Quarterly report pursuant to Section 13 or 15(d)

Cash Equivalents and Marketable Securities - Schedule of Cash Equivalents and Marketable Securities (Details)

v3.20.2
Cash Equivalents and Marketable Securities - Schedule of Cash Equivalents and Marketable Securities (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Sep. 30, 2019
Cash And Cash Equivalents [Line Items]      
Amortized Cost Basis $ 201,646 $ 131,499  
Unrealized Gains 237 168  
Unrealized (Losses) 0 (3)  
Fair Value 201,883 131,664  
Less amounts classified as cash equivalents, Amortized Cost Basis (64,370) (4,960) $ (11,954)
Marketable Securities      
Cash And Cash Equivalents [Line Items]      
Amortized Cost Basis 137,753 128,348  
Unrealized Gains 237 168  
Unrealized (Losses) 0 (3)  
Fair Value 137,990 128,513  
Cash Equivalents      
Cash And Cash Equivalents [Line Items]      
Less amounts classified as cash equivalents, Amortized Cost Basis (63,893) (3,151)  
Less amounts classified as cash equivalents, Fair Value (63,893) (3,151)  
Money Market Funds      
Cash And Cash Equivalents [Line Items]      
Amortized Cost Basis 63,893 3,151  
Unrealized Gains 0 0  
Unrealized (Losses) 0 0  
Fair Value 63,893 3,151  
Commercial Paper      
Cash And Cash Equivalents [Line Items]      
Amortized Cost Basis 40,182 4,952  
Unrealized Gains 0 0  
Unrealized (Losses) 0 0  
Fair Value 40,182 4,952  
Corporate Debt Securities      
Cash And Cash Equivalents [Line Items]      
Amortized Cost Basis 42,399 69,423  
Unrealized Gains 81 79  
Unrealized (Losses) 0 (3)  
Fair Value 42,480 69,499  
Asset-backed Securities      
Cash And Cash Equivalents [Line Items]      
Amortized Cost Basis 8,573 27,005  
Unrealized Gains 74 50  
Unrealized (Losses) 0 0  
Fair Value 8,647 27,055  
U.S. Government Agencies      
Cash And Cash Equivalents [Line Items]      
Amortized Cost Basis 46,599 26,968  
Unrealized Gains 82 39  
Unrealized (Losses) 0 0  
Fair Value $ 46,681 $ 27,007