Marketable Securities (Tables)

3 Months Ended

Mar. 31, 2022

Investments, Debt and Equity Securities [Abstract]

Schedule for Available-for-Sale Securities

The following is a summary of available-for-sale securities as of March 31, 2022 (in thousands):

	Amortized Cost		Gross Unrealized Gain		Gross Unrealized (Losses)		Estimated Fair Value
Tax-exempt municipal securities	$	18,572	$	31	$	(232)	$	18,371
Corporate debt securities	9,758		5		(72)		9,691
Total	$	28,330	$	36	$	(304)	$	28,062

The following is a summary of available-for-sale securities as of December 31, 2021 (in thousands):

	Amortized Cost		Gross Unrealized Gain		Gross Unrealized (Losses)		Estimated Fair Value
Tax-exempt municipal securities	$	18,546	$	271	$	—	$	18,817
Corporate debt securities	10,898		163		—		11,061
Total	$	29,444	$	434	$	—	$	29,878

Schedule of Maturities of Marketable Securities

The following table summarizes the maturities of the Company’s marketable securities as of December 31, 2021 and March 31, 2022 (in thousands):

	December 31, 2021		March 31, 2022
Due within one year	$	6,501	$	6,785
Due after one year through five years	23,377		21,277
Total	$	29,878	$	28,062

Schedule of Proceeds from the Maturities of Available-for-Sale Securities

The following table summarizes the proceeds from the maturities and sales of available-for-sale securities for the three months ended March 31, 2021 and 2022 (in thousands):

	For the three months ended March 31,
	2021		2022
Maturities of marketable securities	$	1,930	$	1,100
Sales of marketable securities	—		—
Total	$	1,930	$	1,100