Share Transactions - Three-for-one common share split (Details) shares in Millions	Jun. 18, 2018 $ / shares shares	Jun. 30, 2018 $ / shares	Mar. 31, 2018 $ / shares shares	Dec. 31, 2017 $ / shares
Stockholders' Equity Note [Abstract]
Share split conversion ratio	3
Number of common shares authorized \| shares	1,800		600
Common shares, par value per share \| $ / shares	$ 0.0011	$ 0.0011	$ 0.0033	$ 0.0011

Face amount or stated value per share of common stock.

Reference 1: 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(29))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

The maximum number of common shares permitted to be issued by an entity's charter and bylaws.

+ References

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- Definition

Ratio applied to the conversion of stock split, for example but not limited to, one share converted to two or two shares converted to one.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 4
-Subparagraph (SAB TOPIC 4.C)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187143-122770

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