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Accounts receivable, net | 12 Months Ended
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Dec. 31, 2014
Receivables [Abstract] |
Accounts receivable, net |
6. | Accounts receivable, net
(In thousands) |  | December 31, 2013 |  |  | December 31, 2014 |
Accounts receivable |  |  | 47,386 |  |  |  | 38,273 |
Less: Allowance for doubtful accounts |  |  | (12,111 | ) |  |  | (9,352 | )
Accounts receivable, net |  |  | 35,275 |  |  |  | 28,921 |
The accounts receivable that was fully reserved as of December 31, 2013 and 2014 was USD 10.9 million and USD 8.9 million, respectively. The following table presents movement in the allowance for doubtful accounts:
(In thousands) |  | December 31, 2012 |  |  | December 31, 2013 |  |  | December 31, 2014 |
Balance at beginning of the year |  |  | 4,150 |  |  |  | 7,875 |  |  |  | 12,111 |
Additions |  |  | 3,840 |  |  |  | 4,308 |  |  |  | 2,633 |
Reversals |  |  | (140 | ) |  |  | (373 | ) |  |  | (1,176 | )
Write-off |  |  | — |  |  |  | — |  |  |  | (4,161 | )
Exchange difference |  |  | 25 |  |  |  | 301 |  |  |  | (55 | )
Balance at end of the year |  |  | 7,875 |  |  |  | 12,111 |  |  |  | 9,352 |
The top 10 customers accounted for about 40% and 37% of accounts receivable as of December 31, 2013 and 2014, respectively.

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