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Consolidated Statements of Comprehensive Loss - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Net loss $ (23,490) $ (38,890) $ (53,979)
Other comprehensive (loss) income:      
Unrealized gain on marketable securities $ 81 1,371
Foreign currency translation adjustment 3
Reclassification adjustment:      
Net recognized gain on marketable securities previously included in other comprehensive (loss) income $ (1,728) (1,779)
Comprehensive loss $ (23,490) $ (40,537) $ (54,384)