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Consolidated Statements of Comprehensive Loss - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Consolidated Statements of Comprehensive Loss        
Net loss $ (48,136) $ (51,050) $ (103,129) $ (94,741)
Other comprehensive (loss)/ gain:        
Foreign currency translation adjustment (loss)/ gain (1,678) 907 (2,136) 842
Unrealized (loss)/ gain on available-for-sale securities (155) 87 (72) 316
Other comprehensive (loss)/income (1,833) 994 (2,208) 1,158
Comprehensive loss $ (49,969) $ (50,056) $ (105,337) $ (93,583)