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Goodwill and Other Intangibles - Finite and Indefinite-Lived Intangible Assets (Detail) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Finite-lived intangible assets |  |  |
Gross Carrying Amount | $ 31,962 | $ 30,648 |
Accumulated Amortization | (17,519) | (15,532) |
Indefinite-lived intangible assets Goodwill | 29,508 | 27,840 | $ 15,621
Patents [Member] |  |  |
Finite-lived intangible assets |  |  |
Gross Carrying Amount | 4,806 | 4,806 |
Accumulated Amortization | (4,806) | (4,806) |
Land Use Rights [Member] |  |  |
Finite-lived intangible assets |  |  |
Gross Carrying Amount | 1,286 | 1,128 |
Accumulated Amortization | (396) | (331) |
Trademark [Member] |  |  |
Finite-lived intangible assets |  |  |
Gross Carrying Amount | 1,756 | 1,718 |
Accumulated Amortization | (1,474) | (1,358) |
Technology [Member] |  |  |
Finite-lived intangible assets |  |  |
Gross Carrying Amount | 7,673 | 7,185 |
Accumulated Amortization | (2,402) | (1,708) |
Customer Relationships [Member] |  |  |
Finite-lived intangible assets |  |  |
Gross Carrying Amount | 16,441 | 15,811 |
Accumulated Amortization | $ (8,441) | $ (7,329) |

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