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Cash and Cash Equivalents
 6 Months Ended
Jun. 30, 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)June 30, 2021December 31, 2020
North America$6,473 $9,812 
People's Republic of China ("PRC")18,61414,244
Asia (excluding the PRC)10,38213,518
Europe22,02110,926
South America10,2008,653
Total cash and cash equivalents
$67,690 $57,153