Quarterly report pursuant to Section 13 or 15(d)

REVENUE - Concentration of Accounts Receivable (Details)

v3.22.1
REVENUE - Concentration of Accounts Receivable (Details) - Accounts Receivable - Revenue Stream Concentration Risk
3 Months Ended 12 Months Ended
Mar. 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 91.00% 91.00%
Facility billing    
Disaggregation of Revenue [Line Items]    
Concentration of accounts receivable 4.00% 2.00%
Managed service agreements    
Disaggregation of Revenue [Line Items]    
Concentration of accounts receivable 4.00% 3.00%
Other revenue    
Disaggregation of Revenue [Line Items]    
Concentration of accounts receivable 1.00% 4.00%