Investments (Tables)

3 Months Ended

Mar. 31, 2022

Investments Debt And Equity Securities [Abstract]

Schedule of Available-for-sale Investments

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

	March 31, 2022
	Amortized Cost		Unrealized Gain		Unrealized Loss			Estimated Fair Value
Short-term marketable securities
U.S. government debt securities	$	210,589	$	—	$	(1,405	)	$	209,184
Corporate bonds		39,859		—		(286	)		39,573
Total short-term marketable securities	$	250,448	$	—	$	(1,691	)	$	248,757
Long-term marketable securities
U.S. government debt securities	$	140,202	$	—	$	(3,092	)	$	137,110
Total long-term marketable securities	$	140,202	$	—	$	(3,092	)	$	137,110

	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 March 31, 2022 (in thousands):

	Less Than 12 Months					12 Months Or Greater
	Fair Value		Unrealized Loss			Fair Value		Unrealized Loss
U.S. government debt securities	$	346,294	$	(4,497	)	$	—	$	—
Corporate bonds		39,573		(286	)		—		—
Total available-for-sale securities	$	385,867	$	(4,783	)	$	—	$	—