Marketable Securities (Tables)

12 Months Ended

Dec. 31, 2019

Investments, Debt and Equity Securities [Abstract]

Schedule of Available-for-sale Securities

The following tables show the Company’s available-for-sale securities’ adjusted cost, gross unrealized gains, gross unrealized losses and fair value by significant investment category as of December 31, 2019 and 2018, respectively:

	2019
Marketable Securities:	Adjusted Cost		Unrealized Gains		Unrealized Losses			Fair Value
Equity securities	$	4,234	$	170	$	—		$	4,404
Money market funds	38,028		771		—			38,799
Corporate bonds	4,021		77		—			4,098
Government securities - U.S.	5,341		110		(5		)	5,446
Other fixed-income securities	1,614		23		—			1,637
Total	$	53,238	$	1,151	$	(5	)	$	54,384

	2018
Marketable Securities:	Adjusted Cost		Unrealized Gains		Unrealized Losses			Fair Value
Equity securities	$	10,101	$	—	$	(956	)	$	9,145
Money market funds	52,733		316		(53		)	52,996
Corporate bonds	6,411		7		(79		)	6,339
Government securities - U.S.	12,714		66		(79		)	12,701
Other fixed-income securities	9,400		22		(13		)	9,409
Total	$	91,359	$	411	$	(1,180	)	$	90,590

Investments Classified by Contractual Maturity Date

The following table summarizes the estimated fair value of our investments in marketable debt securities, accounted for as available-for-sale securities and classified by the contractual maturity date of the securities as of December 31, 2019:

	Maturities
Marketable Debt Securities:	Less than 1 Year		1-5 Years		5-10 Years		Greater than 10 Years		Total
Corporate bonds	$	293	$	3,464	$	341	$	—	$	4,098
Government securities - U.S.	—		4,744		315		387		5,446
Other fixed-income securities	—		1,637		—		—		1,637
Total	$	293	$	9,845	$	656	$	387	$	11,181