Condensed Unaudited Consolidated Statements of Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands	Total	Preferred Stock	Common Stock	Additional paid-in capital	Accumulated Deficit	Accumulated Other Comprehensive Income (Loss)
Balance at beginning of period (in shares) at Dec. 31, 2020		0	90,121
Beginning balance at Dec. 31, 2020	$ 191,563	$ 0	$ 90	$ 756,543	$ (565,073)	$ 3
Increase (Decrease) in Stockholders' Equity
Issuance of common stock under employee stock compensation plan (in shares)			49
Issuance of common stock under employee stock compensation plans	129			129
Share-based compensation	2,292			2,292
Net loss	(26,795)				(26,795)
Unrealized loss on available for sale securities, net of tax	(1)					(1)
Balance at end of period (in shares) at Mar. 31, 2021		0	90,170
Ending balance at Mar. 31, 2021	167,188	$ 0	$ 90	758,964	(591,868)	2
Balance at beginning of period (in shares) at Dec. 31, 2020		0	90,121
Beginning balance at Dec. 31, 2020	191,563	$ 0	$ 90	756,543	(565,073)	3
Increase (Decrease) in Stockholders' Equity
Net loss	(56,938)
Balance at end of period (in shares) at Jun. 30, 2021		0	90,387
Ending balance at Jun. 30, 2021	139,573	$ 0	$ 90	761,491	(622,011)	3
Balance at beginning of period (in shares) at Mar. 31, 2021		0	90,170
Beginning balance at Mar. 31, 2021	167,188	$ 0	$ 90	758,964	(591,868)	2
Increase (Decrease) in Stockholders' Equity
Issuance of common stock under employee stock compensation plan (in shares)			217
Issuance of common stock under employee stock compensation plans	448			448
Share-based compensation	2,079			2,079
Net loss	(30,143)				(30,143)
Unrealized loss on available for sale securities, net of tax	1					1
Balance at end of period (in shares) at Jun. 30, 2021		0	90,387
Ending balance at Jun. 30, 2021	139,573	$ 0	$ 90	761,491	(622,011)	3
Balance at beginning of period (in shares) at Dec. 31, 2021		0	115,277
Beginning balance at Dec. 31, 2021	360,528	$ 0	$ 115	1,040,098	(679,595)	(90)
Increase (Decrease) in Stockholders' Equity
Issuance of common stock under employee stock compensation plan (in shares)			697
Issuance of common stock under employee stock compensation plans	2,080		$ 1	2,079
Share-based compensation	5,386			5,386
Net loss	(34,536)				(34,536)
Unrealized loss on available for sale securities, net of tax	(304)					(304)
Balance at end of period (in shares) at Mar. 31, 2022		0	115,974
Ending balance at Mar. 31, 2022	333,154	$ 0	$ 116	1,047,563	(714,131)	(394)
Balance at beginning of period (in shares) at Dec. 31, 2021		0	115,277
Beginning balance at Dec. 31, 2021	360,528	$ 0	$ 115	1,040,098	(679,595)	(90)
Increase (Decrease) in Stockholders' Equity
Net loss	(83,799)
Balance at end of period (in shares) at Jun. 30, 2022		0	116,874
Ending balance at Jun. 30, 2022	292,946	$ 0	$ 117	1,056,751	(763,394)	(528)
Balance at beginning of period (in shares) at Mar. 31, 2022		0	115,974
Beginning balance at Mar. 31, 2022	333,154	$ 0	$ 116	1,047,563	(714,131)	(394)
Increase (Decrease) in Stockholders' Equity
Issuance of common stock under employee stock compensation plan (in shares)			900
Issuance of common stock under employee stock compensation plans	2,801		$ 1	2,800
Share-based compensation	6,388			6,388
Net loss	(49,263)				(49,263)
Unrealized loss on available for sale securities, net of tax	(134)					(134)
Balance at end of period (in shares) at Jun. 30, 2022		0	116,874
Ending balance at Jun. 30, 2022	$ 292,946	$ 0	$ 117	$ 1,056,751	$ (763,394)	$ (528)