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Consolidated Statements of Stockholders' Equity (USD $) In Thousands, unless otherwise specified | Total | Common Stock [Member] | Additional Paid-in Capital [Member] | Accumulated Other Comprehensive Income (Loss) [Member] | Accumulated Deficit [Member]
--- | --- | --- | --- | --- | ---
Balance at Jan. 03, 2010 | $ 21,259 | $ 35 | $ 177,862 | $ 1,130 | $ (157,768)
Balance (in shares) at Jan. 03, 2010 |  | 35,042 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Common stock issued under stock plans and employee stock purchase plans, shares |  | 1,471 |  |  |
Common stock issued under stock plans and employee stock purchase plans, value | 3,229 | 2 | 3,227 |  |
Private stock Offering, net issuance costs and warrants, value | 18 |  | 18 |  |
Issuance of common stock from exercise of warrants, shares |  | 1,293 |  |  |
Issuance of common stocks warrants, value | 2,780 | 1 | 2,779 |  |
Change in unrealized gain on available-for-sale securities | (514) |  |  | (514) |
Stock-based compensation | 2,418 |  | 2,418 |  |
Net income (loss) | 123 |  |  |  | 123
Balance at Jan. 02, 2011 | 29,313 | 38 | 186,304 | 616 | (157,645)
Balance (in shares) at Jan. 02, 2011 |  | 37,806 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Common stock issued under stock plans and employee stock purchase plans, shares |  | 830 |  |  |
Common stock issued under stock plans and employee stock purchase plans, value | 2,046 | 1 | 2,045 |  |
Change in unrealized gain on available-for-sale securities | (503) |  |  | (503) |
Stock-based compensation | 1,676 |  | 1,676 |  |
Net income (loss) | (7,594) |  |  |  | (7,594)
Balance at Jan. 01, 2012 | 24,938 | 39 | 190,025 | 113 | (165,239)
Balance (in shares) at Jan. 01, 2012 |  | 38,636 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Common stock issued under stock plans and employee stock purchase plans, shares |  | 748 |  |  |
Common stock issued under stock plans and employee stock purchase plans, value | 1,148 | 1 | 1,147 |  |
Private stock Offering, net of issuance costs and warrants, shares |  | 5,122 |  |  |
Private stock Offering, net issuance costs and warrants, value | 9,345 | 5 | 9,340 |  |
Issuance of common stock from exercise of warrants, shares |  | 0 |  |  |
Issuance of common stocks warrants, value | 2,236 | 0 | 2,236 |  |
Change in unrealized gain on available-for-sale securities | (124) |  |  | (124) |
Stock-based compensation | 2,049 |  | 2,049 |  |
Net income (loss) | (12,314) |  |  |  | (12,314)
Balance at Dec. 30, 2012 | $ 27,278 | $ 45 | $ 204,797 | $ (11) | $ (177,553)
Balance (in shares) at Dec. 30, 2012 |  | 44,506 |  |  |

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