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Consolidated Statements of Comprehensive Loss (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Statement Of Partners Capital [Abstract]      
Net loss $ (116,389) $ (83,132) $ (53,901)
Other comprehensive income (loss), net:      
Change in unrealized gain/loss on available-for-sale securities (240) 642 (276)
Foreign currency translation adjustment (3,155) (252) (473)
Other comprehensive income (loss) (3,395) 390 (749)
Total comprehensive loss $ (119,784) $ (82,742) $ (54,650)