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Cash and Cash Equivalents and Restricted Cash (Tables)
 12 Months Ended
Dec. 31, 2018
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)
2018
 
2017
United States
$
1,156

 
$
10,489

People's Republic of China ("PRC")
20,885

 
23,283

Asia (excluding the PRC)
2,398

 
1,405

Europe
19,907

 
18,071

South America
8,861

 
9,190

Total cash and cash equivalents
$
53,207

 
$
62,438