Quarterly report pursuant to Section 13 or 15(d)

Stock Based Compensation - Summary of Stock Option Activity (Detail)

v3.19.2
Stock Based Compensation - Summary of Stock Option Activity (Detail) - Employee Stock Option [Member] - USD ($)
6 Months Ended 12 Months Ended
Jun. 30, 2019
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of Options, Outstanding 656,494  
Number of Options, Granted 0  
Number of Options, Exercised (80,201)  
Number of Options, Forfeited 0  
Number of Options, Outstanding 576,293 656,494
Number of Options, Exercisable 656,494  
Number of Options, Vested 0  
Number of Options, Exercised (80,201)  
Number of Options, Forfeited 0  
Number of Options, Exercisable 576,293 656,494
Weighted Average Exercise Price, Outstanding $ 5.57  
Weighted Average Exercise Price, Granted 0  
Weighted Average Exercise Price, Exercised 4.99  
Weighted Average Exercise Price, Forfeited 0  
Weighted Average Exercise Price, Outstanding 5.65 $ 5.57
Weighted Average Exercise Price, Exercisable 5.57  
Weighted Average Exercise Price, Vested 0  
Weighted Average Exercise Price, Exercised 4.99  
Weighted Average Exercise Price, Forfeited 0  
Weighted Average Exercise Price, Exercisable $ 5.65 $ 5.57
Weighted Average Remaining Life In Years, Outstanding 4 years 9 months 18 days 4 years 7 months 6 days
Weighted Average Remaining Life In Years, Exercisable 4 years 9 months 18 days 4 years 7 months 6 days
Intrinsic Value, Outstanding $ 104,601 $ 252,887
Intrinsic Value, Exercisable $ 104,601 $ 252,887