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Restructuring (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Oct. 31, 2019
Restructuring Cost and Reserve [Line Items]          
Percentage of workforce reduction         5.00%
Restructuring expense $ 2,530 $ 0 $ 2,530 $ 0  
Cost of revenue          
Restructuring Cost and Reserve [Line Items]          
Restructuring expense 28        
Sales and marketing          
Restructuring Cost and Reserve [Line Items]          
Restructuring expense 1,790        
Research and development          
Restructuring Cost and Reserve [Line Items]          
Restructuring expense 429        
General and administrative          
Restructuring Cost and Reserve [Line Items]          
Restructuring expense 283        
Employee severance and related payroll taxes          
Restructuring Cost and Reserve [Line Items]          
Restructuring expense 1,917        
Employee severance and related payroll taxes | Cost of revenue          
Restructuring Cost and Reserve [Line Items]          
Restructuring expense 28        
Employee severance and related payroll taxes | Sales and marketing          
Restructuring Cost and Reserve [Line Items]          
Restructuring expense 1,355        
Employee severance and related payroll taxes | Research and development          
Restructuring Cost and Reserve [Line Items]          
Restructuring expense 340        
Employee severance and related payroll taxes | General and administrative          
Restructuring Cost and Reserve [Line Items]          
Restructuring expense 194        
Facilities closure expenses          
Restructuring Cost and Reserve [Line Items]          
Restructuring expense 524        
Facilities closure expenses | Sales and marketing          
Restructuring Cost and Reserve [Line Items]          
Restructuring expense 435        
Facilities closure expenses | Research and development          
Restructuring Cost and Reserve [Line Items]          
Restructuring expense 89        
Legal fees          
Restructuring Cost and Reserve [Line Items]          
Restructuring expense 89        
Legal fees | General and administrative          
Restructuring Cost and Reserve [Line Items]          
Restructuring expense $ 89