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Stockholders' Equity (Deficit) (Tables)
 12 Months Ended
Dec. 31, 2016
Stockholders' Equity Note [Abstract]  
Schedule of common stock reserved for issuance
​ ​ ​
Year ended December 31,
 ​
​ ​ ​
2016
 ​ ​
2015
 ​
Common stock warrants
 ​ ​ ​ ​ 751,366 ​ ​ ​ ​ ​ 387,714 ​ ​
Options
 ​ ​ ​ ​ 2,049,517 ​ ​ ​ ​ ​ 1,909,911 ​ ​
Total
 ​ ​ ​ ​ 2,800,883 ​ ​ ​ ​ ​ 2,297,625 ​ ​
​