Registration of securities issued in business combination transactions

Merger Agreement and Pre-Merger Financing (Details)

v3.20.2
Merger Agreement and Pre-Merger Financing (Details)
 6 Months Ended
Jun. 29, 2020
USD ($)
item
Jun. 30, 2020
USD ($)
Dec. 31, 2019
USD ($)
Jun. 30, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Business Acquisition [Line Items]            
Cash and cash equivalents   $ 9,208,951 $ 9,219,547 $ 7,310,049 $ 8,744,301 $ 8,899,154
Adjustment to Exchange Ratio Formula $ 100,000          
Cash Requirement 0          
Termination Fee $ 750,000          
Contingent Value Rights, License, Term   15 years        
Contingent Value Rights, Percentage 90.00%          
Contingent Value Rights, IP, Percentage 75.00%          
Contingent Value Rights, IP, Term   10 years        
Pre-Merger Financing $ 21,150,000          
Pre-Merger Valuation $ 120,000,000          
Pre-Merger Financing Ownership Of Combined Company 15.00%          
Average Of Five Lowest Volume-Weighted Average Trading Prices 85.00%          
Cash At Closing $ 0          
Post-Merger [Member]            
Business Acquisition [Line Items]            
Number Of Board Members | item 7          
Rexahn [Member]            
Business Acquisition [Line Items]            
Share Ownership Percentage 14.30%          
Number Of Board Members | item 1          
Ocuphire [Member]            
Business Acquisition [Line Items]            
Share Ownership Percentage 85.70%          
Number Of Board Members | item 6          
0 Cash Balance [Member] | Rexahn [Member]            
Business Acquisition [Line Items]            
Share Ownership Percentage 11.20%          
0 Cash Balance [Member] | Ocuphire [Member]            
Business Acquisition [Line Items]            
Share Ownership Percentage 88.80%          
Minimum [Member] | Current Shareholders [Member]            
Business Acquisition [Line Items]            
Share Ownership Percentage 9.10%          
Minimum [Member] | Post-Merger [Member]            
Business Acquisition [Line Items]            
Cash and cash equivalents $ 3,200,000          
Estimated Cash Delivery Upon Closing 0          
Maximum [Member] | Post-Merger [Member]            
Business Acquisition [Line Items]            
Cash and cash equivalents 6,000,000          
Estimated Cash Delivery Upon Closing $ 500,000