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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% |  |  |  |  |  |

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