Unaudited Condensed Consolidated Statements of Changes in Stockholders' Deficit - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid-In Capital [Member]	Accumulated Deficit [Member]	Treasury Stock, at Cost [Member]
Beginning Balance at Dec. 31, 2020	$ (105,803)	$ 946	$ 680,360	$ (371,800)	$ (415,309)
Beginning Balance, shares at Dec. 31, 2020		94,652,248
Equity-based compensation	4,473		4,473
Vesting of restricted shares		$ 1	(1)
Vesting of restricted shares, shares		130,834
Shares withheld for tax withholdings	(1,971)		(1,971)
Shares withheld for tax withholdings, shares		(41,271)
Exercise of stock options	2,393	$ 1	2,392
Exercise of stock options, shares		116,634
Net loss	(44,884)			(44,884)
Ending Balance at Mar. 31, 2021	(145,792)	$ 948	685,253	(416,684)	(415,309)
Ending Balance, shares at Mar. 31, 2021		94,858,445
Beginning Balance at Dec. 31, 2021	$ (33,916)	$ 955	711,474	(115,287)	(631,058)
Beginning Balance, shares at Dec. 31, 2021	95,541,992	95,541,992
Equity-based compensation	$ 6,982		6,982
Vesting of restricted shares		$ 4	(4)
Vesting of restricted shares, shares		361,403
Shares withheld for tax withholdings	(7,738)	$ (1)	(7,737)
Shares withheld for tax withholdings, shares		(111,865)
Exercise of stock options	1,127		1,127
Exercise of stock options, shares		46,503
Repurchase of treasury shares	(109,905)				(109,905)
Net loss	(8,987)			(8,987)
Ending Balance at Mar. 31, 2022	$ (152,437)	$ 958	$ 711,842	$ (124,274)	$ (740,963)
Ending Balance, shares at Mar. 31, 2022	95,838,033	95,838,033