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v3.21.2

Warrants - (Detail) - $ / shares |  |  | 1 Months Ended |  |
--- | --- | --- | --- | --- | ---
Mar. 28, 2016 | Dec. 22, 2015 | Nov. 30, 2020 | Oct. 31, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Class of Warrant or Right [Line Items] |  |  |  |  |  |
Class of warrants or rights outstanding |  |  |  |  |  | 26,385
Number of warrants exercised |  |  | 7,531 | 18,854 |  |
Exercise price per share |  |  | $ 21.24 | $ 14.85 |  |
Common stock issued for cashless exercise |  |  | 6,041 | 16,051 |  |
Warrants One [Member] |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |
Class of warrants or rights number of warrants issued during the period | 7,531 | 18,854 |  |  |  |
Class of warrants or rights outstanding |  |  |  |  | 0 |

X
- Definition Class of warrants or rights number of warrants issued during the period. + References No definition available. + Details
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Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of common stock issued in exchange for share options (or share units) exercised via net exercise (cashless) method during the current period. + References No definition available. + Details
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Namespace Prefix: | twst_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number stock warrants exercise during the period. + References No definition available. + Details
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Period Type: | duration

X
- Definition Exercise price per share or per unit of warrants or rights outstanding. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21475-112644 + Details
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X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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X
- Definition Number of warrants or rights outstanding. + References No definition available. + Details
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Period Type: | instant

X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |