Annual report pursuant to Section 13 and 15(d)

Fair Value Measurements - Schedule of Fair Value of Short-term Investments (Details)

v3.20.4
Fair Value Measurements - Schedule of Fair Value of Short-term Investments (Details)
$ in Thousands
Dec. 31, 2020
USD ($)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]  
Assets, Fair value $ 330,274
U.S. government securities [Member]  
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]  
Assets, Fair value 125,379
Level 1 [Member]  
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]  
Assets, Fair value 125,379
Level 1 [Member] | U.S. government securities [Member]  
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]  
Assets, Fair value 125,379
Level 2 [Member]  
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]  
Assets, Fair value 204,895
Certificates of deposit [Member]  
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]  
Assets, Fair value 75,032
Certificates of deposit [Member] | Level 2 [Member]  
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]  
Assets, Fair value 75,032
Commercial paper [Member]  
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]  
Assets, Fair value 129,863
Commercial paper [Member] | Level 2 [Member]  
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]  
Assets, Fair value $ 129,863