Revenues and Concentrations of Risk (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	May 02, 2020	May 04, 2019	Feb. 01, 2020
Revenues From External Customers And Long Lived Assets [Line Items]
Revenues	$ 4,034	$ 5,052
Long-lived tangible assets	316		$ 319
Deferred revenue	2,900		$ 3,800
Revenue recognized	$ 1,300	$ 700
Customer Concentration Risk | Accounts Receivable | Five Licensees
Revenues From External Customers And Long Lived Assets [Line Items]
Concentration risk (as a percent)	60.00%
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 | Two Licensees
Revenues From External Customers And Long Lived Assets [Line Items]
Concentration risk (as a percent)	35.00%	28.00%
U.S. and Canada
Revenues From External Customers And Long Lived Assets [Line Items]
Revenues	$ 1,027	$ 1,342
EMEA
Revenues From External Customers And Long Lived Assets [Line Items]
Revenues	1,132	1,349
Asia-Pacific
Revenues From External Customers And Long Lived Assets [Line Items]
Revenues	1,270	1,682
Latin America
Revenues From External Customers And Long Lived Assets [Line Items]
Revenues	605	$ 679
United States
Revenues From External Customers And Long Lived Assets [Line Items]
Long-lived tangible assets	200		$ 200
Non-US
Revenues From External Customers And Long Lived Assets [Line Items]
Long-lived tangible assets	$ 100		$ 200