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Note 4 - Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2021

Notes Tables

Fair Value, Assets Measured on Recurring Basis [Table Text Block]

						Fair Value Measurements Using
		Balance at				Quoted Prices in				Significant				Significant
		December 31,				Active Markets				Other				Unobservable
		2021				for Identical				Observable				Inputs
						Items				Inputs				(Level 3)
						(Level 1)				(Level 2)
Assets
Restricted cash held as a certificate of deposit		$	324			$	324			$	—			$	—
Deposit held as a certificate of deposit			151				151				—				—
Total assets		$	475			$	475			$	—			$	—
Liabilities
Warrant liability		$	9,558				—				—			$	9,558
Contingent earnout liability			561				—				—				561
Total liabilities		$	10,119			$	—			$	—			$	10,119

						Fair Value Measurements Using
		Balance at				Quoted Prices in				Significant				Significant
		December 31,				Active Markets				Other				Unobservable
		2020				for Identical				Observable				Inputs
						Items				Inputs				(Level 3)
						(Level 1)				(Level 2)
Assets
Restricted cash held as a certificate of deposit		$	324			$	324			$	—			$	—
Deposit held as a certificate of deposit			151				151				—				—
Total assets		$	475			$	475			$	—			$	—

Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]

Fair value of warrant liability at December 31, 2020		$	—
Fair value of 2021 Warrants issued			14,172
Decrease in fair value of 2021 Warrants			(4,614	)
Fair value of warrant liability at December 31, 2021		$	9,558

Fair value of warrant liability and embedded derivative liability at December 31, 2019		$	4,092
Increase in fair value of warrant liability			5,238
Decrease in fair value of embedded derivative liability			(2	)
Decrease in fair value related to warrants expired			(22	)
Fair value of warrant liability transferred to equity upon exercise			(9,108	)
Fair value of 2019 Ladenburg Warrant liability transferred to equity upon warrant modification			(197	)
Elimination of embedded derivative liability upon settlement of convertible note			(1	)
Fair value of warrant liability and embedded derivative liability at December 31, 2020		$	—

X

- Definition

Tabular disclosure of assets, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258

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- Definition

Tabular disclosure of the fair value measurement of liabilities using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets), and gains or losses recognized in other comprehensive income (loss) and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs) by class of liability.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19279-110258

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No definition available.

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