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Income Taxes - Income Tax Expenses for Continuing Operations (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Income Tax Expense Benefit From Continuing Operations [Line Items]
Loss before tax	$ (3,574)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	$ (3,968)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Income tax benefit	(41)us-gaap_IncomeTaxExpenseBenefit	(33)us-gaap_IncomeTaxExpenseBenefit
Peoples' Republic of China [Member]
Income Tax Expense Benefit From Continuing Operations [Line Items]
Loss before tax	(3,574)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / us-gaap_StatementGeographicalAxis = country_CN	(3,968)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / us-gaap_StatementGeographicalAxis = country_CN
Applicable tax rate	25.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations / us-gaap_StatementGeographicalAxis = country_CN	25.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations / us-gaap_StatementGeographicalAxis = country_CN
Computed expected tax benefit	(894)us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate / us-gaap_StatementGeographicalAxis = country_CN	(992)us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate / us-gaap_StatementGeographicalAxis = country_CN
Effect on other entities not subject to income tax	653us-gaap_IncomeTaxReconciliationOtherAdjustments / us-gaap_StatementGeographicalAxis = country_CN	959us-gaap_IncomeTaxReconciliationOtherAdjustments / us-gaap_StatementGeographicalAxis = country_CN
Effect on non-deductible cost	203us-gaap_IncomeTaxReconciliationNondeductibleExpense / us-gaap_StatementGeographicalAxis = country_CN	2us-gaap_IncomeTaxReconciliationNondeductibleExpense / us-gaap_StatementGeographicalAxis = country_CN
HK [Member]
Income Tax Expense Benefit From Continuing Operations [Line Items]
Applicable tax rate	16.50%us-gaap_EffectiveIncomeTaxRateContinuingOperations / us-gaap_StatementGeographicalAxis = country_HK
Effect on HK entities subject to income tax 16.5%	$ (3)us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential / us-gaap_StatementGeographicalAxis = country_HK	$ (2)us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential / us-gaap_StatementGeographicalAxis = country_HK

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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This element represents the income or loss from continuing operations attributable to the economic entity which may also be defined as revenue less expenses from ongoing operations, after income or loss from equity method investments, but before income taxes, extraordinary items, and noncontrolling interest.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to foreign income tax expense (benefit).

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The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to nondeductible expenses.

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