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Line of Credit - Additional Information (Detail) - USD ($)
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Jan. 31, 2019
Jan. 01, 2019
Dec. 31, 2017
Dec. 19, 2017
Line of Credit Facility [Line Items]            
Number of securities called by warrant 500,000     3,579,642    
Warrant value $ 696,000          
Expected life 0 years 0 years        
Expected Volatility 104.00% 103.00%        
Expected dividend 0.00% 0.00%        
Risk free interest rate 2.68% 2.18%        
Amortization of interest expense $ 22,000 $ 84,000        
Director And Shareholder [Member]            
Line of Credit Facility [Line Items]            
Minority interest         7.00%  
Director | Director And Shareholder [Member]            
Line of Credit Facility [Line Items]            
Line of credit current $ 0          
Unsecured Line Of Credit | Director            
Line of Credit Facility [Line Items]            
Line of credit facility           $ 10,000,000
Short term borrowing interest rate     2.70%      
Number of securities called by warrant 1,000,000          
Exercise price of warrant $ 5          
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%