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Accrued Expenses (Tables) | 12 Months Ended
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Dec. 31, 2015
Accrued Expenses |
Accrued Expenses |
|  | As of December 31, |
|  | 2015 |  | 2014 |
|  | (in thousands) |
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 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
|  | $ | 10,995 |  | $ | 9,638 |
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