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Segment Information (Tables)
12 Months Ended
Dec. 31, 2021
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
 
    
2019
    
2020
    
2021
 
    
US$
    
US$
    
US$
 
Mobile Storage
     441,700        532,682        910,569  
Mobile Communications
     10,356        —          —    
Others
     5,197        6,839        11,531  
    
 
 
    
 
 
    
 
 
 
       457,253        539,521        922,100  
    
 
 
    
 
 
    
 
 
 
Revenue by Geographic Area
Revenue is attributed to a geographic area based on the
bill-to
location and is summarized as follows:
 
    
Year Ended December 31
 
    
2019
    
2020
    
2021
 
    
US$
    
US$
    
US$
 
Taiwan
     77,117        95,023        159,575  
United States
     63,432        42,099        53,517  
Korea
     52,885        24,261        21,569  
China
     123,261        154,789        286,605  
Malaysia
     50,663        46,319        73,264  
Singapore
     45,032        97,813        219,214  
Others
     44,863        79,217        108,356  
    
 
 
    
 
 
    
 
 
 
       457,253        539,521        922,100  
    
 
 
    
 
 
    
 
 
 
Major customers representing at least 10% of net sales
Major customers representing at least 10% of net sales are as follows:
 
    
Year Ended December 31
 
    
2019
    
2020
    
2021
 
    
US$
    
%
    
US$
    
%
    
US$
    
%
 
Intel
     75,608        16        *        *        94,781        10  
Micron
     67,682        15        127,708        24        243,204        26  
 
*
Less than 10%
Long-Lived Assets (Property and Equipment, Net) by Geographic Area
Long-lived assets (property and equipment, net) by geographic area are as follows:
 
    
Year Ended December 31
 
    
2019
    
2020
    
2021
 
    
US$
    
US$
    
US$
 
Taiwan
     94,996        102,420        111,341  
China
     3,117        2,770        12,518  
Others
     375        306        619  
    
 
 
    
 
 
    
 
 
 
       98,488        105,496        124,478