Operating Segment, Geographic and Significant Customer Information - Additional Information (Detail) |
12 Months Ended | ||
---|---|---|---|
Dec. 31, 2019
Customer
Segment
|
Dec. 31, 2018
Customer
|
Dec. 31, 2017 |
|
Segment Reporting Information [Line Items] | |||
Operating segments | Segment | 4 | ||
Number of customer accounted for more than ten percent of consolidated revenue | Customer | 0 | 0 | |
Consolidated Revenue | |||
Segment Reporting Information [Line Items] | |||
Concentration risk, percentage | 10.00% | 10.00% | |
Semiconductor Test | Consolidated Revenue | Customer Concentration Risk | |||
Segment Reporting Information [Line Items] | |||
Concentration risk, percentage | 10.00% | 13.00% | 22.00% |
Semiconductor Test | Customer 1 | Consolidated Revenue | Revenue from Rights Concentration Risk | |||
Segment Reporting Information [Line Items] | |||
Concentration risk, percentage | 11.00% | 4.00% | |
Semiconductor Test | Customer 2 | Consolidated Revenue | Revenue from Rights Concentration Risk | |||
Segment Reporting Information [Line Items] | |||
Concentration risk, percentage | 13.00% |