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Share-based compensation (Tables) | 12 Months Ended
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Dec. 31, 2020
Summary of Share Option Activity | The following table summarizes the share option activities for the years ended December 31, 2018, 2019 and 2020:
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ |  | ​ |  | ​ |  | 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 (USD)
Outstanding, January 1, 2018 |  | 389,815 |  | 3.90 |  | — |  | 1.64 |  | —
Vested and expected to vest at January 1, 2018 |  | 389,693 |  | 3.90 |  | 0.95 |  | 1.64 |  | —
Exercisable at January 1, 2018 |  | 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 | ​ | —
Expired |  | (10,000) |  | 3.97 |  | ​ | ​ | ​ | ​ | ​
Outstanding, December 31, 2020 |  | — |  | — |  | — | ​ | — | ​ | —
Vested and expected to vest at December 31, 2020 |  | — |  | — |  | — | ​ | — | ​ | —
Exercisable at December 31, 2020 |  | — |  | — |  | — | ​ | — | ​ | —
Schedule of Recognized Compensation Costs | Total compensation costs recognized for the years ended December 31, 2018, 2019 and 2020 are as follows:
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Years ended December 31,
(In thousands) |  | 2018 |  | 2019 |  | 2020
Sales and marketing expenses |  | 404 |  | 381 |  | 185
General and administrative expenses |  | 2,245 |  | 2,453 |  | 1,209
Research and development expenses |  | 2,645 |  | 2,594 |  | 916
Total |  | 5,294 |  | 5,428 |  | 2,310
2013 Plan |
Summary of Restricted Shares Activities | A summary of the restricted shares activities under the 2013 Plan for the years ended December 31, 2018, 2019 and 2020 is presented below:
​ | ​ | ​
​ |  | Number of
​ | ​ | restricted shares
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, 2018, 2019 and 2020 is presented below:
​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Weighted-average
​ | ​ | Number of | ​ | grant-date fair
​ |  | restricted shares |  | value
Unvested at January 1, 2018 |  | 1,272,150 |  |
Expected to vest at January 1, 2018 | ​ | 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 |  | ​
Vested |  | (965,500) |  | ​
Forfeited |  | (2,959,000) |  | ​
Unvested at December 31, 2020 |  | 1,260,000 |  | ​
Expected to vest at December 31, 2020 |  | 1,071,000 |  | ​
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, 2019 and 2020 is presented below:
​ | ​ | ​
​ |  | Number of
​ | ​ | restricted
​ | ​ | shares
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
Unvested at January 1, 2020 |  | 1,321,200
Vested |  | (228,200)
Forfeited |  | (1,067,000)
Unvested at December 31, 2020 |  | 26,000
Expected to vest at December 31, 2020 |  | 22,100

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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=120381028&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=120381028&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=120381028&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=120381028&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=120381028&loc=d3e5070-113901 + Details
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- Definition Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References No definition available. + Details
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