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Investments (Tables) | 9 Months Ended
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Sep. 30, 2016
Investments, Debt and Equity Securities [Abstract] |
Summary of investments | The following is a summary of available-for-sale securities as of September 30, 2016 and December 31, 2015:
|  |  | As of September 30, 2016
| Contractual Maturity (in years) | Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Market Value
Mutual funds | --- |  | $ | 70,053,356 |  |  | $ | 244,865 |  |  | $ | (62,554 | ) |  | $ | 70,235,667 |
US corporate debt securities | Less than 2 |  | 26,221,990 |  |  | 15,380 |  |  | (37,452 | ) |  | 26,199,918 |
Investment in affiliated entity (PLS) | --- |  | — |  |  | 4,537,761 |  |  | — |  |  | 4,537,761 |
Total investments |  |  | $ | 96,275,346 |  |  | $ | 4,798,006 |  |  | $ | (100,006 | ) |  | $ | 100,973,346 |
|  |  | 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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