Cash Equivalents And Restricted Securities

6 Months Ended

Jun. 30, 2021

Cash Equivalents And Restricted Securities [Abstract]

Cash Equivalents And Restricted Securities

5. Cash Equivalents and Restricted Securities 

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

			Unrealized		Estimated
			Holding		Market
June 30, 2021	Cost Basis		Gains		Value
Cash equivalents:
Money market funds	$	10,005	$	--	$	10,005
Restricted securities:
Money market funds		554		--		554
Total assets	$	10,559	$	--	$	10,559
			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

As of June 30, 2021 and December 31, 2020 $554,000 and $546,000, 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 to international tax obligations.

There were no gross realized gains or losses on cash equivalents and restricted securities in the three and six months ended June 30, 2021 and 2020. As of June 30, 2021 $554,000 of our restricted securities had a maturity date within three months. As of December 31, 2020 $546,000 of our restricted securities had a maturity date within three months.