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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Dec. 31, 2022
Concentration Risk [Line Items]      
Rebate receivable $ 48,300   $ 53,400
Investments in equity-method investees 18,300   $ 19,400
Proportionate share of earnings in equity-method investees 1,437 $ 1,267  
Proceeds from Equity Method Investment, Distribution $ 2,500 $ 0  
Revenue from Contract with Customer Benchmark | Company's Largest Payer | Largest Payer      
Concentration Risk [Line Items]      
Concentration ​risk 14.00% 15.00%  
Revenue from Contract with Customer Benchmark | Governmental Healthcare Programs | Government Healthcare Programs      
Concentration Risk [Line Items]      
Concentration ​risk 12.00% 13.00%  
Accounts Receivable, Benchmark | Governmental Healthcare Programs | Government Healthcare Programs      
Concentration Risk [Line Items]      
Concentration ​risk 11.00%   13.00%
Cost of Goods and Service, Product and Service Benchmark | Medical Supply Vendors | Four Vendors      
Concentration Risk [Line Items]      
Concentration ​risk 72.00% 75.00%