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Stockholders equity - Schedule of Warrants, valuation assumptions (Detail) - Strategic Warrants Two [Member] - Strategic Market Warrants [Member] | Sep. 30, 2022 | May 09, 2022
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Share Price (S0) |  |
Strategic Warrants Outstanding, Measurement Input | 0.1132 |
Maturity Date |  |
Strategic Warrants Outstanding, Maturity Date |  | Dec. 31, 2025
Time (T) - Years |  |
Strategic Warrants Outstanding, Term |  | 3 years 7 months 17 days
Strike Price [Member] |  |
Strategic Warrants Outstanding, Measurement Input | 0.15 |
Risk-free Rate (r) |  |
Strategic Warrants Outstanding, Measurement Input |  | 0.0285
Volatility (σ) |  |
Strategic Warrants Outstanding, Measurement Input |  | 0.0793
Dividend Yield (q) |  |
Strategic Warrants Outstanding, Measurement Input |  | 0
Warrant Value (US$) |  |
Strategic Warrants Outstanding, Measurement Input | 0.0011 |

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- Definition Expiration date of outstanding warrant and right embodying unconditional obligation requiring redemption by transferring asset at specified or determinable date or upon event certain to occur, in YYYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 + Details
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- Definition Value of input used to measure outstanding warrant and right embodying unconditional obligation requiring redemption by transferring asset at specified or determinable date or upon event certain to occur. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 + Details
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- Definition Period between issuance and expiration of outstanding warrant and right embodying unconditional obligation requiring redemption by transferring asset at specified or determinable date or upon event certain to occur, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 + Details
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