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Warranties - Changes in Product Warranty Liability (Detail) (USD $)	3 Months Ended
	Mar. 31, 2013
Movement in Standard Product Warranty Accrual [Roll Forward]
Beginning Balance	$ 364,749
Warranties issued during the period	36,022
Settlements made during the period	(8,889)
Ending Balance	$ 391,882

- Definition

Carrying value as of the balance sheet date of obligations incurred through that date and payable for estimated claims under standard and extended warranty protection rights granted to customers.

+ References+ Details