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Segment Information and Foreign Operations - Segment and Geographical Information (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2019
USD ($)
segment
Mar. 31, 2018
USD ($)
Dec. 31, 2018
USD ($)
Revenues from External Customers and Long-Lived Assets [Line Items]      
Number of operating segments | segment 1    
Net revenues reported for products shipped to customers in corresponding geographic region [Abstract]      
Revenue $ 20,208 $ 24,419  
Long-lived assets by geographic region, net of depreciation:      
Long-lived assets 86,011   $ 82,280
Reportable Geographical Components | China      
Net revenues reported for products shipped to customers in corresponding geographic region [Abstract]      
Revenue 7,111 7,183  
Long-lived assets by geographic region, net of depreciation:      
Long-lived assets 84,510   81,835
Reportable Geographical Components | Europe (primarily Germany)      
Net revenues reported for products shipped to customers in corresponding geographic region [Abstract]      
Revenue 4,375 6,393  
Reportable Geographical Components | Taiwan      
Net revenues reported for products shipped to customers in corresponding geographic region [Abstract]      
Revenue 3,008 5,049  
Reportable Geographical Components | North America (primarily the United States)      
Net revenues reported for products shipped to customers in corresponding geographic region [Abstract]      
Revenue 2,738 1,845  
Long-lived assets by geographic region, net of depreciation:      
Long-lived assets 1,501   $ 445
Reportable Geographical Components | Japan      
Net revenues reported for products shipped to customers in corresponding geographic region [Abstract]      
Revenue 1,792 2,455  
Reportable Geographical Components | Asia Pacific (excluding China, Taiwan, and Japan)      
Net revenues reported for products shipped to customers in corresponding geographic region [Abstract]      
Revenue $ 1,184 $ 1,494