Equity Award Plans - Stock Option Activity for All Plans (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
Feb. 02, 2019	Jan. 28, 2017
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Outstanding Stock Options, Beginning balance	544,000
Outstanding Stock Options, Granted	484,000	0
Outstanding Stock Options, Forfeited	(589,000)
Outstanding Stock Options, Ending balance	439,000
Outstanding Stock Options, Exercisable	105,000
Weighted Average Exercise Price, Beginning balance	$ 11.26
Weighted Average Exercise Price, Granted	3.07
Weighted Average Exercise Price, Forfeited	8.42
Weighted Average Exercise Price, Ending balance	6.06
Weighted Average Exercise Price, Exercisable	$ 12.90
Weighted Average Remaining Life, Outstanding	8 years 4 months 24 days
Weighted Average Remaining Life, Exercisable	6 years
Aggregate Intrinsic Value, Ending balance	$ 71

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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-Publisher FASB
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-Section 50
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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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Gross number of share options (or share units) granted during the period.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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