Investments (Tables)

9 Months Ended

Sep. 30, 2022

Investments Debt And Equity Securities [Abstract]

Schedule of Available-for-sale Investments

Available-for-sale investments consisted of the following as of September 30, 2022 and December 31, 2021 (in thousands):

	September 30, 2022
	Amortized Cost		Unrealized Gain		Unrealized Loss			Estimated Fair Value
Short-term marketable securities
U.S. government debt securities	$	278,192	$	—	$	(4,950	)	$	273,242
Corporate bonds		17,497		—		(212	)		17,285
Total short-term marketable securities	$	295,689	$	—	$	(5,162	)	$	290,527
Long-term marketable securities
U.S. government debt securities	$	20,507	$	—	$	(809	)	$	19,698
Total long-term marketable securities	$	20,507	$	—	$	(809	)	$	19,698

	December 31, 2021
	Amortized Cost		Unrealized Gain		Unrealized Loss			Estimated Fair Value
Short-term marketable securities
U.S. government debt securities	$	186,752	$	4	$	(109	)	$	186,647
Corporate bonds		27,363		—		(14	)		27,349
Total short-term marketable securities	$	214,115	$	4	$	(123	)	$	213,996
Long-term marketable securities
U.S. government debt securities	$	205,472	$	—	$	(974	)	$	204,498
Corporate bonds		12,691		—		(44	)		12,647
Total long-term marketable securities	$	218,163	$	—	$	(1,018	)	$	217,145

Schedule of Gross Unrealized Holding Losses and Fair Value for Investments in Unrealized Loss Position

The following table presents the gross unrealized holding losses and fair value for investments in an unrealized loss position, and the length of time individual securities have been in a continuous loss position, as of September 30, 2022 (in thousands):

	Less Than 12 Months					12 Months Or Greater
	Fair Value		Unrealized Loss			Fair Value		Unrealized Loss
U.S. government debt securities	$	181,925	$	(3,240	)	$	111,015	$	(2,519	)
Corporate bonds		9,349		(95	)		7,936		(117	)
Total available-for-sale securities	$	191,274	$	(3,335	)	$	118,951	$	(2,636	)