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Condensed Consolidated 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
Statement Of Income And Comprehensive Income [Abstract]        
Net loss $ (29,819) $ (15,675) $ (68,436) $ (53,664)
Other comprehensive income (loss):        
Unrealized (loss) gain on marketable securities available-for-sale (1) 18 69 (23)
Cumulative foreign currency translation adjustment (921) 473 (1,027) 299
Total other comprehensive (loss) gain (922) 491 (958) 276
Total comprehensive loss $ (30,741) $ (15,184) $ (69,394) $ (53,388)