Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity - Additional Information (Detail)

v3.7.0.1
Stockholders' Equity - Additional Information (Detail) - USD ($)
1 Months Ended 3 Months Ended 12 Months Ended
Sep. 09, 2016
Jan. 31, 2017
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Sep. 30, 2016
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Employee Stock Purchase Plan to eligible employees, Reckoning fair value percentage during offering period     85.00%      
Employee Stock Purchase Plan to eligible employees, compensation expense recognized     $ 35,000 $ 27,000    
Research And Development Expense     8,404,000      
General and Administrative Expense     7,985,000      
Share-based Compensation     $ 2,929,000 2,866,000    
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate     0.00%      
Warrants Issued   853,677        
Percentage Of Shares Issued To Placement Agent     10.00%      
Longterm Incentive Program [Member]            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition     8 years 3 months 18 days      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value     $ 1,500,000      
Capital Units, Authorized   100,000,000        
Share-based Compensation     $ 100,000      
Dr. Rosenwald [Member] | Longterm Incentive Program [Member]            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period   552,698        
Mustang [Member]            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Proceeds from Issuance of Private Placement   $ 8,536,774        
Mustang [Member] | Private Placement [Member]            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Class of Warrant or Right, Exercise Price of Warrants or Rights     $ 8.50      
Stock Issued During Period, Value of Warrants Excercised     $ 65,000      
Avenue Therapeutics, Inc. [Member]            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Research And Development Expense     2,000 5,000    
General and Administrative Expense     2,000 5,000    
Allocated Share-based Compensation Expense     $ 5,000 9,000    
Mustang Bio, Inc [Member]            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Aggregate Number of Shares of Common Stock,Percentage     2.50%      
Stock Issuance Costs     $ 1,200,000      
Mustang Bio, Inc [Member] | Private Placement [Member]            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Stock Issued During Period Shares warrants Exercised     2,500      
Journey Medical Corporation [Member] | Employee [Member]            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures     290,000      
Checkpoint Therapeutics, Inc [Member]            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
General and Administrative Expense     $ 100,000      
Allocated Share-based Compensation Expense     1,000,000 1,100,000    
Share-based Compensation     400,000 800,000    
JMC [Member]            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Allocated Share-based Compensation Expense     46,000 200,000    
Helocyte Inc [Member]            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Allocated Share-based Compensation Expense     47,000      
Helocyte Inc [Member] | Non-employee [Member]            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition         1 month 6 days  
Share-based Compensation     37,000 62 $ 62,000  
Cellvation Inc [Member]            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Allocated Share-based Compensation Expense     8,000      
Cellvation Inc [Member] | Chief Executive Officer [Member]            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Share-based Compensation     5,000 0    
Cellvation Inc [Member] | Non-employee [Member]            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Share-based Compensation     $ 3,000 0    
National Holdings Corporation [Member]            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Class of Warrant or Right, Exercise Price of Warrants or Rights           $ 3.25
National Holdings Corporation [Member] | Private Placement [Member]            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Percentage Of Placement Agent Fee 10.00%          
Proceeds from Issuance of Private Placement   $ 55,500,000        
Warrants Issued   2,134,193        
Private Placement Stock Units Shares To Be Issued     10,000      
Percentage Of Shares Issued To Placement Agent   10.00%        
National Holdings Corporation [Member] | Mustang Bio, Inc [Member]            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Proceeds from Issuance of Private Placement     $ 64,000      
Warrants Issued     6,400      
Payments of Stock Issuance Costs     $ 5,500,000      
National Holdings Corporation [Member] | Mustang Bio, Inc [Member] | Private Placement [Member]            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Percentage Of Placement Agent Fee     10.00%      
Proceeds from Issuance of Private Placement     $ 400,000      
Warrants Issued     16,000      
Payments of Stock Issuance Costs     $ 42,000      
Research and Development Expense [Member]            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Allocated Share-based Compensation Expense     800,000 1,300,000    
General and Administrative Expense [Member]            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Allocated Share-based Compensation Expense     2,100,000 1,600,000    
General and Administrative Expense [Member] | Helocyte Inc [Member]            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Share-based Compensation     $ 10,000 500    
Restricted Stock [Member]            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition     2 years 9 months 18 days      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized     3,400,000      
Share-based Compensation     $ 38,000 100,000    
Restricted Stock [Member] | Checkpoint Therapeutics, Inc [Member]            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Share-based Compensation     500,000 300,000    
Restricted Stock [Member] | JMC [Member]            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Share-based Compensation     $ 8,000 $ 35,000    
Restricted Stock Units (RSUs) [Member]            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition     3 years 6 months      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized     800,000      
Employee Stock Option [Member]            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Common Stock issued in connection with the first ESPP offering     177,919      
Common Stock, Capital Shares Reserved for Future Issuance     22,081      
Employee Stock Option [Member] | Journey Medical Corporation [Member]            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate     0.00%