Revenues and Concentrations of Risk (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Oct. 31, 2020	Nov. 02, 2019	Oct. 31, 2020	Nov. 02, 2019	Feb. 01, 2020
Revenues From External Customers And Long Lived Assets [Line Items]
Revenues	$ 4,050	$ 4,894	$ 12,463	$ 15,549
Long-lived tangible assets	240		240		$ 319
Deferred revenue	1,600		1,600		$ 3,800
Revenue recognized	$ 700	$ 100	$ 2,700	$ 1,500
Customer Concentration Risk | Accounts Receivable | Two Licensees
Revenues From External Customers And Long Lived Assets [Line Items]
Concentration risk (as a percent)			31.00%
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)		29.00%	34.00%	27.00%
Customer Concentration Risk | Revenues | Three Licensees
Revenues From External Customers And Long Lived Assets [Line Items]
Concentration risk (as a percent)	46.00%
U.S. and Canada
Revenues From External Customers And Long Lived Assets [Line Items]
Revenues	$ 1,093	$ 1,358	$ 3,149	$ 4,080
EMEA
Revenues From External Customers And Long Lived Assets [Line Items]
Revenues	1,202	1,143	3,526	3,964
Asia-Pacific
Revenues From External Customers And Long Lived Assets [Line Items]
Revenues	1,003	1,723	3,625	5,261
Latin America
Revenues From External Customers And Long Lived Assets [Line Items]
Revenues	752	$ 670	2,163	$ 2,244
United States
Revenues From External Customers And Long Lived Assets [Line Items]
Long-lived tangible assets	100		100		$ 200
Non-US
Revenues From External Customers And Long Lived Assets [Line Items]
Long-lived tangible assets	$ 100		$ 100		$ 200