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Stock-Based Compensation - Additional Information (Detail) - USD ($)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
May 23, 2019
May 31, 2018
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Non-plan grants outstanding 3,000,256 2,713,979     5,155,263
Expected life 6 years 5 years 8 months 12 days      
Expected dividend yield used in the option valuation model 0.00% 0.00%      
Common stock price $ 2.86   $ 4.01    
Weighted-average grant-date fair values of options granted $ 3.83 $ 3.98      
Unvested option 407,500 54,865      
Unrecognized compensation cost $ 517,000        
Unrecognized compensation cost, recognition period 10 months 27 days        
Options vested 130,490 1,409,804      
Total fair value of options vested $ 491,000 $ 4,519,000      
Number of options granted 530,000 1,011,875      
Intrinsic value of stock options $ 594,302 $ 11,076,199      
Non Qualified Options Plans          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Non-plan stock option grants to employees and non-employees 1,477,379        
Non-plan grants outstanding 500,000        
Incentive Compensation Plan 2009          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of common stock for issuance upon exercise of grants 4,000,000     6,733,334  
Stock awards, available for future grant 4,000,000        
Number of options granted 0        
Minimum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Expected life 5 years        
Maximum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Expected life 10 years        
Restricted Stock | Non Employees Seven Board Of Directors          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Restricted stock awards granted   37,657      
Amortized expense   $ 90,000      
Restricted Stock | Non Employees Two Board Of Directors          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Restricted stock awards granted 19,068        
Amortized expense $ 90,000