Other Long-Term Liabilities (Details) (USD $)	Jun. 30, 2013	Dec. 31, 2012
Other Long Term Liabilities
Deferral of Arkansas grant, less current portion	$ 547,516	$ 0
Reserve for uncertain tax positions	506,453	506,453
Deferred rent	137,781	345,814
Capital leases – less current portion	33,761	47,372
Long-term deposits	32,738	32,738
Total	$ 1,258,249	$ 932,377

Carrying amount as of the balance sheet date of the unpaid sum of the known and estimated amounts payable to satisfy all domestic and foreign income tax obligations due beyond one year or the operating cycle, whichever is longer. Alternate captions include income taxes payable, noncurrent.

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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 and due to be paid more than one year (or one operating cycle, if longer) after the balance sheet date.

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- Definition

For a classified balance sheet, the cumulative difference between the rental income or payments required by a lease agreement and the rental income or expense recognized on a straight-line basis, or other systematic and rational basis more representative of the time pattern in which use or benefit is granted or derived from the leased property, expected to be recognized in income or expense, by the lessor or lessee, respectively, more than one year after the balance sheet date.

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