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SHAREHOLDERS' EQUITY (Schedule Of Option Activity) (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Employees and Directors [Member] |  |
Number of options |  |
Options outstanding at beginning of year | 7,604,651 |
Options granted | 1,842,900 |
Options exercised | 161,536 |
Options forfeited | 637,432 |
Options expired |  |
Options outstanding at end of year | 8,648,583 | 7,604,651
Exercisable at end of year | 5,542,991 |
Weighted average exercise price |  |
Options outstanding at beginning of year | $ 5.17 |
Options granted | 2.98 |
Options exercised | 1.25 |
Options forfeited | 6.01 |
Options outstanding at end of year | 4.72 | $ 5.17
Exercisable at end of year | $ 4.86 |
Weighted average remaining contractual life |  |
Options outstanding | 6 years 11 days | 6 years 3 months 8 days
Exercisable at end of year | 4 years 3 months 29 days |
Aggregate intrinsic value |  |
Options outstanding at beginning of year | $ 6,535 |
Options outstanding at end of year | 1,364 | $ 6,535
Exercisable at end of year | $ 1,364 |
Non-employees [Member] |  |
Number of options |  |
Options outstanding at beginning of year | 736,820 |
Options granted | 170,000 |
Options exercised |  |
Options forfeited | 10,000 |
Options expired | 103,820 |
Options outstanding at end of year | 793,000 | 736,820
Exercisable at end of year | 345,500 |
Weighted average exercise price |  |
Options outstanding at beginning of year | $ 6.31 |
Options granted | 3.31 |
Options exercised |  |
Options forfeited | 4.65 |
Options expired | 5.46 |
Options outstanding at end of year | 5.80 | $ 6.31
Exercisable at end of year | $ 6.79 |
Weighted average remaining contractual life |  |
Options outstanding | 4 years 4 months 20 days | 4 years 4 months 17 days
Exercisable at end of year | 4 years 1 month 13 days |

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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan. + 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 (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements. + 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 (c)(1)(iv)(4) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan. + 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 (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Gross number of share options (or share units) granted during the period. + References No definition available. + Details
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- Definition Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. + 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 (c)(1)(i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Weighted-average exercise price, at which grantee can acquire shares reserved for issuance, for fully vested and expected to vest exercisable or convertible options. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur. + 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 (e)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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