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Commitments and Contingencies - Rental Obligations (Detail)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2017
USD ($)
renewal_term
Sep. 30, 2016
USD ($)
Dec. 31, 2016
USD ($)
May 01, 2016
USD ($)
ft²
Apr. 28, 2016
ft²
Feb. 01, 2016
ft²
Oct. 01, 2014
ft²
Proceeds from tenant improvement allowance     $ (3.6)            
Property, Plant and Equipment, Gross $ 188.4   188.4   $ 156.6        
Financing lease obligation 6.7   6.7   6.7        
Operating Leases, Rent Expense 2.7 $ 2.4 8.3 $ 6.6          
Remainder of 2017 2.2   2.2            
Operating Leases, Future Minimum Payments, 2018 10.1   10.1            
Operating Leases, Future Minimum Payments, 2019 11.0   11.0            
Operating Leases, Future Minimum Payments, 2020 11.4   11.4            
Operating Leases, Future Minimum Payments, 2021 11.7   11.7            
Thereafter 13.1   13.1            
Total 59.5   59.5            
Building (1)                  
Property, Plant and Equipment, Gross $ 6.0   $ 6.0   $ 6.0        
Property, Plant and Equipment | Building (1)                  
Property, Plant and Equipment, Gross           $ 6.0      
Leased Buildings -232 South Dobson Road                  
Lessee Leasing Arrangements, Operating Leases, Number of Renewal Term | renewal_term     4            
Lessee Leasing Arrangements, Operating Leases, Renewal Term     5 years            
Leased Buildings -6340 Sequence Drive, 6310 Sequence Drive, 6290 Sequence drive                  
Lessee Leasing Arrangements, Operating Leases, Number of Renewal Term | renewal_term     2            
Lessee Leasing Arrangements, Operating Leases, Renewal Term     5 years            
Leased Buildings -6340 Sequence Drive, 6310 Sequence Drive, 6290 Sequence drive                  
Leased Square Footage | ft²                 219,000
Leased Buildings -6350 Sequence Drive                  
Leased Square Footage | ft²               132,600  
Leased Buildings -232 South Dobson Road                  
Leased Square Footage | ft²           78,000 148,797    
Leased Buildings -232 South Dobson Road | Other Noncurrent Liabilities                  
Financing lease obligation           $ 6.0      
Maximum                  
Annual rent potential rate adjustment     4.00%            
Minimum                  
Annual rent potential rate adjustment     2.50%