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Short-term Borrowings - Summary of short-term borrowings (Detail) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Short-Term Debt [Abstract]      
Notes payable - U.S. Treasury       $ 254,749us-gaap_NotesPayable
Short-term borrowings       $ 254,749us-gaap_ShortTermBorrowings