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Intangible Assets, net
6 Months Ended
Jun. 30, 2021
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangible Assets, net
12. Intangible Assets, net

 

Intangible assets as of December 31, 2020 and June 30, 2021 consisted of the followings:

 

   December 31,   June 30, 
   2020   2021 
Computer software at cost  $32,686   $33,042 
Accumulated amortization   (20,879)   (22,484)
   $11,807   $10,558 

 

Amortization expenses were $1,281 and $688 for the three months ended June 30, 2020 and 2021 and $2,582 and $1,374 for the six months ended June 30, 2020 and 2021, respectively.