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Restructuring (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Oct. 31, 2019
Restructuring Cost and Reserve [Line Items]        
Percentage of workforce reduction       5.00%
Restructuring Reserve $ 1,555      
Restructuring expense 2,530 $ 0 $ 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 Reserve 947      
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 Reserve 511      
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 Reserve 97      
Restructuring expense 89      
Legal fees | General and administrative        
Restructuring Cost and Reserve [Line Items]        
Restructuring expense $ 89