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Components of Capital Lease Obligations (Detail) (USD $)	Jun. 30, 2012	Dec. 31, 2011
Capital Leased Assets [Line Items]
Imputed interest rate on capital lease obligations	6.70%
Total capital lease obligations	$ 3,025,078	$ 3,226,300
Less: Current portion	(90,551)	(189,742)
Capital lease obligations, net of current portion	$ 2,934,527	$ 3,036,558

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Interest Rate Used To Capitalize Lease

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Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal through the balance sheet date.

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