Annual report pursuant to section 13 and 15(d)

Rent Expense for Operating Leases (Detail)

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Rent Expense for Operating Leases (Detail) (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Schedule of Rent Expense [Line Items]    
Rent expense $ 301,527 $ 479,533
Less sublease rentals (35,416) (141,663)
Total rent expense $ 266,111 $ 337,870