FAIR VALUE MEASUREMENTS (Estimated Fair Values of the Financial Assets and Liabilities not Measured at Fair Value on a Recurring Basis) (Details) - Recurring - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2023	Dec. 31, 2022
Balance
Financial Assets:
Cash equivalents:	$ 353,825	$ 312,321
Restricted cash	6,804	2,292
Financial Liabilities:
Deferred consideration for asset acquisition	55,501	53,636
Balance | Time deposits
Financial Assets:
Time deposits included in Short-term investments	60,431	60,336
Balance | Credit Facility 2021 | Revolving Credit Facility
Financial Liabilities:
Borrowings under the 2021 Credit Agreement	25,000	25,000
Balance | Money market funds
Financial Assets:
Cash equivalents:	154,147	312,321
Balance | Time deposits
Financial Assets:
Cash equivalents:	199,678
Estimated Fair Value
Financial Assets:
Cash equivalents:	353,825	312,321
Restricted cash	6,804	2,292
Financial Liabilities:
Deferred consideration for asset acquisition	55,501	53,636
Estimated Fair Value | Time deposits
Financial Assets:
Time deposits included in Short-term investments	60,431	60,336
Estimated Fair Value | Credit Facility 2021 | Revolving Credit Facility
Financial Liabilities:
Borrowings under the 2021 Credit Agreement	25,000	25,000
Estimated Fair Value | Money market funds
Financial Assets:
Cash equivalents:	154,147	312,321
Estimated Fair Value | Time deposits
Financial Assets:
Cash equivalents:	199,678
Estimated Fair Value | Level 1
Financial Assets:
Cash equivalents:	154,147	312,321
Restricted cash	6,804	2,292
Financial Liabilities:
Deferred consideration for asset acquisition	0	0
Estimated Fair Value | Level 1 | Time deposits
Financial Assets:
Time deposits included in Short-term investments	0	0
Estimated Fair Value | Level 1 | Credit Facility 2021 | Revolving Credit Facility
Financial Liabilities:
Borrowings under the 2021 Credit Agreement	0	0
Estimated Fair Value | Level 1 | Money market funds
Financial Assets:
Cash equivalents:	154,147	312,321
Estimated Fair Value | Level 1 | Time deposits
Financial Assets:
Cash equivalents:	0
Estimated Fair Value | Level 2
Financial Assets:
Cash equivalents:	199,678	0
Restricted cash	0	0
Financial Liabilities:
Deferred consideration for asset acquisition	55,501	53,636
Estimated Fair Value | Level 2 | Time deposits
Financial Assets:
Time deposits included in Short-term investments	60,431	60,336
Estimated Fair Value | Level 2 | Credit Facility 2021 | Revolving Credit Facility
Financial Liabilities:
Borrowings under the 2021 Credit Agreement	25,000	25,000
Estimated Fair Value | Level 2 | Money market funds
Financial Assets:
Cash equivalents:	0	0
Estimated Fair Value | Level 2 | Time deposits
Financial Assets:
Cash equivalents:	199,678
Estimated Fair Value | Level 3
Financial Assets:
Cash equivalents:	0	0
Restricted cash	0	0
Financial Liabilities:
Deferred consideration for asset acquisition	0	0
Estimated Fair Value | Level 3 | Time deposits
Financial Assets:
Time deposits included in Short-term investments	0	0
Estimated Fair Value | Level 3 | Credit Facility 2021 | Revolving Credit Facility
Financial Liabilities:
Borrowings under the 2021 Credit Agreement	0	0
Estimated Fair Value | Level 3 | Money market funds
Financial Assets:
Cash equivalents:	0	$ 0
Estimated Fair Value | Level 3 | Time deposits
Financial Assets:
Cash equivalents:	$ 0