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Condensed Consolidated Statements Of Cash Flows (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jun. 29, 2013
Jun. 30, 2012
Cash flows from operating activities:    
Net loss $ (6,033) $ (5,061)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 813 1,070
Gain on disposal of property and equipment 1  
Stock-based compensation 803 1,005
Changes in operating assets and liabilities:    
Accounts receivable 1,370 3,305
Inventories 2,075 (3,586)
Prepaid expenses and other current assets 491 354
Other assets 4 31
Accounts payable 71 662
Accrued payroll and related liabilities (74) (508)
Accured expenses and other current liabilities (51) 19
Accrued engineering charges   40
Net cash used in operating activities (530) (2,669)
Cash flows from investing activities:    
Acquisition of property and equipment (52) (1,089)
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 365 (1,089)
Cash flows from financing activities:    
Proceeds of bank term loan, net of issuance costs   1,320
Payments on debt (830) (1,045)
Proceeds from public offering, net 28 3,618
Proceeds from exercise of equity awards, net of taxes remitted for restricted stock 29 629
Net cash (used in) provided by financing activities (773) 4,522
(Decrease) increase in cash and cash equivalents (938) 764
Cash and cash equivalents at beginning of period 7,755 10,535
Cash and cash equivalents at end of period $ 6,817 $ 11,299