Annual report pursuant to Section 13 and 15(d)

Related Party Transactions - Schedule of The Effective Date and Annual Management Services agreement Fee (Income) Expense (Detail)

v3.8.0.1
Related Party Transactions - Schedule of The Effective Date and Annual Management Services agreement Fee (Income) Expense (Detail)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
USD ($)
Related Party Transaction [Line Items]  
Annual Management Services Agreement Fee Income expense $ 0
Helocyte Inc [Member]  
Related Party Transaction [Line Items]  
Annual Management Services Agreement Fee Income expense $ 500
Annual Consulting Fee Payable Effective Date Mar. 20, 2015
Avenue Therapeutics, Inc. [Member]  
Related Party Transaction [Line Items]  
Annual Management Services Agreement Fee Income expense $ 500
Annual Consulting Fee Payable Effective Date Feb. 17, 2015
Mustang Bio, Inc [Member]  
Related Party Transaction [Line Items]  
Annual Management Services Agreement Fee Income expense $ 500
Annual Consulting Fee Payable Effective Date Mar. 13, 2015
Checkpoint Therapeutics, Inc [Member]  
Related Party Transaction [Line Items]  
Annual Management Services Agreement Fee Income expense $ 500
Annual Consulting Fee Payable Effective Date Mar. 17, 2015
Cellvation Inc [Member]  
Related Party Transaction [Line Items]  
Annual Management Services Agreement Fee Income expense $ 500
Annual Consulting Fee Payable Effective Date Oct. 31, 2016
Caelum Bio sciences Inc [Member]  
Related Party Transaction [Line Items]  
Annual Management Services Agreement Fee Income expense $ 500
Annual Consulting Fee Payable Effective Date Jan. 01, 2017
Cyprium Bio sciences Inc [Member]  
Related Party Transaction [Line Items]  
Annual Management Services Agreement Fee Income expense $ 500
Annual Consulting Fee Payable Effective Date Mar. 13, 2017
Aevitas Inc [Member]  
Related Party Transaction [Line Items]  
Annual Management Services Agreement Fee Income expense $ 500
Annual Consulting Fee Payable Effective Date Jul. 28, 2017
Tamid Bio sciences Inc [Member]  
Related Party Transaction [Line Items]  
Annual Management Services Agreement Fee Income expense $ 500 [1]
Annual Consulting Fee Payable Effective Date Nov. 30, 2017
Fortress Biotech Inc [Member]  
Related Party Transaction [Line Items]  
Annual Management Services Agreement Fee Income expense $ (4,500)
Research and Development Expense [Member]  
Related Party Transaction [Line Items]  
Annual Management Services Agreement Fee Income expense 0
Research and Development Expense [Member] | Helocyte Inc [Member]  
Related Party Transaction [Line Items]  
Annual Management Services Agreement Fee Income expense 250
Research and Development Expense [Member] | Avenue Therapeutics, Inc. [Member]  
Related Party Transaction [Line Items]  
Annual Management Services Agreement Fee Income expense 250
Research and Development Expense [Member] | Mustang Bio, Inc [Member]  
Related Party Transaction [Line Items]  
Annual Management Services Agreement Fee Income expense 250
Research and Development Expense [Member] | Checkpoint Therapeutics, Inc [Member]  
Related Party Transaction [Line Items]  
Annual Management Services Agreement Fee Income expense 250
Research and Development Expense [Member] | Cellvation Inc [Member]  
Related Party Transaction [Line Items]  
Annual Management Services Agreement Fee Income expense 250
Research and Development Expense [Member] | Caelum Bio sciences Inc [Member]  
Related Party Transaction [Line Items]  
Annual Management Services Agreement Fee Income expense 250
Research and Development Expense [Member] | Cyprium Bio sciences Inc [Member]  
Related Party Transaction [Line Items]  
Annual Management Services Agreement Fee Income expense 250
Research and Development Expense [Member] | Aevitas Inc [Member]  
Related Party Transaction [Line Items]  
Annual Management Services Agreement Fee Income expense 250
Research and Development Expense [Member] | Tamid Bio sciences Inc [Member]  
Related Party Transaction [Line Items]  
Annual Management Services Agreement Fee Income expense 250 [1]
Research and Development Expense [Member] | Fortress Biotech Inc [Member]  
Related Party Transaction [Line Items]  
Annual Management Services Agreement Fee Income expense (2,250)
Selling, General and Administrative Expenses [Member]  
Related Party Transaction [Line Items]  
Annual Management Services Agreement Fee Income expense 0
Selling, General and Administrative Expenses [Member] | Helocyte Inc [Member]  
Related Party Transaction [Line Items]  
Annual Management Services Agreement Fee Income expense 250
Selling, General and Administrative Expenses [Member] | Avenue Therapeutics, Inc. [Member]  
Related Party Transaction [Line Items]  
Annual Management Services Agreement Fee Income expense 250
Selling, General and Administrative Expenses [Member] | Mustang Bio, Inc [Member]  
Related Party Transaction [Line Items]  
Annual Management Services Agreement Fee Income expense 250
Selling, General and Administrative Expenses [Member] | Checkpoint Therapeutics, Inc [Member]  
Related Party Transaction [Line Items]  
Annual Management Services Agreement Fee Income expense 250
Selling, General and Administrative Expenses [Member] | Cellvation Inc [Member]  
Related Party Transaction [Line Items]  
Annual Management Services Agreement Fee Income expense 250
Selling, General and Administrative Expenses [Member] | Caelum Bio sciences Inc [Member]  
Related Party Transaction [Line Items]  
Annual Management Services Agreement Fee Income expense 250
Selling, General and Administrative Expenses [Member] | Cyprium Bio sciences Inc [Member]  
Related Party Transaction [Line Items]  
Annual Management Services Agreement Fee Income expense 250
Selling, General and Administrative Expenses [Member] | Aevitas Inc [Member]  
Related Party Transaction [Line Items]  
Annual Management Services Agreement Fee Income expense 250
Selling, General and Administrative Expenses [Member] | Tamid Bio sciences Inc [Member]  
Related Party Transaction [Line Items]  
Annual Management Services Agreement Fee Income expense 250 [1]
Selling, General and Administrative Expenses [Member] | Fortress Biotech Inc [Member]  
Related Party Transaction [Line Items]  
Annual Management Services Agreement Fee Income expense $ (2,250)
[1] Represents the Trigger Date