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Acquisitions, Intangible Assets and Goodwill - Additional Information (Details) - USD ($)
3 Months Ended
Sep. 03, 2019
Apr. 01, 2019
Mar. 31, 2020
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2019
Acquisitions Intangible Assets And Goodwill [Line Items]              
Goodwill     $ 461,395,000       $ 462,927,000
Amortization expense related to capitalized internal-use software     3,600,000     $ 3,700,000  
Amortization expense     3,368,000     $ 1,025,000  
Capitalized internal-use software, net     32,901,000       $ 33,156,000
Capitalized Internal-Use Software Net in Development Phase              
Acquisitions Intangible Assets And Goodwill [Line Items]              
Capitalized internal-use software, net     $ 14,000,000.0        
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 $ 61,500,000            
Net cash acquired 700,000            
Business combination, total purchase consideration 68,300,000            
Business combination, net tangible liabilities 3,300,000            
Goodwill 53,900,000            
GetFeedback, Inc | General and Administrative Expenses              
Acquisitions Intangible Assets And Goodwill [Line Items]              
Acquisition-related incremental expenses       $ 700,000      
GetFeedback, Inc | Customer Relationships and Developed Technology              
Acquisitions Intangible Assets And Goodwill [Line Items]              
Business combination, fair value identifiable intangible assets $ 17,700,000            
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   $ 53,100,000          
Net cash acquired   1,100,000          
Business combination, total purchase consideration   84,300,000          
Business combination, net tangible liabilities   2,900          
Goodwill   $ 72,100,000          
Usabilla Holding B.V. | General and Administrative Expenses              
Acquisitions Intangible Assets And Goodwill [Line Items]              
Acquisition-related incremental expenses         $ 1,000,000.0    
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   $ 15,100,000