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Credit Facility (Details) (USD $)
 9 Months Ended
Sep. 30, 2012
Dec. 31, 2011
Dec. 31, 2010
Line of Credit Facility [Line Items]      
Line of credit, non-current portion $ 927,000 $ 1,017,000  
Revolving Credit Facility
      
Line of Credit Facility [Line Items]      
Borrowing base amount available 29,000,000 30,000,000 20,000,000
Maximum borrowing capacity   50,000,000 40,000,000
Potential increase in borrowing capacity 20,000,000    
Borrowing base, component, % of eligible accounts receivable 80.00%    
Borrowing base, component, % of eligible inventory 50.00%    
Borrowing base, allowable share of total commitment amount attributable to inventory component 50.00%    
Borrowing base, component, % of eligible equipment inventory 75.00%    
Weighted average interest rate 1.50%    
LIBOR-based Rate | Revolving Credit Facility
      
Line of Credit Facility [Line Items]      
Variable rate, applicable margin 1.50%    
CB Floating Rate | Revolving Credit Facility
      
Line of Credit Facility [Line Items]      
Variable rate, applicable margin 1.25%    
Maximum | Revolving Credit Facility
      
Line of Credit Facility [Line Items]      
Maximum leverage ratio allowed 2.50    
Default trigger, certain defaults of other company indebtedness, amount 50,000    
Default trigger, rendering of certain judgments, amount $ 150,000    
Maximum | LIBOR-based Rate | Revolving Credit Facility
      
Line of Credit Facility [Line Items]      
Reference rate, number of allowable LIBOR-based borrowings outstanding 3    
Minimum | Revolving Credit Facility
      
Line of Credit Facility [Line Items]      
Minimum commitment coverage ratio allowed 2