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Cash and Cash Equivalents (Tables) | 12 Months Ended
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Dec. 31, 2021
Cash and Cash Equivalents [Abstract] |
Cash and Cash Equivalents by Geographic Region | Cash and cash equivalents were held in the following geographic regions:
| December 31,
(In thousands) | 2021 |  | 2020
North America | $ | 6,430 |  |  | $ | 9,812 |
People's Republic of China ("PRC") | 16,000 |  |  | 14,244 |
Asia (excluding the PRC) | 11,798 |  |  | 13,518 |
Europe | 17,604 |  |  | 10,926 |
South America | 8,981 |  |  | 8,653 |
Total cash and cash equivalents | $ | 60,813 |  |  | $ | 57,153 |

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- Definition Tabular disclosure of the components of cash and cash equivalents. + References No definition available. + Details
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