| Dec 31, 2011 | Dec 31, 2012 | Dec 31, 2013 | Dec 31, 2014 | Dec 31, 2015 | 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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| Net loss | -17 | -20 | -23 | -19 | -24 | -26 | -34 | -26 | -30 | -38 | -31 | -25 | -31 | -31 |
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| Depreciation | - | - | - | - | - | - | - | - | - | - | 0 | 1 | 1 | 1 |
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| Amortization of debt discount and issuance costs | 2 | 3 | 1 | 1 | 2 | 4 | - | - | 4 | 0 | 3 | 2 | 0 | 1 |
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| Amortization of right-of-use asset | - | - | - | - | - | - | - | - | - | - | 0 | 0 | 0 | 0 |
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| Interest expense added to loan principal | - | - | - | - | - | 8 | 9 | 10 | 10 | 7 | 4 | - | 1 | 2 |
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| Interest expense added to lease liability | - | - | - | - | - | 1 | 1 | 1 | 1 | 1 | 2 | 2 | 2 | 2 |
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| Finance Expense | - | - | - | - | - | - | - | -2 | - | -0 | -1 | - | 0 | 0 |
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| Loss on early extinguishment of debt | - | - | - | - | - | - | - | - | - | -12 | -1 | - | -5 | - |
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| Compensation charge for stock and share option awards | 2 | 0 | 1 | 1 | 1 | 1 | 2 | 0 | 1 | 2 | 5 | 2 | 1 | 5 |
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| Unrealized loss on derivative liabilities | -0 | - | - | - | - | - | - | - | - | - | - | - | - | - |
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| Accounts receivable | 0 | 0 | 0 | -0 | -0 | -0 | -0 | 0 | 0 | 0 | 0 | 0 | 0 | 4 |
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| Inventories | - | - | - | - | - | - | - | - | - | - | - | - | 2 | 1 |
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| Prepaid expenses and other current assets | -0 | -0 | -0 | -0 | -0 | 3 | -3 | -0 | -0 | 0 | 0 | -0 | 0 | 0 |
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| Other assets | 0 | 0 | 3 | 0 | 0 | 0 | 0 | -0 | 0 | 1 | -0 | 1 | 0 | -0 |
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| Accounts payable | 0 | 0 | 0 | -1 | 0 | 0 | -0 | -0 | -0 | 0 | -0 | 0 | 1 | -0 |
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| Lease liabilities | - | - | - | - | - | - | - | - | - | - | - | - | -0 | -0 |
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| Deferred revenue | 1 | 0 | - | - | - | - | - | - | - | - | - | - | 0 | 1 |
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| Other accrued liabilities | - | - | - | - | - | - | - | - | - | - | - | - | 0 | 2 |
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| Net cash used in operating activities | -8 | -11 | -16 | -10 | -13 | -10 | -10 | -12 | -14 | -13 | -15 | -19 | -21 | -21 |
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| Additions to property, plant and equipment and water programs | 4 | 3 | 0 | 0 | 1 | - | 1 | 2 | 2 | 6 | 23 | 3 | 6 | 1 |
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| Payments for contingent consideration liabilities | - | - | - | - | - | - | - | - | - | - | - | - | - | 0 |
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| Net cash used in investing activities | -4 | -3 | -0 | -0 | -1 | - | -1 | -4 | -3 | -10 | -23 | -4 | -6 | -1 |
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| Net proceeds from issuance of common stock | 15 | - | - | 15 | - | 11 | - | 16 | 19 | 15 | 32 | 22 | 38 | 22 |
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| Dividend payment | - | - | - | - | - | - | - | - | - | - | 1 | 6,555,000 | 11,661,000 | 16,767,000 |
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| Proceeds from the issuance of long-term debt | - | - | - | - | - | - | - | - | - | 0 | 50 | 0 | 0 | 20 |
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| Issuance costs of long-term debt | - | - | 1 | - | - | 1 | - | - | - | - | 3 | - | 0 | 1 |
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| Principal payments on long-term debt | 0 | 0 | 0 | 0 | 0 | 11 | 45 | 0 | 0 | 0 | 78 | 0 | 15 | 0 |
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| Costs for extinguishment of debt | - | - | - | - | - | - | - | - | - | - | 3 | - | 1 | - |
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| Taxes paid related to net share settlement of equity awards | - | - | - | - | - | - | - | - | - | - | 1 | - | 0 | 0 |
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| Net cash provided by financing activities | 17 | 5 | 26 | 15 | -0 | 19 | 12 | 15 | 19 | 15 | 51 | 17 | 18 | 36 |
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| Net (decrease) increase in cash, cash equivalents and restricted cash | - | - | - | - | - | - | - | -0 | 3 | -8 | 12 | -6 | -9 | 13 |
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