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Financial Instruments (Tables) | 3 Months Ended
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Mar. 31, 2015
Investments, Debt and Equity Securities [Abstract] |
Cash and Cash Equivalents Held in Investment Portfolio | The following table summarizes the fair value of our cash and cash equivalents held in our current investment portfolio:
|  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized (Losses) |  |  | Fair Value |
March 31, 2015 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash |  | $ | 2,655,834 |  |  | $ | — |  |  | $ | — |  |  | $ | 2,655,834 |
Cash equivalents |  |  | 11,490,067 |  |  |  | — |  |  |  | — |  |  |  | 11,490,067 |
Total cash and cash equivalents |  | $ | 14,145,901 |  |  | $ | — |  |  | $ | — |  |  | $ | 14,145,901 |
|  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized (Losses) |  |  | Fair Value |
December 31, 2014 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash |  | $ | 1,398,928 |  |  | $ | — |  |  | $ | — |  |  | $ | 1,398,928 |
Cash equivalents |  |  | 23,588,675 |  |  |  | — |  |  |  | — |  |  |  | 23,588,675 |
Total cash and cash equivalents |  | $ | 24,987,603 |  |  | $ | — |  |  | $ | — |  |  | $ | 24,987,603 |

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