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Share-based compensation (Details 2) $ / shares in Units, ¥ in Thousands, $ in Thousands | 12 Months Ended |
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Dec. 31, 2018 USD ($) $ / shares shares | Dec. 31, 2018 CNY (¥) shares | Dec. 31, 2017 USD ($) $ / shares shares | Dec. 31, 2017 CNY (¥) shares | Dec. 31, 2016 USD ($) $ / shares shares | Dec. 31, 2016 CNY (¥) shares | Dec. 31, 2015 USD ($) $ / shares shares | Dec. 31, 2018 CNY (¥) shares
Additional disclosures |  |  |  |  |  |  |  |
Share-based compensation expenses | ¥ |  | ¥ 3,659,989 |  | ¥ 2,780,062 |  | ¥ 2,061,432 |  |
Share Incentive Plan |  |  |  |  |  |  |  |
Share-based compensation |  |  |  |  |  |  |  |
Number of ordinary shares available for future grants | 112,823,383 |  |  |  |  |  |  | 112,823,383
Share Incentive Plan | Employee and non-employee |  |  |  |  |  |  |  |
Share-based compensation |  |  |  |  |  |  |  |
Term of vesting schedule period | 6 years | 6 years |  |  |  |  |  |
Share Incentive Plan | Employee and non-employee | Unvested RSUs | Service-based |  |  |  |  |  |  |  |
Number of Shares |  |  |  |  |  |  |  |
Unvested at the beginning of the year (in shares) | 106,045,892 | 106,045,892 | 82,847,816 | 82,847,816 | 39,411,522 | 39,411,522 |  |
Granted (in shares) | 40,383,436 | 40,383,436 | 41,450,212 | 41,450,212 | 59,254,734 | 59,254,734 |  |
Vested (in shares) | (16,137,554) | (16,137,554) | (12,005,700) | (12,005,700) | (8,692,792) | (8,692,792) |  |
Forfeited (in shares) | (11,795,682) | (11,795,682) | (6,246,436) | (6,246,436) | (7,125,648) | (7,125,648) |  |
Unvested at the end of the year (in shares) | 118,496,092 | 118,496,092 | 106,045,892 | 106,045,892 | 82,847,816 | 82,847,816 | 39,411,522 |
Weighted-Average Grant-Date Fair Value |  |  |  |  |  |  |  |
Unvested at the beginning of the year (in dollars per share) | $ / shares | $ 13.77 |  | $ 11.97 |  | $ 9.58 |  |  |
Granted (in dollars per share) | $ / shares | 18.95 |  | 16.27 |  | 12.82 |  |  |
Vested (in dollars per share) | $ / shares | 12.47 |  | 10.14 |  | 7.98 |  |  |
Forfeited (in dollars per share) | $ / shares | 15.16 |  | 13.42 |  | 10.66 |  |  |
Unvested at the end of the year (in dollars per share) | $ / shares | $ 15.58 |  | $ 13.77 |  | $ 11.97 |  | $ 9.58 |
Additional disclosures |  |  |  |  |  |  |  |
Share-based compensation expenses | ¥ |  | ¥ 2,968,468 |  | ¥ 2,462,881 |  | ¥ 1,613,204 |  |
Unrecognized share-based compensation expense related to awards other than options | ¥ |  |  |  |  |  |  |  | ¥ 7,187,657
Weighted-average period over which share-based compensation expense is expected to be recognized | 5 years 2 months 12 days | 5 years 2 months 12 days |  |  |  |  |  |
Total fair value of RSUs vested | $ | $ 295,632 |  | $ 213,155 |  | $ 111,956 |  |  |
Total intrinsic value of RSUs vested | $ | $ 295,632 |  | $ 213,155 |  | $ 111,956 |  |  |
Share Incentive Plan | Employee and non-employee | Unvested RSUs | Performance-based |  |  |  |  |  |  |  |
Number of Shares |  |  |  |  |  |  |  |
Unvested at the beginning of the year (in shares) | 213,486 | 213,486 | 310,002 | 310,002 | 876,364 | 876,364 |  |
Vested (in shares) | (103,788) | (103,788) | (96,516) | (96,516) | (118,540) | (118,540) |  |
Forfeited (in shares) | (30,152) | (30,152) |  |  | (447,822) | (447,822) |  |
Unvested at the end of the year (in shares) | 79,546 | 79,546 | 213,486 | 213,486 | 310,002 | 310,002 | 876,364 |
Weighted-Average Grant-Date Fair Value |  |  |  |  |  |  |  |
Unvested at the beginning of the year (in dollars per share) | $ / shares | $ 6.33 |  | $ 6.33 |  | $ 6.33 |  |  |
Vested (in dollars per share) | $ / shares | 6.33 |  | 6.33 |  | 6.33 |  |  |
Forfeited (in dollars per share) | $ / shares | 6.33 |  |  |  | 6.33 |  |  |
Unvested at the end of the year (in dollars per share) | $ / shares | $ 6.33 |  | $ 6.33 |  | $ 6.33 |  | $ 6.33 |
Additional disclosures |  |  |  |  |  |  |  |
Share-based compensation expenses | ¥ |  | ¥ 520 |  | ¥ 1,157 |  | ¥ 4,334 |  |
Unrecognized share-based compensation expense related to awards other than options | ¥ |  |  |  |  |  |  |  | ¥ 61
Weighted-average period over which share-based compensation expense is expected to be recognized | 1 month 6 days | 1 month 6 days |  |  |  |  |  |
Total fair value of RSUs vested | $ | $ 2,555 |  | $ 1,371 |  | $ 1,524 |  |  |
Total intrinsic value of RSUs vested | $ | $ 2,555 |  | $ 1,371 |  | $ 1,524 |  |  |
Share Incentive Plan | Employee and non-employee | Options | Service-based |  |  |  |  |  |  |  |
Number of share options |  |  |  |  |  |  |  |
Outstanding at the beginning of the year (in shares) | 17,110,108 | 17,110,108 | 21,659,016 | 21,659,016 | 27,434,622 | 27,434,622 |  |
Granted (in shares) | 0 | 0 | 0 | 0 | 0 | 0 |  |
Exercised (in shares) | (1,077,036) | (1,077,036) | (4,116,816) | (4,116,816) | (2,820,648) | (2,820,648) |  |
Forfeited or cancelled (in shares) | (285,336) | (285,336) | (432,092) | (432,092) | (2,954,958) | (2,954,958) |  |
Outstanding at the end of the year (in shares) | 15,747,736 | 15,747,736 | 17,110,108 | 17,110,108 | 21,659,016 | 21,659,016 | 27,434,622 |
Vested and expected to vest at the end of the year (in shares) | 15,130,922 |  |  |  |  |  |  | 15,130,922
Exercisable at the end of the year (in shares) | 11,003,010 |  |  |  |  |  |  | 11,003,010
Weighted Average Exercise Price |  |  |  |  |  |  |  |
Outstanding at the beginning of the year (in dollars per share) | $ / shares | $ 6.49 |  | $ 6.23 |  | $ 6.10 |  |  |
Exercised (in dollars per share) | $ / shares | 5.23 |  | 5.20 |  | 3.97 |  |  |
Forfeited or cancelled (in dollars per share) | $ / shares | 7.68 |  | 5.92 |  | 7.21 |  |  |
Outstanding at the end of the year (in dollars per share) | $ / shares | 6.55 |  | $ 6.49 |  | $ 6.23 |  | $ 6.10 |
Vested and expected to vest at the end of the year (in dollars per share) | $ / shares | 6.46 |  |  |  |  |  |  |
Exercisable at the end of the year (in dollars per share) | $ / shares | $ 5.57 |  |  |  |  |  |  |
Weighted Average Remaining Contractual Term (years) |  |  |  |  |  |  |  |
Outstanding at the end of the year | 5 years 3 months 18 days | 5 years 3 months 18 days | 6 years 2 months 12 days | 6 years 2 months 12 days | 7 years 3 months 18 days | 7 years 3 months 18 days | 8 years 1 month 6 days |
Vested and expected to vest at the end of the year | 5 years 3 months 18 days | 5 years 3 months 18 days |  |  |  |  |  |
Exercisable at the end of the year | 5 years 1 month 6 days | 5 years 1 month 6 days |  |  |  |  |  |
Aggregate Intrinsic Value |  |  |  |  |  |  |  |
Outstanding at the end of the year (in dollars) | $ | $ 72,658 |  | $ 243,327 |  | $ 142,433 |  | $ 275,040 |
Vested and expected to vest at the end of the year (in dollars) | $ | 70,845 |  |  |  |  |  |  |
Exercisable at the end of the year (in dollars) | $ | $ 58,713 |  |  |  |  |  |  |
Additional disclosures |  |  |  |  |  |  |  |
Share-based compensation expenses | ¥ |  | ¥ 32,558 |  | ¥ 60,739 |  | ¥ 125,225 |  |
Unrecognized share-based compensation expense related to options | ¥ |  |  |  |  |  |  |  | ¥ 38,946
Weighted-average period over which share-based compensation expense is expected to be recognized | 2 years 10 months 24 days | 2 years 10 months 24 days |  |  |  |  |  |
Total intrinsic value of options exercised | $ | $ 15,326 |  | 55,278 |  | 23,796 |  |  |
Cash received from the exercises of share options | $ | 7,382 |  | 19,942 |  | $ 12,454 |  |  |
Cash Receivable From Stock Option Exercises | $ | $ 449 |  | $ 2,201 |  |  |  |  |
Share Incentive Plan | Non-employees | Unvested RSUs | Service-based |  |  |  |  |  |  |  |
Number of Shares |  |  |  |  |  |  |  |
Unvested at the beginning of the year (in shares) | 5,719,884 | 5,719,884 |  |  |  |  |  |
Unvested at the end of the year (in shares) | 5,798,970 | 5,798,970 | 5,719,884 | 5,719,884 |  |  |  |
Share Incentive Plan | Non-employees | Options | Service-based |  |  |  |  |  |  |  |
Number of share options |  |  |  |  |  |  |  |
Outstanding at the beginning of the year (in shares) | 1,379,780 | 1,379,780 |  |  |  |  |  |
Outstanding at the end of the year (in shares) | 1,211,214 | 1,211,214 | 1,379,780 | 1,379,780 |  |  |  |
Share Incentive Plan | Year two | Employee and non-employee |  |  |  |  |  |  |  |
Share-based compensation |  |  |  |  |  |  |  |
Year in which shares are vested | 2 years | 2 years |  |  |  |  |  |
Vesting percentage (as a percent) | 50.00% | 50.00% |  |  |  |  |  |
Share Incentive Plan | Year three | Employee and non-employee |  |  |  |  |  |  |  |
Share-based compensation |  |  |  |  |  |  |  |
Year in which shares are vested | 3 years | 3 years |  |  |  |  |  |
Vesting percentage (as a percent) | 33.00% | 33.00% |  |  |  |  |  |
Share Incentive Plan | Year four | Employee and non-employee |  |  |  |  |  |  |  |
Share-based compensation |  |  |  |  |  |  |  |
Year in which shares are vested | 4 years | 4 years |  |  |  |  |  |
Vesting percentage (as a percent) | 25.00% | 25.00% |  |  |  |  |  |
Share Incentive Plan | Year five | Employee and non-employee |  |  |  |  |  |  |  |
Share-based compensation |  |  |  |  |  |  |  |
Year in which shares are vested | 5 years | 5 years |  |  |  |  |  |
Vesting percentage (as a percent) | 20.00% | 20.00% |  |  |  |  |  |
Share Incentive Plan | Year six | Employee and non-employee |  |  |  |  |  |  |  |
Share-based compensation |  |  |  |  |  |  |  |
Year in which shares are vested | 6 years | 6 years |  |  |  |  |  |
Vesting percentage (as a percent) | 17.00% | 17.00% |  |  |  |  |  |
Share Incentive Plan | Year ten | Employee and non-employee |  |  |  |  |  |  |  |
Share-based compensation |  |  |  |  |  |  |  |
Year in which shares are vested | 10 years | 10 years |  |  |  |  |  |
Vesting percentage (as a percent) | 10.00% | 10.00% |  |  |  |  |  |

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- Definition 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). + 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)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued 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). + 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)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units. + 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)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting 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)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash. + 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 (d)(2) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement. + 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)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=109197908&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://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=109197908&loc=d3e5070-113901 + Details
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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the 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)(iii) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable 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)(iii) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares. + 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 (d)(2) -URI http://asc.fasb.org/extlink&oid=109197908&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=109197908&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 Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding. + 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=109197908&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=109197908&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=109197908&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=109197908&loc=d3e5070-113901 + Details
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- Definition Amount by which current fair value of underlying stock exceeds exercise price of fully vested and expected to vest options outstanding. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur. + 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 (e) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Number of fully vested and expected to vest options outstanding that can be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur. + 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 (e)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Weighted-average exercise price, at which grantee can acquire shares reserved for issuance, for fully vested and expected to vest options outstanding. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur. + 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 (e)(1) -URI http://asc.fasb.org/extlink&oid=109197908&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://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=109197908&loc=d3e5070-113901 + Details
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- Definition Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable. + 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=109197908&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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=109197908&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term for fully vested and expected to vest options outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur. + 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 (e)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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