Property and Equipment (Details) - USD ($)	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017
Components of property and equipment
Property and equipment, gross	$ 46,927,112	$ 62,611,158
Less: accumulated depreciation	(25,363,692)	(29,430,039)
Property and equipment, net	$ 21,563,420	33,181,119
Office equipment and furniture [Member]
Components of property and equipment
Property and equipment, useful life	5 years
Property and equipment, gross	$ 86,724	71,120
Manufacturing equipment [Member]
Components of property and equipment
Property and equipment, gross	$ 20,297,029	34,419,653
Manufacturing equipment [Member] \| Minimum [Member]
Components of property and equipment
Property and equipment, useful life	5 years
Manufacturing equipment [Member] \| Maximum [Member]
Components of property and equipment
Property and equipment, useful life	10 years
Vehicles [Member]
Components of property and equipment
Property and equipment, useful life	5 years
Property and equipment, gross	$ 176,884	253,564
Building and building improvements [Member]
Components of property and equipment
Property and equipment, gross	$ 21,341,612	22,556,026
Building and building improvements [Member] \| Minimum [Member]
Components of property and equipment
Property and equipment, useful life	5 years
Building and building improvements [Member] \| Maximum [Member]
Components of property and equipment
Property and equipment, useful life	20 years
Manufacturing equipment in progress [Member]
Components of property and equipment
Property and equipment, gross	$ 338,190	3,657,936
Construction in progress [Member]
Components of property and equipment
Property and equipment, gross	$ 4,686,673	$ 1,652,859

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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