Commitments and Contingencies (Additional Information) (Detail) (USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Commitments and Contingencies Disclosure [Line Items]
Rent expenses	$ 67,533	$ 92,852
Factory Building [Member]
Commitments and Contingencies Disclosure [Line Items]
Non-cancelable operating lease expiration period	Apr. 30, 2014
Office Building [Member]
Commitments and Contingencies Disclosure [Line Items]
Non-cancelable operating lease expiration period	Mar. 31, 2013
Land [Member]
Commitments and Contingencies Disclosure [Line Items]
Non-cancelable operating lease expiration period	Aug. 31, 2059
Annual rental payment	53,115
Debt Guaranteed To Third Party By Company [Member]
Commitments and Contingencies Disclosure [Line Items]
Debt guaranteed amount	26,490,000
Amount of total guaranteed outstanding borrowings	22,181,000
Debt Guaranteed By Third Party [Member]
Commitments and Contingencies Disclosure [Line Items]
Debt guaranteed amount	27,607,000
Amount of total guaranteed outstanding borrowings	$ 16,755,000