Balance Sheet Components (Schedule of Investments Classified as Available-for-Sale in Continuous Unrealized Loss Position) (Details) - USD ($)	Dec. 31, 2022	Dec. 31, 2021
Net Investment Income [Line Items]
Estimated Fair Market Value, Less Than 12 Months	$ 73,800,000
Gross Unrealized Losses, Less Than 12 Months	(320,000)
Estimated Fair Market Value, 12 Months or Longer	0
Gross Unrealized Losses, 12 Months or Longer	0
Estimated Fair Market Value, Total	73,800,000
Gross Unrealized Losses, Total	(320,000)	$ 0
U.S. Treasury Securities
Net Investment Income [Line Items]
Estimated Fair Market Value, Less Than 12 Months	73,800,000
Gross Unrealized Losses, Less Than 12 Months	(320,000)
Estimated Fair Market Value, 12 Months or Longer	0
Gross Unrealized Losses, 12 Months or Longer	0
Estimated Fair Market Value, Total	73,800,000
Gross Unrealized Losses, Total	$ (320,000)

Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

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