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, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Class Of Stock [Line Items]        
Stock-based compensation expense $ 3,216 $ 2,523 $ 9,783 $ 6,630
Cost of Revenue        
Class Of Stock [Line Items]        
Stock-based compensation expense 187 205 719 608
Research and Development        
Class Of Stock [Line Items]        
Stock-based compensation expense 348 260 1,010 733
Sales and Marketing        
Class Of Stock [Line Items]        
Stock-based compensation expense 630 407 1,761 1,069
General and Administrative        
Class Of Stock [Line Items]        
Stock-based compensation expense $ 2,051 $ 1,651 $ 6,293 $ 4,220