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Net Loss Per Share (Tables)
 12 Months Ended
Dec. 31, 2016
Earnings Per Share [Abstract]  
Schedule of basic and diluted net loss per share
     
Years ended December 31,
  
     
2015
    
2016
  
Numerator:      
Basic and diluted net loss per common share
       $ (14,543)         $ (11,991)    
Denominator:      
Weighted-average number of common shares used in loss per share – basic and diluted
         2,713,096           3,424,976    
Loss per share – basic and diluted
       $ (5.36)         $ (3.50)    
 
Schedule of company's potential anti dilutive securities
​ ​ ​
Year ended December 31,
 ​
​ ​ ​
2015
 ​ ​
2016
 ​
Stock options
 ​ ​ ​ ​ 206,298 ​ ​ ​ ​ ​ 389,378 ​ ​
Convertible preferred stock
 ​ ​ ​ ​ 1,698 ​ ​ ​ ​ ​ 1,698 ​ ​
Common stock warrants
 ​ ​ ​ ​ 45,343 ​ ​ ​ ​ ​ — ​ ​
Total shares excluded from calculation
 ​ ​ ​ ​ 253,340 ​ ​ ​ ​ ​ 391,076 ​ ​
​