Consolidated Statements of Changes in Stockholders' Equity - USD ($) $ in Thousands	Common Stock [Member]	Treasury Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Total
Balance (in shares) at Dec. 31, 2020	116,231,000	0
Balance at Dec. 31, 2020	$ 116	$ 0	$ 781,397	$ (722,912)	$ 2,968	$ 61,569
Stock-based compensation	$ 0		9,429	0	0	9,429
Issuance of common stock, net of issuance costs (in shares)	71,787,000	0
Issuance of common stock, net of issuance costs	$ 72	$ 0	131,857	0	0	131,929
Exercise of stock options and warrants (in shares)	45,630,000	0
Exercise of stock options and warrants	$ 46	$ 0	33,029	0	0	33,075
Award of restricted stock units (in shares)	1,571,000
Award of restricted stock units	$ 1
Return of common stock to pay withholding taxes on restricted stock (in shares)	0	320,000
Return of common stock to pay withholding taxes on restricted stock	$ 0	$ 0	(1,063)	0	0	(1,063)
Cancellation of treasury stock (in shares)	0	(320,000)
Cancellation of treasury stock	$ 0	$ 0	0	0	0	0
Other comprehensive loss	0	0	0	0	(3,232)	(3,232)
Net loss	$ 0	$ 0		(62,462)	0	(62,462)
Balance (in shares) at Dec. 31, 2021	235,219,000	0
Balance at Dec. 31, 2021	$ 235	$ 0	954,649	(785,374)	(264)	169,246
Stock-based compensation	$ 0		8,416	0	0	8,416
Award of restricted stock units (in shares)	1,633,000	0
Award of restricted stock units	$ 2	$ 0	0	0	0	2
Return of common stock to pay withholding taxes on restricted stock (in shares)	0	443,000
Return of common stock to pay withholding taxes on restricted stock	$ 0	$ 0	(352)	0	0	(352)
Cancellation of treasury stock (in shares)	0	(443,000)
Cancellation of treasury stock	$ 0	$ 0	0	0	0	0
Other comprehensive loss	0			0	(2,124)	(2,124)
Net loss	$ 0			(75,561)	0	$ (75,561)
Exercise of stock options (in shares)	43,000	0				43,453
Exercise of stock options	$ 0	$ 0	18	0	0	$ 18
Balance (in shares) at Dec. 31, 2022	236,895,000	0
Balance at Dec. 31, 2022	$ 237	$ 0	$ 962,731	$ (860,935)	$ (2,388)	$ 99,645