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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

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