Cash Equivalents And Restricted Securities (Tables)

6 Months Ended

Jun. 30, 2017

Cash Equivalents And Restricted Securities [Abstract]

Summary Of Cash Equivalents And Restricted Securities

			Unrealized		Estimated
			Holding		Market
June 30, 2017	Cost Basis		Gains		Value
Cash equivalents:
Money market funds	$	370	$	--	$	370
Restricted securities:
Money market funds		741		--		741
			Unrealized		Estimated
			Holding		Market
December 31, 2016	Cost Basis		Gains		Value
Cash equivalents:
Money market funds	$	3,466	$	--	$	3,466
Restricted securities:
Money market funds		699		--		699