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Summary of Significant Accounting Policies - Activities in allowance for doubtful accounts (Details) - USD ($)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Accounting Policies [Abstract]    
Balance at Beginning of Year $ 89,058 $ 89,058
Charged to Costs and Expenses
Amounts Written Off
Balance at End of Year $ 89,058 $ 89,058