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Stock-Based Compensation - Schedule of Employee Awards and Non-employee Director Award Plan Activity (Parenthetical) (Detail) - $ / shares
3 Months Ended 9 Months Ended
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Sep. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period       4 years
Options        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period   4 years 4 years 36 months
Weighted average exercise price of the stock options granted   $ 1.34 $ 1.25  
Weighted average grant date fair value of the stock options granted   $ 0.99 $ 0.93  
Risk-free interest rate   0.39% 0.79%  
Expected life   5 years 8 months 1 day 5 years 8 months 1 day  
Volatility rate   93.83% 93.83%  
Dividend yield   0.00% 0.00%  
Vesting rights percentage       25.00%
Employees Awards | RSUs        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Restricted stock units weighted average grant date fair value $ 1.70 $ 1.34 $ 1.25  
Vesting period 4 years 4 years 4 years  
Employees Awards | Market RSU's        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Restricted stock units weighted average grant date fair value $ 3.77      
Vesting date May 22, 2023      
Employees Awards | Market RSU's | Index Target Less Than 25th Percentile        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting rights percentage 0.00%      
Employees Awards | Market RSU's | Index Target 25th Percentile        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting rights percentage 50.00%      
Employees Awards | Market RSU's | Index Target 50th Percentile        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting rights percentage 100.00%      
Employees Awards | Market RSU's | Index Target 75th Percentile        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting rights percentage 200.00%      
Employees Awards | Market RSU's | Index Target 90th Percentile or Higher        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting rights percentage 300.00%      
Non-employee Directors Awards | RSUs        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Restricted stock units weighted average grant date fair value   $ 1.34 $ 1.17