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Investments (Tables) | 12 Months Ended
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Dec. 31, 2012
Investments, Debt and Equity Securities [Abstract] |
Summary of investments | The following is a summary of investments as of December 31, 2012 and 2011:
|  |  | 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 |
|  |  | As of December 31, 2011
| Contractual Maturity (in years) | Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Market Value
Mutual funds | Less than 1 |  | $ | 6,000,000 |  |  | $ | 37,115 |  |  | $ | — |  |  | $ | 6,037,115 |
Certificates of deposit | Less than 1 |  | 5,771,000 |  |  | — |  |  | (2,696 | ) |  | 5,768,304 |
Municipal bonds | Less than 1 |  | 1,056,614 |  |  | 1,387 |  |  | — |  |  | 1,058,001 |
Total investments |  |  | $ | 12,827,614 |  |  | $ | 38,502 |  |  | $ | (2,696 | ) |  | $ | 12,863,420 |

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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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