Note 8 - Stock-based Compensation (Tables)

6 Months Ended

Jun. 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		(1,068	)	$	108.50		—
Balance—June 30, 2024		15,297		$	110.65		3.88
Exercisable as of June 30, 2024		15,297		$	110.65		3.88
Vested and expected to vest as of June 30, 2024		15,297		$	110.65		3.88

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		1,209,649		$	2.40
Vested		(294,641	)	$	10.09
Forfeited		(309,516	)	$	4.72
Nonvested at June 30, 2024		1,446,307		$	4.60

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

	Three Months Ended June 30,				Six Months Ended June 30,
	2023		2024		2023		2024
	(in thousands)				(in thousands)
Sales and distribution expenses	$	1,091	$	946	$	1,761	$	1,245
Research and development expenses		423		—		857		—
General and administrative expenses		1,709		1,975		2,921		3,343
Total stock-based compensation expense	$	3,223	$	2,921	$	5,539	$	4,588