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Balance Sheet Components - Components of Other Current Assets (Details) - USD ($)
$ in Thousands
Apr. 30, 2019
Jan. 31, 2019
Prepaid Expense And Other Assets Current [Abstract]    
Prepaid expenses $ 2,342 $ 2,681
Deferred sales commissions, current 1,395 1,081
Deferred inventory costs 403 334
Other current assets 1,244 1,354
Total other current assets $ 5,384 $ 5,450