Amount of income (loss) for proportionate share of equity method investee's income (loss).

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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Concentration Risk [Line Items]
Rebate receivable	$ 47,600		$ 43,000
Investments in equity-method investees	21,400		$ 20,100
Proportionate share of earnings in equity-method investees	$ 1,267	$ 1,205
Revenue from Contract with Customer Benchmark \| Company's Largest Payer
Concentration Risk [Line Items]
Concentration risk	15.00%	16.00%
Revenue from Contract with Customer Benchmark \| Governmental Healthcare Programs
Concentration Risk [Line Items]
Concentration risk	13.00%	13.00%
Accounts Receivable \| Governmental Healthcare Programs
Concentration Risk [Line Items]
Concentration risk	11.00%		11.00%
Cost of Goods and Service, Product and Service Benchmark \| Medical Supply Vendors
Concentration Risk [Line Items]
Concentration risk	75.00%	67.00%