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Marketable Securities (Tables)

12 Months Ended

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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- References

No definition available.

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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
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-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
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-Section S99
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-Subparagraph (SX 210.9-03.4)
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-Name Accounting Standards Codification
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