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Related Party Transactions - Additional Information (Detail) - USD ($)
shares in Millions
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Related Party Transactions      
Related Party Transaction [Line Items]      
Legal fees and expenses $ 3,100,000 $ 2,400,000 $ 3,000,000
Legal fees and reimbursable expense, payable $ 1,600,000 600,000  
Nantworks      
Related Party Transaction [Line Items]      
Percentage of ownership interest in joint venture 25.20%    
Shares underlying out of money warrants 1.5    
Preferred return earned $ 718,767 821,939 188,000
Rent expense including common area maintenance and parking 100,000 1,300,000 $ 800,000
Related party, receivable 600,000 $ 600,000  
Renewal fee payable 1,200,000    
Renewal fee paid 800,000    
Renewal fee payable on or before each of August 1, 2016 200,000    
Renewal fee payable in 2017 $ 200,000