Stockholders' Equity - Activity In Unvested Common Shares (Details) - Restricted Stock and Performance Stock Units - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Feb. 02, 2019	Feb. 03, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
Compensation expense (in dollars)	$ 0.7	$ 1.3
Number of Shares
Unvested stock at the beginning of the period (in shares)	212,985	157,169
Granted (in shares)	984,617	185,951
Vested (in shares)	(348,753)	(101,468)
Forfeited (in shares)	(144,894)	(28,667)
Unvested stock at the end of the period (in shares)	703,955	212,985
Weighted Average Grant-Date Fair Value
Unvested stock at the beginning of the period (in dollars per share)	$ 7.64	$ 19.71
Granted (in dollars per share)	0.76	2.23
Vested (in dollars per share)	3.77	13.69
Forfeited (in dollars per share)	3.25	17.31
Unvested stock at the end of the period (in dollars per share)	$ 0.83	$ 7.64
Unrecognized stock-based compensation
Unrecognized stock-based compensation expense (in dollars)	$ 0.5
Weighted average period for recognition of unrecognized stock-based compensation expense	2 years 7 months 6 days