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INVESTMENTS (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Available-for-sale
Amortized Cost	$ 1,850,101	$ 925,559
Gross Unrealized Holding Gains	2	165
Gross Unrealized Holding Losses	957	79
Fair Value	1,849,146	925,645
Continuous Unrealized Loss Position less than 12 Months	957	79
Short-term | Commercial paper
Available-for-sale
Amortized Cost	334,077	119,886
Fair Value	334,077	119,886
Short-term | Certificates of deposit
Available-for-sale
Amortized Cost	44,502	20,387
Fair Value	44,502	20,387
Short-term | Municipal securities
Available-for-sale
Amortized Cost	666	9,083
Fair Value	666	9,083
Short-term | U.S. government agency securities
Available-for-sale
Amortized Cost	62,687	81,521
Gross Unrealized Holding Gains		13
Gross Unrealized Holding Losses	26	3
Fair Value	62,661	81,531
Continuous Unrealized Loss Position less than 12 Months	26	3
Short-term | U.S. treasuries
Available-for-sale
Amortized Cost	1,308,536	650,386
Gross Unrealized Holding Gains	2	150
Gross Unrealized Holding Losses	717	69
Fair Value	1,307,821	650,467
Continuous Unrealized Loss Position less than 12 Months	717	69
Long-term | U.S. government agency securities
Available-for-sale
Amortized Cost	12,500	10,350
Gross Unrealized Holding Gains		1
Gross Unrealized Holding Losses	24
Fair Value	12,476	10,351
Continuous Unrealized Loss Position less than 12 Months	24
Long-term | U.S. treasuries
Available-for-sale
Amortized Cost	87,133	33,946
Gross Unrealized Holding Gains		1
Gross Unrealized Holding Losses	190	7
Fair Value	86,943	33,940
Continuous Unrealized Loss Position less than 12 Months	$ 190	$ 7

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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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