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SUPPLEMENTAL FINANCIAL INFORMATION (Tables) | 12 Months Ended
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Dec. 31, 2023
Organization, Consolidation and Presentation of Financial Statements [Abstract] |
Schedules of Concentration of Risk, by Risk Factor | The Company’s sales to major customers (purchases in excess of 10% of total sales) are as follows:
| Years Ended December 31,
| 2023 |  | 2022 |  | 2021
Customer 1 | $ | 18,470 |  |  | $ | — |  |  | $ | — |
Customer 2 | 10,472 |  |  | — |  |  | — |
Customer 3 | 4,335 |  |  | — |  |  | — |
Customer 4 | 2,848 |  |  | 2,592 |  |  | 1,385 |
Customer 5 | 866 |  |  | 8,778 |  |  | — |
Customer 6 | — |  |  | 445 |  |  | 1,571 |
The Company’s revenues by country of customer are as follows:
| Years Ended December 31,
| 2023 |  | 2022 |  | 2021
U.S. | $ | 34,514 |  |  | $ | 9,473 |  |  | $ | 1,721 |
Estonia | 2,848 |  |  | 2,592 |  |  | 1,385 |
Other | 566 |  |  | 450 |  |  | 78 |
Total revenues | $ | 37,928 |  |  | $ | 12,515 |  |  | $ | 3,184 |
The Company’s outstanding trade receivables from its major customers are as follows:
| December 31,
| 2023 |  | 2022
Customer 1 | $ | 291 |  |  | $ | — |
The Company’s outstanding trade receivables by country of customer are as follows:
| December 31,
| 2023 |  | 2022
U.S. | $ | 115 |  |  | $ | 92 |
Estonia | 291 |  |  | — |
Total trade receivables | $ | 406 |  |  | $ | 92 |
Schedule of Other Nonoperating Income (Expense) | The components of other income (loss) are as follows:
| Years Ended December 31,
| 2023 |  | 2022 |  | 2021
Unrealized gain (loss) on investments | $ | 15,472 |  |  | $ | (16,808) |  |  | $ | 6,311 |
Realized loss on investments | (10,491) |  |  | — |  |  | — |
Unrealized gain (loss) on marketable securities | (530) |  |  | (456) |  |  | 795 |
Realized gain on maturities of marketable securities | 1,141 |  |  | — |  |  | — |
Realized gain on convertible note | 1,430 |  |  | — |  |  | — |
Change in value of warrant liabilities | — |  |  | — |  |  | (8,078) |
Foreign exchange gain (loss) | 423 |  |  | 2,058 |  |  | (128) |
Department of Energy awards | — |  |  | — |  |  | 1,900 |
Interest income, net and other | 5,697 |  |  | (166) |  |  | 340 |
Other income (loss) | $ | 13,142 |  |  | $ | (15,372) |  |  | $ | 1,140 |
Schedule of Accounts Payable and Accrued Liabilities | The components of accounts payable and accrued liabilities are as follows:
| December 31,
| 2023 |  | 2022
Accounts payable | $ | 1,006 |  |  | $ | 1,850 |
Accrued operating expenses | 4,391 |  |  | 1,783 |
Accrued payroll liabilities | 4,162 |  |  | 2,929 |
Accrued capital expenditures | 205 |  |  | 22 |
Accrued taxes | 393 |  |  | 240 |
Other accrued liabilities | 4 |  |  | 105 |
Total accounts payable and accrued liabilities | $ | 10,161 |  |  | $ | 6,929 |

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