Annual report pursuant to Section 13 and 15(d)

Pre-Merger Financing (Details)

v3.20.4
Pre-Merger Financing (Details)
 12 Months Ended
Jun. 29, 2020
USD ($)
shares
Dec. 31, 2020
USD ($)
Director
Interest
$ / shares
shares
Dec. 31, 2019
USD ($)
shares
Nov. 19, 2020
$ / shares
shares
Nov. 05, 2020
shares
Pre-Merger Financing [Abstract]          
Common stock issued (in shares) | shares   10,882,495 2,852,485    
Fair value change in derivative and warrant liabilities   $ (1,486,000) $ (499,000)    
Issuance costs attributed to pre-merger financing   $ 1,769,000 $ 0    
Rexahn [Member] | Minimum [Member]          
Pre-Merger Financing [Abstract]          
Exercise price (in dollars per share) | $ / shares   $ 38.40      
Securities Purchase Agreement [Member]          
Pre-Merger Financing [Abstract]          
Common stock issued (in shares) | shares 1,249,996     3,749,992 3,749,992
Number of trading days   10 days      
Securities Purchase Agreement [Member] | Private Ocuphire [Member]          
Pre-Merger Financing [Abstract]          
Number of directors | Director   5      
Securities Purchase Agreement [Member] | Rexahn [Member]          
Pre-Merger Financing [Abstract]          
Number of directors | Director   1      
Securities Purchase Agreement [Member] | Investors [Member]          
Pre-Merger Financing [Abstract]          
Total investment $ 21,150,000        
Securities Purchase Agreement [Member] | Directors [Member]          
Pre-Merger Financing [Abstract]          
Total investment $ 300,000        
Series A Warrants [Member]          
Pre-Merger Financing [Abstract]          
Exercise price (in dollars per share) | $ / shares       $ 4.4795  
Exercisable term   5 years      
Warrant issued (in shares) | shares       5,665,838  
Percentage of reset price   120.00%      
Fair market value of warrants   $ 25,800,000      
Fair value of warrants exceeded   21,150,000      
Pre-merger financing   $ 4,700,000      
Number of interest | Interest   1      
Fair value change in derivative and warrant liabilities   $ 2,100,000      
Series A Warrants [Member] | Offset to Additional Capital [Member]          
Pre-Merger Financing [Abstract]          
Issuance costs attributed to pre-merger financing   1,100,000      
Series A Warrants [Member] | Interest Expense [Member]          
Pre-Merger Financing [Abstract]          
Issuance costs attributed to pre-merger financing   $ 700,000      
Series A Warrants [Member] | Risk-Free Interest Rate [Member]          
Pre-Merger Financing [Abstract]          
Percentage of measurement input   0.004      
Series A Warrants [Member] | Expected Volatility [Member]          
Pre-Merger Financing [Abstract]          
Percentage of measurement input   0.8360      
Series A Warrants [Member] | Expected Term [Member]          
Pre-Merger Financing [Abstract]          
Expected life   5 years      
Series A Warrants [Member] | Expected Dividend Yield Rate [Member]          
Pre-Merger Financing [Abstract]          
Percentage of measurement input   0      
Series B Warrants [Member]          
Pre-Merger Financing [Abstract]          
Exercise price (in dollars per share) | $ / shares   $ 0.0001      
Warrant issued (in shares) | shares   665,836      
Remaining issuable shares (in shares) | shares   0      
Number of trading days including reset date   45 days      
Period of issuance date   6 months      
Period of after issuance date   1 year      
Pre-money valuation amount   $ 10,000,000      
Series B Warrants [Member] | Minimum [Member]          
Pre-Merger Financing [Abstract]          
Number of trading days   9 days      
the Warrants [Member]          
Pre-Merger Financing [Abstract]          
Issuance costs attributed to pre-merger financing   $ 1,800,000      
Placement agent cash fee   1,600,000      
Legal and other fees   $ 200,000