Quarterly report pursuant to Section 13 or 15(d)

Cover Page

v3.20.2
Cover Page - shares
2 Months Ended
Sep. 30, 2020
Nov. 11, 2020
Document Information [Line Items]    
Document Type 10-Q  
Amendment Flag false  
Document Quarterly Report true  
Document Transition Report false  
Document Period End Date Sep. 30, 2020  
Document Fiscal Year Focus 2020  
Document Fiscal Period Focus Q3  
Current Fiscal Year End Date --12-31  
Entity Registrant Name Prime Impact Acquisition I  
Entity Central Index Key 0001819175  
Entity Incorporation, State or Country Code E9  
Entity Address, Country CA  
Title of 12(b) Security Class A ordinary share, par value $0.0001 per share  
Trading Symbol PIAI  
Security Exchange Name NYSE  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Non-accelerated Filer  
Entity Small Business true  
Entity Emerging Growth Company true  
Entity Ex Transition Period false  
Entity Shell Company true  
Capital Units [Member]    
Document Information [Line Items]    
Title of 12(b) Security Units, each consisting of one share of Class A ordinary shares, and one Warrant to acquire one-third Class A ordinary share  
Trading Symbol PIAI.U  
Security Exchange Name NYSE  
Warrant [Member]    
Document Information [Line Items]    
Title of 12(b) Security Warrants, each whole warrant exercisable for one Class A ordinary share at an exercise price of $11.50  
Trading Symbol PIAI.W  
Security Exchange Name NYSE  
Common Class A [Member]    
Document Information [Line Items]    
Entity Common Stock, Shares Outstanding   32,408,414
Common Class B [Member]    
Document Information [Line Items]    
Entity Common Stock, Shares Outstanding   8,102,103