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Line of Credit - Additional Information (Detail) - USD ($)
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Jan. 01, 2019
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 6 years 6 years      
Expected Volatility 100.00% 104.00%      
Expected dividend 0.00% 0.00%      
Risk free interest rate 1.55% 2.68%      
Amortization of interest expense $ 22,000 $ 22,000      
Unsecured Line Of Credit | Director          
Line of Credit Facility [Line Items]          
Line of credit facility         $ 10,000,000
Short term borrowing interest rate     1.60%    
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%