NET INCOME (LOSS) PER SHARE (Details 2) - shares shares in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
EARNINGS PER SHARE
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	6,774	2,454	6,979	1,838
Employee Stock Option
EARNINGS PER SHARE
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	4,632	2,235	4,403	1,765
Restricted Stock Units (RSUs)
EARNINGS PER SHARE
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	372	203	265	68
Conversion premium on the Notes
EARNINGS PER SHARE
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	1,750	0	2,288	0
Warrants
EARNINGS PER SHARE
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	0	0	1	0
Employee Stock
EARNINGS PER SHARE
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	20	16	22	5