DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Net Loss Per Share (Details) - shares			3 Months Ended		6 Months Ended
	Jul. 31, 2017	Jul. 31, 2016	Jul. 31, 2017	Jul. 31, 2016	Jul. 31, 2017	Jul. 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	57,142,000	10,002,000