Nature of business, basis of presentation and summary of significant accounting policies (Details Textual) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012	Dec. 31, 2011
Nature Of Business Basis Of Presentation And Summary Of Significant Accounting Policies Textual [Abstract]
Accumulated deficit	$ (115,617)		$ (114,420)
Net Income (Loss) Attributable to Parent	(1,675)	(1,569)
Working capital deficit	762
Cash and Cash Equivalents, at Carrying Value	197	322	486	307
Treasury Stock, Value	$ 325		$ 325