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Prepaid Expenses and Other Current Assets (Tables)
 12 Months Ended
Dec. 31, 2015
Prepaid Expense and Other Assets, Current [Abstract]  
Schedule of prepaid expenses and other current assets
​ ​ ​
December 31,
 ​
​ ​ ​
2014
 ​ ​
2015
 ​
Research and development tax credit receivable
 ​ ​ ​ $ 3,017 ​ ​ ​ ​ $ 2,093 ​ ​
Prepayments
 ​ ​ ​ ​ 902 ​ ​ ​ ​ ​ 893 ​ ​
Grant receivable
 ​ ​ ​ ​ 134 ​ ​ ​ ​ ​ 326 ​ ​
VAT receivable
 ​ ​ ​ ​ 309 ​ ​ ​ ​ ​ 607 ​ ​
Deposits
 ​ ​ ​ ​ 132 ​ ​ ​ ​ ​ 132 ​ ​
Other current assets
 ​ ​ ​ ​ 146 ​ ​ ​ ​ ​ — ​ ​
​ ​ ​ ​ $ 4,640 ​ ​ ​ ​ $ 4,051 ​ ​
​