Annual report pursuant to Section 13 and 15(d)

Document and Entity Information

Document and Entity Information - USD ($)
1 Months Ended
Dec. 31, 2020
Mar. 29, 2021
Jun. 30, 2020
Document Information [Line Items]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Dec. 31, 2020    
Document Fiscal Year Focus 2020    
Document Fiscal Period Focus FY    
Entity Registrant Name GigCapital4, Inc.    
Entity Central Index Key 0001836981    
Current Fiscal Year End Date --12-31    
Entity Filer Category Non-accelerated Filer    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Small Business true    
Entity Emerging Growth Company true    
Entity Ex Transition Period false    
Entity Common Stock, Shares Outstanding   45,949,600  
Entity Shell Company true    
Entity File Number 001-40031    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 85-4164597    
Entity Address, Address Line One 1731 Embarcadero Rd.    
Entity Address, Address Line Two Suite 200    
Entity Address, City or Town Palo Alto    
Entity Address, State or Province CA    
Entity Address, Postal Zip Code 94303    
City Area Code (650)    
Local Phone Number 276-7040    
Document Transition Report false    
Entity Voluntary Filers No    
Entity Well-known Seasoned Issuer No    
Entity Public Float     $ 0
Document Annual Report true    
ICFR Auditor Attestation Flag false    
Document Information [Line Items]      
Title of 12(b) Security Units, each consisting of one share of common stock and one-third of one Redeemable Warrant    
Trading Symbol GIG.GU    
Security Exchange Name NASDAQ    
Common Stock      
Document Information [Line Items]      
Title of 12(b) Security Common stock, par value $0.0001 per share    
Trading Symbol GIG    
Security Exchange Name NASDAQ    
Document Information [Line Items]      
Title of 12(b) Security Redeemable Warrants, each full warrant exercisable for one share of common stock at an exercise price of $11.50 per share    
Trading Symbol GIG.GW    
Security Exchange Name NASDAQ