Marketable Securities

12 Months Ended

Dec. 31, 2021

Investments, Debt and Equity Securities [Abstract]

4. Marketable Securities

Marketable securities, which are classified as available-for-sale, consisted of the following as of December 31, 2021 (in thousands):


	Amortized Cost Basis		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value as of December 31, 2021
Short-term marketable securities:
Commercial paper	$	32,471	$	—	$	(4	)	$	32,467
Corporate bonds		57,315		—		(79	)		57,236
US Treasuries		5,082		—		(9	)		5,073
Total short-term marketable securities	$	94,868	$	—	$	(92	)	$	94,776
Long-term marketable securities:
Commercial paper	$	5,089	$	—	$	(21	)	$	5,068
Corporate bonds		37,821		—		(193	)		37,628
US Treasuries		25,073		—		(117	)		24,956
Total long-term marketable securities	$	67,983	$	—	$	(331	)	$	67,652

All marketable securities held as of December 31, 2021, had contractual maturities of less than two years. There have been no realized gains or losses on marketable securities for the periods presented. None of the Company's investments in marketable securities has been in an unrealized loss position for more than one year. The Company determined that it has the ability and intent to hold all marketable securities that have been in a continuous loss position until maturity or recovery, thus there has been no recognition of any other-than-temporary impairment in the year ended December 31, 2021.

As of December 31, 2020, the Company had no marketable securities.