Net loss per share attributable to common stockholders (Tables)

12 Months Ended

Dec. 31, 2016

Earnings Per Share [Abstract]

Schedule of basic and diluted net loss per share

​	Year ended December 31,
​	2016			2015
Net loss	​	$	(2,554)	​	$	(8,501)
Weighted average shares outstanding	​	​	5,123,568	​	​	4,928,881
Basic and diluted loss per share	​	$	(0.50)	​	$	(1.72)

Schedule of common stock equivalents excluded from the computation of diluted net loss per share

​	Year ended December 31,
​	2016		2015
Weighted average shares outstanding:	​		​
Common stock warrants	​	687,599	​	359,868
Options	​	2,044,902	​	1,122,197
Total	​	2,732,501	​	1,482,065