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v3.19.1

Basis of Presentation (Details) - company | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2018 | Mar. 11, 2019 | Mar. 10, 2019
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |  |  |
Number of equity method investments | 5 | 5 | 7 |  |
Beijing JiYa Semiconductor Material Co., Ltd |  |  |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |  |  |
Percentage of ownership, consolidated method (in hundredths) |  |  |  | 39.00% | 46.00%

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- Details
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