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Inventories (Details) - USD ($)
Jun. 30, 2018
Dec. 31, 2017
Inventory Disclosure [Abstract]    
Raw materials $ 46,202,040 $ 37,748,316
Work-in-process 16,477,860 9,491,408
Finished goods 27,891,241 24,885,457
Total inventories $ 90,571,141 $ 72,125,181