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Basis of Presentation and Summary of Significant Accounting Policies - Offering costs (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
General and administrative |  |
Subsidiary, Sale of Stock [Line Items] |  |
Offering costs | $ 22.1 | $ 3.6

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- Definition Amount of expenses incurred towards offering cost. + References No definition available. + Details
Name: | dvh_OfferingCosts
Namespace Prefix: | dvh_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- 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
Name: | us-gaap_SubsidiarySaleOfStockLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_IncomeStatementLocationAxis=us-gaap_GeneralAndAdministrativeExpenseMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |