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Balance Sheet Components | 12 Months Ended
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Dec. 31, 2024
Organization, Consolidation and Presentation of Financial Statements [Abstract] |
Balance Sheet Components | 4.Balance Sheet Components Prepaid and Other Current Assets Prepaid and other current assets are summarized as follows:
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | As of December 31,
​ |  | 2024 |  | 2023
Prepaid expense | ​ | $ | 2,119 | ​ | $ | 370
Deferred issuance costs | ​ |  | — | ​ |  | 3,710
Costs-share receivables | ​ |  | 600 | ​ |  | 126
Accrued interest receivable | ​ |  | 1,138 | ​ |  | —
Rent security | ​ |  | 143 | ​ |  | —
Refundable deposit | ​ |  | 125 | ​ |  | 125
Total prepaid and other current assets | ​ | $ | 4,125 | ​ | $ | 4,331
​ Prepaid expenses include prepaid consulting fees, insurance premiums, rent and other charges. The deferred issuance costs were specific incremental costs of the Business Combination. Cost-share receivables refer to the monetary assets obtained by the Company through several R&D cost-share projects related to nuclear recycling technologies awarded by the DOE’s ARPA-E. Refundable deposit represents an advance payment for the grant of a right to purchase certain land, subject to certain conditions. Prepaid expenses are amortized over the straight-line method over the contract term. The deferred issuance costs have been charged against the proceeds of the recapitalization. Cost-share receivables are recorded as eligible costs are incurred. The refundable deposit will either be applied to the final purchase price of the land or refunded, as amended, no later than June 30, 2025. Property and Equipment, Net Property and equipment, net are summarized as follows:
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | As of December 31,
​ |  | 2024 |  | 2023
Computers and equipment |  | $ | 366 |  | $ | 197
Furniture, fixtures and machinery | ​ |  | 146 | ​ |  | 65
Software | ​ |  | 1,020 | ​ |  | 392
Leasehold improvements | ​ |  | 45 | ​ |  | 31
Total property and equipment, gross | ​ |  | 1,577 | ​ |  | 685
Less accumulated depreciation and amortization | ​ |  | (375) | ​ |  | (107)
Total property and equipment, net | ​ | $ | 1,202 | ​ | $ | 578
​ Depreciation and amortization expenses for the years ended December 31, 2024 and 2023 totaled $268 and $75, respectively. Accrued Expenses and Other Accrued expenses and other are summarized as follows:
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | As of December 31,
​ | ​ | 2024 | ​ | 2023
Accrued professional fees |  | $ | 652 |  | $ | —
Accrued payroll and bonuses | ​ |  | 636 | ​ |  | 197
Credit card liabilities | ​ |  | 261 | ​ |  | 156
Franchise and income taxes payable | ​ |  | 202 | ​ |  | —
General accrued expenses | ​ |  | 134 | ​ |  | 483
Total accrued expenses and other | ​ | $ | 1,885 | ​ | $ | 836
​

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- Definition The entire disclosure for supplemental balance sheet disclosures, including descriptions and amounts for assets, liabilities, and equity. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 210 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/210/tableOfContent + Details
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