CONVERTIBLE REDEEMABLE PREFERRED STOCK AND STOCKHOLDERS' EQUITY - Common Stock (Details) - USD ($)			1 Months Ended										12 Months Ended
	Nov. 28, 2016	Aug. 17, 2016	Nov. 30, 2017	Jul. 31, 2017	Apr. 30, 2017	Dec. 31, 2016	Nov. 30, 2016	Sep. 30, 2016	Aug. 31, 2016	Apr. 30, 2016	Dec. 31, 2015	Jun. 30, 2015	Jan. 31, 2018	Jan. 31, 2017
Conversion of convertible notes to common stock (in shares)	1,926,711
Shares issued													160,062,509	67,719,577
Net proceeds from issuance of common stock, preferred stock and warrants													$ 16,049,000	$ 16,712,000
Beneficial ownership interest if common stock issued (as a percentage)			9.99%
Conversion price (in dollars per share)		$ 0.80
Beneficial conversion feature														$ 88,000
Debt issuance costs		$ 16,000
Secured Convertible Notes Payable
Convertible notes payable, net		$ 1,000,000
Maturity term (in months)		36 months
Interest rate (as a percentage)		10.00%
Minimum
Beneficial ownership interest if common stock issued (as a percentage)			4.99%
Common Stock
Issuance of stock (in shares)			45,275,000										57,185,258	40,453,182
Conversion of convertible notes to common stock (in shares)														1,926,711
Warrant
Net proceeds from issuance of common stock and warrants			$ 9,700,000
Secured Convertible Notes Payable
Conversion of convertible notes to common stock (in shares)												182,266
Unsecured Convertible Notes Payable
Convertible notes payable, net		$ 500,000
Maturity term (in months)		6 months
Interest rate (as a percentage)		10.00%
Series A Convertible Preferred Stock
Issuance of stock (in shares)														1,515
Prefunded warrants
Warrants exercise price (in dollars per share)			$ 0.001
Prefunded warrants | Warrant
Number of shares of common stock subject to warrant (in shares)			28,225,000
Series A Warrants | Warrant
Number of shares of common stock subject to warrant (in shares)			73,500,000
Warrants exercise price (in dollars per share)			$ 0.20
Warrants, expiration term			5 years
Series B Warrants | Warrant
Number of shares of common stock subject to warrant (in shares)			73,500,000
Warrants exercise price (in dollars per share)			$ 0.25
Warrants exercisable after number of trading days from a press release			20 days
Warrants exercisable after number of months from issuance			18 months
Prefunded warrants and series A | Common Stock
Number of common shares called by each warrant (in shares)			1
Prefunded warrants and series B | Common Stock
Number of common shares called by each warrant (in shares)			1
Prefunded warrants, series A and series B | Warrant
Warrants exercise price (in dollars per share)			$ 0.1490
Series A and series B | Common Stock
Warrants exercise price (in dollars per share)			$ 0.15
Public Offering
Issuance of stock (in shares)										3,600,000		3,636,384
Net proceeds from the sale of common stock												$ 7,800,000
Share price (in dollars per share)										$ 1.195
Issuance of warrants							31,499,725
Net proceeds from issuance of common stock and warrants										$ 3,600,000
Net proceeds from issuance of common stock, preferred stock and warrants							$ 10,600,000
Number of shares of common stock subject to warrant (in shares)										1,952,000
Warrants exercise price (in dollars per share)										$ 1.20
Public Offering | Common Stock
Issuance of stock (in shares)							31,489,429
Share price (in dollars per share)							$ 0.35
Public Offering | Preferred Stock
Issuance of stock (in shares)							1,515
Public Offering | Warrant
Number of shares of common stock subject to warrant (in shares)							3,246,429
Warrants exercise price (in dollars per share)							$ 0.35
Public Offering | Series A Convertible Preferred Stock
Share price (in dollars per share)							$ 1,000
Private Placement
Issuance of stock (in shares)				5,500,000	6,410,258			1,550,000	2,423,077
Net proceeds from the sale of common stock				$ 1,900,000	$ 4,400,000			$ 800,000	$ 1,300,000
Share price (in dollars per share)				$ 0.36	$ 0.78			$ 0.60	$ 0.65
Number of shares of common stock subject to warrant (in shares)					3,365,385			1,286,501
Warrants exercise price (in dollars per share)					$ 0.90			$ 0.80
Warrants, expiration term								5 years
Over-Allotment Option
Net proceeds from the sale of common stock						$ 400,000
Shares issued						1,390,676
Franklin Advisers | Private Placement
Issuance of stock (in shares)											4,100,000
Net proceeds from the sale of common stock											$ 5,500,000
Share price (in dollars per share)											$ 1.43
Period within which securities can be purchased											5 years
Franklin Advisers | Private Placement | Maximum
Percentage of securities offered											20.00%