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Investments (Tables) | 12 Months Ended
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Dec. 31, 2014
Investment | The following table summarizes the Group’s investment balances:
|  | As of December 31, |
|  | 2013 |  |  | 2014 |
|  | $ |  |  | $ |
Short-term investments |  |  |  |  |  |  |  |
- Trading securities investments |  |  |  |  |  |  |  |
- Fixed income products |  |  | 11,341,097 |  |  |  | — |
Total trading securities investments |  |  | 11,341,097 |  |  |  | — |
- Held-to-maturity investments |  |  |  |  |  |  |  |
- Fixed income products |  |  | 16,846,309 |  |  |  | 7,435,461 |
Total held-to-maturity investments |  |  | 16,846,309 |  |  |  | 7,435,461 |
- Available-for-sale investments |  |  |  |  |  |  |  |
- Fixed income products |  |  | — |  |  |  | 14,357,845 |
- Other products |  |  | — |  |  |  | 388,706 |
Total available-for-sale investments |  |  | — |  |  |  | 14,746,551 |
Total short-term investments |  |  | 28,187,406 |  |  |  | 22,182,012 |
Long-term investments |  |  |  |  |  |  |  |
- Held-to-maturity investments |  |  |  |  |  |  |  |
- Fixed income products |  |  | 10,480,964 |  |  |  | 483,512 |
- Other products |  |  | — |  |  |  | 4,673,952 |
Total held-to-maturity investments |  |  | 10,480,964 |  |  |  | 5,157,464 |
- Other long-term investments |  |  |  |  |  |  |  |
- Private equity funds products |  |  | 3,197,218 |  |  |  | 2,488,476 |
- Other products |  |  | — |  |  |  | 2,224,999 |
Total Other long-term investments |  |  | 3,197,218 |  |  |  | 4,713,475 |
Total long-term investments |  |  | 13,678,182 |  |  |  | 9,870,939 |
Total investments |  |  | 41,865,588 |  |  |  | 32,052,951 |

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- Definition Tabular disclosure of all investments in certain debt and equity securities for which the entity has the positive intent and ability to hold until maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5086-111524 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27337-111563 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62557-112803 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62586-112803 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=6435544&loc=d3e41834-113960 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27405-111563 + Details
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