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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Sep. 27, 2013
Sep. 28, 2012
Cash flows from operating activities:    
Net income (loss) $ 1,274 $ (349)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:    
Depreciation of property and equipment 1,325 989
Amortization of intangibles 334 525
Deferred income taxes (220) 114
Fair value adjustment of warrant (27) (217)
Loss on disposal of property and equipment 172 47
Change in net pension liability 124 187
Stock-based compensation expense 2,924 2,317
Accretion of asset retirement obligation 9 0
Other 157 40
Changes in working capital:    
Accounts receivable (1,423) 910
Inventories (707) (734)
Prepaids, deposits and other current assets (614) 85
Accounts payable (389) (444)
Other current liabilities 489 236
Net cash provided by operating activities 3,428 3,706
Cash flows from investing activities:    
Release of restricted cash 0 129
Acquisition of property and equipment (2,984) (1,161)
Net cash used in investing activities (2,984) (1,032)
Cash flows from financing activities:    
Repayment of capital lease obligations (675) (619)
Proceeds from exercise of stock options 2,723 1,102
Net cash provided by financing activities 2,048 483
Effect of exchange rate changes on cash and cash equivalents (816) 14
Increase in cash and cash equivalents 1,676 3,171
Cash and cash equivalents, at beginning of the period 21,675 16,582
Cash and cash equivalents, at end of the period $ 23,351 $ 19,753