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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2016
Oct. 02, 2015
Cash flows from operating activities:    
Net loss $ (11,962) $ (5,690)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:    
Depreciation of property, plant and equipment 1,933 1,563
Amortization of intangibles 171 154
Deferred income taxes (1,806) (148)
Change in net pension liability 390 136
Stock-based compensation expense 8,143 2,747
Provision for sales returns and bad debts 99 331
Changes in working capital:    
Accounts receivable 1,707 (2,040)
Inventories, net 1,601 1,497
Prepayments, deposits and other current assets (1,118) 737
Accounts payable 594 (991)
Other current liabilities 1,104 1,387
Net cash provided by (used in) operating activities 856 (317)
Cash flows from investing activities:    
Acquisition of property, plant and equipment (2,709) (1,283)
Cash proceeds from sale of property, plant and equipment 65 2
Net cash used in investing activities (2,644) (1,281)
Cash flows from financing activities:    
Repayment of capital lease obligations (302) (306)
Proceeds from sale-leaseback transactions 1,154 0
Repurchase of employee common stock for taxes withheld (611) 0
Proceeds from exercise of stock options 1,652 2,149
Proceeds from exercise of warrants 0 2,800
Net cash provided by financing activities 1,893 4,643
Effect of exchange rate changes on cash and cash equivalents 777 23
Increase in cash and cash equivalents 882 3,068
Cash and cash equivalents, at beginning of the period 13,402 13,013
Cash and cash equivalents, at end of the period $ 14,284 $ 16,081