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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):


					Gross			Gross Unrealized			Estimated Fair
		Amortized Cost			Unrealized Gain			(Losses)			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):


					Gross			Gross Unrealized			Estimated Fair
		Amortized Cost			Unrealized Gain			(Losses)			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