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FAIR VALUE MEASUREMENTS - Unrealized Gain Position (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Fair Value Disclosures [Abstract] |  |
Fair value of marketable equity securities, carrying amount | $ 0 | $ 10,582,000
Fair value of marketable securities, less then 12 months | 0 | 10,582,000
Fair value of marketable securities, 12 months or greater | 0 | 0
Fair value of marketable securities, total | 0 | 10,582,000
Unrealized gains, carrying amount | 0 | 0
Unrealized gains, less than 12 months | 0 | 3,043,000
Unrealized gains, 12 months or greater | 0 | 0
Unrealized gains, total | $ 0 | $ 3,043,000

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- Definition Equity Securities, FV-NI, Available-For-Sale, Continuous Unrealized Gain Position, 12 Months Or Longer + References No definition available. + Details
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- Definition Equity Securities, FV-NI, Available-For-Sale, Continuous Unrealized Gain Position, 12 Months Or Longer, Accumulated Gain + References No definition available. + Details
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- Definition Equity Securities, FV-NI, Available-For-Sale, Continuous Unrealized Gain Position, Accumulated Gain + References No definition available. + Details
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- Definition Equity Securities, FV-NI, Available-For-Sale, Continuous Unrealized Gain Position, Less Than 12 Months + References No definition available. + Details
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- Definition Equity Securities, FV-NI, Available-For-Sale, Continuous Unrealized Gain Position, Less Than 12 Months, Accumulated Gain + References No definition available. + Details
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- Definition Amount of unrealized gain on investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 321 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=120269885&loc=SL75117546-209714 + Details
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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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