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Property and Equipment - Long-lived assets (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Jan. 01, 2022
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Long-lived assets by geographic location |  |
Long-lived assets (property and equipment, net) | $ 45,582 | $ 53,612
United States |  |
Long-lived assets by geographic location |  |
Long-lived assets (property and equipment, net) | 38,495 | 44,340
United Kingdom |  |
Long-lived assets by geographic location |  |
Long-lived assets (property and equipment, net) | 4,943 | 6,491
Other |  |
Long-lived assets by geographic location |  |
Long-lived assets (property and equipment, net) | $ 2,144 | $ 2,781

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