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Note 12 - Stock-based Compensation (Tables)

9 Months Ended

12 Months Ended

Sep. 30, 2023

Dec. 31, 2022

Notes Tables

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

		Number of Options				Weighted- Average Exercise Price				Weighted- Average Remaining Contractual Term (years)				Intrinsic Value (in thousands)
Balance as of December 31, 2022			6,067,313			$	1.83				2.07
Forfeited			(425,178	)			3.98
Exercised			(186,307	)			1.13
Expired			(177,430	)			2.27
Outstanding at September 30, 2023			5,278,398			$	1.61				1.78			$	1,041
Exercisable at September 30, 2023			4,594,898			$	1.40				1.71			$	1,000

		Number of Options				Weighted-Average Exercise Price				Weighted-Average Remaining Contractual Term (years)				Intrinsic Value (in thousands)
Balance as of December 31, 2021			6,864,563			$	2.05				2.36
Granted			—				—
Forfeited			(574,299	)			4.56
Exercised			(102,825	)			1.12
Expired			(120,126	)			2.60
Outstanding at December 31, 2022			6,067,313			$	1.83				2.07			$	10,818
Exercisable at December 31, 2022			4,449,152			$	1.31				1.92			$	8,832

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

		Year Ended December 31,
		2022				2021					2020
Weighted-average fair value of options at the measurement date (grant date)		$	—				$23.36					$6.31
Dividend yield (%)			—				—					—
Expected volatility (%)			—	%		61	-	72			59	-	61
Risk-free interest rate (%)			—	%		0.5	-	1.4			0.4	-	0.5
Weighted average share price		$	—				$6.79					$2.75

Share-Based Payment Arrangement, Restricted Stock Unit, Activity [Table Text Block]

		Number of RSUs				Intrinsic value (in thousands)
Outstanding unvested RSUs at December 31, 2022			1,459,280
Granted during the year			3,369,167
Forfeited during the year			(559,809	)
Vested during the year			(494,287	)
Outstanding unvested RSUs at September 30, 2023			3,774,351			$	4,416

		Number of RSUs				Intrinsic Value (in thousands)
Outstanding unvested RSUs at December 31, 2021			—
Granted during the year			1,640,496
Forfeited during the year			(60,823	)
Vested during the year			(120,393	)
Expired during the year			—
Outstanding unvested RSUs at December 31, 2022			1,459,280			$	1,940

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 expenses		$	884			$	554			$	2,714			$	2,240
Research and development expenses			312				781				933				1,753
Other operating expenses			218				804				607				2,631
Total		$	1,414			$	2,139			$	4,254			$	6,624

		Year Ended December 31,
		2022				2021				2020
General and administrative expenses		$	2,406			$	5,274			$	1,235
Research and development			3,631				1,968				382
Other operating expenses			2,331				3,639				115
Total		$	8,368			$	10,881			$	1,732

X

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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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