Subsequent events (Details Textual) (USD $) In Thousands, except Share data, unless otherwise specified	0 Months Ended
	Feb. 10, 2014	Apr. 07, 2014 Subsequent Event [Member]
Subsequent Event [Line Items]
Business Acquisition, Date of Acquisition Agreement		Apr. 07, 2014
Payments to Acquire Businesses, Gross		$ 600
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares		95,166
Business Acqusition, Indemnification Obligations, Number Of Shares Placed		47,583
Additional Lump Sum Payment	$ 15,000
Warrants Exchanged For Common Stock	52,500