Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($) shares in Thousands, $ in Thousands	Common Stock Outstanding [Member]	Additional Paid-in Capital [Member]	AOCI Attributable to Parent [Member]	Retained Earnings [Member]	Total
Balance (in shares) at Dec. 31, 2021	100,832
Balance at Dec. 31, 2021	$ 10	$ 373,657	$ 0	$ (233,589)	$ 140,078
Vesting of share-based awards (in shares)	73
Vesting of share-based awards	$ 0	0	0	0	0
Stock-based compensation	0	1,574	0	0	1,574
Unrealized gain on marketable securities					0
Net loss	$ 0	0	0	(7,162)	(7,162)
Balance (in shares) at Mar. 31, 2022	100,905
Balance at Mar. 31, 2022	$ 10	375,231	0	(240,751)	134,490
Balance (in shares) at Dec. 31, 2022	126,302
Balance at Dec. 31, 2022	$ 13	454,741	(302)	(272,814)	181,638
Vesting of share-based awards (in shares)	61
Vesting of share-based awards	$ 0	0	0	0	0
Stock-based compensation	$ 0	1,267	0	0	$ 1,267
Common stock issued upon exercise of options (in shares)	12				12
Common stock issued upon exercise of options	$ 0	41	0	0	$ 41
Unrealized gain on marketable securities	0	0	156	0	156
Net loss	$ 0	0	0	(7,837)	(7,837)
Balance (in shares) at Mar. 31, 2023	126,375
Balance at Mar. 31, 2023	$ 13	$ 456,049	$ (146)	$ (280,651)	$ 175,265