Annual report pursuant to Section 13 and 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
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Class Of Stock [Line Items]      
Stock-based compensation expense $ 12,790 $ 9,640 $ 7,294
Cost of Revenue      
Class Of Stock [Line Items]      
Stock-based compensation expense 1,060 845 639
Research and Development      
Class Of Stock [Line Items]      
Stock-based compensation expense 1,314 1,015 776
Sales and Marketing      
Class Of Stock [Line Items]      
Stock-based compensation expense 2,355 1,558 1,142
General and Administrative      
Class Of Stock [Line Items]      
Stock-based compensation expense $ 8,061 $ 6,222 $ 4,737