Quarterly report pursuant to Section 13 or 15(d)

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

v3.20.2
Fair Value Measurements - Schedule of Fair Value of Short-term Investments (Details)
$ in Thousands
Sep. 30, 2020
USD ($)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]  
Assets, Fair value $ 205,294
U.S. government securities [Member]  
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]  
Assets, Fair value 75,367
Level 1 [Member]  
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]  
Assets, Fair value 75,367
Level 1 [Member] | U.S. government securities [Member]  
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]  
Assets, Fair value 75,367
Level 2 [Member]  
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]  
Assets, Fair value 129,927
Certificates of deposit [Member]  
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]  
Assets, Fair value 55,000
Certificates of deposit [Member] | Level 2 [Member]  
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]  
Assets, Fair value 55,000
Commercial paper [Member]  
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]  
Assets, Fair value 74,927
Commercial paper [Member] | Level 2 [Member]  
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]  
Assets, Fair value $ 74,927