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Fair Value of Financial Instruments Including Cash, Cash Equivalents, and Investments - Schedule of Investments (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
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Fair Value Disclosures [Abstract] |  |
Certificates of deposit due in one year or less, Amortized Cost | $ 90,000 | $ 100,000
Held to maturity amortized cost | 90,000 | 100,000
Certificates of deposit due in one year or less, Estimated Fair Value | 90,000 | 100,000
Held to maturity fair value | $ 90,000 | $ 100,000

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