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Accounts receivable, net | 12 Months Ended
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Dec. 31, 2019
Accounts receivable, net |
Accounts receivable, net | 6. Accounts receivable, net
(In thousands) |  | December 31, 2018 |  | December 31, 2019
Accounts receivable |  | 27,100 |  | 35,137
Less: Allowance for doubtful accounts |  | (7,709) |  | (7,604)
Accounts receivable, net |  | 19,391 |  | 27,533
The following table presents movement in the allowance for doubtful accounts:
(In thousands) |  | December 31, 2017 |  | December 31, 2018 |  | December 31, 2019
Balance at beginning of the year |  | 119 |  | 31 |  | 7,709
Additions |  | 27 |  | 7,680 |  | 19
Write-off |  | (122) |  | — |  | —
Exchange difference |  | 7 |  | (2) |  | (124)
Balance at end of the year |  | 31 |  | 7,709 |  | 7,604
The top 10 customers accounted for about 60% and 63% of accounts receivable as of December 31, 2018 and 2019, respectively.

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- Definition The entire disclosure for claims held for amounts due a entity, excluding financing receivables. Examples include, but are not limited to, trade accounts receivables, notes receivables, loans receivables. Includes disclosure for allowance for credit losses. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -URI http://asc.fasb.org/subtopic&trid=2196772 + Details
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- References No definition available. + Details
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