Annual report pursuant to Section 13 and 15(d)

Related Party Transactions - Schedule of dividend or equity fee recorded by the Company (Detail)

v3.8.0.1
Related Party Transactions - Schedule of dividend or equity fee recorded by the Company (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dividends Payable, Current $ 0 [1] $ 0
Aevitas [Member]    
Dividends Payable Date Of Record Description [2] July 28  
Dividends Payable, Current [2] $ 0 [1] 0
Avenue [Member]    
Dividends Payable Date Of Record Description February 17  
Dividends Payable, Current $ 1,103 [1] 49
Caelum [Member]    
Dividends Payable Date Of Record Description January 1  
Dividends Payable, Current $ 302 [1] 0
Cellvation [Member]    
Dividends Payable Date Of Record Description October 31  
Dividends Payable, Current $ 8 [1] 0
Checkpoint [Member]    
Dividends Payable Date Of Record Description March 17  
Dividends Payable, Current $ 2,296 [1] 3,919
Cyprium [Member]    
Dividends Payable Date Of Record Description January 1  
Dividends Payable, Current $ 1 [1] 0
Helocyte [Member]    
Dividends Payable Date Of Record Description March 20  
Dividends Payable, Current $ 321 [1] 0
Mustang [Member]    
Dividends Payable Date Of Record Description March 13  
Dividends Payable, Current $ 9,479 [1] 4,396
Tamid [Member]    
Dividends Payable Date Of Record Description [3] November 30  
Dividends Payable, Current [3] $ 0 [1] 0
Fortress [Member]    
Dividends Payable, Current $ (13,510) [1] $ (8,364)
[1] Includes 2018 PIK dividend accrued for the year ended December 31, 2017, as Type 1 subsequent event.
[2] Aevitas PIK dividend wll be recorded during the third quarter of 2018
[3] Tamid PIK dividend will be recorded during the fourth quarter of 2018