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Description of Business and Summary of Significant Accounting Policies - Reconciliation of Cash and Cash Equivalents (Details) - USD ($)
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]      
Cash and cash equivalents $ 2,695,177 $ 4,800,554 $ 4,120,738
Merchant reserves 12,645,803 14,977,468 15,803,641
Total $ 15,340,980 $ 19,778,022 $ 19,924,379