CASH, CASH EQUIVALENTS AND SHORT-TERM INVESTMENTS - Cash and Cash Equivalents and Short-Term Investments (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Debt Securities, Available-for-Sale [Line Items]
Cash and cash equivalents	$ 243,805	$ 208,802
AFS Securities
Adjusted cost basis	146,601
Unrealized gains	8
Unrealized losses	(904)
Debt securities, fair market value and recorded basis	145,705
HTM Securities
Debt securities, held-to-maturity, Adjusted cost basis and Recorded basis	334,655	304,804
Unrealized gains	0	8
Unrealized losses	(757)	0
Fair market value	333,898	304,812
Debt securities, available-for-sale and held-to-maturity, Adjusted cost basis	971,216	937,700
Debt securities, available-for-sale and held-to-maturity, Unrealized gains	8	8
Debt securities, available-for-sale and held-to-maturity, Unrealized losses	(1,661)	0
Debt securities, available-for-sale and held-to-maturity, fair value	969,563	937,708
Debt securities, available-for-sale and held-to-maturity	970,320	937,700
Cash and Cash Equivalents
AFS Securities
Debt securities, fair market value and recorded basis	503
HTM Securities
Debt securities, held-to-maturity, Adjusted cost basis and Recorded basis	14,932
Debt securities, available-for-sale and held-to-maturity	243,805	208,802
Short-Term Investments
AFS Securities
Debt securities, fair market value and recorded basis	145,202
HTM Securities
Debt securities, held-to-maturity, Adjusted cost basis and Recorded basis	319,723	304,804
Debt securities, available-for-sale and held-to-maturity	726,515	728,898
Level 1 | U.S. Treasury bills
AFS Securities
Adjusted cost basis	487
Unrealized gains	0
Unrealized losses	(4)
Debt securities, fair market value and recorded basis	483
HTM Securities
Debt securities, held-to-maturity, Adjusted cost basis and Recorded basis	147,936
Unrealized gains	0
Unrealized losses	(279)
Fair market value	147,657
Level 1 | U.S. Treasury bills | Short-Term Investments
AFS Securities
Debt securities, fair market value and recorded basis	483
HTM Securities
Debt securities, held-to-maturity, Adjusted cost basis and Recorded basis	147,936
Level 2 | U.S. Treasury bills
HTM Securities
Debt securities, held-to-maturity, Adjusted cost basis and Recorded basis		199,981
Unrealized gains		8
Unrealized losses		0
Fair market value		199,989
Level 2 | U.S. Treasury bills | Short-Term Investments
HTM Securities
Debt securities, held-to-maturity, Adjusted cost basis and Recorded basis		199,981
Level 2 | Government and governmental agencies
AFS Securities
Adjusted cost basis	8,264
Unrealized gains	0
Unrealized losses	(48)
Debt securities, fair market value and recorded basis	8,216
HTM Securities
Debt securities, held-to-maturity, Adjusted cost basis and Recorded basis	34,582
Unrealized gains	0
Unrealized losses	(14)
Fair market value	34,568
Level 2 | Government and governmental agencies | Cash and Cash Equivalents
AFS Securities
Debt securities, fair market value and recorded basis	503
HTM Securities
Debt securities, held-to-maturity, Adjusted cost basis and Recorded basis	0
Level 2 | Government and governmental agencies | Short-Term Investments
AFS Securities
Debt securities, fair market value and recorded basis	7,713
HTM Securities
Debt securities, held-to-maturity, Adjusted cost basis and Recorded basis	34,582
Level 2 | Corporate debt securities
AFS Securities
Adjusted cost basis	137,850
Unrealized gains	8
Unrealized losses	(852)
Debt securities, fair market value and recorded basis	137,006
HTM Securities
Debt securities, held-to-maturity, Adjusted cost basis and Recorded basis	152,137	104,823
Unrealized gains	0	0
Unrealized losses	(464)	0
Fair market value	151,673	104,823
Level 2 | Corporate debt securities | Cash and Cash Equivalents
AFS Securities
Debt securities, fair market value and recorded basis
HTM Securities
Debt securities, held-to-maturity, Adjusted cost basis and Recorded basis	14,932
Level 2 | Corporate debt securities | Short-Term Investments
AFS Securities
Debt securities, fair market value and recorded basis	137,006
HTM Securities
Debt securities, held-to-maturity, Adjusted cost basis and Recorded basis	137,205	104,823
Cash
Debt Securities, Available-for-Sale [Line Items]
Cash and cash equivalents, fair value	35,113	3,139
Cash | Cash and Cash Equivalents
Debt Securities, Available-for-Sale [Line Items]
Cash and cash equivalents	35,113	3,139
Money market funds | Level 1
Debt Securities, Available-for-Sale [Line Items]
Cash and cash equivalents, fair value	117,400	64,668
Money market funds | Level 1 | Cash and Cash Equivalents
Debt Securities, Available-for-Sale [Line Items]
Cash and cash equivalents	117,400	64,668
Certificate of deposits and term deposits | Level 2
Debt Securities, Available-for-Sale [Line Items]
Cash and cash equivalents, fair value	337,447	565,089
Certificate of deposits and term deposits | Level 2 | Cash and Cash Equivalents
Debt Securities, Available-for-Sale [Line Items]
Cash and cash equivalents	75,857	140,995
Certificate of deposits and term deposits | Level 2 | Short-Term Investments
Debt Securities, Available-for-Sale [Line Items]
Cash and cash equivalents	$ 261,590	$ 424,094