v3.26.1
Stock-Based Compensation - Schedule of Valuation Assumptions of Non-Plan Co-Founder and Head of Blend Options (Details) - Stock Options - Tranche Two - Non-employee
1 Months Ended
Mar. 31, 2021
$ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Vested and exercisable (in dollars per share) $ 3.80
Fair value of common stock (in dollars per share) $ 18.00
Remaining contractual term (years) 14 years 9 months
Expected volatility 40.00%
Risk-free interest rate 1.71%
Expected dividend yield 0.00%