XML 54 R21.htm IDEA: XBRL DOCUMENT
v3.2.0.727

Investments (Tables) | 6 Months Ended
--- | ---
Jun. 30, 2015
Investments, Debt and Equity Securities [Abstract] |
Summary of investments | 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 |

X
- References No definition available. + 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