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Accrued Liabilities (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Accrued Liabilities    
Accrued compensation expenses $ 1,095 $ 1,962
Accrued Genzyme co-promotion fees 2,776 4,915
Accrued other 1,396 717
Accrued liabilities $ 5,267 $ 7,594