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Plant and Equipment, net (Additional Information) (Detail) (USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Property, Plant and Equipment [Line Items]
Depreciation and amortization	$ 464,662	$ 383,034
(Gain) loss on sale of plant and equipment	$ (40,888)	$ 4,910

The current period expense charged against earnings on long-lived, physical assets not used in production, and which are not intended for resale, to allocate or recognize the cost of such assets over their useful lives; or to record the reduction in book value of an intangible asset over the benefit period of such asset; or to reflect consumption during the period of an asset that is not used in production.

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