v3.20.4

Fair Value of Financial Assets and Liabilities (Tables) | 12 Months Ended
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Dec. 31, 2020
Fair Value Disclosures [Abstract] |
Fair Value, Assets Measured on Recurring and Nonrecurring Basis | The following table summarizes the estimated fair value of our financial instruments which are measured at fair value on a recurring basis:
|  |  | Estimated fair value
| Fair value hierarchy |  | December 31, 2020 |  | December 31, 2019
Assets: |  |  |  |  |
Money market funds | 1 |  |  | 1,469 |  |  | 6 |
Marketable equity securities | 1 |  |  | 19 |  |  | 1 |
Derivative instruments-assets | 2 |  |  | 18 |  |  | 10 |
Liabilities: |  |  |  |  |
Derivative instruments-liabilities | 2 |  |  | — |  |  | (1) |

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- Definition Tabular disclosure of assets measured at fair value measured on a recurring or nonrecurring basis. Includes, but is not limited to, fair value measurements recorded and the reasons for the measurements, level within the fair value hierarchy in which the fair value measurements are categorized and transfers between levels 1 and 2. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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