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Commitments and Contingencies - Rental Obligations (Detail)
$ in Millions
3 Months Ended
Mar. 31, 2016
USD ($)
Sep. 30, 2015
USD ($)
Mar. 31, 2015
USD ($)
Feb. 01, 2016
ft²
Oct. 01, 2014
ft²
Payments for (Proceeds from) Tenant Allowance   $ (1.8)      
Potential Rental Rate Adjustment Minimum 2.50%        
Potential Rental Rate Adjustment Maximum 4.00%        
Operating Leases, Rent Expense, Net $ 1.9   $ 1.3    
Operating Leases, Future Minimum Payments Due, Remainder of 2016 4.3        
Operating Leases, Future Minimum Payments, 2017 6.5        
Operating Leases, Future Minimum Payments, 2018 8.1        
Operating Leases, Future Minimum Payments, 2019 9.0        
Operating Leases, Future Minimum Payments, 2020 9.5        
Operating Leases, Future Minimum Payments, Thereafter 12.3        
Total $ 49.7        
Leased Buildings -6340 Sequence Drive and 6310 Sequence Drive [Member]          
Leased Square Footage | ft²         219,000
Leased Buildings -6350 Sequence Drive [Member]          
Leased Square Footage | ft²       132,600  
6310,6340 and 6290 Sequence Drive Lease [Member]          
Lessee Leasing Arrangements, Operating Leases, Number of Renewal Term 2        
Lessee Leasing Arrangements, Operating Leases, Renewal Term 5 years