Cash Equivalents And Restricted Securities

6 Months Ended

Jun. 30, 2019

Cash Equivalents And Restricted Securities [Abstract]

Cash Equivalents And Restricted Securities

3. Cash Equivalents and Restricted Securities 

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

			Unrealized		Estimated
			Holding		Market
June 30, 2019	Cost Basis		Gains		Value
Cash equivalents:
Money market funds	$	1,458	$	--	$	1,458
Restricted securities:
Money market funds		508		--		508
			Unrealized		Estimated
			Holding		Market
December 31, 2018	Cost Basis		Gains		Value
Cash equivalents:
Money market funds	$	1,445	$	--	$	1,445
Restricted securities:
Money market funds		747		--		747

As of June 30, 2019 and December 31, 2018 all 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 and restricted securities in the three and six months ended June 30, 2019 and 2018. As of June 30, 2019 $508,000 of our restricted securities had a maturity date within three months. As of December 31, 2018 $512,000 of our restricted securities had a maturity date within three months and $235,000 had a maturity date between three months and one year.