Stockholders’ Deficit and Stock-Based Compensation - Additional Information (Details) $ / shares in Units, $ in Millions					1 Months Ended		3 Months Ended	12 Months Ended
	Dec. 27, 2024 USD ($) shares	Oct. 18, 2024 USD ($) $ / shares	Dec. 31, 2023 USD ($) $ / shares shares	Feb. 15, 2022 $ / shares shares	Dec. 31, 2023 USD ($) $ / shares shares	Nov. 30, 2023 shares	Mar. 20, 2025 USD ($) shares	Dec. 31, 2024 USD ($) $ / shares shares	Dec. 31, 2023 USD ($) $ / shares shares	Oct. 30, 2023 USD ($) shares	Oct. 23, 2023 $ / shares	Oct. 02, 2023 USD ($) shares	Aug. 29, 2023 $ / shares
Share-Based Compensation
Preferred stock authorized (in shares)								10,000,000
Preferred stock par value (in dollar per share) | $ / shares								$ 0.001
Warrants issued (in shares)										1,004,148
Warrants fair value | $			$ 0.0		$ 0.0				$ 0.0
Warrant price in cash (in dollars per share) | $ / shares													$ 1.20
Number of warrants tendered (in shares)												2,213,652
Purchase price of warrants | $										$ 0.4		$ 2.7
Redemption price per warrant (in dollars per share) | $ / shares											$ 0.35
Restricted stock units
Share-Based Compensation
Vesting period (in years)								3 years
Weighted-average period over which unamortized stock-based compensation expense will recognized (in years)								7 months 17 days
Number of shares withheld (in shares)								99,550
Unrecognized stock-based compensation related to unvested RSUs | $								$ 0.4
2022 Omnibus Plan
Share-Based Compensation
Number of shares reserved for issuance (in shares)								1,500,000
Shares available for grant								2,452,030
Stock-based compensation recognized | $								$ 1.6	2.1
Accrued bonus | $									$ 1.4
2022 Omnibus Plan | Options to purchase common stock
Share-Based Compensation
Vesting period (in years)								3 years
Contractual period (in years)								10 years
Unrecognized stock-based compensation related to stock options | $								$ 0.2
Number of shares related to unvested stock options (in shares)								162,099
Weighted-average period over which unamortized stock-based compensation expense will recognized (in years)								7 months 20 days
New Circle Principal Investments LLC
Share-Based Compensation
Share purchase agreement, maximum amount | $		$ 20.0
Share purchase agreement, maximum issuable amount, percent		19.99%
Sale of stock, number of shares authorized (in shares)	8,500,000
Legal fees | $	$ 0.1
Measurement Input, Discount Rate
Share-Based Compensation
Measurement input			0.0194		0.0194				0.0194
Measurement Input, Expected Term
Share-Based Compensation
Warrants exercise price (in dollars per share)			5 years		5 years				5 years
Measurement Input, Price Volatility
Share-Based Compensation
Measurement input			0.66		0.66				0.66
Measurement Input, Expected Dividend Rate
Share-Based Compensation
Measurement input			0		0				0
Warrant
Share-Based Compensation
Stock and warrants issued during period, shares, options exercised (in shares)						10,500		10,500
IPO
Share-Based Compensation
Number of shares of common stock (in shares)				1
Units issued in IPO (in shares)				2,800,000
Number of warrants to purchase each share (in shares)				1
Warrants exercise price (in dollars per share) | $ / shares				$ 5.50
Warrants exercise price (in dollars per share)				5 years
warrants were outstanding (in shares)								0
Over-Allotment Option
Share-Based Compensation
Term of underwriters (in days)				45 days
Purchase option - number of additional units (in shares)				140,000
Exercise price of additional units (in dollars per share) | $ / shares				$ 6.60
Public offering price per unit sold (as percent)				120.00%
Stock and warrants issued during period, shares, options exercised (in shares)						70,000		70,000
Over-Allotment Option | Maximum
Share-Based Compensation
Warrants issued (in shares)				420,000
Common Class A
Share-Based Compensation
Common stock, authorized (in shares)			160,000,000		160,000,000			160,000,000	160,000,000
Common stock, par value (in dollars per share) | $ / shares			$ 0.001		$ 0.001			$ 0.001	$ 0.001
Common Class A | New Circle Principal Investments LLC
Share-Based Compensation
Common stock, par value (in dollars per share) | $ / shares		$ 0.001
Number of shares issued in transaction (in shares)								1,580,000
Issuance of Class A common stock, net of transaction costs (in shares)	62,762
Consideration received on transaction | $								$ 3.0
Common Class A | New Circle Principal Investments LLC | Subsequent Event
Share-Based Compensation
Number of shares issued in transaction (in shares)							1,389,351
Consideration received on transaction | $							$ 1.9
Common Class A | Over-Allotment Option
Share-Based Compensation
Warrants exercise price (in dollars per share) | $ / shares				$ 0.012
warrants were outstanding (in shares)								0
Warrants issued (in shares)				420,000
Purchase option - number of warrants (in shares)				21,000
Public offering price per warrant sold (as percent)				120.00%
Common Class B
Share-Based Compensation
Common stock, authorized (in shares)			20,000,000		20,000,000			20,000,000	20,000,000
Common stock, par value (in dollars per share) | $ / shares			$ 0.001		$ 0.001			$ 0.001	$ 0.001
DDH LLC
Share-Based Compensation
Noneconomic voting rights (as a percent)								100.00%
Direct Digital Management LLC | Common Class A
Share-Based Compensation
Number of units exchanged (in shares)			410,000		410,000			0	410,000
Number of shares of common stock (in shares)								1
Direct Digital Management LLC | Common Class B
Share-Based Compensation
Number of shares of common stock (in shares)								10,868,000