Marketable Securities (Tables)

12 Months Ended

Dec. 31, 2021

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:

	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

	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:

	December 31, 2021				December 31, 2020
	Amortized Cost		Estimated Fair Value		Amortized Cost		Estimated Fair Value
Due within one year	$	64,914	$	64,879	$	149,791	$	149,903
Due after one year through two years	390,090		387,996		—		—
Total	$	455,004	$	452,875	$	149,791	$	149,903