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Condensed Consolidated Statements of Comprehensive Loss (Unaudited) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Statement Of Income And Comprehensive Income [Abstract]        
Net loss $ (30,124) $ (29,819) $ (79,932) $ (68,436)
Other comprehensive income (loss):        
Unrealized gain (loss) on marketable securities available-for-sale 5 (1) 4 69
Cumulative foreign currency translation adjustments 162 (921) (895) (1,027)
Total other comprehensive income (loss) 167 (922) (891) (958)
Total comprehensive loss $ (29,957) $ (30,741) $ (80,823) $ (69,394)