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Fair Value Measurement - Assets and Liabilities Measured at Fair Value (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Assets: |  |
Cash and cash equivalents | $ 268,918 | $ 187,509
Marketable securities | 29,878 | 37,827
Liabilities: |  |
Deferred payments | 95,518 | 104,742
Recurring |  |
Assets: |  |
Total assets at fair value on a recurring basis | 34,012 | 40,668
Money market funds | Recurring |  |
Assets: |  |
Cash and cash equivalents | 4,134 | 2,841
Tax-exempt municipal securities |  |
Assets: |  |
Marketable securities | 18,817 | 20,289
Tax-exempt municipal securities | Recurring |  |
Assets: |  |
Marketable securities | 18,817 | 20,289
Corporate debt securities |  |
Assets: |  |
Marketable securities | 11,061 | 17,538
Corporate debt securities | Recurring |  |
Assets: |  |
Marketable securities | 11,061 | 17,538
Deferred payments | Recurring |  |
Liabilities: |  |
Deferred payments | 658 | 1,658
Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) | Recurring |  |
Assets: |  |
Total assets at fair value on a recurring basis | 4,134 | 2,841
Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) | Money market funds | Recurring |  |
Assets: |  |
Cash and cash equivalents | 4,134 | 2,841
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) | Corporate debt securities | 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 | 29,878 | 37,827
Significant Other Observable Inputs (Level 2) | Money market funds | Recurring |  |
Assets: |  |
Cash and cash equivalents | 0 | 0
Significant Other Observable Inputs (Level 2) | Tax-exempt municipal securities | Recurring |  |
Assets: |  |
Marketable securities | 18,817 | 20,289
Significant Other Observable Inputs (Level 2) | Corporate debt securities | Recurring |  |
Assets: |  |
Marketable securities | 11,061 | 17,538
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: |  |
Cash and cash equivalents | 0 | 0
Significant Unobservable Inputs (Level 3) | Tax-exempt municipal securities | Recurring |  |
Assets: |  |
Marketable securities | 0 | 0
Significant Unobservable Inputs (Level 3) | Corporate debt securities | Recurring |  |
Assets: |  |
Marketable securities | 0 | 0
Significant Unobservable Inputs (Level 3) | Deferred payments | Recurring |  |
Liabilities: |  |
Deferred payments | $ 658 | $ 1,658

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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=120400017&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=120398452&loc=d3e534808-122878 + Details
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