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Shareholders' Equity | 12 Months Ended
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Dec. 31, 2012
Shareholders' Equity [Abstract] |
Shareholders' Equity |
NOTE 14:- | SHAREHOLDERS' EQUITY
The Ordinary shares of the Company are traded on Nasdaq Global Market and on the Tel Aviv Stock Exchange, under the symbol "CRNT".
| a. | General:
The ordinary shares entitle their holders to receive notice to participate and vote in general meetings of the Company, the right to share in distributions upon liquidation of the Company, and to receive dividends, if declared.
| b. | Stock options plans:
| 1. | Under the Company's 2003 Share Option Plan ("the Plan"), options may be granted to officers, directors, employees and consultants of the Company or its subsidiaries. The options vest primarily over four years. The options expire ten years from the date of grant. On December 2012, the Company extended the term of the Plan for an additional period of ten years.
| Upon adoption of the Plan, the Company reserved for issuance 17,920,688 ordinary shares in accordance with the respective terms thereof. As of December 31, 2012, the Company has 218,414 Ordinary shares available for future grant under the Plan. Any options, which are canceled or forfeited before the expiration date, become available for future grants.
| 2. | On September 6, 2010, the Company's board of directors amended the Plan so as to enable to grant Restricted share Units ("RSUs") pursuant to such Plan.
| 3. | The following is a summary of the Company's stock options and RSUs granted among the various plans:
|  | Year ended December 31, 2010 |
|  | Number of options and RSUs |  |  | Weighted average exercise price |  |  | Weighted average remaining contractual term (in years) |  |  | Aggregate intrinsic value |
Outstanding at beginning of year |  |  | 5,388,323 |  |  | $ | 5.87 |  |  |  |  |  |  |
Granted *) |  |  | 922,500 |  |  | $ | 8.27 |  |  |  |  |  |  |
Exercised |  |  | (979,982 | ) |  | $ | 5.04 |  |  |  |  |  |  |
Forfeited or expired |  |  | (402,605 | ) |  | $ | 9.92 |  |  |  |  |  |  |
Outstanding at end of the year |  |  | 4,928,236 |  |  | $ | 6.15 |  |  |  | 6.38 |  |  | $ | 34,698 |
Options exercisable at end of the year |  |  | 3,192,108 |  |  | $ | 5.53 |  |  |  | 5.33 |  |  | $ | 24,455 |
Vested and expected to vest |  |  | 4,836,371 |  |  | $ | 6.12 |  |  |  | 6.38 |  |  | $ | 34,193 |
| *) Including 200,000 RSUs granted
|  | Year ended December 31, 2011 |
|  | Number of options and RSUs |  |  | Weighted average exercise price |  |  | Weighted average remaining contractual term (in years) |  |  | Aggregate intrinsic value |
Outstanding at beginning of year *) |  |  | 4,928,236 |  |  | $ | 6.15 |  |  |  |  |  |  |
Granted |  |  | 1,795,502 |  |  | $ | 11.79 |  |  |  |  |  |  |
Exercised (**) |  |  | (1,057,122 | ) |  | $ | 4.24 |  |  |  |  |  |  |
Forfeited or expired |  |  | (210,272 | ) |  | $ | 9.92 |  |  |  |  |  |  |
Outstanding at end of the year |  |  | 5,456,344 |  |  | $ | 8.23 |  |  |  | 7.01 |  |  | $ | 7,256 |
Options exercisable at end of the year |  |  | 2,928,548 |  |  | $ | 6.58 |  |  |  | 5.55 |  |  | $ | 5,547 |
Vested and expected to vest |  |  | 5,198,660 |  |  | $ | 8.08 |  |  |  | 6.91 |  |  | $ | 7,204 |
| *) Including 200,000 RSUs granted **) Including 50,000 RSUs exercised
|  | Year ended December 31, 2012 |
|  | Number of options and RSUs |  |  | Weighted average exercise price |  |  | Weighted average remaining contractual term (in years) |  |  | Aggregate intrinsic value |
Outstanding at beginning of year *) |  |  | 5,456,344 |  |  | $ | 8.23 |  |  |  |  |  |  |
Granted |  |  | 1,217,499 |  |  | $ | 8.45 |  |  |  |  |  |  |
Exercised (**) |  |  | (240,171 | ) |  | $ | 3.04 |  |  |  |  |  |  |
Forfeited or expired |  |  | (306,290 | ) |  | $ | 10.17 |  |  |  |  |  |  |
Outstanding at end of the year |  |  | 6,127,382 |  |  | $ | 8.38 |  |  |  | 7.95 |  |  | $ | 492 |
Options exercisable at end of the year |  |  | 3,801,244 |  |  | $ | 7.62 |  |  |  | 5.52 |  |  | $ | 50 |
Vested and expected to vest |  |  | 5,827,744 |  |  | $ | 8.32 |  |  |  | 7.94 |  |  | $ | 477 |
| *) Including 200,000 RSUs granted **) Including 50,000 RSU's exercised
The Company's options are generally granted at exercise prices which are equal to the average market value of the Ordinary shares in the period of 30 trading day prior to the grant date. The weighted average grant date fair values of the options granted during 2010, 2011 and 2012 were $ 5.89, $ 5.63 and $ 3.82, respectively. Grant date fair value of the RSUs granted during 2010 was $ 9.39. The aggregate intrinsic value in the table above represents the total intrinsic value (the difference between the Company's closing stock price on the last trading day of fiscal 2012 and the exercise price, multiplied by the number of in-the-money options) that would have been received by the option holders had all option holders exercised their options on December 31, 2012. This amount is impacted by the changes in the fair market value of the Company's shares. Total intrinsic value of options exercised during the years ended December 31, 2011 and 2012 were $ 7,278 and $ 874, respectively. As of December 31, 2012, there was $ 4,614 of total unrecognized compensation cost related to non-vested share-based compensation arrangements granted under the Company's stock option plans and $ 790 under the Company's RSUs plan. That cost is expected to be recognized over a weighted-average period of approximately one year. The following is a summary of the Company's stock options and RSUs granted separated into ranges of exercise price:
Exercise price (range) |  |  | Options and RSUs outstanding as of December 31, 2011 |  |  | Weighted average remaining contractual life (years) |  |  | Weighted average exercise price |  |  | Options and RSUs exercisable as of December 31, 2011 |  |  | Remaining contractual life (years for exercisable options |  |  | Weighted average exercise price |
$ |  |  |  |  |  |  |  |  | $ |  |  |  |  |  |  |  |  | $ |
RSUs 0.0 |  |  |  | 150,000 |  |  |  |  |  |  |  |  |  | - |  |  |  |  |  |  | - |
| 0.00-2.00 |  |  |  | 76,275 |  |  |  | 0.51 |  |  |  | 1.48 |  |  |  | 76,275 |  |  |  | 0.51 |  |  |  | 1.48 |
| 2.34-3.90 |  |  |  | 98,475 |  |  |  | 2.93 |  |  |  | 3.89 |  |  |  | 98,475 |  |  |  | 2.93 |  |  |  | 3.89 |
| 4.09-5.98 |  |  |  | 2,044,894 |  |  |  | 5.05 |  |  |  | 5.16 |  |  |  | 1,794,049 |  |  |  | 4.79 |  |  |  | 5.10 |
| 6.12-7.96 |  |  |  | 60,864 |  |  |  | 6.11 |  |  |  | 6.80 |  |  |  | 39,639 |  |  |  | 5.09 |  |  |  | 6.75 |
| 8.16-9.98 |  |  |  | 1,184,004 |  |  |  | 8.26 |  |  |  | 9.11 |  |  |  | 588,290 |  |  |  | 7.59 |  |  |  | 9.13 |
| 10.19-14.3 |  |  |  | 1,841,832 |  |  |  | 8.90 |  |  |  | 12.31 |  |  |  | 331,820 |  |  |  | 7.99 |  |  |  | 11.98 |
|  |  |  |  | 5,456,344 |  |  |  | 7.01 |  |  |  | 8.23 |  |  |  | 2,928,548 |  |  |  | 5.55 |  |  |  | 6.58 |
Exercise price (range) |  |  | Options and RSUs outstanding as of December 31, 2012 |  |  | Weighted average remaining contractual life (years) |  |  | Weighted average exercise price |  |  | Options and RSUs exercisable as of December 31, 2012 |  |  | Remaining contractual life (years for exercisable options |  |  | Weighted average exercise price |
$ |  |  |  |  |  |  |  |  | $ |  |  |  |  |  |  |  |  | $ |
RSUs 0.0 |  |  |  | 100,000 |  |  |  |  |  |  |  |  |  | - |  |  |  |  |  |  |  |
| 0.00-2.00 |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |
| 2.34-3.90 |  |  |  | 94,975 |  |  |  | 2.00 |  |  |  | 3.89 |  |  |  | 94,975 |  |  |  | 2.00 |  |  |  | 3.89 |
| 4.02-5.98 |  |  |  | 2,035,969 |  |  |  | 4.30 |  |  |  | 5.13 |  |  |  | 1,998,447 |  |  |  | 4.23 |  |  |  | 5.12 |
| 6.12-7.96 |  |  |  | 98,364 |  |  |  | 6.86 |  |  |  | 6.87 |  |  |  | 43,264 |  |  |  | 3.79 |  |  |  | 6.79 |
| 8.16-9.98 |  |  |  | 2,095,088 |  |  |  | 8.08 |  |  |  | 9.02 |  |  |  | 757,064 |  |  |  | 6.86 |  |  |  | 9.12 |
| 10.19-14.3 |  |  |  | 1,702,986 |  |  |  | 7.86 |  |  |  | 12.33 |  |  |  | 907,494 |  |  |  | 7.66 |  |  |  | 12.29 |
|  |  |  |  | 6,127,382 |  |  |  | 6.52 |  |  |  | 8.52 |  |  |  | 3,801,244 |  |  |  | 5.51 |  |  |  | 7.62 |
The total equity-based compensation expense related to all of the Company's equity-based awards, recognized for the years ended December 31, 2010, 2011 and 2012, was comprised as follows:
|  | Year ended December 31, |
|  | 2010 |  |  | 2011 |  |  | 2012 |
Cost of revenues |  | $ | 315 |  |  | $ | 255 |  |  | $ | 197 |
Research and development *) |  |  | 814 |  |  |  | 1,536 |  |  |  | 1,638 |
Selling and marketing |  |  | 1,177 |  |  |  | 2,460 |  |  |  | 1,975 |
General and administrative |  |  | 1,901 |  |  |  | 2,313 |  |  |  | 1,650 |
Total stock-based compensation expenses |  | $ | 4,207 |  |  | $ | 6,564 |  |  | $ | 5,460 |
| *) | Including $133, $ 460 and $ 473 compensation expenses related to RSUs for the year ended December 31, 2010, 2011 and 2012, respectively.
| c. | Treasury shares:
In October 2008, the Company initiated a share repurchase program, under which, the Company is authorized to purchase its outstanding Ordinary shares up to aggregate value of $ 20,000. The purchases may be performed in the open market or in negotiated or block transactions, all subject to regulatory requirements. As of December 31, 2009, the Company had completed the share purchase program with a total purchase of 3,481,523 of its outstanding Ordinary shares, at a weighted average price per share of $ 5.74, for the total consideration of approximately $ 20,091 (including commission and broker fees).
| d. | Dividends:
In the event that cash dividends are declared in the future, such dividends will be paid in NIS or in foreign currency subject to any statutory limitations. The Company does not intend to pay cash dividends in the foreseeable future.

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- Definition The entire disclosure for shareholders' equity, comprised of portions attributable to the parent entity and noncontrolling interest, if any, including other comprehensive income (as applicable). Including, but not limited to: (1) balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings; (2) accumulated balance for each classification of other comprehensive income and total amount of comprehensive income; (3) amount and nature of changes in separate accounts, including the number of shares authorized and outstanding, number of shares issued upon exercise and conversion, and for other comprehensive income, the adjustments for reclassifications to net income; (4) rights and privileges of each class of stock authorized; (5) basis of treasury stock, if other than cost, and amounts paid and accounting treatment for treasury stock purchased significantly in excess of market; (6) dividends paid or payable per share and in the aggregate for each class of stock for each period presented; (7) dividend restrictions and accumulated preferred dividends in arrears (in aggregate and per share amount); (8) retained earnings appropriations or restrictions, such as dividend restrictions; (9) impact of change in accounting principle, initial adoption of new accounting principle and correction of an error in previously issued financial statements; (10) shares held in trust for Employee Stock Ownership Plan (ESOP); (11) deferred compensation related to issuance of capital stock; (12) note received for issuance of stock; (13) unamortized discount on shares; (14) description, terms, and number of warrants or rights outstanding; (15) shares under subscription and subscription receivables, effective date of new retained earnings after quasi-reorganization and deficit eliminated by quasi-reorganization and, for a period of at least ten years after the effective date, the point in time from which the new retained dates; and (16) retroactive effective of subsequent change in capital structure. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21488-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30, 31 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 4 -Section E Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Preferred Stock -URI http://asc.fasb.org/extlink&oid=6521494 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21564-112644 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SAB TOPIC 4.C) -URI http://asc.fasb.org/extlink&oid=6959260&loc=d3e187143-122770 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21484-112644 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644 Reference 10: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21506-112644 Reference 11: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6405834&loc=d3e23285-112656 Reference 12: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 43 -Section B -Paragraph 7, 11A -Chapter 1 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. 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Reference 13: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 4 -Section C Reference 14: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 15: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph d -Article 4 Reference 16: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29-31) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 17: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 4.E) -URI http://asc.fasb.org/extlink&oid=6228006&loc=d3e74512-122707 Reference 18: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 5 -Paragraph 15 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. 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