Marketable Securities (Tables)

3 Months Ended

Mar. 31, 2020

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, 2020 (in thousands):

	Amortized Cost		Gross Unrealized Gain		Gross Unrealized (Losses)			Estimated Fair Value
Corporate debt securities	$	34,457	$	62	$	(160	)	$	34,359
Tax-exempt municipal securities	23,321		221		(69		)	23,473
Variable rate demand notes	5,600		—		—			5,600
Total	$	63,378	$	283	$	(229	)	$	63,432

The following is a summary of available-for-sale securities as of December 31, 2019 (in thousands):

	Amortized Cost		Gross Unrealized Gain		Gross Unrealized (Losses)			Estimated Fair Value
Corporate debt securities	$	42,584	$	165	$	(40	)	$	42,709
Tax-exempt municipal securities	23,301		112		(215		)	23,198
Variable rate demand notes	5,600		—		—			5,600
Total	$	71,485	$	277	$	(255	)	$	71,507

Schedule of Maturities of Marketable Securities

The following table summarizes the maturities of the Company’s marketable securities as of December 31, 2019 and March 31, 2020 (in thousands):

	December 31, 2019		March 31, 2020
Due within one year	$	34,874	$	26,842
Due after one year through five years	36,633		36,590
Total	$	71,507	$	63,432