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Summary of Significant Accounting Policies - Concentration of Credit Risk (Details) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 USD ($) bank fund | Dec. 31, 2019 fund
Cash and Cash Equivalents [Line Items] |  |
Number of "Triple A" rated money market funds with cash, cash equivalent and restricted cash held on deposit | fund | 4 | 7
Number of global banks with cash, cash equivalent and restricted cash held on deposit | bank | 1 |
Maximum investment limit in any one financial institution | $ | $ 75,000,000 |
Investment in single mutual fund | Credit Concentration Risk |  |
Cash and Cash Equivalents [Line Items] |  |
Concentration risk percentage | 1.00% |

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