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Share-based compensation - Summary of Stock Option Activity (Detail) - Share options - 2010 Plan - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Number of share options |  |  |  |
Outstanding at beginning of period | 10,000 | 16,500 | 389,815 |
Vested and expected to vest |  | 10,000 | 16,500 | 389,693
Exercisable |  | 10,000 | 16,500 | 389,190
Expired | (10,000) | (6,500) | (373,315) |
Outstanding at end of period |  | 10,000 | 16,500 | 389,815
Weighted average exercise price (USD) |  |  |  |
Outstanding at beginning of period | $ 3.97 | $ 3.97 | $ 3.90 |
Vested and expected to vest |  | 3.97 | 3.97 | $ 3.90
Exercisable |  | 3.97 | 3.97 | 3.90
Expired | $ 3.97 | 3.97 | 3.89 |
Outstanding at end of period |  | 3.97 | 3.97 | 3.90
Weighted average grant-date fair value (USD) |  |  |  |
Vested and expected to vest |  | 1.01 | 1.56 | 0.95
Exercisable |  | $ 1.01 | $ 1.56 | $ 0.95
Share option activity - additional disclosures |  |  |  |
Weighted-average remaining contractual life, vested and expected to vest | 0 years | 1 year 1 month 28 days | 1 year 4 months 13 days | 1 year 7 months 20 days
Weighted-average remaining contractual life, exercisable | 0 years | 1 year 1 month 28 days | 1 year 4 months 13 days | 1 year 7 months 20 days
Weighted-average remaining contractual life, outstanding | 0 years | 1 year 1 month 28 days | 1 year 4 months 13 days | 1 year 7 months 20 days
Aggregate intrinsic value, vested and expected to vest | $ 0 | $ 0 | $ 0 | $ 0
Aggregate intrinsic value, exercisable | 0 | 0 | 0 | 0
Aggregate intrinsic value, outstanding | $ 0 | $ 0 | $ 0 | $ 0

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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=120381028&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=120381028&loc=d3e5070-113901 + Details
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- Definition Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements. + 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)(4) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + 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=120381028&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=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 (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Amount by which current fair value of underlying stock exceeds exercise price of fully vested and expected to vest options outstanding. 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) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Number of fully vested and expected to vest options outstanding that can 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)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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