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FAIR VALUE MEASUREMENT - Nonmonetary transaction (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2020 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Exchange for accounts receivable | $ 1.6
Prepaid Expenses and Other Current Assets |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
common stock and related securities prepaid expenses | 3.4
Other Nonoperating Income (Expense) |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Unrealized gains/losses | $ 1.8

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- Definition Amount of unrealized gain (loss) 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 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(3)(d)) -URI http://asc.fasb.org/extlink&oid=120400993&loc=SL114874131-224263 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -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 traded restricted common stock, warrants and other privately traded securities issued in non monetary exchange for accounts receivable. + References No definition available. + Details
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