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Commitments and Contingencies - Schedule of Leases its Facilities Under Non-Cancelable Operating Lease Agreements (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 28, 2025 | Sep. 29, 2024 | Dec. 31, 2024 | Dec. 29, 2024 | Dec. 31, 2023
Finance lease cost: |  |  |  |  |
Amortization of right-of-use assets |  |  |  | $ 553 |
Interest on lease liabilities |  |  |  | 77 |
Lease cost |  |  |  | 630 |
Operating lease cost |  |  |  | 1,003 | 1,380
Variable lease cost |  |  |  |  | 342
Total lease cost |  |  |  | 1,633 | 1,722
Cash paid for amounts included in the measurement of lease liabilities |  |  |  |  |
Finance leases | $ 1,528 |  | $ 551 | 551 |
Operating leases |  |  |  | $ 1,039 | $ 1,047
Weighted-average remaining lease term (in years): |  |  |  |  |
Finance leases |  |  |  | 2 years |
Operating leases |  |  |  | 2 years 6 months | 2 years 5 months 23 days
Weighted-average discount rate: |  |  |  |  |
Finance Leases |  |  |  | 7.00% |
Operating leases |  |  |  | 9.50% | 15.57%

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