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SHAREHOLDERS' EQUITY (Summary Of Stock Options And RSUs Granted Separated Into Ranges Of Exercise Price) (Details)	12 Months Ended
	Dec. 31, 2017 $ / shares shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Outstanding options | shares	8,267,071
Options and RSUs exercisable | shares	4,902,815
RSUs 0.0 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price, lower range limit	$ 0.00
Exercise price, upper range limit	$ 0.00
Outstanding options | shares	327,093
Outstanding options, Weighted average exercise price	$ 0.00
Options and RSUs exercisable | shares
Exercisable options, Weighted average exercise price	$ 0.00
0.01-2.00 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price, lower range limit	0.01
Exercise price, upper range limit	$ 2.00
Outstanding options | shares	3,567,235
Outstanding options, Weighted average remaining contractual life (years)	3 years 7 months 21 days
Outstanding options, Weighted average exercise price	$ 1.18
Options and RSUs exercisable | shares	1,946,534
Exercisable options, Remaining contractual life (in years)	3 years 7 months 21 days
Exercisable options, Weighted average exercise price	$ 3.54
2.01-4.00 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price, lower range limit	2.01
Exercise price, upper range limit	$ 4.00
Outstanding options | shares	2,186,076
Outstanding options, Weighted average remaining contractual life (years)	4 years 9 months 25 days
Outstanding options, Weighted average exercise price	$ 2.43
Options and RSUs exercisable | shares	769,614
Exercisable options, Remaining contractual life (in years)	4 years 9 months 25 days
Exercisable options, Weighted average exercise price	$ 3.84
4.01-6.00 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price, lower range limit	4.01
Exercise price, upper range limit	$ 6.00
Outstanding options | shares	712,509
Outstanding options, Weighted average remaining contractual life (years)	2 years 6 months 21 days
Outstanding options, Weighted average exercise price	$ 5.16
Options and RSUs exercisable | shares	712,509
Exercisable options, Remaining contractual life (in years)	2 years 6 months 21 days
Exercisable options, Weighted average exercise price	$ 2.56
6.01-8.00 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price, lower range limit	6.01
Exercise price, upper range limit	$ 8.00
Outstanding options | shares	37,000
Outstanding options, Weighted average remaining contractual life (years)	3 years 11 months 23 days
Outstanding options, Weighted average exercise price	$ 6.73
Options and RSUs exercisable | shares	37,000
Exercisable options, Remaining contractual life (in years)	3 years 11 months 23 days
Exercisable options, Weighted average exercise price	$ 3.98
8.01-10.00 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price, lower range limit	8.01
Exercise price, upper range limit	$ 10.00
Outstanding options | shares	777,574
Outstanding options, Weighted average remaining contractual life (years)	3 years 29 days
Outstanding options, Weighted average exercise price	$ 9.07
Options and RSUs exercisable | shares	777,574
Exercisable options, Remaining contractual life (in years)	3 years 29 days
Exercisable options, Weighted average exercise price	$ 3.08
10.01-13.04 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price, lower range limit	10.01
Exercise price, upper range limit	$ 13.04
Outstanding options | shares	659,584
Outstanding options, Weighted average remaining contractual life (years)	2 years 10 months 21 days
Outstanding options, Weighted average exercise price	$ 12.38
Options and RSUs exercisable | shares	659,584
Exercisable options, Remaining contractual life (in years)	2 years 10 months 21 days
Exercisable options, Weighted average exercise price	$ 2.89

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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The number of shares reserved for issuance pertaining to the outstanding exercisable stock options as of the balance sheet date in the customized range of exercise prices for which the market and performance vesting condition has been satisfied.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
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-Section 50
-Paragraph 2
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-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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The number of shares reserved for issuance pertaining to the outstanding stock options as of the balance sheet date for all option plans in the customized range of exercise prices.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(i)-(ii)
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The ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

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-Publisher FASB
-Name Accounting Standards Codification
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Weighted average exercise price as of the balance sheet date for those equity-based payment arrangements exercisable and outstanding.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iii)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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Weighted average remaining contractual term of exercisable stock options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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The weighted average price as of the balance sheet date at which grantees could acquire the underlying shares with respect to all outstanding stock options which are in the customized range of exercise prices.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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