Marketable Securities (Tables)

3 Months Ended

Mar. 31, 2021

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, 2021 (in thousands):

	Amortized Cost		Gross Unrealized Gain		Gross Unrealized (Losses)		Estimated Fair Value
Tax-exempt municipal securities	$	18,917	$	324	$	—	$	19,241
Corporate debt securities	16,139		355		—		16,494
Total	$	35,056	$	679	$	—	$	35,735

The following is a summary of available-for-sale securities as of December 31, 2020 (in thousands):

	Amortized Cost		Gross Unrealized Gain		Gross Unrealized (Losses)		Estimated Fair Value
Tax-exempt municipal securities	$	19,924	$	365	$	—	$	20,289
Corporate debt securities	17,086		452		—		17,538
Total	$	37,010	$	817	$	—	$	37,827

Schedule of maturities of marketable securities

The following table summarizes the maturities of the Company’s marketable securities as of December 31, 2020 and March 31, 2021 (in thousands):

	December 31, 2020		March 31, 2021
Due within one year	$	7,557	$	6,455
Due after one year through five years	30,270		29,280
Total	$	37,827	$	35,735

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, 2020 and 2021 (in thousands):

	For the three months ended March 31,
	2020		2021
Maturities of marketable securities	$	9,905	$	1,930
Sales of marketable securities	—		—
Total	$	9,905	$	1,930