Short Term Investments |
6 Months Ended | |||||||||||||||||||
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Jun. 30, 2018 | ||||||||||||||||||||
| Investments, Debt and Equity Securities [Abstract] | ||||||||||||||||||||
| Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block] |
The following table summarizes the available-for-sale investments held as of June 30, 2018. There were no available-for-sale investments in prior periods.
The amortized cost of the available-for-sale investments is adjusted for amortization of premiums and accretion of discounts to maturity. There were no material realized gains or losses recognized on the sale or maturity of available-for-sale investments during the three or six months ended June 30, 2018
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