Marketable Securities (Tables)

6 Months Ended

Jun. 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 June 30, 2019 and December 31, 2018, respectively:

	June 30, 2019
Marketable Securities:	Adjusted Cost		Unrealized Gains		Unrealized Losses			Fair Value
Equity securities	$	4,166	$	—	$	(128	)	$	4,038
Money market funds	46,314		719		—			47,033
Corporate bonds	3,611		54		(1		)	3,664
Government securities - U.S.	5,122		114		(2		)	5,234
Other fixed-income securities	2,154		29		(1		)	2,182
Total	$	61,367	$	916	$	(132	)	$	62,151

	December 31, 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

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 securities and classified by the contractual maturity date of the securities as of June 30, 2019:

	Maturities
Marketable Debt Securities:	Less than 1 Year		1-5 Years		5-10 Years		Greater than 10 Years		Total
Corporate bonds	$	735	$	2,929	$	—	$	—	$	3,664
Government securities - U.S.	—		4,798		—		436		5,234
Other fixed-income securities	426		1,756		—		—		2,182
Total	$	1,161	$	9,483	$	—	$	436	$	11,080