Marketable Securities

9 Months Ended

Sep. 30, 2020

Investments Debt And Equity Securities [Abstract]

4. Marketable Securities

Marketable securities, which are classified as available-for-sale, consisted of the following as of September 30, 2020 (in thousands):

	Amortized Cost Basis		Unrealized Gains		Unrealized Losses		Fair Value
Cash equivalents:
Money market funds	$	28,832	$	—	$	—	$	28,832
U.S. and foreign commercial paper		9,999		—		—		9,999
Total cash equivalents		38,831		—		—		38,831
Short-term marketable securities:
U.S. and foreign commercial paper		13,740		3		—		13,743
U.S. and foreign corporate debt securities		8,577		15		—		8,592
U.S. government debt securities		20,902		22		—		20,924
U.S. treasuries		40,348		26		—		40,374
Total short-term marketable securities		83,567		66		—		83,633
Total	$	122,398	$	66	$	—	$	122,464

Marketable securities, which are classified as available-for-sale, consisted of the following as of December 31, 2019 (in thousands):

	Amortized Cost Basis		Unrealized Gains		Unrealized Losses			Fair Value
Cash equivalents:
Money market funds	$	29,377	$	—	$	—		$	29,377
U.S. and foreign commercial paper		4,999		—		—			4,999
U.S. government debt securities		2,550		—		—			2,550
Total cash equivalents		36,926		—		—			36,926
Short-term marketable securities:
U.S. and foreign commercial paper		11,965		7		—			11,972
U.S. and foreign corporate debt securities		8,748		8		(1	)		8,755
U.S. government debt securities		48,647		71		—			48,718
U.S. treasuries		15,057		6		—			15,063
Total short-term marketable securities		84,417		92		(1	)		84,508
Long-term marketable securities
U.S. treasuries		3,025		—		—			3,025
Total long-term marketable securities		3,025		—		—			3,025
Total	$	124,368	$	92	$	(1	)	$	124,459

At September 30, 2020, the remaining contractual maturities of available-for-sale securities were less than one year. There have been no significant realized gains or losses on available-for-sale securities for the periods presented. Available-for-sale debt securities that were in a continuous loss position but were not deemed to be other than temporarily impaired were immaterial at both September 30, 2020 and December 31, 2019. The Company does not intend to and does not believe it is more likely than not that it will be required to sell these debt securities before their maturities.

See Note 3, “Fair Value Measurements,” for further information regarding the fair value of the Company’s financial instruments.