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Intangible Assets, Net
9 Months Ended
Sep. 30, 2019
Intangible Assets, net [Abstract]  
Intangible Assets, net
10. Intangible Assets, net

 

Intangible assets as of December 31, 2018 and September 30, 2019 consisted of the followings:

 

   December 31,   September 30, 
   2018   2019 
Computer software at cost  $31,025   $29,850 
Accumulated amortization   (10,156)   (13,798)
   $20,869   $16,052 

 

Amortization expenses were $1,118 and $1,291 for the three months ended September 30, 2018 and 2019 and $2,515 and $4,195 for the nine months ended September 30, 2018 and 2019, respectively.