Quarterly report pursuant to Section 13 or 15(d)

Nature of business and summary of significant accounting policies (Details)

v3.21.2
Nature of business and summary of significant accounting policies (Details)
3 Months Ended 9 Months Ended
Jul. 01, 2021
USD ($)
$ / shares
shares
Jun. 29, 2021
shares
Jun. 28, 2021
shares
May 28, 2021
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2021
USD ($)
shares
Sep. 30, 2020
USD ($)
Aug. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Subsidiary, Sale of Stock [Line Items]                    
Reverse stock split ratio       0.1667            
Stock issued in lieu of fractional shares, reverse stock split (in shares) | shares     1,081              
Share repurchase program, authorized amount                 $ 2,000,000  
Share repurchases (in shares) | shares             344,775      
Share repurchases         $ 1,274,000   $ 1,300,000      
Advertising costs         3,000,000 $ 1,800,000 7,300,000 $ 4,400,000    
Business credit card and credit card clearance operations                    
Subsidiary, Sale of Stock [Line Items]                    
Restricted cash         100,000   100,000     $ 100,000
Wintrust Credit Facility                    
Subsidiary, Sale of Stock [Line Items]                    
Restricted cash         $ 7,200,000   $ 7,200,000      
Redeemable Convertible Preferred Stock                    
Subsidiary, Sale of Stock [Line Items]                    
Shares issued upon conversion of notes (in shares) | shares   4,732,420                
IPO                    
Subsidiary, Sale of Stock [Line Items]                    
Number of shares sold (in shares) | shares 8,000,000                  
Offering price (in dollars per share) | $ / shares $ 5.00                  
Total net proceeds $ 36,200,000                  
Underwriting discounts and commissions 2,800,000                  
Offering costs $ 1,000,000                  
Shares issued upon conversion of preferred stock (in shares) | shares 5,764,533                  
Maximum                    
Subsidiary, Sale of Stock [Line Items]                    
Reverse stock split ratio       0.3333            
Minimum                    
Subsidiary, Sale of Stock [Line Items]                    
Reverse stock split ratio       0.10