Quarterly report pursuant to Section 13 or 15(d)

Warrants - Additional Information (Detail)

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Warrants - Additional Information (Detail) - $ / shares
 9 Months Ended 12 Months Ended
Jul. 17, 2018
Apr. 06, 2018
Sep. 30, 2018
Dec. 31, 2017
Class of Warrant or Right [Line Items]        
Warrant exercise price   $ 2.00    
Shares of common stock callable by warrants issued 13,800,000      
Warrants issued 13,800,000 900,000 14,700,000 2,177,425
Common stock issued, offering price per share   $ 2.00    
Common stock issued during period   900,000    
Warrant exercisable period   6 months    
Warrant expiration period   5 years    
Capital Unit, Class A [Member]        
Class of Warrant or Right [Line Items]        
Share price per unit $ 1.00      
Number of common stock consist in each unit 1      
Number of warrant consist in each unit 1      
Warrant to purchase of common stock, share 1      
Common stock warrants term 7 years      
Warrant exercise price $ 1.00      
Capital Unit, Class B [Member]        
Class of Warrant or Right [Line Items]        
Share price per unit $ 1.00      
Number of warrant consist in each unit 1      
Warrant to purchase of common stock, share 1      
Common stock warrants term 7 years      
Warrant exercise price $ 1.00      
Capital Unit, Class B [Member] | Series D Preferred Stock [Member]        
Class of Warrant or Right [Line Items]        
Number of preferred stock consist in each unit 1      
Shares of common stock callable by warrants issued 1