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Accrued Expenses (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Accrued Expenses    
Accrued clinical trial expenses $ 4,331 $ 2,113
Accrued compensation 4,302 4,317
Accrued professional fees 1,202 542
Accrued technical operation expenses 702 762
Accrued interest payable 199 258
Accrued construction costs 57 1,500
Other accrued expenses 202 146
Total accrued expenses $ 10,995 $ 9,638