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Income Taxes - Summary of Income Taxes Expenses (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Deferred tax benefits
Deferred tax benefits	$ (37)us-gaap_DeferredIncomeTaxExpenseBenefit	$ (37)us-gaap_DeferredIncomeTaxExpenseBenefit
Income tax benefit	(41)us-gaap_IncomeTaxExpenseBenefit	(33)us-gaap_IncomeTaxExpenseBenefit
Peoples' Republic of China [Member]
Deferred tax benefits
Deferred tax benefits	(37)	(37)
HK [Member]
Current tax expense
Current tax expense	$ (4)	$ 4

Amount of current income tax expense (benefit) pertaining to taxable income (loss) from continuing operations.

Amount of deferred income tax expense (benefit) pertaining to income (loss) from continuing operations.