Net Loss Per Common Share - Computation of Basic and Diluted Net Loss Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Numerator:
Net loss	$ (1,732)	$ (4,256)
Denominator:
Weighted-average common shares outstanding used to calculate net loss per common share, basic and diluted	18,055,693	17,097,999
Net loss per common share, basic and diluted	$ (0.10)	$ (0.25)