CASH, CASH EQUIVALENTS AND SHORT-TERM INVESTMENTS - Schedule of Cash and Cash Equivalents and Short-Term Investments (Details) € in Thousands, $ in Thousands	Sep. 30, 2023 USD ($)	Sep. 30, 2023 EUR (€)	Dec. 31, 2022 USD ($)	Sep. 30, 2022 USD ($)
Debt Securities, Available-for-Sale [Line Items]
Cash and cash equivalents	$ 154,860		$ 115,326	$ 243,805
HTM Securities
Debt securities, held-to-maturity, adjusted cost basis and recorded basis	607,568		537,153
Unrealized gains	98		1,086
Unrealized losses	(310)		(1,139)
Fair market value	607,356		537,100
Debt securities, available-for-sale and held-to-maturity, adjusted cost basis	921,248		969,425
Debt securities, available-for-sale and held-to-maturity, unrealized gains	98		1,086
Debt securities, available-for-sale and held-to-maturity, unrealized losses	(310)		(1,139)
Debt securities, available-for-sale and held-to-maturity, fair value	921,036		969,372
Debt securities, available-for-sale and held-to-maturity	921,248		969,425
Asset pledged as collateral
HTM Securities
Debt securities, available-for-sale and held-to-maturity, adjusted cost basis	15,862	€ 15,000
Level 1 | U.S. Treasury bills
HTM Securities
Debt securities, held-to-maturity, adjusted cost basis and recorded basis	109,595		188,030
Unrealized gains	15		8
Unrealized losses	(14)		(540)
Fair market value	109,596		187,498
Level 2 | Government and governmental agencies
HTM Securities
Debt securities, held-to-maturity, adjusted cost basis and recorded basis	24,596		44,357
Unrealized gains	0		12
Unrealized losses	(15)		(12)
Fair market value	24,581		44,357
Level 2 | Corporate debt securities
HTM Securities
Debt securities, held-to-maturity, adjusted cost basis and recorded basis	473,377		304,766
Unrealized gains	83		1,066
Unrealized losses	(281)		(587)
Fair market value	473,179		305,245
Cash and cash equivalents
HTM Securities
Debt securities, held-to-maturity, adjusted cost basis and recorded basis	0		0
Debt securities, available-for-sale and held-to-maturity	154,860		115,326
Cash and cash equivalents | Level 2 | Corporate debt securities
HTM Securities
Debt securities, held-to-maturity, adjusted cost basis and recorded basis	0		0
Short-term investments (2)
HTM Securities
Debt securities, held-to-maturity, adjusted cost basis and recorded basis	607,568		537,153
Debt securities, available-for-sale and held-to-maturity	766,388		854,099
Short-term investments (2) | Level 1 | U.S. Treasury bills
HTM Securities
Debt securities, held-to-maturity, adjusted cost basis and recorded basis	109,595		188,030
Short-term investments (2) | Level 2 | Government and governmental agencies
HTM Securities
Debt securities, held-to-maturity, adjusted cost basis and recorded basis	24,596		44,357
Short-term investments (2) | Level 2 | Corporate debt securities
HTM Securities
Debt securities, held-to-maturity, adjusted cost basis and recorded basis	473,377		304,766
Cash
Debt Securities, Available-for-Sale [Line Items]
Cash and cash equivalents, fair value	8,636		9,697
Cash | Cash and cash equivalents
Debt Securities, Available-for-Sale [Line Items]
Cash and cash equivalents	8,636		9,697
Money market funds | Level 1
Debt Securities, Available-for-Sale [Line Items]
Cash and cash equivalents, fair value	141,224		105,629
Money market funds | Cash and cash equivalents | Level 1
Debt Securities, Available-for-Sale [Line Items]
Cash and cash equivalents	141,224		105,629
Certificate of deposits and term deposits | Level 2
Debt Securities, Available-for-Sale [Line Items]
Cash and cash equivalents, fair value	163,820		316,946
Certificate of deposits and term deposits | Cash and cash equivalents | Level 2
Debt Securities, Available-for-Sale [Line Items]
Cash and cash equivalents	5,000		0
Certificate of deposits and term deposits | Short-term investments (2) | Level 2
Debt Securities, Available-for-Sale [Line Items]
Cash and cash equivalents	$ 158,820		$ 316,946