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Marketable Securities and Fair Value Measurements - Estimate of Fair Value of Marketable Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 85,641	$ 85,417
Gross Unrealized Gains	14	19
Gross Unrealized Losses	(60)	(64)
Fair Value	85,595	85,372
Certificates of deposit
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	11,500	12,499
Gross Unrealized Gains	6	9
Gross Unrealized Losses	(7)	0
Fair Value	11,499	12,508
Corporate securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	48,433	42,765
Gross Unrealized Gains	8	9
Gross Unrealized Losses	(32)	(42)
Fair Value	48,409	42,732
U.S. Treasury and agency securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	5,191	5,190
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(10)	(14)
Fair Value	5,181	5,176
Commercial paper
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	7,977	11,470
Gross Unrealized Gains	0	1
Gross Unrealized Losses	0	(2)
Fair Value	7,977	11,469
Asset-backed securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	12,540	13,493
Gross Unrealized Gains		0
Gross Unrealized Losses	(11)	(6)
Fair Value	$ 12,529	$ 13,487

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