PROPERTY AND EQUIPMENT, NET - Schedule of Property, Plant and Equipment (Details) - USD ($)	Sep. 30, 2020	Dec. 31, 2019
Property, Plant and Equipment [Line Items]
Property, plant and equipment	$ 8,637,043	$ 7,277,207
Less: accumulated depreciation	4,045,256	3,262,554
Property and equipment, net	4,591,787	4,014,653
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property, plant and equipment	1,304,112	1,168,894
Computer equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment	1,362,805	1,151,295
Vehicles
Property, Plant and Equipment [Line Items]
Property, plant and equipment	709,905	683,213
Equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment	1,870,191	1,648,656
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment	1,913,398	1,479,594
Plotters
Property, Plant and Equipment [Line Items]
Property, plant and equipment	1,131,936	839,455
Construction in Progress
Property, Plant and Equipment [Line Items]
Property, plant and equipment	$ 344,696	$ 306,100