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Stockholders' Equity (Stock-Based Compensation Narrative) (Details) (USD $)
 3 Months Ended 6 Months Ended 12 Months Ended
Dec. 29, 2012
Jun. 29, 2013
Jun. 30, 2012
Dec. 29, 2012
Ascendiant Capital Markets LLC [Member]
Dec. 31, 2011
Ascendiant Capital Markets LLC [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Proceeds from sale of shares $ 1,300,000 $ 28,000 $ 3,618,000 $ 3,900,000 $ 1,900,000
Shares issued during the period 1,685,394     1,312,669 697,470
Number of shares cancelled   11,386 23,631    
Value of shares cancelled   7,500 64,000    
Common stock pursuant to awards, shares authorized   6,605,566      
Automatic annual increase in shares authorized as percentage of common stock outstanding   5.00%      
Automatic annual increase in shares authorized, subject to adjustment for corporate actions   1,200,000      
Rate of vesting of options granted   25.00%      
Vesting period of options granted, in years   4 years      
Intrinsic value of options exercised during the period   41,392      
Expiration of vested options, period from date of grant   10 years      
Restricted stock vested, fair value on grant date   30,000 200,000    
Unearned stock-based compensation related to unvested common stock options and restricted stock awards   $ 3,100,000      
Weighted-average period over which unearned stock-based compensation is expected to be recognized   2 years 4 months 24 days