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Condensed Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Apr. 01, 2012
Cash flows from operating activities:    
Net income (loss) $ (3,584) $ (3,721)
Adjustments to reconcile net income (loss) to net cash provided by (used for) operating activities:    
Depreciation and amortization 317 290
Stock-based compensation 452 384
Write-down of inventories 343 329
Tax effect on other comprehensive income 0 (63)
Bad Debt 31 10
Changes in operating assets and liabilities:    
Accounts receivable (181) (85)
Inventories 160 318
Other assets 102 (195)
Trade payables (572) (420)
Accrued liabilities 77 336
Deferred royalty revenue 0 (8)
Other long-term liabilities 26 (9)
Net cash provided by (used for) operating activities (2,829) (2,834)
Cash flows from investing activities:    
Capital expenditures for property and equipment (62) (69)
Net cash provided by (used for) investing activities (62) (69)
Cash flows from financing activities:    
Payment of debt and capital lease obligations (35) (116)
Net proceeds from issuance of common stock 7 39
Net increase (decrease) in cash and cash equivalents (28) (77)
Net increase (decrease) in cash and cash equivalents (2,919) (2,980)
Cash and cash equivalents at beginning of period 22,578 20,203
Cash and cash equivalents at end of period 19,659 17,223
Supplemental schedule of non-cash investing and financing activities :    
Capital lease obligation to finance capital expenditures 374 917
Purchase of equipment included in accounts payable $ 0 $ 765