Marketable Securities (Tables)

3 Months Ended

Mar. 31, 2021

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, 2021 and December 31, 2020, respectively:

	March 31, 2021
Marketable Securities:	Adjusted Cost		Unrealized Gains		Unrealized Losses		Fair Value
Mutual and money market funds	$	100,704	$	1,138	$	(146)	$	101,696
Corporate bonds	23,448		206		(63)		23,591
Government securities - U.S.	17,401		88		(136)		17,353
Other fixed-income securities	3,155		16		(8)		3,163
Total	$	144,708	$	1,448	$	(353)	$	145,803

	December 31, 2020
Marketable Securities:	Adjusted Cost		Unrealized Gains		Unrealized Losses		Fair Value
Mutual and money market 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

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 March 31, 2021:

	Maturities
Marketable Debt Securities:	Less than 1 Year		1-5 Years		5-10 Years		Greater than 10 Years		Total
Corporate bonds	$	5,225	$	17,352	$	1,014	$	—	$	23,591
Government securities - U.S.	2,109		11,440		1,883		1,921		17,353
Other fixed-income securities	1,009		1,888		266		—		3,163
Total	$	8,343	$	30,680	$	3,163	$	1,921	$	44,107