, is

not

material to its consolidated financial condition or cash flows. However, any current or future dispute resolution or legal proceeding, regardless of the merits of any such proceeding, could result in substantial costs and a diversion of management's attention and resources that are needed to successfully run our business, and could have a material adverse impact on our business, financial condition and results of operations.

August 4, 2020,

a purported shareholder derivative complaint was filed in the Superior Court of California, San Mateo County, entitled Godfrey v. Latour, et al. The complaint names Vaxart's officers and directors as defendants, asserting claims against them for breach of fiduciary duty, unjust enrichment, and waste and seeking, among other things, an award of damages and attorneys' fees and costs. The complaint also asserts a claim for aiding and abetting breach of fiduciary duty against Armistice Capital, LLC (“Armistice”). The claims are based on allegations that certain stock options issued to the Company's officers and directors between

June 8, 2020

and

June 15, 2020

were manipulated and that certain warrants held by Armistice were amended on

June 8, 2020

for

consideration. The complaint purports to bring the lawsuit on behalf of and for the benefit of the Company and names Vaxart as a “nominal defendant” against which

damages are sought. The Company believes that the allegations in the complaint are without merit. As of the time of this filing, the Company has

not

been served with the complaint.

Note 10 - Stockholders' Equity

6 Months Ended

Jun. 30, 2020

Notes to Financial Statements

Stockholders' Equity Note Disclosure [Text Block]

NOTE

. Stock

holders' Equity

(a)

referred Stock

The Company is authorized to issue

5,000,000

shares of preferred stock,

$0.0001

par value per share. The Company's board of directors

may,

without further action by the stockholders, fix the rights, preferences, privileges and restrictions of up to an aggregate of

5,000,000

shares of preferred stock in

one

or more series and authorize their issuance. These rights, preferences and privileges could include dividend rights, conversion rights, voting rights, terms of redemption, liquidation preferences, sinking fund terms and the number of shares constituting any series or the designation of such series, any or all of which

may

be greater than the rights of the Company's common stock. The issuance of preferred stock could adversely affect the voting power of holders of common stock and the likelihood that such holders will receive dividend payments and payments upon liquidation. In addition, the issuance of preferred stock could have the effect of delaying, deterring or preventing a change of control or other corporate action.

shares of preferred stock are currently outstanding, and we have

present plan to issue any shares of preferred stock.

(b)

Common Stock

At the Company's annual meeting of stockholders held on

June 8, 2020,

the Company's shareholders approved an amendment to the Company's certificate of incorporation to increase the authorized number of shares of common stock from

100,000,000

shares to

150,000,000

shares and decrease the par value of the Company's capital stock from

$0.10

$0.0001.

June 8, 2020,

the Company filed a Certificate of Amendment with the Secretary of State of the State of Delaware to effect the amendment.

Except as otherwise required by law or as otherwise provided in any certificate of designation for any series of preferred stock, the holders of common stock possess all voting power for the election of the Company's directors and all other matters requiring stockholder action. Holders of common stock are entitled to

one

vote per share on matters to be voted on by stockholders. Holders of common stock are entitled to receive such dividends, if any, as

may

be declared from time to time by the Company's board of directors in its discretion out of funds legally available therefore. In

event will any stock dividends or stock splits or combinations of stock be declared or made on common stock unless the shares of common stock at the time outstanding are treated equally and identically. As of

June 30, 2020,

dividends had been declared by the board of directors.

In the event of the Company's voluntary or involuntary liquidation, dissolution, distribution of assets or winding-up, the holders of the common stock will be entitled to receive an equal amount per share of all of the Company's assets of whatever kind available for distribution to stockholders, after the rights of the holders of the preferred stock have been satisfied. There are

sinking fund provisions applicable to the common stock.

The Company had shares of common stock reserved for issuance as follows:

	June 30, 2020		December 31, 2019

Options issued and outstanding		6,382,232		1,811,652
PRSUs issued and outstanding		411,000		—
Available for future grants of equity awards		1,620,028		295,180
Common stock warrants		1,942,654		43,370,162
Total		10,355,914		45,476,994

(c)

Warrants

The following warrants were outstanding as of

June 30, 2020

, all of which contain standard anti-dilution protections in the event of subsequent rights offerings, stock splits, stock dividends or other extraordinary dividends, or other similar changes in the Company's common stock or capital structure, and

none

of which have any participating rights for any losses:

Securities into which warrants are convertible	Warrants outstanding	Exercise Price		Expiration Date

Common Stock	171,667	$	0.30	September 2024
Common Stock	241,169	$	0.375	September 2024
Common Stock	225,966	$	1.10	April 2024
Common Stock	163,068	$	1.375	April 2024
Common Stock	766,584	$	2.50	March 2025
Common Stock	280,000	$	3.125	February 2025
Common Stock	83,286	$	3.125	March 2024
Common Stock	10,914	$	22.99	December 2026
Total	1,942,654

The

280,000

common stock warrants issued to placement agents' designees at the closing of the

March 2020

Offering (see Note

) each entitle the holder to purchase

one

share of common stock for

$3.125

at any time within

five

years of

February 27, 2020,

the effective date of the

March 2020

Offering. The aggregate fair value of these warrants at issuance was estimated to be

$453,000,

using the Black-Scholes valuation model, using a closing stock price of

$2.34

and assumptions including estimated volatility of

98%,

a risk-free interest rate of

0.88%,

zero

dividend rate and an estimated remaining term of

4.99

years.

In the event of a Fundamental Transaction (a transfer of ownership of the Company as defined in the warrant) within the Company's control, the holders of the unexercised common stock warrants exercisable for

$0.30,

$0.375,

$1.10

and

$2.50

and those exercisable for

$3.125

expiring in

February 2025

shall be entitled to receive cash consideration equal to a Black-Scholes valuation, as defined in the warrant. If such Fundamental Transaction is

not

within the Company's control, the warrantholders would only be entitled to receive the same form of consideration (and in the same proportion) as the holders of the Company's common stock, hence these warrants are classified as a component of permanent equity.

Note 11 - Equity Incentive Plans

6 Months Ended

Jun. 30, 2020

Notes to Financial Statements

Share-based Payment Arrangement [Text Block]

NOTE

Equity Incentive Plan

April 23, 2019,

the Company's stockholders approved the adoption of the

2019

Equity Incentive Plan (the

“2019

Plan”), under which the Company is authorized to issue ISOs, NQSOs, stock appreciation rights, RSAs, RSUs, other stock awards and performance awards that

may

be settled in cash, stock, or other property. The

2019

Plan is designed to secure and retain the services of employees, directors and consultants, provide incentives for the Company's employees, directors and consultants to exert maximum efforts for the success of the Company and its affiliates, and provide a means by which employees, directors and consultants

may

be given an opportunity to benefit from increases in the value of the Company's common stock. Following adoption of the

2019

Plan, all previous plans were frozen, and on forfeiture, cancellation and expiration, awards under those plans are

not

assumed by the

2019

Plan.

The aggregate number of shares of common stock authorized for issuance under the

2019

Plan was initially

1,600,000

shares, which was increased through an amendment to the

2019

Plan adopted by the Company's stockholders on

June 8, 2020,

8,000,000

(the “Plan Amendment”), subject to standard adjustments in the event of a stock split, stock dividend or other extraordinary dividend, or other similar change in the Company's common stock or capital structure. Further amendments to the

2019

Plan to increase the share reserve would require stockholder approval. Awards that expire or are canceled generally become available for issuance again under the

2019

Plan. Awards have a maximum term of

ten

years from the grant date and

may

vest over varying periods, as specified by the Company's board of directors for each grant.

March 2020,

the Company granted

411,000

performance-based restricted stock unit (“PRSU”) awards to employees which vest upon the achievement of certain performance conditions, subject to each employee's continued service relationship with the Company. As of

June 30, 2020,

all of these

411,000

PRSUs were outstanding. The related compensation cost, which is based on the grant date fair value of the Company's common stock multiplied by the number of PRSUs granted, is recognized as an expense ratably over the estimated vesting period when achievement of the performance condition is considered probable. Based on the Company's evaluation of the probability of achieving the performance condition as of

June 30, 2020,

the Company recognized

$531,000

of related expense during the

three

and

six

months ended

June

30,

2020.

A summary of stock option transactions in the

six

months ended

June 30, 2020,

is as follows:

							Weighted
	Shares			Number of			Average
	Available			Options			Exercise
	For Grant			Outstanding			Price

Balance at January 1, 2020		295,180			1,811,652		$	2.74
2019 Plan Amendment		6,400,000
PRSUs granted, net of tax forfeitures		(278,535	)		—		$	—
Granted		(4,892,100	)		4,892,100		$	2.04
Exercised		—			(178,381	)	$	0.65
Forfeited		85,910			(85,992	)	$	0.39
Canceled		9,573			(57,147	)	$	10.50

Balance at June 30, 2020		1,620,028			6,382,232		$	2.22

As of

June 30, 2020,

there were

6,382,232

options outstanding with a weighted average exercise price of

$2.22,

a weighted average remaining term of

9.37

years and an aggregate intrinsic value of

$43.1

million. Of these options,

1,431,750

were vested, with a weighted average exercise price of

$3.22,

a weighted average remaining term of

8.31

years and an aggregate intrinsic value of

$8.8

million. The Company received

$116,000

for the

178,381

options exercised during the

six

months ended

June 30, 2020,

which had an intrinsic value of

$524,000.

options were exercised during the

six

months ended

June 30, 2019.

March 24, 2020,

the board of directors of the Company approved the grant of an aggregate of

2,610,000

options with an exercise price of

$1.70

per share (the closing price of the Company's common stock on

March 24, 2020) (

the

“March

Option Awards”), which vests as to

25%

of the underlying shares of common stock on the date of grant and thereafter in

twenty-four

(

) equal monthly installments thereafter; provided that the stock options were

not

exercisable until the approval by the stockholders of an amendment to the

2019

Plan. On

June 8, 2020,

the stockholders approved the Plan Amendment and at such time the

March

Option Awards became exercisable, subject to the vesting schedule noted previously.

June 15, 2020,

the Company awarded

900,000

performance-based options and

845,280

time-based options with an exercise price of

$2.46

per share (the closing price of the Company's common stock on the grant date) to its new Chief Executive Officer. Vesting of the time-based options will be as follows:

25%

on the

first

anniversary of the Grant Date and

75%

in equal monthly installments over the

three

-year period commencing on such

first

anniversary, with accelerated vesting with respect to

50%

of any then-unvested option shares upon a substantial strategic agreement, as determined by the Board, and with accelerated vesting in full in the event of a “Change in Control” (as defined under the

2019

Plan).

Vesting of the performance-based options would occur if the Company achieved a specified closing price during any

ten

consecutive trading days by

November 30, 2020,

with

one

third

based on a closing price of

$5.00,

one

third

based on a closing price of

$7.50

and

one

third

based on a closing price of

$10.00,

subject to continuing employment. Utilizing a Monte Carlo Simulation and assumptions of the fair value of Common Stock of

$2.46,

estimated volatility of

105%,

a risk-free interest rate of

0.35%,

zero

dividend rate and an expected term of

5.23

years, the Company determined the weighted average fair value of these options on the issuance date to be

$0.31

per share, or

$279,000,

which was initially being expensed over the estimated vesting term, assuming vesting occurs by

November 30, 2020,

for each tranche.

The tranches based on closing prices of

$5.00,

$7.50

and

$10.00

vested on

July 9, 2020,

July 20, 2020

and

July 24, 2020,

respectively, so the unamortized balance of

$242,000

will be expensed in the

three

months ending

September 30, 2020.

The weighted average grant date fair value of all other options awarded in the

six

months ended

June 30,

2020

and

2019,

was

$1.92

and

$0.55,

respectively. Fair values were estimated using the following assumptions:

	Six Months Ended June 30,
	2020	2019

Risk-free interest rate	0.44% - 0.88%	1.89% - 2.31%
Expected term	5.22 - 10.00 Years	5.39 - 6.08 Years
Expected volatility	94% - 104%	83% - 85%
Dividend yield	—%	—%

The Company measures the fair value of all stock-based awards on the grant date and records the fair value of these awards, net of estimated forfeitures, to compensation expense over the service period. Total stock-based compensation recognized for options and PRSUs was as follows:

	Three Months Ended June 30,				Six Months Ended June 30,
	2020		2019		2020		2019
	(in thousands)				(in thousands)
Research and development	$	1,115	$	80	$	1,137	$	159
General and administrative		1,745		100		1,819		185
Total stock-based compensation	$	2,860	$	180	$	2,956	$	344

As of

June 30, 2020,

the unrecognized stock-based compensation cost related to outstanding unvested stock options and PRSUs that are expected to vest was

$5.9

million, which the Company expects to recognize over an estimated weighted average period of

2.21

years.

Note 12 - Related Party Transaction	6 Months Ended
Note 12 - Related Party Transaction	Jun. 30, 2020
Notes to Financial Statements
Related Party Transactions Disclosure [Text Block]	NOTE 12. Related Party Transaction In April 2020 the Company recorded a net amount of $652,000 related to the disgorgement of stockholder short-swing profits under Section 16 (b) of the Securities Exchange Act of 1934, as amended. The Company recognized these related party proceeds as an increase to contributed capital on the condensed consolidated balance sheet.

Note 13 - Net Loss Per Share

6 Months Ended

Jun. 30, 2020

Notes to Financial Statements

Earnings Per Share [Text Block]

NOTE

. Net Loss

Per Share

The following table presents the calculation of basic and diluted net loss per share (in thousands, except share and per share amounts):

	Three Months Ended June 30,						Three Months Ended June 30,
	2020			2019			2020			2019

Net loss	$	(8,977	)	$	(5,637	)	$	(10,274	)	$	(6,976	)

Shares used to compute net loss per share – basic and diluted		74,675,131			14,597,446			67,676,138			10,969,473

Net loss per share – basic and diluted	$	(0.12	)	$	(0.39	)	$	(0.15	)	$	(0.64	)

adjustment has been made to the net loss in the

three

and

six

months ended

June 30,

2020

2019

, as the effect would be anti-dilutive due to the net loss.

The following potentially dilutive securities were excluded from the computation of diluted weighted average shares outstanding because they would have been antidilutive:

	Three Months Ended June 30,		Six Months Ended June 30,
	2020	2019	2020	2019

Options to purchase common stock	2,654,144	1,561,067	2,216,462	1,212,654

PRSUs	411,000	—	223,566	—

Warrants to purchase common stock	23,522,891	11,802,695	28,729,806	5,944,948

Total potentially dilutive securities excluded from denominator of the diluted earnings per share computation	26,588,035	13,363,762	31,169,834	7,157,602

Note 14 - Restructuring Costs

6 Months Ended

Jun. 30, 2020

Notes to Financial Statements

Restructuring and Related Activities Disclosure [Text Block]

NOTE

Restructuring Costs

Restructuring liabilities primarily consist of the estimated future obligations for contract suspension costs. These restructuring liabilities, all of which are expected to be paid in the year ending

December 31, 2020,

are recorded in other accrued liabilities in the condensed consolidated balance sheets.

The Company approved a reduction-in-force during the year ended

December 31, 2019,

for which it accrued severance and benefits charges, all of which were paid in the

three

months ended

March 31, 2020.

The Company also accrued the maximum amount potentially payable under a manufacturing work order which it suspended, recorded impairment charges against property and equipment and right-of-use assets formerly used for manufacturing covering the period in which

benefits were expected to be derived, and incurred legal fees and accretion costs in connection with the restructuring. The Company recorded costs in the

six

months ended

June 30, 2020,

for legal fees and for accretion related to the manufacturing premises and expects to record further charges in

2020

for legal fees, broker commissions and accretion and, potentially, further impairment of a right-of-use asset if it is unable to sublease the manufacturing premises, which it is presently using again for a short-term manufacturing project and recording such cost as research and development expense, for as much as it is presently paying, or if subleasing takes longer than expected. The Company has

not

agreed to pay the full amount accrued with respect to the suspended manufacturing work order and expects to reverse part of the related charge following negotiations with the vendor.

Cumulative restructuring costs incurred and a reconciliation of the change in related liabilities during the

six

months ended

June 30,

2020

, is as follows:

	Suspension		Severance			Impairment
	of Contract		Benefits			Charges		Other			Total
	(in thousands)

Cumulative cost incurred as of June 30, 2020	$	3,223	$	368		$	1,272	$	160		$	5,023

Reconciliation of liabilities:
Balance at December 31, 2019	$	3,223	$	368		$	—	$	57		$	3,648
Period charges		—		—			—		103			103
Payments and settlements		—		(368	)		—		(150	)		(518	)
Balance at June 30, 2020	$	3,223	$	—		$	—	$	10		$	3,233

Note 15 - Subsequent Events	6 Months Ended
Note 15 - Subsequent Events	Jun. 30, 2020
Notes to Financial Statements
Subsequent Events [Text Block]	NOTE 15 . Subsequent Events On July 13, 2020, the Company completed the sale of 12,503,806 shares for gross proceeds of approximately $100 million from an at-the-market facility (the “ATM Program”) under a sales prospectus agreement dated July 8, 2020. After deducting sales commissions and expenses, net cash proceeds under the ATM Program were approximately $97 million. Since June 30, 2020, the Company has issued 531,013 shares of common stock upon the exercise of warrants for cash proceeds totaling $1.2 million.

Significant Accounting Policies (Policies)	6 Months Ended
Significant Accounting Policies (Policies)	Jun. 30, 2020
Accounting Policies [Abstract]
Basis of Accounting, Policy [Policy Text Block]	Basis of Presentation – The Company has prepared the accompanying condensed consolidated financial statements pursuant to the rules and regulations of the Securities and Exchange Commission (“SEC”). Certain information and footnote disclosures normally included in consolidated financial statements prepared in accordance with accounting principles generally accepted in the United States of America (“U.S. GAAP”) have been condensed or omitted pursuant to these rules and regulations. These condensed consolidated financial statements should be read in conjunction with the Company's audited financial statements and footnotes related thereto for the year ended December 31, 2019, included in the Company's Annual Report on Form 10 -K filed with the SEC on March 19, 2020 ( the “Annual Report”). Except as noted below, there have been no material changes to the Company's significant accounting policies described in Note 2 to the consolidated financial statements included in the Annual Report. In the opinion of management, the unaudited condensed consolidated financial statements include all adjustments (consisting only of normal recurring adjustments) necessary to present fairly the Company's financial position and the results of its operations and cash flows. The results of operations for such interim periods are not necessarily indicative of the results to be expected for the full year.
Consolidation, Policy [Policy Text Block]	Basis of Consolidation – The condensed consolidated financial statements include the financial statements of Vaxart, Inc. and its subsidiaries. All significant transactions and balances between Vaxart, Inc. and its subsidiaries have been eliminated in consolidation.
Use of Estimates, Policy [Policy Text Block]	Use of Estimates – The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets, liabilities, revenues and expenses and disclosure of contingent assets and liabilities in the financial statements and accompanying notes. Actual results and outcomes could differ from these estimates and assumptions.
Concentration Risk, Credit Risk, Policy [Policy Text Block]	Concentration of Credit Risk – Financial instruments that potentially subject the Company to significant concentrations of credit risk consist principally of cash, cash equivalents and accounts receivable. The Company places its cash and cash equivalents at financial institutions that management believes are of high credit quality. The Company is exposed to credit risk in the event of default by the financial institutions holding the cash and cash equivalents to the extent such amounts are in excess of the federally insured limits. The Company has not experienced any losses on its deposits since inception. The primary focus of the Company's investment strategy is to preserve capital and meet liquidity requirements. The Company's investment policy addresses the level of credit exposure by limiting the concentration in any one corporate issuer or sector and establishing a minimum allowable credit rating. The Company generally requires no collateral from its customers.
Reclassification, Comparability Adjustment [Policy Text Block]	Reclassification – Prior periods' data is subject to reclassification to conform to the current presentation. Accordingly, $40,000 and $88,000 that were previously recorded as non-lease costs have been included as variable lease costs and in cash outflows related to leases in the three and six months ended June 30, 2019, respectively. This reclassification had no effect on reported net loss.
New Accounting Pronouncements, Policy [Policy Text Block]	Recent Accounting Pronouncements The Company believes that the impact of accounting standards updates recently issued that are not yet effective will not have a material impact on its financial position or results of operations upon adoption.

Note 4 - Balance Sheet Components (Tables)

6 Months Ended

Jun. 30, 2020

Notes Tables

Schedule of Cash and Cash Equivalents [Table Text Block]

	June 30, 2020		December 31, 2019
	(in thousands)
Cash at banks	$	44,388	$	13,511
Money market funds		—		15
Total cash and cash equivalents	$	44,388	$	13,526

Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]

	June 30, 2020		December 31, 2019
	(in thousands)
Royalties receivable	$	227	$	3,438
Customer service contracts - billed		—		181
Accounts receivable	$	227	$	3,619

Property, Plant and Equipment [Table Text Block]

	June 30, 2020			December 31, 2019
	(in thousands)
Laboratory equipment	$	706		$	537
Office and computer equipment		142			132
Total property and equipment		848			669
Less: accumulated depreciation		(503	)		(459	)
Property and equipment, net	$	345		$	210

Lessee, Operating Lease, Right-of-Use Assets [Table Text Block]

	June 30, 2020		December 31, 2019
	(in thousands)
Facilities	$	1,751	$	1,985
Office equipment		4		5
Right-of-use assets, net	$	1,755	$	1,990

Schedule of Finite-Lived Intangible Assets [Table Text Block]

	June 30, 2020			December 31, 2019
	(in thousands)
Purchased technology	$	22,100		$	22,100
Intellectual property		80			80
Total cost		22,180			22,180
Less: accumulated amortization		(5,953	)		(5,087	)
Intangible assets, net	$	16,227		$	17,093

Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]

Year Ending December 31,	Amount
2020 (six months remaining)	$	866
2021		1,732
2022		1,731
2023		1,732
2024		1,732
Thereafter		8,434
Total	$	16,227

Schedule of Accrued Liabilities [Table Text Block]

	June 30, 2020		December 31, 2019
	(in thousands)
Accrued compensation	$	1,009	$	903
Accrued clinical and manufacturing expenses		4,937		3,228
Accrued professional and consulting services		49		2
Reserve for return of royalties		—		178
Other liabilities, current portion		383		254

Total	$	6,378	$	4,565

Note 6 - Liabilities Related to Sale of Future Royalties (Tables)

6 Months Ended

Jun. 30, 2020

Notes Tables

Deferred Revenue, by Arrangement, Disclosure [Table Text Block]

Total liability related to sale of future royalties, start of period	$	16,332
Non-cash royalty revenue paid to HCRP		(2,800	)
Non-cash interest expense recognized		937
Total liability related to sale of future royalties, end of period		14,469
Current portion		(3,150	)
Long-term portion	$	11,319

Note 7 - Leases (Tables)

6 Months Ended

Jun. 30, 2020

Notes Tables

Lessee, Operating Lease, Liability, Maturity [Table Text Block]

Year Ending December 31,
2020 (excluding the six months ended June 30, 2020)	$	526
2021		620
2022		336
2023		348
2024		360
Thereafter		122
Undiscounted total		2,312
Less: imputed interest		(388	)
Present value of future minimum payments		1,924
Current portion of operating lease liability		(804	)
Operating lease liability, net of current portion	$	1,120

Lease, Cost [Table Text Block]

	Three Months Ended June 30,						Six Months Ended June 30,
	2020			2019			2020			2019
Lease cost	(in thousands)						(in thousands)
Operating lease cost	$	212		$	222		$	401		$	445
Short-term lease cost		3			4			6			7
Variable lease cost		13			40			24			88
Sublease income		(55	)		(55	)		(109	)		(109	)
Total lease cost	$	173		$	211		$	322		$	431

Note 10 - Stockholders' Equity (Tables)

6 Months Ended

Jun. 30, 2020

Notes Tables

Schedule of Common Stock Reserved for Issuance [Table Text Block]

	June 30, 2020		December 31, 2019

Options issued and outstanding		6,382,232		1,811,652
PRSUs issued and outstanding		411,000		—
Available for future grants of equity awards		1,620,028		295,180
Common stock warrants		1,942,654		43,370,162
Total		10,355,914		45,476,994

Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block]

Securities into which warrants are convertible	Warrants outstanding	Exercise Price		Expiration Date

Common Stock	171,667	$	0.30	September 2024
Common Stock	241,169	$	0.375	September 2024
Common Stock	225,966	$	1.10	April 2024
Common Stock	163,068	$	1.375	April 2024
Common Stock	766,584	$	2.50	March 2025
Common Stock	280,000	$	3.125	February 2025
Common Stock	83,286	$	3.125	March 2024
Common Stock	10,914	$	22.99	December 2026
Total	1,942,654

Note 11 - Equity Incentive Plans (Tables)

6 Months Ended

Jun. 30, 2020

Notes Tables

Share-based Payment Arrangement, Option, Activity [Table Text Block]

							Weighted
	Shares			Number of			Average
	Available			Options			Exercise
	For Grant			Outstanding			Price

Balance at January 1, 2020		295,180			1,811,652		$	2.74
2019 Plan Amendment		6,400,000
PRSUs granted, net of tax forfeitures		(278,535	)		—		$	—
Granted		(4,892,100	)		4,892,100		$	2.04
Exercised		—			(178,381	)	$	0.65
Forfeited		85,910			(85,992	)	$	0.39
Canceled		9,573			(57,147	)	$	10.50

Balance at June 30, 2020		1,620,028			6,382,232		$	2.22

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]

	Six Months Ended June 30,
	2020	2019

Risk-free interest rate	0.44% - 0.88%	1.89% - 2.31%
Expected term	5.22 - 10.00 Years	5.39 - 6.08 Years
Expected volatility	94% - 104%	83% - 85%
Dividend yield	—%	—%

Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block]

	Three Months Ended June 30,				Six Months Ended June 30,
	2020		2019		2020		2019
	(in thousands)				(in thousands)
Research and development	$	1,115	$	80	$	1,137	$	159
General and administrative		1,745		100		1,819		185
Total stock-based compensation	$	2,860	$	180	$	2,956	$	344

Note 13 - Net Loss Per Share (Tables)

6 Months Ended

Jun. 30, 2020

Notes Tables

Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]

	Three Months Ended June 30,						Three Months Ended June 30,
	2020			2019			2020			2019

Net loss	$	(8,977	)	$	(5,637	)	$	(10,274	)	$	(6,976	)

Shares used to compute net loss per share – basic and diluted		74,675,131			14,597,446			67,676,138			10,969,473

Net loss per share – basic and diluted	$	(0.12	)	$	(0.39	)	$	(0.15	)	$	(0.64	)

Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]

	Three Months Ended June 30,		Six Months Ended June 30,
	2020	2019	2020	2019

Options to purchase common stock	2,654,144	1,561,067	2,216,462	1,212,654

PRSUs	411,000	—	223,566	—

Warrants to purchase common stock	23,522,891	11,802,695	28,729,806	5,944,948

Total potentially dilutive securities excluded from denominator of the diluted earnings per share computation	26,588,035	13,363,762	31,169,834	7,157,602

Note 14 - Restructuring Costs (Tables)

6 Months Ended

Jun. 30, 2020

Notes Tables

Schedule of Restructuring Reserve by Type of Cost [Table Text Block]

	Suspension		Severance			Impairment
	of Contract		Benefits			Charges		Other			Total
	(in thousands)

Cumulative cost incurred as of June 30, 2020	$	3,223	$	368		$	1,272	$	160		$	5,023

Reconciliation of liabilities:
Balance at December 31, 2019	$	3,223	$	368		$	—	$	57		$	3,648
Period charges		—		—			—		103			103
Payments and settlements		—		(368	)		—		(150	)		(518	)
Balance at June 30, 2020	$	3,223	$	—		$	—	$	10		$	3,233

Note 1 - Organization and Basis of Presentation (Details Textual) - USD ($)	Mar. 02, 2020	Jun. 30, 2020	Jun. 08, 2020	Jun. 07, 2020	Dec. 31, 2019	Feb. 13, 2018
Conversion of Stock, Shares Issued (in shares)						0.22148
Proceeds from Issuance or Sale of Equity, Total	$ 10,000,000
Proceeds from Issuance or Sale of Equity, Net	9,200,000
Payments of Stock Issuance Costs	$ 775,000
Common Stock, Par or Stated Value Per Share (in dollars per share)		$ 0.0001	$ 0.0001	$ 0.10	$ 0.0001
Common Stock, Shares Authorized (in shares)		150,000,000	150,000,000	100,000,000	150,000,000
Preferred Stock, Par or Stated Value Per Share (in dollars per share)		$ 0.0001	$ 0.0001	$ 0.10	$ 0.0001
The March 2020 Offering Warrants [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)	2,000,000
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right (in shares)	1
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)	$ 2.50
Warrants and Rights Outstanding, Term (Year)	5 years
Warrants and Rights Outstanding	$ 453,000
The March 2020 Offering Placement Agent Warrants [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)	280,000
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right (in shares)	1
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)	$ 3.125
Warrants and Rights Outstanding, Term (Year)	5 years
Class of Warrant or Right, Issued During Period (in shares)	280,000
Warrants and Rights Outstanding	$ 453,000
The March 2020 Offering [Member]
Stock Issued During Period, Shares, New Issues (in shares)	4,000,000

Note 2 - Summary of Significant Accounting Policies (Details Textual) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Variable Lease, Cost	$ 13,000	$ 40,000	$ 24,000	$ 88,000
Reclassification from Non-lease Cost [Member]
Variable Lease, Cost		$ 40,000		$ 88,000

Note 3 - Fair Value of Financial Instruments (Details Textual) - Fair Value, Recurring [Member] - USD ($)	Jun. 30, 2020	Dec. 31, 2019	Jun. 30, 2019
Financial Liabilities Fair Value Disclosure, Total	$ 0		$ 0
Money Market Funds [Member]
Cash and Cash Equivalents, Fair Value Disclosure		$ 15,000

Note 4 - Balance Sheet Components (Details Textual) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Accounts Receivable, Allowance for Credit Loss, Current	$ 0		$ 0		$ 0
Depreciation, Total	25,000	$ 125,000	44,000	$ 255,000
Impairment of Property and Equipment			0	0
Amortization of Intangible Assets, Total	$ 433,000	$ 675,000	$ 866,000	$ 1,454,000
Intellectual Property [Member]
Finite-Lived Intangible Asset, Useful Life (Year)			20 years
Finite-Lived Intangible Asset, Remaining Life (Year)			7 years 182 days
Developed Technology Rights [Member]
Finite-Lived Intangible Asset, Remaining Life (Year)			9 years 146 days
Minimum [Member]
Finite-Lived Intangible Asset, Useful Life (Year)			1 year 109 days
Maximum [Member]
Finite-Lived Intangible Asset, Useful Life (Year)			11 years 273 days

Note 4 - Balance Sheet Components - Cash and Cash Equivalents (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019	Jun. 30, 2019	Dec. 31, 2018
Cash at banks	$ 44,388	$ 13,511
Money market funds		15
Total cash and cash equivalents	$ 44,388	$ 13,526	$ 16,258	$ 11,506

Note 4 - Balance Sheet Components - Accounts Receivable, Net of Allowance (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Accounts receivable	$ 227	$ 3,619
Royalty [Member]
Accounts receivable	227	3,438
Customer Service Contracts [Member]
Accounts receivable		$ 181

Note 4 - Balance Sheet Components - Property and Equipment, Net (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Property and equipment, gross	$ 848	$ 669
Less: accumulated depreciation	(503)	(459)
Property and equipment, net	345	210
Laboratory Equipment [Member]
Property and equipment, gross	706	537
Office Equipment [Member]
Property and equipment, gross	$ 142	$ 132

Note 4 - Balance Sheet Components - Right-of-Use Assets, Net (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Right-of-use assets, net	$ 1,755	$ 1,990
Facilities [Member]
Right-of-use assets, net	1,751	1,985
Office Equipment [Member]
Right-of-use assets, net	$ 4	$ 5

Note 4 - Balance Sheet Components - Intangible assets (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Intangible assets, gross	$ 22,180	$ 22,180
Less: accumulated amortization	(5,953)	(5,087)
Intangible assets, net	16,227	17,093
Purchased Technology [Member]
Intangible assets, gross	22,100	22,100
Intellectual Property [Member]
Intangible assets, gross	$ 80	$ 80

Note 4 - Balance Sheet Components - Estimated Future Amortization Expense (Details) $ in Thousands	Jun. 30, 2020 USD ($)
2020 (six months remaining)	$ 866
2021	1,732
2022	1,731
2023	1,732
2024	1,732
Thereafter	8,434
Total	$ 16,227

Note 4 - Balance Sheet Components - Accrued liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Accrued compensation	$ 1,009	$ 903
Accrued clinical and manufacturing expenses	4,937	3,228
Accrued professional and consulting services	49	2
Reserve for return of royalties		178
Other liabilities, current portion	383	254
Total	$ 6,378	$ 4,565

Note 5 - Revenue 1 (Details Textual) - USD ($)	3 Months Ended			6 Months Ended		12 Months Ended
Note 5 - Revenue 1 (Details Textual) - USD ($)	Jun. 30, 2020	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Contract with Customer, Asset, after Allowance for Credit Loss, Current, Total	$ 0			$ 0		$ 181,000
Contract With Customer, Asset, Revenue Recognized	212,000			212,000		21,000
Contract with Customer, Liability, Total	0			0		0
Revenue, Remaining Performance Obligation, Amount	20,000			20,000		$ 211,000
Revenue from Contract with Customer, Including Assessed Tax	523,000	$ 85,000		3,425,000	$ 5,492,000
Income Tax Expense (Benefit), Total	26,000	13,000		$ 179,000	263,000
Foreign Tax Authority [Member] \| National Tax Agency, Japan [Member]
Royalty Withholding Tax				5.00%
Income Tax Expense (Benefit), Total	12,000	1,000		$ 152,000	237,000
Royalty [Member]
Revenue from Contract with Customer, Including Assessed Tax	193,000	69,000		2,962,000	3,728,000
Royalty [Member] \| GSK Research and License Agreement [Member]
Revenue from Contract with Customer, Including Assessed Tax	193,000	69,000		193,000	764,000
Royalty Percentage			7.00%
Royalty [Member] \| Daiichi Sankyo Collaberation and License Agreement [Member]
Revenue from Contract with Customer, Including Assessed Tax				$ 2,769,000	2,964,000
Royalty Percentage				4.00%		4.00%
Non-cash Royalty Revenue, Related to Sale of Future Royalties	$ 238,000	$ 16,000		$ 272,000	$ 1,764,000

Note 5 - Revenue 2 (Details Textual) - Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-07-01	Jun. 30, 2020
Revenue, Remaining Performance Obligation, Percentage	100.00%
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period (Month)	90 days

Note 6 - Liabilities Related to Sale of Future Royalties (Details Textual) - HCRP [Member] $ in Millions	1 Months Ended
	Apr. 30, 2016 USD ($)
Proceeds from Sale of Future Royalties, Net	$ 20
Royalty Interest Due Each Year	$ 3
Royalty Interest, Percentage of Additional Royalties Due Each Year	15.00%
Royalty Interest, Additional Royalties Due Each Year	$ 1

Note 6 - Liabilities Related to Sale of Future Royalties - Deferred Revenue Activity (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Dec. 31, 2019
Current portion	$ (3,150)	$ (2,916)
Long-term portion	11,319	$ 13,416
HealthCare Royalty Partners III, L.P. [Member] \| Royalty Arrangement [Member]
Total liability related to sale of future royalties, start of period	16,332
Non-cash royalty revenue paid to HCRP	(2,800)
Non-cash interest expense recognized	937
Total liability related to sale of future royalties, end of period	14,469
Current portion	(3,150)
Long-term portion	$ 11,319

Note 7 - Leases (Details Textual) - USD ($)	3 Months Ended		6 Months Ended
Note 7 - Leases (Details Textual) - USD ($)	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Lessee, Operating Lease, Number of Right-of-Use Leases	4		4
Lessee, Operating Lease, Number of Right-of-Use Leases, Terminated	1		1
Lessee, Operating Lease, Number of Right-of-Use Leases, Subleased	1		1
Lessee, Operating Lease, Number Leases Exceeding One Year	3		3
Lessee, Operating Lease, Renewal Term (Year)	5 years		5 years
Operating Lease, Weighted Average Discount Rate, Percent	10.53%		10.53%
Operating Lease, Weighted Average Remaining Lease Term (Year)	3 years 200 days		3 years 200 days
Lessee, Finance Lease, Number of Leases	0		0
Short-term Lease Commitment, Amount	$ 0		$ 0
Operating Lease, Payments	$ 237,000	$ 240,000	$ 474,000	$ 487,000

Note 7 - Leases - Lease Liabilities Payment Obligations (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
2020 (excluding the six months ended June 30, 2020)	$ 526
2021	620
2022	336
2023	348
2024	360
Thereafter	122
Undiscounted total	2,312
Less: imputed interest	(388)
Present value of future minimum payments	1,924
Current portion of operating lease liability	(804)	$ (841)
Operating lease liability, net of current portion	$ 1,120	$ 1,472

Note 7 - Leases - Operating Lease Expenses (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Operating lease cost	$ 212	$ 222	$ 401	$ 445
Short-term lease cost	3	4	6	7
Variable lease cost	13	40	24	88
Sublease income	(55)	(55)	(109)	(109)
Total lease cost	$ 173	$ 211	$ 322	$ 431

Note 8 - Secured Promissory Note Payable to Oxford Finance (Details Textual) - Loan Agreement [Member] - Oxford Finance [Member] - USD ($)		3 Months Ended	6 Months Ended
	Dec. 22, 2016	Jun. 30, 2019	Jun. 30, 2019
Long-term Debt, Gross	$ 5,000,000
Debt Instrument, Term (Year)	4 years
Debt Instrument, Periodic Payment Terms, Balloon Payment to be Paid	$ 325,000
Debt Instrument, Interest Rate, Effective Percentage	10.50%
Interest Expense, Debt, Total		$ 96,000	$ 202,000
Interest Paid, Including Capitalized Interest, Operating and Investing Activities, Total		$ 64,000	$ 136,000
London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument, Basis Spread on Variable Rate	6.17%

Note 10 - Stockholders' Equity (Details Textual)	6 Months Ended
Note 10 - Stockholders' Equity (Details Textual)	Jun. 30, 2020 USD ($) $ / shares shares	Jun. 08, 2020 $ / shares shares	Jun. 07, 2020 $ / shares shares	Mar. 02, 2020 USD ($) yr $ / shares shares	Dec. 31, 2019 $ / shares shares
Preferred Stock, Shares Authorized (in shares) \| shares	5,000,000				5,000,000
Preferred Stock, Par or Stated Value Per Share (in dollars per share)	$ 0.0001	$ 0.0001	$ 0.10		$ 0.0001
Preferred Stock, Shares Outstanding, Ending Balance (in shares) \| shares	0				0
Common Stock, Shares Authorized (in shares) \| shares	150,000,000	150,000,000	100,000,000		150,000,000
Common Stock, Par or Stated Value Per Share (in dollars per share)	$ 0.0001	$ 0.0001	$ 0.10		$ 0.0001
Dividends, Total \| $	$ 0
The March 2020 Offering Placement Agent Warrants [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) \| shares				280,000
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right (in shares) \| shares				1
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)				$ 3.125
Warrants and Rights Outstanding, Term (Year)				5 years
Warrants and Rights Outstanding \| $				$ 453,000
The March 2020 Offering Placement Agent Warrants [Member] \| Measurement Input, Share Price [Member]
Warrants and Rights Outstanding, Measurement Input				2.34
The March 2020 Offering Placement Agent Warrants [Member] \| Measurement Input, Price Volatility [Member]
Warrants and Rights Outstanding, Measurement Input				0.98
The March 2020 Offering Placement Agent Warrants [Member] \| Measurement Input, Risk Free Interest Rate [Member]
Warrants and Rights Outstanding, Measurement Input				0.0088
The March 2020 Offering Placement Agent Warrants [Member] \| Measurement Input, Discount Rate [Member]
Warrants and Rights Outstanding, Measurement Input				0
The March 2020 Offering Placement Agent Warrants [Member] \| Measurement Input, Expected Term [Member]
Warrants and Rights Outstanding, Measurement Input \| yr				4.99
First Set of Warrants Expiring September 2024 [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)	$ 0.30
Warrant Exercise Price to be Entitled to Receive Cash Consideration, Fundamental Transaction (in dollars per share)	0.30
Second Set of Warrants Expiring April 2024 [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)	1.375
Warrant Exercise Price to be Entitled to Receive Cash Consideration, Fundamental Transaction (in dollars per share)	0.375
First Set of Warrants Expiring April 2024 [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)	1.10
Warrant Exercise Price to be Entitled to Receive Cash Consideration, Fundamental Transaction (in dollars per share)	1.10
Warrants Expiring March 2025 [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)	2.50
Warrant Exercise Price to be Entitled to Receive Cash Consideration, Fundamental Transaction (in dollars per share)	2.50
Warrants Expiring March 2024 [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)	3.125
Warrant Exercise Price to be Entitled to Receive Cash Consideration, Fundamental Transaction (in dollars per share)	$ 3.125

Note 10 - Stockholders' Equity - Shares of Common Stock Reserved for Issuance (Details) - shares	Jun. 30, 2020	Dec. 31, 2019
Common stock reserved for issuance (in shares)	10,355,914	45,476,994
Options Issued and Outstanding [Member]
Common stock reserved for issuance (in shares)	6,382,232	1,811,652
Performance-based Restricted Stock Units (PRSUs) [Member]
Common stock reserved for issuance (in shares)	411,000
Options Available for Future Grants [Member]
Common stock reserved for issuance (in shares)	1,620,028	295,180
Common Warrants [Member]
Common stock reserved for issuance (in shares)	1,942,654	43,370,162

Note 10 - Stockholders' Equity - Summary of Warrants Outstanding (Details)	Jun. 30, 2020 $ / shares shares
Warrants outstanding (in shares)	1,942,654
First Set of Warrants Expiring September 2024 [Member]
Warrants outstanding (in shares)	171,667
Exercise Price (in dollars per share) \| $ / shares	$ 0.30
Second Set of Warrants Expiring September 2024 [Member]
Warrants outstanding (in shares)	241,169
Exercise Price (in dollars per share) \| $ / shares	$ 0.375
First Set of Warrants Expiring April 2024 [Member]
Warrants outstanding (in shares)	225,966
Exercise Price (in dollars per share) \| $ / shares	$ 1.10
Second Set of Warrants Expiring April 2024 [Member]
Warrants outstanding (in shares)	163,068
Exercise Price (in dollars per share) \| $ / shares	$ 1.375
Warrants Expiring March 2025 [Member]
Warrants outstanding (in shares)	766,584
Exercise Price (in dollars per share) \| $ / shares	$ 2.50
Warrants Expiring February 2025 [Member]
Warrants outstanding (in shares)	280,000
Exercise Price (in dollars per share) \| $ / shares	$ 3.125
Warrants Expiring March 2024 [Member]
Warrants outstanding (in shares)	83,286
Exercise Price (in dollars per share) \| $ / shares	$ 3.125
Warrants Expiring December 2026 [Member]
Warrants outstanding (in shares)	10,914
Exercise Price (in dollars per share) \| $ / shares	$ 22.99

Note 11 - Equity Incentive Plans (Details Textual) - USD ($)							1 Months Ended		3 Months Ended		6 Months Ended
	Jul. 24, 2020	Jul. 20, 2020	Jul. 09, 2020	Jun. 23, 2020	Jun. 15, 2020	Mar. 24, 2020	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019	Apr. 23, 2019
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares)						2,610,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance (in shares)							6,382,232		6,382,232		6,382,232		1,811,652
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price, Ending Balance (in dollars per share)							$ 2.22		$ 2.22		$ 2.22		$ 2.74
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term (Year)											9 years 135 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value							$ 43,100,000		$ 43,100,000		$ 43,100,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number (in shares)							1,431,750		1,431,750		1,431,750
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Exercise Price (in dollars per share)							$ 3.22		$ 3.22		$ 3.22
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Remaining Contractual Term (Year)											8 years 113 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value							$ 8,800,000		$ 8,800,000		$ 8,800,000
Proceeds from Stock Options Exercised											$ 116,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period (in shares)											178,381	0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value											$ 524,000
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share)						$ 1.70					$ 2.04
Share-based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount							$ 5,900,000		$ 5,900,000		$ 5,900,000
Performance-based Restricted Stock Units (PRSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares)								411,000
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number, Ending Balance (in shares)							411,000		411,000		411,000
Share-based Payment Arrangement, Expense									$ 531,000		$ 531,000
March Option Awards [Member] \| Share-based Payment Arrangement, Tranche One [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage						25.00%
March Option Awards [Member] \| Share-based Payment Arrangement, Tranche Two [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Month)						2 years
Performance-based Options [Member] \| Chief Executive Officer [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares)					900,000
Time-based Options [Member] \| Chief Executive Officer [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares)					845,280
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share)					$ 2.46
Time-based Options [Member] \| Share-based Payment Arrangement, Tranche One [Member] \| Chief Executive Officer [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage					25.00%
Time-based Options [Member] \| Share-based Payment Arrangement, Tranche Two [Member] \| Chief Executive Officer [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage					75.00%
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Month)					3 years
Time-based Options [Member] \| Share-based Payment Arrangement, Tranche Three [Member] \| Chief Executive Officer [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Accelerated Vesting Percentage					50.00%
Performance-based Options and Time-based Options [Member] \| Chief Executive Officer [Member]
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share)					$ 2.46
Market Based Options [Member] \| Chief Executive Officer [Member]
Share Price (in dollars per share)							$ 2.46		$ 2.46		$ 2.46
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate							105.00%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate							0.35%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate							0.00%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term (Year)							5 years 83 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share)							$ 0.31
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Grant Date Fair Value							$ 279,000
Share-based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount							$ 242,000		$ 242,000		$ 242,000
Market Based Options [Member] \| Share-based Payment Arrangement, Tranche One [Member] \| Chief Executive Officer [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage					33.33%
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Minimum Closing Price for Ten Consecutive Trading Days (in dollars per share)					$ 5
Market Based Options [Member] \| Share-based Payment Arrangement, Tranche One [Member] \| Chief Executive Officer [Member] \| Subsequent Event [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Minimum Closing Price for Ten Consecutive Trading Days (in dollars per share)			$ 5
Market Based Options [Member] \| Share-based Payment Arrangement, Tranche Two [Member] \| Chief Executive Officer [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage					33.33%
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Minimum Closing Price for Ten Consecutive Trading Days (in dollars per share)					$ 7.50
Market Based Options [Member] \| Share-based Payment Arrangement, Tranche Two [Member] \| Chief Executive Officer [Member] \| Subsequent Event [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Minimum Closing Price for Ten Consecutive Trading Days (in dollars per share)		$ 7.50
Market Based Options [Member] \| Share-based Payment Arrangement, Tranche Three [Member] \| Chief Executive Officer [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage					33.33%
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Minimum Closing Price for Ten Consecutive Trading Days (in dollars per share)					$ 10
Market Based Options [Member] \| Share-based Payment Arrangement, Tranche Three [Member] \| Chief Executive Officer [Member] \| Subsequent Event [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Minimum Closing Price for Ten Consecutive Trading Days (in dollars per share)	$ 10
Share-based Payment Arrangement, Option [Member]
Share-based Payment Arrangement, Expense									$ 2,860,000	$ 180,000	$ 2,956,000	$ 344,000
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate											0.00%	0.00%
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share)											$ 1.92	$ 0.55
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)											2 years 76 days
The 2019 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares)				8,000,000										1,600,000
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)				10 years

Note 11 - Equity Incentive Plans - Summary of Stock Option Transactions (Details) - $ / shares		6 Months Ended
	Mar. 24, 2020	Jun. 30, 2020	Jun. 30, 2019
Shares available for grant, balance (in shares)		295,180
Number of options outstanding, beginning balance (in shares)		1,811,652
Weighted average exercise price, balance (in dollars per share)		$ 2.74
Shares availabe for grant, 2019 Plan Amendment (in shares)		6,400,000
Shares available for grant, granted (in shares)		(4,892,100)
Number of options outstanding, granted (in shares)		4,892,100
Weighted average exercise price, granted (in dollars per share)	$ 1.70	$ 2.04
Number of options outstanding, exercised (in shares)		(178,381)	0
Weighted average exercise price, exercised (in dollars per share)		$ 0.65
Shares available for grant, forfeited (in shares)		85,910
Number of options outstanding, forfeited (in shares)		(85,992)
Weighted average exercise price, forfeited (in dollars per share)		$ 0.39
Shares available for grant, canceled (in shares)		9,573
Number of options outstanding, canceled (in shares)		(57,147)
Weighted average exercise price, canceled (in dollars per share)		$ 10.50
Shares available for grant, balance (in shares)		1,620,028
Number of options outstanding, balance (in shares)		6,382,232
Weighted average exercise price, balance (in dollars per share)		$ 2.22
Performance-based Restricted Stock Units (PRSUs) [Member]
Shares available for grant, PRSU's granted (in shares)		(278,535)

Note 11 - Equity Incentive Plans - Assumptions of Options (Details) - Share-based Payment Arrangement, Option [Member]	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Dividend yield	0.00%	0.00%
Minimum [Member]
Risk-free interest rate	0.44%	1.89%
Expected term (Year)	5 years 80 days	5 years 142 days
Expected volatility	94.00%	83.00%
Maximum [Member]
Risk-free interest rate	0.88%	2.31%
Expected term (Year)	10 years	6 years 29 days
Expected volatility	104.00%	85.00%

Note 11 - Equity Incentive Plans - Total Stock-based Compensation Recognized for Options (Details) - Share-based Payment Arrangement, Option [Member] - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Share-based Payment Arrangement, Expense	$ 2,860	$ 180	$ 2,956	$ 344
Research and Development Expense [Member]
Share-based Payment Arrangement, Expense	1,115	80	1,137	159
General and Administrative Expense [Member]
Share-based Payment Arrangement, Expense	$ 1,745	$ 100	$ 1,819	$ 185

Note 12 - Related Party Transaction (Details Textual)	1 Months Ended
Note 12 - Related Party Transaction (Details Textual)	Apr. 30, 2020 USD ($)
Disgorgement of Stockholder Short-swing Profits [Member]
Related Party Transaction, Amounts of Transaction	$ 652,000

Note 13 - Net Loss Per Share (Details Textual) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Dilutive Securities, Effect on Basic Earnings Per Share, Total	$ 0	$ 0	$ 0	$ 0

Note 13 - Net Loss Per Share Attributable to Common Stockholders - Calculation of Basic and Diluted Net (Loss) Income Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Net loss	$ (8,977)	$ (5,637)	$ (10,274)	$ (6,976)
Shares used to compute net loss per share - basic and diluted (in shares)	74,675,131	14,597,446	67,676,138	10,969,473
Net loss per share - basic and diluted (in dollars per share)	$ (0.12)	$ (0.39)	$ (0.15)	$ (0.64)

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 1A
-Subparagraph (a)
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Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 31
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8924-108599

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
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-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109234566&loc=d3e22694-107794

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 220
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04(22))
-URI http://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
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-Subparagraph (a)
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Reference 6: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
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-Paragraph 32
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Reference 7: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=109222650&loc=SL51721683-107760

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
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-Paragraph 4
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Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 1B
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=121641772&loc=SL7669625-108580

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 22
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8736-108599

Reference 11: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 220
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-04(18))
-URI http://asc.fasb.org/extlink&oid=120400993&loc=SL114874131-224263

Reference 12: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(20))
-URI http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227

Reference 13: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585

Reference 14: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
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-Name Accounting Standards Codification
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-Name Accounting Standards Codification
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Reference 17: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
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-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8906-108599

Reference 18: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
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Reference 19: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
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-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690

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Reference 22: http://www.xbrl.org/2003/role/disclosureRef
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Reference 23: http://www.xbrl.org/2003/role/disclosureRef
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+ Details

Note 13 - Net Loss Per Share Attributable to Common Stockholders - Summary of Antidilutive Securities (Details) - shares	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Potentially dilutive securities excluded from denominator of the diluted earnings per share computation (in shares)	26,588,035	13,363,762	31,169,834	7,157,602
Share-based Payment Arrangement, Option [Member]
Potentially dilutive securities excluded from denominator of the diluted earnings per share computation (in shares)	2,654,144	1,561,067	2,216,462	1,212,654
Performance-based Restricted Stock Units (PRSUs) [Member]
Potentially dilutive securities excluded from denominator of the diluted earnings per share computation (in shares)	411,000		223,566
Warrant [Member]
Potentially dilutive securities excluded from denominator of the diluted earnings per share computation (in shares)	23,522,891	11,802,695	28,729,806	5,944,948

Note 14 - Restructuring Costs - Restructuring Liabilities (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Cumulative cost incurred	$ 5,023		$ 5,023
Balance			3,648
Restructuring costs	39		103
Payments and settlements			(518)
Balance	3,233		3,233
Contract Termination [Member]
Cumulative cost incurred	3,223		3,223
Balance			3,223
Restructuring costs
Payments and settlements
Balance	3,223		3,223
Employee Severance [Member]
Cumulative cost incurred	368		368
Balance			368
Restructuring costs
Payments and settlements			(368)
Balance
Impairment Charges [Member]
Cumulative cost incurred	1,272		1,272
Balance
Restructuring costs
Payments and settlements
Balance
Other Restructuring [Member]
Cumulative cost incurred	160		160
Balance			57
Restructuring costs			103
Payments and settlements			(150)
Balance	$ 10		$ 10

Note 15 - Subsequent Events (Details Textual) - USD ($) $ in Thousands		1 Months Ended	6 Months Ended
	Jul. 13, 2020	Aug. 10, 2020	Jun. 30, 2020	Jun. 30, 2019
Stock Issued During Period, Value, New Issues				$ 2,440
Proceeds from Issuance of Common Stock			$ 9,175	2,540
Proceeds from Warrant Exercises			$ 24,658
Subsequent Event [Member]
Stock Issued During Period, Value, Exercise of Common Stock Warrants (in shares)		531,013
Proceeds from Warrant Exercises		$ 1,200
Subsequent Event [Member] \| ATM Program [Member]
Stock Issued During Period, Shares, New Issues (in shares)	12,503,806
Stock Issued During Period, Value, New Issues	$ 100,000
Proceeds from Issuance of Common Stock	$ 97,000