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NET INCOME (LOSS) PER SHARE (Details 2) - shares shares in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potential dilutive effect of securities (in shares)	6,060	6,816	1,998
Stock options
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potential dilutive effect of securities (in shares)	5,171	4,482	1,891
Restricted Stock Units (RSUs) [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potential dilutive effect of securities (in shares)	449	290	99
Convertible debt
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potential dilutive effect of securities (in shares)	411	2,022	0
Warrants
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potential dilutive effect of securities (in shares)	0	1	0
ESPP purchase options
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potential dilutive effect of securities (in shares)	29	21	8

X

- Definition

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

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- Definition

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+ References

No definition available.

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