Summary of Significant Accounting Policies - Percentage of Patient Accounts Receivable by Payor (Details) - Customer concentration risk - Accounts Receivable	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020
Concentration Risk [Line Items]
Concentration risk percentage	100.00%	100.00%
Medicare
Concentration Risk [Line Items]
Concentration risk percentage	60.30%	55.30%
Medicaid
Concentration Risk [Line Items]
Concentration risk percentage	7.50%	9.20%
Managed Care, Commercial, and Other
Concentration Risk [Line Items]
Concentration risk percentage	32.20%	35.50%

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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