Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($) $ in Thousands	Common Stock [Member]	Treasury Stock, Common [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Total
Balances (in shares) at Dec. 31, 2021	125,594,393
Balances at Dec. 31, 2021	$ 13		$ 406,943	$ (219,351)	$ (74)	$ 187,531
Issuance of common stock (in shares)	216,000
Issuance of common stock	$ 0		992	0	0	992
Stock-based compensation	0		3,130	0	0	3,130
Unrealized gains on available-for-sale investments	0		0	0	(235)	(235)
Net loss	$ 0		0	(25,101)	0	(25,101)
Issuance of common stock upon exercise of stock options (in shares)	30,418
Issuance of common stock upon exercise of stock options	$ 0		48	0	0	48
Balances (in shares) at Mar. 31, 2022	125,840,811
Balances at Mar. 31, 2022	$ 13		411,113	(244,452)	(309)	166,365
Balances (in shares) at Dec. 31, 2022	134,199,429	0
Balances at Dec. 31, 2022	$ 13	$ 0	437,992	(327,109)	(299)	110,597
Issuance of common stock (in shares)	1,362,220	0
Issuance of common stock	$ 1	$ 0	1,429	0	0	1,430
Stock-based compensation	$ 0	$ 0	2,647	0	0	2,647
Release of common stock for vested restricted stock units (in shares)	49,220	0
Release of common stock for vested restricted stock units	$ 0	$ 0	0	0	0	0
Repurchase of common stock to satisfy tax withholding (in shares)	0	(13,553)
Repurchase of common stock to satisfy tax withholding	$ 0	$ (10)	0	0	0	(10)
Unrealized gains on available-for-sale investments	0	0	0	0	229	229
Net loss	$ 0	$ 0	0	(25,140)	0	$ (25,140)
Issuance of common stock upon exercise of stock options (in shares)						(0)
Balances (in shares) at Mar. 31, 2023	135,610,869	(13,553)
Balances at Mar. 31, 2023	$ 14	$ (10)	$ 442,068	$ (352,249)	$ (70)	$ 89,753