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Fair Value of Financial Instruments - Additional Information (Detail) - USD ($) | Sep. 30, 2015 | Dec. 31, 2014
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Fair Value Disclosures [Abstract] |  |
Liabilities measured at fair value on recurring basis | $ 0 | $ 0

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
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- Definition Aggregation of the liabilities reported on the balance sheet measured at fair value on a recurring basis by the entity. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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