Financial Instruments (Tables)

3 Months Ended

Mar. 31, 2020

Financial Instruments [Abstract]

Summary Of Financial Instruments Measured At Fair Value

March 31, 2020	Level 1		Level 2		Level 3		Total
Cash equivalents:
Money market funds	$	1,478	$	--	$	--	$	1,478
Restricted securities:
Money market funds		494		--		--		494
Endospan Loan		--		--		358		358
Total assets	$	1,972	$	--	$	358	$	2,330

December 31, 2019	Level 1		Level 2		Level 3		Total
Cash equivalents:
Money market funds	$	1,472	$	--	$	--	$	1,472
Restricted securities:
Money market funds		528		--		--		528
Endospan Loan		--		--		358		358
Total assets	$	2,000	$	--	$	358	$	2,358

Reconciliation Of Changes In Fair Value Of Level 3 Liabilities

		Endospan Loan
Balance as of December 31, 2019	$	358
Change in valuation of Endospan Loan		--
Balance as of March 31, 2020	$	358