| Dec 31, 2016 | Dec 31, 2017 | Dec 31, 2018 | Dec 31, 2019 | Dec 31, 2020 | Dec 31, 2021 | Dec 31, 2022 | Dec 31, 2023 | Dec 31, 2024 |
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| Cash and cash equivalents | - | - | - | 61 | 98 | 110 | 76 | 6 | 7 |
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| Other receivables | - | - | - | 0 | 0 | 0 | 0 | - | 0 |
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| Prepaid expenses and other current assets | - | - | - | 2 | 2 | 2 | 3 | 1 | 0 |
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| Property, plant and equipment, held for sale | - | - | - | - | - | - | - | - | 1 |
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| Total current assets | 27 | 61 | 35 | 63 | 100 | 112 | 79 | 11 | 9 |
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| Property, plant and equipment, net | - | - | - | - | - | - | - | - | 0 |
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| Restricted cash | - | 1 | 1 | 1 | 1 | 1 | 1 | 1 | - |
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| Other assets | - | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 0 |
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| Operating Lease, Right-of-Use Asset | - | - | - | 1 | 1 | 1 | 3 | 2 | 0 |
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| Total Assets | 27 | 63 | 43 | 73 | 110 | 125 | 92 | 18 | 9 |
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| Accounts payable and accrued expenses | 1 | 3 | 5 | 6 | 9 | 10 | 14 | 14 | 9 |
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| Other Liabilities, Current | - | - | - | - | - | - | - | - | 3 |
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| Operating Lease, Liability, Current | - | - | - | 0 | 0 | 0 | 1 | 1 | 0 |
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| Total current liabilities | 3 | 4 | 6 | 8 | 10 | 11 | 15 | 15 | 13 |
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| Deferred income | - | - | - | - | - | 0 | 0 | 0 | 0 |
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| Operating Lease, Liability, Noncurrent | - | - | - | 2 | 2 | 2 | 3 | 2 | 0 |
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| Total Liabilities | 3 | 4 | 6 | 22 | 11 | 13 | 46 | 18 | 13 |
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| Preferred Stock, Value, Issued | - | - | - | - | - | - | - | - | - |
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| Class A common shares | - | - | - | - | - | - | - | - | - |
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| Common shares | - | - | - | - | - | 0 | 0 | 0 | 0 |
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| Common Stock, Value, Issued | 0 | 0 | 0 | 0 | 0 | - | - | - | - |
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| Common Stock, Value, Subscriptions | 4 | 10 | 2 | 5 | 8 | 4 | 1 | 1 | 1 |
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| Additional paid-in capital | 37 | 99 | 113 | 172 | 276 | 360 | 375 | 381 | 392 |
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| Accumulated deficit | -17 | -48 | -79 | -125 | -185 | -252 | -329 | -381 | -397 |
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| Class A common shares | - | - | - | - | - | - | - | - | - |
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| Common shares | - | - | - | 0 | 0 | 0 | 0 | 0 | 0 |
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| Total Stockholders' Equity | 24 | 60 | 36 | 52 | 98 | 112 | 46 | 0 | -4 |
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| Total Liabilities and Stockholders' Equity | 27 | 63 | 43 | 73 | 110 | 125 | 92 | 18 | 9 |
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