Income Taxes (Details 2) $ in Thousands	12 Months Ended
	Dec. 31, 2017 USD ($)
Operating Loss Carryforwards [Line Items]
Tax loss carryforwards	$ 62,285
Tax Credit Carryforwards, Carryforward Period, Minimum	1 year
Tax Credit Carryforwards, Carryforward Period, Maximum	5 years
Tax credit carryforward (1-5 years)	$ 144
U.S. Federal
Operating Loss Carryforwards [Line Items]
Tax loss carryforwards	$ 3,224
Tax Credit Carryforwards, Carryforward Period, Maximum	20 years
State [Member]
Operating Loss Carryforwards [Line Items]
Tax Credit Carryforwards, Carryforward Period, Minimum	1 year
Tax Credit Carryforwards, Carryforward Period, Maximum	20 years
International [Member]
Operating Loss Carryforwards [Line Items]
Tax loss carryforwards	$ 46,255
Tax Credit Carryforwards, Carryforward Period, Minimum	1 year
Tax Credit Carryforwards, Carryforward Period, Maximum	20 years
International with Unlimited Carryforward Periods [Member]
Operating Loss Carryforwards [Line Items]
Tax loss carryforwards	$ 12,806