Condensed Consolidated Statements of Shareholders' Equity - USD ($) $ in Thousands	Total	Cumulative Effect, Period of Adoption, Adjustment	Common Stock	Additional Paid-in Capital	Additional Paid-in Capital Cumulative Effect, Period of Adoption, Adjustment	Accumulated Other Comprehensive Income	Accumulated Deficit	Accumulated Deficit Cumulative Effect, Period of Adoption, Adjustment
Balances (in shares) at Dec. 31, 2020			187,663,207
Balances at Dec. 31, 2020	$ 67,174		$ 0	$ 1,886,567		$ 3,997	$ (1,823,390)
Increase (Decrease) in Stockholders' Equity
Stock-based compensation expense	11,462			11,462
Shares issued upon vesting of restricted stock units and for exercises of stock options (in shares)			1,750,521
Shares issued upon vesting of restricted stock units and for exercises of stock options	603			603
Shares issued as payment for services (in shares)			74,771
Shares issued as payment for services	577			577
Shares issued in public offering, net of issuance costs (in shares)			17,250,000
Shares issued in public offerings, net of issuance costs	121,045			121,045
Net income	(67,132)						(67,132)
Other comprehensive loss	(2,482)					(2,482)
Balances (in shares) at Sep. 30, 2021			206,738,499
Balances at Sep. 30, 2021	131,247		$ 0	2,020,254		1,515	(1,890,522)
Balances (in shares) at Dec. 31, 2020			187,663,207
Balances at Dec. 31, 2020	$ 67,174		$ 0	1,886,567		3,997	(1,823,390)
Increase (Decrease) in Stockholders' Equity
Accounting Standards Update [Extensible Enumeration]	Accounting Standards Update 2020-06 [Member]
Balances (in shares) at Dec. 31, 2021	206,739,874		206,739,874
Balances at Dec. 31, 2021	$ 107,348	$ (18,196)	$ 0	2,022,701	$ (36,868)	203	(1,915,556)	$ 18,672
Balances (in shares) at Jun. 30, 2021			206,580,928
Balances at Jun. 30, 2021	159,196		$ 0	2,017,413		2,541	(1,860,758)
Increase (Decrease) in Stockholders' Equity
Stock-based compensation expense	2,490			2,490
Shares issued upon vesting of restricted stock units and for exercises of stock options (in shares)			157,571
Shares issued upon vesting of restricted stock units and for exercises of stock options	351			351
Net income	(29,764)						(29,764)
Other comprehensive loss	(1,026)					(1,026)
Balances (in shares) at Sep. 30, 2021			206,738,499
Balances at Sep. 30, 2021	$ 131,247		$ 0	2,020,254		1,515	(1,890,522)
Balances (in shares) at Dec. 31, 2021	206,739,874		206,739,874
Balances at Dec. 31, 2021	$ 107,348	$ (18,196)	$ 0	2,022,701	$ (36,868)	203	(1,915,556)	$ 18,672
Increase (Decrease) in Stockholders' Equity
Stock-based compensation expense	7,996			7,996
Shares issued upon vesting of restricted stock units and for exercises of stock options (in shares)			354,089
Shares issued upon vesting of restricted stock units and for exercises of stock options	1			1
Shares issued for accrued compensation (in shares)			772,071
Shares issued for accrued compensation	1,698			1,698
Shares issued as payment for services (in shares)			283,987
Shares issued as payment for services	576			576
Net income	50,493						50,493
Other comprehensive loss	$ (7,384)					(7,384)
Balances (in shares) at Sep. 30, 2022	208,150,021		208,150,021
Balances at Sep. 30, 2022	$ 142,532		$ 0	1,996,104		(7,181)	(1,846,391)
Balances (in shares) at Jun. 30, 2022			208,150,021
Balances at Jun. 30, 2022	55,653		$ 0	1,993,979		(4,556)	(1,933,770)
Increase (Decrease) in Stockholders' Equity
Stock-based compensation expense	2,125			2,125
Net income	87,379						87,379
Other comprehensive loss	$ (2,625)					(2,625)
Balances (in shares) at Sep. 30, 2022	208,150,021		208,150,021
Balances at Sep. 30, 2022	$ 142,532		$ 0	$ 1,996,104		$ (7,181)	$ (1,846,391)