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Cash and Cash Equivalents
 3 Months Ended
Mar. 31, 2021
Cash and Cash Equivalents [Abstract]  
Cash and Cash Equivalents Cash and Cash Equivalents
Cash and cash equivalents were held in the following geographic regions:
(In thousands)March 31, 2021December 31, 2020
North America$5,618 $9,812 
People's Republic of China ("PRC")13,94114,244
Asia (excluding the PRC)12,45113,518
Europe15,31910,926
South America8,0348,653
Total cash and cash equivalents
$55,363 $57,153