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Line of Credit - Related Party - Additional Information (Detail) - USD ($)
6 Months Ended
May 19, 2019
Jun. 30, 2021
Jun. 30, 2020
Apr. 16, 2021
Jan. 31, 2019
Line of Credit Facility [Line Items]          
Short term borrowing interest rate       2.00%  
Number of securities called by warrant   500,000      
Warrant value   $ 696,000      
Expected life   6 years 6 years    
Expected Volatility   91.00% 100.00%    
Expected dividend   0.00% 0.00%    
Risk free interest rate   0.57% 1.55%    
Amortization of interest expense   $ 43,000 $ 43,000    
Proceeds from warrants exercised $ 2,500,000        
Unsecured Line Of Credit | Director          
Line of Credit Facility [Line Items]          
Line of credit facility         $ 10,000,000
Short term borrowing interest rate   0.13%      
Number of securities called by warrant   1,000,000      
Exercise price of warrant   $ 5      
Line of credit current   $ 0      
Line of Credit Facility Current Borrowing Capacity   $ 10,000,000      
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%