v3.26.1
DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details)
$ / shares in Units, $ in Thousands
 1 Months Ended 2 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Jul. 02, 2026
USD ($)
$ / shares
shares
Jun. 18, 2026
May 12, 2026
Mar. 31, 2026
USD ($)
shares
Mar. 31, 2026
USD ($)
shares
Jun. 30, 2026
USD ($)
vendor
shares
Jun. 30, 2025
USD ($)
vendor
Jun. 30, 2026
USD ($)
vendor
pricing_model
shares
Jun. 30, 2025
USD ($)
vendor
Dec. 31, 2025
USD ($)
shares
Dec. 31, 2020
USD ($)
shares
Subsidiary, Sale of Stock [Line Items]                      
Reverse stock split (in shares)   0.5 0.0029762                
Cash and cash equivalents           $ 278,065 $ 251,421 $ 278,065 $ 251,421 $ 339,825  
Offering expenses               $ 5,585 $ 0    
Cash payments received       $ 19,900              
Issuance of common stock for options exercised (in shares) | shares               338,258      
Principal amount           7,100   $ 7,100   34,500  
Stock repurchased (in shares) | shares       387,327              
Interest receivable           $ 400   $ 400   $ 2,600  
Shares issued and pledged for repayment of notes (in shares) | shares           130,012   130,012   850,156  
Number of significant vendors | vendor           1 0 1 0    
Number of pricing models | pricing_model               2      
Deferred offering costs           $ 13,500   $ 13,500   $ 7,700  
Certain executives and key employees                      
Subsidiary, Sale of Stock [Line Items]                      
Promissory notes                     $ 38,600
RSUs                      
Subsidiary, Sale of Stock [Line Items]                      
Modified stock-based compensation expense       $ 600       $ 35,800      
Minimum                      
Subsidiary, Sale of Stock [Line Items]                      
Original stated interest rate                     0.41%
Maximum                      
Subsidiary, Sale of Stock [Line Items]                      
Original stated interest rate                     0.45%
Maturity date                     10 years
Conversion of 2020 Notes to common stock                      
Subsidiary, Sale of Stock [Line Items]                      
Issuance of common stock for exercise or conversion (in shares) | shares           12,648,586          
Conversion of 2021 Notes to common stock                      
Subsidiary, Sale of Stock [Line Items]                      
Issuance of common stock for exercise or conversion (in shares) | shares           27,326,950          
Early Exercise Of Promissory Notes | Certain executives and key employees                      
Subsidiary, Sale of Stock [Line Items]                      
Issuance of common stock for exercise or conversion (in shares) | shares                     932,001
Accounts receivable | Customer | Third-party PSP                      
Subsidiary, Sale of Stock [Line Items]                      
Concentration percent               71.70%   83.90%  
Accounts receivable | Customer | Uber                      
Subsidiary, Sale of Stock [Line Items]                      
Concentration percent               5.30%   6.70%  
Revenue | Customer | Uber                      
Subsidiary, Sale of Stock [Line Items]                      
Concentration percent           13.00% 14.90% 13.40% 14.80%    
Certain promissory note holders                      
Subsidiary, Sale of Stock [Line Items]                      
Cash payments received         $ 9,100            
Issuance of common stock for options exercised (in shares) | shares         166,125            
A promissory note holder                      
Subsidiary, Sale of Stock [Line Items]                      
Cash payments received       $ 900              
Issuance of common stock for options exercised (in shares) | shares       166,686              
Stock repurchased (in shares) | shares       23,266              
IPO | Subsequent Event                      
Subsidiary, Sale of Stock [Line Items]                      
Sale of stock (in shares) | shares 6,679,791                    
Sale of stock price per share (in dollars per shares) | $ / shares $ 25.00                    
Net proceeds $ 141,700                    
Underwriting discounts and commissions 11,700                    
Offering expenses $ 13,600                    
IPO | Selling Stockholders | Subsequent Event                      
Subsidiary, Sale of Stock [Line Items]                      
Sale of stock (in shares) | shares 276,731