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Revenue (Details Textual) | 3 Months Ended | 12 Months Ended
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Mar. 31, 2018 | Dec. 31, 2018
Revenue (Textual) |  |
Revenue, description | We had a backlog of orders (representing purchase orders received from customers which were not fulfilled or paid) worth approximately $1,245,000. | We had received orders representing a backlog worth approximately $393,000.

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- Definition Description of the transaction or nature of business giving rise to deferred revenue or unearned revenue, other than annual membership fees. Deferred revenue is a liability related to a revenue producing activity for which revenue has not yet been recognized. Generally, an entity records deferred revenue when it receives consideration from a customer before achieving certain criteria that must be met for revenue to be recognized in conformity with GAAP. + References Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 8 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82887183&loc=d3e6935-107765 + Details
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