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Fair Value of Financial Instruments (Tables) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2023 | Dec. 31, 2022
Fair Value of Financial Instruments [Abstract] |  |
Schedule of Assets and Liabilities Measured at Fair Value on a Recurring Basis | The following table represents the Company’s assets and liabilities measured at fair value on a recurring basis and the basis for that measurement (in thousands):
|  | September 30, 2023 |
|  | Fair Value |  |  | Level 1 |  |  | Level 2 |  |  | Level 3 |
Assets: |  |  |  |  |  |  |  |  |  |  |  |
Money market funds (1) |  | $ | 1 |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrant |  | $ | 1,003 |  |  | $ | — |  |  | $ | — |  |  | $ | 1,003 |
|  | December 31, 2022 |
|  | Fair Value |  |  | Level 1 |  |  | Level 2 |  |  | Level 3 |
Assets: |  |  |  |  |  |  |  |  |  |  |  |
Money market funds (1) |  | $ | 73 |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Corporate notes and commercial paper |  | $ | 1,078 |  |  | $ | — |  |  | $ | 1,078 |  |  | $ | — |
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants |  | $ | 2,079 |  |  | $ | — |  |  | $ | — |  |  | $ | 2,079 |
(1) | Amounts are included in cash and cash equivalents on the condensed consolidated balance sheets.
| The following table represents the Company’s assets and liabilities measured at fair value on a recurring basis as of December 31, 2022 and 2021 and the basis for that measurement (in thousands):
|  | December 31, 2022 |
|  | Fair Value |  |  | Level 1 |  |  | Level 2 |  |  | Level 3 |
Assets: |  |  |  |  |  |  |  |  |  |  |  |
Money market funds (1) |  | $ | 73 |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Corporate notes and commercial paper |  | $ | 1,078 |  |  | $ | — |  |  | $ | 1,078 |  |  | $ | — |
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrant liability |  | $ | 2,079 |  |  | $ | — |  |  | $ | — |  |  | $ | 2,079 |
|  | December 31, 2021 |
|  | Fair Value |  |  | Level 1 |  |  | Level 2 |  |  | Level 3 |
Money market funds (1) |  | $ | 1,159 |  |  | $ | 1,159 |  |  | $ | — |  |  | $ | — |
Corporate notes and commercial paper |  | $ | 12,195 |  |  | $ | — |  |  | $ | 12,195 |  |  | $ | — |
| (1) | Included in cash and cash equivalents
Schedule of Determination of Fair Value for its Financial Assets | The following tables represents the Company’s determination of fair value for its financial assets (cash equivalents and investments) (in thousands):
|  | September 30, 2023 |
|  |  |  |  | Unrealized |  |  | Unrealized |  |  | Fair |
|  | Cost |  |  | Gains |  |  | Losses |  |  | Value |
Cash and cash equivalents |  | $ | 689 |  |  | $ | — |  |  | $ | — |  |  | $ | 689 |
|  | December 31, 2022 |
|  |  |  |  | Unrealized |  |  | Unrealized |  |  | Fair |
|  | Cost |  |  | Gains |  |  | Losses |  |  | Value |
Cash and cash equivalents |  | $ | 1,828 |  |  | $ | — |  |  | $ | — |  |  | $ | 1,828 |
Short-term investments |  |  | 1,103 |  |  |  | — |  |  |  | (25 | ) |  |  | 1,078 |
|  | $ | 2,931 |  |  | $ | — |  |  | $ | (25 | ) |  | $ | 2,906 |
| The following table represents the Company’s determination of fair value for its financial assets (cash equivalents and investments) (in thousands):
|  | December 31, 2022 |
|  |  |  |  | Unrealized |  |  | Unrealized |  |  | Fair |
|  | Cost |  |  | Gains |  |  | Losses |  |  | Value |
Cash and cash equivalents |  | $ | 1,828 |  |  | $ | — |  |  | $ | — |  |  | $ | 1,828 |
Short-term investments |  |  | 1,103 |  |  |  | — |  |  |  | (25 | ) |  |  | 1,078 |
|  | $ | 2,931 |  |  | $ | — |  |  | $ | (25 | ) |  | $ | 2,906 |
|  | December 31, 2021 |
|  |  |  |  | Unrealized |  |  | Unrealized |  |  | Fair |
|  | Cost |  |  | Gains |  |  | Losses |  |  | Value |
Cash and cash equivalents |  | $ | 5,893 |  |  | $ | — |  |  | $ | — |  |  | $ | 5,893 |
Short-term investments |  |  | 9,276 |  |  |  | — |  |  |  | (9 | ) |  |  | 9,267 |
Long-term investments |  |  | 2,935 |  |  |  | — |  |  |  | (7 | ) |  |  | 2,928 |
|  | $ | 18,104 |  |  | $ | — |  |  | $ | (16 | ) |  | $ | 18,088 |

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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -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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