Nature of business, basis of presentation and summary of significant accounting policies (Details Textual) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012	Dec. 31, 2011
Nature Of Business Basis Of Presentation And Summary Of Significant Accounting Policies Textual [Abstract]
Accumulated deficit	$ (116,798)		$ (116,798)		$ (114,420)
Net loss	(1,181)	(746)	(2,378)	(1,565)
Working capital deficit	581		581
Cash and Cash Equivalents, at Carrying Value	406	501	406	501	486	307
Treasury Stock, Value	$ 325		$ 325		$ 325