BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Revenue Recognition (Details) - USD ($) $ in Thousands		1 Months Ended	3 Months Ended	12 Months Ended	36 Months Ended	48 Months Ended
	Mar. 11, 2019	Mar. 31, 2019	Jun. 30, 2019	Dec. 31, 2019	Dec. 31, 2022	Dec. 31, 2023	Jul. 01, 2023	Dec. 31, 2018	Dec. 31, 2016
Revenue Recognition [Line Items]
Deferred revenue				$ 34,253				$ 37,629
Period for which points earned by members are valid				1 year
IVC Joint Venture
Revenue Recognition [Line Items]
Proceeds for investment in newly formed joint venture	$ 101,000	$ 99,200	$ 101,000
IVC Joint Venture | Subsequent Event | Forecast
Revenue Recognition [Line Items]
Proceeds for investment in newly formed joint venture					$ 75,000	$ 75,000	$ 75,000
Equity method investment, ownership percentage					100.00%		100.00%
IVC Joint Venture | International Vitamin Corporation
Revenue Recognition [Line Items]
Ownership interest (percentage)		43.00%
Membership
Revenue Recognition [Line Items]
Deferred revenue									$ 24,400
Discounts redeemed by customers				$ 1,400