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Investments (Tables) | 12 Months Ended
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Dec. 31, 2014
Investments, Debt and Equity Securities [Abstract] |
Summary of investments | The following is a summary of short-term investments as of December 31, 2014 and 2013:
|  |  | As of December 31, 2014
| Contractual Maturity (in years) | Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Market Value
Mutual funds | --- |  | $ | 29,487,758 |  |  | $ | 2,667 |  |  | $ | (216,790 | ) |  | $ | 29,273,635 |
US corporate debt securities | Less than 2 |  | 23,839,606 |  |  | 70 |  |  | (37,337 | ) |  | 23,802,339 |
Total investments |  |  | $ | 53,327,364 |  |  | $ | 2,737 |  |  | $ | (254,127 | ) |  | $ | 53,075,974 |
|  |  | As of December 31, 2013
| Contractual Maturity (in years) | Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Market Value
Mutual funds | --- |  | $ | 18,178,518 |  |  | $ | — |  |  | $ | (78,614 | ) |  | $ | 18,099,904 |
Municipal bonds | Less than 1 |  | 805,144 |  |  | 560 |  |  | — |  |  | 805,704 |
Total investments |  |  | $ | 18,983,662 |  |  | $ | 560 |  |  | $ | (78,614 | ) |  | $ | 18,905,608 |

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- Definition Tabular disclosure of the reconciliation of available-for-sale securities from cost basis to fair value. + References No definition available. + Details
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