XML 35 R25.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Investments (Tables) | 3 Months Ended
--- | ---
Mar. 31, 2018
Investments, Debt and Equity Securities [Abstract] |
Summary of investments | The following is a summary of available-for-sale securities as of March 31, 2018 and December 31, 2017:
|  |  | As of March 31, 2018
| Contractual Maturity (in years) | Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Market Value
Mutual funds | --- |  | $ | 54,509,756 |  |  | $ | — |  |  | $ | (306,308 | ) |  | $ | 54,203,448 |
US corporate debt securities | Less than 2 |  | 21,211,005 |  |  | — |  |  | (154,564 | ) |  | 21,056,441 |
Investment in affiliated entity (PLS) | --- |  | — |  |  | 3,307,192 |  |  | — |  |  | 3,307,192 |
Total investments |  |  | $ | 75,720,761 |  |  | $ | 3,307,192 |  |  | $ | (460,872 | ) |  | $ | 78,567,081 |
|  |  | 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