ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Loyalty Program Rollforward (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Movement in Deferred Revenue [Roll Forward]
Loyalty program deferred revenue, beginning balance	$ 4,487	$ 3,127
Loyalty points forfeited or expired	(3,987)	(3,249)
Loyalty points used	(9,809)	(9,385)
Loyalty points vested	11,676	12,771
Loyalty points unvested	1,925	1,223
Loyalty program deferred revenue, ending balance	$ 4,292	$ 4,487