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v3.19.2

Investments (Tables) | 6 Months Ended
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Jun. 30, 2019
Investments |
Summary of available-for-sale securities |
|  |  | June 30, 2019
|  |  |  |  | Gross |  | Gross |  |  |
|  |  |  |  | Unrealized |  | Unrealized |  | Fair
|  | Cost |  | Gains |  | Losses |  | Value
Corporate bonds: |  |  |  |  |  |  |  |  |  |  |  |
U.S. corporations |  | $ | 4,433,867 |  | $ | 20,611 |  | $ | 1,348 |  | $ | 4,453,130
International corporations |  |  | 918,417 |  |  | 11,314 |  |  | — |  |  | 929,731
Total |  | $ | 5,352,284 |  | $ | 31,925 |  | $ | 1,348 |  | $ | 5,382,861
|  |  | December 31, 2018
|  |  |  |  | Gross |  | Gross |  |  |
|  |  |  |  | Unrealized |  | Unrealized |  | Fair
|  | Cost |  | Gains |  | Losses |  | Value
Corporate bonds: |  |  |  |  |  |  |  |  |  |  |  |
U.S. corporations |  | $ | 5,487,645 |  | $ | — |  | $ | 58,309 |  | $ | 5,429,336
International corporations |  |  | 918,417 |  |  | 2,162 |  |  | — |  |  | 920,579
Total |  | $ | 6,406,062 |  | $ | 2,162 |  | $ | 58,309 |  | $ | 6,349,915

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- Definition Tabular disclosure of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI http://asc.fasb.org/topic&trid=2196928 + Details
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