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Fair Value Measurement - Fair Value of Derivative Liability (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014
Schedule of Fair Value Measurement Details Fair Value Of Derivative Liability [Line Items]
Included in other current liabilities: Derivative liability	$ 11us-gaap_DerivativeLiabilitiesCurrent
Fair Value, Inputs, Level 3 [Member]
Schedule of Fair Value Measurement Details Fair Value Of Derivative Liability [Line Items]
Included in other current liabilities: Derivative liability	$ 11

Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, expected to be settled within one year or normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset.

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