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

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- Details

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X

- Definition

Amount of discretionary contributions made by an employer to a defined contribution plan.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
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