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Accounts receivable, net | 12 Months Ended
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Dec. 31, 2017
Accounts receivable, net [Abstract] |
Accounts receivable, net |
6. | Accounts receivable, net
(In thousands) |  | December 31, 2016 |  | December 31, 2017 |
Accounts receivable |  |  | 14,655 |  |  | 40,663 |
Less: Allowance for doubtful accounts |  |  | (119) |  |  | (31) |
Accounts receivable, net |  |  | 14,536 |  |  | 40,632 |
The following table presents movement in the allowance for doubtful accounts:
(In thousands) |  | December 31, 2015 |  | December 31, 2016 |  | December 31, 2017 |
Balance at beginning of the year |  |  | 131 |  |  | 126 |  |  | 119 |
Additions |  |  | 4 |  |  | — |  |  | 27 |
Write-off |  |  | — |  |  | — |  |  | (122) |
Exchange difference |  |  | (9) |  |  | (7) |  |  | 7 |
Balance at end of the year |  |  | 126 |  |  | 119 |  |  | 31 |
The top 10 customers accounted for about 76% and 86% of accounts receivable as of December 31, 2016 and 2017, respectively.

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