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Stock-Based Compensation Arrangements - Additional Information (Detail) - USD ($)
1 Months Ended 12 Months Ended
Oct. 20, 2016
Jul. 21, 2015
Dec. 31, 2016
Dec. 31, 2015
Aug. 09, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Weighted-average fair value     $ 0.15 $ 0.16  
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Share-based Awards Other than Options     $ 2,705,027 $ 2,248,591  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Grant Date Intrinsic Value     $ 0.11    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition     2 years 9 months 18 days 3 years 1 month 10 days  
Granted,Weighted Avg.Exercise Price     $ 0.16 $ 0.17  
Employment Agreement Two [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross 5,000,000        
Granted,Weighted Avg.Exercise Price $ 0.17544        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights These options will vest as to 25% of the shares on July 29, 2017 and as to an additional 2.083% of the shares on the last day of each successive month thereafter        
Share based Compensation Arrangements By Share based Payment Award Options Grants In Period Percentage     5.00%    
Conversion of Stock, Shares Converted 5,626,257        
Employment Agreement One [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross 3,738,933        
Granted,Weighted Avg.Exercise Price $ 0.17544        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights These options will vest as to 25% of the shares on August 15, 2017, and as to an additional 2.083% of the shares monthly thereafter.        
Share based Compensation Arrangements By Share based Payment Award Options Grants In Period Percentage     1.00%    
Common Stock [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock Issued During Period, Shares, Employee Stock Purchase Plans     229,951    
Employee Stock Purchase Plan [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock purchase price     85.00%    
Weighted-average purchase price     $ 0.08 0.10  
Weighted-average fair value     $ 0.09 $ 0.12  
Compensation expense     $ 2,921 $ 4,053  
Employee Stock Purchase Plan [Member] | Common Stock [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock Issued During Period, Shares, Employee Stock Purchase Plans     229,951 203,879  
2013 Plan [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based Compensation Payment Award, Number of Shares Authorized     5,000,000   8,860,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross   30,000,000 10,622,392    
2013 Plan [Member] | Common Stock [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross     20,729,144    
2004 Plan [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based Compensation Payment Award, Number of Shares Authorized         2,435,500