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Accounts Payable - Summary of Accounts Payable (Detail) - USD ($)
Dec. 31, 2015
Dec. 31, 2014
Accounts Payable [Abstract]    
External services $ 1,995,302 $ 1,352,710
Supplies 476,544 339,762
Other 40,199 126,359
Total accounts payable $ 2,512,045 $ 1,818,831