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Stock Options - Summary of Additional Information Regarding Stock Options (Detail)
3 Months Ended
Mar. 31, 2017
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Stock option, outstanding number of shares | shares 2,615,000
Stock option, outstanding weighted average remaining contractual life (years) 1 year 10 months 25 days
Stock option, outstanding weighted average exercise price | $ / shares $ .16
Stock option, exercisable number of shares | shares 2,565,000
Stock option, exercisable weighted average exercise price | $ / shares $ 0.16
Exercise Price Range 0.10 [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Stock option, outstanding number of shares | shares 765,000
Stock option, outstanding weighted average remaining contractual life (years) 1 year 4 months 24 days
Stock option, outstanding weighted average exercise price | $ / shares $ .10
Stock option, exercisable number of shares | shares 765,000
Stock option, exercisable weighted average exercise price | $ / shares $ 0.10
Exercise Price Range 0.14 [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Stock option, outstanding number of shares | shares 150,000
Stock option, outstanding weighted average remaining contractual life (years) 1 year
Stock option, outstanding weighted average exercise price | $ / shares $ .14
Stock option, exercisable number of shares | shares 150,000
Stock option, exercisable weighted average exercise price | $ / shares $ 0.14
Exercise Price Range 0.18 [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Stock option, outstanding number of shares | shares 1,500,000
Stock option, outstanding weighted average remaining contractual life (years) 4 years
Stock option, outstanding weighted average exercise price | $ / shares $ 0.18
Stock option, exercisable number of shares | shares 1,500,000
Stock option, exercisable weighted average exercise price | $ / shares $ 0.18
Exercise Price Range 0.19 [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Stock option, outstanding number of shares | shares 100,000
Stock option, outstanding weighted average remaining contractual life (years) 3 years
Stock option, outstanding weighted average exercise price | $ / shares $ 0.19
Stock option, exercisable number of shares | shares 100,000
Stock option, exercisable weighted average exercise price | $ / shares $ 0.19
Exercise Price Range 0.28 [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Stock option, outstanding number of shares | shares 100,000
Stock option, outstanding weighted average remaining contractual life (years) 3 months 19 days
Stock option, outstanding weighted average exercise price | $ / shares $ .28
Stock option, exercisable number of shares | shares 50,000
Stock option, exercisable weighted average exercise price | $ / shares $ 0.28