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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 9 Months Ended
Sep. 27, 2019
Sep. 28, 2018
Cash flows from operating activities:    
Net income $ 7,669 $ 3,872
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation of property, plant, and equipment 2,853 1,792
Amortization of intangibles 26 26
Deferred income taxes 526 363
Change in net pension liability 264 233
Loss on disposal of property and equipment 14 8
Stock-based compensation expense 7,778 4,926
Provision for sales returns and bad debts 309 892
Inventory provision 1,222 1,181
Changes in working capital:    
Accounts receivable (4,260) (3,989)
Inventories (179) (3,625)
Prepayments, deposits, and other current assets (230) (1,021)
Accounts payable 546 2,121
Other current liabilities (536) 3,643
Net cash provided by operating activities 16,002 10,422
Cash flows from investing activities:    
Acquisition of property and equipment (7,169) (1,721)
Acquisition of patents and licenses (30)  
Net cash used in investing activities (7,199) (1,721)
Cash flows from financing activities:    
Proceeds from public offering of stock   72,150
Repayment of finance lease obligations (998) (1,396)
Repayment on line of credit (1,512) (251)
Proceeds from the exercise of stock options 1,829 4,580
Proceeds from vested restricted stock 2 2
Net cash provided by (used in) financing activities (679) 75,085
Effect of exchange rate changes on cash, cash equivalents and restricted cash 204 (111)
Increase in cash, cash equivalents and restricted cash 8,328 83,675
Cash, cash equivalents and restricted cash, at beginning of the period 103,999 18,641
Cash, cash equivalents and restricted cash, at end of the period $ 112,327 $ 102,316