Quarterly report pursuant to Section 13 or 15(d)

Inventories - Summary of Inventories, Net (Details)

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Inventories - Summary of Inventories, Net (Details) - USD ($)
Mar. 31, 2021
Dec. 31, 2020
Inventory Disclosure [Abstract]    
Raw materials $ 4,014,408 $ 5,210,327
Sub-assemblies 208,453 255,699
Work-in-process 768,473 407,328
Finished goods 5,218,864 4,424,603
Inventory gross 10,210,198 10,297,957
Less: reserves for obsolete and slow-moving inventories (661,238) (650,453)
Inventory net $ 9,548,960 $ 9,647,504