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Share-based Compensation - Share option activities (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Number of Options |  |  |  |
Number of Options, Outstanding, Beginning Balance | 34,251,734 | 39,288,939 | 44,445,135 |
Number of Options, Granted | 15,794,018 | 3,719,500 | 7,255,000 |
Number of Options, Forfeited and expired | (7,128,379) | (3,933,599) | (7,319,500) |
Number of Options, Exercised | (174,373) | (4,823,106) | (5,091,696) |
Number of Options, Outstanding, Ending Balance | 42,743,000 | 34,251,734 | 39,288,939 | 44,445,135
Number of Options, Exercisable | 25,806,736 |  |  |
Number of Options, Vested and expected to vest | 33,809,645 |  |  |
Weighted Average Exercise Price |  |  |  |
Weighted Average Exercise Price, Outstanding, Beginning Balance | $ 0.47 | $ 0.42 | $ 0.43 |
Weighted Average Exercise Price, Granted | 0.48 | 0.56 | 0.42 |
Weighted Average Exercise Price, Forfeited and expired | 0.49 | 0.47 | 0.50 |
Weighted Average Exercise Price, Exercised | 0.43 | 0.12 | 0.37 |
Weighted Average Exercise Price, Outstanding, Ending Balance | 0.47 | $ 0.47 | $ 0.42 | $ 0.43
Weighted Average Exercise Price, Exercisable | 0.47 |  |  |
Weighted Average Exercise Price, Vested and expected to vest | $ 0.47 |  |  |
Weighted Average Remaining Contractual Life |  |  |  |
Weighted Average Remaining Contractual Life, Outstanding | 6 years 4 months 24 days | 6 years 4 months 24 days | 6 years 8 months 12 days | 7 years 1 month 6 days
Weighted Average Remaining Contractual Life, Exercisable | 4 years 6 months |  |  |
Weighted Average Remaining Contractual Life, Vested and expected to vest | 5 years 7 months 6 days |  |  |
Aggregate Intrinsic Value |  |  |  |
Aggregate Intrinsic Value, Outstanding, Beginning Balance |  | $ 15,300 | $ 1,800 |
Aggregate Intrinsic Value, Exercised | $ 20 | $ 2,300 | 2,100 |
Aggregate Intrinsic Value, Outstanding, Ending Balance |  |  | $ 15,300 | $ 1,800

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- Definition Share-based Compensation Arrangement by Share-based Payment Award, Options, Aggregate Intrinsic Value [Abstract] + References No definition available. + Details
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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 Share-based Compensation Arrangement by Share-based Payment Award, Options, Weighted Average Exercise Price [Abstract] + References No definition available. + Details
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- Definition Share-based Compensation Arrangement by Share-based Payment Award, Options, Weighted Average Remaining Contractual Life [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://fasb.org/us-gaap/role/ref/legacyRef -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=116856206&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://fasb.org/us-gaap/role/ref/legacyRef -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=116856206&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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=116856206&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://fasb.org/us-gaap/role/ref/legacyRef -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=116856206&loc=d3e5070-113901 + Details
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- Definition Weighted average price of options that were either forfeited or expired. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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=116856206&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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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=116856206&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://fasb.org/us-gaap/role/ref/legacyRef -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=116856206&loc=d3e5070-113901 + Details
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- Definition Number of fully vested and expected to vest exercisable options that may be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(2) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Weighted-average exercise price, at which grantee can acquire shares reserved for issuance, for fully vested and expected to vest exercisable or convertible options. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(2) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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