Marketable Securities (Tables)

12 Months Ended

Dec. 31, 2019

Investments, Debt and Equity Securities [Abstract]

Schedule for Available-for-Sale Securities

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

The following is a summary of available-for-sale securities as of December 31, 2018 (in thousands):

	Amortized Cost		Gross Unrealized Gain		Gross Unrealized (Losses)			Estimated Fair Value
Corporate debt securities	$	48,202	$	12	$	(284	)	$	47,930
Tax-exempt municipal securities	22,858		45		(34		)	22,869
Variable rate demand notes	4,000		—		—			4,000
Total	$	75,060	$	57	$	(318	)	$	74,799

Schedule of Maturities of Marketable Securities

The following table summarizes the maturities of the Company’s marketable securities as of December 31, 2018 and 2019 (in thousands):

	December 31, 2018		December 31, 2019
Due within one year	$	37,121	$	34,874
Due after one year through five years	37,678		36,633
Total	$	74,799	$	71,507