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Fair Value Measurements - Additional Information (Details) | 9 Months Ended
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Sep. 30, 2020 USD ($)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |
Realized gains or losses on sales of marketable securities | $ 0
Unrealized loss position for 12 months or greater on security | $ 0
Minimum |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |
Long-term marketable debt securities maturity period | 19 months
Maximum |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |
Long-term marketable debt securities maturity period | 24 months
Long-term Investments |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |
Debt securities, aggregate cost basis | $ 12,000,000
Debt securities, fair value | $ 12,000,000

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