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Capital Structure - Summary of Ordinary Shares (Details) - shares	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Equity [Abstract]
Ordinary shares in issue at the beginning of the year	59,474,085	59,774,464
Ordinary shares issued to employees under the 2013 share incentive plan and/or 2008 share purchase plan	229,318.335397318	309,727
Ordinary shares issued to non-employee directors	39,752.6646026832	38,835
Ordinary shares repurchased	0	(648,941)
Ordinary shares in issue at the end of the year	59,743,156	59,474,085

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- Definition

Stock issued during period shares non employee options.

+ References

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- Definition

Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(29))
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- Definition

Number of shares (or other type of equity) issued during the period as a result of any equity-based compensation plan other than an employee stock ownership plan (ESOP), net of any shares forfeited. Shares issued could result from the issuance of restricted stock, the exercise of stock options, stock issued under employee stock purchase plans, and/or other employee benefit plans.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
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- Definition

Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
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