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Certain Balance Sheet Components - Property and Equipment, net (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Property, Plant and Equipment [Line Items]          
Property and equipment, gross $ 22,391   $ 22,391   $ 19,376
Accumulated depreciation and amortization (12,200)   (12,200)   (9,899)
Property and equipment, net 10,191   10,191   9,477
Depreciation and amortization 786 $ 901 2,567 $ 2,608  
Capitalized internal-use software costs 100 $ 0 1,500 $ 0  
Leasehold improvements          
Property, Plant and Equipment [Line Items]          
Property and equipment, gross 8,110   8,110   8,110
Computer equipment          
Property, Plant and Equipment [Line Items]          
Property and equipment, gross 8,917   8,917   7,634
Furniture and fixtures          
Property, Plant and Equipment [Line Items]          
Property and equipment, gross 2,459   2,459   2,333
Internally developed and purchased software          
Property, Plant and Equipment [Line Items]          
Property and equipment, gross $ 2,905   $ 2,905   $ 1,299