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Note 18 - Income Taxes (Tables)

12 Months Ended

Dec. 31, 2021

Notes Tables

Schedule of Income before Income Tax, Domestic and Foreign [Table Text Block]

		Year Ended December 31,
		2021				2020				2019
United States		$	(5,824	)		$	(11,034	)		$	(9,652	)
International			—				—				—
		$	(5,824	)		$	(11,034	)		$	(9,652	)

Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]

		Year Ended December 31,
		2021				2020				2019
Current
Federal		$	—			$	—			$	—
State			—				5				6
Other			—				—				—
Total current tax expense			—				5				6
Deferred
Federal			—				—				—
State			—				—				—
Other			—				—				—
Total deferred tax expense			—				—				—
Income tax provision		$	—			$	5			$	6

Schedule of Deferred Tax Assets and Liabilities [Table Text Block]

		Year Ended December 31,
		2021				2020
Deferred tax assets:
Net operating losses		$	33,455			$	31,115
Stock options			884				790
Research and development credits			641				641
Accruals			306				267
Operating lease liabilities			19				109
Property and equipment			10				2
Other deferred tax assets			376				81
Total deferred tax assets			35,691				33,005
Deferred tax liabilities:
Operating lease right-of-use assets			(19	)			(108	)
Total deferred tax liabilities			(19	)			(108	)
Valuation allowance			(35,672	)			(32,897	)
Net deferred taxes		$	—			$	—

Summary of Operating Loss Carryforwards and Tax Credit Carryforwards [Table Text Block]

						Expiration
		Amount				Years
Net operating losses, federal (Post December 31, 2017)		$	30,989			Does Not Expire
Net operating losses, federal (Pre January 1, 2018)		$	94,886			Beginning in 2024
Net operating losses, state		$	106,784			Beginning in 2028
Tax credits, federal		$	1,321			Beginning in 2026
Tax credits, state		$	325			Indefinite

Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block]

		Year Ended December 31,
		2021				2020
Unrecognized benefit - beginning of period		$	974			$	974
Change during the period			—				—
Unrecognized benefit - end of period		$	974			$	974

Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]

		Year Ended December 31,
		2021				2020				2019
Statutory rate			21.0	%			21.0	%			21.0	%
State tax			11.2	%			3.2	%			3.1	%
Change in valuation allowance			(47.7	%)			(11.7	%)			(23.0	%)
Warrant/equity expenses			16.7	%			(10.3	%)			1.7	%
Stock-based compensation expense			(1.1	%)			(4.0	%)			(3.7	%)
Other			(0.1	%)			1.7	%			(0.3	%)
Impact of 162m			—	%			—	%			1.1	%
Total			0.0	%			(0.1	%)			(0.1	%)

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