XML 34 R24.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Investments (Tables) | 9 Months Ended
--- | ---
Sep. 30, 2018
Investments, Debt and Equity Securities [Abstract] |
Summary of investments | The following is a summary of available-for-sale securities as of September 30, 2018 and December 31, 2017:
|  |  | As of September 30, 2018
| Contractual Maturity (in years) | Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Market Value
Mutual funds | --- |  | $ | 65,154,422 |  |  | $ | 680 |  |  | $ | (280,113 | ) |  | $ | 64,874,989 |
US corporate debt securities | Less than 2 |  | 1,223,906 |  |  | — |  |  | (2,328 | ) |  | 1,221,578 |
Total investments |  |  | $ | 66,378,328 |  |  | $ | 680 |  |  | $ | (282,441 | ) |  | $ | 66,096,567 |
|  |  | As of December 31, 2017
| Contractual Maturity (in years) | Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Market Value
Mutual funds | --- |  | $ | 68,776,165 |  |  | $ | 42,097 |  |  | $ | (252,373 | ) |  | $ | 68,565,889 |
US corporate debt securities | Less than 2 |  | 35,210,121 |  |  | 3,032 |  |  | (140,198 | ) |  | 35,072,955 |
Investment in affiliated entity (PLS) | --- |  | — |  |  | 2,325,079 |  |  | — |  |  | 2,325,079 |
Total investments |  |  | $ | 103,986,286 |  |  | $ | 2,370,208 |  |  | $ | (392,571 | ) |  | $ | 105,963,923 |

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