CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Apr. 02, 2021	Apr. 03, 2020
Cash flows from operating activities:
Net income (loss)	$ 4,992	$ (134)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Depreciation of property, plant, and equipment	865	766
Amortization of intangibles	9	9
Deferred income taxes		(1,369)
Change in net pension liability	127	173
Loss on disposal of property and equipment	2	3
Stock-based compensation expense	3,330	2,921
Provision for sales returns and bad debts	103	80
Inventory provision	384	336
Changes in working capital:
Accounts receivable	1,138	(3,462)
Inventories	984	(491)
Prepayments, deposits, and other current assets	(143)	(2,446)
Accounts payable	(399)	907
Other current liabilities	(4,626)	(5,464)
Net cash provided by (used in) operating activities	6,766	(8,171)
Cash flows from investing activities:
Acquisition of property and equipment	(2,159)	(2,185)
Net cash used in investing activities	(2,159)	(2,185)
Cash flows from financing activities:
Repayment of finance lease obligations	(235)	(236)
Repayment on line of credit		(505)
Proceeds from the exercise of stock options	6,234	2,004
Proceeds from vested restricted stock	1	1
Net cash provided by financing activities	6,000	1,264
Effect of exchange rate changes on cash, cash equivalents and restricted cash	(716)	(25)
Increase (decrease) in cash, cash equivalents and restricted cash	9,891	(9,117)
Cash, cash equivalents and restricted cash, at beginning of the period	152,453	119,968
Cash, cash equivalents and restricted cash, at end of the period	$ 162,344	$ 110,851