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Note 13 - Equity-based Compensation (Tables)

9 Months Ended

Sep. 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			(19	)		$	64.23
Restricted stock units cancelled			(7	)			—
Outstanding at September 30, 2023			148			$	26.26				7.6			$	13
Vested and expected to vest at September 30, 2023			119			$	32.34				7.5			$	2
Vested at September 30, 2023			59			$	59.30				5.8			$	—
Exercisable at September 30, 2023			59			$	59.30				5.8			$	—

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

		Three Months Ended September 30,								Nine Months Ended September 30,
		2023				2022				2023				2022
Research and development		$	5			$	5			$	16			$	14
Sales and marketing			18				12				49				37
General and administrative			39				(225	)			136				79
Total stock-based compensation expense		$	62			$	(208	)		$	201			$	130

Employees and Directors [Member]

Notes Tables

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

		Nine Months Ended September 30,
Assumption		2023				2022
Expected price volatility			152.99	%			158.04	%
Expected term (in years)			6.81				6.45
Risk-free interest rate			3.47	%			2.29	%
Dividend yield			0.00	%			0.00	%
Weighted-average fair value of options granted during the period		$	1.61			$	9.46

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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