Velo3D, Inc. Quarterly report pursuant to Section 13 or 15(d)

Equity Instruments - Common Stock Reserved for Issuance (Details) - USD ($)	1 Months Ended
	Feb. 28, 2023	Mar. 31, 2024	Dec. 31, 2023
Class of Stock [Line Items]
Shares of common stock reserved (in shares)		92,957,307	77,183,168
At-the-Market offering, Company may offer to sell, January 31, 2024 Amendment		$ 75,000,000
2021 Equity Incentive Plan
Class of Stock [Line Items]
Shares of common stock reserved (in shares)		12,920,934
2021 Employee Stock Purchase Plan
Class of Stock [Line Items]
Shares of common stock reserved (in shares)		2,584,186
ATM Sales Agreement
Class of Stock [Line Items]
Shares of common stock reserved (in shares)		20,000,000
Value of Shares Sold, May Offer and Sell up to	$ 40,000,000
Common stock warrants
Class of Stock [Line Items]
Shares of common stock reserved (in shares)		50,945,000	50,945,000
Shares available for future grant under 2021 Equity Incentive Plan \| 2021 Stock Option Plan
Class of Stock [Line Items]
Shares of common stock reserved (in shares)		29,230,966	16,041,013
Reserved for At-the-Market offering
Class of Stock [Line Items]
Shares of common stock reserved (in shares)		2,825,941	2,825,941
Reserved for employee stock purchase plan
Class of Stock [Line Items]
Shares of common stock reserved (in shares)		9,955,400	7,371,214