Annual report pursuant to Section 13 and 15(d)

Stockholders' Equity - share based compensation activity (Detail)

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Stockholders' Equity - share based compensation activity (Detail)
Dec. 31, 2017
shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Shares Authorized 12,506,679
Avenue Therapeutics, Inc. 2015 Stock Plan [Member] | Avenue [Member]  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Shares Authorized 2,000,000
Shares available 1,115,000
Caelum Biosciences Inc. 2017 Incentive Plan [Member] | Caelum [Member]  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Shares Authorized 2,000,000
Shares available 125,002
Cellvation Inc. 2016 Incentive Plan [Member] | Cellvation [Member]  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Shares Authorized 2,000,000
Shares available 300,000
Checkpoint Therapeutics, Inc. Amended and Restated 2015 Stock Plan [Member] | Checkpoint [Member]  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Shares Authorized 5,000,000
Shares available 2,961,697
Cyprium Therapeutics, Inc. 2017 Stock Plan [Member] | Cyprium [Member]  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Shares Authorized 2,000,000
Shares available 2,000,000
DiaVax Biosciences, Inc. 2015 Incentive Plan [Member] | Helocyte [Member]  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Shares Authorized 2,000,000
Shares available 341,667
Journey Medical Corporation 2015 Stock Plan [Member] | Journey [Member]  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Shares Authorized 3,000,000
Shares available 614,792
Mustang Bio, Inc. 2016 Incentive Plan [Member] | Mustang [Member]  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Shares Authorized 2,000,000
Shares available 444,325
FBIO Acquisition Corp. V 2017 Incentive Plan [Member] | Tamid [Member]  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Shares Authorized 2,000,000
Shares available 1,600,000