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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Feb. 29, 2020
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Apr. 30, 2020
Concentration Risk [Line Items]              
CARES Act grant             $ 11,700
Rebate receivable   $ 36,900   $ 36,900   $ 35,200  
Investments in equity-method investees   20,300   20,300   $ 17,000  
Proportionate share of earnings in equity-method investees   1,700 $ 800 4,567 $ 2,364    
Distributions received from the investees   $ 1,300 $ 2,300 $ 1,300 $ 2,800    
Revenue from Contract with Customer Benchmark | Company's Largest Payer              
Concentration Risk [Line Items]              
Concentration ​risk   16.00% 16.00% 16.00% 15.00%    
Contract term 2 years            
Revenue from Contract with Customer Benchmark | Governmental Healthcare Programs              
Concentration Risk [Line Items]              
Concentration ​risk   12.00% 12.00% 12.00% 12.00%    
Accounts Receivable | Governmental Healthcare Programs              
Concentration Risk [Line Items]              
Concentration ​risk       11.00%   15.00%  
Cost of Goods and Service, Product and Service Benchmark | Medical Supply Vendors              
Concentration Risk [Line Items]              
Concentration ​risk   65.00% 71.00% 65.00% 72.00%