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Debt (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Debt    
Total Debt, Principal $ 7,475 $ 7,300
Total Debt, Unamortized Amount (66) (84)
Total debt 7,409 7,216
Debt - current, Principal (3,725) (2,554)
Debt, Unamortized current 33 35
Debt - current (3,692) (2,519)
Debt - non-current, Principal 3,750 4,746
Debt, Unamortized non-current (33) (49)
Debt - non-current 3,717 4,697
Comerica - Growth Capital Loan A, due 2015 [Member]
    
Debt    
Total Debt, Principal 5,000 5,000
Total Debt, Unamortized Amount (66) (84)
Total debt 4,934 4,916
Comerica - Revolving Line of Credit, due 2014 [Member]
    
Debt    
Total Debt, Principal 2,475 2,300
Total Debt, Unamortized Amount 0 0
Total debt $ 2,475 $ 2,300