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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
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Mar. 31, 2019 | Mar. 31, 2018
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Stock-Based Compensation Expense | $ 687 | $ 635
Cost of revenue |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Stock-Based Compensation Expense | 29 | 19
Research and Development Expense |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Stock-Based Compensation Expense | 114 | 135
Selling and Marketing Expense |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Stock-Based Compensation Expense | 180 | 158
General and Administrative Expense |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Stock-Based Compensation Expense | $ 364 | $ 323

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