Financial Instruments

3 Months Ended

Mar. 31, 2022

Investments All Other Investments [Abstract]

Financial Instruments

4. Financial Instruments

Cash equivalents and short-term investments (debt securities) which are classified as available-for-sale debt securities, consisted of the following (in thousands):

March 31, 2022	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value
Money market funds (cash equivalents)	$	34,817	$	—	$	—	$	34,817
Total financial assets	$	34,817	$	—	$	—	$	34,817
Classified as:
Cash and cash equivalents							$	34,817
Total							$	34,817

December 31, 2021	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value
Money market funds (cash equivalents)	$	44,347	$	—	$	—	$	44,347
U.S. government agency securities		2,504		—		—		2,504
Total financial assets	$	46,851	$	—	$	—	$	46,851
Classified as:
Cash and cash equivalents							$	44,347
Short-term investments								2,504
Total							$	46,851

There have been no material realized gains or losses on available-for-sale debt securities for the periods presented. As of March 31, 2022, the Company had no available-for-sale debt securities.