Quarterly report pursuant to Section 13 or 15(d)

REVENUE - Concentration of Accounts Receivable (Details)

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REVENUE - Concentration of Accounts Receivable (Details) - Accounts Receivable - Revenue Stream Concentration Risk
3 Months Ended 12 Months Ended
Mar. 31, 2024
Dec. 31, 2023
Disaggregation of Revenue [Line Items]    
Concentration of accounts receivable 100.00% 100.00%
Commercial insurance    
Disaggregation of Revenue [Line Items]    
Concentration of accounts receivable 68.00% 82.00%
Facility billing    
Disaggregation of Revenue [Line Items]    
Concentration of accounts receivable 26.00% 18.00%
Other    
Disaggregation of Revenue [Line Items]    
Concentration of accounts receivable 6.00%