Note 11 - Stock-based Compensation (Tables)

12 Months Ended

Dec. 31, 2023

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)		Aggregate Intrinsic Value
Balance—January 1, 2023		368,596		$	9.26		5.89	$	—
Options granted		—		$	—		—	$	—
Options exercised		—		$	—		—	$	—
Options canceled		(172,292	)	$	9.32		—	$	—
Balance—December 31, 2023		196,304		$	9.21		5.00	$	—
Exercisable as of December 31, 2023		196,304		$	9.21		5.00	$	—
Vested and expected to vest as of December 31, 2023		196,304		$	9.21		5.00	$	—

Nonvested Restricted Stock Shares Activity [Table Text Block]

Restricted Stock Awards	Shares			Weighted Average Grant- Date Fair Value
Nonvested at January 1, 2023		4,223,023		$	4.85
Granted		13,138,725		$	0.50
Vested		(3,180,053	)	$	3.07
Forfeited		(4,093,643	)	$	2.21
Nonvested at December 31, 2023		10,088,052		$	0.81

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

	Year Ended December 31,
	2022		2023
	(in thousands)
Sales and distribution expenses	$	5,014	$	2,439
Research and development expenses		1,871		1,414
General and administrative expenses		7,709		4,483
Total stock-based compensation expense	$	14,594	$	8,336