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Share-based compensation (Tables) | 12 Months Ended
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Dec. 31, 2021
Summary of Share Option Activity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ |  | ​ |  | ​ |  | 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, 2019 |  | 16,500 |  | 3.97 |  | — |  | 1.37 |  | —
Vested and expected to vest as of January 1, 2019 |  | 16,500 |  | 3.97 |  | 1.56 |  | 1.37 |  | —
Exercisable as of January 1, 2019 |  | 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 as of December 31, 2019 |  | 10,000 |  | 3.97 |  | 1.01 |  | 1.16 |  | —
Exercisable as of 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 as of December 31, 2020 and 2021 |  | — |  | — |  | — | ​ | — | ​ | —
Schedule of Recognized Compensation Costs | Total compensation costs recognized for the years ended December 31, 2019, 2020 and 2021 are as follows:
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Years ended December 31,
(In thousands) |  | 2019 |  | 2020 |  | 2021
Sales and marketing expenses |  | 381 |  | 185 |  | 59
General and administrative expenses |  | 2,453 |  | 1,209 |  | 4,682
Research and development expenses |  | 2,594 |  | 916 |  | 1,429
Total |  | 5,428 |  | 2,310 |  | 6,170
2013 Plan [Member] |
Summary of Restricted Shares Activities | A summary of the restricted shares activities under the 2013 Plan for the years ended December 31, 2019, 2020 and 2021 is presented below:
​ | ​ | ​
​ |  | Number of
​ | ​ | restricted shares
Unvested as of January 1, 2019 |  | 34,175
Vested |  | (27,475)
Forfeited |  | (6,700)
Unvested as of December 31, 2019 |  | —
Expected to vest as of December 31, 2019 |  | —
2010 share incentive plan [Member] |
Summary of Restricted Shares Activities | A summary of the restricted shares activities under the 2010 Plan for the years ended December 31, 2019, 2020 and 2021 is presented below:
​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Weighted-average
​ | ​ | Number of | ​ | grant-date fair
​ |  | restricted shares |  | value(USD)
Unvested as of January 1, 2019 |  | 6,652,040 |  |
Expected to vest as of January 1, 2019 | ​ | 5,654,234 |  |
Granted |  | 800,000 |  | 0.81
Vested |  | (1,296,540) |  |
Forfeited |  | (971,000) |  |
Unvested as of December 31, 2019 |  | 5,184,500 |  |
Expected to vest as of December 31, 2019 |  | 4,406,825 |  | ​
Vested |  | (965,500) |  | ​
Forfeited |  | (2,959,000) |  | ​
Unvested as of December 31, 2020 |  | 1,260,000 |  | ​
Expected to vest at December 31, 2020 |  | 1,071,000 |  | ​
Vested |  | (400,000) |  | ​
Forfeited |  | (210,000) |  | ​
Unvested as of December 31, 2021 |  | 650,000 |  | ​
Expected to vest as of December 31, 2021 |  | 552,500 |  | ​
2014 Plan [Member] |
Summary of Restricted Shares Activities | A summary of the restricted shares activities under the 2014 Plan for the years ended December 31, 2019, 2020 and 2021 is presented below:
​ | ​ | ​
​ |  | Number of
​ | ​ | restricted
​ | ​ | shares
Unvested as of January 1, 2019 |  | 3,476,650
Vested |  | (1,318,450)
Forfeited |  | (837,000)
Unvested as of December 31, 2019 |  | 1,321,200
Expected to vest as of December 31, 2019 |  | 1,123,020
Unvested as of January 1, 2020 |  | 1,321,200
Vested |  | (228,200)
Forfeited |  | (1,067,000)
Unvested as of December 31, 2020 |  | 26,000
Expected to vest as of December 31, 2020 |  | 22,100
Unvested as of January 1, 2021 |  | 26,000
Vested |  | (26,000)
Unvested as of December 31, 2021 |  | —
Expected to vest as of December 31, 2021 |  | —
2020 Incentive Plan |
Summary of Restricted Shares Activities | ​
​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Weighted-average
​ |  | Number of |  | grant-date fair
​ | ​ | restricted shares | ​ | value (USD)
Unvested as of January 1,2021 |  | — |  |
Granted |  | 31,091,840 |  | 0.83
Vested |  | (2,429,965) |  |
Forfeited |  | (2,777,500) |  |
Unvested as of December 31, 2021 |  | 25,884,375 |  |
Expected to vest as of December 31, 2021 |  | 19,413,281 |  |

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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=122041274&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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