| Dec 30, 2011 | Dec 28, 2012 | 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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| Net income (loss) | 1 | -2 | 0 | -8 | -7 | -12 | -2 | 5 | 14 | 6 | 25 | 39 | 21 | -20 |
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| Depreciation | 1 | 1 | 2 | 2 | 2 | 3 | 3 | 2 | 4 | 3 | 4 | 4 | 5 | 7 |
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| Amortization of intangibles | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | - |
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| Impairment of intangibles | - | - | - | - | - | - | - | - | - | - | - | - | 0 | - |
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| Accretion/amortization of investments available for sale | - | - | - | - | - | - | - | - | - | - | - | -1 | -3 | -1 |
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| Deferred income taxes | 0 | 0 | - | -1 | 0 | -1 | -1 | 0 | -3 | -1 | 1 | -1 | 3 | 4 |
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| Change in net pension liability | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | -1 | 0 |
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| Loss on disposal of property and equipment | - | -0 | -0 | - | - | -0 | -1 | -0 | -0 | -0 | -0 | -0 | -0 | -2 |
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| Stock-based compensation expense | 2 | 3 | 4 | 5 | 3 | 9 | 3 | 7 | 11 | 12 | 15 | 20 | 24 | 27 |
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| Change in asset retirement obligation | - | - | - | - | - | - | - | - | - | - | - | - | -0 | -0 |
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| Provision for sales returns and credit losses | - | - | - | 0 | 0 | 0 | 0 | 1 | 0 | 1 | 0 | 1 | 1 | 0 |
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| Inventory provision | - | - | - | - | - | - | - | 1 | 2 | 2 | 2 | 2 | 5 | 3 |
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| Accounts receivable | 0 | -0 | 3 | 1 | 5 | 1 | 2 | 6 | 5 | 4 | 9 | 20 | 33 | -16 |
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| Inventories | 0 | 1 | 2 | 4 | -0 | -2 | -0 | 4 | 1 | 1 | -0 | 8 | 14 | 10 |
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| Prepayments, deposits, and other assets | - | - | - | - | - | - | - | - | - | - | - | - | 3 | 15 |
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| Accounts payable | 0 | 1 | 0 | 1 | 0 | 1 | -3 | 0 | 1 | -1 | 0 | 2 | -1 | 0 |
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| Other current liabilities | -0 | -0 | 1 | -1 | 1 | 1 | 0 | 6 | 4 | 7 | 7 | -1 | 10 | 3 |
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| Net cash provided by operating activities | 5 | 3 | - | - | - | - | 3 | 13 | 26 | 21 | 44 | 36 | 15 | 16 |
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| Acquisition of property and equipment | 1 | 2 | 3 | 4 | 2 | 3 | 1 | 2 | 10 | 8 | 14 | 18 | 18 | 23 |
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| Purchase of investments available for sale | - | - | - | - | - | - | - | - | - | - | - | 156 | 52 | 80 |
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| Proceeds from maturity of investments available for sale | - | - | - | - | - | - | - | - | - | - | - | - | - | 43 |
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| Proceeds from sale or maturity of investments available for sale | - | - | - | - | - | - | - | - | - | - | - | 17 | 145 | - |
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| Proceeds from sale of investments available for sale | - | - | - | - | - | - | - | - | - | - | - | - | - | 1 |
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| Net cash provided by (used in) investing activities | -1 | -2 | - | - | - | - | -1 | -2 | -10 | -8 | -14 | -156 | 74 | -59 |
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| Repayment of finance lease obligations | - | - | - | - | - | - | - | - | 1 | 1 | 0 | 0 | 0 | 0 |
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| Repayment of line of credit | - | - | - | - | - | - | - | 1 | 2 | 1 | 1 | - | - | - |
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| Repurchase of employee common stock for taxes withheld | - | - | - | - | - | 1 | 0 | 0 | - | - | - | - | 2 | 2 |
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| Proceeds from Stock Options Exercised | 3 | 2 | 3 | 3 | 2 | 2 | - | 5 | 3 | 21 | 19 | 8 | 10 | 7 |
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| Proceeds from vested restricted stock | - | - | - | - | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
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| Net cash provided by financing activities | 3 | 4 | - | - | - | - | 2 | 75 | 0 | 20 | 18 | 8 | 7 | 6 |
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| Effect of exchange rate changes on cash and cash equivalents | - | - | - | - | - | - | - | 0 | 0 | 0 | -1 | -1 | 0 | -1 |
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| Increase (decrease) in cash and cash equivalents | - | - | - | - | - | - | 5 | 85 | 16 | 32 | 47 | -113 | 97 | -39 |
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