Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements - Summary of Fair Value Assets Measured on Recurring Basis for Cash, Cash Equivalents and Marketable Securities (Details)

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Fair Value Measurements - Summary of Fair Value Assets Measured on Recurring Basis for Cash, Cash Equivalents and Marketable Securities (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Cash and cash equivalents $ 241,576 $ 211,962
Fair Value Measurements Recurring    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Adjusted cost 245,128 231,219
Fair value 245,128 231,219
Cash and cash equivalents 241,576 211,962
Marketable securities 3,552 19,257
Fair Value Measurements Recurring | Cash    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Adjusted cost 38,653 52,812
Fair value 38,653 52,812
Cash and cash equivalents 38,653 52,812
Fair Value Measurements Recurring | Level 1 | Money Market Accounts    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Adjusted cost 202,923 159,150
Fair value 202,923 159,150
Cash and cash equivalents 202,923 159,150
Fair Value Measurements Recurring | Level 2 | Corporate Bonds    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Adjusted cost   11,549
Gross unrealized gains (losses)   (1)
Fair value   11,548
Marketable securities   11,548
Fair Value Measurements Recurring | Level 2 | U.S. Treasury Securities    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Adjusted cost   4,107
Fair value   4,107
Marketable securities   4,107
Fair Value Measurements Recurring | Level 2 | Agency Mortgage-backed Securities    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Adjusted cost 3,552 3,601
Gross unrealized gains (losses)   1
Fair value 3,552 3,602
Marketable securities $ 3,552 $ 3,602