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Investment Securities (Tables) | 9 Months Ended
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Sep. 30, 2018
Investments, Debt and Equity Securities [Abstract] |
Available-for-sale Securities [Table Text Block] | Our short and long-term investment securities consisted of the following (in thousands):
| As of September 30, 2018
| Amortized Cost |  | Unrealized Holding Gains (Losses) |  | Fair Value
Short-term corporate bonds | $ | 36,960 |  |  | $ | — |  |  | $ | 36,960 |
Long-term corporate bonds | 2,922 |  |  | — |  |  | 2,922 |
Total investment securities | $ | 39,882 |  |  | $ | — |  |  | $ | 39,882 |
| As of December 31, 2017
| Amortized Cost |  | Unrealized Holding Gains (Losses) |  | Fair Value
Short-term corporate bonds | $ | 10,061 |  |  | $ | — |  |  | $ | 10,061 |
Long-term corporate bonds | 14,579 |  |  | — |  |  | 14,579 |
Total investment securities | $ | 24,640 |  |  | $ | — |  |  | $ | 24,640 |

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- Definition Tabular disclosure of available-for-sale securities which includes, but is not limited to, changes in the cost basis and fair value, fair value and gross unrealized gain (loss), fair values by type of security, contractual maturity and classification, amortized cost basis, contracts to acquire securities to be accounted for as available-for-sale, debt maturities, transfers to trading, change in net unrealized holding gain (loss) net of tax, continuous unrealized loss position fair value, aggregate losses qualitative disclosures, other than temporary impairment (OTTI) losses or other disclosures related to available for sale securities. + References No definition available. + Details
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- References No definition available. + Details
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