NET INCOME (LOSS) PER SHARE - Schedule of Anti-Dilutive Shares (Details) - shares	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total potentially dilutive common shares (in shares)	21,632,000	23,549,000	21,302,000
Convertible debt
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total potentially dilutive common shares (in shares)	17,931,000	17,931,000	17,931,000
Stock options and equivalents
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total potentially dilutive common shares (in shares)	3,701,000	5,618,000	3,371,000