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 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Class Of Stock [Line Items]        
Stock-based compensation expense $ 2,216 $ 2,156 $ 4,107 $ 3,451
Cost of Revenue        
Class Of Stock [Line Items]        
Stock-based compensation expense 212 160 403 279
Research and Development        
Class Of Stock [Line Items]        
Stock-based compensation expense 250 207 473 338
Sales and Marketing        
Class Of Stock [Line Items]        
Stock-based compensation expense 347 314 662 541
General and Administrative        
Class Of Stock [Line Items]        
Stock-based compensation expense $ 1,407 $ 1,475 $ 2,569 $ 2,293