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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 9 Months Ended
Oct. 02, 2015
Oct. 03, 2014
Cash flows from operating activities:    
Net loss $ (5,690) $ (5,854)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation of property, plant and equipment 1,563 1,520
Amortization of intangibles 154 317
Deferred income taxes (148) 161
Change in net pension liability 136 118
Stock-based compensation expense 2,747 4,736
Accretion of asset retirement obligation 0 3
Provision for sales returns and bad debts 331 75
Changes in working capital:    
Accounts receivable, net (2,040) (1,139)
Inventories, net 1,497 (3,191)
Prepayments, deposits and other current assets 737 207
Accounts payable (991) (17)
Other current liabilities 1,387 (1,364)
Net cash used in operating activities (317) (4,428)
Cash flows from investing activities:    
Acquisition of property, plant and equipment (1,283) (2,517)
Cash proceeds from sale of property, plant and equipment 2 68
Net cash used in investing activities (1,281) (2,449)
Cash flows from financing activities:    
Repayment of capital lease obligations (306) (372)
Proceeds from exercise of stock options 2,149 2,793
Proceeds from exercise of warrants 2,800 0
Net cash provided by financing activities 4,643 2,421
Effect of exchange rate changes on cash and cash equivalents 23 (139)
Increase (decrease) in cash and cash equivalents 3,068 (4,595)
Cash and cash equivalents, at beginning of the period 13,013 22,954
Cash and cash equivalents, at end of the period $ 16,081 $ 18,359