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SHARE-BASED COMPENSATION - Plan (Details) - USD ($) $ in Thousands							3 Months Ended	9 Months Ended
	Sep. 23, 2021	Dec. 02, 2020	Aug. 10, 2020	Mar. 27, 2020	Aug. 02, 2019	Feb. 07, 2019	Jun. 30, 2020	Sep. 30, 2021
SHARE-BASED COMPENSATION
Number of shares may be issued to employees, directors, consultants and nonemployee service providers in the form of stock options, stock and stock appreciation rights								10,000,000.0
Number of shares available for grant								9,700,000
Stock options
SHARE-BASED COMPENSATION
Contractual life								10 years
Stock options | Senior management
SHARE-BASED COMPENSATION
Contractual life	10 years		10 years			10 years
Vesting percentage	10.00%		20.00%			12.50%
Restricted shares | Senior management
SHARE-BASED COMPENSATION
Restricted shares granted (in shares)					39,526	120,000
Grant date fair value					$ 496	$ 1,636
Vesting percentage					20.00%	14.30%
Restricted shares forfeited (in shares)							42,857
Restricted shares | Independent directors
SHARE-BASED COMPENSATION
Restricted shares granted (in shares)		2,022		1,903		2,936
Grant date fair value		$ 30		$ 18		$ 40

X

- Definition

Represents the aggregate fair value of grants made during the period on other than stock option plans.

+ References

No definition available.

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- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iv)(3)
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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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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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Number of shares authorized for issuance under share-based payment arrangement.

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- Definition

The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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Percentage of vesting of award under share-based payment arrangement.

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- Definition

Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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