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NET INCOME (LOSS) PER SHARE (Details 2) - shares
shares in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Potential dilutive effect of securities (in shares) 6,065 6,060 6,816
Stock options      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Potential dilutive effect of securities (in shares) 5,492 5,171 4,482
Restricted Stock Units (RSUs) [Member]      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Potential dilutive effect of securities (in shares) 542 449 290
Convertible debt      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Potential dilutive effect of securities (in shares) 0 411 2,022
Warrants      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Potential dilutive effect of securities (in shares) 0 0 1
ESPP purchase options      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Potential dilutive effect of securities (in shares) 31 29 21