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Share based compensation (Summary of Activities of Pre-2009 Scheme Options for Employees and Non-employee) (Details) - Share options [Member] - Pre-2009 Scheme Options [Member] - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Number of options |  |  |  |
Outstanding at the beginning of the period (in shares) | 7,380,345 | 13,222,005 | 17,870,425 |
Exercised/Repurchased (in shares) | (6,611,970) | (5,841,660) | (4,648,420) |
Outstanding at the end of the period (in shares) |  | 7,380,345 | 13,222,005 | 17,870,425
Outstanding, vested and exercisable at the end of the period (in shares) | 768,375 |  |  |
Weighted average exercise price |  |  |  |
Outstanding at the beginning of the period (in dollars per share) | $ 0.0061 | $ 0.0059 | $ 0.0055 |
Exercised/Repurchased (in dollars per share) | 0.0061 | 0.0057 | 0.0045 |
Outstanding at the end of the period (in dollars per share) |  | $ 0.0061 | $ 0.0059 | $ 0.0055
Outstanding, vested and exercisable at the end of the period (in dollars per share) | $ 0.0067 |  |  |
Weighted average remaining contractual life |  |  |  |
Outstanding at the end of the period |  |  | 4 years 4 months 24 days | 5 years 4 months 13 days
Exercised | 2 years 5 months 16 days | 3 years 2 months 26 days | 4 years 3 months 18 days |
Outstanding, vested and exercisable at the end of the period | 2 years 11 months 26 days | 3 years 6 months 7 days |  |
Aggregate intrinsic value |  |  |  |
Outstanding at the end of the period |  |  | $ 33,162 | $ 12,642
Outstanding, vested and exercisable at the end of the period | $ 2,395 | $ 22,959 |  |

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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&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 (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. + 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)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of fully vested and expected to vest options that are exercisable. + 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 (e)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of exercisable share options (fully vested and expected to vest) that may be converted as of the balance sheet date. + 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 (e)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition As of the balance sheet date, the weighted-average exercise price (at which grantees can acquire the shares reserved for issuance) for exercisable stock options that are fully vested or expected to vest. + 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 (e)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Amount by which the current fair value of the underlying stock exceeds the exercise price of fully vested and expected to vest options outstanding. + 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 (e) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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 (e)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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