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Stockholders' Equity
 12 Months Ended
Dec. 31, 2011
Stockholders' Equity [Abstract]  
Stockholders' Equity

Note 10—Stockholders' Equity

Serial Preferred Stock

        The Company's authorized capital includes 10,000,000 shares of Serial Preferred Stock, with a par value of $0.001 per share. No shares were outstanding at December 31, 2011 or January 1, 2011.

Common Stock

        On March 24, 2010, the Company sold 4,594,250 shares of common stock in a registered public offering. The shares were sold to the public at a price of $3.85 per share. The Company received net proceeds of $16.2 million, after underwriting discounts and commissions, and estimated expenses payable by the Company.

        In November 2011, the Company entered into a sales agreement with Ascendiant Capital Markets LLC ("Ascendiant"), whereby shares with a total value of up to $10.0 million may be released for sale to the public at the discretion of management at a price equal to the current market price in an "at-the-market" offering as defined in Rule 415 under the Securities Act of 1933. In December 2011, the Company received net proceeds of approximately $1.9 million raised through the sale of 697,470 shares. The sales agreement with Ascendiant expires in November 2014.

Stock-Based Compensation

        During 2011 and 2010, the Company cancelled 37,422 and 16,329 shares of common stock, respectively, valued at approximately $78,000 and $49,000, respectively, in connection with its obligation to holders of restricted stock to withhold the number of shares required to satisfy the holders' tax liabilities in connection with the vesting of such shares.

        The Company is incorporated in the state of Delaware, and as such, is subject to various state laws which may restrict the payment of dividends or purchase of treasury shares.

        The Company has stock-based compensation awards outstanding pursuant to the Amended and Restated 2000 Equity Incentive Plan (the "2000 Plan") and the Amended and Restated 2006 Equity Incentive Plan (the "2006 Plan"), under which a variety of option and direct stock-based awards may be granted to employees and nonemployees of the Company. Further grants under the 2000 Plan were suspended upon the adoption of the 2006 Plan. In addition to awards made pursuant to the 2006 Plan, the Company periodically issues inducement grants outside the 2006 Plan to certain new hires.

        Subject to certain adjustments, as of December 31, 2011, the Company was authorized to issue a maximum of 4,205,566 shares of common stock pursuant to awards under the 2006 Plan. That maximum number will automatically increase on the first day of each subsequent calendar year by the lesser of (i) 5.0% of the number of shares of common stock that are issued and outstanding as of the first day of the calendar year, and (ii) 1,200,000 shares of common stock, subject to adjustment for certain corporate actions. At December 31, 2011, the Company had 149,590 shares available for grant under the 2006 Plan. At December 31, 2011, an additional 170,000 shares were reserved for issuance upon exercise of inducement grants. Options granted under the 2000 Plan, the 2006 Plan and outside the equity incentive plans primarily vest at a rate of at least 25% per year over four years and expire 10 years from the date of grant. Restricted stock awards vest in eight equal increments at intervals of approximately six months from the date of grant.

        A summary of the Company's common stock option activity is presented below (shares in thousands):

 
   Options Outstanding  
 
   Number of
Shares
(in thousands) 		  Weighted-
Average
Exercise
Price 		  Weighted-
Average
Remaining
Contractual
Life
(in years) 		  Aggregate
Intrinsic
Value
(in thousands) 		 

Options outstanding—January 2, 2010

     4,298   $ 2.41              

Options granted

     868     3.12              

Options exercised

     (84 )   0.96              

Options cancelled

     (448 )   2.48              
                         

Options outstanding—January 1, 2011

     4,634     2.57              

Options granted

    
1,455		    
2.21		              

Options exercised

     (435 )   0.47              

Options cancelled

     (286 )   2.89              
                         

Options outstanding—December 31, 2011

     5,368   $ 2.62     6.1     4,031  
                   

Options exercisable—December 31, 2011

     3,570   $ 2.89     4.7     3,052  
                   

Options exercisable and expected to vest—December 31, 2011

     5,117   $ 2.65     5.9     3,924  
                   

        The following table summarizes information about stock options outstanding and exercisable at December 31, 2011:

 
   Options Outstanding   Options Exercisable  
Exercise Price Range
  Number of
shares
(in thousands) 		  Weighted
Average
Remaining
Contractual
Life
(in years) 		  Weighted
Average
Exercise
Price 		  Number of
shares
(in thousands) 		  Weighted
Average
Remaining
Contractual
Life
(in years) 		  Weighted
Average
Exercise
Price 		 

$0.20 - $1.00

     1,395     3.9   $ 0.29     1,127     3.1   $ 0.29  

$1.01 - $3.00

     2,753     7.6   $ 2.19     1,336     5.9   $ 2.19  

$3.01 - $5.00

     275     7.2   $ 3.85     181     6.6   $ 3.87  

$5.01 - $8.45

     945     4.7   $ 6.96     926     4.7   $ 6.97  
                                   

 

     5,368     6.1   $ 2.62     3,570     4.7   $ 2.89  
                                   

        A summary of the Company's restricted stock awards is presented below (shares in thousands):

 
   Restricted Stock
Outstanding 		 
 
   Number of
Shares 		  Weighted-
Average
Grant-Date
Fair Value
per Share 		 

Balance outstanding at January 2, 2010

     —   $ —  

Restricted stock granted

     528     3.46  

Restricted stock vested

     (67 )   3.45  

Restricted stock forfeited

     (35 )   3.45  
           

Balance outstanding at January 1, 2011

     426     3.46  

Restricted stock granted

     24     1.51  

Restricted stock vested

     (118 )   3.47  

Restricted stock forfeited

     (13 )   3.31  
           

Balance outstanding at December 31, 2011

     319   $ 3.32  
           

        The following table presents details of the assumptions used to calculate the weighted-average grant date fair value of common stock options granted by the Company:

 
   December 31,
2011 		  January 1,
2011 		 

Expected term (in years)

     6.0     5.6  

Expected volatility

     135 %   143 %

Risk-free interest rate

     2.12 %   1.95 %

Expected dividends

     —     —  
           

Weighted-average grant date fair value per share

   $ 2.01   $ 2.84  
           

Grant date fair value of options vested

   $ 1,269   $ 1,931  
           

Intrinsic value of options exercised (in thousands)

   $ 960   $ 259  
           

        The weighted-average fair value per share of the restricted stock granted in 2011 and 2010 was calculated based on the fair market value of the Company's common stock on the respective grant dates. The grant date fair value of restricted stock vested was $0.2 million in both 2011 and 2010.

        At December 31, 2011, the amount of unearned stock-based compensation currently estimated to be expensed from 2012 through 2015 related to unvested common stock options and restricted stock awards is approximately $3.6 million, net of estimated forfeitures. The weighted-average period over which the unearned stock-based compensation is expected to be recognized is approximately 2.8 years. If there are any modifications or cancellations of the underlying unvested awards, the Company may be required to accelerate, increase or cancel any remaining unearned stock-based compensation expense or calculate and record additional expense. Future stock-based compensation expense and unearned stock-based compensation will increase to the extent that the Company grants additional common stock options or other stock-based awards.

Warrants

        The Company has issued warrants to purchase shares of its common stock to certain non-employees for services rendered or to be rendered in the future. Such warrants are issued outside of the 2000 Plan and 2006 Plan. A summary of the warrant activity is presented below:

 
   Number of
Shares
(in thousands) 		  Weighted-
Average
Exercise
Price 		 

Warrants outstanding—January 2, 2010

     18   $ 1.25  

Warrants exercised

     (18 )   1.25  
           

Warrants outstanding—January 1, 2011

     —   $ —  
           

        There were no warrants issued, exercised or cancelled in the year ended December 31, 2011. Warrants outstanding at January 2, 2010 were classified as equity. Upon the exercise of warrants in 2010, the Company issued new shares from its authorized shares.