Stockholders' Equity (Details) - RSU [Member] $ / shares in Units, $ in Thousands	6 Months Ended
	Jun. 30, 2016 USD ($) $ / shares shares
Summary of RSU activity
Number of Shares, Unvested-December 31, 2015	6,136,702
Number of Shares, Assumed From Acquisition	42,157
Number of Shares, Granted	3,146,105
Number of Shares, Released	(1,375,535)
Number of Shares, Forfeited	(419,060)
Number of Shares, Unvested - June 30, 2016	7,530,369
Number of Shares, Expected to Vest as of June 30, 2016	6,574,470.00
Summary of RSU weighted average grant date fair value (in dollars per share)
Weighted-Average Grant Date Fair Value, Unvested-December 31, 2015 | $ / shares	$ 211.77
Weighted-average Grant Date Fair Value, Assumed From Acquisition | $ / shares	114.12
Weighted-average Grant Date Fair Value, Granted | $ / shares	116.84
Weighted-Average Grant Date Fair Value, Released | $ / shares	191.45
Weighted-Average Grant Date Fair Value, Forfeited | $ / shares	201.09
Weighted-Average Grant Date Fair Value, Unvested-June 30, 2016 | $ / shares	$ 175.87
Aggregate Intrinsic Value, Unvested During Period | $	$ 1,425,122
Aggregate Intrinsic Value, Expected to Vest | $	$ 1,244,218