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Investments | 9 Months Ended
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Sep. 30, 2013
Investments, Debt and Equity Securities [Abstract] |
Investments | Investments Investments consist of mutual funds at September 30, 2013 and of certificates of deposit, mutual funds, and municipal bonds at December 31, 2012. 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. These investments are carried at fair value, with the unrealized gains and losses reported as a component of accumulated other comprehensive income (loss) until realized. A decline in the market value of any investment below cost that is determined to be other-than-temporary will result in a revaluation of its carrying amount to fair value. The impairment is charged to earnings and a new cost basis for the investment is established. No such impairment charges were recorded during the three and nine months ended September 30, 2013. The following is a summary of investments as of September 30, 2013 and December 31, 2012:
|  |  | As of September 30, 2013
| Contractual Maturity (in years) | Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Market Value
Mutual funds | Less than 1 |  | $ | 13,191,964 |  |  | $ | — |  |  | $ | (87,101 | ) |  | $ | 13,104,863 |
Total investments |  |  | $ | 13,191,964 |  |  | $ | — |  |  | $ | (87,101 | ) |  | $ | 13,104,863 |
|  |  | As of December 31, 2012
| Contractual Maturity (in years) | Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Market Value
Mutual funds | Less than 1 |  | $ | 7,500,063 |  |  | $ | 83,868 |  |  | $ | — |  |  | $ | 7,583,931 |
Certificates of deposit | Less than 1 |  | 250,000 |  |  | — |  |  | — |  |  | 250,000 |
Municipal bonds | Less than 1 |  | 201,470 |  |  | — |  |  | (1,400 | ) |  | 200,070 |
Total investments |  |  | $ | 7,951,533 |  |  | $ | 83,868 |  |  | $ | (1,400 | ) |  | $ | 8,034,001 |

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