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Condensed Consolidated Statements of Comprehensive Loss (Unaudited) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Statement Of Income And Comprehensive Income [Abstract]        
Net loss $ (34,694) $ (30,124) $ (90,703) $ (79,932)
Other comprehensive income (loss):        
Unrealized (loss) gain on marketable securities available-for-sale (61) 5 7 4
Cumulative foreign currency translation adjustments 208 162 511 (895)
Total other comprehensive income (loss) 147 167 518 (891)
Total comprehensive loss $ (34,547) $ (29,957) $ (90,185) $ (80,823)