Cash Equivalents And Restricted Cash And Securities

12 Months Ended

Dec. 31, 2020

Cash Equivalents And Restricted Cash And Securities [Abstract]

Cash Equivalents And Restricted Cash And Securities

5. Cash Equivalents and Restricted Cash and Securities

The following is a summary of cash equivalents and marketable securities (in thousands):

			Unrealized		Estimated
			Holding		Market
December 31, 2020	Cost Basis		Gains		Value
Cash equivalents:
Money market funds	$	11,484		--	$	11,484
Restricted securities:
Money market funds		546		--		546
Total assets	$	12,030	$	--	$	12,030
			Unrealized		Estimated
			Holding		Market
December 31, 2019	Cost Basis		Gains		Value
Cash equivalents:
Money market funds	$	1,472		--	$	1,472
Restricted securities:
Money market funds		528		--		528
Total assets	$	2,000	$	--	$	2,000

As of December 31, 2020 and 2019 $546,000 and $528,000, respectively, of our money market funds were designated as short-term restricted securities due to a contractual commitment to hold the securities as pledged collateral relating primarily to international tax obligations.

There were no gross realized gains or losses on cash equivalents or restricted securities for the years ended December 31, 2020, 2019, and 2018. As of December 31, 2020 $546,000 of our restricted securities had a maturity date within three months. As of December 31, 2019 $528,000 of our restricted securities had a maturity date within three months.