Tax Receivable Agreement and Income Taxes - Additional Information (Details) - USD ($)	1 Months Ended	3 Months Ended		12 Months Ended
	Mar. 31, 2025	Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2024
Subsidiary, Sale of Stock [Line Items]
Percentage of net cash saving to be paid		85.00%
Percentage of net cash saving to be retained		15.00%
Total TRA liability recognized	$ 41,000	$ 41,000		$ 41,000
Outside basis difference in partnership		0		0
Aggregate payment on tax receivable agreement		0	$ 0
Derecognition of tax receivable agreement liability		0	$ 0
Uncertain tax positions	$ 0	0		0
Penalties and interest related to uncertain tax positions		$ 0		$ 0
Class A Common Stock | Direct Digital Management LLC
Subsidiary, Sale of Stock [Line Items]
Conversion of stock, shares converted (in shares)	70,000	70,000	0