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Stock Incentive Plans (Narrative) (Details) (USD $)
In Millions, except Share data, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Dec. 31, 2011
Stock Incentive Plans [Abstract]        
Options to purchase shares of common stock outstanding   358,373   578,257
Common stock available for future grants or awards   568,429    
Per-share fair value of stock options granted $ 1.7   $ 1.7  
Unrecognized compensation cost related to unvested stock options   $ 0.2    
Unrecognized compensation cost related to unvested stock options, recognition period   1 year 9 months 18 days    
Closing market price   $ 0.28    
Common stock reserved for issuance   65,000    
Shares issued under ESPP   18,141    
ESPP price as a percent of fair market value   85.00%