STOCK-BASED COMPENSATION - Summary of Time-based Stock Options (Details) - Time-based stock options - USD ($) $ / shares in Units, shares in Thousands	6 Months Ended
Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Number of Shares Underlying Stock Options
Beginning outstanding balance (in shares)	242
Granted (in shares)	0
Exercised (in shares)	0
Canceled or expired (in shares)	(70)
Ending outstanding balance (in shares)	172
Number of shares underlying stock options, vested and expected to vest (in shares)	163
Number of shares underlying stock options, exercisable (in shares)	116
Weighted Average Exercise Price Per Share
Beginning outstanding balance (in dollars per share)	$ 8.04
Granted (in dollars per share)	0
Exercised (in dollars per share)	0
Canceled or expired (in dollars per share)	7.27
Ending outstanding balance (in dollars per share)	8.35
Weighted average exercise price, vested and expected to vest (in dollars per share)	4.62
Weighted average exercise price, exercisable (in dollars per share)	$ 8.50
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Weighted average remaining contractual life, outstanding	4 years 2 months 15 days	4 years 5 months 8 days
Weighted average remaining contractual life, vested and expected to vest	3 years 8 months 4 days
Weighted average remaining contractual life, exercisable	4 years 18 days
Aggregate intrinsic value, outstanding	$ 0		$ 0
Aggregate intrinsic value, vested and expected to vest	0
Aggregate intrinsic value, exercisable	$ 0

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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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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Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements.

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Net number of share options (or share units) granted during the period.

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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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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Number of fully vested and expected to vest options outstanding that can be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Weighted-average exercise price, at which grantee can acquire shares reserved for issuance, for fully vested and expected to vest options outstanding. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options of the plan that expired.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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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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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average remaining contractual term for fully vested and expected to vest options outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Number of share options (or share units) exercised during the current period.

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