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Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Assets: |  |
Securities | $ 91,820 |
Other assets | 43,785 | $ 6,294
Fair Value Measurements, Recurring Basis |  |
Assets: |  |
Cash and cash equivalents | 69,100 | 146,200
Total assets measured at fair value | 183,302 | 160,849
Other assets | 22,400 | 1,900
Fair Value Measurements, Recurring Basis | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Assets: |  |
Total assets measured at fair value | 55,663 | 46,257
Fair Value Measurements, Recurring Basis | Significant Other Observable Inputs (Level 2) |  |
Assets: |  |
Total assets measured at fair value | 105,283 | 112,702
Fair Value Measurements, Recurring Basis | Significant Unobservable Inputs (Level 3) |  |
Assets: |  |
Total assets measured at fair value | 22,356 | 1,890
Fair Value Measurements, Recurring Basis | Money market funds |  |
Assets: |  |
Cash and cash equivalents | 55,663 | 46,257
Fair Value Measurements, Recurring Basis | Money market funds | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Assets: |  |
Cash and cash equivalents | 55,663 | 46,257
Fair Value Measurements, Recurring Basis | Money market funds | Significant Other Observable Inputs (Level 2) |  |
Assets: |  |
Cash and cash equivalents | 0 | 0
Fair Value Measurements, Recurring Basis | Money market funds | Significant Unobservable Inputs (Level 3) |  |
Assets: |  |
Cash and cash equivalents | 0 | 0
Fair Value Measurements, Recurring Basis | U.S. Treasury securities |  |
Assets: |  |
Securities |  | 12,488
Fair Value Measurements, Recurring Basis | U.S. Treasury securities | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Assets: |  |
Securities |  | 0
Fair Value Measurements, Recurring Basis | U.S. Treasury securities | Significant Other Observable Inputs (Level 2) |  |
Assets: |  |
Securities |  | 12,488
Fair Value Measurements, Recurring Basis | U.S. Treasury securities | Significant Unobservable Inputs (Level 3) |  |
Assets: |  |
Securities |  | 0
Fair Value Measurements, Recurring Basis | Government-sponsored enterprises |  |
Assets: |  |
Securities | 20,927 |
Fair Value Measurements, Recurring Basis | Government-sponsored enterprises | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Assets: |  |
Securities | 0 |
Fair Value Measurements, Recurring Basis | Government-sponsored enterprises | Significant Other Observable Inputs (Level 2) |  |
Assets: |  |
Securities | 20,927 |
Fair Value Measurements, Recurring Basis | Government-sponsored enterprises | Significant Unobservable Inputs (Level 3) |  |
Assets: |  |
Securities | 0 |
Fair Value Measurements, Recurring Basis | Corporate debt securities |  |
Assets: |  |
Securities | 84,356 | 100,214
Fair Value Measurements, Recurring Basis | Corporate debt securities | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Assets: |  |
Securities | 0 | 0
Fair Value Measurements, Recurring Basis | Corporate debt securities | Significant Other Observable Inputs (Level 2) |  |
Assets: |  |
Securities | 84,356 | 100,214
Fair Value Measurements, Recurring Basis | Corporate debt securities | Significant Unobservable Inputs (Level 3) |  |
Assets: |  |
Securities | 0 | 0
Fair Value Measurements, Recurring Basis | Common stock warrants |  |
Assets: |  |
Securities | 22,356 | 1,890
Fair Value Measurements, Recurring Basis | Common stock warrants | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Assets: |  |
Securities | 0 | 0
Fair Value Measurements, Recurring Basis | Common stock warrants | Significant Other Observable Inputs (Level 2) |  |
Assets: |  |
Securities | 0 | 0
Fair Value Measurements, Recurring Basis | Common stock warrants | Significant Unobservable Inputs (Level 3) |  |
Assets: |  |
Securities | $ 22,356 | $ 1,890

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