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Related Party Transactions - Additional Information (Detail) - USD ($)
shares in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Related Party Transactions      
Related Party Transaction [Line Items]      
Legal fees and expenses $ 3.2 $ 3.1 $ 2.4
Legal fees and reimbursable expense, payable $ 1.6 1.6  
Nantworks      
Related Party Transaction [Line Items]      
Percentage of ownership interest in joint venture 16.20%    
Shares underlying out of money warrants 1.5    
Preferred return earned $ 0.0 0.7 0.8
Rent expense including common area maintenance and parking 0.0 0.1 $ 1.3
Related party, receivable 0.6 $ 0.6  
Renewal fee payable 1.2    
Renewal fee paid 0.8    
Renewal fee payable on or before each of August 1, 2016 0.2    
Renewal fee payable in 2017 $ 0.2