SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Patient Accounts Receivable Narrative (Details)	9 Months Ended
Sep. 30, 2023	Dec. 31, 2022
Concentration Risk [Line Items]
Accounts receivable derived from Medicare	65.00%	67.00%
Net service revenue period of care payment rate (days)	30 days
Percentage of patient receivables outstanding	10.00%
Historical collection rate from Medicare	99.00%
Payor Concentration Risk \| Accounts Receivable \| Single Payor
Concentration Risk [Line Items]
Concentration risk (percent)	14.00%

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
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