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Stock compensation - Option activity (Details) - Stock Options - $ / shares | 1 Months Ended | 6 Months Ended
--- | --- | ---
Jul. 31, 2016 | Jun. 30, 2018 | Jun. 30, 2016
Shares Available For Grant |  |  |
Outstanding at the beginning of the period (in shares) |  | 3,909,701 |
Additional authorization (in shares) |  | 5,000,000 |
Options granted (in shares) |  | (1,565,286) |
Options cancelled (in shares) |  | 244,146 |
Outstanding at the end of the period (in shares) |  | 7,588,561 |
Shares Subject to Outstanding Options, Shares |  |  |
Outstanding at the beginning of the period (in shares) |  | 11,206,553 |
Options granted (in shares) |  | 1,565,286 |
Options exercised (in shares) |  | (844,619) |
Options cancelled (in shares) |  | (244,146) |
Outstanding at the end of the period (in shares) |  | 11,683,074 |
Shares Subject to Outstanding Options, Weighted Average Exercise Price |  |  |
Outstanding at the beginning of the period (in dollars per share) |  | $ 68.36 |
Options granted (in dollars per share) |  | 89.67 |
Options exercised (in dollars per share) |  | 22.03 |
Options cancelled (in dollars per share) |  | 100.67 |
Outstanding at the end of the period (in dollars per share) |  | $ 73.89 |
Termination period | 10 years |  | 7 years
Vesting period | 4 years |  | 3 years
Vesting after one year |  |  |
Shares Subject to Outstanding Options, Weighted Average Exercise Price |  |  |
Vesting period | 1 year |  | 1 year
Vesting Percentage | 25.00% |  | 33.00%
Remainder vesting |  |  |
Shares Subject to Outstanding Options, Weighted Average Exercise Price |  |  |
Vesting period | 36 months |  | 24 months

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- Definition The number of shares added to the total shares available for grant under the share-based compensation plans during the period. + References No definition available. + Details
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- Definition The number of shares under options that were cancelled out of shares available for grant during the reporting period as a result of the occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan. + References No definition available. + Details
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- Definition Number of share options (or share units) granted out of shares available for grant, during the period. + 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 The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + 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 + Details
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- Definition The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan. + 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 (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Net number of share options (or share units) granted during the period. + 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 (c)(1)(iv)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + 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 + Details
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. + 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 (c)(1)(i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which option holders acquired shares when converting their stock options into shares. + References No definition available. + Details
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- Definition Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated. + References No definition available. + Details
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- Definition Percentage of vesting of share-based compensation awards. + 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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