STOCK-BASED COMPENSATION - Stock option activity (Details) - shares shares in Thousands	9 Months Ended
Sep. 30, 2022	Sep. 30, 2021
Options
Option Shares
Outstanding at the beginning of the period (in shares)	747	756
Granted (in shares)	36	97
Exercised (in shares)	(16)	(5)
Forfeited (in shares)	(58)	(74)
Outstanding at the end of the period (in shares)	709	774
Inducement Grants
Option Shares
Outstanding at the beginning of the period (in shares)	241	180
Granted (in shares)		61
Outstanding at the end of the period (in shares)	241	241

The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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

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

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

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