Shareholders' Equity - Private Placement Securities Purchase Agreements (Details)		3 Months Ended
	Mar. 16, 2017 USD ($) $ / shares shares	Apr. 29, 2017 shares	Jan. 28, 2017 USD ($) investors $ / shares shares	Oct. 29, 2016 USD ($) $ / shares shares
Private Placement Securities Purchase Agreements [Line Items]
Proceeds from securities issuance | $				$ 10,000,000
Securities issuance costs | $				$ 852,000
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%
Option Warrants exercise period				5 years
Limitation on size of offering, percent of common stock				19.99%
Common Stock [Member]
Private Placement Securities Purchase Agreements [Line Items]
Shares sold		100,000		5,952,381
Price per share of common stock | $ / shares				$ 1.68
Warrant [Member]
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
Fourth Quarter Fiscal 2016 Option Exercise [Member]
Private Placement Securities Purchase Agreements [Line Items]
Proceeds from securities issuance | $			$ 2,500,000
Securities issuance costs | $			$ 49,000
Option Exercises, Number of Investors | investors			3
Fourth Quarter Fiscal 2016 Option Exercise [Member] | Common Stock [Member]
Private Placement Securities Purchase Agreements [Line Items]
Shares sold			1,646,350
Fourth Quarter Fiscal 2016 Option Exercise [Member] | Warrant [Member]
Private Placement Securities Purchase Agreements [Line Items]
Shares sold			823,175
Warrant exercise period			5 years
Amended and Restated Option [Member]
Private Placement Securities Purchase Agreements [Line Items]
Securities issuance costs | $	$ 23,000
Maximum [Member]
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]
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]
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]
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]
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]
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]
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]
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]
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]
Private Placement Securities Purchase Agreements [Line Items]
Option expiration date	Sep. 16, 2017