At-the-Market Offering (Additional Information) (Details) $ in Millions	Dec. 31, 2023 USD ($)
At the Market Offering [Line Items]
At-the-market offering, company may offer to sell, january 31, 2024 amendment	$ 75.0

At-the-Market offering, Company may offer to sell, January 31, 2024 Amendment

No definition available.

Name:	velo_AtTheMarketOfferingCompanyMayOfferToSellJanuary312024Amendment
Namespace Prefix:	velo_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant