Summary of Significant Accounting Policies - Amounts Recognized in Consolidated Statements of Operations and Comprehensive Loss Net (Detail) - USD ($) $ in Thousands |
12 Months Ended | |
---|---|---|
Dec. 31, 2019 |
Dec. 31, 2018 |
|
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] | ||
Total stock-based compensation | $ 2,287 | $ 1,550 |
Research and Development [Member] | ||
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] | ||
Total stock-based compensation | 321 | 379 |
Selling, General and Administrative [Member] | ||
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] | ||
Total stock-based compensation | $ 1,966 | $ 1,171 |