Quarterly report pursuant to Section 13 or 15(d)

Pre-Merger Financing (Details)

v3.21.1
Pre-Merger Financing (Details)
3 Months Ended
Feb. 03, 2021
shares
Jun. 29, 2020
USD ($)
shares
Mar. 31, 2021
USD ($)
Director
$ / shares
shares
Mar. 31, 2020
USD ($)
Dec. 31, 2020
shares
Nov. 19, 2020
$ / shares
shares
Nov. 05, 2020
shares
Pre-Merger Financing [Abstract]              
Common stock issued (in shares)     10,929,881   10,882,495    
Fair value change in warrant liabilities and premium conversion derivatives | $     $ (33,829,000) $ 198,000      
Securities Purchase Agreement [Member]              
Pre-Merger Financing [Abstract]              
Common stock issued (in 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]              
Warrant issued (in shares)           5,665,838  
Exercise price (in dollars per share) | $ / shares           $ 4.4795  
Exercisable term     5 years        
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     0.866        
Series A Warrants [Member] | Expected Term [Member]              
Pre-Merger Financing [Abstract]              
Expected life     4 years 9 months 18 days        
Series A Warrants [Member] | Expected Dividend Yield Rate [Member]              
Pre-Merger Financing [Abstract]              
Percentage of measurement input     0        
Series A Warrants [Member] | Waiver Agreements [Member]              
Pre-Merger Financing [Abstract]              
Fair value change in warrant liabilities and premium conversion derivatives | $     $ (33,829,000)        
Series B Warrants [Member]              
Pre-Merger Financing [Abstract]              
Warrant issued (in shares)     1,708,334        
Exercise price (in dollars per share) | $ / shares     $ 0.0001        
Series B Warrants [Member] | Waiver Agreements [Member]              
Pre-Merger Financing [Abstract]              
Aggregate number of shares (in shares) 1,708,334