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Operating Leases - Summary of Total Lease and Operating Expenses (Detail) (USD $)
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Leases [Abstract]        
Lease and operating expenses $ 177,310 $ 174,278 $ 517,549 $ 512,529