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Investments | 6 Months Ended
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Jun. 30, 2015
Investments, Debt and Equity Securities [Abstract] |
Investments | Investments Investments consist of mutual funds, United States corporate debt securities and municipal bonds at June 30, 2015 and mutual funds and United States corporate debt securities at December 31, 2014. The Company classifies all investments as available-for-sale, as the sale of such investments may be required prior to maturity to implement management strategies. Available-for-sale securities are recorded at fair value, based on current market valuations. Unrealized gains and losses on available-for-sale securities are excluded from earnings and are reported as a separate component of other comprehensive loss until realized. Realized gains and losses are included in non-operating other income (expense) on the condensed consolidated statement of operations and are derived using the specific identification method for determining the cost of the securities sold. During the three and six months ended June 30, 2015 and 2014, a minimal amount of net realized loss on investments was recorded. Interest and dividends on investments classified as available-for-sale are included in interest and other income, net, in the condensed consolidated statements of operations. As of June 30, 2015, the Company had 51 available-for-sale securities in a gross unrealized loss position of which 4 were in such position for longer than 12 months. There were no impairments considered to be other-than-temporary as the Company has the ability and intent to hold the securities until recovery of the cost basis. The following is a summary of short-term investments as of June 30, 2015 and December 31, 2014:
|  |  | As of June 30, 2015
| Contractual Maturity (in years) | Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Market Value
Mutual funds | --- |  | $ | 58,532,030 |  |  | $ | — |  |  | $ | (296,239 | ) |  | $ | 58,235,791 |
US corporate debt securities | Less than 2 |  | 25,983,647 |  |  | 4,085 |  |  | (31,741 | ) |  | 25,955,991 |
Municipal bonds | Less than 1 |  | 104,336 |  |  | — |  |  | (297 | ) |  | 104,039 |
Total investments |  |  | $ | 84,620,013 |  |  | $ | 4,085 |  |  | $ | (328,277 | ) |  | $ | 84,295,821 |
|  |  | 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 |

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