COMMON STOCK - Narrative (Details)	12 Months Ended
	Dec. 31, 2019 vote / shares $ / shares shares	Dec. 31, 2018 $ / shares shares
Conversion of Stock [Line Items]
Common stock, shares authorized (in shares)	750,000,000	750,000,000
Common stock, par value (in dollars per share) | $ / shares	$ 0.001	$ 0.001
Common stock, shares issued (in shares)	43,395,563	40,174,821
Common stock, shares outstanding (in shares)	43,395,563	40,174,821
Number of votes per share of common stock | vote / shares	1
Shares issued as result of options exercised (in shares)	112,500	7,500
Preferred Stock
Conversion of Stock [Line Items]
New shares issued resulting due to stock conversion (in shares)	1,642,317	7,199,774
Common Stock
Conversion of Stock [Line Items]
Common stock, par value (in dollars per share) | $ / shares	$ 0.001
New shares issued resulting due to stock conversion (in shares)		241
Common stock issued in acquisition (in shares)	1,500,000
Shares issued as result of options exercised (in shares)	78,425	241
Shares issued pursuant to the earnout provisions (in shares)		150,000
Paid-in-kind dividends, common stock (in shares)		166,630
Common Stock | Nickco Recycling, LLC
Conversion of Stock [Line Items]
Shares issued pursuant to the earnout provisions (in shares)		150,000