Cash Equivalents And Restricted Securities

12 Months Ended

Dec. 31, 2017

Cash Equivalents And Restricted Securities [Abstract]

Cash Equivalents And Restricted Securities

3. Cash Equivalents and Restricted Cash and Securities

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



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

			Unrealized		Estimated
			Holding		Market
December 31, 2016	Cost Basis		Gains (Losses)		Value
Cash equivalents:
Money market funds	$	3,466	$	--	$	3,466
Restricted securities:
Money market funds		699		--		699

As of December 31, 2017 and 2016 $776,000 and $699,000, 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 or restricted securities for the years ended December 31, 2017, 2016, and 2015. 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. As of December 31, 2016 $490,000 of our restricted securities had a maturity date within three months and $209,000 of our restricted securities had a maturity date between three months and one year.