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Note 13 - Equity-based Compensation (Tables)

6 Months Ended

Jun. 30, 2023

Notes Tables

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

(in thousands, except years and per share data)		Awards				Weighted- Average Exercise Price				Weighted- Average Remaining Contractual Life (years)				Aggregate Intrinsic Value
Outstanding at December 31, 2022			132			$	37.99				7.5			$	69
Options granted			42			$	1.67
Restricted stock units granted			5				—
Restricted stock units vested			(5	)			—
Options forfeited/cancelled			(16	)		$	63.10
Restricted stock units cancelled			(7	)			—
Outstanding at June 30, 2023			151			$	26.92				7.9			$	21
Vested and expected to vest at June 30, 2023			120			$	33.13				7.8			$	4
Vested at June 30, 2023			56			$	63.79				5.9			$	—
Exercisable at June 30, 2023			56			$	63.79				5.9			$	—

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

		Three Months Ended June 30,								Six Months Ended June 30,
		2023				2022				2023				2022
Research and development		$	5			$	5			$	11			$	9
Sales and marketing			17				13				32				25
General and administrative			42				136				96				304
Total stock-based compensation expense		$	64			$	154			$	139			$	338

Employees and Directors [Member]

Notes Tables

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

		Six Months Ended June 30,
Assumption		2023				2022
Expected price volatility			152.99	%			160.41	%
Expected term (in years)			6.81				6.45
Risk-free interest rate			3.47	%			1.65	%
Dividend yield			0.00	%			0.00	%
Weighted-average fair value of options granted during the period		$	1.61			$	10.17

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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