STOCK-BASED COMPENSATION - SUMMARY OF RESTRICTED STOCK UNITS AND RESTRICTED STOCK AWARDS (Details) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended	12 Months Ended
Mar. 31, 2021 USD ($) $ / shares shares	Dec. 31, 2020 USD ($) $ / shares shares
Number of Restricted Stock Units / Awards
Beginning outstanding balance (in shares) \| shares	802
Ending outstanding balance (in shares) \| shares		802
Weighted Average Grant Date Fair Value
Beginning outstanding balance (in dollars per share) \| $ / shares	$ 6.98
Ending outstanding balance (in dollars per share) \| $ / shares		$ 6.98
RSUs outstanding
Number of Restricted Stock Units / Awards
Granted (in shares) \| shares	0
Released (in shares) \| shares	(227)
Forfeited (in shares) \| shares	(10)
Ending outstanding balance (in shares) \| shares	565
Weighted Average Grant Date Fair Value
Granted (in dollars per share) \| $ / shares	$ 0
Released (in dollars per share) \| $ / shares	7.49
Forfeited (in dollars per share) \| $ / shares	6.74
Ending outstanding balance (in dollars per share) \| $ / shares	$ 6.78
Weighted average remaining contractual life / recognition period, Outstanding	1 year 29 days	1 year
Aggregate intrinsic value, Outstanding \| $	$ 5,415	$ 9,057
RSAs outstanding
Number of Restricted Stock Units / Awards
Beginning outstanding balance (in shares) \| shares	130
Granted (in shares) \| shares	0
Released (in shares) \| shares	0
Forfeited (in shares) \| shares	0
Ending outstanding balance (in shares) \| shares	130	130
Weighted Average Grant Date Fair Value
Beginning outstanding balance (in dollars per share) \| $ / shares	$ 6.53
Granted (in dollars per share) \| $ / shares	0
Released (in dollars per share) \| $ / shares	0
Forfeited (in dollars per share) \| $ / shares	0
Ending outstanding balance (in dollars per share) \| $ / shares	$ 6.53	$ 6.53
Weighted average remaining contractual life / recognition period, Outstanding	2 months 12 days	5 months 12 days

The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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-Name Accounting Standards Codification
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-SubTopic 10
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-Subparagraph (c)(1)(iv)(3)
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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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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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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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Weighted average remaining contractual term for equity-based awards excluding options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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Intrinsic value of outstanding award under share-based payment arrangement. Excludes share and unit options.

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