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Cash Equivalents And Restricted Cash And Securities (Tables)

12 Months Ended

Dec. 31, 2018

Cash Equivalents And Restricted Cash And Securities [Abstract]

Summary Of Cash Equivalents And Restricted Cash And Securities



				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