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Commitments and Contingencies - Additional Information (Detail) $ in Millions | Jun. 30, 2018 USD ($)
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Commitments and Contingencies Disclosure [Abstract] |
Loss contingency accrual | $ 0.2

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- Definition Amount of loss contingency liability. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14326-108349 + Details
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