Financial Instruments (Tables)

6 Months Ended

Jun. 30, 2020

Financial Instruments [Abstract]

Summary Of Financial Instruments Measured At Fair Value

June 30, 2020	Level 1		Level 2		Level 3		Total
Cash equivalents:
Money market funds	$	11,481	$	--	$	--	$	11,481
Restricted securities:
Money market funds		491		--		--		491
Endospan loan		--		--		358		358
Total assets	$	11,972	$	--	$	358	$	12,330

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 June 30, 2020	$	358