STOCK COMPENSATION EXPENSE (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Net Income (loss) $ (26,638) $ (8,829)
Net income (loss) per share    
Basic (in dollars per share) $ (0.94) $ (0.35)
Diluted (in dollars per share) $ (0.94) $ (0.35)
Number of shares used for computing (weighted average)    
Basic (in shares) 28,312 25,415
Diluted (in shares) 28,312 25,415
Stock-based compensation (ASC 718)    
Total 772 495
Net income (loss) before stock-based compensation (25,866) (8,334)
Net income (loss) before stock-based compensation per share    
Basic (in dollars per share) $ (0.91) $ (0.33)
Diluted (in dollars per share) $ (0.91) $ (0.33)
Cost of Products and Services Sold [Member]
   
Stock-based compensation (ASC 718)    
Total 10 5
Research and Development [Member]
   
Stock-based compensation (ASC 718)    
Total 343 191
Selling, General and Administrative [Member]
   
Stock-based compensation (ASC 718)    
Total $ 419 $ 299