Income taxes (Details 1) $ in Thousands	12 Months Ended
	Dec. 31, 2015 USD ($)
Federal Tax [Member]
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards	$ 36,306
Operating Loss Carry forwards Expiration Dates	Fiscal 2023
Domestic Tax Authority [Member]
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards	$ 20,739
Operating Loss Carry forwards Expiration Dates	Fiscal 2031
Federal Capital [Member]
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards	$ 553
Operating Loss Carry forwards Expiration Dates	Fiscal 2015