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Stock-Based Compensation Expense Related to Stock Options and RSUs (Detail) - Stock Options and Restricted Stock Units - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Stock-Based Compensation Expense $ 640 $ 687
Cost of revenue    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Stock-Based Compensation Expense 40 29
Research and Development Expense    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Stock-Based Compensation Expense 174 114
Selling and Marketing Expense    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Stock-Based Compensation Expense 126 180
General and Administrative Expense    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Stock-Based Compensation Expense $ 300 $ 364