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Intangible Assets - Summary of Estimated Fair Values of Assets Acquired and Liabilities Assumed (Details) - USD ($)
Dec. 31, 2017
Jul. 31, 2016
May 02, 2016
Business Combination Segment Allocation [Line Items]      
Liability assumed (HPI)     $ (1,000,000)
Houston Pharmaceuticals, Inc      
Business Combination Segment Allocation [Line Items]      
Liability assumed (HPI) $ (3,874,000) $ (3,874,000)  
Moleculin LLC      
Business Combination Segment Allocation [Line Items]      
Cash 0    
Property and equipment 8,000    
Intangibles 11,148,000    
Total assets acquired 11,156,000    
Other liabilities assumed, including $470 of notes payable (1,224,000)    
Net assets acquired/total consideration transferred 6,057,000    
Other liabilities assumed, notes payable $ 470,000