CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands		Total		Common Stock	Additional Paid-in Capital	Company Common Stock Held By The NQDC	Accumulated Other Comprehensive Income (Loss)	Accumulated Deficit
Beginning Balance at Dec. 31, 2016							$ 12,816
Net loss		$ (65,650)
Ending Balance at Sep. 30, 2017							(21,434)
Beginning Balance at Jun. 30, 2017							(14,658)
Net loss		(12,527)
Ending Balance at Sep. 30, 2017							(21,434)
Beginning Balance at Dec. 31, 2017		2,808,663	[1]	$ 176	$ 4,483,220	$ (14,224)	(22,961)	$ (1,637,548)
Beginning Balance (in shares) at Dec. 31, 2017				175,844
Impact of change in accounting principle at Dec. 31, 2017	[2]						(586)
Impact of change in accounting principle (ASC 606) at Dec. 31, 2017		20,048						20,048
Impact of change in accounting principle (ASU 2018-02) at Dec. 31, 2017							(586)	586
Adjusted balance at January 1, 2018 at Dec. 31, 2017		2,828,711		$ 176	4,483,220	(14,224)	(23,547)	(1,616,914)
Net loss		(73,561)						(73,561)
Other comprehensive income		21,387					21,387
Issuances under equity incentive plans, net of tax		21,463		$ 2	21,461
Issuances under equity incentive plans, net of tax (in share)				2,059
Common stock held by the NQDC		809				809
Stock-based compensation		116,136			116,136
Ending Balance at Sep. 30, 2018		2,914,945		$ 178	4,620,817	(13,415)	(2,160)	(1,690,475)
Ending Balance (in shares) at Sep. 30, 2018				177,903
Beginning Balance at Jun. 30, 2018							(1,129)
Net loss		(12,620)
Ending Balance at Sep. 30, 2018		$ 2,914,945		$ 178	$ 4,620,817	$ (13,415)	$ (2,160)	$ (1,690,475)
Ending Balance (in shares) at Sep. 30, 2018				177,903

[1] December 31, 2017 balances were derived from the audited Consolidated Financial Statements included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2017, filed with the SEC on February 26, 2018.

[2] As of January 1, 2018, the Company early adopted the requirements of ASU 2018-02. The amount represents the reclassification from Accumulated Other Comprehensive Income (Loss) to Accumulated Deficit in the first quarter of 2018 related to the adoption of ASU 2018-02. See Note 4 for additional discussion