| 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 |
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Cash and cash equivalents | 32 | 47 | 36 | 11 | 11 | 42 | 93 | 105 | 46 |
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Short-term investments | - | - | 23 | - | - | - | - | - | 28 |
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Prepaid expenses and other current assets | 1 | 1 | 1 | 1 | 7 | 4 | 5 | 4 | 3 |
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Accounts receivable, net | 1 | - | - | - | - | - | - | 1 | 2 |
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Inventory, net | - | - | - | - | - | - | - | 0 | 1 |
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Restricted cash | - | - | - | - | 0 | - | - | - | 0 |
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Total current assets | 35 | 48 | 59 | 45 | 51 | 52 | 98 | 109 | 79 |
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Other assets | 0 | 0 | 0 | 1 | 1 | 1 | 1 | 6 | 6 |
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Deferred offering costs | - | - | - | - | 0 | 0 | 0 | 0 | 0 |
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Restricted cash | - | - | - | - | 0 | 0 | 0 | 0 | 0 |
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Intangible assets, net | - | - | - | - | - | - | - | 1 | 0 |
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Operating Lease, Right-of-Use Asset | - | - | - | - | - | 3 | 3 | 3 | 3 |
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Total assets | 40 | 49 | 60 | 46 | 53 | 57 | 103 | 120 | 88 |
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Accounts payable | 1 | 1 | 2 | 4 | 4 | 7 | 5 | 8 | 6 |
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Accrued expenses | 2 | 3 | 1 | 2 | 2 | 4 | 4 | 6 | 6 |
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Other Liabilities, Current | - | - | - | - | - | - | - | - | 6 |
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Operating Lease, Liability, Current | - | - | - | - | - | 0 | 0 | 0 | 0 |
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Total current liabilities | 4 | 7 | 4 | 10 | 6 | 11 | 26 | 14 | 18 |
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Other liabilities | - | - | - | - | - | - | - | 3 | - |
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Warrant liabilities | - | - | 7 | 4 | 1 | 18 | 34 | 18 | 19 |
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Convertible Debt And Derivative Liability | - | - | - | - | - | 12 | 17 | 12 | 11 |
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Loan payable (Note 8) | - | - | - | - | - | - | - | 29 | 34 |
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Operating lease liability (Note 9) | - | - | - | - | - | 3 | 3 | 3 | 3 |
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Total liabilities | 6 | 7 | 25 | 24 | 22 | 44 | 80 | 79 | 85 |
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Commitments and contingencies | - | - | - | - | - | - | - | - | - |
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Preferred Stock, Value, Outstanding | - | - | - | - | - | - | - | - | - |
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Common Stock, Value, Outstanding | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
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Additional paid-in capital | 151 | 192 | 215 | 227 | 249 | 284 | 349 | 401 | 425 |
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Accumulated deficit | -118 | -150 | -180 | -205 | -218 | -271 | -327 | -359 | -422 |
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Total stockholders’ equity | 33 | 42 | 35 | 21 | 31 | 13 | 23 | 41 | 3 |
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Total liabilities and stockholders’ equity | 40 | 49 | 60 | 46 | 53 | 57 | 103 | 120 | 88 |
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