Marketable Securities (Tables)

9 Months Ended

Sep. 30, 2019

Investments, Debt and Equity Securities [Abstract]

Schedule of Available-for-sale and Equity 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 September 30, 2019 and December 31, 2018, respectively:

	September 30, 2019
Marketable Securities:	Adjusted Cost		Unrealized Gains		Unrealized Losses			Fair Value
Equity securities	$	4,200	$	—	$	(24	)	$	4,176
Money market and mutual funds	43,306		785		—			44,091
Corporate bonds	4,190		69		(1		)	4,258
Government securities - U.S.	5,217		129		(2		)	5,344
Other fixed-income securities	1,693		26		(1		)	1,718
Total	$	58,606	$	1,009	$	(28	)	$	59,587

	December 31, 2018
Marketable Securities:	Adjusted Cost		Unrealized Gains		Unrealized Losses			Fair Value
Equity securities	$	10,101	$	—	$	(956	)	$	9,145
Money market and mutual 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

Schedule of Contractual Maturity Dates

The following table summarizes the estimated fair value of our investments in marketable debt securities, accounted for as available-for-sale debt securities and classified by the contractual maturity date of the securities as of September 30, 2019:

	Maturities
Marketable Debt Securities:	Less than 1 Year		1-5 Years		5-10 Years		Greater than 10 Years		Total
Corporate bonds	$	556	$	3,360	$	342	$	—	$	4,258
Government securities - U.S.	—		4,600		—		744		5,344
Other fixed-income securities	49		1,669		—		—		1,718
Total	$	605	$	9,629	$	342	$	744	$	11,320