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Fair Value Measurement (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Schedule of assets and liabilities measured at fair value on a recurring basis |  |
Money market funds | $ 419,693 | $ 311,732
Marketable securities | 71,507 | 74,799
Liabilities: |  |
Accounts payable and accrued liabilities | 90,828 | 85,979
Recurring |  |
Schedule of assets and liabilities measured at fair value on a recurring basis |  |
Total assets at fair value on a recurring basis | 102,200 | 77,090
Money market funds | Recurring |  |
Schedule of assets and liabilities measured at fair value on a recurring basis |  |
Money market funds | 30,693 | 1,791
Corporate debt securities |  |
Schedule of assets and liabilities measured at fair value on a recurring basis |  |
Marketable securities | 42,709 | 47,930
Corporate debt securities | Recurring |  |
Schedule of assets and liabilities measured at fair value on a recurring basis |  |
Marketable securities | 42,709 | 48,430
Tax-exempt municipal securities |  |
Schedule of assets and liabilities measured at fair value on a recurring basis |  |
Marketable securities | 23,198 | 22,869
Tax-exempt municipal securities | Recurring |  |
Schedule of assets and liabilities measured at fair value on a recurring basis |  |
Marketable securities | 23,198 | 22,869
Variable rate demand notes |  |
Schedule of assets and liabilities measured at fair value on a recurring basis |  |
Marketable securities | 5,600 | 4,000
Variable rate demand notes | Recurring |  |
Schedule of assets and liabilities measured at fair value on a recurring basis |  |
Marketable securities | 5,600 | 4,000
Deferred payments | Recurring |  |
Liabilities: |  |
Accounts payable and accrued liabilities | 3,257 | 4,120
Quoted Prices In Active Markets For Identical Assets/Liabilities (Level 1) | Recurring |  |
Schedule of assets and liabilities measured at fair value on a recurring basis |  |
Total assets at fair value on a recurring basis | 30,693 | 1,791
Quoted Prices In Active Markets For Identical Assets/Liabilities (Level 1) | Money market funds | Recurring |  |
Schedule of assets and liabilities measured at fair value on a recurring basis |  |
Money market funds | 30,693 | 1,791
Significant Other Observable Inputs (Level 2) | Recurring |  |
Schedule of assets and liabilities measured at fair value on a recurring basis |  |
Total assets at fair value on a recurring basis | 71,507 | 75,299
Significant Other Observable Inputs (Level 2) | Corporate debt securities | Recurring |  |
Schedule of assets and liabilities measured at fair value on a recurring basis |  |
Marketable securities | 42,709 | 48,430
Significant Other Observable Inputs (Level 2) | Tax-exempt municipal securities | Recurring |  |
Schedule of assets and liabilities measured at fair value on a recurring basis |  |
Marketable securities | 23,198 | 22,869
Significant Other Observable Inputs (Level 2) | Variable rate demand notes | Recurring |  |
Schedule of assets and liabilities measured at fair value on a recurring basis |  |
Marketable securities | 5,600 | 4,000
Significant Unobservable Inputs (Level 3) | Deferred payments | Recurring |  |
Liabilities: |  |
Accounts payable and accrued liabilities | $ 3,257 | $ 4,120

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