The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

+ 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)(3)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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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

Number of options outstanding, including both vested and non-vested options.

+ References

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

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

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- Definition

Under the fixed increase alternative, represents the potential annual increase in shares of common stock reserved for issuance as share-based compensation.

+ References

No definition available.

+ Details

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- Definition

Under the automatic percentage increase alternative, represents the potential annual increase in common stock reserved for issuance as share-based compensation, expressed as a percentage of common stock outstanding at the beginning of each fiscal year.

+ References

No definition available.

+ Details

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Stock incentive plans - Plans (Details) - shares	12 Months Ended	48 Months Ended	82 Months Ended
Stock incentive plans - Plans (Details) - shares	Dec. 31, 2017	Dec. 31, 2017	Dec. 31, 2017	Dec. 31, 2016
Stock options
Stock incentive plans
Number of stock options granted		0
Number of options outstanding	1,283,000	1,283,000	1,283,000	3,084,000
RSUs
Stock incentive plans
Number of RSUs granted (in shares)	617,000
2011 Plan
Stock incentive plans
Common stock shares reserved for issuance	13,739,820	13,739,820	13,739,820
Annual percentage increase alternative, increase in common stock reserved for issuance as a percentage of common stock outstanding	4.50%
Annual fixed increase alternative, increase in shares of common stock reserved for issuance (in shares)	3,000,000
Number of options outstanding	1,128,000	1,128,000	1,128,000	1,994,000
2011 Plan \| Stock options
Stock incentive plans
Number of stock options granted			5,229,486
2011 Plan \| RSUs
Stock incentive plans
Number of RSUs granted (in shares)			7,713,459
2001 Plan
Stock incentive plans
Number of options outstanding	155,000	155,000	155,000	1,090,000
2001 Plan \| Stock options
Stock incentive plans
Number of options outstanding	154,699	154,699	154,699