Cash Equivalents And Restricted Cash And Securities (Tables)

6 Months Ended

Jun. 30, 2019

Cash Equivalents And Restricted Securities [Abstract]

Summary Of Cash Equivalents And Restricted Securities

			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