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Accounts receivable, net
12 Months Ended
Dec. 31, 2020
Accounts receivable, net  
Accounts receivable, net

7.            Accounts receivable, net

(In thousands)

    

December 31, 2019

    

December 31, 2020

Accounts receivable

 

35,137

 

32,312

Less: Allowance for credit losses

 

(7,604)

 

(9,329)

Accounts receivable, net

 

27,533

 

22,983

The following table presents movement in the allowance for expected credit loss:

(In thousands)

    

December 31, 2018

    

December 31, 2019

    

December 31, 2020

Balance at beginning of the year

 

31

 

7,709

 

7,604

Additions

 

7,680

 

19

 

1,137

Exchange difference

 

(2)

 

(124)

 

588

Balance at end of the year

 

7,709

 

7,604

 

9,329

The top 10 customers accounted for about 63% and 65% of accounts receivable as of December 31, 2019 and 2020, respectively.