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 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Class Of Stock [Line Items]        
Stock-based compensation expense $ 2,523 $ 1,953 $ 6,630 $ 5,404
Cost of Revenue        
Class Of Stock [Line Items]        
Stock-based compensation expense 205 175 608 454
Research and Development        
Class Of Stock [Line Items]        
Stock-based compensation expense 260 223 733 561
Sales and Marketing        
Class Of Stock [Line Items]        
Stock-based compensation expense 407 318 1,069 859
General and Administrative        
Class Of Stock [Line Items]        
Stock-based compensation expense $ 1,651 $ 1,237 $ 4,220 $ 3,530