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Quarterly financial information (Unaudited) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013
Quarterly Financial Information Details
Revenue	$ 687us-gaap_Revenues	$ 968us-gaap_Revenues	$ 611us-gaap_Revenues	$ 1,219us-gaap_Revenues	$ 1,217us-gaap_Revenues	$ 964us-gaap_Revenues	$ 1,870us-gaap_Revenues	$ 1,801us-gaap_Revenues	$ 3,485us-gaap_Revenues	$ 5,852us-gaap_Revenues
Gross margin	178us-gaap_GrossProfit	600us-gaap_GrossProfit	443us-gaap_GrossProfit	1,220us-gaap_GrossProfit	1,164us-gaap_GrossProfit	880us-gaap_GrossProfit	1,007us-gaap_GrossProfit	1,000us-gaap_GrossProfit	2,441us-gaap_GrossProfit	4,051us-gaap_GrossProfit
Net loss	$ (3,346)us-gaap_NetIncomeLoss	$ (3,355)us-gaap_NetIncomeLoss	$ (3,401)us-gaap_NetIncomeLoss	$ (8,018)us-gaap_NetIncomeLoss	$ (2,421)us-gaap_NetIncomeLoss	$ (3,667)us-gaap_NetIncomeLoss	$ (3,436)us-gaap_NetIncomeLoss	$ (3,654)us-gaap_NetIncomeLoss	$ (18,120)us-gaap_NetIncomeLoss	$ (13,178)us-gaap_NetIncomeLoss
Net loss per share - basic and diluted	$ (0.08)	$ (0.08)	$ (0.08)	$ (0.23)	$ (0.08)	$ (0.13)	$ (0.13)	$ (0.14)

The amount of net income (loss) from continuing operations per each share of common stock or unit outstanding during the reporting period.

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.