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Employee Benefit Plan - Details of Company Contribution to Plan (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Defined Contribution Pension and Other Postretirement Plans Disclosure [Abstract] |  |  |
Company contribution to 401 (k) plan | $ 106 us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount | $ 91 us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount | $ 77 us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount

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- Details
Name: | us-gaap_DefinedContributionPensionAndOtherPostretirementPlansDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of discretionary contributions made by an employer to a defined contribution plan. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration