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Intangible Assets, Net
12 Months Ended
Dec. 31, 2020
Intangible Assets, Net [Abstract]  
Intangible Assets, net
11. Intangible Assets, net

 

Intangible assets as of December 31, 2019 and 2020 consisted of the followings:

 

   December 31,   December 31, 
   2019   2020 
Computer software at cost  $30,648    32,686 
Accumulated amortization   (15,470)   (20,879)
   $15,178    11,807 

 

Amortization expenses were $5,482 and $4,143 for the years ended December 31, 2019 and 2020, respectively.