Annual report pursuant to Section 13 and 15(d)

Acquisitions (Details)

v3.5.0.2
Acquisitions (Details)
$ in Millions
Jan. 30, 2015
shares
Dec. 24, 2014
USD ($)
BTU International, Inc (BTU) Merger    
Business Acquisition [Line Items]    
Exchange ratio 0.3291  
SoLayTec, B.V.    
Business Acquisition [Line Items]    
Percentage of voting interests acquired   51.00%
Purchase price | $   $ 1.9
Merger Agreement | BTU International, Inc (BTU) Merger    
Business Acquisition [Line Items]    
Percentage of voting interests acquired 100.00%  
The Company | Merger Agreement    
Business Acquisition [Line Items]    
Exchange ratio 0.3291  
BTU International, Inc (BTU) Merger | Merger Agreement    
Business Acquisition [Line Items]    
Conversion of stock, shares issued | shares 3,185,852