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Nature of business, basis of presentation and summary of significant accounting policies (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Cash and Cash Equivalents, at Carrying Value [Abstract]
Cash in bank	$ 775us-gaap_Cash	$ 945us-gaap_Cash
Money market funds
Cash and cash equivalents	$ 775	$ 945	$ 486

Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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