CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Cumulative effect adjustment	Common Stock	Additional Paid-in Capital	Additional Paid-in Capital Cumulative effect adjustment	Accumulated Deficit	Accumulated Deficit Cumulative effect adjustment	Treasury Stock
Beginning balance at Dec. 31, 2019	$ 402,326		$ 157	$ 1,177,984		$ (592,654)		$ (183,161)
Beginning balance, common (in shares) at Dec. 31, 2019			15,677,000
Beginning balance, treasury (in shares) at Dec. 31, 2019								2,641,000
Increase (Decrease) in Stockholders' Equity
Net income (loss)	(48,255)					(48,255)
Comprehensive income (loss)	(48,255)
Non-cash compensation	$ 53,733			53,733
Purchase of treasury stock (in shares)	0
Issuance of common stock for stock options, employee stock purchase plan, restricted stock awards and restricted stock units, net of withholding taxes	$ (3,910)		$ 1	(3,911)
Issuance of common stock for stock options, employee stock purchase plan, restricted stock awards and restricted stock units, net of withholding taxes (in shares)			89,000
Issuance of 0.50% Convertible Senior Notes, net	116,300			116,300
Repurchase of 0.625% Convertible Senior Notes, net	(107,882)			(107,882)
Convertible note hedge transactions	(14,379)			(14,379)
Warrant transactions	(33,171)			(33,171)
Other	(1)			(1)
Ending balance at Dec. 31, 2020	364,761		$ 158	1,188,673		(640,909)		$ (183,161)
Ending balance, common (in shares) at Dec. 31, 2020			15,766,000
Ending balance, treasury (in shares) at Dec. 31, 2020								2,641,000
Increase (Decrease) in Stockholders' Equity
Net income (loss)	69,115					69,115
Comprehensive income (loss)	69,115
Non-cash compensation	68,555			68,555
Purchase of treasury stock	$ (40,008)							$ (40,008)
Purchase of treasury stock (in shares)	334,253							335,000
Issuance of common stock for stock options, employee stock purchase plan, restricted stock awards and restricted stock units, net of withholding taxes	$ (14,423)		$ 3	(14,426)
Issuance of common stock for stock options, employee stock purchase plan, restricted stock awards and restricted stock units, net of withholding taxes (in shares)			305,000
Other	(8)			(8)
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	2,975,571							2,976,000
Increase (Decrease) in Stockholders' Equity
Accounting Standards Update [Extensible Enumeration]	Accounting Standards Update 2020-06 [Member]
Net income (loss)	$ (187,952)					(187,952)
Comprehensive income (loss)	(187,952)
Non-cash compensation	59,624			59,624
Purchase of treasury stock	$ (43,009)							$ (43,009)
Purchase of treasury stock (in shares)	379,895							379,000
Issuance of common stock for stock options, employee stock purchase plan, restricted stock awards and restricted stock units, net of withholding taxes	$ (3,412)		$ 1	(3,413)
Issuance of common stock for stock options, employee stock purchase plan, restricted stock awards and restricted stock units, net of withholding taxes (in shares)			96,000
Ending balance at Dec. 31, 2022	$ 207,940		$ 162	$ 1,189,255		$ (715,299)		$ (266,178)
Ending balance, common (in shares) at Dec. 31, 2022	12,811,718		16,167,000
Ending balance, treasury (in shares) at Dec. 31, 2022	3,355,466							3,355,000