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Stockholders' Equity - Stock-based Compensation (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Stock-based Compensation Expense        
Stock-based compensation expense $ 6,797 $ 3,854 $ 12,122 $ 6,983
Cost of revenue        
Stock-based Compensation Expense        
Stock-based compensation expense 853 575 1,531 1,009
Research and development        
Stock-based Compensation Expense        
Stock-based compensation expense 1,064 801 1,941 1,438
Sales and marketing        
Stock-based Compensation Expense        
Stock-based compensation expense 1,585 1,224 2,947 2,152
General and administrative        
Stock-based Compensation Expense        
Stock-based compensation expense 3,295 $ 1,254 5,703 $ 2,384
Stock options        
Stock-based Compensation Expense        
Unrecognized stock-based compensation expense 11,366   $ 11,366  
Weighted-average amortization period     2 years 7 months 1 day  
Restricted stock units        
Stock-based Compensation Expense        
Unrecognized stock-based compensation expense 56,023   $ 56,023  
Weighted-average amortization period     3 years 12 days  
ESPP        
Stock-based Compensation Expense        
Unrecognized stock-based compensation expense $ 708   $ 708  
Weighted-average amortization period     5 months