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Stock compensation - Option activity (Details) - Stock Options - $ / shares | 1 Months Ended | 6 Months Ended | 9 Months Ended
--- | --- | --- | ---
Jul. 31, 2016 | Jun. 30, 2016 | Sep. 30, 2019
Shares Subject to Outstanding Options, Shares |  |  |
Outstanding at the beginning of the period (in shares) |  |  | 12,285,159
Options granted (in shares) |  |  | 3,334,747
Options exercised (in shares) |  |  | (1,506,665)
Options cancelled (in shares) |  |  | (671,712)
Outstanding at the end of the period (in shares) |  |  | 13,441,529
Shares Subject to Outstanding Options, Weighted Average Exercise Price |  |  |
Outstanding at the beginning of the period (in dollars per share) |  |  | $ 74.39
Options granted (in dollars per share) |  |  | 76.37
Options exercised (in dollars per share) |  |  | 28.22
Options cancelled (in dollars per share) |  |  | 90.93
Outstanding at the end of the period (in dollars per share) |  |  | $ 79.23
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 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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