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Fair Value Measurements (Tables) | 3 Months Ended
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Mar. 31, 2025
Fair Value Disclosures [Abstract] |
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis | The following tables present the Company's financial assets and liabilities measured at fair value on a recurring basis and their assigned levels within the fair value hierarchy (in thousands):
| March 31, 2025
| Level 1 |  | Level 2 |  | Level 3 |  | Total
Money market funds(1) | $ | 11,715 |  |  | $ | — |  |  | $ | — |  |  | $ | 11,715 |
Total assets | $ | 11,715 |  |  | $ | — |  |  | $ | — |  |  | $ | 11,715 |
Warrant liability | $ | — |  |  | $ | 2,960 |  |  | $ | 2 |  |  | $ | 2,962 |
Total liabilities | $ | — |  |  | $ | 2,960 |  |  | $ | 2 |  |  | $ | 2,962 |
| December 31, 2024
| Level 1 |  | Level 2 |  | Level 3 |  | Total
Money market funds(1) | $ | 12,100 |  |  | $ | — |  |  | $ | — |  |  | $ | 12,100 |
Total assets | $ | 12,100 |  |  | $ | — |  |  | $ | — |  |  | $ | 12,100 |
Warrant liability | $ | — |  |  | $ | 2,827 |  |  | $ | 1 |  |  | $ | 2,828 |
Total liabilities | $ | — |  |  | $ | 2,827 |  |  | $ | 1 |  |  | $ | 2,828 |
_________________ (1) Included in cash, cash equivalents, and restricted cash on the condensed consolidated balance sheets. This balance includes cash requirements settled on a nightly basis.
Schedule of Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation | The following table presents a summary of changes in Level 3 in the fair value of the Company’s common stock warrant liability (in thousands):
| March 31 2025 |  | December 31, 2024 |  |  |  |  |  |
Balance, beginning of the period | $ | 1 |  |  | $ | 11 |  |  |  |  |  |  |
Change in fair value | 1 |  |  | (10) |  |  |  |  |  |  |
Balance, end of the period | $ | 2 |  |  | $ | 1 |  |  |  |  |  |  |
Schedule of Fair Value Measurement Inputs and Valuation Techniques | The fair value of the assumed Angion warrant liability was estimated using the following assumptions:
| March 31, 2025 |  | December 31, 2024
Weighted average strike price | $ | 76.00 |  | $ | 76.00
Contractual term (years) | 3.4 |  | 3.7
Volatility (annual) | 79.1 | % |  | 74.9 | %
Risk-free rate | 4.0 | % |  | 4.4 | %
Dividend yield (per share) | — | % |  | — | %

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- Definition Tabular disclosure of input and valuation technique used to measure fair value and change in valuation approach and technique for each separate class of asset and liability measured on recurring and nonrecurring basis. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 103 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-103 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (bbb)(1) -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 liabilities using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes 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 liability. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-3 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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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/2009/role/commonPracticeRef -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 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -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 + Details
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