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Related-Party Transactions (Details)
3 Months Ended 9 Months Ended
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2020
USD ($)
board_member
Sep. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
Adobe Systems | Chief Executive Officer          
Related Party Transaction [Line Items]          
Purchases from related party $ 300,000 $ 400,000 $ 1,100,000 $ 1,900,000  
Revenue from related parties 0 0 100,000 0  
Due to related parties 100,000   100,000   $ 200,000
Receivables from related party 0   0    
PayPal | Board Of Directors Member          
Related Party Transaction [Line Items]          
Expenses from transactions with related party 500,000 400,000 1,500,000 1,200,000  
Synack, Inc. | Board Of Directors Member          
Related Party Transaction [Line Items]          
Purchases from related party $ 0 $ 100,000 $ 100,000 $ 400,000  
Number of board members appointed to board of directors of related party | board_member     1