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Operating Leases - Summary of Total Lease and Operating Expenses (Detail) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Leases [Abstract]        
Lease and operating expenses $ 234,333 $ 226,948 $ 462,797 $ 453,037