Inventories (Details Textual) - USD ($)	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Mar. 31, 2019
Inventory Disclosure [Abstract]
Inventory obsolescence write offs	$ 565,406	$ 6,366
Increase in inventory wasp system production			$ 3,800,000

Amount of loss from reductions in inventory due to subsequent measurement adjustments, including, but not limited to, physical deterioration, obsolescence, or changes in price levels.

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