ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Loyalty Deferred Revenue (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2022	Dec. 31, 2021
Loyalty program
Loyalty deferred revenue, beginning balance	$ 4,292	$ 4,487
Loyalty points forfeited or expired	(941)	(3,987)
Loyalty points used	(2,422)	(9,809)
Loyalty points vested	2,190	11,676
Loyalty points unvested	1,055	1,925
Loyalty deferred revenue, ending balance	4,174	4,292
Deferred commissions	$ 3,103	$ 2,369