The Company began investing in available-for-sale (“AFS”) investments in the fourth quarter of 2021. The following table summarizes our AFS investments. These are classified as "Short-term investments" on the condensed consolidated balance sheets.


	March 31, 2022
	Amortized Cost		Gross Unrealized Gain		Gross Unrealized Loss		Fair Value
	(In thousands)
U.S. Treasury securities	$	43,790	$	—	$	(319)	$	43,471
Corporate bonds	38,529		1		(276)		38,254
Total available-for-sale investments	$	82,319	$	1	$	(595)	$	81,725


	December 31, 2021
	Amortized Cost		Gross Unrealized Gain		Gross Unrealized Loss		Fair Value
	(In thousands)
U.S. Treasury securities	$	8,154	$	—	$	(13)	$	8,141
Corporate bonds	7,343		1		(2)		7,342
Total available-for-sale investments	$	15,497	$	1	$	(15)	$	15,483

The following table presents the breakdown of the available-for-sale investments in an unrealized loss position as of March 31, 2022 and December 31, 2021, respectively.


	March 31, 2022				December 31, 2021
	Fair Value		Gross Unrealized Loss		Fair Value		Gross Unrealized Loss
	(In thousands)
U.S. Treasury securities
Less than 12 months	$	43,471	$	319	$	8,141	$	13
Total	$	43,471	$	319	$	8,141	$	13

Corporate bonds
Less than 12 months	$	36,753	$	276	$	5,640	$	2
Total	$	36,753	$	276	$	5,640	$	2

The Company does not believe these AFS investments to be other-than-temporarily impaired as of March 31, 2022 and December 31, 2021.

There were no realized gains or losses on AFS investments during the three months ended March 31, 2022 and March 31, 2021.

All remaining contractual maturities of AFS investments held at March 31, 2022 are as follows:


	March 31, 2022
	Amortized Cost		Fair Value
	(In thousands)
Due in 1 year or less	$	48,223	$	48,134
Due in 1-2 years	34,096		33,591

Total	$	82,319	$	81,725

Actual maturities may differ from the contractual maturities because the Company may sell these investments prematurely.