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Condensed Consolidated Statements of Comprehensive Loss (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Net loss $ (24,777) $ (17,164) $ (38,617) $ (37,989)
Other comprehensive income (loss):        
Unrealized gain (loss) on marketable securities available-for-sale 1 (33) 70 (41)
Cumulative foreign currency translation adjustment (97) 173 (106) (174)
Total other comprehensive (loss) gain (96) 140 (36) (215)
Total comprehensive loss $ (24,873) $ (17,024) $ (38,653) $ (38,204)