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Stock-Based Compensation - Narrative (Details) - USD ($)
1 Months Ended 3 Months Ended
Mar. 31, 2020
Jul. 31, 2019
Apr. 30, 2019
Mar. 31, 2019
Jan. 31, 2019
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Common stock reserved for future issuance (in shares) 32,360,000         32,360,000   29,709,000
Aggregate intrinsic value of stock option awards exercised           $ 31,200,000 $ 4,200,000  
Options granted (in shares)           0    
Unrecognized compensation expense $ 49,800,000         $ 49,800,000    
Unrecognized compensation expense, recognition period           3 years 2 months 12 days    
Stock-based compensation expense           $ 8,063,000 5,510,000  
Stock-based compensation related to capitalized internal-use software (less than)           $ 100,000    
Restricted Stock Awards                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Common stock reserved for future issuance (in shares) 614,000         614,000   736,000
Unrecognized compensation expense $ 5,000,000.0         $ 5,000,000.0    
Unrecognized compensation expense, recognition period           2 years 4 months 24 days    
Number of awards granted (in shares)       982,301        
Grant date fair value of awards issued       $ 9,600,000        
Stock-based compensation expense           $ 500,000 200,000  
Vested (in shares)           122,000    
Restricted Stock Units, Performance RSUs and PSUs                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Number of awards granted (in shares)           726,000    
Stock-based compensation expense           $ 100,000    
Vested (in shares)           620,000    
Service-Based RSUs                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Vesting period           4 years    
Number of awards granted (in shares)         982,301      
Stock-based compensation expense           $ 500,000 400,000  
Service-Based RSUs | Vesting Tranche One                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Vesting period           4 years    
Vesting percentage           25.00%    
Service-Based RSUs | Vesting Tranche Two                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Vesting period           4 years    
Vesting percentage           2.08%    
Performance-Based RSUs                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Vesting period     4 years     1 year    
Number of awards granted (in shares)     100,000     23,196    
Performance-Based RSUs | Vesting Tranche One                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Vesting period           6 months 1 day    
RSUs and Performance RSUs                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Stock-based compensation expense           $ 6,100,000 4,200,000  
Restricted stock units                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Common stock reserved for future issuance (in shares) 4,713,000         4,713,000   5,208,000
Number of awards granted (in shares)           726,000    
Stock-based compensation expense           $ 3,800,000    
Vested (in shares)         491,151      
Service and Market-Based Options and RSUs                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Unrecognized compensation expense $ 1,400,000         $ 1,400,000    
Unrecognized compensation expense, recognition period           2 years 6 months    
Stock-based compensation expense           $ 200,000 400,000  
Service and Market-Based Options                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Number of options canceled (in shares)       196,460        
Service and Market-Based RSUs                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Number of awards granted (in shares)         161,250      
Canceled Market-based Options                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Stock-based compensation expense             200,000  
Employee Stock                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Common stock reserved for future issuance (in shares) 1,843,000         1,843,000   890,000
Unrecognized compensation expense $ 200,000         $ 200,000    
Unrecognized compensation expense, recognition period           1 month 6 days    
Stock-based compensation expense           $ 400,000    
Issued in period (in shares)           0    
RSUs Vested And Released [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Number of shares immediately vested in award modification (in shares) 11,412              
Stock-based compensation expense recognized due to immediate vested in award modification $ 100,000              
2019 Employee Incentive Plan, Transferred From 2014 and 2008 Stock Incentive Plans                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Common stock reserved for future issuance (in shares)   21,770,029            
2019 Employee Incentive Plan                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Common stock reserved for future issuance (in shares)   8,004,000            
Annual increase in capital shares reserved for future issuance (in shares)   7,120,000            
Percentage of outstanding stock maximum   4.00%            
2019 Employee Stock Purchase Plan | Employee Stock                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Common stock reserved for future issuance (in shares)   890,000            
Annual increase in capital shares reserved for future issuance (in shares)   2,670,000            
Percentage of outstanding stock maximum   1.00%            
Maximum payroll deduction   15.00%            
Purchase price of common stock (percent)   85.00%            
Maximum number of shares per employee (in shares)   500            
Maximum value per employee   $ 12,500            
Maximum                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Stock-based compensation related to capitalized internal-use software (less than)             $ 100,000  
Maximum | 2019 Employee Stock Purchase Plan | Employee Stock                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Ownership percentage threshold to participate   5.00%