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Consolidated Statements of Comprehensive Loss - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Statement of Comprehensive Income [Abstract]      
Net loss $ (348,995) $ (284,002) $ (200,042)
Other comprehensive gain (loss):      
Foreign currency translation adjustment gain (loss), net of tax impact of $0, $0, $0, respectively 2,537 (3,604) 1,945
Unrealized gain (loss) on available-for-sale securities 9 (538) 217
Other comprehensive income (loss) 2,546 (4,142) 2,162
Comprehensive loss $ (346,449) $ (288,144) $ (197,880)