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Operating Leases - Summary of Total Lease and Operating Expenses (Detail) (USD $)
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Leases [Abstract]        
Lease and operating expenses $ 164,351 $ 167,872 $ 340,239 $ 338,251