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Share-based payments (Tables) | 12 Months Ended
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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 |

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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=6415400&loc=d3e5070-113901 + Details
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- 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 + Details
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- 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 + Details
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