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, 2021
Dec. 31, 2020
Disaggregation of Revenue [Line Items]    
Concentration of accounts receivable 100.00% 100.00%
Commercial insurance    
Disaggregation of Revenue [Line Items]    
Concentration of accounts receivable 91.00% 91.00%
Facility billing    
Disaggregation of Revenue [Line Items]    
Concentration of accounts receivable 2.00% 1.00%
Managed service agreements    
Disaggregation of Revenue [Line Items]    
Concentration of accounts receivable 3.00% 8.00%
Other revenue    
Disaggregation of Revenue [Line Items]    
Concentration of accounts receivable 4.00%