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INVESTMENTS (Tables)

12 Months Ended

Dec. 31, 2021

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
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		$	—


														Continuous			Continuous
					Gross			Gross						Unrealized			Unrealized
					Unrealized			Unrealized						Loss Position			Loss Position
		Amortized			Holding			Holding			Fair			less than 12			greater than 12
December 31, 2020		Cost			Gains			Losses			Value			Months			Months
Available-for-sale
Short-term:
Commercial paper		$	119,886		$	—		$	—		$	119,886		$	—		$	—
Certificates of deposit			20,387			—			—			20,387			—			—
Municipal securities			9,083			—			—			9,083			—			—
U.S. government agency securities			81,521			13			3			81,531			3			—
U.S. treasuries			650,386			150			69			650,467			69			—
Long-term:
U.S. government agency securities			10,350			1			—			10,351			—			—
U.S. treasuries			33,946			1			7			33,940			7			—
Total		$	925,559		$	165		$	79		$	925,645		$	79		$	—

Summary of the underlying contractual maturities of investments

The following table summarizes the underlying contractual maturities of the Company’s investments at:


		December 31, 2021						December 31, 2020
		Amortized Cost			Fair Value			Amortized Cost			Fair Value
Less than 1 year:
Commercial paper		$	334,077		$	334,077		$	119,886		$	119,886
Municipal securities			666			666			9,083			9,083
U.S. government agency securities			62,687			62,661			81,521			81,531
Certificates of deposit			44,502			44,502			20,387			20,387
U.S. treasuries			1,308,536			1,307,821			650,386			650,467
Due 1 - 10 years:
U.S. treasuries			87,133			86,943			33,946			33,940
U.S. government agency securities			12,500			12,476			10,350			10,351
Total		$	1,850,101		$	1,849,146		$	925,559		$	925,645