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Equity Incentive Plan - Additional Information (Detail) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Common stock, par value $ 0.0001   $ 0.0001   $ 0.0001
Stock-based compensation     $ 1,996,000 $ 1,639,000  
Restricted Stock Units [Member] | Non Employee Director [Member]          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Stock-based compensation $ 200,000 $ 200,000 $ 400,000 $ 400,000  
Options granted     90,324    
Restricted Stock Units [Member] | Maximum [Member] | Non Employee Director [Member]          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Vesting period     3 years    
Restricted Stock Units [Member] | Minimum [Member] | Non Employee Director [Member]          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Vesting period     1 year    
2019 Plan [Member]          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Percentage of share increase     5.00%    
Common stock options authorized under plan 9,626,451   9,626,451    
Common stock, par value $ 0.0001   $ 0.0001    
Common stock options available for issuance 4,396,212   4,396,212    
Options granted     1,277,771    
2019 Plan [Member] | Time Based Vesting Stock Option [Member]          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Vesting period     3 years    
Weighted average fair value granted     $ 1.79 $ 2.21  
Stock-based compensation $ 1,000,000.0 800,000 $ 2,000,000.0 $ 1,600,000  
Unrecognized stock-based compensation expense 6,000,000.0   $ 6,000,000.0    
Unrecognized stock-based compensation expense, period     1 year 10 months 2 days    
2019 Plan [Member] | Time Based Vesting Stock Option [Member] | Maximum [Member]          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Expiration period     10 years    
2019 Plan [Member] | Restricted Stock Units [Member]          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Stock-based compensation $ 0 $ 0 $ 0 $ 0