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Investments and Fair Value Measurements - Schedule of Marketable Investments (Details) $ in Thousands | 6 Months Ended
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Jun. 30, 2018 USD ($)
Debt Securities, Available-for-sale [Line Items] |
Cost | $ 108,149
Gross Unrealized Gains | 8
Gross Unrealized Losses | (17)
Fair Value | 108,140
Certificates of deposit |
Debt Securities, Available-for-sale [Line Items] |
Cost | 4,156
Gross Unrealized Gains | 1
Gross Unrealized Losses | 0
Fair Value | 4,157
U.S. treasury |
Debt Securities, Available-for-sale [Line Items] |
Cost | 989
Gross Unrealized Gains | 0
Gross Unrealized Losses | 0
Fair Value | 989
U.S. agency securities and government sponsored securities |
Debt Securities, Available-for-sale [Line Items] |
Cost | 94,879
Gross Unrealized Gains | 7
Gross Unrealized Losses | (16)
Fair Value | 94,870
Commercial paper |
Debt Securities, Available-for-sale [Line Items] |
Cost | 3,131
Gross Unrealized Gains | 0
Gross Unrealized Losses | 0
Fair Value | 3,131
Corporate bonds |
Debt Securities, Available-for-sale [Line Items] |
Cost | 4,994
Gross Unrealized Gains | 0
Gross Unrealized Losses | (1)
Fair Value | $ 4,993

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