Net Loss Per Share - Basic and Diluted (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Earnings Per Share [Abstract]
Net loss	$ (1,705)	$ (714)	$ (3,021)	$ (1,217)
Less: preferred stock dividends	3	5	9	15
Net loss attributable to common stockholders	$ (1,708)	$ (719)	$ (3,030)	$ (1,232)
Weighted-average number of shares of common stock for basic and diluted net loss per share (in shares)	35,492	35,393	35,480	35,441
Basic and diluted net loss per share (in dollars per share)	$ (0.05)	$ (0.02)	$ (0.09)	$ (0.03)