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)

v3.21.1
Fair Value Measurements - Summary of Fair Value Assets Measured on Recurring Basis for Cash, Cash Equivalents and Marketable Securities (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Cash and cash equivalents $ 220,014 $ 211,962
Fair Value Measurements Recurring    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Adjusted cost 233,147 231,219
Gross unrealized gains (losses) 3  
Fair value 233,150 231,219
Cash and cash equivalents 220,014 211,962
Marketable securities 13,136 19,257
Fair Value Measurements Recurring | Cash    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Adjusted cost 48,706 52,812
Fair value 48,706 52,812
Cash and cash equivalents 48,706 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 171,308 159,150
Fair value 171,308 159,150
Cash and cash equivalents 171,308 159,150
Fair Value Measurements Recurring | Level 2 | Corporate Bonds    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Adjusted cost 5,477 11,549
Gross unrealized gains (losses) (1) (1)
Fair value 5,476 11,548
Marketable securities 5,476 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 4,053 4,107
Gross unrealized gains (losses) 1  
Fair value 4,054 4,107
Marketable securities 4,054 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 3,603 3,601
Gross unrealized gains (losses) 3 1
Fair value 3,606 3,602
Marketable securities $ 3,606 $ 3,602