EARNINGS (LOSS) PER SHARE - Narrative (Details) - shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Stock options
Earnings Per Share [Abstract]
Securities excluded from computation of diluted loss per share (in shares)	688,200	471,800	2,900,000
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Securities excluded from computation of diluted loss per share (in shares)	688,200	471,800	2,900,000
RSUs
Earnings Per Share [Abstract]
Securities excluded from computation of diluted loss per share (in shares)	10,900	19,000.0	21,200
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Securities excluded from computation of diluted loss per share (in shares)	10,900	19,000.0	21,200
Warrants
Earnings Per Share [Abstract]
Securities excluded from computation of diluted loss per share (in shares)			9,000,000.0
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Securities excluded from computation of diluted loss per share (in shares)			9,000,000.0