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Financial Instruments
12 Months Ended
Dec. 31, 2019
Financial Instruments [Abstract]  
Financial Instruments 4. Financial Instruments

A summary of financial instruments measured at fair value is as follows (in thousands):

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

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

We used prices quoted from our investment management companies to determine the Level 1 valuation of our investments in money market funds. We recorded the Endospan Loan, classified as Level 3, as a result of an agreement with Endospan in September 2019. See Note 2 for further discussion of the Endospan Loan. Changes in fair value of Level 3 assets are listed in the table below (in thousands):

Endospan Loan

Balance as of December 31, 2018

$

--

Initial value of Endospan Loan

358

Change in valuation of Endospan Loan

--

Balance as of December 31, 2019

$

358

During the year ended December 31, 2017 we initially recorded certain non-financial assets at fair value related to the acquisition JOTEC. Disclosure of this initial fair value determination is included in Note 3 above.