Property and Equipment (Details) - USD ($)	6 Months Ended
Jun. 30, 2019	Dec. 31, 2018
Components of property and equipment
Property and equipment, gross	$ 16,557,345	$ 46,927,112
Less: accumulated depreciation	(9,674,689)	(25,363,692)
Property and equipment, net	$ 6,882,656	21,563,420
Office equipment and furniture [Member]
Components of property and equipment
Property and equipment, useful life	5 years
Property and equipment, gross	$ 88,503	86,724
Manufacturing equipment [Member]
Components of property and equipment
Property and equipment, gross	$ 11,257,906	20,297,029
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	$ 177,071	176,884
Building and building improvements [Member]
Components of property and equipment
Property and equipment, gross		21,341,612
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	$ 3,387,954	338,190
Construction in progress [Member]
Components of property and equipment
Property and equipment, gross	$ 1,645,911	$ 4,686,673

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.

+ References

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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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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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.

+ References

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