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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

X

- 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

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

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: