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STOCK-BASED COMPENSATION - Summary of Restricted Stock Activity (Details) - $ / shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Number of Shares
Balance beginning of period (in shares)	531,942
Vested (in shares)	(113,312)
Forfeited (in shares)	0
Balance end of period (in shares)	414,080	531,942
Weighted Average Grant Date Fair Value
Balance beginning of period (in usd per share)	$ 11.54
Vested (in usd per share)	11.24
Forfeited (in usd per share)	0
Balance end of period (in usd per share)	$ 11.60	$ 11.54
Restricted Stock
Number of Shares
Balance beginning of period (in shares)	1,691,699
Granted (in shares)	1,010,802	853,994	593,705
Vested (in shares)	(314,048)
Forfeited (in shares)	(556,074)
Balance end of period (in shares)	1,832,379	1,691,699
Weighted Average Grant Date Fair Value
Balance beginning of period (in usd per share)	$ 20.24
Granted (in usd per share)	12.43
Vested (in usd per share)	19.60
Forfeited (in usd per share)	20.56
Balance end of period (in usd per share)	$ 16.06	$ 20.24

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- Definition

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

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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 that were terminated.

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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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