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Fair Value Measurement (Details) - USD ($) | Sep. 30, 2018 | Dec. 31, 2017 | Sep. 30, 2017
--- | --- | --- | ---
Schedule of assets and liabilities measured at fair value on a recurring basis |  |  |
Money market funds | $ 276,382,000 | $ 155,933,000 | $ 150,483,000
Marketable securities | 71,463,000 | 0 |
Recurring |  |  |
Schedule of assets and liabilities measured at fair value on a recurring basis |  |  |
Total assets at fair value on a recurring basis | 74,734,000 |  |
Money market funds | Recurring |  |  |
Schedule of assets and liabilities measured at fair value on a recurring basis |  |  |
Money market funds | 3,271,000 | 113,000 |
Corporate debt securities |  |  |
Schedule of assets and liabilities measured at fair value on a recurring basis |  |  |
Marketable securities | 41,465,000 |  |
Corporate debt securities | Recurring |  |  |
Schedule of assets and liabilities measured at fair value on a recurring basis |  |  |
Marketable securities | 41,465,000 |  |
Tax-exempt municipal securities |  |  |
Schedule of assets and liabilities measured at fair value on a recurring basis |  |  |
Marketable securities | 21,298,000 |  |
Tax-exempt municipal securities | Recurring |  |  |
Schedule of assets and liabilities measured at fair value on a recurring basis |  |  |
Marketable securities | 21,298,000 |  |
Variable rate demand notes |  |  |
Schedule of assets and liabilities measured at fair value on a recurring basis |  |  |
Marketable securities | 8,700,000 |  |
Variable rate demand notes | Recurring |  |  |
Schedule of assets and liabilities measured at fair value on a recurring basis |  |  |
Marketable securities | 8,700,000 |  |
Deferred payments | Recurring |  |  |
Liabilities: |  |  |
Deferred payments | 4,366,000 | 4,514,000 |
Quoted Prices In Active Markets For Identical Assets/Liabilities (Level 1) [Member] | Recurring |  |  |
Schedule of assets and liabilities measured at fair value on a recurring basis |  |  |
Total assets at fair value on a recurring basis | 3,271,000 |  |
Quoted Prices In Active Markets For Identical Assets/Liabilities (Level 1) [Member] | Money market funds | Recurring |  |  |
Schedule of assets and liabilities measured at fair value on a recurring basis |  |  |
Money market funds | 3,271,000 | 113,000 |
Significant Other Observable Inputs (Level 2) [Member] | Recurring |  |  |
Schedule of assets and liabilities measured at fair value on a recurring basis |  |  |
Total assets at fair value on a recurring basis | 71,463,000 |  |
Significant Other Observable Inputs (Level 2) [Member] | Corporate debt securities | Recurring |  |  |
Schedule of assets and liabilities measured at fair value on a recurring basis |  |  |
Marketable securities | 41,465,000 |  |
Significant Other Observable Inputs (Level 2) [Member] | Tax-exempt municipal securities | Recurring |  |  |
Schedule of assets and liabilities measured at fair value on a recurring basis |  |  |
Marketable securities | 21,298,000 |  |
Significant Other Observable Inputs (Level 2) [Member] | Variable rate demand notes | Recurring |  |  |
Schedule of assets and liabilities measured at fair value on a recurring basis |  |  |
Marketable securities | 8,700,000 |  |
Significant Unobservable Inputs (Level 3) [Member] | Deferred payments | Recurring |  |  |
Liabilities: |  |  |
Deferred payments | $ 4,366,000 | $ 4,514,000 |

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