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Cash and Cash Equivalents and Restricted Cash (Tables) | 6 Months Ended
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Jun. 30, 2018
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, 2018 |  | December 31, 2017
United States | $ | 6,465 |  |  | $ | 10,489 |
People's Republic of China ("PRC") | 34,710 |  |  | 23,283 |
Asia (excluding the PRC) | 1,348 |  |  | 1,405 |
Europe | 8,139 |  |  | 18,071 |
South America | 8,771 |  |  | 9,190 |
Total cash and cash equivalents | $ | 59,433 |  |  | $ | 62,438 |

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