Annual report pursuant to Section 13 and 15(d)

Stockholders' Equity - Stock Option Activity (Detail)

v3.20.1
Stockholders' Equity - Stock Option Activity (Detail) - USD ($)
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2019
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]        
Number of shares, Options vested and expected to vest 1,285,501 1,310,501    
Number of shares, Forfeited   (25,000)    
Number of shares, Options exercised 125,000      
Number of shares, Options vested and expected to vest 1,410,501 1,285,501 1,310,501  
Number of shares, Options Exercisable       1,310,501
Weighted average exercise price, Forfeited   $ 4.75    
Weighted Average Exercise Price, Options exercised $ 1.18      
Weighted average exercise price, Options vested and expected to vest 4.30 3.75 $ 3.78  
Weighted average exercise price, Options vested and exercisable       $ 4.54
Weighted average exercise price, Options outstanding $ 4.30 $ 3.75 $ 3.78 $ 4.30
Total Weighted average intrinsic value, Options vested and expected to vest   $ 1,351,080    
Total Weighted average intrinsic value, Options vested and expected to vest $ 684,752   $ 1,351,080  
Total weighted average intrinsic value, Options exercised $ 173,750      
Total weighted average intrinsic value, Exercisable       $ 545,752
Weighted average remaining contractual life (years), Options vested and expected to vest 2 years 3 months 29 days 2 years 11 months 5 days 3 years 11 months 12 days  
Weighted average remaining contractual life (years), Exercisable as of December 31, 2018 2 years 2 months 12 days      
Weighted average remaining contractual life (years), Options vested and exercisable 2 years 2 months 12 days