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Commitments and Contingencies - Rental Obligations (Detail)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2018
USD ($)
renewal_term
Sep. 30, 2017
USD ($)
Dec. 31, 2017
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 $ 241.9   241.9   $ 200.4        
Financing lease obligation 7.3   7.3   6.7        
Operating leases, rent expense 2.9 $ 2.7 8.6 $ 8.3          
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]                  
Remainder of 2018 2.6   2.6            
2019 13.8   13.8            
2020 14.7   14.7            
2021 15.1   15.1            
2022 4.2   4.2            
Thereafter 9.4   9.4            
Total 59.8   59.8            
Building                  
Property, plant and equipment, gross $ 6.0   $ 6.0   $ 6.0        
Property, Plant and Equipment | Building                  
Property, plant and equipment, gross           $ 6.0      
Leased Buildings -6340 Sequence Drive, 6310 Sequence Drive, 6290 Sequence drive                  
Lessee leasing arrangements, operating leases, number of renewal terms | renewal_term     2            
Lessee, operating lease, renewal term     5 years            
Leased Buildings -232 South Dobson Road                  
Lessee leasing arrangements, operating leases, number of renewal terms | renewal_term     4            
Lessee, operating lease, 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      
Minimum                  
Annual rent potential rate adjustment     2.50%            
Maximum                  
Annual rent potential rate adjustment     4.00%