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v3.26.1

Summary of Significant Accounting Policies - Additional Information (Detail) | Jun. 30, 2026 USD ($)
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Accounting Policies [Line Items] |
Cash FDIC insured amount | $ 250,000

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- Definition Accounting policies. + References No definition available. + Details
Name: | qttb_AccountingPoliciesLineItems
Namespace Prefix: | qttb_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The amount of cash deposited in financial institutions as of the balance sheet date that is insured by the Federal Deposit Insurance Corporation. + References No definition available. + Details
Name: | us-gaap_CashFDICInsuredAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant