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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
Net loss $ (66,720) $ (69,949) $ (48,597)
Other comprehensive income (loss):      
Unrealized (loss) gain on marketable securities available-for-sale (76) 48 14
Cumulative translation adjustment 523 366 (277)
Total other comprehensive income (loss) 447 414 (263)
Total comprehensive loss $ (66,273) $ (69,535) $ (48,860)