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Condensed Consolidated Statements Of Cash Flows (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 30, 2013
Mar. 31, 2012
Cash flows from operating activities:    
Net loss $ (3,170) $ (1,081)
Adjustments to reconcile net loss to net cash (used in) provided by operating activities:    
Depreciation and amortization 418 535
Gain on disposal of property and equipment 2  
Stock-based compensation 434 523
Changes in operating assets and liabilities:    
Accounts receivable 245 1,066
Inventories 1,155 (1,647)
Prepaid expenses and other current assets 400 (20)
Other assets 1 33
Accounts payable 338 1,070
Accrued payroll and related liabilities 126 (188)
Accured expenses and other current liabilities (7) (83)
Net cash (used in) provided by operating activities (58) 208
Cash flows from investing activities:    
Acquisition of property and equipment (29) (317)
Proceeds from sale of equipment 2  
Proceeds from maturities and sales of investments in marketable securities 415  
Net cash provided by (used in) investing activities 388 (317)
Cash flows from financing activities:    
Payments on debt (417) (607)
Proceeds from public offering, net   3,573
Proceeds from exercise of equity awards, net of taxes remitted for restricted stock 17 482
Net cash (used in) provided by financing activities (400) 3,448
(Decrease) increase in cash and cash equivalents (70) 3,339
Cash and cash equivalents at beginning of period 7,755 10,535
Cash and cash equivalents at end of period $ 7,685 $ 13,874