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CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Consolidated Statements of Comprehensive Loss    
Net loss $ (23,862) $ (15,654)
Other comprehensive income (loss), net of tax    
Net change in unrealized (loss) gains on available-for-sale securities 1 (3)
Cumulative translation adjustment (649)  
Other comprehensive income (loss), net of tax (648) (3)
Comprehensive loss $ (24,510) $ (15,657)