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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 |  |  |

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