Revenues and Concentrations of Risk (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	May 04, 2019	May 05, 2018	Feb. 02, 2019
Revenues From External Customers And Long Lived Assets [Line Items]
Revenues	$ 5,052	$ 5,402
Long-lived tangible assets	539		$ 620
Deferred revenue	1,700		$ 2,200
Revenue recognized	$ 700	$ 900
Customer Concentration Risk | Accounts Receivable | Three Licensees
Revenues From External Customers And Long Lived Assets [Line Items]
Concentration risk (as a percent)	37.00%
Customer Concentration Risk | Accounts Receivable | Two Licensees
Revenues From External Customers And Long Lived Assets [Line Items]
Concentration risk (as a percent)			29.00%
Customer Concentration Risk | Revenues | Two Licensees
Revenues From External Customers And Long Lived Assets [Line Items]
Concentration risk (as a percent)	28.00%	23.00%
U.S. and Canada
Revenues From External Customers And Long Lived Assets [Line Items]
Revenues	$ 1,342	$ 1,823
Europe
Revenues From External Customers And Long Lived Assets [Line Items]
Revenues	845	852
Middle East, India and Africa
Revenues From External Customers And Long Lived Assets [Line Items]
Revenues	793	1,043
Asia/Pacific
Revenues From External Customers And Long Lived Assets [Line Items]
Revenues	1,393	888
Latin America
Revenues From External Customers And Long Lived Assets [Line Items]
Revenues	679	$ 796
United States
Revenues From External Customers And Long Lived Assets [Line Items]
Long-lived tangible assets	100		$ 200
Non-US
Revenues From External Customers And Long Lived Assets [Line Items]
Long-lived tangible assets	$ 400		$ 400