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STOCKHOLDERS' EQUITY - Stock option activity (Details)	9 Months Ended
	Sep. 30, 2021 shares
Stock options
Equity Incentive Plans Stock Option Activity [Line Items]
Equity awards outstanding, beginning of year	2,526
Number of shares, Exercised/Vested	(53)
Number of shares, Expired/Forfeited	(6)
Equity awards outstanding, end of period	2,467
Unvested restricted stock
Equity Incentive Plans Stock Option Activity [Line Items]
Equity awards outstanding, beginning of year	10,785
Number of shares, Granted.	2,464
Number of shares, Exercised/Vested	(1,106)
Number of shares, Expired/Forfeited	(150)
Equity awards outstanding, end of period	11,993

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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

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