Condensed Consolidated Statements of Changes in Stockholders' Equity (Unaudited) - 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	$ 0	1,786	0	0	1,786
Award of restricted stock units (in shares)	706,000	0
Award of restricted stock units	$ 1	$ 0	0	0	0	1
Return of common stock to pay withholding taxes on restricted stock (in shares)	0	67,000
Return of common stock to pay withholding taxes on restricted stock	$ 0	$ 0	(214)	0	0	(214)
Cancellation of treasury stock (in shares)	0	(67,000)
Cancellation of treasury stock	$ 0	$ 0	0	0	0	0
Other comprehensive loss	0	0	0	0	(1,938)	(1,938)
Net loss	$ 0	$ 0	0	(17,340)	0	(17,340)
Issuance of common stock, net of issuance costs (in shares)	70,666,000	0
Issuance of common stock, net of issuance costs	$ 71	$ 0	129,251	0	0	129,322
Exercise of stock options and warrants (in shares)	45,114,000	0
Exercise of stock options and warrants	$ 45	$ 0	32,687	0	0	32,732
Balance (in shares) at Mar. 31, 2021	232,717,000	0
Balance at Mar. 31, 2021	$ 233	$ 0	944,907	(740,252)	1,030	205,918
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
Net loss						(30,512)
Balance (in shares) at Jun. 30, 2021	234,231,000	0
Balance at Jun. 30, 2021	$ 234	$ 0	947,249	(753,424)	1,502	195,561
Balance (in shares) at Mar. 31, 2021	232,717,000	0
Balance at Mar. 31, 2021	$ 233	$ 0	944,907	(740,252)	1,030	205,918
Stock-based compensation	$ 0	$ 0	1,842	0	0	1,842
Award of restricted stock units (in shares)	674,000	0
Award of restricted stock units	$ 1	$ 0	0	0	0	1
Return of common stock to pay withholding taxes on restricted stock (in shares)	0	246,000
Return of common stock to pay withholding taxes on restricted stock	$ 0	$ 0	(829)	0	0	(829)
Cancellation of treasury stock (in shares)	0	(246,000)
Cancellation of treasury stock	$ 0	$ 0	0	0	0	0
Other comprehensive loss	0	0	0	0	472	472
Net loss	$ 0	$ 0	0	(13,172)	0	(13,172)
Issuance of common stock, net of issuance costs (in shares)	332,000	0
Issuance of common stock, net of issuance costs	$ 0	$ 0	992	0	0	992
Exercise of stock options and warrants (in shares)	508,000	0
Exercise of stock options and warrants	$ 0	$ 0	337	0	0	337
Balance (in shares) at Jun. 30, 2021	234,231,000	0
Balance at Jun. 30, 2021	$ 234	$ 0	947,249	(753,424)	1,502	195,561
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		2,245	0	0	2,245
Exercise of stock options (in shares)	30,000	0
Exercise of stock options	$ 0	$ 0	12	0	0	12
Award of restricted stock units (in shares)	1,166,000	0
Award of restricted stock units	$ 1	$ 0	0	0	0	1
Return of common stock to pay withholding taxes on restricted stock (in shares)	0	436,000
Return of common stock to pay withholding taxes on restricted stock	$ 0	$ 0	(349)	0	0	(349)
Cancellation of treasury stock (in shares)	0	(436,000)
Cancellation of treasury stock	$ 0	$ 0	0	0	0	0
Other comprehensive loss	0	0	0	0	(1,202)	(1,202)
Net loss	$ 0	$ 0		(19,128)	0	(19,128)
Balance (in shares) at Mar. 31, 2022	236,415,000	0
Balance at Mar. 31, 2022	$ 236	$ 0	956,557	(804,502)	(1,466)	150,825
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
Exercise of stock options (in shares)						43,453
Net loss						$ (38,747)
Issuance of common stock, net of issuance costs (in shares)						19,451,848
Balance (in shares) at Jun. 30, 2022	236,620,000	0
Balance at Jun. 30, 2022	$ 237	$ 0	958,646	(824,121)	(3,323)	$ 131,439
Balance (in shares) at Mar. 31, 2022	236,415,000	0
Balance at Mar. 31, 2022	$ 236	$ 0	956,557	(804,502)	(1,466)	150,825
Stock-based compensation	$ 0		2,083	0	0	2,083
Exercise of stock options (in shares)	13,000	0
Exercise of stock options	$ 0	$ 0	6	0	0	6
Award of restricted stock units (in shares)	192,000	0
Award of restricted stock units	$ 1	$ 0	0	0	0	1
Other comprehensive loss	0			0	(1,857)	(1,857)
Net loss	$ 0			(19,619)	0	(19,619)
Balance (in shares) at Jun. 30, 2022	236,620,000	0
Balance at Jun. 30, 2022	$ 237	$ 0	$ 958,646	$ (824,121)	$ (3,323)	$ 131,439