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Cash, Concentration of Credit Risk and Fair Value of Financial Instruments - Fair Value of Financial Assets and Liabilities (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018 | Sep. 30, 2018
--- | --- | --- | ---
Assets: |  |  |
Money market and demand accounts | $ 746,195 | $ 488,733 | $ 524,771
Commercial paper | 0 | 14,548 |
Total | 957,932 | 959,457 |
Liabilities: |  |  |
Contingent consideration resulting from the Technicolor Acquisition |  | 19,800 |
Total |  | 19,800 |
Money market and demand accounts |  |  |
Assets: |  |  |
Money market and demand accounts | 746,195 | 488,733 |
U.S. government securities |  |  |
Assets: |  |  |
Securities | 113,541 | 289,576 |
Corporate bonds, asset backed and other securities |  |  |
Assets: |  |  |
Securities | 98,196 | 166,600 |
Level 1 |  |  |
Assets: |  |  |
Commercial paper | 0 | 0 |
Total | 746,195 | 488,733 |
Liabilities: |  |  |
Contingent consideration resulting from the Technicolor Acquisition |  | 0 |
Total |  | 0 |
Level 1 | Money market and demand accounts |  |  |
Assets: |  |  |
Money market and demand accounts | 746,195 | 488,733 |
Level 1 | U.S. government securities |  |  |
Assets: |  |  |
Securities | 0 | 0 |
Level 1 | Corporate bonds, asset backed and other securities |  |  |
Assets: |  |  |
Securities | 0 | 0 |
Level 2 |  |  |
Assets: |  |  |
Commercial paper | 0 | 14,548 |
Total | 211,737 | 470,724 |
Liabilities: |  |  |
Contingent consideration resulting from the Technicolor Acquisition |  | 0 |
Total |  | 0 |
Level 2 | Money market and demand accounts |  |  |
Assets: |  |  |
Money market and demand accounts | 0 | 0 |
Level 2 | U.S. government securities |  |  |
Assets: |  |  |
Securities | 113,541 | 289,576 |
Level 2 | Corporate bonds, asset backed and other securities |  |  |
Assets: |  |  |
Securities | 98,196 | 166,600 |
Level 3 |  |  |
Assets: |  |  |
Commercial paper | 0 | 0 |
Total | 0 | 0 |
Liabilities: |  |  |
Total |  | 19,800 |
Level 3 | Money market and demand accounts |  |  |
Assets: |  |  |
Money market and demand accounts | 0 | 0 |
Level 3 | U.S. government securities |  |  |
Assets: |  |  |
Securities | 0 | 0 |
Level 3 | Corporate bonds, asset backed and other securities |  |  |
Assets: |  |  |
Securities | $ 0 | $ 0 |

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