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Marketable Securities (Tables) | 12 Months Ended
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Dec. 31, 2017
Investments, Debt and Equity Securities [Abstract] |
Changes in Value of Marketable Securities Reported in Current Assets on Consolidated Balance Sheets | Changes in the value of marketable securities, as reported in current assets on the consolidated balance sheets as at December 31, 2017 and December 31, 2016 are detailed in the tables below:
|  | December 31, 2016 |  |  | Purchase |  |  | Sale |  |  | Change in fair value included in OCI* |  |  | Change in fair value recognized in earnings |  |  | December 31, 2017 |
U.S. Treasury debt securities |  |  | 335 |  |  |  | 99 |  |  |  | — |  |  |  | (3 | ) |  |  | — |  |  |  | 431 |
Total |  |  | 335 |  |  |  | 99 |  |  |  | — |  |  |  | (3 | ) |  |  | — |  |  |  | 431 |
* | Other Comprehensive Income
|  | December 31, 2015 |  |  | Purchase |  |  | Sale |  |  | Change in fair value included in OCI* |  |  | Change in fair value recognized in earnings |  |  | December 31, 2016 |
U.S. Treasury debt securities |  |  | 335 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 335 |
Total |  |  | 335 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 335 |
* | Other Comprehensive Income

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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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26626-111562 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.4) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26610-111562 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2,12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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