CONCENTRATIONS, SIGNIFICANT CUSTOMERS, COMMITMENTS AND CONTINGENCIES - Customer Concentrations (Details)	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Customer concentration risk | Revenues | Customer 1
Revenue, Major Customer
Concentration percentage (as a percent)	22.00%	23.00%
Customer concentration risk | Revenues | Customer 1 | Black Oil
Revenue, Major Customer
Concentration percentage (as a percent)	0.00%	0.00%
Customer concentration risk | Revenues | Customer 1 | Refining
Revenue, Major Customer
Concentration percentage (as a percent)	26.00%	30.00%
Customer concentration risk | Revenues | Customer 1 | Recovery
Revenue, Major Customer
Concentration percentage (as a percent)	0.00%	0.00%
Customer concentration risk | Revenues | Customer 2
Revenue, Major Customer
Concentration percentage (as a percent)	19.00%	15.00%
Customer concentration risk | Revenues | Customer 2 | Black Oil
Revenue, Major Customer
Concentration percentage (as a percent)	0.00%	0.00%
Customer concentration risk | Revenues | Customer 2 | Refining
Revenue, Major Customer
Concentration percentage (as a percent)	22.00%	20.00%
Customer concentration risk | Revenues | Customer 2 | Recovery
Revenue, Major Customer
Concentration percentage (as a percent)	0.00%	0.00%
Customer concentration risk | Revenues | Customer 3
Revenue, Major Customer
Concentration percentage (as a percent)	12.00%	12.00%
Customer concentration risk | Revenues | Customer 3 | Black Oil
Revenue, Major Customer
Concentration percentage (as a percent)	0.00%	0.00%
Customer concentration risk | Revenues | Customer 3 | Refining
Revenue, Major Customer
Concentration percentage (as a percent)	13.00%	15.00%
Customer concentration risk | Revenues | Customer 3 | Recovery
Revenue, Major Customer
Concentration percentage (as a percent)	0.00%	0.00%
Customer concentration risk | Receivables | Customer 1
Revenue, Major Customer
Concentration percentage (as a percent)	24.00%	20.00%
Customer concentration risk | Receivables | Customer 2
Revenue, Major Customer
Concentration percentage (as a percent)	18.00%	10.00%
Customer concentration risk | Receivables | Customer 3
Revenue, Major Customer
Concentration percentage (as a percent)	0.00%	18.00%
Vendor Concentration Risk | Purchases Benchmark | Vendor One
Revenue, Major Customer
Concentration percentage (as a percent)	70.00%	62.00%
Vendor Concentration Risk | Accounts Payable Benchmark | Vendor One
Revenue, Major Customer
Concentration percentage (as a percent)	65.00%	72.00%