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Commitments and Contingencies (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Aug. 03, 2019	Aug. 04, 2018	Aug. 03, 2019	Aug. 04, 2018	Feb. 02, 2019
Operating Leases Future Minimum Payments Due [Abstract]
Operating lease cost excluding variable lease costs and sublease income	$ 100		$ 300
Lease expense recognized		$ 200		$ 400
Operating lease, Weighted-average remaining lease term	6 years 4 months 24 days		6 years 4 months 24 days
Operating lease, Weighted-average IBR	8.80%		8.80%
Operating lease, right-of-use asset	$ 4,300		$ 4,300
Remainder of Fiscal 2020	485		485
Fiscal 2021	886		886
Fiscal 2022	898		898
Fiscal 2023	881		881
Fiscal 2024	890		890
Thereafter	1,589		1,589
Total future minimum lease payments	5,629		5,629
Less imputed interest	(1,317)		(1,317)
Operating lease obligations	$ 4,312		$ 4,312
Fiscal 2020					$ 854
Fiscal 2021					865
Fiscal 2022					876
Fiscal 2023					857
Fiscal 2024					863
Thereafter					1,673
Total future minimum lease payments					$ 5,988