Consolidated Statements of Operations - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Income Statement [Abstract]
Product revenue	$ 7,061	$ 7,056
Operating costs and expenses:
Cost of product revenue	2,234	2,722
Research and product development expenses	1,149	1,243
Selling, general and administrative expenses	3,090	3,452
Operating income (loss)	588	(361)
Other expense, net	0	(7)
Income (loss) before income taxes	588	(368)
Income tax (expense) benefit	(6)	9
Net income (loss)	$ 582	$ (359)
Income (loss) per share (Basic)	$ 0.06	$ (0.06)
Income (loss) per share (Diluted)	$ 0.06	$ (0.06)
Weighted average shares outstanding (Basic)	9,129,178	5,988,545
Weighted average shares outstanding (Diluted)	9,332,676	5,988,545