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Fair Value Measurements - Recurring Basis (Details) $ in Thousands, item in Millions | 9 Months Ended |
--- | --- | ---
Sep. 30, 2018 USD ($) item | Dec. 31, 2017 USD ($)
Financial Assets |  |
Marketable securities | $ 340,918 | $ 329,139
Transfers between levels | item | 0.0 |
Government agency securities |  |
Financial Assets |  |
Marketable securities | $ 29,907 | 58,950
Corporate equity securities |  |
Financial Assets |  |
Amortized Cost | 3,667 |
Money market funds |  |
Financial Assets |  |
Marketable securities | 106,974 | 134,635
U.S. Treasuries |  |
Financial Assets |  |
Marketable securities | 200,370 | 135,554
Recurring |  |
Financial Assets |  |
Total financial assets | 342,537 | 330,758
Recurring | U.S. Treasuries |  |
Financial Assets |  |
Marketable securities | 195,885 | 123,559
Recurring | Government agency securities |  |
Financial Assets |  |
Marketable securities | 29,907 | 58,950
Recurring | Corporate equity securities |  |
Financial Assets |  |
Amortized Cost | 3,667 |
Recurring | Money market funds |  |
Financial Assets |  |
Cash and cash equivalents | 106,974 | 134,635
Restricted cash | 1,619 | 1,619
Recurring | U.S. Treasuries |  |
Financial Assets |  |
Cash and cash equivalents | 4,485 | 11,995
Recurring | Level 1 |  |
Financial Assets |  |
Total financial assets | 338,870 | 330,758
Recurring | Level 1 | U.S. Treasuries |  |
Financial Assets |  |
Marketable securities | 195,885 | 123,559
Recurring | Level 1 | Government agency securities |  |
Financial Assets |  |
Marketable securities | 29,907 | 58,950
Recurring | Level 1 | Money market funds |  |
Financial Assets |  |
Cash and cash equivalents | 106,974 | 134,635
Restricted cash | 1,619 | 1,619
Recurring | Level 1 | U.S. Treasuries |  |
Financial Assets |  |
Cash and cash equivalents | 4,485 | $ 11,995
Recurring | Level 2 |  |
Financial Assets |  |
Total financial assets | 3,667 |
Recurring | Level 2 | Corporate equity securities |  |
Financial Assets |  |
Amortized Cost | $ 3,667 |

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