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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 | 12 Months Ended
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Jan. 31, 2019 | Jan. 31, 2018 | Jan. 31, 2017
STOCK-BASED COMPENSATION |  |  |
Shares, Non-vested, Beginning balance | 302 | 270 | 300
Shares, Granted | 257 | 302 | 270
Shares, Vested | (184) | (260) | (300)
Shares, Forfeitures |  | (10) |
Shares, Non-vested, Ending balance | 375 | 302 | 270
Weighted Average Fair Value, Non-vested, Beginning balance | $ 13.55 | $ 14.93 | $ 8.97
Weighted Average Fair Value, Granted | 9.31 | 13.55 | 14.93
Weighted Average Fair Value, Vested | 14.75 | 15.31 | 8.97
Weighted Average Fair Value, Forfeitures |  | 19.14 |
Weighted Average Fair Value, Non-vested, Ending balance | $ 10.05 | $ 13.55 | $ 14.93

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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 + Details
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