Income Taxes (Details 7) $ in Thousands, € in Millions	1 Months Ended		12 Months Ended
	Mar. 31, 2015 EUR (€)	Mar. 31, 2015 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Apr. 30, 2014 EUR (€)	Apr. 30, 2014 USD ($)
Tax Credit Carryforward [Line Items]
Deferred Tax Assets, Valuation Allowance			$ 923	$ 3,862	€ 3.2	$ 4,400
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount	€ (3.2)	$ (3,300)
Domestic Tax Authority
Tax Credit Carryforward [Line Items]
Tax Credit Carryforward, Expiration Date			Dec. 31, 2031
Domestic Tax Authority | Research and Development Tax Credit
Tax Credit Carryforward [Line Items]
Tax Credit Carryforward, Amount			$ 6,000
Domestic Tax Authority | AMT
Tax Credit Carryforward [Line Items]
Tax Credit Carryforward, Amount			500
State and Local Jurisdiction | California Franchise Tax Board | Research and Development Tax Credit
Tax Credit Carryforward [Line Items]
Tax Credit Carryforward, Amount			$ 10,700