CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)	9 Months Ended
	Sep. 28, 2024	Sep. 30, 2023
Operating activities
Net loss	$ (7,042,000)	$ (10,345,000)
Adjustments to reconcile net loss to net cash and cash equivalents provided by (used in) operating activities:
Depreciation and amortization	1,485,000	1,038,000
Net amortization (accretion) of investment premiums and discounts	(528,000)	(145,000)
Amortization of intangible assets	102,000	102,000
Equity-based compensation	2,940,000	3,393,000
Straight-line rent adjustment and amortization of lease incentives	253,000	(863,000)
(Gain) loss on disposal of fixed assets	519,000	(41,000)
Deferred income taxes	1,569,000	629,000
Changes in operating assets and liabilities	1,059,000	(34,693,000)
Total adjustments	7,399,000	(30,580,000)
Net cash and cash equivalents provided by (used in) operating activities	357,000	(40,925,000)
Investing activities
Purchases of investments	(51,643,000)	(10,453,000)
Proceeds from sales and maturities of investments	37,109,000	31,887,000
Proceeds from sales of fixed assets	7,000	65,000
Purchases of leasehold improvements and equipment	(1,932,000)	(4,940,000)
Net cash and cash equivalents provided by (used in) investing activities	(16,459,000)	16,559,000
Financing activities
Net proceeds from issuance of common stock	964,000	1,365,000
Payment of acquisition-related contingent consideration	0	(250,000)
Taxes paid related to net share settlement	(475,000)	(1,683,000)
Net cash and cash equivalents provided by (used in) financing activities	489,000	(568,000)
Effect of exchange rate changes on cash	229,000	(234,000)
Net decrease in cash, cash equivalents and restricted cash	(15,384,000)	(25,168,000)
Cash, cash equivalents and restricted cash at beginning of period	52,141,000	69,690,000
Cash, cash equivalents and restricted cash at end of period	36,757,000	44,522,000
Non-cash investing and financing activity
Additions to right-of-use-assets obtained from new operating lease liabilities	$ 0	$ 81,000