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Fair Value Measurement - Summary of Quantitative Information of Level 3 Measurements (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Derivative liability	$ 11us-gaap_DerivativeLiabilitiesCurrent
Fair Value, Inputs, Level 3 [Member]
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Derivative liability	$ 11
Derivative liability	Black-Scholes option pricing model

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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