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Organization and Summary of Accounting Policies - Medicare Accelerated Payments and Deferred Governmental Grants (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Grant funds	$ 0	$ 500,000	$ 1,100,000	$ 1,800,000
Unrecognized grant funds received	0		0		$ 3,000,000
Current deferred accrued payroll and benefits	$ 0		$ 0		$ 0
Repayments of grants received		$ 13,000,000		$ 56,000,000