Annual report pursuant to Section 13 and 15(d)

Net loss per share, Anti-dilutive Securities Excluded from Computation of Net Loss per Share (Details)

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Net loss per share, Anti-dilutive Securities Excluded from Computation of Net Loss per Share (Details) - shares
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Series A and Series B Warrants [Member]    
Net Loss Per Share [Abstract]    
Antidilutive securities excluded from computation of net loss per share (in shares) 6,331,674 0
Stock Options [Member]    
Net Loss Per Share [Abstract]    
Antidilutive securities excluded from computation of net loss per share (in shares) 1,784,198 1,037,705
Stock Options [Member] | Rexahn [Member]    
Net Loss Per Share [Abstract]    
Antidilutive securities excluded from computation of net loss per share (in shares) 123 0
Restricted Stock Awards [Member]    
Net Loss Per Share [Abstract]    
Antidilutive securities excluded from computation of net loss per share (in shares) 40,000 0
Warrants [Member] | Rexahn [Member]    
Net Loss Per Share [Abstract]    
Antidilutive securities excluded from computation of net loss per share (in shares) 66,538 0