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Segment Information and Foreign Operations - Segment and Geographical Information (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2021
USD ($)
segment
Sep. 30, 2020
USD ($)
Dec. 31, 2020
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 $ 34,576 $ 25,469 $ 99,661 $ 68,326  
Long-lived assets by geographic region, net of depreciation:          
Long-lived assets 134,018   134,018   $ 118,508
Reportable Geographical Components | China          
Net revenues reported for products shipped to customers in corresponding geographic region [Abstract]          
Revenue 16,959 10,568 48,051 23,045  
Long-lived assets by geographic region, net of depreciation:          
Long-lived assets 132,642   132,642   117,672
Reportable Geographical Components | Taiwan          
Net revenues reported for products shipped to customers in corresponding geographic region [Abstract]          
Revenue 3,825 3,333 11,836 12,908  
Reportable Geographical Components | Japan          
Net revenues reported for products shipped to customers in corresponding geographic region [Abstract]          
Revenue 3,393 2,233 8,551 5,265  
Reportable Geographical Components | Asia Pacific (excluding China, Taiwan, and Japan)          
Net revenues reported for products shipped to customers in corresponding geographic region [Abstract]          
Revenue 1,946 1,446 5,159 4,503  
Reportable Geographical Components | Europe (primarily Germany)          
Net revenues reported for products shipped to customers in corresponding geographic region [Abstract]          
Revenue 4,939 4,689 16,785 15,017  
Reportable Geographical Components | North America (primarily the United States)          
Net revenues reported for products shipped to customers in corresponding geographic region [Abstract]          
Revenue 3,514 $ 3,200 9,279 $ 7,588  
Long-lived assets by geographic region, net of depreciation:          
Long-lived assets $ 1,376   $ 1,376   $ 836