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Balance Sheet Components - Schedule of Prepaid Expenses and Other Current Assets (Details) - USD ($)
$ in Thousands
Apr. 30, 2018
Jan. 31, 2018
Deferred Costs Capitalized Prepaid And Other Assets Disclosure [Abstract]    
Prepaid expenses $ 13,388 $ 8,494
Other current assets 4,187 2,897
Total prepaid expenses and other current assets $ 17,575 $ 11,391