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, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Class Of Stock [Line Items]        
Stock-based compensation expense $ 3,186 $ 2,216 $ 6,567 $ 4,107
Cost of Revenue        
Class Of Stock [Line Items]        
Stock-based compensation expense 259 212 532 403
Research and Development        
Class Of Stock [Line Items]        
Stock-based compensation expense 330 250 661 473
Sales and Marketing        
Class Of Stock [Line Items]        
Stock-based compensation expense 583 347 1,131 662
General and Administrative        
Class Of Stock [Line Items]        
Stock-based compensation expense $ 2,014 $ 1,407 $ 4,243 $ 2,569