XML 53 R39.htm IDEA: XBRL DOCUMENT v3.23.2
Stock Based Compensation - Summary of Stock-Based Compensation Expense Recognized (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]        
Total stock-based compensation $ 89 $ 346 $ 299 $ 861
Research and development        
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]        
Total stock-based compensation 1 83 67 211
General and Administrative        
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]        
Total stock-based compensation [1] $ 88 $ 263 $ 232 $ 650
[1] No shares of common stock were issued to Board members for the three and six months ended June 30, 2023.