Cash Equivalents And Restricted Cash And Securities

6 Months Ended

Jun. 30, 2020

Cash Equivalents And Restricted Cash And Securities [Abstract]

Cash Equivalents And Restricted Cash And Securities

4. Cash Equivalents and Restricted Securities 

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

			Unrealized		Estimated
			Holding		Market
June 30, 2020	Cost Basis		Gains		Value
Cash equivalents:
Money market funds	$	11,481	$	--	$	11,481
Restricted securities:
Money market funds		491		--		491
Total	$	11,972	$	--	$	11,972
			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	$	2,000	$	--	$	2,000

As of June 30, 2020 and December 31, 2019 certain 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 and restricted securities in the three and six months ended June 30, 2020 and 2019. As of June 30, 2020 $491,000 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.