CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Apr. 03, 2020	Mar. 29, 2019
Cash flows from operating activities:
Net income (loss)	$ (134)	$ 1,367
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation of property, plant, and equipment	766	1,222
Amortization of intangibles	9	8
Deferred income taxes	(1,369)	79
Change in net pension liability	173	119
Loss on disposal of property and equipment	3
Stock-based compensation expense	2,921	2,641
Provision for sales returns and bad debts	80	(34)
Inventory provision	336	455
Changes in working capital:
Accounts receivable	(3,462)	(554)
Inventories	(491)	(7)
Prepayments, deposits, and other current assets	(2,446)	(2,317)
Accounts payable	907	(185)
Other current liabilities	(5,464)	(2,063)
Net cash provided by (used in) operating activities	(8,171)	731
Cash flows from investing activities:
Acquisition of property and equipment	(2,185)	(2,203)
Acquisition of patents and licenses		(30)
Net cash used in investing activities	(2,185)	(2,233)
Cash flows from financing activities:
Repayment of finance lease obligations	(236)	(365)
Repayment on line of credit	(505)	(499)
Proceeds from the exercise of stock options	2,004	622
Proceeds from vested restricted stock	1	2
Net cash provided by (used in) financing activities	1,264	(240)
Effect of exchange rate changes on cash, cash equivalents and restricted cash	(25)	(24)
Decrease in cash, cash equivalents and restricted cash	(9,117)	(1,766)
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	$ 110,851	$ 102,233