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Stock Plans - Ultratech Plan (Details) - Ultratech Plan - shares
12 Months Ended
May 17, 2017
Dec. 31, 2017
Dec. 31, 2019
Share-based compensation      
Shares that may be granted in future under Plan 0    
Restricted stock units      
Share-based compensation      
Awards converted (in shares)   338,144  
Vesting period   50 months  
Number of awards outstanding (in shares)     7,483