Consolidated Statements of Stockholders' Equity (Deficit) - USD ($) $ in Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	AOCI Attributable to Parent [Member]	Retained Earnings [Member]	Total
Balance (in shares) at Dec. 31, 2020	40,086,387
Balance at Dec. 31, 2020	$ 4	$ 1,331,676	$ 0	$ (1,337,631)	$ (5,951)
Stock-based compensation	$ 0	32,633	0	0	32,633
Shares issued or restricted stock units vested under employee stock plans (in shares)	1,089,120
Shares issued or restricted stock units vested under employee stock plans	$ 0	0	0	0	0
Unrealized gain (loss) on available-for-sale securities, net of tax of $0	0	0	(2)	0	(2)
Net income (loss)	$ 0	0	0	(29,126)	(29,126)
Balance (in shares) at Dec. 31, 2021	41,175,507
Balance at Dec. 31, 2021	$ 4	1,364,309	(2)	(1,366,757)	(2,446)
Stock-based compensation	$ 0	11,826	0	0	11,826
Shares issued or restricted stock units vested under employee stock plans (in shares)	1,017,744
Shares issued or restricted stock units vested under employee stock plans	$ 0	0	0	0	0
Unrealized gain (loss) on available-for-sale securities, net of tax of $0	0	0	2	0	2
Net income (loss)	$ 0	0	0	2	2
Shares issued under private investments in public equity, net of issuance costs of approximately $0.2M (in shares)	4,152,409
Shares issued under private investments in public equity, net of issuance costs of approximately $0.2M	$ 1	12,223	0	0	$ 12,224
Balance (in shares) at Dec. 31, 2022	46,345,660				46,345,660
Balance at Dec. 31, 2022	$ 5	1,388,358	0	(1,366,755)	$ 21,608
Stock-based compensation	$ 0	10,247	0	0	10,247
Shares issued or restricted stock units vested under employee stock plans (in shares)	1,301,127
Shares issued or restricted stock units vested under employee stock plans	$ 0	0	0	0	0
Unrealized gain (loss) on available-for-sale securities, net of tax of $0	0	0	(4)	0	(4)
Net income (loss)	$ 0	0	0	21,591	$ 21,591
Balance (in shares) at Dec. 31, 2023	47,646,787				47,646,787
Balance at Dec. 31, 2023	$ 5	$ 1,398,605	$ (4)	$ (1,345,164)	$ 53,442