PROPERTY AND EQUIPMENT, NET - Schedule of Property, Plant and Equipment (Details) - USD ($)	Mar. 31, 2020	Dec. 31, 2019
Property, Plant and Equipment [Line Items]
Property, plant and equipment	$ 7,991,284	$ 7,277,207
Accumulated depreciation	3,447,099	3,262,554
Property and equipment, net	4,544,185	4,014,653
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property, plant and equipment	1,231,283	1,168,894
Computer equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment	1,189,248	1,151,295
Vehicles
Property, Plant and Equipment [Line Items]
Property, plant and equipment	712,708	683,213
Equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment	1,685,744	1,648,656
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment	1,811,082	1,479,594
Plotters
Property, Plant and Equipment [Line Items]
Property, plant and equipment	952,167	839,455
Construction in Progress
Property, Plant and Equipment [Line Items]
Property, plant and equipment	$ 409,052	$ 306,100