14. Share-based Compensation Expenses

The Company's 2008 Incentive Compensation Plan (the “2008 Plan”) allows the plan administrator to grant options and restricted shares to the Company's employees, directors, and consultants, up to a maximum of 11,500,000 ordinary shares. In December 2012, the Board of Directors approved an increase in the number of shares available for issuance under the plan to 18,375,140 ordinary shares. In April 2014 the Company adopted the 2014 Share Incentive Plan (the “2014 Plan”). The maximum aggregate number of shares which may be issued pursuant to all awards under the 2014 Plan was initially 5,500,000 ordinary shares as of the date of its approval. The number of shares reserved for future issuances under the 2014 Plan will be increased automatically if and whenever the ordinary shares reserved under the 2014 Plan account for less than 1% of the total then-issued and outstanding ordinary shares on an as-converted basis, as a result of which increase the ordinary shares reserved under the 2014 Plan immediately after each such increase shall equal 5% of the then-issued and outstanding ordinary shares on an as-converted basis.

The options granted under the 2008 plan have a contractual term of six years, and ones under 2014 plan have a contractual term of ten years. The incentive awards under both 2008 plan and 2014 plan vest over a period of four years of continuous service, one fourth (1/4) of which vest upon the first anniversary of the stated vesting commencement date and the remaining vest ratably over the following 36 months. Under the 2008 plan, incentive awards are only exercisable upon occurrence of certain defined exercisable events. The Group did not recognize any share-based compensation expense for the awards granted until the completion of the Company's IPO on May 9, 2014 upon which the performance condition was satisfied. Share-based compensation expense of RMB39,173 and RMB65,143 was recognized for the years ended December 31, 2014 and 2015, respectively.

Share options

The following table summarizes the Company's option activities:

	Number of options		Weighted Average Exercise Price	Weighted Average Remaining Contractual Life	Aggregate Intrinsic Value
			US$	In Years	US$'000

Outstanding at January 1, 2015	21,265,846		1.17	4.88	60,165
Granted	14,369,000		4.78
Exercised	(4,732,482	)	0.51
Forfeited	(820,553	)	3.21
Outstanding at December 31, 2015	30,081,811		2.94	7.01	71,711
Vested and expected to vest at December 31, 2015	28,908,784		2.90	6.95	70,063
Exercisable at December 31, 2015	9,537,339		0.83	3.77	42,853

The total intrinsic value of options exercised for the years ended December 31, 2014 and 2015 were RMB68,094 and RMB150,325 (US$23,206), respectively. No options were exercised for the year ended December 31, 2013.

The weighted-average grant date fair value for options granted during the years ended December 31, 2013, 2014 and 2015 was US$0.90, US$3.57 and US$2.40, respectively, computed using the binomial option pricing model.

The total fair value of share options vested during the years ended December 31, 2013, 2014, and 2015 was RMB8,341, RMB23,849, and RMB50,089 (US$7,732), respectively.

The Company estimated the expected volatility at the date of grant date and each option valuation date based on the annualized standard deviation of the daily return embedded in historical share prices of comparable companies. Risk free interest rate was estimated based on the yield to maturity of US treasury bonds denominated in US$ at the option valuation date. The exercise multiple is estimated as the ratio of fair value of underlying shares over the exercise price as at the time the option is exercised, based on a consideration of research study regarding exercise pattern based on empirical studies on the actual exercise behavior of employees. The Company has never declared or paid any cash dividends on its capital stock, and the Company does not anticipate any dividend payments on its ordinary shares in the foreseeable future. Expected term is the contract life of the option, and estimated forfeiture rates are determined based on historical employee turnover rate.

The grant date fair value of each option is calculated using a binomial option pricing model with the following assumptions:

	2013			2014			2015

Expected volatility		50-52	%		50%- 51.1	%		50.9%- 51.7	%
Risk-free interest rate		1.08-1.75	%		1.99-2.6	%		2.09%- 2.24	%
Exercise multiple		2.2-2.8			2.2-2.8			2.2-2.8
Expected dividend yield		0	%		0	%		0	%
Expected term (in years)		6			6-10			10
Expected forfeiture rate (post-vesting)		0-20	%		0-20	%		0-20	%
Fair value of the common share on the date of option grant		US$0.91-1.98 RMB5.63-12.26			US$3.33-6.98 RMB20.66-43.31			US$4.21-5.26 RMB27.27-34.07

On May 15, 2014, the Company modified the exercise price of 576,000 share options granted on April 1, 2014 from US$5.00 to US$3.00. The incremental compensation expense of RMB1,698 (US$276) was equal to the excess of the fair value of the modified award immediately after the modification over the fair value of the original award immediately before the modification. The incremental compensation expense will be recognized over the remaining service period.

On December 8, 2014, the Company extended the contract life of 2,159,812 share options granted under 2008 plan from six years to ten years. The incremental compensation expense was immaterial and was recognized immediately since the options were fully vested.

As of December 31, 2015, there was RMB301,518(US$46,546) in total unrecognized compensation expense related to unvested options, which is expected to be recognized over a weighted-average period of 3.15 years.

Restricted shares

The total intrinsic value of restricted shares vested for the years ended December 31, 2014 and 2015 were RMB1,011 and RMB1,694 (US$261), respectively.

The fair value of restricted shares with service conditions or performance conditions is based on the fair market value of the underlying ordinary shares on the date of grant.

The following table summarizes the Company's restricted shares activity under the option plans:

	Numbers of restricted shares		Weighted average grant date fair value

Outstanding as of January 1, 2015	179,382		3.36
Grant	100,914		4.82
Vested	(52,488	)	3.36
Forfeited	—		—
Outstanding as of December 31, 2015	227,808		4.00
Vested and expected to vest at December 31, 2015	227,808		4.00

As of December 31, 2015, there was RMB5,723 (US$883) in total unrecognized compensation expense related to restricted shares, which is expected to be recognized over a weighted-average period of 3.15 years.