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LEASES - As Lessee - Ground Lease and Office Lease (Details) | 3 Months Ended | 6 Months Ended
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Jun. 30, 2021 USD ($) item | Jun. 30, 2020 USD ($) | Jun. 30, 2021 USD ($) item | Jun. 30, 2020 USD ($)
Real Estate in Greensboro, NC |  |  |  |
Lessee Accounting |  |  |  |
Operating lease, option to extend |  |  | true |
Operating lease, remaining lease term | 13 years 8 months 12 days |  | 13 years 8 months 12 days |
Real Estate in Greensboro, NC | Real estate expenses |  |  |  |
Lessee Accounting |  |  |  |
Operating lease expense | $ | $ 150,000 | $ 131,000 | $ 300,000 | $ 262,000
Real Estate in Greensboro, NC | Five-Year Lease |  |  |  |
Lessee Accounting |  |  |  |
Operating lease, renewal term | 5 years |  | 5 years |
Real Estate in Greensboro, NC | Five-Year Lease | Maximum |  |  |  |
Lessee Accounting |  |  |  |
Operating lease, number of renewal options | item | 4 |  | 4 |
Real Estate in Greensboro, NC | Seven-Month Lease |  |  |  |
Lessee Accounting |  |  |  |
Operating lease, number of renewal options | item | 1 |  | 1 |
Operating lease, renewal term | 7 months |  | 7 months |
Corporate office lease in Great Neck, NY |  |  |  |
Lessee Accounting |  |  |  |
Operating lease, option to extend |  |  | true |
Operating lease, remaining lease term | 15 years 6 months |  | 15 years 6 months |
Corporate office lease in Great Neck, NY | General and administrative expense |  |  |  |
Lessee Accounting |  |  |  |
Operating lease expense | $ | $ 14,000 | $ 14,000 | $ 28,000 | $ 28,000
Corporate office lease in Great Neck, NY | Five-Year Lease |  |  |  |
Lessee Accounting |  |  |  |
Operating lease, renewal term | 5 years |  | 5 years |

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- Definition The number of renewal options available to the Company, as defined in the lease agreement. + References No definition available. + 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 Indicates (true false) whether lessee has option to extend operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918673-209980 + Details
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- Definition Remaining lease term of operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918673-209980 + Details
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- Definition Term of lessee's operating lease renewal, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918673-209980 + Details
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- Definition Amount of operating lease expense. Excludes sublease income. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121603541&loc=SL77918638-209977 + Details
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