CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Jan. 01, 2021	Jan. 03, 2020
Cash flows from operating activities:
Net income	$ 24,501	$ 5,913	$ 14,048
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation of property, plant, and equipment	3,608	3,060	3,665
Amortization of intangibles	34	35	34
Deferred income taxes	1,495	(849)	(3,481)
Change in net pension liability	137	656	359
Loss on disposal of property and equipment	2	213	14
Stock-based compensation expense	14,605	12,146	10,547
Provision for sales returns and bad debts	318	835	275
Inventory provision	1,654	1,706	1,580
Changes in working capital:
Accounts receivable	(8,868)	(3,974)	(4,502)
Inventories	66	(1,390)	(950)
Prepayments, deposits, and other current assets	(711)	(3,753)	(1,313)
Accounts payable	108	(1,199)	1,084
Other current liabilities	7,013	7,552	4,435
Net cash provided by operating activities	43,962	20,951	25,795
Cash flows from investing activities:
Acquisition of property and equipment	(13,645)	(8,404)	(10,095)
Acquisition of patents and licenses			(83)
Net cash used in investing activities	(13,645)	(8,404)	(10,178)
Cash flows from financing activities:
Repayment of finance lease obligations	(348)	(561)	(1,294)
Repayment of line of credit	1,297	515	2,018
Proceeds from the exercise of stock options	19,437	20,646	3,459
Proceeds from vested restricted stock	1	1	2
Net cash provided by financing activities	17,793	19,571	149
Effect of exchange rate changes on cash and cash equivalents	(857)	367	203
Increase in cash and cash equivalents	47,253	32,485	15,969
Cash and cash equivalents, at beginning of year	152,453	119,968	103,999
Cash and cash equivalents, at end of year	$ 199,706	$ 152,453	$ 119,968