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Accounts payable and accrued expenses | 12 Months Ended
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Dec. 31, 2015
Accounts payable and accrued expenses |
Accounts payable and accrued expenses | 5. Accounts payable and accrued expenses Accounts payable and accrued expenses at December 31, 2015 and 2014 consist of the following:
|  | December 31, |
|  | 2015 |  | 2014 |
Employee compensation, benefits, and related accruals |  | $ | 11,187 |  | $ | 9,312 |
Consulting and contracted research |  |  | 13,753 |  |  | 9,349 |
Professional fees |  |  | 2,523 |  |  | 3,334 |
Accounts payable |  |  | 11,940 |  |  | 4,128 |
Other |  |  | 5,844 |  |  | 2,998 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
|  | $ | 45,247 |  | $ | 29,121 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​

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