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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2023
Apr. 01, 2023
Oct. 01, 2022
Apr. 02, 2022
Sep. 30, 2023
Oct. 01, 2022
Dec. 31, 2022
Cash flows from operating activities:              
Net loss $ (70,492) $ (59,037) $ (101,678) $ (100,458) $ (183,034) $ (299,270)  
Adjustments to reconcile net loss to net cash used in operating activities:              
Depreciation and amortization 5,800   8,400   17,707 23,255  
Non-cash lease expense         5,997 3,389  
Share-based compensation expense         23,791 28,848  
Loss on sale of fixed assets         3,876 946  
Amortization of debt issuance costs         2,951 2,951  
Equity in losses of unconsolidated joint venture 126   8,746   3,864 10,849  
Write-off of note receivable         3,795 0  
Unrealized losses on foreign currency transactions         2,740 11,160  
Net change in operating assets and liabilities:              
Accounts receivable         (1,806) 7,703  
Inventories         40,470 (12,411)  
Prepaid expenses and other assets         1,282 7,802  
Accounts payable         8,335 (2,922)  
Accrued expenses and other current liabilities         (2,752) (3,429)  
Prepaid lease costs, non-current         (3,254) (49,063)  
Operating lease liabilities         (3,244) (3,177)  
Long-term liabilities         0 3,022  
Net cash used in operating activities         (79,282) (270,347)  
Cash flows from investing activities:              
Purchases of property, plant and equipment         (8,567) (59,952)  
Proceeds from sale of fixed assets         2,477 0  
Payments for investment in joint venture         (3,250) (10,000)  
Payments of security deposits         0 (752)  
Net cash used in investing activities         (9,340) (70,704)  
Cash flows from financing activities:              
Principal payments under finance lease obligations         (168) (152)  
Proceeds from exercise of stock options         171 1,610  
Payments of minimum withholding taxes on net share settlement of equity awards         (391) (1,073)  
Net cash (used in) provided by financing activities         (388) 385  
Net decrease in cash, cash equivalents and restricted cash         (89,010) (340,666)  
Effect of exchange rate changes on cash         (704) (2,452)  
Cash, cash equivalents and restricted cash at the beginning of the period   $ 322,548   $ 733,294 322,548 733,294 $ 733,294
Cash, cash equivalents and restricted cash at the end of the period $ 232,834   $ 390,176   232,834 390,176 $ 322,548
Supplemental disclosures of cash flow information:              
Interest         0 3  
Taxes         9 21  
Non-cash investing and financing activities:              
Non-cash additions to property, plant and equipment         2,038 9,639  
Non-cash additions to financing leases         0 280  
Reclassification of pre-paid lease costs to operating lease right-of-use assets         28,046 27,718  
Operating lease right-of-use assets obtained in exchange for lease liabilities         $ 36,400 $ 37,134