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Equity Instruments (Tables) | 6 Months Ended
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Jun. 30, 2026
Equity [Abstract] |
Schedule of Shares of Common Stock Reserved for Issuance | Shares of common stock reserved for future issuance on an “as if converted” basis were as follows:
|  | June 30, |  |  | December 31, |
|  | 2026 |  |  | 2025 |
|  | (share data) |
Common stock warrants |  |  | 36,892 |  |  |  | 36,892 |
Shares available for future grant under 2021 Equity Incentive Plan |  |  | 3,597,959 |  |  |  | — |
Reserved for At-the-Market offering |  |  | 2,753,177 |  |  |  | 5,383 |
Reserved for employee stock purchase plan |  |  | 394,863 |  |  |  | 148,787 |
Total shares of common stock reserved |  |  | 6,782,891 |  |  |  | 191,062 |
Schedule of Warrants for Shares of Stock | Warrants for shares of common stock consisted of the following:
|  | June 30, 2026 |
|  | Issue Date |  | Expiration Date |  | Number of Warrants |  |  | Exercise Price per warrant |
Private Placement Warrants — Common Stock |  | 12/02/2020 |  | 09/29/2026 |  |  | 8,477 |  |  | $ | 6,037.50 |
Public Warrants — Common Stock |  | 12/02/2020 |  | 09/29/2026 |  |  | 16,429 |  |  | $ | 6,037.50 |
2022 Private Warrant — Common Stock |  | 07/25/2022 |  | 07/24/2034 |  |  | 134 |  |  | $ | 1,344.00 |
2023 Placement Agent Warrants — Common Stock |  | 12/29/2023 |  | 12/29/2028 |  |  | 3,429 |  |  | $ | 326.29 |
BEPO Warrants — Common Stock |  | 4/12/2024 |  | 4/12/2029 |  |  | 5,157 |  |  | $ | 183.75 |
BEPO Agent Warrants — Common Stock |  | 4/12/2024 |  | 4/12/2029 |  |  | 3,266 |  |  | $ | 202.13 |
|  |  |  |  |  |  | 36,892 |  |  |  |
|  | December 31, 2025 |
|  | Issue Date |  | Expiration Date |  | Number of Warrants |  |  | Exercise Price per warrant |
Private placement warrants — Common Stock |  | 12/02/2020 |  | 09/29/2026 |  |  | 8,477 |  |  | $ | 6,037.50 |
Public warrants – Common Stock |  | 12/02/2020 |  | 09/29/2026 |  |  | 16,429 |  |  | $ | 6,037.50 |
2022 Private Warrant — Common Stock |  | 07/25/2022 |  | 07/24/2034 |  |  | 134 |  |  | $ | 1,344.00 |
2023 Placement Agent Warrants — Common Stock |  | 12/29/2023 |  | 12/29/2028 |  |  | 3,429 |  |  | $ | 326.29 |
BEPO Warrants — Common Stock |  | 4/12/2024 |  | 4/12/2029 |  |  | 5,157 |  |  | $ | 183.75 |
BEPO Agent Warrants — Common Stock |  | 4/12/2024 |  | 4/12/2029 |  |  | 3,266 |  |  | $ | 202.13 |
|  |  |  |  |  |  | 36,892 |  |  |  |
Fair Value Assumptions | The fair value assumptions were as follows:
|  | As of June 30, 2026
|  | Current stock price |  |  | Expected volatility |  |  | Risk-free interest rate |  |  | Dividend rate |  |  | Expected term (years)
2022 Private Warrant(i) |  | $ | 17.55 |  |  |  | 164.9 | % |  |  | 4.1 | % |  |  | — | % |  | 8.07
Placement Agent Warrants(i) |  |  | 17.55 |  |  |  | 201.7 | % |  |  | 3.9 | % |  |  | — | % |  | 2.50
BEPO Warrants, BEPO Agent Warrant(i) |  |  | 17.55 |  |  |  | 197.4 | % |  |  | 3.8 | % |  |  | — | % |  | 2.79
|  | As of December 31. 2025
|  | Current stock price |  |  | Expected volatility |  |  | Risk-free interest rate |  |  | Dividend rate |  |  | Expected term (years)
2022 Private Warrant(i) |  | $ | 13.74 |  |  |  | 162.8 | % |  |  | 3.8 | % |  |  | — | % |  | 8.57
Placement Agent Warrants(i) |  |  | 13.74 |  |  |  | 180.9 | % |  |  | 3.7 | % |  |  | — | % |  | 3.00
BEPO Warrants, BEPO Agent Warrant(i) |  |  | 13.74 |  |  |  | 175.3 | % |  |  | 3.6 | % |  |  | — | % |  | 3.28
(i) The fair value assumptions used the Black-Scholes simulation model for the valuation.
Schedule of Fair Value Assumptions Contingent Earnout Liabilities | Assumptions used in the fair value of the contingent earnout liabilities are described below.
|  | As of June 30, 2026
|  | Current stock price |  |  | Expected volatility |  |  | Risk-free interest rate |  |  | Dividend rate |  |  | Expected term (years)
Contingent earnout liabilities |  | $ | 17.55 |  |  |  | 181.3 | % |  |  | 3.9 | % |  |  | — | % |  | 0.25
|  | As of December 31. 2025
|  | Current stock price |  |  | Expected volatility |  |  | Risk-free interest rate |  |  | Dividend rate |  |  | Expected term (years)
Contingent earnout liabilities |  | $ | 13.74 |  |  |  | 193.6 | % |  |  | 3.5 | % |  |  | — | % |  | 0.75

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- Definition Tabular disclosure of an entity's stock, including par or stated value per share, number and dollar amount of share subscriptions, shares authorized, shares issued, shares outstanding, number and dollar amount of shares held in an employee trust, dividend per share, total dividends, share conversion features, par value plus additional paid in capital, the value of treasury stock and other information necessary to a fair presentation, and EPS information. Stock by class includes common, convertible, and preferred stocks which are not redeemable or redeemable solely at the option of the issuer. Includes preferred stock with redemption features that are solely within the control of the issuer and mandatorily redeemable stock if redemption is required to occur only upon liquidation or termination of the reporting entity. If more than one issue is outstanding, state the title of each issue and the corresponding dollar amount; dollar amount of any shares subscribed but unissued and the deduction of subscriptions receivable there from; number of shares authorized, issued, and outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(27)) -SubTopic 10 -Topic 210 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 505 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480008/505-10-S99-1 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481112/505-10-50-3 Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481112/505-10-50-4 Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481112/505-10-50-5 Reference 8: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481142/505-10-45-2 Reference 9: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 10 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481112/505-10-50-10 Reference 10: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 8 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481112/505-10-50-8 Reference 11: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 505 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481112/505-10-50-6 Reference 12: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 505 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 7 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481112/505-10-50-7 + Details
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- Definition Tabular disclosure of warrants or rights issued. Warrants and rights outstanding are derivative securities that give the holder the right to purchase securities (usually equity) from the issuer at a specific price within a certain time frame. Warrants are often included in a new debt issue to entice investors by a higher return potential. The main difference between warrants and call options is that warrants are issued and guaranteed by the company, whereas options are exchange instruments and are not issued by the company. Also, the lifetime of a warrant is often measured in years, while the lifetime of a typical option is measured in months. Disclose the title of issue of securities called for by warrants and rights outstanding, the aggregate amount of securities called for by warrants and rights outstanding, the date from which the warrants or rights are exercisable, and the price at which the warrant or right is exercisable. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 505 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481112/505-10-50-3 + Details
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