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Summary of Significant Accounting Policies (Detail) | 1 Months Ended | 12 Months Ended | 24 Months Ended | 27 Months Ended
--- | --- | --- | --- | ---
Aug. 31, 2015 USD ($) | Dec. 31, 2017 USD ($) segment item | Dec. 31, 2016 USD ($) item | Dec. 31, 2017 USD ($) item | Dec. 31, 2013
Fair Value Measurements |  |  |  |  |
Number Of Operating Segments | segment |  | 1 |  |  |
Assets measured at fair value levels 2 or 3 |  | $ 0 | $ 0 | $ 0 |
Liabilities measured at fair value levels 2 or 3 |  | 0 | 0 | 0 |
Carrying value of cash held in money market fund |  | $ 121,900,000 | $ 38,000,000 | 121,900,000 |
Impairment of Long-Lived Assets |  |  |  |  |
Number of long-lived assets determined to be impaired | item |  | 0 | 0 |  |
Assets held for sale |  | $ 0 | $ 0 | $ 0 |
Maximum |  |  |  |  |
Share-based Compensation |  |  |  |  |
Expected term |  | 10 years |  |  |
Pfizer | License Agreement |  |  |  |  |
Revenue Recognition |  |  |  |  |
Milestone revenue | $ 20,000,000 | $ 0 | $ 0 |  |
Number of milestones met | item |  |  |  | 0 |
Pfizer | License Agreement | Up-Front Payment Arrangement |  |  |  |  |
Revenue Recognition |  |  |  |  |
Recognition period of up-front payment |  |  |  |  | 1 year 6 months

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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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