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EMPLOYEE BENEFIT PLANS (Details) - USD ($)		12 Months Ended
	Jan. 01, 2018	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
United States
Defined Contribution Plan
Employer discretionary matching		$ 0	$ 0	$ 0
Employer contributions		700,000	700,000	700,000
United States | Maximum
Defined Contribution Plan
Employer contribution percentage (percent)	4.50%
U.K
Defined Contribution Plan
Employer discretionary matching		0	0	0
Employer contributions		$ 100,000	$ 100,000	$ 100,000
U.K | Maximum
Defined Contribution Plan
Employer contribution percentage (percent)		4.50%

X

- Definition

Amount of cost for defined contribution plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 70
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942

+ Details

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X

- Definition

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.

+ References

No definition available.

+ Details

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X

- Definition

Amount of discretionary contributions made by an employer to a defined contribution plan.

+ References

No definition available.

+ Details

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X

- Definition

Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan.

+ References

No definition available.

+ Details

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