CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Oct. 02, 2020	Sep. 27, 2019
Cash flows from operating activities:
Net income	$ 2,586	$ 7,669
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation of property, plant, and equipment	2,276	2,853
Amortization of intangibles	26	26
Deferred income taxes	(1,215)	526
Change in net pension liability	522	264
Loss on disposal of property and equipment	3	14
Stock-based compensation expense	8,965	7,778
Provision for sales returns and bad debts	815	309
Inventory provision	1,195	1,222
Changes in working capital:
Accounts receivable	(10,975)	(4,260)
Inventories	(1,353)	(179)
Prepayments, deposits, and other current assets	(636)	(230)
Accounts payable	(657)	546
Other current liabilities	(151)	(536)
Net cash provided by operating activities	1,401	16,002
Cash flows from investing activities:
Acquisition of property and equipment	(6,259)	(7,169)
Acquisition of patents and licenses		(30)
Net cash used in investing activities	(6,259)	(7,199)
Cash flows from financing activities:
Repayment of finance lease obligations	(455)	(998)
Repayment on line of credit	(511)	(1,512)
Proceeds from the exercise of stock options	13,986	1,829
Proceeds from vested restricted stock	1	2
Net cash provided by (used in) financing activities	13,021	(679)
Effect of exchange rate changes on cash, cash equivalents and restricted cash	207	204
Increase in cash, cash equivalents and restricted cash	8,370	8,328
Cash, cash equivalents and restricted cash, at beginning of the period	119,968	103,999
Cash, cash equivalents and restricted cash, at end of the period	$ 128,338	$ 112,327