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CONVERTIBLE REDEEMABLE PREFERRED STOCK AND STOCKHOLDERS' EQUITY - Preferred Stock & Warrants (Details) - USD ($)		1 Months Ended		6 Months Ended
	Oct. 23, 2017	Nov. 30, 2016	Sep. 30, 2016	Jul. 31, 2018	Jan. 31, 2018	Jul. 31, 2017	Apr. 30, 2017
Equity
Series A convertible preferred stock, shares authorized				10,000,000	10,000,000
Series A convertible preferred stock, shares issued				0	0
Proceeds from exercises of common stock warrants				$ 6,961,000
Private placement
Equity
Share price (in dollars per share)						$ 0.36	$ 0.78
Warrants exercise price (in dollars per share)							$ 0.90
Number of shares of common stock subject to warrant (in shares)							3,365,385
Warrant \| Public Offering
Equity
Warrants exercise price (in dollars per share)		$ 0.35
Number of shares of common stock subject to warrant (in shares)		3,246,429
Warrants related to January 2014 agreement \| Warrant
Equity
Warrants exercise price (in dollars per share)				$ 1.85
Warrants outstanding				289,505
Warrants related to May 2014 agreement \| Warrant
Equity
Warrants exercise price (in dollars per share)				$ 2.035
Warrants outstanding				316,395
Warrants related to April to November 2014 financing \| Warrant
Equity
Warrants exercise price (in dollars per share)				$ 3.70
Warrants outstanding				1,661,055
Warrants related to June 2015 financing \| Warrant
Equity
Warrants exercise price (in dollars per share)				$ 2.75
Warrants outstanding				109,091
Warrants related to April 2016 financing \| Warrant
Equity
Warrants exercise price (in dollars per share)				$ 1.20
Warrants outstanding				1,952,000
Warrants related to September 2016 financing \| Warrant
Equity
Warrants exercise price (in dollars per share)			$ 0.75	$ 0.75
Warrant liability			$ 566,000	$ 82,000
Number of shares of common stock subject to warrant (in shares)			1,286,501
Warrants outstanding				1,286,501
Dividend rate			0.00%
Risk-free rate			1.10%
Contractual term			5 years
Expected volatility			95.80%
Warrants related to November 2016 financing \| Warrant
Equity
Warrants exercise price (in dollars per share)				$ 0.35
Warrants outstanding				30,406,061
Warrants related to November 2016 financing, tranche two \| Warrant
Equity
Warrants exercise price (in dollars per share)				$ 0.44
Warrants outstanding				895,450
Warrants related to November 2016 financing, tranche three \| Warrant
Equity
Warrants exercise price (in dollars per share)				$ 0.33
Warrants outstanding				198,214
Warrants related to April 2017 financing \| Warrant
Equity
Warrants exercise price (in dollars per share)				$ 0.90
Warrants outstanding				801,282
Warrants related to October 2017 financing \| Warrant
Equity
Warrants exercise price (in dollars per share)	$ 0.24			$ 0.30
Number of shares of common stock subject to warrant (in shares)	2,564,103
Warrants outstanding				3,846,152
Incremental fair value of warrants	$ 151,000
Dividend rate	0.00%
Risk-free rate	2.03%
Contractual term	5 years
Expected volatility	83.90%
Warrants related to November 2017 financing \| Warrant
Equity
Warrants exercise price (in dollars per share)				$ 0.20
Warrants outstanding				56,935,191
Warrants related to November 2017 financing, tranche two \| Warrant
Equity
Warrants exercise price (in dollars per share)				$ 0.25
Warrants outstanding				60,088,727
Common Stock \| Warrants related to October 2017 financing \| Warrant
Equity
Warrants exercise price (in dollars per share)	$ 0.30
Warrants outstanding	3,846,152
Series A Convertible Preferred Stock
Equity
Series A convertible preferred stock, shares authorized		10,000
Series A convertible preferred stock, shares issued		1,515
Deemed dividend related to the beneficial conversion feature		$ 100,000
Number of common shares into which a share is convertible					4,328,571
Series A Convertible Preferred Stock \| Public Offering
Equity
Share price (in dollars per share)		$ 1,000