Cash Equivalents And Restricted Cash And Securities (Tables)

12 Months Ended

Dec. 31, 2016

Cash Equivalents And Restricted Cash And Securities [Abstract]

Summary Of Cash Equivalents And Restricted Cash And Securities

			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
			Unrealized		Estimated
			Holding		Market
December 31, 2015	Cost Basis		Gains (Losses)		Value
Cash equivalents:
Money market funds	$	549	$	--	$	549
Restricted cash and securities:
Cash		5,000		--		5,000
Money market funds		830		--		830