INCOME TAXES - Components of Deferred Tax Assets (Details) - USD ($) $ in Thousands	Jan. 31, 2018	Jan. 31, 2017
Deferred tax assets:
Net operating loss carryforwards	$ 14,314	$ 15,618
Stock-based compensation expense	831	908
Tax credit carryforwards	735	576
Other	377	194
Total deferred tax assets	16,257	17,296
Less: Valuation allowance	(16,257)	(17,296)
Net deferred tax assets