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Accrued Expenses and Other Current Liabilities - Summary of Accrued Expenses (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012
Payables And Accruals [Abstract]
External services	$ 1,191,048	$ 900,580
Employee compensation	2,655,242	1,577,322
Other	221,626	229,539
Total accrued expenses and other current liabilities	$ 4,067,916	$ 2,707,441

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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