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Intangible Assets, Net
9 Months Ended
Sep. 30, 2020
Intangible Assets, Net [Abstract]  
Intangible Assets, net
10. Intangible Assets, net

 

Intangible assets as of December 31, 2019 and September 30, 2020 consisted of the followings:

 

   December 31,   September 30, 
   2019   2020 
Computer software at cost  $30,648   $31,429 
Accumulated amortization   (15,470)   (19,422)
   $15,178   $12,007 

 

Amortization expenses were $1,291 and $870 for the three months ended September 30, 2019 and 2020 and $4,195 and $3,452 for the nine months ended September 30, 2019 and 2020, respectively.