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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 28, 2025
Mar. 29, 2025
Jun. 29, 2024
Mar. 30, 2024
Jun. 28, 2025
Jun. 29, 2024
Dec. 28, 2024
Cash flows from operating activities:              
Net loss $ (5,166,633) $ (3,113,533) $ (5,921,998) $ (32,548,215) $ (8,280,166) $ (38,470,213) $ (43,900,000)
Adjustments to reconcile net loss to net cash used in operating activities:              
Depreciation and amortization         444,861 332,155  
Stock-based compensation         1,522,109 1,411,346  
Loss on sale of property and equipment         58,818  
Investment impairment net of unrealized gains         24,000 734,243  
Gain on sale of equity investment         (300,000)  
Income taxes         104,455  
Foreign currency (gains) losses         (113,183) 38,633  
Noncash provision for excess inventory         754,138 1,023,709  
Accrued litigation damages         24,800,000  
Changes in assets and liabilities:              
Accounts receivable         2,333,500 2,994,914  
Contract assets         241,431 (3,353,456)  
Inventory         (1,200,455) 912,158  
Prepaid expenses, other current assets and other assets         (619,672) (857,448)  
Accounts payable and accrued expenses         (2,173,477) 4,474,548  
Accrued warranty         (541,259) 513,556  
Contract liabilities and billings in excess of revenue earned         172,130 (738,047)  
Net cash used in operating activities         (7,572,770) (6,183,902) (14,200,000)
Cash flows from investing activities:              
Capital expenditures         (1,233,751) (310,600)  
Purchases of marketable securities         (15,156,585) (1,119,012)  
Proceeds from sale of marketable securities         33,960,226 5,250,066  
Proceeds from sale of equity investment         300,000  
Other assets         (2,483)  
Net cash from investing activities         17,867,407 3,820,454  
Cash flows from financing activities:              
Issuance of common stock, net of costs         7,242,581  
Settlements of restricted stock for tax withholding obligations         (89,657)  
Net cash (used in) provided by financing activities         (89,657) 7,242,581  
Effect of exchange rate changes on cash         4,210 3,029  
Net increase in cash, cash equivalents and restricted cash         10,209,190 4,882,162  
Cash, cash equivalents and restricted cash:              
Beginning of period   $ 15,210,120   $ 6,210,685 15,210,120 6,210,685 6,210,685
End of period $ 25,419,310   $ 11,092,847   $ 25,419,310 $ 11,092,847 $ 15,210,120