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Note 15 - Equity-based Compensation (Tables)

3 Months Ended

Mar. 31, 2022

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, 2021			4,449			$	1.39				7.6			$	460
Options granted			332			$	0.30
Options forfeited/cancelled			(21	)		$	10.94
Outstanding at March 31, 2022			4,760			$	1.27				7.6			$	356
Vested and expected to vest at March 31, 2022			4,416			$	1.33				7.5			$	313
Vested at March 31, 2022			2,218			$	2.30				5.8			$	—
Exercisable at March 31, 2022			2,218			$	2.30				5.8			$	—

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

		Three Months Ended March 31,
		2022				2021
Research and development		$	4			$	4
Sales and marketing			12				31
General and administrative			168				148
Total stock-based compensation expense		$	184			$	183

Employees and Directors [Member]

Notes Tables

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

		Three Months Ended March 31,
Assumption		2022				2021
Expected price volatility			160.47	%			164.44	%
Expected term (in years)			6.45				6.19
Risk-free interest rate			1.63	%			1.09	%
Dividend yield			0.00	%			0.00	%
Weighted-average fair value of options granted during the period		$	0.29			$	1.04

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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