Quarterly report pursuant to Section 13 or 15(d)

Segment Reporting and Geographic Information - Additional Information (Details)

v3.19.3
Segment Reporting and Geographic Information - Additional Information (Details)
3 Months Ended
Sep. 30, 2019
customer
segment
Sep. 30, 2018
customer
Jun. 30, 2019
customer
Segment Reporting and Geographic Information      
Number of reportable segments 4    
Number of customers with significant revenue | customer 2 2  
Segment percent of total revenues 100.00% 100.00%  
Number of customers with significant accounts receivable | customer 1   1
Customer One      
Segment Reporting and Geographic Information      
Segment percent of total revenues 17.00% 15.00%  
Customer Two      
Segment Reporting and Geographic Information      
Segment percent of total revenues 12.00% 10.00%  
Semiconductor Process Control      
Segment Reporting and Geographic Information      
Number of operating segments 2    
Specialty Semiconductor Process      
Segment Reporting and Geographic Information      
Number of operating segments 1    
PCB, Display and Component Inspection      
Segment Reporting and Geographic Information      
Number of operating segments 2    
Other      
Segment Reporting and Geographic Information      
Number of operating segments 1