Net Loss Per Share - Basic and Diluted (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Numerator:
Net loss	$ (668)	$ (712)
Less: preferred stock dividends	3	3
Net loss attributable to common stockholders	$ (671)	$ (715)
Denominator:
Weighted-average number of shares of common stock for basic and diluted net loss per share (in shares)	36,181	35,456
Basic and diluted net loss per share (in dollars per share)	$ (0.02)	$ (0.02)