Quarterly report pursuant to Section 13 or 15(d)

Inventories (Details)

v3.19.3
Inventories (Details) - USD ($)
Sep. 30, 2019
Dec. 31, 2018
Inventory Disclosure [Abstract]    
Raw materials $ 52,468,342 $ 59,778,767
Work-in-process 16,535,978 21,033,532
Finished goods 37,199,863 33,389,087
Total inventories $ 106,204,183 $ 114,201,386