Other Income (Expenses) (Detail) (USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Other Income Net [Line Items]
Other income	$ (5,764)	$ 94,779
Government subsidies
Other Income Net [Line Items]
Other income	0	95,128
Other
Other Income Net [Line Items]
Other income	$ (5,764)	$ (349)