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Share-based payments (Tables)

12 Months Ended

Dec. 31, 2012

Schedule of Stock Options Activity

Details of stock options activity during the years ended December 31, 2010, 2011 and 2012 were as follows:

		Number of options				Weighted average exercise price per share				Weighted average remaining contractual term				Aggregate fair value
Balance as of January 1, 2010			423,797				3.19								1,253
Granted			770,000				5.47								1,924
Exercised			(86,673	)			0.01								(345	)
Forfeited			(102,263	)			2.69								(316	)
Balance as of December 31, 2010			1,004,861				2.13								1,253
Granted			120,000				1.74								123
Exercised			(77,387	)			0.01								(307	)
Forfeited			(28,141	)			3.81								(78	)
Balance as of December 31, 2011			1,019,333				5.32				8.0 years				1,880
Granted			1,300,000				1.37								799
Forfeited			(683,810	)			4.04								(968	)
Balance as of December 31, 2012			1,635,523				2.36				8.6 years				1,735
Options exercisable at December 31, 2012			387,188				5.47				6.8 years				738

Schedule of Estimated Grant Date Fair Value of Share Options, Using Binomial Tree Option Pricing Model

The Company determined the estimated grant-date fair value of share options based on the Binomial Tree option-pricing model using the following assumptions:

		2010		2011		2012
Risk-free rate of return		2.74%-4.14%		2.35%		1.46%-2.30%
Weighted average expected option life		10 years		10 years		10 years
Expected volatility rate		64.00%		102.20%		96.90%-102.00%
Dividend yield		0 %		0 %		0%

Schedule of Restricted Share Activity

Details of restricted share activity during the years ended December 31, 2010, 2011 and 2012 were as follows:

		Number of restricted  share Granted				Grant-date fair value				Weighted average remaining contractual term
Balance as of January 1, 2010			463,779
Granted			100,000				605
Exercised			(5,910	)
Forfeitures			(204,604	)
Balance as of December 31, 2010			353,265
Granted			—				—
Exercised			(1,069	)
Forfeitures			(4,334	)
Balance as of December 31, 2011			347,862								7.6 years
Granted			181,087				224
Exercised			(56,087	)
Forfeitures			(327,601	)
Balance as of December 31, 2012			145,261				200				9.45 years
Units vested as of December 31, 2012			16,209				55				6.8 years

X

- 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=6415400&loc=d3e5070-113901

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X

- Definition

Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired 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=6415400&loc=d3e5070-113901

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X

- Definition

Tabular disclosure of the significant assumptions used during the year to estimate the fair value of employee stock purchase plans, including, but not limited to: (a) expected term, (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=6415400&loc=d3e5070-113901

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