Shareholders' Equity - Registered Direct Offering and Private Placement Securities Purchase Agreement (Details)			3 Months Ended		12 Months Ended
	May 30, 2017 USD ($) $ / shares shares	Mar. 16, 2017 USD ($) $ / shares shares	Jan. 28, 2017 USD ($) investors $ / shares shares	Oct. 29, 2016 USD ($) $ / shares shares	Feb. 02, 2019 USD ($)	Feb. 03, 2018 USD ($) shares	Jan. 28, 2017 USD ($) $ / shares shares
Registered Direct Offering and Private Placement Securities Purchase Agreements [Line Items]
Shares sold	4,008,273
Price per share of common stock | $ / shares	$ 1.12
Proceeds from issuance of common stock | $	$ 4,500,000				$ 0	$ 4,628,000	$ 12,470,000
Securities issuance costs | $	$ 323,000			$ 852,000
Warrant exercise period				5 years
Proceeds from securities issuance | $				$ 10,000,000
Option indexed to issuers equity, strike price, number of days used for volume weighted average price per share				5 days
Portion of option securities issued in the form of common stock upon exercise				66.60%
Portion of option securities issued in the form of warrants upon exercise				33.30%
Option Warrants exercise price premium, percentage				50.00%
Limitation on size of offering, percent of common stock				19.99%
Common Stock [Member]
Registered Direct Offering and Private Placement Securities Purchase Agreements [Line Items]
Shares sold				5,952,381		4,108,273	7,598,731
Price per share of common stock | $ / shares				$ 1.68
Warrant [Member]
Registered Direct Offering and Private Placement Securities Purchase Agreements [Line Items]
Shares sold				2,976,190
Warrant exercise price per share | $ / shares				$ 2.90
Fourth Quarter Fiscal 2016 Option Exercises [Member]
Registered Direct Offering and Private Placement Securities Purchase Agreements [Line Items]
Securities issuance costs | $			$ 49,000
Proceeds from securities issuance | $			$ 2,500,000
Option Exercises, Number of Investors | investors			3
Fourth Quarter Fiscal 2016 Option Exercises [Member] | Common Stock [Member]
Registered Direct Offering and Private Placement Securities Purchase Agreements [Line Items]
Shares sold			1,646,350
Fourth Quarter Fiscal 2016 Option Exercises [Member] | Warrant [Member]
Registered Direct Offering and Private Placement Securities Purchase Agreements [Line Items]
Shares sold			823,175
Warrant exercise period			5 years	5 years
Amended and Restated Option [Member]
Registered Direct Offering and Private Placement Securities Purchase Agreements [Line Items]
Securities issuance costs | $		$ 23,000
Maximum [Member]
Registered Direct Offering and Private Placement Securities Purchase Agreements [Line Items]
Warrant exercise period					7 years
Option exercise period				6 months
Class of Warrant or Right, Date of Expiration of Warrants or Rights Exercisable				Sep. 19, 2021
Maximum [Member] | Fourth Quarter Fiscal 2016 Option Exercises [Member]
Registered Direct Offering and Private Placement Securities Purchase Agreements [Line Items]
Price per share of common stock | $ / shares			$ 1.94				$ 1.94
Warrant exercise price per share | $ / shares			$ 3.00				3.00
Class of Warrant or Right, Date of Expiration of Warrants or Rights Exercisable			Jan. 23, 2022
Minimum [Member]
Registered Direct Offering and Private Placement Securities Purchase Agreements [Line Items]
Warrant exercise period					5 years
Warrants, Dates from which warrants exercisable				Mar. 19, 2017
Minimum [Member] | Fourth Quarter Fiscal 2016 Option Exercises [Member]
Registered Direct Offering and Private Placement Securities Purchase Agreements [Line Items]
Price per share of common stock | $ / shares			$ 1.20				1.20
Warrant exercise price per share | $ / shares			$ 1.76				$ 1.76
Class of Warrant or Right, Date of Expiration of Warrants or Rights Exercisable			Nov. 10, 2021
Tranche 1 [Member] | Amended and Restated Option [Member]
Registered Direct Offering and Private Placement Securities Purchase Agreements [Line Items]
Total shares of common stock purchasable		150,000
Aggregate proceeds | $		$ 133,000
Option Warrants exercise period		5 years
Tranche 1 [Member] | Amended and Restated Option [Member] | Common Stock [Member]
Registered Direct Offering and Private Placement Securities Purchase Agreements [Line Items]
Shares sold		100,000
Price per share of common stock | $ / shares		$ 1.33
Tranche 1 [Member] | Amended and Restated Option [Member] | Warrant [Member]
Registered Direct Offering and Private Placement Securities Purchase Agreements [Line Items]
Shares sold		50,000
Warrant exercise price per share | $ / shares		$ 1.92
Tranche 1 [Member] | Maximum [Member] | Amended and Restated Option [Member]
Registered Direct Offering and Private Placement Securities Purchase Agreements [Line Items]
Class of Warrant or Right, Date of Expiration of Warrants or Rights Exercisable		Mar. 16, 2022
Option expiration date		Mar. 16, 2017
Tranche 2 [Member] | Amended and Restated Option [Member]
Registered Direct Offering and Private Placement Securities Purchase Agreements [Line Items]
Total shares of common stock purchasable		1,073,945
Common shares issuable		715,963
Number of common shares purchasable by warrant		357,982
Tranche 2 [Member] | Maximum [Member] | Amended and Restated Option [Member]
Registered Direct Offering and Private Placement Securities Purchase Agreements [Line Items]
Option expiration date		Sep. 19, 2017
Directors and Executive Officers [Member]
Registered Direct Offering and Private Placement Securities Purchase Agreements [Line Items]
Price per share of common stock | $ / shares	$ 1.15