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Accrued Liabilities (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Accrued Liabilities abstract    
Accrued Clinical Trial Costs Current $ 1,313 $ 3,335
Accrued compensation 3,921 2,492
Accrued sales and marketing expenses 1,166 1,315
Interest payable 2,813 213
Other accrued liabilities 2,905 505
Total $ 12,118 $ 7,860