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Stock-based Compensation - Expense Related to Stock Options (Detail) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2020 | Mar. 31, 2019
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Stock-based compensation expense related to stock options | $ 410 | $ 492
Research and development, net |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Stock-based compensation expense related to stock options | 136 | 158
Selling, general and administrative |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Stock-based compensation expense related to stock options | $ 274 | $ 334

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