Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity - Additional Information (Detail)

v3.5.0.2
Stockholders' Equity - Additional Information (Detail) - USD ($)
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Jul. 15, 2016
Jul. 15, 2015
Sep. 30, 2016
May 31, 2016
Mar. 30, 2016
Feb. 29, 2016
Feb. 23, 2016
Jan. 31, 2016
Mar. 31, 2015
Feb. 28, 2014
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
May 26, 2016
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                                
Stock-based compensation weighted-average vesting period                         2 months 19 days      
Employee Stock Purchase Plan to eligible employees, Reckoning fair value percentage during offering period     85.00%               85.00%   85.00%      
Employee Stock Purchase Plan to eligible employees, compensation expense recognized                     $ 30,000 $ 13,000 $ 56,000 $ 28,000    
Common Stock issued in connection with the first ESPP offering                         33,958      
Research And Development Expense                     7,316,000 9,073,000 $ 21,416,000 13,172,000    
Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Gross                         0      
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options     $ 16,000               16,000   $ 16,000      
Share-based Compensation                         8,792,000 11,896,000    
Stock Issued During Period, Shares, New Issues             10,000                  
Stock Issued During Period, Value, Employee Stock Purchase Plan                         81,000      
Payments of Stock Issuance Costs                         49,000 0    
Stock Issued During Period, Value, New Issues                     53,000,000          
Long-Term Incentive Program [Member]                                
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                                
Class of Warrant or Right, Outstanding   500,000                            
Weighted Market Value Percentage of Invested Capital 44.80%                              
Weighted Average Cost Percentage of Capital 30.00%                              
Capital Units, Authorized               100,000,000                
Share-based Compensation                     75,000   200,000      
Share-based Compensation Arrangement by Share-based Payment Award, Percentage of Shares Granted               1.00%                
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost, Total   $ 2,200,000                            
Checkpoint s 2015 Incentive Plan [Member]                                
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                                
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate                             1.50%  
Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Gross                 1,500,000              
Checkpoint [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             $ 7.00                  
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures, Total             $ 126,640                  
Class of Warrant or Right, Number of Securities Called by Warrants or Rights             3,500                  
Warrant Purchase Price Per Unit             $ 45,000                  
Warrants Issued             44,324                  
Proceeds from Issuance of Private Placement             $ 600,000                  
Chief Executive Officer [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 Gross           1,900,000       3,900,000            
Share-based Compensation Arrangement by Share-based Payment Award, Plan Modification, Incremental Compensation Cost           $ 400,000                    
Dr. Rosenwald [Member] | Long-Term 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               510,434                
Mr. Weiss [Member] | Long-Term Incentive Program [Member]                                
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                                
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value               $ 2,400,000                
Mustang [Member]                                
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                                
Allocated Share-based Compensation Expense                           147,000    
Avenue Therapeutics, Inc. [Member]                                
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                                
Employee Stock Purchase Plan to eligible employees, compensation expense recognized                     5,000 15,000 23,000 38,000    
Research And Development Expense                     2,500   11,500      
Allocated Share-based Compensation Expense                     $ 800,000 2,100,000 $ 2,700,000 2,100,000    
Weighted Market Value Percentage of Invested Capital                             44.80%  
Weighted Average Cost Percentage of Capital                             30.00%  
Shares Issued, Price Per Share                             $ 0.146  
Share-based Compensation                       $ 13,000   $ 16,000    
Avenue Therapeutics, Inc. [Member] | Chief Executive Officer [Member]                                
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                                
Stock Issued During Period, Shares, Issued for Services                             1,000,000  
Avenue Therapeutics, Inc. [Member] | Share-based Compensation Award, Tranche One [Member]                                
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                                
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage                             50.00%  
Avenue Therapeutics, Inc. [Member] | Share-based Compensation Award, Tranche Two [Member]                                
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                                
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage                             12.50%  
Avenue Therapeutics, Inc. [Member] | Share-based Compensation Award, Tranche Three [Member]                                
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                                
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage                             50.00%  
Mustang Bio, Inc [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               $ 8.50   $ 8.50      
Stock Issued During Period Shares warrants Exercised     2,500                          
Stock Issued During Period, Value of Warrants Excercised     $ 65,000                          
Stock Issued During Period, Value, New Issues     $ 12,400,000                          
Private Placement Stock Units, Shares To Be Issued     10,000               10,000   10,000      
Warrant Expiration Term     5 years                          
Warrants Issued During Period     478,708                          
Journey Medical Corporation [Member] | Maximum [Member]                                
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                                
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period                         4 years      
Journey Medical Corporation [Member] | Minimum [Member]                                
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                                
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period                         3 years      
Journey Medical Corporation [Member] | Employee [Member]                                
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                                
Weighted Market Value Percentage of Invested Capital                         44.20%      
Weighted Average Cost Percentage of Capital                         25.10%      
Shares Issued, Price Per Share     $ 0.53               $ 0.53   $ 0.53      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures, Total                         310,000      
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate                         0.00%      
Checkpoint Therapeutics, Inc [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 Volatility Rate                             83.00%  
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate                         1.35%      
Share Price                       $ 0.065   $ 0.065 $ 4.39 $ 4.42
Fair Value Assumptions, Weighted Average Volatility Rate                           30.00%    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period                           48 months    
Weighted Average Cost Percentage of Capital                 44.80%              
Fair Value Assumptions, Risk Free Interest Rate                         83.00%      
Share-based Compensation                       $ 2,100,000   $ 2,100,000    
JMC [Member]                                
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                                
Allocated Share-based Compensation Expense                     $ 130,000 279,000 $ 458,000 279,000    
Helocyte Inc [Member]                                
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                                
Research And Development Expense                     900,000   2,900,000      
Allocated Share-based Compensation Expense                     $ 67,000   $ 160,000      
Helocyte Inc [Member] | Consultants [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 Volatility Rate       68.00%                        
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate       1.30%                        
Share Price       $ 0.46                        
Stock Issued During Period, Shares, Issued for Services       508,333 150,000                      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period       127,084                        
Helocyte Inc [Member] | Chief Executive Officer [Member]                                
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                                
Share Price     $ 0.097               $ 0.097   $ 0.097      
Stock Issued During Period, Shares, Issued for Services         1,000,000                      
Share-based Compensation                     $ 17,000          
Helocyte Inc [Member] | Non-employee [Member]                                
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                                
Share-based Compensation                     50,000   $ 118,000      
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%                          
Payments of Stock Issuance Costs     $ 1,200,000                          
Warrants Issued During Period     191,483                          
Percentage Of Shares Issued To Placement Agent     10.00%                          
Research and Development Expense [Member] | Checkpoint s 2015 Incentive Plan [Member]                                
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                                
Share-based Compensation                     20,000   20,000      
Research and Development Expense [Member] | Checkpoint Therapeutics, Inc [Member]                                
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                                
Allocated Share-based Compensation Expense                     400,000   1,600,000      
General and Administrative Expense [Member] | Incentive Plan 2015 [Member]                                
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                                
Share-based Compensation                         $ 1,000,000      
General and Administrative Expense [Member] | Checkpoint s 2015 Incentive Plan [Member]                                
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                                
Share-based Compensation                     300,000          
Restricted Stock [Member]                                
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                                
Stock-based compensation weighted-average vesting period                         2 years 2 months 12 days      
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options     $ 5,600,000               5,600,000   $ 5,600,000      
Share-based Compensation                       0   22,000    
Restricted Stock [Member] | Journey Medical Corporation [Member]                                
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                                
Share-based Compensation                     29,000   $ 95,000      
Restricted Stock [Member] | General and Administrative Expense [Member]                                
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                                
Share-based Compensation                       $ 279,000   $ 279,000    
Restricted Stock Units (RSUs) [Member]                                
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                                
Stock-based compensation weighted-average vesting period                         1 year 4 months 24 days      
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options     $ 1,200,000               $ 1,200,000   $ 1,200,000      
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                         125,150      
Common Stock, Capital Shares Reserved for Future Issuance     74,850               74,850   74,850      
Employee Stock Option [Member] | Journey Medical Corporation [Member]                                
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                                
Share-based Compensation                     $ 100,000   $ 400,000