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Subsequent Events - Additional Information (Detail) - Research Facility in Madison - ft² |  | 1 Months Ended |
--- | --- | --- | ---
Jan. 01, 2019 | Jan. 31, 2019 | Dec. 31, 2018
Subsequent Event [Line Items] |  |  |
Additional office space leases, in square feet |  |  | 60,000
Subsequent Event |  |  |
Subsequent Event [Line Items] |  |  |
Additional office space leases, in square feet |  | 13,000 |
Lease extended term |  | through September 2029 |
Initial term of amended lease commencement date | Jan. 01, 2019 |  |

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- Details
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- Details
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