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ALLOWANCE FOR DOUBTFUL RECEIVABLES | 12 Months Ended
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Dec. 31, 2011
ALLOWANCE FOR DOUBTFUL RECEIVABLES |
ALLOWANCE FOR DOUBTFUL RECEIVABLES |
4. ALLOWANCE FOR DOUBTFUL RECEIVABLES Allowance for doubtful receivables are comprised of allowances for account receivable trade and advances to suppliers. An analysis of allowances for accounts receivable, trade for the years ended December 31, 2009, 2010 and 2011 is as follows:
|  | 2009 |  | 2010 |  | 2011 |
--- | --- | --- | --- | --- | --- | --- | ---
|  | $ |  | $ |  | $ |
Beginning of the year |  |  | 5,605,983 |  |  | 18,029,440 |  |  | 7,956,036 |
Allowances made (reversed) during the year |  |  | 16,536,592 |  |  | (10,082,718 | ) |  | 6,552,926 |
Accounts written-off against allowances |  |  | (4,113,307 | ) |  | — |  |  | (5,053,538 | )
Foreign exchange effect |  |  | 172 |  |  | 9,314 |  |  | 50,057 |
Closing balance |  |  | 18,029,440 |  |  | 7,956,036 |  |  | 9,505,481 |
An analysis of allowances for advances to suppliers for the years ended December 31, 2009, 2010 and 2011 is as follows:
|  | 2009 |  | 2010 |  | 2011 |
--- | --- | --- | --- | --- | --- | --- | ---
|  | $ |  | $ |  | $ |
Beginning of the year |  |  | 2,341,685 |  |  | 10,985,195 |  |  | 19,389,542 |
Allowances made during the year |  |  | 8,641,316 |  |  | 10,239,858 |  |  | 17,728,681 |
Accounts written-off against allowances |  |  | — |  |  | (2,205,848 | ) |  | — |
Foreign exchange effect |  |  | 2,194 |  |  | 370,337 |  |  | 1,005,498 |
Closing balance |  |  | 10,985,195 |  |  | 19,389,542 |  |  | 38,123,721 |

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