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Stockholders’ Deficit and Stock-Based Compensation - Additional Information (Details)
 1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Oct. 28, 2025
shares
Oct. 24, 2025
shares
Oct. 14, 2025
USD ($)
Oct. 13, 2025
shares
Sep. 30, 2025
USD ($)
$ / shares
shares
Aug. 08, 2025
USD ($)
$ / shares
Dec. 31, 2024
USD ($)
$ / shares
shares
Dec. 27, 2024
USD ($)
shares
Oct. 18, 2024
USD ($)
$ / shares
Feb. 15, 2022
$ / shares
shares
Nov. 30, 2023
shares
Sep. 30, 2025
USD ($)
$ / shares
shares
Sep. 30, 2025
USD ($)
$ / shares
shares
Sep. 30, 2024
USD ($)
shares
Dec. 31, 2024
USD ($)
$ / shares
shares
Jun. 09, 2025
shares
Subsidiary, Sale of Stock [Line Items]                                
Preferred stock authorized (in shares)         10,000,000   10,000,000         10,000,000 10,000,000   10,000,000  
Preferred stock par value (in dollar per share) | $ / shares         $ 0.001   $ 0.001         $ 0.001 $ 0.001   $ 0.001  
Warrants fair value | $         $ 0             $ 0 $ 0      
Preferred stock, value, issued | $         0   $ 0         0 0   $ 0  
Issuance of Series A Convertible Preferred Stock, net of issuance costs | $                       21,220,000 $ 21,220,000      
Restricted stock units                                
Subsidiary, Sale of Stock [Line Items]                                
Number of shares issued in transaction (in shares)                         24,469      
Vesting period (in years)                         3 years      
Weighted-average period over which unamortized stock-based compensation expense will recognized (in years)                         9 months 25 days      
Number of shares withheld (in shares)                         61,086      
Unrecognized stock-based compensation related to unvested RSUs | $         $ 600,000             $ 600,000 $ 600,000      
2022 Omnibus Plan                                
Subsidiary, Sale of Stock [Line Items]                                
Number of shares reserved for issuance (in shares)         3,500,000             3,500,000 3,500,000      
Number of shares issuable                               4,000,000
2022 Omnibus Plan                                
Subsidiary, Sale of Stock [Line Items]                                
Stock-based compensation recognized | $                         $ 1,100,000 $ 800,000    
2022 Omnibus Plan | Options to purchase common stock                                
Subsidiary, Sale of Stock [Line Items]                                
Vesting period (in years)                         3 years      
Contractual period (in years)                         10 years      
Unrecognized stock-based compensation related to unvested stock options | $         $ 300,000             $ 300,000 $ 300,000      
Number of shares related to unvested stock options (in shares)         621,659             621,659 621,659      
Weighted-average period over which unamortized stock-based compensation expense will recognized (in years)                         11 months 1 day      
New Circle Principal Investments LLC                                
Subsidiary, Sale of Stock [Line Items]                                
Share purchase agreement, maximum amount | $                 $ 100,000,000              
Share purchase agreement, maximum issuable amount, percent                 19.99%              
Sale of stock, number of shares authorized (in shares)               8,500,000                
Legal fees | $               $ 100,000                
Share purchase agreement, termination period                 36 months              
Share purchase agreement, termination written notice period                 5 days              
New Circle Principal Investments LLC | Subsequent Event                                
Subsidiary, Sale of Stock [Line Items]                                
Sale of stock, number of shares authorized (in shares)       50,000,000                        
Measurement Input, Discount Rate                                
Subsidiary, Sale of Stock [Line Items]                                
Measurement input         0.0194             0.0194 0.0194      
Measurement Input, Expected Term                                
Subsidiary, Sale of Stock [Line Items]                                
Warrants exercisable term (in years)         5 years             5 years 5 years      
Measurement Input, Price Volatility                                
Subsidiary, Sale of Stock [Line Items]                                
Measurement input         0.66             0.66 0.66      
Measurement Input, Expected Dividend Rate                                
Subsidiary, Sale of Stock [Line Items]                                
Measurement input         0             0 0      
Warrant                                
Subsidiary, Sale of Stock [Line Items]                                
Stock and warrants issued during period, shares, options exercised (in shares)                     10,500          
Stock and warrants outstanding (in shares)             10,500                  
Public Warrants                                
Subsidiary, Sale of Stock [Line Items]                                
Stock and warrants outstanding (in shares)         0   0                  
Preferred Stock                                
Subsidiary, Sale of Stock [Line Items]                                
Issuance of Class A common stock, net of transaction costs (in shares)                       25,000 25,000      
IPO                                
Subsidiary, Sale of Stock [Line Items]                                
Number of shares of common stock (in shares)                   1            
Number of warrants to purchase each share (in shares)                   1            
Warrants exercise price (in dollars per share) | $ / shares                   $ 5.50            
Over-Allotment Option                                
Subsidiary, Sale of Stock [Line Items]                                
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          
Stock and warrants outstanding (in shares)         70,000                      
Class A Common Stock                                
Subsidiary, Sale of Stock [Line Items]                                
Common stock, authorized (in shares)         160,000,000   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   $ 0.001  
Class A Common Stock | Subsequent Event                                
Subsidiary, Sale of Stock [Line Items]                                
Common stock, authorized (in shares)       760,000,000                        
Units of share converted (in shares) 3,750,607                              
Class A Common Stock | New Circle Principal Investments LLC                                
Subsidiary, Sale of Stock [Line Items]                                
Common stock, par value (in dollars per share) | $ / shares                 $ 0.001              
Issuance of Class A common stock, net of transaction costs (in shares)               62,762                
Number of shares issued in transaction (in shares)                         9,759,351   1,580,000  
Consideration received on transaction | $                         $ 5,900,000   $ 3,000,000  
Class A Common Stock | New Circle Principal Investments LLC | Subsequent Event                                
Subsidiary, Sale of Stock [Line Items]                                
Issuance of Class A common stock, net of transaction costs (in shares)   100,000                            
Class A Common Stock | Over-Allotment Option                                
Subsidiary, Sale of Stock [Line Items]                                
Warrants exercise price (in dollars per share) | $ / shares                   $ 0.012            
Purchase option - number of warrants (in shares)                   21,000            
Public offering price per warrant sold (as percent)                   120.00%            
Class B Common Stock                                
Subsidiary, Sale of Stock [Line Items]                                
Common stock, authorized (in shares)         20,000,000   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   $ 0.001  
Convertible Preferred Stock                                
Subsidiary, Sale of Stock [Line Items]                                
Preferred stock authorized (in shares)         25,000             25,000 25,000      
Preferred stock par value (in dollar per share) | $ / shares         $ 0.001             $ 0.001 $ 0.001      
Preferred stock, authorized amount | $           $ 25,000,000                    
Preferred dividend                         10.00%      
Preferred stock, shares outstanding         12,525             12,525 12,525      
Preferred stock, convertible, conversion price (in dollars per share) | $ / shares         $ 1,000             $ 1,000 $ 1,000      
Accumulated conversion value, conversion price (in dollars per share) | $ / shares           $ 2.50                    
Convertible Preferred Stock | On Or Before October 15, 2025                                
Subsidiary, Sale of Stock [Line Items]                                
Accumulated conversion value thereof           1.25                    
Convertible Preferred Stock | After October 15, 2025                                
Subsidiary, Sale of Stock [Line Items]                                
Accumulated conversion value thereof           3.00                    
Convertible Preferred Stock | Subsequent Event                                
Subsidiary, Sale of Stock [Line Items]                                
Conversion of stock, shares converted 1,319                              
Issuance of Series A Convertible Preferred Stock, net of issuance costs | $     $ 10,000,000                          
DDH LLC                                
Subsidiary, Sale of Stock [Line Items]                                
Noneconomic voting rights (as percent)                         100.00%      
Direct Digital Management LLC | Class A Common Stock                                
Subsidiary, Sale of Stock [Line Items]                                
Conversion of stock, shares converted                         1,292,500 0    
Number of shares of common stock (in shares)         1             1 1      
DDM | Class B Common Stock                                
Subsidiary, Sale of Stock [Line Items]                                
Number of shares of common stock (in shares)         9,575,500             9,575,500 9,575,500