CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (Unaudited) - 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 Deficit	Accumulated Deficit Cumulative Effect, Period of Adoption, Adjustment	Treasury Stock
Increase (Decrease) in Stockholders' Equity
Beginning balance, treasury (in shares)								2,641,000
Beginning balance at Dec. 31, 2020	$ 364,761		$ 158	$ 1,188,673		$ (640,909)		$ (183,161)
Beginning balance, common (in shares) at Dec. 31, 2020			15,766,000
Increase (Decrease) in Stockholders' Equity
Net income (loss)	19,049					19,049
Comprehensive income (loss)	19,049					19,049
Non-cash compensation	16,436			16,436
Issuance of common stock for stock options, employee stock purchase plan, restricted stock awards and restricted stock units, net of withholding taxes and cancellations	(4,801)			(4,801)
Issuance of common stock for stock options, employee stock purchase plan, restricted stock awards and restricted stock units, net of withholding taxes and cancellations (in shares)			31,000
Other	(2)			(2)
Ending balance at Mar. 31, 2021	395,443		$ 158	1,200,306		(621,860)		$ (183,161)
Ending balance, common (in shares) at Mar. 31, 2021			15,797,000
Ending balance, treasury (in shares) at Mar. 31, 2021								2,641,000
Beginning balance at Dec. 31, 2020	364,761		$ 158	1,188,673		(640,909)		$ (183,161)
Beginning balance, common (in shares) at Dec. 31, 2020			15,766,000
Increase (Decrease) in Stockholders' Equity
Net income (loss)	21,190
Comprehensive income (loss)	21,190
Ending balance at Sep. 30, 2021	431,082		$ 160	1,233,802		(619,719)		$ (183,161)
Ending balance, common (in shares) at Sep. 30, 2021			15,969,000
Ending balance, treasury (in shares) at Sep. 30, 2021								2,641,000
Beginning balance at Dec. 31, 2020	364,761		$ 158	1,188,673		(640,909)		$ (183,161)
Beginning balance, common (in shares) at Dec. 31, 2020			15,766,000
Ending balance at Dec. 31, 2021	$ 447,992	$ (65,303)	$ 161	1,242,794	$ (109,750)	(571,794)	$ 44,447	$ (223,169)
Ending balance, common (in shares) at Dec. 31, 2021	13,095,149		16,071,000
Ending balance, treasury (in shares) at Dec. 31, 2021								2,976,000
Increase (Decrease) in Stockholders' Equity
Accounting Standards Update [Extensible Enumeration]	Accounting Standards Update 2020-06 [Member]
Beginning balance, treasury (in shares)								2,641,000
Beginning balance at Mar. 31, 2021	$ 395,443		$ 158	1,200,306		(621,860)		$ (183,161)
Beginning balance, common (in shares) at Mar. 31, 2021			15,797,000
Increase (Decrease) in Stockholders' Equity
Net income (loss)	6,601					6,601
Comprehensive income (loss)	6,601					6,601
Non-cash compensation	18,294			18,294
Issuance of common stock for stock options, employee stock purchase plan, restricted stock awards and restricted stock units, net of withholding taxes and cancellations	30		$ 2	28
Issuance of common stock for stock options, employee stock purchase plan, restricted stock awards and restricted stock units, net of withholding taxes and cancellations (in shares)			159,000
Ending balance at Jun. 30, 2021	420,368		$ 160	1,218,628		(615,259)		$ (183,161)
Ending balance, common (in shares) at Jun. 30, 2021			15,956,000
Ending balance, treasury (in shares) at Jun. 30, 2021								2,641,000
Increase (Decrease) in Stockholders' Equity
Beginning balance, treasury (in shares)								2,641,000
Net income (loss)	(4,460)					(4,460)
Comprehensive income (loss)	(4,460)					(4,460)
Non-cash compensation	17,074			17,074
Issuance of common stock for stock options, employee stock purchase plan, restricted stock awards and restricted stock units, net of withholding taxes and cancellations	(1,894)			(1,894)
Issuance of common stock for stock options, employee stock purchase plan, restricted stock awards and restricted stock units, net of withholding taxes and cancellations (in shares)			13,000
Other	(6)			(6)
Ending balance at Sep. 30, 2021	431,082		$ 160	1,233,802		(619,719)		$ (183,161)
Ending balance, common (in shares) at Sep. 30, 2021			15,969,000
Ending balance, treasury (in shares) at Sep. 30, 2021								2,641,000
Increase (Decrease) in Stockholders' Equity
Beginning balance, treasury (in shares)								2,641,000
Beginning balance, treasury (in shares)								2,976,000
Beginning balance at Dec. 31, 2021	$ 447,992	(65,303)	$ 161	1,242,794	(109,750)	(571,794)	44,447	$ (223,169)
Beginning balance, common (in shares) at Dec. 31, 2021	13,095,149		16,071,000
Increase (Decrease) in Stockholders' Equity
Net income (loss)	$ (10,826)					(10,826)
Comprehensive income (loss)	(10,826)					(10,826)
Non-cash compensation	15,080			15,080
Purchase of treasury stock	(43,009)							$ (43,009)
Purchase of treasury stock (in shares)								379,000
Issuance of common stock for stock options, employee stock purchase plan, restricted stock awards and restricted stock units, net of withholding taxes and cancellations	(3,086)			(3,086)
Issuance of common stock for stock options, employee stock purchase plan, restricted stock awards and restricted stock units, net of withholding taxes and cancellations (in shares)			49,000
Ending balance at Mar. 31, 2022	340,848		$ 161	1,145,038		(538,173)		$ (266,178)
Ending balance, common (in shares) at Mar. 31, 2022			16,120,000
Ending balance, treasury (in shares) at Mar. 31, 2022								3,355,000
Beginning balance at Dec. 31, 2021	$ 447,992	$ (65,303)	$ 161	1,242,794	$ (109,750)	(571,794)	$ 44,447	$ (223,169)
Beginning balance, common (in shares) at Dec. 31, 2021	13,095,149		16,071,000
Increase (Decrease) in Stockholders' Equity
Net income (loss)	$ (177,548)
Comprehensive income (loss)	$ (177,548)
Purchase of treasury stock (in shares)	379,895
Ending balance at Sep. 30, 2022	$ 206,497		$ 161	1,177,409		(704,895)		$ (266,178)
Ending balance, common (in shares) at Sep. 30, 2022	12,784,637		16,140,000
Ending balance, treasury (in shares) at Sep. 30, 2022								3,355,000
Increase (Decrease) in Stockholders' Equity
Beginning balance, treasury (in shares)								3,355,000
Beginning balance at Mar. 31, 2022	$ 340,848		$ 161	1,145,038		(538,173)		$ (266,178)
Beginning balance, common (in shares) at Mar. 31, 2022			16,120,000
Increase (Decrease) in Stockholders' Equity
Net income (loss)	(8,038)					(8,038)
Comprehensive income (loss)	(8,038)					(8,038)
Non-cash compensation	17,335			17,335
Issuance of common stock for stock options, employee stock purchase plan, restricted stock awards and restricted stock units, net of withholding taxes and cancellations	341			341
Issuance of common stock for stock options, employee stock purchase plan, restricted stock awards and restricted stock units, net of withholding taxes and cancellations (in shares)			21,000
Ending balance at Jun. 30, 2022	350,486		$ 161	1,162,714		(546,211)		$ (266,178)
Ending balance, common (in shares) at Jun. 30, 2022			16,141,000
Ending balance, treasury (in shares) at Jun. 30, 2022								3,355,000
Increase (Decrease) in Stockholders' Equity
Beginning balance, treasury (in shares)								3,355,000
Net income (loss)	(158,684)					(158,684)
Comprehensive income (loss)	(158,684)					(158,684)
Non-cash compensation	15,575			15,575
Issuance of common stock for stock options, employee stock purchase plan, restricted stock awards and restricted stock units, net of withholding taxes and cancellations	(880)			(880)
Issuance of common stock for stock options, employee stock purchase plan, restricted stock awards and restricted stock units, net of withholding taxes and cancellations (in shares)			(1,000)
Ending balance at Sep. 30, 2022	$ 206,497		$ 161	$ 1,177,409		$ (704,895)		$ (266,178)
Ending balance, common (in shares) at Sep. 30, 2022	12,784,637		16,140,000
Ending balance, treasury (in shares) at Sep. 30, 2022								3,355,000
Increase (Decrease) in Stockholders' Equity
Beginning balance, treasury (in shares)								3,355,000