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INVESTMENTS (Tables)

9 Months Ended

Sep. 30, 2022

INVESTMENTS

Summary of investments in available-for-sale


														Continuous			Continuous
					Gross			Gross						Unrealized			Unrealized
					Unrealized			Unrealized						Loss Position			Loss Position
		Amortized			Holding			Holding			Fair			less than 12			greater than 12
September 30, 2022		Cost			Gains			Losses			Value			Months			Months
Available-for-sale
Short-term:
Commercial paper		$	218,573		$	—		$	7		$	218,566		$	7		$	—
Certificates of deposit			20,035			—			—			20,035			—			—
Municipal securities			193,567			4			1,142			192,429			1,142
U.S. government agency securities			88,573			—			851			87,722			851			—
U.S. treasuries			834,249			—			6,220			828,029			6,220			—
Long-term:
U.S. treasuries			55,684			—			476			55,208			476			—
Municipal securities			5,562			—			35			5,527			35
U.S. government agency securities			11,711			1			74			11,638			74			—
Total		$	1,427,954		$	5		$	8,805		$	1,419,154		$	8,805		$	—


														Continuous			Continuous
					Gross			Gross						Unrealized			Unrealized
					Unrealized			Unrealized						Loss Position			Loss Position
		Amortized			Holding			Holding			Fair			less than 12			greater than 12
December 31, 2021		Cost			Gains			Losses			Value			Months			Months
Available-for-sale
Short-term:
Commercial paper		$	334,077		$	—		$	—		$	334,077		$	—		$	—
Certificates of deposit			44,502			—			—			44,502			—			—
Municipal securities			666			—			—			666			—			—
U.S. government agency securities			62,687			—			26			62,661			26			—
U.S. treasuries			1,308,536			2			717			1,307,821			717			—
Long-term:
U.S. government agency securities			12,500			—			24			12,476			24			—
U.S. treasuries			87,133			—			190			86,943			190			—
Total		$	1,850,101		$	2		$	957		$	1,849,146		$	957		$	—

Summary of the underlying contractual maturities of investments


		September 30, 2022						December 31, 2021
		Amortized Cost			Fair Value			Amortized Cost			Fair Value
Less than 1 year:
Commercial paper		$	218,573		$	218,566		$	334,077		$	334,077
Municipal securities			193,567			192,429			666			666
U.S. government agency securities			88,573			87,722			62,687			62,661
Certificates of deposit			20,035			20,035			44,502			44,502
U.S. treasuries			834,249			828,029			1,308,536			1,307,821
Due 1 -10 years:
Municipal securities			5,562			5,527			—			—
U.S. treasuries			55,684			55,208			87,133			86,943
U.S. government agency securities			11,711			11,638			12,500			12,476
Total		$	1,427,954		$	1,419,154		$	1,850,101		$	1,849,146