Marketable Securities (Tables)

12 Months Ended

Dec. 31, 2021

Investments Debt And Equity Securities [Abstract]

Summary of Company Marketable Securities

The following tables present a summary of the Company’s marketable securities, which consist solely of available-for-sale debt securities (in thousands):

	Amortized Cost		Unrealized Gains		Unrealized Losses			Fair Value
December 31, 2021
U.S. government and agency securities	$	60,118	$	—	$	(229	)	$	59,889
Certificates of deposit		2,936		2		(11	)		2,927
Corporate bonds		442,792		62		(1,533	)		441,321
	$	505,846	$	64	$	(1,773	)	$	504,137

	Amortized Cost		Unrealized Gains		Unrealized Losses			Fair Value
December 31, 2020
U.S. government and agency securities	$	12,782	$	22	$	—		$	12,804
Certificates of deposit		1,956		34		—			1,990
Corporate bonds		165,850		497		(55	)		166,292
Municipal securities		3,035		2		—			3,037
	$	183,623	$	555	$	(55	)	$	184,123

Summary of unrealized gain (loss) on available-for-sale securities, net, presented in the statements of operations and comprehensive income (loss)

Unrealized gain (loss) on available-for-sale securities, net, presented in the statements of operations and comprehensive income (loss) consisted of the following (in thousands):

	Years Ended December 31,
	2021			2020			2019
Unrealized gain (loss) before reclassifications	$	(2,202	)	$	(426	)	$	1,392
Realized gains reclassified to investment income		(7	)		(139	)		(40	)
Income tax expense		—			—			(467	)
Unrealized gain (loss) on available-for-sale securities, net	$	(2,209	)	$	(565	)	$	885

Summary of Fair Values and Unrealized Losses of Marketable Securities Held by the Company in an Unrealized Loss Position for Less Than 12 months and 12 Months or Greater

The following tables present the fair values and unrealized losses of available-for-sale debt securities held by the Company in an unrealized loss position for less than 12 months and 12 months or greater (in thousands):

	Less than 12 Months					12 Months or Greater				Total
	Fair Value		Unrealized Losses			Fair Value		Unrealized Losses		Fair Value		Unrealized Losses
December 31, 2021
U.S. government and agency securities	$	59,889	$	(229	)	$	—	$	—	$	59,889	$	(229	)
Certificates of deposit		2,195		(11	)		—		—		2,195		(11	)
Corporate bonds		385,115		(1,533	)		—		—		385,115		(1,533	)
	$	447,199	$	(1,773	)	$	—	$	—	$	447,199	$	(1,773	)

	Less than 12 Months					12 Months or Greater				Total
	Fair Value		Unrealized Losses			Fair Value		Unrealized Losses		Fair Value		Unrealized Losses
December 31, 2020
Corporate bonds	$	55,507	$	(55	)	$	—	$	—	$	55,507	$	(55	)
	$	55,507	$	(55	)	$	—	$	—	$	55,507	$	(55	)