Marketable Securities (Tables)

3 Months Ended

Mar. 31, 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 March 31, 2019 and December 31, 2018, respectively:

	March 31, 2019
Marketable Securities:	Adjusted Cost		Unrealized Gains		Unrealized Losses			Fair Value
Equity securities	$	10,133	$	23	$	(331	)	$	9,825
Money market funds	48,438		509		—			48,947
Corporate bonds	3,442		30		(9		)	3,463
Government securities - U.S.	4,249		43		(7		)	4,285
Other fixed-income securities	3,673		30		(2		)	3,701
Total	$	69,935	$	635	$	(349	)	$	70,221

	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 March 31, 2019:

	Maturities
Marketable Debt Securities:	Less than 1 Year		1-5 Years		5-10 Years		Greater than 10 Years		Total
Corporate bonds	$	688	$	2,775	$	—	$	—	$	3,463
Government securities - U.S.	—		3,841		—		444		4,285
Other fixed-income securities	50		3,651		—		—		3,701
Total	$	738	$	10,267	$	—	$	444	$	11,449