Stock Compensation Plans - Stock Option Activity under Two Thousand Six And Two Thousand Sixteen Plan (Details) - Employee Stock Plan, 2006 Plan and 2016 Plan $ / shares in Units, $ in Thousands	12 Months Ended
	Jan. 30, 2021 USD ($) $ / shares shares
Number of Shares
Outstanding options at beginning of year | shares	754,833
Options granted | shares	3,185,542
Options canceled or expired | shares	(292,794)
Outstanding options at end of year | shares	3,647,581
Options exercisable at end of year | shares	462,039
Vested and expected to vest at end of year | shares	3,647,581
Weighted-average exercise price per option
Outstanding options at beginning of year	$ 4.84
Options granted	0.55
Options canceled or expired	4.85
Outstanding options at end of year	1.09
Options exercisable at end of year	4.83
Vested and expected to vest at end of year	$ 1.09
Weighted-average remaining contractual term
Outstanding options at end of year	8 years 6 months
Options exercisable at end of year	2 years 8 months 12 days
Vested and expected to vest at end of year	8 years 6 months
Aggregate Intrinsic Value
Options granted	$ 2
Outstanding options at end of year | $	$ 811
Vested and expected to vest at end of year | $	$ 811