Annual report pursuant to Section 13 and 15(d)

Subsequent Events(Additional Information) (Detail)

v3.8.0.1
Subsequent Events(Additional Information) (Detail) - USD ($)
1 Months Ended 12 Months Ended
Jan. 31, 2018
Jan. 24, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 19, 2017
Subsequent Event [Line Items]            
Class of Warrant or Right, Exercise Price of Warrants or Rights           $ 7.00
Proceeds from Warrant Exercises     $ 0 $ 60,750 $ 1,272,627  
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right     38,100 38,100    
Subsequent Event [Member]            
Subsequent Event [Line Items]            
Class of Warrant or Right, Exercise Price of Warrants or Rights   $ 10.00        
Proceeds from Warrant Exercises $ 39,375          
Warrants Exercised For Cash 17,500          
Purchase Of Common Stock   3,000,000        
Purchase Of Warrants   1,200,000        
Stock Purchase Price   $ 10.00        
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right   0.4        
Warrants Purchased value   $ 30,000,000        
Subsequent Event [Member] | Warrant [Member]            
Subsequent Event [Line Items]            
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Exercised 10,000          
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period 7,428