Schedule II (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2018	Jan. 31, 2017	Jan. 31, 2016
Valuation and Qualifying Accounts Disclosure [Line Items]
Allowance for Doubtful Accounts Receivable	$ 469	$ 305	$ 33
Allowance for Doubtful Accounts Receivable, Period Increase (Decrease)	247	246
Allowance for Doubtful Accounts Receivable, Charge-offs	135	1
Valuation Allowances and Reserves, Charged to Other Accounts	$ 52	$ 27