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Intangible Assets, Net
6 Months Ended
Jun. 30, 2020
Intangible Assets, Net [Abstract]  
Intangible Assets, net
10. Intangible Assets, net

 

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

 

   December 31,   June 30, 
   2019   2020 
Computer software at cost  $30,648   $30,205 
Accumulated amortization   (15,470)   (17,818)
   $15,178   $12,387 

 

Amortization expenses were $1,330 and $1,281 for the three months ended June 30, 2019 and 2020 and $2,904 and $2,582 for the six months ended June 30, 2019 and 2020, respectively.