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Inventories - Summary of Inventories, Net (Details) - USD ($)
Sep. 30, 2020
Dec. 31, 2019
Inventory Disclosure [Abstract]    
Raw materials $ 5,532,507 $ 2,478,882
Sub-assemblies 197,524 1,857,004
Work-in-process 556,889 493,276
Finished goods 4,434,945 3,087,529
Inventory gross 10,721,865 7,916,691
Less: reserves for obsolete and slow-moving inventories (722,185) (547,335)
Inventory net $ 9,999,680 $ 7,369,356