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Note 15 - Equity-based Compensation (Tables)

12 Months Ended

Dec. 31, 2021

Notes Tables

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

(in thousands, except years and per share data)		Options				Weighted- Average Exercise Price				Weighted- Average Remaining Contractual Life (years)				Aggregate Intrinsic Value
Outstanding at December 31, 2020			3,165			$	2.05				7.6			$	189
Options granted			516			$	0.66
Restricted stock units granted			1,528			$	—
Restricted stock units vested			(488	)		$	—
Options forfeited/cancelled			(272	)		$	2.35
Outstanding at December 31, 2021			4,449			$	1.39				7.6			$	460
Vested and expected to vest at December 31, 2021			4,125			$	1.46				7.5			$	406
Vested at December 31, 2021			2,150			$	2.42				5.4			$	8
Exercisable at December 31, 2021			2,150			$	2.42				5.9			$	8

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

		Year Ended December 31,
		2021				2020				2019
Research and development		$	10			$	23			$	42
Sales and marketing			129				85				93
General and administrative			794				424				351
Total stock-based compensation expense		$	933			$	532			$	486

Nonemployees [Member]

Notes Tables

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

		Year Ended December 31,
Assumptions		2021				2020
Expected price volatility			—				162	%
Expected term (in years)			—				6.34
Risk-free interest rate			—				0.50	%
Dividend yield			—				0.00	%
Weighted-average fair value of options granted during the period		$	—			$	0.73

Employees and Directors [Member]

Notes Tables

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

		Year Ended December 31,
Assumptions		2021				2020				2019
Expected price volatility			164	%			161	%			112	%
Expected term (in years)			6.19				6.45				6.14
Risk-free interest rate			1.05	%			0.45	%			1.99	%
Dividend yield			0.00	%			0.00	%			0.00	%
Weighted-average fair value of options granted during the period		$	0.64			$	0.94			$	0.31

X

- Definition

Tabular disclosure of allocation of amount expensed and capitalized for award under share-based payment arrangement to statement of income or comprehensive income and statement of financial position. Includes, but is not limited to, corresponding line item in financial statement.

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