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Note 16 - Stock-based Compensation (Tables)

9 Months Ended

Sep. 30, 2023

Notes Tables

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

		Number of Underlying Shares				Weighted-Average Exercise Price Per Share				Weighted-Average Contractual Life Remaining in Years				Aggregate Intrinsic Value
Outstanding as of January 1, 2023			13,906			$	2.35
Granted			6,691			$	0.82							$	27
Exercised			-				-
Forfeited			(419	)		$	0.90
Expired			(4	)		$	870.40
Outstanding as of September 30, 2023			20,174			$	1.68				7.86			$	117
Exercisable as of September 30, 2023			13,704			$	2.04				7.13			$	24
Vested and expected to vest			20,174			$	1.68				7.86			$	117

Share-Based Payment Arrangement, Option [Member]

Notes Tables

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
General and administrative		$	602			$	1,042			$	2,813			$	3,366
Research and development			324				624				1,289				1,877
Total stock compensation expense		$	926			$	1,666			$	4,102			$	5,243

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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- Definition

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