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Commitments and Contingencies - Additional Information (Detail) ft² in Thousands, $ in Millions | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2007 USD ($) Building | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) ft² RenewalOptions Lease_Agreements | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2008 USD ($)
Commitment And Contingencies [Line Items] |  |  |  |  |  |
Sale of facility and associated real property | $ 109.0 |  |  |  |  |
Mortgage debt retired | 47.7 |  |  |  |  |
Cash received net of transaction costs and debt retirement | $ 61.0 |  |  |  |  |
Leaseback transaction lease period | 12 years |  |  |  |  |
Number of building leased | Building | 2 |  |  |  |  |
Net deferred gain on real estate sale |  |  | $ 8.8 |  |  | $ 39.1
Deferred gain recognized on real estate sale |  |  | $ 2.1 | $ 3.4 | $ 3.3 |
Lease expiration year |  |  | 2029 |  |  |
Percentage of management fee included in the base annual rent |  |  | 3.50% |  |  |
Letter of credit |  |  | $ 3.0 |  |  |
Lease extension period |  |  | 10 years |  |  |
Number of times to renew the lease contract | RenewalOptions |  |  | 2 |  |  |
Lease security deposit |  |  | $ 4.7 |  |  |
Subleased area | ft² |  |  | 16 |  |  |
Rent expense |  |  | $ 5.9 | 6.0 | $ 6.0 |
Lease expiration year |  |  | 2029 |  |  |
Milestone payables |  |  | $ 132.0 |  |  |
Minimum |  |  |  |  |  |
Commitment And Contingencies [Line Items] |  |  |  |  |  |
Lease cancellation, notice period |  |  | 0 days |  |  |
Maximum |  |  |  |  |  |
Commitment And Contingencies [Line Items] |  |  |  |  |  |
Lease cancellation, notice period |  |  | 180 days |  |  |
Royalty, rate |  |  | 5.00% |  |  |
Scenario, Forecast |  |  |  |  |  |
Commitment And Contingencies [Line Items] |  |  |  |  |  |
Rental income from sublease agreement |  | $ 0.1 |  |  |  |
Sublease |  |  |  |  |  |
Commitment And Contingencies [Line Items] |  |  |  |  |  |
Number of sublease agreements | Lease_Agreements |  |  | 1 |  |  |
Reversal of cease use expense |  |  | $ 0.5 | $ 0.8 |  |
Second Sublease |  |  |  |  |  |
Commitment And Contingencies [Line Items] |  |  |  |  |  |
Lease expiration date |  |  | 2018-03 |  |  |
Amended Lease Term |  |  |  |  |  |
Commitment And Contingencies [Line Items] |  |  |  |  |  |
Lease expiration date |  |  | Dec. 31, 2029 |  |  |
Percentage reduction in base rental |  |  | 8.00% |  |  |
Tenant improvement allowances |  |  | $ 13.1 |  |  |
Lease security deposit |  |  | $ 3.0 |  |  |

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- Definition Amount of expense (reversal of expense) in connection with exit or disposal activity (including executory costs such as maintenance charges) net of estimated income from potential subleasing. + References No definition available. + Details
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