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Consolidated Financial Statement Components - Capitalized Software Development (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]          
Useful life     3 years    
Gross Carrying Amount $ 19,491   $ 19,491    
Accumulated Amortization (4,853)   (4,853)    
Capitalized software development, net 14,638   14,638   $ 10,179
Capitalized software development costs, additions $ 2,600 $ 2,900 $ 8,200 $ 8,200  
Capitalized software          
Property, Plant and Equipment [Line Items]          
Useful life     3 years