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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jul. 04, 2014
Jun. 28, 2013
Cash flows from operating activities:    
Net income (loss) $ (3,148) $ 749
Adjustments to reconcile net income (loss) to net cash (used in) provided by operating activities:    
Depreciation of property and equipment 981 840
Amortization of intangibles 213 225
Deferred income taxes 57 129
Fair value adjustment of warrant 0 (27)
Loss on disposal of property and equipment 0 59
Change in net pension liability 83 57
Stock-based compensation expense 3,183 2,019
Accretion of asset retirement obligation 2 7
Provision for sales returns and bad debts 1 111
Changes in working capital:    
Accounts receivable (1,895) (2,229)
Inventories (2,093) 71
Prepaids, deposits and other current assets (20) (507)
Accounts payable (874) (1,123)
Other current liabilities (554) (25)
Net cash (used in) provided by operating activities (4,064) 356
Cash flows from investing activities:    
Cash proceeds from sale of equipment 68 0
Acquisition of property and equipment (2,269) (2,017)
Net cash used in investing activities (2,201) (2,017)
Cash flows from financing activities:    
Repayment of capital lease obligations (251) (478)
Proceeds from exercise of stock options 2,632 952
Net cash provided by financing activities 2,381 474
Effect of exchange rate changes on cash and cash equivalents 116 (763)
Decrease in cash and cash equivalents (3,768) (1,950)
Cash and cash equivalents, at beginning of the period 22,954 21,675
Cash and cash equivalents, at end of the period $ 19,186 $ 19,725