Available-for-Sale Securities and Fair Value Measurements (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Marketable securities
Marketable securities (including commercial paper classified as cash equivalents)	$ 571,554	$ 171,713
Amortized Cost	571,807	171,784
Gross Unrealized Gains	52	6
Gross Unrealized Losses	(305)	(77)
Available-for-sale securities sold	$ 0	0	$ 900
Maturity period for marketable securities
Maximum contractual maturity period	2 years
Weighted average contractual maturity period	10 months
Fair value transfers
Fair value of assets transferred from Level 1 to Level 2	$ 0	0
Fair value of assets transferred from Level 2 to Level 1	0	0
Fair value of liabilities transferred from Level1 to Level2	0	0
Fair value of liabilities transferred from Level 2 to Level 1	0	0
Cash equivalents
Marketable securities
Marketable securities (including commercial paper classified as cash equivalents)	323,602	69,126
Short-term marketable securities
Marketable securities
Marketable securities (including commercial paper classified as cash equivalents)	156,387	59,727
Long-term marketable securities
Marketable securities
Marketable securities (including commercial paper classified as cash equivalents)	91,565	42,860
Marketable securities
Marketable securities
Marketable securities (including commercial paper classified as cash equivalents)	247,952	102,587
Amortized Cost	248,205	102,658
Gross Unrealized Gains	52	6
Gross Unrealized Losses	(305)	(77)
U.S. government securities \| Level 1
Marketable securities
Marketable securities (including commercial paper classified as cash equivalents)	69,955	47,043
Amortized Cost	69,963	47,068
Gross Unrealized Gains	39	4
Gross Unrealized Losses	(47)	(29)
U.S. government agencies securities \| Level 2
Marketable securities
Marketable securities (including commercial paper classified as cash equivalents)	60,747	31,465
Amortized Cost	60,783	31,502
Gross Unrealized Gains	9
Gross Unrealized Losses	(45)	(37)
Corporate notes \| Level 2
Marketable securities
Marketable securities (including commercial paper classified as cash equivalents)	98,313	19,089
Amortized Cost	98,522	19,098
Gross Unrealized Gains	4	2
Gross Unrealized Losses	(213)	(11)
Commercial paper \| Level 2
Marketable securities
Marketable securities (including commercial paper classified as cash equivalents)	18,937	4,990
Amortized Cost	18,937	4,990
Gross Unrealized Gains	0
Gross Unrealized Losses	0	0
Money market funds \| Level 1
Marketable securities
Marketable securities (including commercial paper classified as cash equivalents)	323,602	69,126
Amortized Cost	323,602	69,126
Gross Unrealized Gains	0
Gross Unrealized Losses	$ 0	$ 0

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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