Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity - Summary of Stock-based Compensation Expense Recognized in Income Statement (Details)

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Stockholders' Equity - Summary of Stock-based Compensation Expense Recognized in Income Statement (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Class Of Stock [Line Items]    
Stock-based compensation expense $ 3,381 $ 1,891
Cost of Revenue    
Class Of Stock [Line Items]    
Stock-based compensation expense 273 191
Research and Development    
Class Of Stock [Line Items]    
Stock-based compensation expense 331 223
Sales and Marketing    
Class Of Stock [Line Items]    
Stock-based compensation expense 548 315
General and Administrative    
Class Of Stock [Line Items]    
Stock-based compensation expense $ 2,229 $ 1,162