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Investments - Summary of Investments with Unrealized Losses, Aggregated by Investment Type and the Length of Time (Details)
$ in Thousands
Sep. 30, 2020
USD ($)
security
Dec. 31, 2019
USD ($)
security
Debt Securities, Available-for-sale [Line Items]    
Fair value, less than 12 months $ 25,128 $ 22,798
Unrealized loss, less than 12 months (5) (15)
Fair value, greater than 12 months 0 0
Unrealized loss, greater than 12 months 0 0
Fair value, total 25,128 22,798
Unrealized loss, total $ (5) $ (15)
Number of securities with unrealized losses, less than 12 months | security 8 9
Number of securities with unrealized losses, greater than 12 months | security 0 0
Number of securities with unrealized losses, total | security 8 9
Corporate bonds    
Debt Securities, Available-for-sale [Line Items]    
Fair value, less than 12 months   $ 9,657
Unrealized loss, less than 12 months   (9)
Fair value, greater than 12 months   0
Unrealized loss, greater than 12 months   0
Fair value, total   9,657
Unrealized loss, total   (9)
Commercial paper    
Debt Securities, Available-for-sale [Line Items]    
Fair value, less than 12 months   10,147
Unrealized loss, less than 12 months   (4)
Fair value, greater than 12 months   0
Unrealized loss, greater than 12 months   0
Fair value, total   10,147
Unrealized loss, total   (4)
U.S. treasury securities    
Debt Securities, Available-for-sale [Line Items]    
Fair value, less than 12 months $ 25,128 2,994
Unrealized loss, less than 12 months (5) (2)
Fair value, greater than 12 months 0 0
Unrealized loss, greater than 12 months 0 0
Fair value, total 25,128 2,994
Unrealized loss, total $ (5) $ (2)