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Revenue Recognition (Details 1) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2019
Deferred revenue:    
Unearned revenue, beginning balance $ 1,274,032 $ 654,872
Unearned billings 515,138 1,753,172
Revenue recognized (646,012) (1,264,886)
Unearned revenue, ending balance $ 1,143,158 $ 1,143,158