| Disposal Groups, Including Discontinued Operations [Table Text Block] |
| | | Three Months Ended | | | Six Months Ended | |
| | | June 28, | | | June 29, | | | June 28, | | | June 29, | |
| | | 2026 | | | 2025 | | | 2026 | | | 2025 | |
| Revenue | | $ | — | | | $ | — | | | $ | — | | | $ | 11 | |
| Cost of revenue | | | — | | | | — | | | | — | | | | 3 | |
| Gross profit (loss) | | | — | | | | — | | | | — | | | | 8 | |
| Operating expenses: | | | | | | | | | | | | | | | | |
| Research and development | | | 4 | | | | 9 | | | | 8 | | | | 18 | |
| Selling, general and administrative | | | — | | | | — | | | | — | | | | 13 | |
| Restructuring costs | | | — | | | | — | | | | — | | | | 87 | |
| Income (loss) from discontinued operations before income taxes | | | (4 | ) | | | (9 | ) | | | (8 | ) | | | (110 | ) |
| (Benefit from) provision for income taxes | | | 1 | | | | — | | | | 1 | | | | — | |
| Net income (loss) from discontinued operations | | $ | (5 | ) | | $ | (9 | ) | | $ | (9 | ) | | $ | (110 | ) |
| Net income (loss) from discontinued operations per share: | | | | | | | | | | | | | | | | |
| Basic | | $ | (0.00 | ) | | $ | (0.00 | ) | | $ | (0.00 | ) | | $ | (0.01 | ) |
| Diluted | | $ | (0.00 | ) | | $ | (0.00 | ) | | $ | (0.00 | ) | | $ | (0.01 | ) |
| Weighted average shares outstanding: | | | | | | | | | | | | | | | | |
| Basic | | | 18,110 | | | | 15,884 | | | | 17,788 | | | | 15,677 | |
| Diluted | | | 18,110 | | | | 15,884 | | | | 17,788 | | | | 15,677 | |
| | | Three Months Ended | | | Six Months Ended | |
| | | June 28, 2026 | | | June 29, 2025 | | | June 28, 2026 | | | June 29, 2025 | |
| New products | | $ | — | | | $ | — | | | $ | — | | | $ | 11 | |
| Total revenue | | $ | — | | | $ | — | | | $ | — | | | $ | 11 | |
| | | Three Months Ended | | | Six Months Ended | |
| | | June 28, 2026 | | | June 29, 2025 | | | June 28, 2026 | | | June 29, 2025 | |
| Asia Pacific | | $ | — | | | $ | — | | | $ | — | | | $ | 4 | |
| North America | | | — | | | | — | | | | — | | | | 6 | |
| Europe | | | — | | | | — | | | | — | | | | 1 | |
| Total revenue | | $ | — | | | $ | — | | | $ | — | | | $ | 11 | |
| | | Three Months Ended | | | Six Months Ended | |
| | | June 28, | | | June 29, | | | June 28, | | | June 29, | |
| | | 2026 | | | 2025 | | | 2026 | | | 2025 | |
| Customer "L" | | | * | | | | * | | | | * | | | | 50 | % |
| Customer "O" | | | * | | | | * | | | | * | | | | 34 | % |
| | | Three Months Ended | | | Six Months Ended | |
| | | June 28, 2026 | | | June 29, 2025 | | | June 28, 2026 | | | June 29, 2025 | |
| Operating lease costs from discontinued operations: | | | | | | | | | | | | | | | | |
| Fixed | | $ | — | | | $ | — | | | $ | — | | | $ | 4 | |
| Total | | $ | — | | | $ | - | | | $ | — | | | $ | 4 | |
| | | Three Months Ended | | | Six Months Ended | |
| | | June 28, 2026 | | | June 29, 2025 | | | June 28, 2026 | | | June 29, 2025 | |
| Cost of revenue | | $ | — | | | $ | — | | | $ | — | | | $ | — | |
| Research and development | | | — | | | | — | | | | — | | | | (32 | ) |
| Selling, general and administrative | | | — | | | | — | | | | — | | | | — | |
| Total | | $ | — | | | $ | — | | | $ | — | | | $ | (32 | ) |
| | | Six Months Ended | |
| | | June 28, | | | June 29, | |
| | | 2026 | | | 2025 | |
| Net cash provided by (used in) operating activities from discontinued operations | | $ | (9 | ) | | $ | (192 | ) |
| Net cash provided by (used in) investing activities from discontinued operations | | | - | | | | - | |
| Net cash provided by (used in) financing activities from discontinued operations | | | 7 | | | | 178 | |
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