Cash Equivalents And Restricted Cash And Securities

12 Months Ended

Dec. 31, 2018

Cash Equivalents And Restricted Cash And Securities [Abstract]

Cash Equivalents And Restricted Cash And 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, 2018	Cost Basis		Gains (Losses)		Value
Cash equivalents:
Money market funds	$	1,445		--	$	1,445
Restricted securities:
Money market funds		747		--		747

			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

As of December 31, 2018 and 2017 $747,000 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 or restricted securities for the years ended December 31, 2018, 2017, and 2016. 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. As of December 31, 2017 $537,000 of our restricted securities had a maturity date within three months and $239,000 of our restricted securities had a maturity date between three months and one year.