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Consolidated Statements of Comprehensive Loss - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Statement Of Income And Comprehensive Income [Abstract]      
Net loss $ (106,794) $ (90,722) $ (66,720)
Other comprehensive (loss) income:      
Unrealized gain (loss) on marketable securities available-for-sale 11 32 (76)
Cumulative foreign currency translation adjustments (1,272) (1,553) 523
Total other comprehensive (loss) income (1,261) (1,521) 447
Total comprehensive loss $ (108,055) $ (92,243) $ (66,273)