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Share-based Compensation (Share option activities) (Details) $ / shares in Units, $ in Millions | 12 Months Ended
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Dec. 31, 2016 USD ($) years $ / shares shares | Dec. 31, 2015 USD ($) years $ / shares shares | Dec. 31, 2014 USD ($) years $ / shares shares
Number of Options |  |  |
Number of Options, Outstanding, Beginning Balance | shares | 46,117,530 | 50,267,007 | 39,770,121
Number of Options, Granted | shares | 9,991,964 | 8,020,000 | 21,052,758
Number of Options, Forfeited and expired | shares | (10,005,413) | (8,379,197) | (4,013,850)
Number of Options, Exercised | shares | (1,658,946) | (3,790,280) | (6,542,022)
Number of Options, Outstanding, Ending Balance | shares | 44,445,135 | 46,117,530 | 50,267,007
Number of Options, Exercisable | shares | 12,802,895 |  |
Number of Options, Vested and expected to vest | shares | 30,349,765 |  |
Weighted Average Exercise Price |  |  |
Weighted Average Exercise Price, Outstanding, Beginning Balance | $ / shares | $ 0.81 | $ 0.79 | $ 0.44
Weighted Average Exercise Price, Granted | $ / shares | 0.47 | 0.92 | 1.30
Weighted Average Exercise Price, Forfeited and expired | $ / shares | 0.94 | 1.03 | 0.91
Weighted Average Exercise Price, Exercised | $ / shares | 0.22 | 0.36 | 0.23
Weighted Average Exercise Price, Outstanding, Ending Balance | $ / shares | 0.43 | $ 0.81 | $ 0.79
Weighted Average Exercise Price, Exercisable | $ / shares | 0.29 |  |
Weighted Average Exercise Price, Vested and expected to vest | $ / shares | $ 0.40 |  |
Weighted Average Remaining Contractual Life |  |  |
Weighted Average Remaining Contractual Life, Outstanding, Beginning Balance | years | 7.5 | 8.2 | 8.1
Weighted Average Remaining Contractual Life, Outstanding, Ending Balance | years | 7.1 | 7.5 | 8.2
Weighted Average Remaining Contractual Life, Exercisable | years | 4.4 |  |
Weighted Average Remaining Contractual Life, Vested and expected to vest | years | 6.5 |  |
Aggregate Intrinsic Value |  |  |
Aggregate Intrinsic Value, Outstanding, Beginning Balance | $ | $ 7.6 | $ 17.6 | $ 30.2
Aggregate Intrinsic Value, Exercised | $ | 0.4 | 1.5 | 7.1
Aggregate Intrinsic Value, Outstanding, Ending Balance | $ | 1.8 | $ 7.6 | $ 17.6
Aggregate Intrinsic Value, Exercisable | $ | 1.8 |  |
Aggregate Intrinsic Value, Vested and expected to vest | $ | $ 1.8 |  |

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- Definition Share-based Compensation Arrangement by Share-based Payment Award, Options, Number of Options [Abstract] + References No definition available. + Details
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- Definition Weighted average remaining contractual term for option awards exercisable. + References No definition available. + Details
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- Definition Weighted average remaining contractual term for option awards outstanding. + References No definition available. + Details
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- Definition Weighted average remaining contractual term for option awards vested and expected to vest. + References No definition available. + Details
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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the 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)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable 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)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares. + 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 (d)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired. + 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)(iv)(3)-(4) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average price of options that were either forfeited or expired. + 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)(iv)(3)-(4) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Gross number of share options (or share units) granted during the period. + References No definition available. + Details
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- Definition Amount by which the current fair value of the underlying stock exceeds the exercise price of 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 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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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 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 Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options. + References No definition available. + Details
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