SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES, Customer Concentration (Details)	3 Months Ended
	Mar. 31, 2021 USD ($) Customer	Mar. 31, 2020 USD ($)	Dec. 31, 2020 USD ($)
Customer Concentration [Abstract]
Amount of revenues from single customer	$ 1,620,609	$ 66,667
Contract assets	426,954		$ 196,701
Customer One [Member]
Customer Concentration [Abstract]
Contract assets	$ 125,000
Revenue Benchmark [Member] | Customer Concentration Risk [Member] | Customer One [Member]
Customer Concentration [Abstract]
Number of major customers | Customer	1
Amount of revenues from single customer	$ 237,500
Percentage of revenues generated from customer sales	15.00%