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INVESTMENTS - Narrative (Details) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2021 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) investment | Apr. 30, 2021 USD ($)
Investments, Debt and Equity Securities [Abstract] |  |  |  |
Number of investments in an unrealized loss position | investment |  |  | 0 |
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |
Upward price adjustments |  | $ 4,200,000 | $ 1,800,000 |
Impairment of equity securities |  |  | (700,000) |
Investment | $ 84,100,000 | 84,100,000 | $ 29,400,000 |
Kardion, Inc. |  |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |
Investment |  |  |  | $ 35,900,000
Investment option to acquire |  |  |  | 5,700,000
Maximum additional option to acquire investment |  |  |  | 21,800,000
Investment after first milestone | 10,800,000 |  |  |
Maximum secured promissory note |  |  |  | 45,000,000
Secured promissory note | 0 | 0 |  |
Kardion, Inc. | Equity Securities |  |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |
Maximum additional required investment |  |  |  | $ 9,900,000
Other income, net |  |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |
Increase in non-marketable equity securities due to observable price changes | 8,000,000 | 8,000,000 |  |
Decrease in non-marketable equity securities due to observable price changes | $ 2,600,000 | $ 2,600,000 |  |

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- Definition Number of investments in debt securities measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in unrealized loss position, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 4 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=124269663&loc=SL82922888-210455 + Details
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