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Fair Value Measurements - Additional Information (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019
Fair Value Disclosures [Abstract] |  |
Financial instruments transferred among fair value hierarchy levels | $ 0 |
Cash equivalents included of available-for-sale securities | 55,900,000 | $ 15,000,000.0
Available for sale securities with contractual maturities of three months to one year. | $ 103,400,000 | 279,700,000
Available for sale securities with contractual maturities greater than one year |  | $ 39,400,000

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- Definition Available-for-sale securities, debt securities, current, contractual maturities of three months to one year. + References No definition available. + Details
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- Definition Available for sale securities debt securities with contractual maturities after one year. + References No definition available. + Details
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- Definition Transfers among fair value hierarchy levels amount. + References No definition available. + Details
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- Definition Amount of short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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