CONVERTIBLE REDEEMABLE PREFERRED STOCK AND STOCKHOLDERS' EQUITY - Common Stock (Details) - USD ($)				1 Months Ended								9 Months Ended		12 Months Ended
	Nov. 28, 2016	Aug. 17, 2016	Oct. 24, 2014	Jul. 31, 2017	Apr. 30, 2017	Dec. 31, 2016	Nov. 30, 2016	Sep. 30, 2016	Aug. 31, 2016	Apr. 30, 2016	Dec. 31, 2015	Oct. 31, 2017	Oct. 31, 2016	Jan. 31, 2017
Conversion of convertible notes payable to common stock (in shares)	1,926,711
Shares issued												82,233,938		67,719,577
Net proceeds from issuance of common stock, preferred stock and warrants												$ 6,355,000	$ 5,675,000
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%
Unsecured Convertible Notes Payable
Convertible notes payable, net		$ 500,000
Maturity term (in months)		6 months
Interest rate (as a percentage)		10.00%
Public Offering
Issuance of stock (in shares)										3,600,000
Share price (in dollars per share)										$ 1.195
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)							31,499,725			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
Percentage of securities offered								50.00%
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			$ 0.75
Warrants, exercise term								18 months
Over-Allotment Option
Net proceeds from the sale of common stock						$ 400,000
Shares issued						1,390,676
Korea Investment Partners
Shares issued			290,000
Stock vested			96,667
Stock not expected to vest			193,333
Korea Investment Partners | Subscription Agreement | Common Stock
Shares issued			1,081,081
Share price (in dollars per share)			$ 1.85
Revenue from Violet			$ 2,000,000
Subscription agreement receivable			$ 2,000,000
Korea Investment Partners | Subscription Agreement | Common Stock | Minimum
Share price (in dollars per share)			$ 3.70
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%