Annual report pursuant to Section 13 and 15(d)

Subsequent Events - Additional Information (Detail)

v3.6.0.2
Subsequent Events - Additional Information (Detail) - USD ($)
 1 Months Ended 3 Months Ended 12 Months Ended
Jan. 02, 2017
Mar. 16, 2017
Feb. 28, 2017
Feb. 17, 2017
Jan. 31, 2017
Oct. 30, 2015
Dec. 31, 2016
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Sep. 30, 2016
Sep. 18, 2015
Mar. 17, 2014
Subsequent Event [Line Items]                          
Stock Issued During Period, Value, New Issues               $ 53,000,000          
Payments of Stock Issuance Costs               $ 0 $ 0 $ 32,000      
Percentage Of Placement Agent Fee               10.00%          
Warrants Issued           139,592              
Class of Warrant or Right, Number of Securities Called by Warrants or Rights             7.00 7.00          
Class of Warrant or Right, Exercise Price of Warrants or Rights             $ 2,500 $ 2,500       $ 7.00  
Warrant Purchase Price Per Unit               $ 50,000          
Equity Method Investment, Ownership Percentage                         35.00%
National Holdings Corporation [Member]                          
Subsequent Event [Line Items]                          
Class of Warrant or Right, Exercise Price of Warrants or Rights             $ 3.25 $ 3.25     $ 3.25    
Private Placement [Member] | National Holdings Corporation [Member]                          
Subsequent Event [Line Items]                          
Payments of Stock Issuance Costs             $ 3,900,000            
Percentage Of Placement Agent Fee             10.00%            
Subsequent Event [Member] | Mustang Bio, Inc [Member]                          
Subsequent Event [Line Items]                          
Stock Issued During Period, Value, New Issues     $ 1,700,000                    
Shares Issued, Price Per Share     $ 5.73                    
Equity Method Investment, Ownership Percentage         40.00%                
Subsequent Event [Member] | National Holdings Corporation [Member] | Mustang Bio, Inc [Member]                          
Subsequent Event [Line Items]                          
Warrants Issued         2,134,193                
Class of Warrant or Right, Number of Securities Called by Warrants or Rights         2,500                
Class of Warrant or Right, Exercise Price of Warrants or Rights         $ 8.50                
Warrant Expiration Term         5 years                
Warrant Purchase Price Per Unit         $ 65,000                
Subsequent Event [Member] | Caribe BioAdvisors LLC [Member]                          
Subsequent Event [Line Items]                          
Payments for Fees $ 60,000                        
Subsequent Event [Member] | Private Placement [Member] | National Holdings Corporation [Member]                          
Subsequent Event [Line Items]                          
Payments of Stock Issuance Costs         5,500,000                
Proceeds from Issuance of Private Placement         $ 55,500,000                
Percentage Of Placement Agent Fee         10.00%                
Warrants Issued         853,667                
Percentage Of Shares Issued To Placement Agent         10.00%                
Subsequent Event [Member] | City Of Hope [Member]                          
Subsequent Event [Line Items]                          
Payments for Fees       $ 100,000                  
Revenue Recognition Milestone Method Payments Due       $ 100,000                  
Subsequent Event [Member] | Opus Credit Facility [Member]                          
Subsequent Event [Line Items]                          
Proceeds from Lines of Credit   $ 2,000,000