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Acquisition (Details) $ in Millions | Jan. 30, 2015 shares | Dec. 24, 2014 USD ($)
--- | --- | ---
SoLayTec, B.V. |  |
Business Acquisition [Line Items] |  |
Percentage of voting interests acquired |  | 51.00%
Purchase price consideration |  | $ 1.9
BTU International, Inc (BTU) Merger | Merger Agreement |  |
Business Acquisition [Line Items] |  |
Shares issued upon conversion | shares | 3,185,852 |
Parent Company | Merger Agreement |  |
Business Acquisition [Line Items] |  |
Exchange ratio | 0.3291 |

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