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Marketable Securities (Tables) | 3 Months Ended
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Mar. 31, 2019
Investments, Debt and Equity Securities [Abstract] |
Schedule of Marketable Securities [Table Text Block] |
| March 31, 2019 |  | December 31, 2018
| Cost |  | Unrealized Gain (Loss) |  | Fair Value |  | Cost |  | Unrealized Gain (Loss) |  | Fair Value
U.S. government securities | $ | 2 |  |  | $ | — |  |  | $ | 2 |  |  | $ | 2 |  |  | $ | — |  |  | $ | 2 |
Corporate securities | 4 |  |  |  |  |  | 4 |  |  | 4 |  |  |  |  |  | 4 |
Certificates of deposit | 14 |  |  |  |  |  | 14 |  |  | 15 |  |  |  |  |  | 15 |
Total marketable securities | $ | 20 |  |  | $ | — |  |  | $ | 20 |  |  | $ | 21 |  |  | $ | — |  |  | $ | 21 |

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- Definition Tabular disclosure of marketable securities. This may consist of investments in certain debt and equity securities, short-term investments and other assets. + References No definition available. + Details
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