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CONSOLIDATED STATEMENT OF CHANGES IN SHAREHOLDERS' EQUITY - USD ($)
$ in Thousands
Ordinary shares [Member]
Additional paid-in capital [Member]
Capital notes [Member]
Unearned compensation [Member]
Accumulated other comprehensive income (loss) [Member]
Foreign currency translation adjustments [Member]
Accumulated deficit [Member]
Treasury stock [Member]
Comprehensive income (loss) [Member]
Noncontrolling interest [Member]
Total
BALANCE at Dec. 31, 2014 $ 235,117 $ 1,137,946 $ 60,704 $ 50,017 $ (376) $ (25,350) $ (1,244,007) $ (9,072)   $ (9,418) $ 195,561
BALANCE, SHARES at Dec. 31, 2014 58,120,000                    
Conversion of debentures and exercise of warrants into share capital $ 79,443 126,989                 206,432
Conversion of debentures and exercise of warrants into share capital, shares 20,904,000                    
Exercise of options $ 6,261 1,730                 $ 7,991
Exercise of options, shares 1,620,000                   1,620,056
Capital notes converted into share capital $ 5,751 6,400 (12,151)              
Capital notes converted into share capital, shares 1,500,000                    
Employee stock-based compensation       8,192             8,192
Stock-based compensation related to the Facility Agreement with the Banks   480                 480
Dividend paid to Panasonic                   (1,570) (1,570)
Other comprehensive income (loss):                      
Profit (loss)             (29,647)   $ (29,647) 520 (29,127)
Foreign currency translation adjustments           (1,196)     (1,196) (1,289) (2,485)
Change in employees plan assets and benefit obligations         176       176   176
Unrealized gain (loss) on derivatives         (64)       (64)   (64)
Comprehensive loss                 (30,731)   (30,731)
BALANCE at Dec. 31, 2015 $ 326,572 1,273,545 48,553 58,209 (264) (26,546) (1,273,654) (9,072)   (11,757) 385,586
BALANCE, SHARES at Dec. 31, 2015 82,144,000                    
Issuance of shares $ 12,504 27,496                 40,000
Issuance of shares, shares 3,297,000                    
Conversion of debentures and exercise of warrants into share capital $ 12,069 10,223                 22,292
Conversion of debentures and exercise of warrants into share capital, shares 3,080,000                    
Exercise of options $ 14,412 3,192                 $ 17,604
Exercise of options, shares 3,650,000                   3,649,754
Capital notes converted into share capital $ 3,500 3,789 (7,289)              
Capital notes converted into share capital, shares 900,000                    
Employee stock-based compensation       9,406             9,406
Stock-based compensation related to the Facility Agreement with the Banks   480                 480
Dividend paid to Panasonic                   (2,563) (2,563)
Accumulated amount due to adoption of ASU No. 2016-09, Compensation - Stock Compensation (Topic 718)       1,306     (1,306)      
Other comprehensive income (loss):                      
Profit (loss)             203,924   203,924 5,242 209,166
Foreign currency translation adjustments           (737)     (737) 1,660 923
Change in employees plan assets and benefit obligations         (546)       (546)   (546)
Unrealized gain (loss) on derivatives         266       266   266
Comprehensive loss                 202,907   202,907
BALANCE at Dec. 31, 2016 $ 369,057 1,318,725 41,264 68,921 (544) (27,283) (1,071,036) (9,072)   (7,418) 682,614
BALANCE, SHARES at Dec. 31, 2016 93,071,000                    
Issuance of shares $ 12,128 4,247                 16,375
Issuance of shares, shares 2,914,000                    
Conversion of debentures and exercise of warrants into share capital                
Conversion of debentures and exercise of warrants into share capital, shares                    
Exercise of options $ 6,750 8,180                 $ 14,930
Exercise of options, shares 1,629,000                   1,611,489
Capital notes converted into share capital $ 3,792 16,714 (20,506)              
Capital notes converted into share capital, shares 930,000                    
Employee stock-based compensation       11,644             11,644
Stock-based compensation related to the Facility Agreement with the Banks                  
Dividend paid to Panasonic                   (5,501) (5,501)
Other comprehensive income (loss):                      
Profit (loss)             298,011   298,011 3,645 301,656
Foreign currency translation adjustments           2,761     2,761 2,920 5,681
Change in employees plan assets and benefit obligations         511       511   511
Unrealized gain (loss) on derivatives         1,796       1,796   1,796
Comprehensive loss                 $ 303,079   303,079
BALANCE at Dec. 31, 2017 $ 391,727 $ 1,347,866 $ 20,758 $ 80,565 $ 1,763 $ (24,522) $ (773,025) $ (9,072)   $ (6,354) $ 1,029,706
BALANCE, SHARES at Dec. 31, 2017 98,544,000                    
OUTSTANDING SHARES, NET OF TREASURY STOCK AS OF DECEMBER 31, 2017 at Dec. 31, 2017 98,458,000