Segment Information - Revenue by Sales Channel (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 26, 2020	Jul. 28, 2019	Jul. 26, 2020	Jul. 28, 2019
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	$ 143,660	$ 137,146	$ 276,362	$ 268,500
Concentration risk, percentage	100.00%	100.00%	100.00%	100.00%
Net sales
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	100.00%	100.00%	100.00%	100.00%
Distributor
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	$ 116,545	$ 99,138	$ 220,493	$ 180,280
Concentration risk, percentage	81.00%	72.00%	80.00%	67.00%
Direct
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	$ 27,115	$ 38,008	$ 55,869	$ 88,220
Concentration risk, percentage	19.00%	28.00%	20.00%	33.00%