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Marketable Securities (Tables)

12 Months Ended

Dec. 31, 2018

Marketable Securities

Schedule for available-for-sale securities

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

	December 31, 2018
		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 (in thousands):

		December 31, 2018
Due within one year	$	37,121
Due after one year through five years		37,678
Total	$	74,799

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