XML 99 R20.htm IDEA: XBRL DOCUMENT
v2.4.0.8

Investments (Tables) | 6 Months Ended
--- | ---
Jun. 30, 2013
Investments, Debt and Equity Securities [Abstract] |
Summary of investments | The following is a summary of investments as of June 30, 2013 and December 31, 2012:
|  |  | As of June 30, 2013
| Contractual Maturity (in years) | Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Market Value
Mutual funds | Less than 1 |  | $ | 13,191,964 |  |  | $ | — |  |  | $ | (84,185 | ) |  | $ | 13,107,779 |
Total investments |  |  | $ | 13,191,964 |  |  | $ | — |  |  | $ | (84,185 | ) |  | $ | 13,107,779 |
|  |  | 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 |

X
- Details
Name: | us-gaap_InvestmentsDebtAndEquitySecuritiesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the reconciliation of available-for-sale securities from cost basis to fair value. + References No definition available. + Details
Name: | us-gaap_ScheduleOfAvailableForSaleSecuritiesReconciliationTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration