INCOME TAXES - Reconciliation of Income Tax Provision (Details) - USD ($) $ in Thousands	12 Months Ended
Jan. 31, 2017	Jan. 31, 2016
INCOME TAXES
Federal statutory rate	34.00%	34.00%
Reconciliation of income taxes:
Income tax benefit computed at U.S. statutory rate	$ (6,258)	$ (5,302)
State income tax (net of federal benefit)	(1,196)	(838)
Research and development credits	(125)	(128)
Change in valuation allowance	7,342	5,904
Other	239	368
Income tax provision	$ 2	$ 4

Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to increase (decrease) in the valuation allowance for deferred tax assets.

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The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations.

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