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NET INCOME (LOSS) PER SHARE (Details 2) - shares
shares in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Potential dilutive effect of securities (in shares) 1,998 6,039 5,378
Stock options      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Potential dilutive effect of securities (in shares) 1,891 3,534 3,980
Restricted Stock Units (RSUs) [Member]      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Potential dilutive effect of securities (in shares) 99 0 0
Convertible debt      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Potential dilutive effect of securities (in shares) 0 2,483 1,194
Warrants      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Potential dilutive effect of securities (in shares) 0 21 204
Employee Stock [Member]      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Potential dilutive effect of securities (in shares) 8 1 0