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Marketable Securities - Summary of Marketable Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
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Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract] |  |
Adjusted Cost | $ 122,221 | $ 147,903
Unrealized Gains | 1,322 | 1,815
Unrealized Losses | (619) | (38)
Fair Value | 122,924 | 149,680
Mutual and money market funds |  |
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract] |  |
Adjusted Cost | 87,965 | 103,404
Unrealized Gains | 1,083 | 1,288
Unrealized Losses | (480) | (20)
Fair Value | 88,568 | 104,672
Corporate bonds |  |
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract] |  |
Adjusted Cost | 18,935 | 21,811
Unrealized Gains | 168 | 350
Unrealized Losses | (32) | (6)
Fair Value | 19,071 | 22,155
Government securities - U.S. |  |
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract] |  |
Adjusted Cost | 13,503 | 18,849
Unrealized Gains | 64 | 155
Unrealized Losses | (105) | (5)
Fair Value | 13,462 | 18,999
Other fixed-income securities |  |
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract] |  |
Adjusted Cost | 1,818 | 3,839
Unrealized Gains | 7 | 22
Unrealized Losses | (2) | (7)
Fair Value | $ 1,823 | $ 3,854

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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27161-111563 + Details
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