Revenues and Concentrations of Risk (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Aug. 01, 2020	Aug. 03, 2019	Aug. 01, 2020	Aug. 03, 2019	Feb. 01, 2020
Revenues From External Customers And Long Lived Assets [Line Items]
Revenues	$ 4,379	$ 5,603	$ 8,413	$ 10,655
Long-lived tangible assets	268		268		$ 319
Deferred revenue	2,300		2,300		$ 3,800
Revenue recognized	$ 700	$ 700	$ 1,900	$ 1,400
Customer Concentration Risk | Accounts Receivable | Three Licensees
Revenues From External Customers And Long Lived Assets [Line Items]
Concentration risk (as a percent)			40.00%
Customer Concentration Risk | Accounts Receivable | Four Licensees
Revenues From External Customers And Long Lived Assets [Line Items]
Concentration risk (as a percent)					45.00%
Customer Concentration Risk | Revenues | Three Licensees
Revenues From External Customers And Long Lived Assets [Line Items]
Concentration risk (as a percent)	42.00%
Customer Concentration Risk | Revenues | Two Licensees
Revenues From External Customers And Long Lived Assets [Line Items]
Concentration risk (as a percent)		25.00%	33.00%	26.00%
U.S. and Canada
Revenues From External Customers And Long Lived Assets [Line Items]
Revenues	$ 1,029	$ 1,380	$ 2,056	$ 2,722
EMEA
Revenues From External Customers And Long Lived Assets [Line Items]
Revenues	1,192	1,472	2,324	2,821
Asia-Pacific
Revenues From External Customers And Long Lived Assets [Line Items]
Revenues	1,352	1,856	2,622	3,538
Latin America
Revenues From External Customers And Long Lived Assets [Line Items]
Revenues	806	$ 895	1,411	$ 1,574
United States
Revenues From External Customers And Long Lived Assets [Line Items]
Long-lived tangible assets	200		200		$ 200
Non-US
Revenues From External Customers And Long Lived Assets [Line Items]
Long-lived tangible assets	$ 100		$ 100		$ 200