DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Net Loss Per Share (Details) - shares			3 Months Ended		9 Months Ended
	Oct. 31, 2017	Oct. 31, 2016	Oct. 31, 2017	Oct. 31, 2016	Oct. 31, 2017	Oct. 31, 2016
Net Loss Per Share
Common stock shares expected to vest			193,333	193,333	193,333	193,333
Potentially dilutive securities excluded from computation of diluted loss per share	58,382,000	12,860,000