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BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES - Marketable Securities (Details) - USD ($) | 6 Months Ended |
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020
Accounting Policies [Abstract] |  |  |
Marketable securities | $ 0 |  | $ 0
Realized (gain) loss on marketable securities | $ 0 | $ 3,378,000 |

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- Definition Amount of investment in marketable security. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.4) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 + Details
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- Definition Amount of realized gain (loss) on investment in marketable security, including other-than-temporary impairment (OTTI). + References No definition available. + Details
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