Financial Instruments (Tables)

6 Months Ended

Jun. 30, 2018

Financial Instruments [Abstract]

Summary Of Financial Instruments Measured At Fair Value

June 30, 2018	Level 1		Level 2		Level 3		Total
Cash equivalents:
Money market funds	$	375	$	--	$	--	$	375
Restricted securities:
Money market funds		759		--		--		759
Total assets	$	1,134	$	--	$	--	$	1,134

December 31, 2017	Level 1		Level 2		Level 3		Total
Cash equivalents:
Money market funds	$	372	$	--	$	--	$	372
Restricted securities:
Money market funds		776		--		--		776
Total assets	$	1,148	$	--	$	--	$	1,148