CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Loss	Accumulated Deficit	Total
Balances at Dec. 31, 2019	$ 216	$ 4,044,490	$ (15,542)	$ (1,430,758)	$ 2,598,406
Increase (Decrease) in Stockholders' Equity
Issuance of shares of Common Stock upon exercise of stock options and settlement of employee restricted stock units	1	14,618			14,619
Issuance of shares of Common Stock for services rendered		145			145
Stock compensation		42,758			42,758
Other comprehensive income (loss)			2,435		2,435
Net income (loss)				(720,642)	(720,642)
Balances at Mar. 31, 2020	217	4,102,011	(13,107)	(2,151,400)	1,937,721
Balances at Dec. 31, 2020	219	4,352,864	(15,360)	(1,726,455)	2,611,268	[1]
Increase (Decrease) in Stockholders' Equity
Issuance of shares of Common Stock upon exercise of stock options and settlement of employee restricted stock units	1	20,027			20,028
Issuance of shares of Common Stock for services rendered		108			108
Stock compensation		47,903			47,903
Other comprehensive income (loss)			(4,998)		(4,998)
Net income (loss)				53,535	53,535
Balances at Mar. 31, 2021	$ 220	$ 4,420,902	$ (20,358)	$ (1,672,920)	$ 2,727,844

[1] The condensed consolidated balance sheet at December 31, 2020 has been derived from the audited consolidated financial statements at that date.