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FAIR VALUE ACCOUNTING (Tables) | 6 Months Ended
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Jun. 30, 2023
Fair Value Disclosures [Abstract] |
Fair Value Measurements, Recurring and Nonrecurring |
June 30, 2023 | Level 1 |  | Level 2 |  | Level 3 |  | Total
Cash equivalents(1) | $ | — |  |  | $ | 23,236 |  |  | $ | — |  |  | $ | 23,236 |
Investments accounted for at fair value | 17,366 |  |  | 7 |  |  | — |  |  | 17,373 |
Marketable debt securities | — |  |  | 63,231 |  |  | — |  |  | 63,231 |
Convertible note | — |  |  | — |  |  | 59,206 |  |  | 59,206 |
Marketable equity securities | 860 |  |  | 29 |  |  | — |  |  | 889 |
| $ | 18,226 |  |  | $ | 86,503 |  |  | $ | 59,206 |  |  | $ | 163,935 |
(1) Cash equivalents are comprised of United States Treasury Bills and Government Agency Bonds purchased within three months of their maturity date.
December 31, 2022 | Level 1 |  | Level 2 |  | Level 3 |  | Total
Cash equivalents(1) | $ | — |  |  | $ | 30,336 |  |  | $ | — |  |  | $ | 30,336 |
Investments accounted for at fair value | 19,263 |  |  | 66 |  |  | — |  |  | 19,329 |
Marketable debt securities | — |  |  | 11,125 |  |  | — |  |  | 11,125 |
Marketable equity securities | 1,033 |  |  | 34 |  |  | — |  |  | 1,067 |
| $ | 20,296 |  |  | $ | 41,561 |  |  | $ | — |  |  | $ | 61,857 |
(1) Cash equivalents are comprised of United States Treasury Bills and Government Agency Bonds purchased within three months of their maturity date.
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation | The following table is a reconciliation of the beginning and ending balance recorded for the Convertible Note classified as Level 3 in the fair value hierarchy.
Beginning balance, February 14, 2023 | $ | 59,457 |
Unrealized loss included in other income (loss) | (251) |
Ending balance, June 30, 2023 | $ | 59,206 |
As of June 30, 2023, the difference between the fair value of the Convertible Note and the unpaid principal amount is $0.79 million.

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- Definition Tabular disclosure of financial instruments measured at fair value, including those classified in shareholders' equity measured on a recurring or nonrecurring basis. Disclosures include, but are 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. Nonrecurring fair value measurements are those that are required or permitted in the statement of financial position in particular circumstances. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2C -SubTopic 10 -Topic 820 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2C Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-3 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
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- Definition Tabular disclosure of the fair value measurement of assets using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes during the period attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets) and gains or losses recognized in other comprehensive income (loss), and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs), by class of asset. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c) -SubTopic 10 -Topic 820 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-3 + Details
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