Annual report pursuant to Section 13 and 15(d)

Income Taxes, Operating Loss Carryforwards (Details)

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Income Taxes, Operating Loss Carryforwards (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Deferred Tax Assets, Operating Loss Carryforwards, Components [Abstract]    
Federal net operating loss carryforward $ 10,600 $ 10,900
Federal research credit carryforwards 1,100 700
State net operating loss carryforward 2,100 2,200
State research credit carryforwards 0 0
Federal operating loss carryforwards, tax effect 200 4,800
State operating loss carryforwards, tax effect 100 1,400
Utilized federal research credit carryforwards 26 900
Income Tax Uncertainties [Abstract]    
Reserves or related accruals for interest and penalty on income tax expense 0 0
Deferred tax assets relating to net operating loss carryforwards [Abstract]    
Deferred tax assets relating to net operating loss carryforwards 12,780 $ 13,087
Rexahn stockholders [Member]    
Deferred tax assets relating to net operating loss carryforwards [Abstract]    
Deferred tax assets relating to net operating loss carryforwards $ 10,300