Shareholders' Equity - Registered Direct Offering and Private Placement Securities Purchase Agreements (Details) $ / shares in Units, $ in Thousands			3 Months Ended		9 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	Oct. 28, 2017 USD ($) shares	Oct. 29, 2016 USD ($) $ / 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				$ 4,628	$ 10,000
Securities issuance costs | $	$ 323			$ 852
Proceeds from securities issuance | $				$ 10,000
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%		66.60%
Portion of Option securities issued in the form of warrants upon exercise				33.30%		33.30%
Option Warrants exercise price premium, percentage				50.00%
Option Warrants exercise period				5 years
Limitation on size of offering, percent of common stock				19.99%		19.99%
Common Stock [Member]
Registered Direct Offering and Private Placement Securities Purchase Agreements [Line Items]
Shares sold				5,952,381	4,108,273
Price per share of common stock | $ / shares				$ 1.68		$ 1.68
Warrant [Member]
Registered Direct Offering and Private Placement Securities Purchase Agreements [Line Items]
Shares sold				2,976,190
Warrant exercise period				5 years
Warrant exercise price per share | $ / shares				$ 2.90		$ 2.90
Fourth Quarter Fiscal 2016 Option Exercise [Member]
Registered Direct Offering and Private Placement Securities Purchase Agreements [Line Items]
Securities issuance costs | $			$ 49
Proceeds from securities issuance | $			$ 2,500
Option Exercises, Number of Investors | investors			3
Fourth Quarter Fiscal 2016 Option Exercise [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 Exercise [Member] | Warrant [Member]
Registered Direct Offering and Private Placement Securities Purchase Agreements [Line Items]
Shares sold			823,175
Warrant exercise period			5 years
Amended and Restated Option [Member]
Registered Direct Offering and Private Placement Securities Purchase Agreements [Line Items]
Securities issuance costs | $		$ 23
Maximum [Member]
Registered Direct Offering and Private Placement Securities Purchase Agreements [Line Items]
Warrant, Dates from which warrants exercisable				Sep. 19, 2021
Option exercise period				6 months
Maximum [Member] | Fourth Quarter Fiscal 2016 Option Exercise [Member]
Registered Direct Offering and Private Placement Securities Purchase Agreements [Line Items]
Price per share of common stock | $ / shares			$ 1.94
Warrant exercise price per share | $ / shares			$ 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, Dates from which warrants exercisable				Mar. 19, 2017
Minimum [Member] | Fourth Quarter Fiscal 2016 Option Exercise [Member]
Registered Direct Offering and Private Placement Securities Purchase Agreements [Line Items]
Price per share of common stock | $ / shares			$ 1.20
Warrant exercise price per share | $ / shares			$ 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
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]
Warrant, Dates from which warrants 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