CASH EQUIVALENTS, INVESTMENTS AND FAIR VALUE MEASUREMENTS - Cost and fair value (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Amortized Cost	$ 329,232	$ 579,620
Gross Unrealized Gains	6	10
Gross Unrealized Losses	(2,044)	(612)
Fair Value	327,194	579,018
U.S. treasury securities
Amortized Cost	173,084	247,287
Gross Unrealized Losses	(1,964)	(520)
Fair Value	171,120	246,767
U.S. government agency securities
Amortized Cost	12,406	5,104
Gross Unrealized Gains	6
Gross Unrealized Losses		(7)
Fair Value	12,412	5,097
Corporate securities
Amortized Cost	1,579	35,627
Gross Unrealized Losses	(2)	(39)
Fair Value	1,577	35,588
Commercial paper
Amortized Cost	70,855	235,352
Gross Unrealized Gains		10
Gross Unrealized Losses	(78)	(46)
Fair Value	70,777	235,316
Money market funds
Amortized Cost	71,308	56,250
Fair Value	$ 71,308	$ 56,250

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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