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CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY - USD ($) $ in Thousands | Total | Ordinary Shares [Member] | Additional Paid-in Capital [Member] | Accumulated other comprehensive income (loss) [Member] | Accumulated Deficit [Member]
--- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2012 | $ 241,957 | $ 1,909 | $ 869,822 | $ 2,864 | $ (632,638)
Balance, shares at Dec. 31, 2012 |  | 41,700,100 |  |  |
Issuance of restricted share units (RSU) | 15 | $ 15 |  |  |
Issuance of restricted share units (RSU), shares |  | 271,176 |  |  |
Stock-based compensation of options and RSUs | 2,665 |  | $ 2,665 |  |
Exercise of stock options | 566 | $ 8 | $ 558 |  |
Exercise of stock options, shares |  | 154,498 |  |  |
Comprehensive loss | (19,170) |  |  | $ (1,273) | $ (17,897)
Balance at Dec. 31, 2013 | 226,033 | $ 1,932 | $ 873,045 | $ 1,591 | $ (650,535)
Balance, shares at Dec. 31, 2013 |  | 42,125,774 |  |  |
Issuance of restricted share units (RSU) | 19 | $ 19 |  |  |
Issuance of restricted share units (RSU), shares |  | 332,650 |  |  |
Stock-based compensation of options and RSUs | 2,427 |  | $ 2,427 |  |
Exercise of stock options | 1,167 | $ 15 | $ 1,152 |  |
Exercise of stock options, shares |  | 272,000 |  |  |
Comprehensive loss | (4,507) |  |  | $ (3,011) | $ (1,496)
Balance at Dec. 31, 2014 | $ 225,139 | $ 1,966 | $ 876,624 | $ (1,420) | $ (652,031)
Balance, shares at Dec. 31, 2014 | 42,730,424 | 42,730,424 |  |  |
Issuance of restricted share units (RSU) | $ 14 | $ 14 |  |  |
Issuance of restricted share units (RSU), shares |  | 283,175 |  |  |
Stock-based compensation of options and RSUs | 1,901 |  | $ 1,901 |  |
Exercise of stock options | 5,669 | $ 68 | $ 5,601 |  |
Exercise of stock options, shares |  | 1,319,448 |  |  |
Comprehensive loss | (54,641) |  |  | $ (2,307) | $ (52,334)
Balance at Dec. 31, 2015 | $ 178,082 | $ 2,048 | $ 884,126 | $ (3,727) | $ (704,365)
Balance, shares at Dec. 31, 2015 | 44,333,047 | 44,333,047 |  |  |

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