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Marketable Securities (Tables)

9 Months Ended

Sep. 30, 2021

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


	September 30, 2021
	Amortized Cost		Unrealized Gain		Unrealized Loss		Estimated Fair Value
Marketable securities
U.S. government securities	$	374,849	$	1	$	(257)	$	374,593
Commercial paper	16,880		—		—		16,880
Asset-backed securities	2,017		—		—		2,017
Corporate debt securities	15,468		3		(7)		15,464
Total marketable securities	$	409,214	$	4	$	(264)	$	408,954


	December 31, 2020
	Amortized Cost		Unrealized Gain		Unrealized Loss		Estimated Fair Value
Marketable securities
U.S. government securities	$	125,823	$	47	$	(6)	$	125,864
Commercial paper	4,991		—		—		4,991
Asset-backed securities	4,294		21		—		4,315
Corporate debt securities	14,683		52		(2)		14,733
Total marketable securities	$	149,791	$	120	$	(8)	$	149,903

Schedule of Available-for-sale Securities Reconciliation

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


	September 30, 2021				December 31, 2020
	Amortized Cost		Estimated Fair Value		Amortized Cost		Estimated Fair Value
Due within one year	$	56,756	$	56,756	$	149,791	$	149,903
Due after one year through two years	352,458		352,198		—		—
Total	$	409,214	$	408,954	$	149,791	$	149,903