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Condensed Consolidated Statements of Operations - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Oct. 01, 2022
Sep. 30, 2023
Oct. 01, 2022
Income Statement [Abstract]        
Net revenues $ 75,312,000 $ 82,500,000 $ 269,697,000 $ 338,995,000
Cost of goods sold 82,566,000 97,340,000 268,493,000 359,807,000
Gross (loss) profit (7,254,000) (14,840,000) 1,204,000 (20,812,000)
Research and development expenses 9,118,000 13,413,000 30,323,000 49,293,000
Selling, general and administrative expenses 53,252,000 54,495,000 152,607,000 192,624,000
Restructuring expenses (4,000) 6,993,000 (631,000) 14,321,000
Total operating expenses 62,366,000 74,901,000 182,299,000 256,238,000
Loss from operations (69,620,000) (89,741,000) (181,095,000) (277,050,000)
Other (expense) income, net:        
Interest expense (989,000) (1,040,000) (2,967,000) (3,173,000)
Other, net 243,000 (2,151,000) 4,897,000 (8,177,000)
Total other (expense) income, net (746,000) (3,191,000) 1,930,000 (11,350,000)
Loss before taxes (70,366,000) (92,932,000) (179,165,000) (288,400,000)
Income tax expense 0 0 5,000 21,000
Equity in losses of unconsolidated joint venture 126,000 8,746,000 3,864,000 10,849,000
Net loss $ (70,492,000) $ (101,678,000) $ (183,034,000) $ (299,270,000)
Net loss per share available to common stockholders—basic (in dollars per share) $ (1.09) $ (1.60) $ (2.85) $ (4.71)
Net loss per share available to common stockholders—diluted (in dollars per share) $ (1.09) $ (1.60) $ (2.85) $ (4.71)
Weighted average common shares outstanding—basic (in shares) 64,398,448 63,694,592 64,210,809 63,579,763
Weighted average common shares outstanding—diluted (in shares) 64,398,448 63,694,592 64,210,809 63,579,763