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Cash and Cash Equivalents (Tables) | 6 Months Ended
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Jun. 30, 2019
Cash and Cash Equivalents [Abstract] |
Cash and Cash Equivalents by Geographic Region | Cash and cash equivalents were held in the following geographic regions:
(In thousands) | June 30, 2019 |  | December 31, 2018
United States | $ | 6,996 |  |  | $ | 1,156 |
People's Republic of China ("PRC") | 12,967 |  |  | 20,885 |
Asia (excluding the PRC) | 10,264 |  |  | 2,398 |
Europe | 9,166 |  |  | 19,907 |
South America | 10,172 |  |  | 8,861 |
Total cash and cash equivalents | $ | 49,565 |  |  | $ | 53,207 |

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