Carrying value wrote off warrant exercise.

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Debt instrument transaction cost

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Dividend yield.

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Expected holding period of equity method investment.

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Extended expiration date.

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The number of the Company's Board members currently serving on the Investee's Board.

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Percentage of estimated volatility.

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Risk free interest rate.

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The amount the Company agreed to pay for common stock and warrants upon satisfaction of certain closing conditions under the terms of the securities purchase agreement.

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The maximum number of additional common stock shares into which the warrants may be converted.

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Exercise price per share or per unit of warrants or rights outstanding.

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The number of shares issued in exchange for the original debt being converted in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or payments in the period.

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This item represents an other than temporary decline in value that has been recognized against an investment accounted for under the equity method of accounting. The excess of the carrying amount over the fair value of the investment represents the amount of the write down which is or was reflected in earnings. The written down value is a new cost basis with the adjusted value of the investment becoming its new carrying value subject to the equity accounting method. Evidence of a loss in value might include, but would not necessarily be limited to, absence of an ability to recover the carrying amount of the investment or inability of the investee to sustain an earnings capacity which would justify the carrying amount of the investment.

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI), classified as current.

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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).

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of cash outflow to acquire investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI), classified as investing activity.

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The number of shares issued or sold by the subsidiary or equity method investee per stock transaction.

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Equity and Long-term Investments and Fair Value Measurements - Equity Investment in InCarda (Details) $ / shares in Units, $ in Millions			3 Months Ended			6 Months Ended
	Jun. 15, 2022 USD ($) $ / shares shares	Mar. 09, 2022 USD ($)	Jun. 30, 2023 USD ($) Director	Jun. 30, 2022 USD ($)	Sep. 30, 2020 USD ($) shares	Jun. 30, 2023 USD ($) Director	Jun. 30, 2022 USD ($)	Dec. 31, 2022 USD ($)
Series C preferred stock
Equity Investment
Impairment of equity investments			$ 2.9
InCarda
Equity Investment
Number of Investee's Board members currently representing the Company \| Director			0			0
Unrealized gain loss from fair value changes in equity investments			$ 2.9	$ 9.6		$ 3.0	$ 9.0
Carrying value wrote off warrant exercise						$ 0.1
InCarda \| Consolidated Investees [Member]
Equity Investment
Equity investment ownership percentage			8.10%			8.10%		9.00%
InCarda \| Series C preferred stock and warrants
Equity Investment
Amount of securities purchase agreement					$ 15.8
InCarda \| Warrants
Equity Investment
Maximum number of additional shares into which warrants may be converted under the securities purchase agreement \| shares					5,117,358
Extended expiration date						Mar. 31, 2023
InCarda \| Convertible note and warrants
Equity Investment
Amount of securities purchase agreement		$ 0.7
InCarda \| Common stock
Equity Investment
Number of shares issued resulting from recapitalization of equity structure \| shares	4,093,886
InCarda \| Series A1 preferred stock
Equity Investment
Debt Conversion, Converted Instrument, Shares Issued \| shares	37,350
InCarda \| Series D 1 Preferred Stock
Equity Investment
Debt Conversion, Converted Instrument, Shares Issued \| shares	8,771,780
InCarda \| Series D 2 Preferred Stock
Equity Investment
Debt Conversion, Converted Instrument, Shares Issued \| shares	3,369,802
InCarda \| Series D1 Warrant
Equity Investment
Debt Conversion, Converted Instrument, Shares Issued \| shares	2,490,033
Exercise price of warrants \| $ / shares	$ 0.2
InCarda \| Series C preferred stock
Equity Investment
Number of shares issued resulting from recapitalization of equity structure \| shares					20,469,432
Debt Conversion, Converted Instrument, Shares Issued \| shares	5,117,358
Transaction cost					$ 0.8
Equity and long-term investments at fair value			$ 4.8			$ 4.8		$ 6.8
Impairment of equity investments				$ 9.0
Exercise price of warrants \| $ / shares	$ 0.73
InCarda \| Series D warrants
Equity Investment
Equity and long-term investments at fair value			0.2			0.2		0.6
InCarda \| Series D Preferred Stock
Equity Investment
Payments to acquire equity securities	$ 2.3
InCarda \| Series D1 Preferred Stock, Series D2 Preferred Stock and Common Stock
Equity Investment
Equity and long-term investments at fair value			$ 2.7			$ 2.7		$ 3.2
InCarda \| Significant Unobservable Inputs, Level 3 \| Backsolve Valuation
Equity Investment
Expected holding period			2 years	2 years
Risk free interest rate			4.90%	3.20%
Dividend yield			0.00%	0.00%
Estimated volatility			114.20%	122.00%