CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDER'S EQUITY (DEFICIT) - USD ($) $ in Thousands	Additional Paid-In Capital	Accumulated Other Comprehensive Income (Loss)	Accumulated Earnings (Deficit)	Total
Balance at Dec. 31, 2020	$ 1,463,407	$ (805)	$ (10,782,607)	$ (9,320,005)
Increase (Decrease) in Stockholder's Equity
Non-cash, stock-based compensation	7,676			7,676
Change in unrealized holding gains (losses) on available-for-sale debt securities, net		(2)		(2)
Foreign currency translation		(195)		(195)
Net income (loss)			424,527	424,527
Balance at Mar. 31, 2021	1,471,083	(1,002)	(10,358,080)	(8,887,999)
Balance at Dec. 31, 2021	1,492,174	(1,262)	(9,045,735)	(7,554,823)
Increase (Decrease) in Stockholder's Equity
Non-cash, stock-based compensation	8,383			8,383
Change in unrealized holding gains (losses) on available-for-sale debt securities, net		(76)		(76)
Deferred income tax (expense) benefit attributable to other comprehensive income (loss)		21		21
Foreign currency translation		(187)		(187)
Net income (loss)			444,411	444,411
Other	13			13
Balance at Mar. 31, 2022	$ 1,500,570	$ (1,504)	$ (8,601,324)	$ (7,102,258)