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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% |  |

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- 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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- 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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- Definition Amount of discretionary contributions made by an employer to a defined contribution plan. + References No definition available. + Details
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- 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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- Details
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- Details
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