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STOCK-BASED COMPENSATION - Additional Information (Details) $ in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended | 11 Months Ended
--- | --- | --- | --- | ---
Apr. 30, 2018 person shares | Oct. 31, 2018 USD ($) shares | Oct. 31, 2017 USD ($) | Oct. 31, 2018 USD ($) shares | Oct. 31, 2017 USD ($) | Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |
Stock compensation expense |  | $ 300 | $ 1,300 | $ 1,244 | $ 3,573 |
Unrecognized compensation cost |  | 3,600 |  | 3,600 |  |
Intrinsic value of outstanding stock options |  | 7,100 |  | 7,100 |  |
Intrinsic value of exercisable stock options |  | $ 6,400 |  | $ 6,400 |  |
Stock Plan |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |
Number of shares of common stock available for award | shares |  | 675,500 |  | 675,500 |  |
Stock Options Plans |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |
Number of shares of common stock reserved for issuance | shares |  | 1,800,000 |  | 1,800,000 |  |
Compensation expense recognize, period |  |  |  | 3 years |  |
Intrinsic value of the stock options exercised |  |  |  | $ 100 | $ 3,100 |
Stock Options Plans | Stock Plan |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |
Period to become exercisable |  |  |  | 3 years |  | 1 year
ISOs | Stock Plan |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |
Incentive stock option award maximum expiration period |  |  |  | 10 years |  |
NSOs | Stock Plan |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |
Incentive stock option award maximum expiration period |  |  |  | 10 years |  |
Senior executives | Performance-based restricted stock units | Stock Plan |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |
Number of executives | person | 2 |  |  |  |  |
Period to become exercisable | 3 years |  |  |  |  |
Senior executives | Performance-based restricted stock units | Stock Plan | Maximum |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |
Number of shares awarded | shares | 36,000 |  |  |  |  |

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- Definition Aggregate number of common shares reserved for future issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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 (i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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