| Dec 30, 2011 | Jan 3, 2014 | Jan 2, 2015 | Jan 1, 2016 | Dec 30, 2016 | Dec 29, 2017 | Dec 28, 2018 | Jan 3, 2020 | Jan 1, 2021 | Dec 31, 2021 | Dec 30, 2022 | Dec 29, 2023 | Dec 27, 2024 |
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| Cash and cash equivalents | 17 | 23 | 13 | 13 | 14 | 19 | 104 | 120 | 152 | 200 | 86 | 183 | 144 |
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| Short-Term Investments | - | - | - | - | - | - | - | - | - | - | 125 | 38 | 86 |
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| Accounts Receivable, after Allowance for Credit Loss, Current | 9 | 11 | 11 | 16 | 16 | 18 | 26 | 31 | 35 | 44 | 62 | 95 | 78 |
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| Inventories, net | - | - | - | 16 | 15 | 13 | 17 | 17 | 18 | 17 | 24 | 35 | 43 |
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| Prepayments, deposits and other current assets | 2 | 4 | 5 | 4 | 4 | 4 | 5 | 7 | 11 | 11 | 13 | 15 | 16 |
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| Total current assets | 39 | 50 | 45 | 49 | 50 | 54 | 152 | 175 | 216 | 271 | 312 | 365 | 368 |
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| Long-Term Investments | - | - | - | - | - | - | - | - | - | - | 14 | 12 | - |
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| Property, plant and equipment, net | 4 | 7 | 10 | 10 | 12 | 10 | 11 | 17 | 24 | 36 | 51 | 67 | 85 |
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| Finance lease right-of-use assets, net | - | - | - | - | - | - | - | 2 | 1 | 1 | 0 | 0 | 0 |
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| Operating Lease, Right-of-Use Asset | - | - | - | - | - | - | - | 7 | 9 | 31 | 30 | 34 | 37 |
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| Intangible assets, net | 3 | 1 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | - | - |
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| Goodwill | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 |
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| Deferred income taxes | - | - | - | - | - | - | - | - | 5 | 4 | 5 | 5 | 1 |
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| Other assets | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 3 | 17 |
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| Total assets | 49 | 62 | 59 | 63 | 65 | 68 | 167 | 207 | 257 | 346 | 415 | 489 | 510 |
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| Accounts payable | 4 | 6 | 7 | 7 | 8 | 6 | 7 | 8 | 8 | 9 | 12 | 14 | 17 |
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| Obligations under finance leases | - | - | - | - | - | - | - | 1 | 0 | 0 | 0 | 0 | 0 |
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| Obligations under operating leases | - | - | - | - | - | - | - | 3 | 2 | 3 | 4 | 4 | 4 |
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| Allowance for sales returns | - | - | - | - | - | - | 3 | 4 | 5 | 5 | 6 | 6 | 7 |
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| Other current liabilities | 6 | 6 | 5 | 6 | 7 | 7 | 13 | 18 | 25 | 32 | 31 | 41 | 43 |
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| Total current liabilities | 14 | 18 | 16 | 18 | 21 | 19 | 28 | 34 | 41 | 49 | 52 | 65 | 70 |
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| Obligations under finance leases | - | - | - | - | - | - | - | 0 | 0 | 0 | 0 | 0 | - |
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| Obligations under operating leases | - | - | - | - | - | - | - | 4 | 7 | 28 | 27 | 31 | 35 |
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| Deferred income taxes | - | - | - | - | - | - | - | - | 0 | 1 | 1 | 1 | 0 |
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| Asset retirement obligations | - | 0 | 0 | 0 | 0 | 0 | 206,000 | 211,000 | 221,000 | 198,000 | 220,000 | 103,000 | 42,000 |
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| Pension liability | - | 3 | 3 | 4 | 4 | 5 | 5 | 8 | 12 | 9 | 2 | 5 | 7 |
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| Total liabilities | 20 | 23 | 22 | 24 | 28 | 25 | 35 | 47 | 60 | 87 | 83 | 103 | 112 |
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| Common Stock, Value, Issued | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
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| Additional paid-in capital | - | 170 | 178 | 187 | 198 | 205 | 290 | 304 | 338 | 374 | 404 | 437 | 471 |
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| Accumulated other comprehensive income (loss) | 2 | 0 | -1 | -2 | -1 | -1 | -1 | -3 | -6 | -4 | 0 | -4 | -7 |
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| Accumulated deficit | -131 | -132 | -140 | -147 | -159 | -161 | -156 | -142 | -136 | -111 | -73 | -47 | -68 |
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| Total stockholders’ equity | 29 | 39 | 37 | 39 | 38 | 43 | 132 | 160 | 197 | 259 | 332 | 386 | 397 |
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| Total liabilities and stockholders’ equity | 49 | 62 | 59 | 63 | 65 | 68 | 167 | 207 | 257 | 346 | 415 | 489 | 510 |
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