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, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Class Of Stock [Line Items]        
Stock-based compensation expense $ 1,779 $ 3,186 $ 5,365 $ 6,567
Cost of Revenue        
Class Of Stock [Line Items]        
Stock-based compensation expense 199 259 484 532
Research and Development        
Class Of Stock [Line Items]        
Stock-based compensation expense 227 330 604 661
Sales and Marketing        
Class Of Stock [Line Items]        
Stock-based compensation expense 336 583 1,026 1,131
General and Administrative        
Class Of Stock [Line Items]        
Stock-based compensation expense $ 1,017 $ 2,014 $ 3,251 $ 4,243