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Stock Options Narrative (Details) (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Stock Options [Member]
     
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]      
Number of stock options outstanding 1,757,000 750,000 1,260,000
Intrinsic value of vested options $ 107,000 $ 205,000  
Intrinsic value of unvested options 0 50,000  
Unrecognized stock-based compensation expense for stock options 2,414,000    
Unrecognized stock-based compensation expense, stock options, upon change in control, value 2,135,000    
Unrecognized stock-based compensation expense, stock options, upon change in control, shares 950,000    
Unrecognized stock-based compensation expense, stock options, amortized for weighted average period $ 279,000    
Weighted average period for amortization of unrecognized stock-based compensation, stock options 1 year 8 months 12 days    
Less than 10% Stockholder [Member] | Employees [Member]
     
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]      
Stockholder's ownership interest 10.00%    
Incentive stock options, exercise price, percent of fair value (less than) 100.00%    
10% or more Stockholder [Member] | Employees [Member]
     
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]      
Stockholder's ownership interest 10.00%    
Incentive stock options, exercise price, percent of fair value (less than) 110.00%    
Stock Incentive Plan, 2007 [Member] | Stock Options [Member]
     
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]      
Number of shares reserved for issuance 3,010,000    
Number of stock options outstanding 1,332,000    
Number of shares available for grant 321,000    
Stock Incentive Plan, 2000 [Member] | Stock Options [Member]
     
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]      
Number of shares reserved for issuance 1,100,000    
Number of stock options outstanding 435,000