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Share-based compensation (Tables)

12 Months Ended

Dec. 31, 2019

Share-based Payment Arrangement [Abstract]

Schedule of Stock Option Shares Activities

The following table sets forth the stock option shares activities under all the option plans for the years ended December 31, 2017, 2018 and 2019:

		Options Outstanding				Weighted Average Exercise Price				Weighted Average Remaining Contractual Life				Aggregate Intrinsic Value
						US$								US$
Outstanding at December 31, 2016			112,570,000				0.0650				3.37				22,688
Granted			26,610,000				0.3020				—				—
Canceled/Forfeited			(7,538,200	)			0.0967				—				—
Outstanding at December 31, 2017			131,641,800				0.1108				2.69				172,618
Granted			12,039,050				0.8942				—				—
Canceled/Forfeited			(3,722,285	)			0.1930				—				—
Expired			(300,000	)			0.0040				—				—
Exercised			(44,005,360	)			0.0543				—				—
Outstanding at December 31, 2018			95,653,205				0.2214				2.17				47,689
Granted			19,275,000				0.6540				—				—
Canceled/Forfeited			(6,490,415	)			0.5964				—				—
Exercised			(53,873,360	)			0.0977				—				—
Outstanding at December 31, 2019			54,564,430				0.4519				2.51				4,264
Vested and expected to vest at December 31, 2019			53,286,128				0.4523				2.51				4,143
Exercisable as of December 31, 2019			14,156,930				0.3075				1.54				3,221

Schedule of Fair Value of Each Option Granted Estimated Using Binomial Model Assumption

The fair value of each option granted under the Company’s Incentive Shares plan was estimated on the date of grant using the binomial model that uses the assumption noted in the following table:

		Options Granted in 2017				Options Granted in 2018				Options Granted in 2019
		RMB				RMB				RMB
Risk-free interest rate			1.97%~2.04	%			2.52%-2.75	%			2.62%
Expected life (in years)			5				5				5
Expected dividend yield			0	%			0	%			0%
Expected volatility			39.0%~41.9	%			37.74%-38.74	%			38.01%
Exercise multiple			2.8				2.2-2.8				2.2-2.8

Summary of Restricted Stock Units Activities Under All Incentive Plans

The following table sets forth the Company’s RSUs activities under all incentive plans for the years ended December 31, 2017, 2018 and 2019:

		Number of RSUs				Weighted- average grant date fair value
						US$
Unvested at December 31, 2017			—				—
Granted			7,822,280				1.4375
Vested			—				—
Canceled/Forfeited			(270,800	)			1.3233
Unvested at December 31, 2018			7,551,480				1.4416
Granted			9,406,495				0.7353
Vested			(1,534,570	)			1.4645
Canceled/Forfeited			(3,399,610	)			1.0740
Unvested at December 31, 2019			12,023,795				0.9880

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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.

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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.

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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.

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