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Accrued Expenses and Other Current Liabilities (Details) (USD $)	Dec. 31, 2012	Dec. 31, 2011
Accrued expenses
External services	$ 900,580	$ 1,204,137
Employee compensation	1,577,322	1,361,954
Other	229,539	404,160
Total accrued expenses and other current liabilities	$ 2,707,441	$ 2,970,251

Carrying value as of the balance sheet date of obligations incurred through that date and payable arising from transactions not otherwise specified in the taxonomy. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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