Cash Equivalents And Restricted Securities

9 Months Ended

Sep. 30, 2021

Cash Equivalents And Restricted Securities [Abstract]

Cash Equivalents And Restricted Securities

6. Cash Equivalents and Restricted Securities 

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

			Unrealized		Estimated
			Holding		Market
September 30, 2021	Cost Basis		Gains		Value
Cash equivalents:
Money market funds	$	10,012	$	--	$	10,012
Restricted securities:
Money market funds		538		--		538
Total assets	$	10,550	$	--	$	10,550
			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 September 30, 2021 and December 31, 2020 $538,000 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 for the three and nine months ended September 30, 2021 and 2020. As of September 30, 2021 $538,000 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.