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Subsequent Events - Additional Information (Detail) - USD ($) |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Aug. 06, 2018 | Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Subsequent Event [Line Items] |  |  |  |  |
Upfront payment |  | $ 3,562,000 | $ 2,224,000 | $ 5,715,000 | $ 4,487,000
Subsequent Event | License | Neuren | North America |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Upfront payment | $ 10,000,000 |  |  |  |
Subsequent Event | License | Neuren | Maximum | North America |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Milestone payments payable | $ 455,000,000 |  |  |  |

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- Definition The aggregate costs related to goods produced and sold and services rendered by an entity during the reporting period. This excludes costs incurred during the reporting period related to financial services rendered and other revenue generating activities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.2(a),(d)) -URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227 + Details
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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
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