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Debt (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Debt    
Total debt, Principal $ 8,283 $ 7,300
Total debt, Unamortized amount (57) (84)
Total debt 8,226 7,216
Less: debt - current, Principal (4,950) (2,554)
Less: debt - current, Unamortized Discount 31 35
Less: debt - current (4,919) (2,519)
Debt - non-current, Principal 3,333 4,746
Debt - non-current, Unamortized Discount (26) (49)
Debt - non-current 3,307 4,697
Comerica - Growth Capital Loan A, due 2015 [Member]
    
Debt    
Total debt, Principal 5,000 5,000
Total debt, Unamortized amount (57) (84)
Total debt 4,943 4,916
Comerica - Revolving Line of Credit, due 2014 [Member]
    
Debt    
Total debt, Principal 3,283 2,300
Total debt, Unamortized amount 0 0
Total debt $ 3,283 $ 2,300