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Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Assets: |  |
Securities | $ 86,276 |
Other assets | 25,252 | $ 6,294
Fair Value Measurements, Recurring Basis |  |
Assets: |  |
Cash and cash equivalents | 78,300 | 146,200
Total assets measured at fair value | 176,127 | 160,849
Other assets |  | 1,900
Fair Value Measurements, Recurring Basis | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Assets: |  |
Total assets measured at fair value | 78,868 | 46,257
Fair Value Measurements, Recurring Basis | Significant Other Observable Inputs (Level 2) |  |
Assets: |  |
Total assets measured at fair value | 97,259 | 112,702
Fair Value Measurements, Recurring Basis | Significant Unobservable Inputs (Level 3) |  |
Assets: |  |
Total assets measured at fair value | 0 | 1,890
Fair Value Measurements, Recurring Basis | Money market funds |  |
Assets: |  |
Cash and cash equivalents | 67,321 | 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 | 67,321 | 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 | 11,695 |
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 | 11,695 |
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 | 85,564 | 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 | 85,564 | 100,214
Fair Value Measurements, Recurring Basis | Corporate debt securities | Significant Unobservable Inputs (Level 3) |  |
Assets: |  |
Securities | 0 | 0
Fair Value Measurements, Recurring Basis | Corporate equity securities |  |
Assets: |  |
Securities | 11,547 |
Fair Value Measurements, Recurring Basis | Corporate equity securities | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Assets: |  |
Securities | 11,547 |
Fair Value Measurements, Recurring Basis | Corporate equity securities | Significant Other Observable Inputs (Level 2) |  |
Assets: |  |
Securities | 0 |
Fair Value Measurements, Recurring Basis | Corporate equity securities | Significant Unobservable Inputs (Level 3) |  |
Assets: |  |
Securities | $ 0 |
Fair Value Measurements, Recurring Basis | Warrant |  |
Assets: |  |
Securities |  | 1,890
Fair Value Measurements, Recurring Basis | Warrant | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Assets: |  |
Securities |  | 0
Fair Value Measurements, Recurring Basis | Warrant | Significant Other Observable Inputs (Level 2) |  |
Assets: |  |
Securities |  | 0
Fair Value Measurements, Recurring Basis | Warrant | Significant Unobservable Inputs (Level 3) |  |
Assets: |  |
Securities |  | $ 1,890

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