Annual report pursuant to Section 13 and 15(d)

Classification of Compensation Expense Associated with Share-Based Payments (Detail)

v3.10.0.1
Classification of Compensation Expense Associated with Share-Based Payments (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Allocated Share-based Compensation Expense $ 2,768 $ 2,207 $ 3,065
Cost of Revenue      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Allocated Share-based Compensation Expense 420 207 226
Sales and Marketing      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Allocated Share-based Compensation Expense 535 235 477
General and Administrative      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Allocated Share-based Compensation Expense 1,440 1,469 2,051
Engineering and Development      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Allocated Share-based Compensation Expense $ 373 $ 296 $ 311