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STATEMENTS OF COMPREHENSIVE LOSS (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
STATEMENTS OF COMPREHENSIVE LOSS [Abstract]        
Net loss $ (19,727) $ (15,300) $ (51,401) $ (37,929)
Other comprehensive income (loss):        
Net unrealized gains (losses) on investments available-for-sale (54) (33) (28) 174
Reclassification adjustment for gains included in net loss       (615)   
Foreign currency translation adjustment (2,764) 509 (4,307) 509
Other comprehensive income (loss) (2,818) 476 (4,950) 683
Comprehensive loss $ (22,545) $ (14,824) $ (56,351) $ (37,246)