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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Apr. 04, 2014
Mar. 29, 2013
Cash flows from operating activities:    
Net income (loss) $ (1,359) $ 471
Adjustments to reconcile net income (loss) to net cash used in operating activities:    
Depreciation of property and equipment 453 369
Amortization of intangibles 106 117
Deferred income taxes 24 7
Fair value adjustment of warrant 0 (27)
Gain on disposal of property and equipment 0 (28)
Change in net pension liability 45 58
Stock-based compensation expense 1,500 1,034
Accretion of asset retirement obligation 1 5
Provision for sales return and bad debt expense (55) 27
Changes in working capital:    
Accounts receivable (295) (322)
Inventories (1,137) 288
Prepaids, deposits and other current assets (1,270) (581)
Accounts payable (610) (1,328)
Other current liabilities 3 (522)
Net cash used in operating activities (2,594) (432)
Cash flows from investing activities:    
Acquisition of property and equipment (1,414) (1,218)
Net cash used in investing activities (1,414) (1,218)
Cash flows from financing activities:    
Repayment of capital lease obligations (46) (242)
Proceeds from exercise of stock options 2,188 23
Net cash provided by (used in) financing activities 2,142 (219)
Effect of exchange rate changes on cash and cash equivalents (18) (563)
Decrease in cash and cash equivalents (1,884) (2,432)
Cash and cash equivalents, at beginning of the period 22,954 21,675
Cash and cash equivalents, at end of the period $ 21,070 $ 19,243