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STOCK-BASED COMPENSATION - Additional Information (Details) $ in Thousands	1 Months Ended	3 Months Ended		11 Months Ended
	Apr. 30, 2019 USD ($) person shares	Apr. 30, 2019 USD ($) shares	Apr. 30, 2018 USD ($) person shares	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		$ 413	$ 568
Unrecognized compensation cost	$ 5,200	5,200
Intrinsic value of outstanding stock options	8,700	8,700
Intrinsic value of exercisable stock options	$ 7,000	$ 7,000
Stock Plan
Share-based Compensation Arrangement by Share-based Payment Award
Number of shares of common stock available for award | shares	496,000	496,000
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	$ 0
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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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.

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Net number of non-option equity instruments granted to participants.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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