SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Customer concentrations (Details)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Revenues [Member]
Concentration Risk, Percentage	100.00%	100.00%	100.00%	100.00%
Accounts Receivable [Member]
Concentration Risk, Percentage			100.00%		100.00%
Accounts Payable [Member]
Concentration Risk, Percentage			100.00%		100.00%
Customer A [Member] | Revenues [Member]
Concentration Risk, Percentage		67.00%		46.00%
Customer B [Member] | Revenues [Member]
Concentration Risk, Percentage		14.00%		10.00%
Customer B [Member] | Accounts Receivable [Member]
Concentration Risk, Percentage			23.00%
Customer C [Member] | Accounts Receivable [Member]
Concentration Risk, Percentage					33.00%
Customer D [Member] | Accounts Receivable [Member]
Concentration Risk, Percentage					17.00%
Customer E [Member] | Accounts Receivable [Member]
Concentration Risk, Percentage					20.00%
Customer F [Member] | Accounts Receivable [Member]
Concentration Risk, Percentage					19.00%
Customer G [Member] | Revenues [Member]
Concentration Risk, Percentage	35.00%		44.00%
Customer H [Member] | Revenues [Member]
Concentration Risk, Percentage				15.00%
Customer I [Member] | Revenues [Member]
Concentration Risk, Percentage	26.00%
Customer I [Member] | Accounts Receivable [Member]
Concentration Risk, Percentage			56.00%
Customer J [Member] | Revenues [Member]
Concentration Risk, Percentage			12.00%
Customer K [Member] | Revenues [Member]
Concentration Risk, Percentage	12.00%
Customer K [Member] | Accounts Receivable [Member]
Concentration Risk, Percentage			10.00%
All other customers [Member] | Revenues [Member]
Concentration Risk, Percentage	27.00%	19.00%	44.00%	29.00%
All other customers [Member] | Accounts Receivable [Member]
Concentration Risk, Percentage			11.00%		11.00%
Vendor A [Member] | Accounts Payable [Member]
Concentration Risk, Percentage					15.00%
Vendor B [Member] | Accounts Payable [Member]
Concentration Risk, Percentage					16.00%
Vendor C [Member] | Accounts Payable [Member]
Concentration Risk, Percentage					17.00%
Vendor D [Member] | Accounts Payable [Member]
Concentration Risk, Percentage					12.00%
Vendor E [Member] | Accounts Payable [Member]
Concentration Risk, Percentage			47.00%
Vendor F [Member] | Accounts Payable [Member]
Concentration Risk, Percentage			10.00%
All other vendors [Member] | Accounts Payable [Member]
Concentration Risk, Percentage			43.00%		40.00%