Nature of business, basis of presentation and summary of significant accounting policies (Details Textual) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012	Dec. 31, 2011
Nature Of Business Basis Of Presentation And Summary Of Significant Accounting Policies Textual [Abstract]
Accumulated deficit	$ (117,684)		$ (117,684)		$ (114,420)
Net loss	(887)	(812)	(3,264)	(2,376)
Working capital deficit	1,417		1,417
Cash and Cash Equivalents, at Carrying Value	287	501	287	501	486	307
Treasury Stock, Value	$ 325		$ 325		$ 325