Date the equity-based award was issued, in CCYY-MM-DD format.

No definition available.

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- Definition

Refers to the number of equal monthly installments awarded options will vest.

+ References

No definition available.

+ Details

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- Definition

Date the equity-based award becomes 25% vested and an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in CCYY-MM-DD format.

+ References

No definition available.

+ Details

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- References

No definition available.

+ Details

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- Definition

Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

+ Details

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- Definition

Gross number of share options (or share units) granted during the period.

+ References

No definition available.

+ Details

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- Definition

Percentage of vesting of share-based compensation awards.

+ References

+ Details

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- Details

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Stock Options, Non-qualified Options (Details)					12 Months Ended
Stock Options, Non-qualified Options (Details)	Nov. 01, 2017 shares	Mar. 01, 2017 shares	Nov. 01, 2016 shares	Nov. 16, 2015 shares	Dec. 31, 2017 Installment shares	Dec. 31, 2016 shares	Dec. 31, 2015 shares
Qualified and Nonqualified Stock Options [Member]
Stock Options [Abstract]
Number of options (in shares)					1,365,400	1,211,400	1,902,609
Nonqualified Stock Options [Member] \| Executives [Member]
Stock Options [Abstract]
Vesting period					4 years
Nonqualified Stock Options [Member] \| Executives [Member] \| Vesting One Year Following Date of Hire [Member]
Stock Options [Abstract]
Vesting percentage					25.00%
Nonqualified Stock Options [Member] \| Executives [Member] \| Vesting in 36 Monthly Installments Thereafter [Member]
Stock Options [Abstract]
Vesting percentage					75.00%
Number of monthly installments for vesting \| Installment					36
Nonqualified Stock Options [Member] \| SVP, General Counsel and Secretary [Member]
Stock Options [Abstract]
Issue date					Nov. 16, 2015
25% vesting date					Oct. 30, 2016
Number of options (in shares)				80,000
Nonqualified Stock Options [Member] \| Chief Operating Officer [Member]
Stock Options [Abstract]
Issue date					Nov. 01, 2016
25% vesting date					Oct. 17, 2017
Number of options (in shares)			150,000
Nonqualified Stock Options [Member] \| SVP, Regulatory Affairs [Member]
Stock Options [Abstract]
Issue date					Mar. 01, 2017
25% vesting date					Feb. 28, 2018
Number of options (in shares)		80,000
Nonqualified Stock Options [Member] \| Chief Financial Officer [Member]
Stock Options [Abstract]
Issue date					Nov. 01, 2017
25% vesting date					Oct. 31, 2018
Number of options (in shares)	200,000