Inventories (Details) - USD ($)	Mar. 31, 2019	Dec. 31, 2018
Components of inventories
Raw materials	$ 1,030,504	$ 1,207,334
Work-in-process	774,260	872,376
Finished goods	5,676,673	5,547,301
Inventory, gross	7,481,437	7,627,011
Less: inventory reserve	(4,929,768)	(1,212,706)
Inventory, net	$ 2,551,669	$ 6,414,305

Amount before valuation and LIFO reserves of completed merchandise or goods expected to be sold within one year or operating cycle, if longer.

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Gross amount, as of the balance sheet date, of merchandise, goods, commodities, or supplies held for future sale or to be used in manufacturing, servicing or production process.

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Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer.

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Amount before valuation and LIFO reserves of raw materials expected to be sold, or consumed within one year or operating cycle, if longer.

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Amount before valuation and LIFO reserves of merchandise or goods in the production process expected to be completed within one year or operating cycle, if longer.

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