Warranty (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2020	Jan. 31, 2019
Warranty claim activity
Beginning accrued warranty balance	$ 700	$ 925
Provision	570	600
Provision for (benefits from) prior year	(145)	(555)
Costs incurred	(325)	(270)
Ending accrued warranty balance	$ 800	$ 700
Minimum [Member]
Warranty [Line Items]
Product warranty period	10 years
Maximum [Member]
Warranty [Line Items]
Product warranty period	10 years