Consolidated Statements of Stockholders' Equity (Deficit) - USD ($) shares in Thousands, $ in Thousands	Total	Class A and Class B Common Stock	Additional Paid-In Capital	Accumulated Deficit	Accumulated Other Comprehensive (Loss) Income
Beginning balance (in shares) at Dec. 31, 2016		85,831
Beginning balance at Dec. 31, 2016	$ 79,384	$ 86	$ 409,225	$ (329,940)	$ 13
Increase (Decrease) in Stockholders' Equity
Net loss	(244,614)			(244,614)
Other comprehensive income	(2,376)				(2,376)
Exercise of options to purchase common stock (in shares)		84
Exercise of options to purchase common stock	244		244
Issuance of common stock upon vesting of RSUs (in shares)		2,327
Issuance of common stock upon vesting of RSUs	2	$ 2
Shares withheld related to net settlement of RSUs (in shares)		(33)
Shares withheld related to net settlement of RSUs	(1,562)		(1,562)
Equity-based compensation expense	71,380		71,380
Equity component of issuance of convertible notes and capped calls, net (Note 15)	49,213		49,213
Ending balance (in shares) at Dec. 31, 2017		88,209
Ending balance at Dec. 31, 2017	(48,329)	$ 88	537,212	(583,266)	(2,363)
Increase (Decrease) in Stockholders' Equity
Net loss	(504,080)			(504,080)
Other comprehensive income	583				583
Exercise of options to purchase common stock (in shares)		46
Exercise of options to purchase common stock	138		138
Issuance of common stock upon vesting of RSUs (in shares)		2,504
Issuance of common stock upon vesting of RSUs	3	$ 3
Shares withheld related to net settlement of RSUs (in shares)		(11)
Shares withheld related to net settlement of RSUs	(1,284)		(1,284)
Equity-based compensation expense	133,638		133,638
Equity component of issuance of convertible notes and capped calls, net (Note 15)	83,953		83,953
Ending balance (in shares) at Dec. 31, 2018		90,748
Ending balance at Dec. 31, 2018	(330,721)	$ 91	753,657	(1,082,689)	(1,780)
Increase (Decrease) in Stockholders' Equity
Net loss	(984,584)			(984,584)
Other comprehensive income	353				353
Exercise of options to purchase common stock (in shares)		35
Exercise of options to purchase common stock	113		113
Issuance of common stock upon vesting of RSUs (in shares)		2,836
Issuance of common stock upon vesting of RSUs	3	$ 3
Shares withheld related to net settlement of RSUs (in shares)		(19)
Shares withheld related to net settlement of RSUs	(2,236)		(2,236)
Equity-based compensation expense	240,448		240,448
Equity component of issuance of convertible notes and capped calls, net (Note 15)	130,566		130,566
Ending balance (in shares) at Dec. 31, 2019		93,600
Ending balance at Dec. 31, 2019	$ (944,208)	$ 94	$ 1,122,548	$ (2,065,423)	$ (1,427)