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Financial Instruments - Additional Information (Detail) - USD ($)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2015
Debt Instrument Fair Value Carrying Value [Abstract]    
Long-term debt $ 96,137,758 $ 87,945,826
Percentage of fixed rate of interest carrying amount of notes receivables 2.57%  
Fair value of notes receivable $ 1,700,000  
Notes receivable from related parties $ 1,748,092