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Condensed Consolidated Statements of Comprehensive Loss (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Net loss $ (15,675) $ (17,791) $ (53,664) $ (49,406)
Other comprehensive income (loss):        
Unrealized gain (loss) on marketable securities available-for-sale 18 59 (23) 32
Cumulative translation adjustment 473 249 299 38
Other comprehensive income 491 308 276 70
Total comprehensive loss $ (15,184) $ (17,483) $ (53,388) $ (49,336)