Net Loss Per Share (Computation of Loss Per Share) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Numerator:
Net loss	$ (3,577)	$ (3,334)	$ (9,150)	$ (7,077)
Denominator:
Weighted–average common shares outstanding, basic and diluted	16,269,808	14,867,947	15,851,106	14,854,139
Net loss per common share, basic and diluted (in USD per share)	$ (0.22)	$ (0.22)	$ (0.58)	$ (0.48)