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STOCK-BASED COMPENSATION - Additional Information (Details) $ in Thousands | 1 Months Ended | 3 Months Ended | 6 Months Ended | 11 Months Ended |
--- | --- | --- | --- | --- | ---
Apr. 30, 2018 person shares | Jul. 31, 2018 USD ($) shares | Jul. 31, 2017 USD ($) | Jul. 31, 2018 USD ($) shares | Jul. 31, 2017 USD ($) shares | Dec. 31, 2017 | Jun. 30, 2018 shares
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |
Stock compensation expense | $ |  | $ 300 | $ 1,200 | $ 906 | $ 2,315 |  |
Unrecognized compensation cost | $ |  | 3,000 |  | $ 3,000 |  |  |
Stock option exercised | shares |  |  |  | 1,000 | 80,000 |  |
Intrinsic value of outstanding stock options | $ |  | 4,200 |  | $ 4,200 |  |  |
Intrinsic value of exercisable stock options | $ |  | $ 4,100 |  | $ 4,100 |  |  |
Stock Plan |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |
Number of shares of common stock reserved for issuance | shares |  |  |  |  |  |  | 750,000
Number of shares of common stock available for award | shares |  |  |  |  |  |  | 770,500
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 | $ |  |  |  |  | $ 2,800 |  |
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 |  |  |  |  |  |
Number of executives | person | 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 | 36,000,000 |  |  |  |  |  |

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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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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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