Quarterly report pursuant to Section 13 or 15(d)

Non-Controlling Interests - Summary Of Components of Non-Controlling Interests in Loss of Consolidated Entities (Detail)

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Non-Controlling Interests - Summary Of Components of Non-Controlling Interests in Loss of Consolidated Entities (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Noncontrolling Interest [Line Items]        
Non-controlling interests in loss of consolidated entities $ (243) $ 0 $ (722) $ 0
Avenue [Member]        
Noncontrolling Interest [Line Items]        
Non-controlling interests in loss of consolidated entities     $ (34)  
Non-controlling ownership (See Note 4) 11.50%   11.50%  
Coronado SO Co, Inc [Member]        
Noncontrolling Interest [Line Items]        
Non-controlling interests in loss of consolidated entities     $ (230)  
Non-controlling ownership (See Note 4) 13.00%   13.00%  
Mustang Therapeutics, Inc [Member]        
Noncontrolling Interest [Line Items]        
Non-controlling interests in loss of consolidated entities     $ (267)  
Non-controlling ownership (See Note 4) 10.00%   10.00%  
Checkpoint Therapeutics, Inc [Member]        
Noncontrolling Interest [Line Items]        
Non-controlling interests in loss of consolidated entities     $ (191)  
Non-controlling ownership (See Note 4) 20.00%   20.00%