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EMPLOYEE BENEFIT PLANS - 401(k) Plan (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
EMPLOYEE BENEFIT PLANS |  |  |
Defined Contribution Plan, Employer Discretionary Contribution Amount | $ 642 | $ 507 | $ 285
Defined Contribution Plan, Tax Status | us-gaap:QualifiedPlanMember | us-gaap:QualifiedPlanMember | us-gaap:QualifiedPlanMember

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- References No definition available. + Details
Name: | us-gaap_CompensationAndRetirementDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of discretionary contributions made by an employer to a defined contribution plan. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Indicates tax status of defined contribution plan designed to provide retirement benefits. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanTaxStatusExtensibleList
Namespace Prefix: | us-gaap_
Data Type: | srt-types:extensibleListItemType
Balance Type: | na
Period Type: | instant