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Equity Incentive Plan - Additional Information (Detail) - USD ($)
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Common stock, par value $ 0.0001   $ 0.0001
Stock-based compensation $ 978,000 $ 825,000  
Restricted Stock Units [Member] | Non Employee Director [Member]      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Stock-based compensation $ 200,000    
Options granted   50,000  
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%    
Shares increases in period 2,126,451    
Common stock options authorized under plan 9,626,451    
Common stock, par value $ 0.0001    
Common stock options available for issuance 4,330,506    
Options granted 1,187,500    
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 $ 2.19  
Stock-based compensation $ 1,000,000 $ 800,000  
Unrecognized stock-based compensation expense $ 7,000,000    
Unrecognized stock-based compensation expense, period 2 years    
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