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Stock compensation - Option activity (Details) - Stock Options - $ / shares | 1 Months Ended | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Jul. 31, 2016 | Mar. 31, 2020 | Jun. 30, 2016
Shares Subject to Outstanding Options, Shares |  |  |
Outstanding at the beginning of the period (in shares) |  | 12,632,657 |
Options granted (in shares) |  | 914,834 |
Options exercised (in shares) |  | (688,202) |
Options cancelled (in shares) |  | (180,342) |
Outstanding at the end of the period (in shares) |  | 12,678,947 |
Shares Subject to Outstanding Options, Weighted Average Exercise Price |  |  |
Outstanding at the beginning of the period (in dollars per share) |  | $ 81.42 |
Options granted (in dollars per share) |  | 80.12 |
Options exercised (in dollars per share) |  | 26.83 |
Options cancelled (in dollars per share) |  | 91.57 |
Outstanding at the end of the period (in dollars per share) |  | $ 84.14 |
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 Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=116856206&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://fasb.org/us-gaap/role/ref/legacyRef -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=116856206&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://fasb.org/us-gaap/role/ref/legacyRef -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=116856206&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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=116856206&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://fasb.org/us-gaap/role/ref/legacyRef -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=116856206&loc=d3e5070-113901 + Details
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