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Condensed Consolidated Statements of Cash Flows (unaudited) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jul. 01, 2012
Jul. 03, 2011
Cash flows from operating activities:    
Net income (loss) $ (6,957) $ (2,938)
Adjustments to reconcile net income (loss) to net cash provided by (used for) operating activities:    
Depreciation and amortization 587 651
Stock-based compensation 818 879
Write-down of inventories 428 176
(Gains) losses on disposal of equipment 0 (12)
Tax effect on other comprehensive income (63) 0
Bad Debt 10 0
Changes in operating assets and liabilities:    
Accounts receivable (86) 1,019
Inventories 609 (883)
Other assets 9 64
Trade payables (852) (25)
Accrued liabilities 462 (217)
Deferred royalty revenue (8) (132)
Other long-term liabilities (9) (37)
Net cash provided by (used for) operating activities (5,052) (1,455)
Cash flows from investing activities:    
Capital expenditures for property and equipment (265) (501)
Net cash provided by (used for) investing activities (265) (501)
Cash flows from financing activities:    
Payment of debt and capital lease obligations (151) (201)
Net proceeds from issuance of common stock 12,132 1,640
Net cash provided by (used for) financing activities 11,981 1,439
Net increase (decrease) in cash and cash equivalents 6,664 (517)
Cash and cash equivalents at beginning of period 20,203 21,956
Cash and cash equivalents at end of period 26,867 21,439
Supplemental schedule of non-cash investing and financing activities :    
Capital lease obligation to finance capital expenditures and related maintenance 756 207
Purchase of equipment included in accounts payable $ 52 $ 154