Quarterly report pursuant to Section 13 or 15(d)

Inventories (Details)

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Inventories (Details) - USD ($)
Sep. 30, 2018
Dec. 31, 2017
Inventory Disclosure [Abstract]    
Raw materials $ 65,458,268 $ 37,748,316
Work-in-process 18,262,774 9,491,408
Finished goods 32,308,609 24,885,457
Total inventories $ 116,029,651 $ 72,125,181