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Accrued Liabilities (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Accrued liabilities    
Accrued compensation and related costs $ 1,661 $ 2,027
Accrued inventory costs 2,323 1,417
Accrued contract and other accrued expenses 2,591 2,381
Total accrued liabilities $ 6,575 $ 5,825