CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)	6 Months Ended
	Jul. 01, 2023	Jul. 02, 2022
Operating activities
Net loss	$ (8,769,000)	$ (10,673,000)
Adjustments to reconcile net loss to net cash and cash equivalents used in operating activities:
Depreciation and amortization	681,000	776,000
Amortization of intangible assets	68,000	0
Net amortization (accretion) of investment premiums and discounts	(108,000)	(20,000)
Equity-based compensation	3,076,000	489,000
Straight-line rent adjustment and amortization of lease incentives	(554,000)	(483,000)
Deferred income taxes	183,000	345,000
(Gain) loss on disposal of equipment	(41,000)	1,453,000
Changes in operating assets and liabilities	(27,931,000)	(3,322,000)
Total adjustments	(24,626,000)	(762,000)
Net cash and cash equivalents used in operating activities	(33,395,000)	(11,435,000)
Investing activities
Purchases of investments	(9,099,000)	(45,663,000)
Proceeds from sales and maturities of investments	23,029,000	7,263,000
Proceeds from sales of fixed assets	65,000	0
Purchases of leasehold improvements and equipment	(4,335,000)	(888,000)
Net cash and cash equivalents provided by (used in) investing activities	9,660,000	(39,288,000)
Financing activities
Net proceeds from issuance of common stock	838,000	2,211,000
Payment of acquisition-related contingent consideration	(250,000)	0
Taxes paid related to net share settlement	(1,563,000)	(295,000)
Net cash and cash equivalents provided by (used in) financing activities	(975,000)	1,916,000
Effect of exchange rate changes on cash and cash equivalents	(219,000)	(252,000)
Net decrease in cash, cash equivalents and restricted cash	(24,929,000)	(49,059,000)
Cash, cash equivalents and restricted cash at beginning of period	69,690,000	103,514,000
Cash, cash equivalents and restricted cash at end of period	44,761,000	54,455,000
Non-cash investing and financing activity
Additions to right-of-use-assets obtained from new operating lease liabilities	$ 0	$ 94,000