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Accrued Expenses (Tables)
 12 Months Ended
Dec. 31, 2016
Accrued Liabilities, Current [Abstract]  
Schedule of accrued expenses
​ ​ ​
As of December 31,
 ​
​ ​ ​
2016
 ​ ​
2015
 ​
Offering Costs
 ​ ​ ​ $ 227 ​ ​ ​ ​ $ 227 ​ ​
Compensation
 ​ ​ ​ ​ 1,481 ​ ​ ​ ​ ​ 1,093 ​ ​
Board of Director Fees
 ​ ​ ​ ​ 182 ​ ​ ​ ​ ​ 120 ​ ​
Miscellaneous Accruals
 ​ ​ ​ ​ 295 ​ ​ ​ ​ ​ 877 ​ ​
Total Accrued Expenses
 ​ ​ ​ $ 2,185 ​ ​ ​ ​ $ 2,317 ​ ​
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