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STOCK COMPENSATION EXPENSE (Details ) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Net income (loss) $ 11,647 $ (26,638)
Net income (loss) per share    
Basic (in dollars per share) $ 0.29 $ (0.94)
Diluted (in dollars per share) $ 0.27 $ (0.94)
Number of shares used for computing (weighted average)    
Basic (in shares) 40,207 28,312
Diluted (in shares) 42,879 28,312
Stock-based compensation (ASC 718)    
Total $ 1,751 $ 772
Net income (loss) before stock-based compensation $ 13,398 $ (25,866)
Net income (loss) before stock-based compensation per share    
Basic (in dollars per share) $ 0.33 $ (0.91)
Diluted (in dollars per share) $ 0.31 $ (0.91)
Cost of Products and Services Sold [Member]    
Stock-based compensation (ASC 718)    
Total $ 0 $ 10
Research and Development [Member]    
Stock-based compensation (ASC 718)    
Total 459 343
Selling, General and Administrative [Member]    
Stock-based compensation (ASC 718)    
Total $ 1,292 $ 419