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Deferred revenue and income - Schedule of Deferred Revenue and Income (Parenthetical) (Detail) - USD ($) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Deferred Revenue Arrangement [Line Items] |  |  |  |  |
Reimbursement received from depository |  |  | $ 127,000 |  |
Deferred income withholding tax |  |  | $ 42,000 |  |
Deferred income amortized depositary service period |  |  | 5 years |  |
Deferred revenue and income, non-current | [1] |  | $ 3,242,000 | $ 4,082,000 |
Increase Decrease In Deferred Government Grants |  | $ 1,224,000 | (3,493,000) | (3,473,000) | $ (1,969,000)
Deferred Income Amortization Period For Government Grant |  | 5 years |  |  |
Membership subscription revenues [Member] |  |  |  |  |
Deferred Revenue Arrangement [Line Items] |  |  |  |  |
Deferred revenue and income, non-current |  |  | 425,000 | 820,000 |
Government grants [Member] |  |  |  |  |
Deferred Revenue Arrangement [Line Items] |  |  |  |  |
Deferred revenue and income, non-current |  |  | 2,509,000 | 2,719,000 |
Reimbursement from the depository [Member] |  |  |  |  |
Deferred Revenue Arrangement [Line Items] |  |  |  |  |
Deferred revenue and income, non-current |  |  | $ 308,000 | $ 543,000 |
[1] | As of December 31, 2017, the non-current portion included membership subscription revenue of USD 425,000 (2016: USD 820,000), government grants of USD 2,509,000 (2016: USD 2,719,000), and reimbursement from the depositary of USD 308,000 (2016: USD 543,000).

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- Definition The noncurrent portion of deferred revenue amount as of balance sheet date. Deferred revenue is a liability related to a revenue producing activity for which revenue has not yet been recognized, and is not expected to be recognized in the next twelve months. Generally, an entity records deferred revenue when it receives consideration from a customer before achieving certain criteria that must be met for revenue to be recognized in conformity with GAAP. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 8 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82887183&loc=d3e6935-107765 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 605 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 13.A.3(c).Q3) -URI http://asc.fasb.org/extlink&oid=65893310&loc=d3e214044-122780 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 605 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 13.A.4(a).Q1) -URI http://asc.fasb.org/extlink&oid=65893310&loc=d3e214044-122780 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 605 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 13.A.3(b)) -URI http://asc.fasb.org/extlink&oid=65893310&loc=d3e214044-122780 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 605 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 13.A.3(b).Q1(c)) -URI http://asc.fasb.org/extlink&oid=65893310&loc=d3e214044-122780 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 605 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 13.A.3) -URI http://asc.fasb.org/extlink&oid=65893310&loc=d3e214044-122780 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 605 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 13.A.3(b).Q2) -URI http://asc.fasb.org/extlink&oid=65893310&loc=d3e214044-122780 + Details
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- Definition Deferred income amortization period for reimbursement from depository. + References No definition available. + Details
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- Definition Proceeds from reimbursement of initial public offering expenses. + References No definition available. + Details
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