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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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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.

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