Marketable Securities (Tables)

3 Months Ended

Mar. 31, 2022

Investments [Abstract]

Marketable Securities

The amortized cost, unrealized gain (loss), and estimated fair value of the Company's investments in securities available for sale consisted of the following:

	March 31, 2022
	Amortized Cost		Unrealized Gain		Unrealized Loss		Estimated Fair Value
Marketable securities
U.S. government securities	$	420,277	$	—	$	(7,824)	$	412,453
Commercial paper	15,972		—		—		15,972
Asset-backed securities	—		—		—		—
Corporate debt securities	18,793		—		(172)		18,621
Total marketable securities	$	455,042	$	—	$	(7,996)	$	447,046

	December 31, 2021
	Amortized Cost		Unrealized Gain		Unrealized Loss		Estimated Fair Value
Marketable securities
U.S. government securities	$	420,392	$	—	$	(2,107)	$	418,285
Commercial paper	13,878		—		—		13,878
Asset-backed securities	2,003		—		(1)		2,002
Corporate debt securities	18,731		3		(24)		18,710
Total marketable securities	$	455,004	$	3	$	(2,132)	$	452,875

Schedule of Available-for-sale Securities Reconciliation

The following table summarizes the stated maturities of the Company’s marketable securities:

	March 31, 2022				December 31, 2021
	Amortized Cost		Estimated Fair Value		Amortized Cost		Estimated Fair Value
Due within one year	$	167,575	$	165,767	$	64,914	$	64,879
Due after one year through two years	287,467		281,279		390,090		387,996
Total	$	455,042	$	447,046	$	455,004	$	452,875