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Short-term and long-term investments (Tables) | 12 Months Ended
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Dec. 31, 2014
Investments, Debt and Equity Securities [Abstract] |
Composition of Short-Term and Long -Term Investments | The composition of short-term and long-term investments is as follows:
|  | December 31, |  |  | December 31, |
|  | 2014 |  |  | 2013 |
Short-term investments |  |  |  |  |  |  |  |
Time Deposits |  | $ | 58,475,057 |  |  | $ | 66,677,156 |
Sovereign Debt Securities |  |  | 4,721,440 |  |  |  | 5,520,193 |
Corporate Debt Securities |  |  | 81,810,731 |  |  |  | 4,395,865 |
Certificates of deposits |  |  | 3,802,311 |  |  |  | — |
Total |  | $ | 148,809,539 |  |  | $ | 76,593,214 |
Long-term investments |  |  |  |  |  |  |  |
Sovereign Debt Securities |  |  | 44,428,490 |  |  |  | 24,875,697 |
Corporate Debt Securities |  |  | 156,832,560 |  |  |  | 20,844,040 |
Certificates of deposits |  |  | 4,003,992 |  |  |  | — |
Total |  | $ | 205,265,042 |  |  | $ | 45,719,737 |

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