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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 28, 2024
Mar. 30, 2024
Sep. 30, 2023
Apr. 01, 2023
Sep. 28, 2024
Sep. 30, 2023
Dec. 31, 2023
Cash flows from operating activities:              
Net loss $ (26,576) $ (54,361) $ (70,492) $ (59,037) $ (115,416) $ (183,034)  
Adjustments to reconcile net loss to net cash used in operating activities:              
Depreciation and amortization 5,300   5,800   17,464 17,707  
Non-cash lease expense         6,198 5,997  
Share-based compensation expense         17,753 23,791  
Provision for doubtful accounts         232 0  
Loss on sale of fixed assets 100   100   493 3,876  
Amortization of debt issuance costs         2,951 2,951  
Equity in losses of unconsolidated joint venture 38   126   61 3,864  
Write-off of note receivable         0 3,795  
Unrealized (gain) loss on foreign currency transactions         (1,118) 2,740  
Net change in operating assets and liabilities:              
Accounts receivable         (2,977) (1,806)  
Inventories         5,361 40,470  
Prepaid expenses and other current assets         144 1,282  
Accounts payable         (797) 8,335  
Accrued expenses and other current liabilities         7,135 (2,752)  
Prepaid lease costs, non-current         (4,933) (3,254)  
Operating lease liabilities         (2,412) (3,244)  
Net cash used in operating activities         (69,861) (79,282)  
Cash flows from investing activities:              
Purchases of property, plant and equipment         (4,540) (8,567)  
Proceeds from sale of fixed assets         4,093 2,477  
Payments for investment in joint venture         0 (3,250)  
Return of security deposits         437 0  
Net cash used in investing activities         (10) (9,340)  
Cash flows from financing activities:              
Principal payments under finance lease obligations         (683) (168)  
Proceeds from exercise of stock options         18 171  
Payments of minimum withholding taxes on net share settlement of equity awards         (617) (391)  
Net cash used in financing activities         (1,282) (388)  
Net decrease in cash, cash equivalents and restricted cash         (71,153) (89,010)  
Effect of exchange rate changes on cash         108 (704)  
Cash, cash equivalents and restricted cash at the beginning of the period   $ 205,935   $ 322,548 205,935 322,548 $ 322,548
Cash, cash equivalents and restricted cash at the end of the period 134,890   232,834   134,890 232,834 $ 205,935
Supplemental disclosures of cash flow information:              
Taxes         16 9  
Non-cash investing and financing activities:              
Non-cash additions to property, plant and equipment         5,482 2,038  
Operating lease right-of-use assets obtained in exchange for lease liabilities $ 366   $ 0   1,755 36,400  
Reclassification of pre-paid lease costs to operating lease right-of-use assets         123 28,046  
Non-cash additions to financing leases         $ 4,618 $ 0