Note 8 - Stock-based Compensation (Tables)

9 Months Ended

Sep. 30, 2024

Notes Tables

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

	Options Outstanding
	Number of Options (*)			Weighted- Average Exercise Price		Weighted- Average Remaining Contractual Life (years)
Balance—January 1, 2024		16,365		$	110.51		5.00
Options granted		—		$	—		—
Options exercised		—		$	—		—
Options canceled		(3,314	)	$	114.02		—
Balance—September 30, 2024		13,051		$	109.62		4.25
Exercisable as of September 30, 2024		13,051		$	109.62		4.25
Vested and expected to vest as of September 30, 2024		13,051		$	109.62		4.25

Nonvested Restricted Stock Shares Activity [Table Text Block]

Restricted Stock Awards	Shares (*)			Weighted Average Grant-Date Fair Value
Nonvested at January 1, 2024		840,815		$	9.73
Granted		1,384,474		$	2.45
Vested		(466,974	)	$	9.57
Forfeited		(327,813	)	$	4.91
Nonvested at September 30, 2024		1,430,502		$	3.84

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

	Three Months Ended September 30,				Nine Months Ended September 30,
	2023		2024		2023		2024
	(in thousands)				(in thousands)
Sales and distribution expenses	$	330	$	457	$	2,091	$	1,702
Research and development expenses		278		—		1,134		—
General and administrative expenses		624		1,349		3,546		4,692
Total stock-based compensation expense	$	1,232	$	1,806	$	6,771	$	6,394