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Share-based compensation (Tables) | 12 Months Ended
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Dec. 31, 2019
Summary of Share Option Activity | The following table summarizes the share option activities for the years ended December 31, 2017, 2018 and 2019:
|  |  |  |  |  |  |  | Weighted |  |
|  |  |  | Weighted |  | Weighted- |  | average |  |
|  |  |  | average |  | average |  | remaining |  | Aggregate
|  | Number of |  | exercise |  | grant-date |  | contractual life |  | intrinsic
|  | share options |  | price (USD) |  | fair value (USD) |  | (years) |  | value (In thousands)
Outstanding, January 1,2017 |  | 1,493,470 |  | 2.65 |  | — |  | 3.39 |  | 6
Vested and expected to vest at January 1,2017 |  | 1,440,923 |  | 2.67 |  | 0.85 |  | 3.24 |  | 6
Exercisable at January 1, 2017 |  | 1,217,050 |  | 2.70 |  | 0.84 |  | 3.20 |  | 6
Forfeited |  | (109,925) |  | 2.89 |  |  |  |  |  |
Expired |  | (989,730) |  | 2.28 |  |  |  |  |  |
Exercised |  | (4,000) |  | 0.83 |  |  |  |  |  |
Outstanding, December 31,2017 |  | 389,815 |  | 3.90 |  | — |  | 1.64 |  | —
Vested and expected to vest at December 31, 2017 |  | 389,693 |  | 3.90 |  | 0.95 |  | 1.64 |  | —
Exercisable at December 31, 2017 |  | 389,190 |  | 3.90 |  | 0.95 |  | 1.64 |  | —
Expired |  | (373,315) |  | 3.89 |  |  |  |  |  |
Outstanding, December 31, 2018 |  | 16,500 |  | 3.97 |  | — |  | 1.37 |  | —
Vested and expected to vest at December 31, 2018 |  | 16,500 |  | 3.97 |  | 1.56 |  | 1.37 |  | —
Exercisable at December 31, 2018 |  | 16,500 |  | 3.97 |  | 1.56 |  | 1.37 |  | —
Expired |  | (6,500) |  | 3.97 |  |  |  |  |  |
Outstanding, December 31, 2019 |  | 10,000 |  | 3.97 |  | — |  | 1.16 |  | —
Vested and expected to vest at December 31, 2019 |  | 10,000 |  | 3.97 |  | 1.01 |  | 1.16 |  | —
Exercisable at December 31, 2019 |  | 10,000 |  | 3.97 |  | 1.01 |  | 1.16 |  | —
Schedule of Recognized Compensation Costs | Total compensation costs recognized for the years ended December 31, 2017, 2018 and 2019 are as follows:
|  | Years ended December 31,
(In thousands) |  | 2017 |  | 2018 |  | 2019
Sales and marketing expenses |  | 88 |  | 404 |  | 381
General and administrative expenses |  | 5,800 |  | 2,245 |  | 2,453
Research and development expenses |  | 2,442 |  | 2,645 |  | 2,594
Total |  | 8,330 |  | 5,294 |  | 5,428
2013 Plan |
Summary of Restricted Shares Activities | A summary of the restricted shares activities under the 2013 Plan for the years ended December 31, 2017, 2018 and 2019 is presented below:
|  | Number of
|  | restricted shares
Unvested at January 1, 2017 |  | 1,714,535
Vested |  | (996,835)
Forfeited |  | (129,940)
Unvested at December 31, 2017 |  | 587,760
Expected to vest at December 31, 2017 |  | 499,596
Unvested at January 1, 2018 |  | 587,760
Vested |  | (525,140)
Forfeited |  | (28,445)
Unvested at December 31, 2018 |  | 34,175
Expected to vest at December 31, 2018 |  | 29,049
Unvested at January 1, 2019 |  | 34,175
Vested |  | (27,475)
Forfeited |  | (6,700)
Unvested at December 31, 2019 |  | —
Expected to vest at December 31, 2019 |  | —
2010 Plan |
Summary of Restricted Shares Activities | A summary of the restricted shares activities under the 2010 Plan for the years ended December 31, 2017, 2018 and 2019 is presented below:
|  |  |  | Weighted-Average
|  | Number of |  | Grant-Date Fair
|  | restricted shares |  | Value
Unvested at January 1, 2017 |  | 943,220 |  |
Expected to vest at January 1, 2017 |  | 801,737 |  |
Granted |  | 2,050,000 |  | 0.69
Vested |  | (115,125) |  |
Forfeited |  | (1,605,945) |  |
Unvested at December 31, 2017 |  | 1,272,150 |  |
Expected to vest at December 31, 2017 |  | 1,081,327 |  |
Granted |  | 6,750,520 |  | 2.32
Vested |  | (267,630) |  |
Forfeited |  | (1,103,000) |  |
Unvested at December 31, 2018 |  | 6,652,040 |  |
Expected to vest at December 31, 2018 |  | 5,654,234 |  |
Granted |  | 800,000 |  | 0.81
Vested |  | (1,296,540) |  |
Forfeited |  | (971,000) |  |
Unvested at December 31, 2019 |  | 5,184,500 |  |
Expected to vest at December 31, 2019 |  | 4,406,825 |  |
2014 Plan |
Summary of Restricted Shares Activities | A summary of the restricted shares activities under the 2014 Plan for the years ended December 31, 2018 and 2019 is presented below:
|  | Number of |
|  | restricted |
|  | shares |
Unvested at January 1,2017 |  | 10,276,300 |
Vested |  | (2,447,950) |
Forfeited |  | (2,022,000) |
Unvested at December 31, 2017 |  | 5,806,350 |
Expected to vest at December 31, 2017 |  | 4,935,398 |
Unvested at January 1, 2018 |  | 5,806,350 |
Vested |  | (2,086,450) |
Forfeited |  | (243,250) |
Unvested at December 31, 2018 |  | 3,476,650 |
Expected to vest at December 31, 2018 |  | 2,955,153 |
Unvested at January 1, 2019 |  | 3,476,650 |
Vested |  | (1,318,450) |
Forfeited |  | (837,000) |
Unvested at December 31, 2019 |  | 1,321,200 |
Expected to vest at December 31, 2019 |  | 1,123,020 |

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- Definition Tabular disclosure of allocation of amount expensed and capitalized for award under share-based payment arrangement to statement of income or comprehensive income and statement of financial position. Includes, but is not limited to, corresponding line item in financial statement. + 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 (h)(1) -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 S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5047-113901 + Details
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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + 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) -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 (e) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 Reference 3: 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) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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