Cash Equivalents And Restricted Securities

6 Months Ended

Jun. 30, 2018

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, 2018	Cost Basis		Gains		Value
Cash equivalents:
Money market funds	$	375	$	--	$	375
Restricted securities:
Money market funds		759		--		759

			Unrealized		Estimated
			Holding		Market
December 31, 2017	Cost Basis		Gains		Value
Cash equivalents:
Money market funds	$	372	$	--	$	372
Restricted securities:
Money market funds		776		--		776

As of June 30, 2018 and December 31, 2017 $759,000 and $776,000, 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 in the three and six months ended June 30, 2018 and 2017. As of June 30, 2018 $759,000 of our restricted securities had a maturity date between three months and one year. As of December 31, 2017 $537,000 of our restricted securities had a maturity date within three months and $239,000 had a maturity date between three months and one year.