Marketable Securities (Tables)

12 Months Ended

Dec. 31, 2020

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, 2020 and 2019, respectively:

	2020
Marketable Securities:	Adjusted Cost		Unrealized Gains		Unrealized Losses		Fair Value
Money market and mutual funds	$	103,404	$	1,288	$	(20)	$	104,672
Corporate bonds	21,811		350		(6)		22,155
Government securities - U.S.	18,849		155		(5)		18,999
Other fixed-income securities	3,839		22		(7)		3,854
Total	$	147,903	$	1,815	$	(38)	$	149,680

	2019
Marketable Securities:	Adjusted Cost		Unrealized Gains		Unrealized Losses		Fair Value
Equity securities	$	4,234	$	170	$	—	$	4,404
Money market and mutual 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

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, 2020:

	Maturities
Marketable Debt Securities:	Less than 1 Year		1-5 Years		5-10 Years		Greater than 10 Years		Total
Corporate bonds	$	6,054	$	14,468	$	1,633	$	—	$	22,155
Government securities - U.S.	—		13,827		2,038		3,134		18,999
Other fixed-income securities	1,017		2,837		—		—		3,854
Total	$	7,071	$	31,132	$	3,671	$	3,134	$	45,008