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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. 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 stocks warrants, value | 2,236 |  | 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 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Common stock issued under stock plans and employee stock purchase plans, shares |  | 542 |  |  |
Common stock issued under stock plans and employee stock purchase plans, value | 966 | 1 | 965 |  |
Private stock Offering, net of issuance costs and warrants, shares |  | 8,740 |  |  |
Private stock Offering, net issuance costs and warrants, value | 23,126 | 8 | 23,118 |  |
Issuance of common stocks warrants, value | 0 |  |  |  |
Change in unrealized gain on available-for-sale securities | 11 |  |  | 11 |
Stock-based compensation | 1,493 |  | 1,493 |  |
Net income (loss) | (12,276) |  |  |  | (12,276)
Balance at Dec. 29, 2013 | $ 40,598 | $ 54 | $ 230,373 | $ 0 | $ (189,829)
Balance (in shares) at Dec. 29, 2013 |  | 53,788 |  |  |

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