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Acquisitions, Intangible Assets and Goodwill - Additional Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Sep. 03, 2019
Apr. 01, 2019
Dec. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Acquisitions Intangible Assets And Goodwill [Line Items]            
Cash consideration       $ 0 $ 114,603 $ 0
Goodwill     $ 468,764 468,764 462,927 336,861
Amortization expense       12,602 8,995 4,270
Removal of fully amortized acquisition intangible assets     9,700      
Amortization expense related to capitalized internal-use software       14,200 15,600 $ 21,700
Removal of fully amortized capitalized internal-use software     20,800      
Capitalized internal-use software, net     29,462 29,462 33,156  
General and Administrative Expenses            
Acquisitions Intangible Assets And Goodwill [Line Items]            
Acquisition-related incremental expenses         $ 1,700  
Capitalized Internal-Use Software Net in Development Phase            
Acquisitions Intangible Assets And Goodwill [Line Items]            
Capitalized internal-use software, net     $ 10,000 $ 10,000    
GetFeedback, Inc            
Acquisitions Intangible Assets And Goodwill [Line Items]            
Closing date of acquisition Sep. 03, 2019          
Percentage of outstanding shares acquired 100.00%          
Business combination, consideration paid in common stock 376,333          
Business combination, fair value of common stock $ 16.24          
Cash consideration $ 61,500          
Net cash acquired 700          
Business combination, total purchase consideration 68,300          
Business combination, net tangible liabilities 3,300          
Goodwill 53,900          
GetFeedback, Inc | Customer Relationships and Developed Technology            
Acquisitions Intangible Assets And Goodwill [Line Items]            
Business combination, fair value identifiable intangible assets $ 17,700          
Usabilla Holding B.V.            
Acquisitions Intangible Assets And Goodwill [Line Items]            
Closing date of acquisition   Apr. 01, 2019        
Percentage of outstanding shares acquired   100.00%        
Business combination, consideration paid in common stock   1,644,413        
Business combination, fair value of common stock   $ 18.30        
Cash consideration   $ 53,100        
Net cash acquired   1,100        
Business combination, total purchase consideration   84,300        
Business combination, net tangible liabilities   2,900        
Goodwill   $ 72,100        
Usabilla Holding B.V. | Certain Employees of Acquired Company            
Acquisitions Intangible Assets And Goodwill [Line Items]            
Business acquisition, additional consideration granted   299,798        
Requisite service period   3 years        
Usabilla Holding B.V. | Developed Technology            
Acquisitions Intangible Assets And Goodwill [Line Items]            
Business combination, fair value identifiable intangible assets   $ 15,100