| 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 |
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| Net loss | - | - | - | - | - | - | - | -22 | -18 | -17 | -16 | -29 | -21 |
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| Depreciation | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 0 | 0 | 0 | 3 |
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| Provision for bad debts | - | 0 | 0 | 1 | 0 | -0 | 0 | 0 | 2 | 1 | -0 | 0 | 1 |
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| Inventory Excess And Obsolescence | - | - | - | - | - | - | - | - | - | - | - | - | 1 |
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| Inventory Write-down | - | 0 | 1 | 1 | 1 | 0 | 1 | 0 | 0 | -1 | -0 | 1 | - |
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| Amortization of debt issuance costs | 0 | 0 | 0 | 0 | - | - | - | 0 | 0 | 0 | 0 | 1 | 0 |
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| Patent litigation mark-to-market | - | - | - | - | - | - | - | - | - | - | 0 | - | - |
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| Change in fair value of warrants | - | - | - | - | - | - | - | - | - | -6 | - | - | -0 |
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| Issuance Of Restricted Shares | - | - | - | - | - | - | - | - | - | - | 0 | 0 | - |
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| Issuance costs for warrants | - | - | - | - | - | - | - | - | - | 2 | - | - | 0 |
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| Stock-based compensation | 2 | 2 | 2 | 1 | - | 3 | 2 | 3 | 3 | 3 | 2 | 2 | 1 |
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| Gain on debt forgiveness | -0 | - | - | - | - | - | - | - | - | - | 3 | - | - |
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| Gain on disposal of fixed assets | - | - | - | - | - | - | - | - | - | - | - | - | 0 |
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| Accounts receivable | 6 | 3 | -0 | -1 | 0 | 1 | 0 | 1 | -1 | -4 | 1 | 2 | -0 |
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| Inventory | 5 | 0 | 1 | 2 | 1 | 2 | -0 | 0 | -1 | 1 | 1 | 6 | -1 |
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| Prepaid expenses and other current assets | 1 | -0 | -0 | 0 | 0 | -0 | 0 | 0 | -0 | -1 | -0 | 1 | -2 |
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| Accounts payable and accrued liabilities | 4 | -0 | -1 | 0 | -1 | 3 | -5 | 2 | -3 | -2 | 2 | 4 | -2 |
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| Deferred revenue | - | - | - | - | - | - | - | -0 | 0 | -0 | 0 | -0 | 0 |
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| Net cash and cash equivalents used in operating activities | -13 | -2 | -9 | - | - | - | - | -14 | -13 | -13 | -17 | -27 | -14 |
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| Purchases of property, plant, and equipment | 0 | 1 | 1 | 0 | 2 | 1 | 1 | 1 | 0 | 0 | 1 | 4 | 1 |
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| Proceeds from Sale of Property, Plant, and Equipment | - | - | - | - | 0 | - | - | 0 | - | - | - | - | 0 |
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| Net cash and cash equivalents used in investing activities | -0 | -1 | -1 | - | - | - | - | -1 | -0 | -0 | -1 | -4 | -1 |
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| Gross proceeds | 17 | - | 5 | 51 | - | 10 | - | - | 9 | - | - | 6 | 10 |
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| Proceeds from the sale of Convertible Preferred Stock, net of fees | - | - | - | - | - | - | - | - | - | - | - | - | 5 |
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| Proceeds From Sale Of Common Stock Warrants | - | - | - | - | - | - | - | - | - | - | - | - | 2 |
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| Principal payment on loan | - | - | - | - | - | - | - | - | - | - | - | 1 | 0 |
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| Payments of equity offering costs | - | - | - | - | - | - | - | 0 | - | 1 | 1 | - | - |
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| Payments of debt issuance costs | - | 0 | 0 | 0 | - | - | - | 1 | 0 | 0 | 0 | - | - |
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| Proceeds from Warrant Exercises | 0 | 0 | - | - | - | - | - | - | - | 0 | 17 | 0 | 0 |
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| Procees from the exercise of preferred share warrants | - | - | - | - | - | - | - | - | - | - | - | - | 1 |
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| Proceeds from exercise of stock options | - | - | - | - | - | - | - | 0 | 0 | - | 0 | - | - |
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| Net cash and cash equivalents provided by financing activities | 15 | 2 | 9 | - | - | - | - | 11 | 11 | 24 | 30 | 5 | 17 |
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| Effect of exchange rate changes | - | - | - | - | - | - | - | - | - | - | - | -0 | 0 |
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| Increase (decrease) in cash and cash equivalents | - | - | - | - | - | - | - | -4 | -2 | 12 | 12 | -26 | 2 |
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| Cash paid for interest | - | - | - | - | - | - | - | 0 | 2 | 2 | 2 | 2 | 2 |
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| Cash received for interest | - | - | - | - | - | - | - | - | - | 0 | 0 | 0 | 0 |
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| Income Taxes Paid, Net | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
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| Cash paid for operating leases | - | - | - | - | - | - | - | - | - | - | 0 | 0 | 0 |
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| Non-cash settlement of liability | - | - | - | - | - | - | - | - | - | - | 1 | - | - |
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| Non Cash Right Of Use Assets Obtained In Exchange For Lease Obligation | - | - | - | - | - | - | - | - | - | - | 0 | 1 | 0 |
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| Dividends, Preferred Stock, Stock | - | - | - | - | - | - | - | - | - | 17 | 1 | 0 | - |
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| Forgiveness of debt | - | - | - | - | - | - | - | - | - | 0 | - | - | - |
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| Receivable From WarrantsExercised And Included In Prepaid And Other Current Assets | - | - | - | - | - | - | - | - | - | - | -1 | - | - |
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| Non-cash property, plant and equipment additions acquired under inventory | - | - | - | - | - | - | - | - | - | - | - | - | 3 |
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| Common stock issued upon exercise of preferred stock | - | - | - | - | - | - | - | - | - | - | - | - | 22 |
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| Debt Conversion, Converted Instrument, Amount | - | - | - | - | - | - | - | 1 | 0 | 0 | - | - | - |
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