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Condensed Consolidated Statements of Comprehensive Loss (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Net loss $ (13,840) $ (20,825)
Other comprehensive income (loss):    
Unrealized gain (loss) on marketable securities available-for-sale 69 (8)
Cumulative foreign currency translation adjustment (9) (347)
Total other comprehensive gain (loss) 60 (355)
Total comprehensive loss $ (13,780) $ (21,180)