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Investments (Tables) | 3 Months Ended
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Mar. 31, 2016
Investments, Debt and Equity Securities [Abstract] |
Summary of investments | The following is a summary of available-for-sale securities as of March 31, 2016 and December 31, 2015:
|  |  | As of March 31, 2016
| Contractual Maturity (in years) | Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Market Value
Mutual funds | --- |  | $ | 78,572,862 |  |  | $ | 113,561 |  |  | $ | (117,133 | ) |  | $ | 78,569,290 |
US corporate debt securities | Less than 2 |  | 26,509,854 |  |  | 11,272 |  |  | (27,766 | ) |  | 26,493,360 |
Municipal bonds | Less than 1 |  | 100,793 |  |  | — |  |  | (61 | ) |  | 100,732 |
Investment in affiliated entity (PLS) | --- |  | — |  |  | 5,026,917 |  |  | — |  |  | 5,026,917 |
Total investments |  |  | $ | 105,183,509 |  |  | $ | 5,151,750 |  |  | $ | (144,960 | ) |  | $ | 110,190,299 |
|  |  | As of December 31, 2015
| Contractual Maturity (in years) | Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Market Value
Mutual funds | --- |  | $ | 78,571,294 |  |  | $ | 435 |  |  | $ | (185,737 | ) |  | $ | 78,385,992 |
US corporate debt securities | Less than 2 |  | 26,923,855 |  |  | — |  |  | (54,452 | ) |  | 26,869,403 |
Municipal bonds | Less than 1 |  | 101,936 |  |  | — |  |  | (54 | ) |  | 101,882 |
Investment in affiliated entity (PLS) | --- |  | — |  |  | 5,045,915 |  |  | — |  |  | 5,045,915 |
Total investments |  |  | $ | 105,597,085 |  |  | $ | 5,046,350 |  |  | $ | (240,243 | ) |  | $ | 110,403,192 |

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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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