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Stock-Based Compensation and Employee Benefit Plans - Summary of Compensation Expense by Type of Award (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |
Total stock-based compensation | $ 3,036 | $ 3,396 | $ 1,735
Stock Options [Member] |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |
Total stock-based compensation | 2,072 | 2,649 | 1,546
ESPP [Member] |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |
Total stock-based compensation | $ 964 | $ 747 | $ 189

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