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STOCK-BASED COMPENSATION - Summary of Change in Number of Non-Vested Options to Purchase Shares of Common Stock (Details) - $ / shares shares in Thousands	9 Months Ended
	Oct. 31, 2018	Oct. 31, 2017
STOCK-BASED COMPENSATION
Shares, Non-vested, Beginning balance	302	270
Shares, Granted	192	125
Shares, Vested	(125)	(105)
Shares, Forfeitures		(10)
Shares, Non-vested, Ending balance	369	280
Weighted Average Fair Value, Non-vested, Beginning balance	$ 13.55	$ 14.93
Weighted Average Fair Value, Granted	9.35	16.19
Weighted Average Fair Value, Vested	16.19	9.66
Weighted Average Fair Value, Forfeitures		19.14
Weighted Average Fair Value, Non-vested, Ending balance	$ 10.47	$ 17.83

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Gross number of share options (or share units) granted during the period.

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- Definition

The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (d)(1)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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Number of non-vested options outstanding.

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Number of non-vested options forfeited.

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Weighted average grant-date fair value of non-vested options forfeited.

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Weighted average grant-date fair value of non-vested options outstanding.

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Number of options vested.

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Weighted average grant-date fair value of options vested.

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