Condensed Consolidated Statements of Shareholders' Equity - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	AOCI Attributable to Parent [Member]	Retained Earnings [Member]
Beginning balance, value at Dec. 31, 2021	$ 112,754	$ 164	$ 742,042	$ (19)	$ (629,433)
Beginning balance, share at Dec. 31, 2021		164,363,000
Share-based compensation expense	3,734	$ 1	3,733	0	0
Share-based compensation expense, share		334,000
Exercise of options	253	$ 0	253	0	0
Exercise of options, share		190,000
Net loss	(13,168)	$ 0	0	0	(13,168)
Other comprehensive loss	(105)	$ 0	0	(105)	0
Ending balance, share at Mar. 31, 2022		164,887,000
Ending balance, value at Mar. 31, 2022	103,468	$ 165	746,028	(124)	(642,601)
Beginning balance, value at Dec. 31, 2021	$ 112,754	$ 164	742,042	(19)	(629,433)
Beginning balance, share at Dec. 31, 2021		164,363,000
Ending balance, share at Dec. 31, 2022	170,503,000	170,503,000
Ending balance, value at Dec. 31, 2022	$ 89,741	$ 171	772,221	(127)	(682,524)
Share-based compensation expense	2,949	$ 0	2,949	0	0
Share-based compensation expense, share		463,000
Sales of common stock	12,691	$ 5	12,686	0	0
Sales of common stock, share		5,060,000
Net loss	(19,027)	$ 0	0	0	(19,027)
Other comprehensive loss	$ 184	$ 0	0	184	0
Ending balance, share at Mar. 31, 2023	176,026,000	176,026,000
Ending balance, value at Mar. 31, 2023	$ 86,538	$ 176	$ 787,856	$ 57	$ (701,551)