| 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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Cash and cash equivalents | - | - | - | - | - | - | 17 | 47 | 15 | 26 | 28 |
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Short-term investments, available-for-sale | - | - | - | - | - | - | - | - | - | 191 | 155 |
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Accounts receivable | 0 | 0 | 2 | 2 | 2 | 0 | 1 | 0 | - | 1 | 0 |
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Inventories | - | - | - | - | - | - | - | - | 3 | - | - |
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Prepaid expenses and other current assets | 3 | 3 | 6 | 3 | 3 | 3 | 3 | 2 | 5 | 10 | 6 |
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Prepaid expenses and other current assets | 3 | 3 | 6 | 3 | 3 | 3 | 3 | 2 | 5 | 10 | 6 |
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Total current assets | 113 | 237 | 229 | 236 | 157 | 189 | 118 | 82 | 96 | 228 | 189 |
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Total current assets | 113 | 237 | 229 | 236 | 157 | 189 | 118 | 82 | 96 | 228 | 189 |
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Long-term investments | - | 53 | - | - | - | - | - | - | 2 | 49 | - |
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Long-term investments | - | - | - | - | - | - | - | - | - | - | 22 |
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Property, Plant and Equipment, Net | 0 | 1 | 3 | 3 | 2 | 1 | 1 | 0 | 0 | 0 | 0 |
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Operating lease right-of-use assets | - | - | - | - | - | - | 1 | 3 | 2 | 2 | 1 |
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Other long-term assets | - | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
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Total assets | 113 | 292 | 356 | 287 | 235 | 191 | 119 | 85 | 101 | 279 | 213 |
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Accounts payable | 2 | 6 | 10 | 4 | 4 | 5 | 2 | 1 | 3 | 3 | 3 |
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Accrued liabilities | 2 | 7 | 10 | 6 | 9 | 8 | 7 | 7 | 13 | 17 | 16 |
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Note payable | - | - | - | - | - | - | - | - | 14 | - | - |
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Total current liabilities | 10 | 17 | 20 | 10 | 13 | 13 | 9 | 9 | 30 | 20 | 18 |
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Total current liabilities | 10 | 17 | 20 | 10 | 13 | 13 | 9 | 9 | 30 | 20 | 18 |
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Loan Fees | - | - | - | - | - | - | - | - | - | 0 | - |
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Line of credit commitment fee | - | - | - | - | - | - | - | - | - | - | 0 |
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Lease-related obligations | - | - | - | - | - | - | - | 3 | 2 | 2 | 1 |
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Total liabilities | 15 | 17 | 21 | 11 | 13 | 13 | 9 | 11 | 32 | 22 | 20 |
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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 | - | 497 | 676 | 692 | 710 | 734 | 779 | 786 | 954 | 971 | 988 |
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Accumulated other comprehensive gain (loss), net | - | 0 | -1 | -0 | -1 | -0 | 0 | - | -0 | -0 | 0 |
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Accumulated deficit | -163 | -222 | -339 | -416 | -487 | -556 | -669 | -712 | -886 | -713 | -796 |
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Total stockholders’ equity | 99 | 275 | 335 | 276 | 222 | 178 | 110 | 73 | 68 | 257 | 193 |
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Total liabilities and stockholders’ equity | 113 | 292 | 356 | 287 | 235 | 191 | 119 | 85 | 101 | 279 | 213 |
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