Stock Compensation Plans - Stock Option Activity under Two Thousand Six And Two Thousand Sixteen Plan (Details) - Employee Stock Plan, 2006 Plan and 2016 Plan	12 Months Ended
	Jan. 28, 2017 USD ($) $ / shares shares
Number of Shares
Outstanding options at beginning of year	2,728,621
Options granted	9,004
Options canceled	(213,079)
Options exercised	0
Outstanding options at end of year	2,524,546
Options exercisable at end of year	1,464,605
Vested and expected to vest at end of year	1,464,605
Weighted-average exercise price per option
Outstanding options at beginning of year | $ / shares	$ 5.00
Options granted | $ / shares	4.44
Options canceled | $ / shares	5.24
Outstanding options at end of year | $ / shares	4.98
Options exercisable at end of year | $ / shares	4.91
Vested and expected to vest at end of year | $ / shares	$ 4.91
Weighted-average remaining contractual term
Outstanding options at end of year	5 years 10 months 24 days
Options exercisable at end of year	5 years 7 months 6 days
Vested and expected to vest at end of year	5 years 7 months 6 days
Aggregate Intrinsic Value
Outstanding options at end of year | $	$ 11,286
Options exercisable at end of year | $	11,286
Vested and expected to vest at end of year | $	$ 11,286