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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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Represents the maximum investment limit in any one financial institution as per entity's risk management investment policy.

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Represents the number of global banks with cash, cash equivalent and restricted cash held on deposit if disclosed as a concentration risk.

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Represents the number of "Triple A" rated money market funds with cash, cash equivalent and restricted cash held on deposit, if disclosed as a concentration risk.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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