Nature of Operations, Basis of Presentation and Significant Accounting Policies - Schedule of Computation of Net Loss Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Sep. 30, 2019	Sep. 30, 2018
Accounting Policies [Abstract]
Net loss	$ (2,556)	$ (2,780)	$ (2,558)	$ (7,779)	$ (4,648)	$ (1,361)	$ (7,894)	$ (13,788)
Preferred stock dividends	(389)			(379)			(1,128)	(650)
Net Loss allocable to common stock holders	$ (2,945)			$ (8,158)			$ (9,022)	$ (14,438)
Weighted average common shares outstanding used to compute net loss per share, basic and diluted (in dollars per share)	10,869,530			11,241,684			10,830,816	10,864,036
Net loss per share (in dollar per share)	$ (0.27)			$ (0.73)			$ (0.83)	$ (1.33)