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Line of Credit - Additional Information (Detail) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2018
Dec. 31, 2017
Dec. 19, 2017
Line of Credit Facility [Line Items]        
Number of securities called by warrant 500,000 500,000    
Warrant value   $ 696,000    
Expected life   5 years 8 months 12 days    
Expected Volatility   104.00%    
Expected dividend   0.00%    
Risk free interest rate   2.47%    
Amortization of interest expense $ 87,000 $ 256,000    
Director        
Line of Credit Facility [Line Items]        
Minority interest     7.00%  
Unsecured Line Of Credit | Director        
Line of Credit Facility [Line Items]        
Line of credit facility       $ 10,000,000
Short term borrowing interest rate       1.51%
Number of securities called by warrant 1,000,000 1,000,000    
Exercise price of warrant $ 5 $ 5    
Line of credit current $ 0 $ 0    
Warrant        
Line of Credit Facility [Line Items]        
Expected life   7 years    
Expected Volatility   98.00%    
Expected dividend   0.00%    
Risk free interest rate   2.05%