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Segment Information (Tables)
12 Months Ended
Dec. 31, 2020
Segment Reporting [Abstract]  
Revenue by Product Category
The Company groups its products into three categories, based on the markets in which they may be used. The following summarizes the Company’s revenue by product category:
    
Year Ended December 31
 
    
2018
    
2019
    
2020
 
    
US$
    
US$
    
US$
 
Mobile Storage
     494,012        441,700        532,682  
Mobile Communications
     30,163        10,356        —    
Others
     6,173        5,197        6,839  
    
 
 
    
 
 
    
 
 
 
       530,348        457,253        539,521  
    
 
 
    
 
 
    
 
 
 
Revenue by Geographic Area
Revenue is attributed to a geographic area based on the
bill-to
location. The following summarizes the Company’s revenue by geographic area:
 
    
Year Ended December 31
 
    
2018
(1)
    
2019
    
2020
 
    
US$
    
US$
    
US$
 
Taiwan
     70,984        77,117        95,023  
United States
     53,476        63,432        42,099  
Korea
     135,845        52,885        24,261  
China
     142,948        123,261        154,789  
Malaysia
     49,444        50,663        46,319  
Singapore
     35,387        45,032        97,813  
Others
     42,264        44,863        79,217  
    
 
 
    
 
 
    
 
 
 
       530,348        457,253        539,521  
    
 
 
    
 
 
    
 
 
 
Major customers representing at least 10% of net sales
Major customers representing at least 10% of net sales
 
    
Year Ended December 31
 
    
2018
    
2019
    
2020
 
    
US$
    
%
    
US$
    
%
    
US$
    
%
 
Intel
     67,791        13        75,608        16        *        *  
Micron
     *        *        67,682        15        127,708        24  
SK Hynix
     111,265        21        *        *        *        *  
 
*
Less than 10%
Long-Lived Assets (Property and Equipment, Net) by Geographic Area
Long-lived assets (property and equipment, net) by geographic area were as follows:
 
    
Year Ended December 31
 
    
2018
    
2019
    
2020
 
    
US$
    
US$
    
US$
 
Taiwan
     96,920        94,996        102,420  
United States
     348        315        254  
Korea
     1,645        23        11  
China
     2,447        3,117        2,770  
Japan
     50        37        41  
    
 
 
    
 
 
    
 
 
 
       101,410        98,488        105,496