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Marketable Securities and Fair Value Measurements - Estimate of Fair Value of Marketable Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 84,933
Gross Unrealized Gains	144
Gross Unrealized Losses	(8)
Fair Value	85,069	$ 0
Certificates of deposit
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	9,000
Gross Unrealized Gains	2
Gross Unrealized Losses	(1)
Fair Value	9,001
Corporate securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	35,870
Gross Unrealized Gains	103
Gross Unrealized Losses	(7)
Fair Value	35,966
Commercial paper
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	23,392
Gross Unrealized Gains	9
Gross Unrealized Losses	0
Fair Value	23,401
Asset-backed securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	16,671
Gross Unrealized Gains	30
Gross Unrealized Losses	0
Fair Value	$ 16,701

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

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-Publisher FASB
-Name Accounting Standards Codification
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