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Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Income Statement [Abstract]
Revenue	$ 240,569	$ 400,340	$ 644,860	$ 1,183,368
Cost of revenue	143,500	213,710	395,075	638,665
Gross profit	97,069	186,630	249,785	544,703
Operating expenses:
Research and development	96,146	67,372	266,174	175,262
Sales and marketing	91,567	66,427	255,904	186,290
General and administrative	24,945	25,195	74,108	87,109
Total operating expenses	212,658	158,994	596,186	448,661
Operating income (loss)	(115,589)	27,636	(346,401)	96,042
Other expense, net	(808)	(363)	(455)	(2,485)
Income (loss) before income taxes	(116,397)	27,273	(346,856)	93,557
Income tax expense (benefit)	(12,329)	8,474	(43,562)	22,975
Net income (loss)	$ (104,068)	$ 18,799	$ (303,294)	$ 70,582
Net income per share attributable to common stockholders - Basic (in dollars per share)	$ (0.74)	$ 0.14	$ (2.18)	$ 0.53
Net income per share attributable to common stockholders - Diluted (in dollars per share)	$ (0.74)	$ 0.13	$ (2.18)	$ 0.48
Weighted-average shares used to compute net income per share attributable to common stockholders - Basic (in shares)	140,124	135,800	138,875	133,755
Weighted-average shares used to compute net income per share attributable to common stockholders - Diluted (in shares)	140,124	146,055	138,875	147,201

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