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STOCK-BASED COMPENSATION - Additional Information (Details) $ in Thousands | 3 Months Ended | 9 Months Ended | 11 Months Ended
--- | --- | --- | ---
Oct. 31, 2019 USD ($) shares | Apr. 30, 2019 person shares | Oct. 31, 2018 USD ($) | Apr. 30, 2018 person shares | Oct. 31, 2019 USD ($) shares | Oct. 31, 2018 USD ($) | Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |
Period to become exercisable |  |  |  |  | 3 years |  |
Percentage reduction in the aggregate fair value of stock option |  |  |  |  | 88.50% |  |
Stock compensation expense | $ 600 |  | $ 300 |  | $ 1,512 | $ 1,244 |
Unrecognized compensation cost | 3,100 |  |  |  | 3,100 |  |
Intrinsic value of outstanding stock options | $ 3,000 |  |  |  | $ 3,000 |  |
Stock Plan |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |
Number of shares of common stock available for award | shares | 443,500 |  |  |  | 443,500 |  |
Stock Options Plans |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |
Number of shares of common stock reserved for issuance | shares | 1,700,000 |  |  |  | 1,700,000 |  |
Compensation expense recognize, period |  |  |  |  | 3 years |  |
Intrinsic value of the stock options exercised |  |  |  |  | $ 1,400 | $ 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 |  |  |  |  |  |  |
Period to become exercisable |  | 3 years |  | 3 years |  |  |
Number of executives | person |  | 2 |  | 2 |  |  |
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 |  | 36,000 |  |  |

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