ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Fair Value Measurements (Details) - USD ($) $ in Thousands	Dec. 31, 2021		Dec. 31, 2020
Liabilities subject to fair value measurement:
Contingent consideration			$ 780
Employment agreement award	$ 28,193		25,603
Total	28,193		26,383
Mezzanine equity subject to fair value measurement:
Redeemable noncontrolling interests	17,015	[1]	12,701
Fair Value, Inputs, Level 3 [Member]
Liabilities subject to fair value measurement:
Contingent consideration			780
Employment agreement award	28,193		25,603
Total	28,193		26,383
Mezzanine equity subject to fair value measurement:
Redeemable noncontrolling interests	$ 17,015	[1]	$ 12,701

[1] The redeemable noncontrolling interest in Reach Media is measured at fair value using a discounted cash flow methodology. A third-party valuation firm assisted the Company in estimating the fair value. Significant inputs to the discounted cash flow analysis include forecasted operating results, discount rate and a terminal value.