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Consolidated Statements of Comprehensive Loss - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Statement of Comprehensive Income [Abstract]      
Net loss $ (251,576) $ (128,081) $ (79,000)
Other comprehensive loss:      
Unrealized gain on marketable securities, net of tax 724 9 225
Foreign currency translation (loss) gain, net of tax (12,770) (2,516) 5,229
Comprehensive loss $ (263,622) $ (130,588) $ (73,546)