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Line of Credit - Related Party (Details) - USD ($)
1 Months Ended 12 Months Ended
May 31, 2019
Dec. 31, 2021
Dec. 31, 2020
May 23, 2019
Jan. 31, 2019
Line of Credit - Related Party [Abstract]          
Line of credit, maximum borrowing capacity         $ 10,000,000
Warrants to purchase common stock (in shares) 500,000        
Exercise price of warrant (in dollars per share)       $ 7.00  
Proceeds from warrants exercised $ 2,500,000        
Line of credit borrowings   $ 0      
Fair value of warrants   500,000      
Warrants issuance value   $ 696,000      
Expected life   6 years 6 years    
Expected volatility   91.70% 97.90%    
Risk free interest rate   0.66% 1.26%    
Expected dividend   0.00% 0.00%    
Amortization of interest expense   $ 174,000 $ 87,000    
Warrants [Member]          
Line of Credit - Related Party [Abstract]          
Expected life   7 years      
Expected volatility   98.00%      
Risk free interest rate   2.05%      
Expected dividend   0.00%      
Mr. Uihlein [Member]          
Line of Credit - Related Party [Abstract]          
Warrants to purchase common stock (in shares)   1,000,000      
Exercise price of warrant (in dollars per share)   $ 5      
Unsecured Line of Credit [Member] | Mr. Uihlein [Member]          
Line of Credit - Related Party [Abstract]          
Line of credit, current borrowing capacity   $ 10,000,000      
Short term borrowing interest rate   0.13%      
Borrowings repayment due date   Dec. 31, 2022