FAIR VALUE MEASUREMENTS - Schedule of Fair Value of Financial Assets and Liabilities (Details) - USD ($)	Sep. 30, 2023	Dec. 31, 2022
Fair Value, Measurements, Recurring
Assets:
Fair value of other non-current assets	$ 27,902,000	$ 22,296,000
Fair value of financial assets, Total	29,738,000	24,950,000
Liabilities:
Fair value of other current liabilities		18,579,000
Fair value of financial liabilities, Total	27,377,000	38,446,000
Fair Value, Measurements, Recurring | NQDC Plan liability
Liabilities:
Fair value of other current liabilities	1,836,000	2,654,000
Fair value of other non-current liabilities	25,541,000	19,867,000
Fair Value, Measurements, Recurring | Contingent consideration
Liabilities:
Fair value of other current liabilities		15,925,000
Fair Value, Measurements, Recurring | NQDC Plan assets
Assets:
Fair value of other current assets	1,836,000	2,654,000
Fair value of other non-current assets	25,541,000	19,867,000
Fair Value, Measurements, Recurring | Restricted Investments
Assets:
Fair value of other non-current assets	2,361,000	2,429,000
Quoted Price in Active Markets For Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial assets remeasured	0	0
Liabilities remeasured	0	0
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring
Assets:
Fair value of other non-current assets	27,902,000	22,296,000
Fair value of financial assets, Total	29,738,000	24,950,000
Liabilities:
Fair value of other current liabilities		2,654,000
Fair value of financial liabilities, Total	27,377,000	22,521,000
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring | NQDC Plan liability
Liabilities:
Fair value of other current liabilities	1,836,000	2,654,000
Fair value of other non-current liabilities	25,541,000	19,867,000
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring | Contingent consideration
Liabilities:
Fair value of other current liabilities		0
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring | NQDC Plan assets
Assets:
Fair value of other current assets	1,836,000	2,654,000
Fair value of other non-current assets	25,541,000	19,867,000
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring | Restricted Investments
Assets:
Fair value of other non-current assets	2,361,000	2,429,000
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring
Assets:
Fair value of other non-current assets	0	0
Fair value of financial assets, Total	0	0
Liabilities:
Fair value of other current liabilities		15,925,000
Fair value of financial liabilities, Total	0	15,925,000
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | NQDC Plan liability
Liabilities:
Fair value of other current liabilities	0	0
Fair value of other non-current liabilities	0	0
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Contingent consideration
Liabilities:
Fair value of other current liabilities		15,925,000
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | NQDC Plan assets
Assets:
Fair value of other current assets	0	0
Fair value of other non-current assets	0	0
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Restricted Investments
Assets:
Fair value of other non-current assets	$ 0	$ 0