Condensed Consolidated Statements of Stockholders’ Equity - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Accumulated Deficit
Beginning balance (in shares) at Dec. 31, 2021		179,206,456
Beginning balance at Dec. 31, 2021	$ 169,795	$ 1,782	$ 905,145	$ (737,132)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock from option exercises (in shares)		19,292
Issuance of common stock from option exercises	56		56
Stock-based compensation	5,032		5,032
Issuance of common stock from releases of restricted stock units (in shares)		1,216,278
Issuance of common stock from releases of restricted stock units	0	$ 12	(12)
Tax withholding paid on behalf of employees for stock-based awards	(1,604)		(1,604)
Net Income (Loss) Attributable to Parent	(25,774)			(25,774)
Ending balance (in shares) at Mar. 31, 2022		180,442,026
Ending balance at Mar. 31, 2022	147,505	$ 1,794	908,617	(762,906)
Beginning balance (in shares) at Dec. 31, 2022		181,586,944
Beginning balance at Dec. 31, 2022	$ 82,242	$ 1,806	924,898	(844,462)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock from option exercises (in shares)	224,741	224,741
Issuance of common stock from option exercises	$ 288	$ 2	286
Stock-based compensation	3,337		3,337
Issuance of common stock from releases of restricted stock units (in shares)		1,572,384
Issuance of common stock from releases of restricted stock units	0	$ 16	(16)
Tax withholding paid on behalf of employees for stock-based awards	(1,751)		(1,751)
Net Income (Loss) Attributable to Parent	(28,859)			(28,859)
Ending balance (in shares) at Mar. 31, 2023		183,384,069
Ending balance at Mar. 31, 2023	$ 55,257	$ 1,824	$ 926,754	$ (873,321)