Financial Instruments (Tables)

6 Months Ended

Jun. 30, 2019

Financial Instruments [Abstract]

Summary Of Financial Instruments Measured At Fair Value

June 30, 2019	Level 1		Level 2		Level 3		Total
Cash equivalents:
Money market funds	$	1,458	$	--	$	--	$	1,458
Restricted securities:
Money market funds		508		--		--		508
Total assets	$	1,966	$	--	$	--	$	1,966

December 31, 2018	Level 1		Level 2		Level 3		Total
Cash equivalents:
Money market funds	$	1,445	$	--	$	--	$	1,445
Restricted securities:
Money market funds		747		--		--		747
Total assets	$	2,192	$	--	$	--	$	2,192