Annual report pursuant to Section 13 and 15(d)

REVENUE - Concentration of Accounts Receivable (Details)

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REVENUE - Concentration of Accounts Receivable (Details) - Accounts Receivable - Revenue Stream Concentration Risk
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Disaggregation of Revenue [Line Items]    
Concentration of accounts receivable 100.00% 100.00%
Commercial insurance    
Disaggregation of Revenue [Line Items]    
Concentration of accounts receivable 84.00% 91.00%
Facility billing    
Disaggregation of Revenue [Line Items]    
Concentration of accounts receivable 9.00% 2.00%
Other    
Disaggregation of Revenue [Line Items]    
Concentration of accounts receivable 7.00% 7.00%