CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 30, 2022	Dec. 31, 2021	Jan. 01, 2021
Cash flows from operating activities:
Net income	$ 38,755	$ 24,501	$ 5,913
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation of property, plant, and equipment	4,481	3,608	3,060
Amortization of intangibles	28	34	35
Accretion/amortization of investments available for sale	(1,198)
Deferred income taxes	(1,344)	1,495	(849)
Change in net pension liability	53	137	656
Loss on disposal of property and equipment	65	2	213
Stock-based compensation expense	20,371	14,605	12,146
Accretion of asset retirement obligation	47
Provision for sales returns and bad debts	913	318	835
Inventory provision	2,423	1,654	1,706
Changes in working capital:
Accounts receivable	(19,601)	(8,868)	(3,974)
Inventories	(7,943)	66	(1,390)
Prepayments, deposits, and other current assets	(2,549)	(711)	(3,753)
Accounts payable	1,805	108	(1,199)
Other current liabilities	(591)	7,013	7,552
Net cash provided by operating activities	35,715	43,962	20,951
Cash flows from investing activities:
Acquisition of property and equipment	(18,108)	(13,645)	(8,404)
Purchase of investments available for sale	(155,748)
Proceeds from sale or maturity of investments available for sale	17,480
Net cash used in investing activities	(156,376)	(13,645)	(8,404)
Cash flows from financing activities:
Repayment of finance lease obligations	(126)	(348)	(561)
Repayment of line of credit		1,297	515
Proceeds from the exercise of stock options	8,422	19,437	20,646
Proceeds from vested restricted stock	1	1	1
Net cash provided by financing activities	8,297	17,793	19,571
Effect of exchange rate changes on cash and cash equivalents	(862)	(857)	367
Increase (decrease) in cash and cash equivalents	(113,226)	47,253	32,485
Cash and cash equivalents, at beginning of year	199,706	152,453	119,968
Cash and cash equivalents, at end of year	$ 86,480	$ 199,706	$ 152,453