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Line of Credit - Additional Information (Detail) - USD ($)
3 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Dec. 19, 2017
Line of Credit Facility [Line Items]      
Number of securities called by warrant 500,000    
Warrant value $ 696,000    
Expected life 5 years    
Expected Volatility 103.00%    
Expected dividend 0.00%    
Risk free interest rate 2.18%    
Amortization of interest expense $ 84,000    
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    
Exercise price of warrant $ 5    
Line of credit current $ 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%