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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
CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS      
Net loss $ (38,379) $ (68,881) $ (96,853)
Other comprehensive income (loss):      
Net unrealized (loss) gain on available-for-sale securities (54) (38) 6
Foreign currency translation adjustments   16 (1)
Reclassification of accumulated foreign currency translation adjustments   153  
Other comprehensive (loss) income (54) 131 5
Comprehensive loss $ (38,433) $ (68,750) $ (96,848)