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Marketable Securities and Fair Value Measurements - Estimate of Fair Value of Marketable Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 83,991	$ 85,417
Gross Unrealized Gains	18	19
Gross Unrealized Losses	(36)	(64)
Fair Value	83,973	85,372
Certificates of deposit
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	15,990	12,499
Gross Unrealized Gains	4	9
Gross Unrealized Losses	(1)	0
Fair Value	15,993	12,508
Corporate securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	40,941	42,765
Gross Unrealized Gains	12	9
Gross Unrealized Losses	(13)	(42)
Fair Value	40,940	42,732
U.S. Treasury and agency securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	3,494	5,190
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(12)	(14)
Fair Value	3,482	5,176
Commercial paper
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	9,214	11,470
Gross Unrealized Gains	2	1
Gross Unrealized Losses	0	(2)
Fair Value	9,216	11,469
Asset-backed securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	14,352	13,493
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(10)	(6)
Fair Value	$ 14,342	$ 13,487

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