Annual report pursuant to Section 13 and 15(d)

Related Party Agreements (Details Textual)

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Related Party Agreements (Details Textual) - USD ($)
 1 Months Ended 11 Months Ended 12 Months Ended
Jul. 05, 2017
May 15, 2017
Sep. 13, 2016
Jul. 25, 2017
Jun. 26, 2017
Sep. 30, 2016
Feb. 17, 2015
Dec. 31, 2015
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
May 17, 2017
Mar. 15, 2015
Agreement Description Terms                 (i) issue annually to Fortress, on the anniversary date of the Founders Agreement, shares of common stock equal to two and one half percent (2.5%) of the fully-diluted outstanding equity of Avenue at the time of issuance; (ii) pay an equity fee in shares of Avenue common stock, payable within five (5) business days of the closing of any equity or debt financing for Avenue or any of its respective subsidiaries that occurs after the effective date of the Founders Agreement and ending on the date when Fortress no longer has majority voting control in Avenues voting equity, equal to two and one half percent (2.5%) of the gross amount of any such equity or debt financing; and (iii) pay a cash fee equal to four and one half percent (4.5%) of Avenues annual net sales, payable on an annual basis, within ninety (90) days of the end of each calendar year. In the event of a change in control (as it is defined in the Founders Agreement), Fortress will be paid a one-time change in control fee equal to five (5x) times the product of (i) net sales for the twelve (12) months immediately preceding the change in control and (ii) four and one-half percent (4.5%).        
Stock Issued During Period, Value, New Issues                 $ 948,000 $ 5,000      
Stockholders' Equity, Period Increase (Decrease)                 632,000        
Debt Instrument, Periodic Payment, Principal       $ 3,500,000                  
Debt Instrument, Periodic Payment, Interest       $ 100,000                  
Service Agreement Expenses                 500,000 500,000 $ 400,000    
Extend Loan Modification, Reduction to interest Expense                 300,000        
IPO [Member]                          
Number of shares Exchanged         158,125                
Stock Issued During Period, Value, New Issues         $ 6,325,000                
Shares Issued, Price Per Share         $ 6.00                
Deferred Offering Costs         $ 2,300,000                
Financing Fee         $ 900,000                
Common Stock [Member]                          
Stock Issued During Period, Value, New Issues                 0 0      
Stockholders' Equity, Period Increase (Decrease)                 0        
Fortress Note [Member]                          
Debt Instrument, Interest Rate, Stated Percentage                         8.00%
Interest Expense, Debt                 74,000 200,000 200,000    
Fortress Note [Member] | Maximum [Member]                          
Annual Consulting Fee                 $ 400,000        
Debt Instrument, Interest Rate, Stated Percentage                 8.00%     8.00%  
Fortress Note [Member] | Minimum [Member]                          
Annual Consulting Fee                 $ 100,000        
Debt Instrument, Interest Rate, Stated Percentage                 2.00%     2.00%  
Fortress Note [Member] | IPO [Member]                          
Stockholders' Equity, Period Increase (Decrease)   $ 500,000                      
Percentage Of Conversion Shares         2.50%                
NSC Notes Memebers [Member]                          
Long-term Debt, Gross             $ 3,000,000 $ 3,000,000 $ 0 3,000,000 $ 3,000,000    
Interest Expense, Debt               $ 200,000 300,000 400,000      
Debt Instrument, Periodic Payment, Interest $ 2,000                        
NSC Notes Memebers [Member] | IPO [Member]                          
Stock Issued During Period, Value, New Issues         $ 125,000                
Deferred Offering Costs         3,000,000                
National Holdings, Inc. [Member]                          
Long-term Debt           $ 3,000,000              
Business Acquisition, Percentage of Voting Interests Acquired           56.60%              
Placement Fee, Percentage           10.00%              
Debt Instrument, Periodic Payment, Principal           $ 3,000,000              
Debt Instrument, Periodic Payment, Interest           $ 2,000              
Asset Management Income [Member]                          
Annual Consulting Fee             500,000            
Increase In Annual Consulting Fee             1,000,000            
Excess In Net Assets Value             100,000,000            
Asset Management Income [Member] | IPO [Member]                          
Stock Issued During Period, Value, New Issues         166,666                
Due to Related Parties, Current         $ 1,000,000                
Shares Issued, Price Per Share         $ 6.00                
AR Founders Agreement [Member]                          
Amended Founders Agreements Terms     15 years                    
AR Founders Agreement [Member] | Common Stock [Member]                          
Number of shares Exchanged     2,500,000                    
Fortress Biotech, Inc [Member]                          
Long-term Debt, Gross             $ 3,000,000            
Preferred Class A [Member] | AR Founders Agreement [Member]                          
Number of shares Exchanged     250,000                    
Common Class A [Member]                          
Stock Issued During Period, Value, New Issues                 0 $ 0      
Stockholders' Equity, Period Increase (Decrease)                 $ 0        
Common Class A [Member] | AR Founders Agreement [Member]                          
Number of shares Exchanged     2,300,000