Quarterly report pursuant to Section 13 or 15(d)

Summary of Unvested Stock Option Activity (Detail)

v3.22.2.2
Summary of Unvested Stock Option Activity (Detail) - $ / shares
3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Granted $ 0 $ 0.49 $ 0 $ 0.72
Stock Options        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Beginning Balance     5,000  
Vested     (2,000)  
Forfeited or cancelled     (1,000)  
Ending Balance 2,000   2,000  
Beginning Balance     $ 17.31  
Vested     20.99  
Forfeited or cancelled     17.03  
Ending Balance $ 14.76   $ 14.76