v3.19.3
Note 10 - Warrants (Details Textual)
9 Months Ended 12 Months Ended
May 03, 2019
USD ($)
$ / shares
shares
Jan. 31, 2016
USD ($)
$ / shares
shares
Nov. 30, 2015
USD ($)
$ / shares
shares
Jul. 01, 2010
Sep. 30, 2019
USD ($)
Dec. 31, 2018
USD ($)
shares
Dec. 31, 2017
USD ($)
Nov. 24, 2015
shares
Fair Value Adjustment of Warrants         $ 94,000 $ 98,000 $ (12,000)  
Alliqua Warrants Assumed in Merger [Member]                
Class of Warrant or Right, Outstanding | shares 38,945              
Alliqua Warrants Assumed in Merger [Member] | Minimum [Member]                
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares $ 26.40              
Alliqua Warrants Assumed in Merger [Member] | Maximum [Member]                
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares $ 28.20              
Warrant to Purchase Series A Convertible Preferred Stock Under Oxford Loan Agreement [Member]                
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | shares   131,810 197,715         11,829
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares   $ 0.2276 $ 0.2276          
Warrants Not Settleable in Cash, Fair Value Disclosure   $ 22,000 $ 33,000          
Percentage of Note Payable Principal       20.00%        
Class of Warrants or Right, Exercisable, Term   10 years 10 years 5 years        
Warrant to Purchase Series A Convertible Preferred Stock Under Oxford Loan Agreement [Member] | Measurement Input, Expected Term [Member]                
Warrants and Rights Outstanding, Measurement Input   10 10          
Warrant to Purchase Series A Convertible Preferred Stock Under Oxford Loan Agreement [Member] | Measurement Input, Expected Term [Member] | Minimum [Member]                
Warrants and Rights Outstanding, Measurement Input       3.92        
Warrant to Purchase Series A Convertible Preferred Stock Under Oxford Loan Agreement [Member] | Measurement Input, Risk Free Interest Rate [Member]                
Warrants and Rights Outstanding, Measurement Input   0.0209 0.0207          
Warrant to Purchase Series A Convertible Preferred Stock Under Oxford Loan Agreement [Member] | Measurement Input, Price Volatility [Member]                
Warrants and Rights Outstanding, Measurement Input   0.686 0.687          
Warrant to Purchase Series A Convertible Preferred Stock Under Oxford Loan Agreement [Member] | Measurement Input, Conversion Price [Member]                
Warrants and Rights Outstanding, Measurement Input     0.20          
Warrant to Purchase Series A Convertible Preferred Stock Under Oxford Loan Agreement [Member] | Measurement Input, Share Price [Member]                
Warrants and Rights Outstanding, Measurement Input   0.23            
Warrants for Series A Convertible Preferred Stock [Member]                
Warrants and Rights Outstanding           $ 140,000 $ 42,000  
Class of Warrant or Right, Outstanding | shares           330    
Class of Warrants or Right, Exercisable, Term       7 years        
Warrants for Series A Convertible Preferred Stock [Member] | Measurement Input, Expected Term [Member] | Minimum [Member]                
Warrants and Rights Outstanding, Measurement Input           6.92 7.92  
Warrants for Series A Convertible Preferred Stock [Member] | Measurement Input, Expected Term [Member] | Maximum [Member]                
Warrants and Rights Outstanding, Measurement Input       7   7.08 8.08  
Warrants for Series A Convertible Preferred Stock [Member] | Measurement Input, Risk Free Interest Rate [Member]                
Warrants and Rights Outstanding, Measurement Input             2.28  
Warrants for Series A Convertible Preferred Stock [Member] | Measurement Input, Risk Free Interest Rate [Member] | Minimum [Member]                
Warrants and Rights Outstanding, Measurement Input       0.0146   2.56    
Warrants for Series A Convertible Preferred Stock [Member] | Measurement Input, Risk Free Interest Rate [Member] | Maximum [Member]                
Warrants and Rights Outstanding, Measurement Input       0.0266   2.59    
Warrants for Series A Convertible Preferred Stock [Member] | Measurement Input, Price Volatility [Member]                
Warrants and Rights Outstanding, Measurement Input             71.00  
Warrants for Series A Convertible Preferred Stock [Member] | Measurement Input, Price Volatility [Member] | Minimum [Member]                
Warrants and Rights Outstanding, Measurement Input       0.736   76.84    
Warrants for Series A Convertible Preferred Stock [Member] | Measurement Input, Price Volatility [Member] | Maximum [Member]                
Warrants and Rights Outstanding, Measurement Input       0.815        
Warrants for Series A Convertible Preferred Stock [Member] | Measurement Input, Conversion Price [Member]                
Warrants and Rights Outstanding, Measurement Input       0.2276        
Warrant Issued In Connection With Term Loan A and B [Member]                
Fair Value Adjustment of Warrants           $ 98,000 $ (12,000)  
Alliqua Biomedical, Inc. [Member] | Warrant to Purchase Common Stock Converted in Merger [Member]                
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | shares 11,829              
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares $ 6.34              
Exchange of Warrants Upon Merger $ 234,000