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Investments

6 Months Ended

Jun. 30, 2019

Investments

Investments

7 — Investments

Our investments consist of corporate bonds that we have classified as available-for-sale and are summarized in the following tables:

			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

Unrealized losses from the above investments for all periods presented are attributable to changes in interest rates. We do not believe any of these unrealized losses represent other-than-temporary impairments based on our evaluation of available evidence as of June 30, 2019.

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The entire disclosure for investments in certain debt and equity securities.

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