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Revenue Recognition (Details 1) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2019
Deferred revenue:    
Unearned revenue, beginning balance $ 1,143,158 $ 654,872
Unearned billings 434,005 2,187,176
Revenue recognized (625,337) (1,890,222)
Unearned revenue, ending balance $ 951,826 $ 951,826