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Income Taxes - Schedule of Domestic and Foreign Components of Pre-tax Loss (Details) - USD ($)
$ in Thousands
12 Months Ended
Jan. 31, 2020
Jan. 31, 2019
Jan. 31, 2018
Income Tax Disclosure [Abstract]      
Domestic $ (220,846) $ (128,214) $ (112,858)
Foreign 10,514 2,700 2,688
Loss before benefit from income taxes $ (210,332) $ (125,514) $ (110,170)