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Share-based compensation (Tables) | 12 Months Ended
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Dec. 31, 2017
Founder |
Share-based compensation |
Schedule of assumptions used to calculate estimated fair value of each option grant |
|  | 2015 |
Expected volatility |  | 36%~38% |
Risk-free interest rate (per annum) |  | 2.74%~2.79% |
Exercise multiples |  | 2.0 |
Expected dividend yield |  | — |
Expected term (in years) |  | 10.0 |
Fair value of the underlying shares on the date of option grants (US$) |  | 16.70~16.93 |
Vesting Based On Service | Employee and non-employee |
Share-based compensation |
Schedule of RSUs activity |
|  | Number of RSUs |  | Weighted-Average Grant-Date Fair Value |
Unvested at January 1, 2015 |  | 32,118,491 |  | 5.80 |
Granted |  | 18,595,642 |  | 14.35 |
Vested |  | (7,368,335 | ) | 5.05 |
Forfeited |  | (3,934,276 | ) | 9.73 |
Unvested at December 31, 2015 |  | 39,411,522 |  | 9.58 |
Granted |  | 59,254,734 |  | 12.82 |
Vested |  | (8,692,792 | ) | 7.98 |
Forfeited |  | (7,125,648 | ) | 10.66 |
Unvested at December 31, 2016 |  | 82,847,816 |  | 11.97 |
Granted |  | 41,450,212 |  | 16.27 |
Vested |  | (12,005,700 | ) | 10.14 |
Forfeited |  | (6,246,436 | ) | 13.42 |
Unvested at December 31, 2017 |  | 106,045,892 |  | 13.77 |
Schedule of service-based share options activity |
Share options |  | Number of share options |  | Weighted Average Exercise Price |  | Weighted Average Remaining Contractual Term |  | Aggregate Intrinsic Value |
|  |  |  | US$ |  | Year |  | US$ |
Outstanding as of January 1, 2015 |  | 26,201,252 |  | 4.37 |  | 8.5 |  | 189,729 |
Granted |  | 5,652,500 |  | 13.17 |  |  |  |  |
Exercised |  | (2,694,404 | ) | 4.07 |  |  |  |  |
Forfeited or cancelled |  | (1,724,726 | ) | 6.07 |  |  |  |  |
Expired |  | — |  |  |  |  |  |  |
Outstanding as of December 31, 2015 |  | 27,434,622 |  | 6.10 |  | 8.1 |  | 275,040 |
Granted |  | — |  |  |  |  |  |  |
Exercised |  | (2,820,648 | ) | 3.97 |  |  |  |  |
Forfeited or cancelled |  | (2,954,958 | ) | 7.21 |  |  |  |  |
Expired |  | — |  |  |  |  |  |  |
Outstanding as of December 31, 2016 |  | 21,659,016 |  | 6.23 |  | 7.3 |  | 142,433 |
Granted |  | — |  |  |  |  |  |  |
Exercised |  | (4,116,816 | ) | 5.20 |  |  |  |  |
Forfeited or cancelled |  | (432,092 | ) | 5.92 |  |  |  |  |
Expired |  | — |  |  |  |  |  |  |
Outstanding as of December 31, 2017 |  | 17,110,108 |  | 6.49 |  | 6.2 |  | 243,327 |
Vested and expected to vest as of December 31, 2017 |  | 16,110,208 |  | 6.41 |  | 6.2 |  | 230,350 |
Exercisable as of December 31, 2017 |  | 8,777,612 |  | 5.31 |  | 5.9 |  | 135,192 |
Schedule of assumptions used to calculate estimated fair value of each option grant |
|  | 2015 |
Expected volatility |  | 33%~50% |
Risk-free interest rate (per annum) |  | 2.17%~2.65% |
Exercise multiples |  | 2.0~2.8 |
Expected dividend yield |  | — |
Expected term (in years) |  | 10.0 |
Fair value of the underlying shares on the date of option grants (US$) |  | 11.57~14.69 |
Vesting Based On Performance | Employee and non-employee |
Share-based compensation |
Schedule of RSUs activity |
|  | Number of RSUs |  | Weighted-Average Grant-Date Fair Value |
Unvested at January 1, 2015 |  | 1,466,658 |  | 6.33 |
Granted |  | — |  | — |
Vested |  | (188,936 | ) | 6.33 |
Forfeited |  | (401,358 | ) | 6.33 |
Unvested at December 31, 2015 |  | 876,364 |  | 6.33 |
Granted |  | — |  | — |
Vested |  | (118,540 | ) | 6.33 |
Forfeited |  | (447,822 | ) | 6.33 |
Unvested at December 31, 2016 |  | 310,002 |  | 6.33 |
Granted |  | — |  | — |
Vested |  | (96,516 | ) | 6.33 |
Forfeited |  | — |  | — |
Unvested at December 31, 2017 |  | 213,486 |  | 6.33 |

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- Definition Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year. + 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) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + 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 (d) -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 (e) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + 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 (f)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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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. + Details
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