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Fair Value Measurement - Assets and Liabilities Measured at Fair Value (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018 | Jun. 30, 2018
--- | --- | --- | ---
Assets: |  |  |
Money market funds | $ 375,515 | $ 311,732 | $ 171,600
Marketable securities: | 65,025 | 74,799 |
Recurring |  |  |
Assets: |  |  |
Total assets at fair value on a recurring basis | 101,340 | 77,090 |
Money market funds | Recurring |  |  |
Assets: |  |  |
Money market funds | 36,315 | 1,791 |
Corporate debt securities |  |  |
Assets: |  |  |
Marketable securities: | 44,026 | 47,930 |
Corporate debt securities | Recurring |  |  |
Assets: |  |  |
Marketable securities: | 44,026 | 48,430 |
Tax-exempt municipal securities |  |  |
Assets: |  |  |
Marketable securities: | 15,399 | 22,869 |
Tax-exempt municipal securities | Recurring |  |  |
Assets: |  |  |
Marketable securities: | 15,399 | 22,869 |
Variable rate demand notes |  |  |
Assets: |  |  |
Marketable securities: | 5,600 | 4,000 |
Variable rate demand notes | Recurring |  |  |
Assets: |  |  |
Marketable securities: | 5,600 | 4,000 |
Deferred payments | Recurring |  |  |
Liabilities: |  |  |
Deferred payments | 3,664 | 4,120 |
Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) | Recurring |  |  |
Assets: |  |  |
Total assets at fair value on a recurring basis | 36,315 | 1,791 |
Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) | Money market funds | Recurring |  |  |
Assets: |  |  |
Money market funds | 36,315 | 1,791 |
Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) | Corporate debt securities | Recurring |  |  |
Assets: |  |  |
Marketable securities: | 0 | 0 |
Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) | Tax-exempt municipal securities | Recurring |  |  |
Assets: |  |  |
Marketable securities: | 0 | 0 |
Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) | Variable rate demand notes | Recurring |  |  |
Assets: |  |  |
Marketable securities: | 0 | 0 |
Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) | Deferred payments | Recurring |  |  |
Liabilities: |  |  |
Deferred payments | 0 | 0 |
Significant Other Observable Inputs (Level 2) | Recurring |  |  |
Assets: |  |  |
Total assets at fair value on a recurring basis | 65,025 | 75,299 |
Significant Other Observable Inputs (Level 2) | Money market funds | Recurring |  |  |
Assets: |  |  |
Money market funds | 0 | 0 |
Significant Other Observable Inputs (Level 2) | Corporate debt securities | Recurring |  |  |
Assets: |  |  |
Marketable securities: | 44,026 | 48,430 |
Significant Other Observable Inputs (Level 2) | Tax-exempt municipal securities | Recurring |  |  |
Assets: |  |  |
Marketable securities: | 15,399 | 22,869 |
Significant Other Observable Inputs (Level 2) | Variable rate demand notes | Recurring |  |  |
Assets: |  |  |
Marketable securities: | 5,600 | 4,000 |
Significant Other Observable Inputs (Level 2) | Deferred payments | Recurring |  |  |
Liabilities: |  |  |
Deferred payments | 0 | 0 |
Significant Unobservable Inputs (Level 3) | Recurring |  |  |
Assets: |  |  |
Total assets at fair value on a recurring basis | 0 | 0 |
Significant Unobservable Inputs (Level 3) | Money market funds | Recurring |  |  |
Assets: |  |  |
Money market funds | 0 | 0 |
Significant Unobservable Inputs (Level 3) | Corporate debt securities | Recurring |  |  |
Assets: |  |  |
Marketable securities: | 0 | 0 |
Significant Unobservable Inputs (Level 3) | Tax-exempt municipal securities | Recurring |  |  |
Assets: |  |  |
Marketable securities: | 0 | 0 |
Significant Unobservable Inputs (Level 3) | Variable rate demand notes | Recurring |  |  |
Assets: |  |  |
Marketable securities: | 0 | 0 |
Significant Unobservable Inputs (Level 3) | Deferred payments | Recurring |  |  |
Liabilities: |  |  |
Deferred payments | $ 3,664 | $ 4,120 |

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- Definition Sum of the carrying values as of the balance sheet date of obligations incurred through that date, including liabilities incurred and payable to vendors for goods and services received, taxes, interest, rent and utilities, compensation costs, payroll taxes and fringe benefits (other than pension and postretirement obligations), contractual rights and obligations, and statutory obligations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.15) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.15(1),(5)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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