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Note 13 - Equity-based Compensation (Tables)

3 Months Ended

Mar. 31, 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			4			$	1.80
Options forfeited/cancelled			(5	)		$	59.45
Restricted stock units cancelled			(7	)			—
Outstanding at March 31, 2023			124			$	38.34				7.3			$	48
Vested and expected to vest at March 31, 2023			95			$	49.23				6.9			$	9
Vested at March 31, 2023			66			$	65.02				6.1			$	—
Exercisable at March 31, 2023			66			$	65.02				6.1			$	—

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

		Three Months Ended March 31,
		2023				2022
Research and development		$	6			$	4
Sales and marketing			15				12
General and administrative			54				168
Total stock-based compensation expense		$	75			$	184

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		2023				2022
Expected price volatility			154.49	%			160.47	%
Expected term (in years)			6.66				6.45
Risk-free interest rate			3.41	%			1.63	%
Dividend yield			0.00	%			0.00	%
Weighted-average fair value of options granted during the period		$	2.37			$	10.21

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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