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Fair Value Measurements - Summary of Fair Value Assets Measured on Recurring Basis for Cash, Cash Equivalents and Marketable Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
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Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Cash and cash equivalents | $ 213,984 | $ 198,037
Fair Value Measurements Recurring |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Adjusted cost | 220,508 | 209,086
Gross unrealized gains | 1 | 8
Fair value | 220,509 | 209,094
Cash and cash equivalents | 213,984 | 198,037
Marketable securities | 6,525 | 11,057
Fair Value Measurements Recurring | Cash |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Adjusted cost | 46,137 | 51,560
Fair value | 46,137 | 51,560
Cash and cash equivalents | 46,137 | 51,560
Fair Value Measurements Recurring | Level 1 | Money Market Accounts |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Adjusted cost | 167,847 | 146,477
Fair value | 167,847 | 146,477
Cash and cash equivalents | 167,847 | 146,477
Fair Value Measurements Recurring | Level 2 | Corporate Bonds |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Adjusted cost | 6,524 | 2,011
Gross unrealized gains | 1 | 2
Fair value | 6,525 | 2,013
Marketable securities | $ 6,525 | 2,013
Fair Value Measurements Recurring | Level 2 | U.S. Treasury Securities |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Adjusted cost |  | 9,038
Gross unrealized gains |  | 6
Fair value |  | 9,044
Marketable securities |  | $ 9,044

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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes 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 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3044-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121566466&loc=d3e6676-107765 Reference 3: 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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