CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 25, 2022	Sep. 30, 2023	Sep. 25, 2022
Revenues [Abstract]
Revenue, net	$ 8,144	$ 14,708	$ 22,932	$ 37,615
Costs and expenses:
Cost of goods sold	7,052	13,743	23,516	36,987
Selling, administrative and engineering expense	26,435	21,988	81,650	56,706
Total costs and expenses	33,487	35,731	105,166	93,693
Operating loss	(25,343)	(21,023)	(82,234)	(56,078)
Other income, net	0	79	0	235
Interest income (expense)	2,726	(3)	8,172	(23)
Change in fair value of warrant liabilities	8,038	0	(2,332)	0
Loss before income taxes	(14,579)	(20,947)	(76,394)	(56,341)
Income tax (benefit) provision	(1)	(4)	63	159
Net loss	(14,578)	(20,943)	(76,457)	(56,500)
Other comprehensive loss:
Foreign currency translation adjustments	(7)	(60)	(7)	(154)
Comprehensive loss	$ (14,585)	$ (21,003)	$ (76,464)	$ (56,654)
Net loss per share, basic (Note 5) (in dollars per share)	$ (0.07)	$ (0.13)	$ (0.38)	$ (0.35)
Net loss per share, diluted (Note 5) (in dollars per share)	$ (0.07)	$ (0.13)	$ (0.38)	$ (0.35)
Related Party
Costs and expenses:
Interest expense related party	$ 0	$ 0	$ 0	$ (475)