Segment Information - Revenue by Sales Channel (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 28, 2019	Jul. 29, 2018	Jul. 28, 2019	Jul. 29, 2018
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	$ 137,146	$ 163,211	$ 268,500	$ 293,640
Distributor
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	99,138	109,844	180,280	212,317
Direct
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	38,008	53,367	88,220	102,824
Other: Warrant Shares
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue offset	$ 0	$ 0	$ 0	$ 21,501