v3.21.1
Cover Page - USD ($)
5 Months Ended
Dec. 31, 2020
Mar. 29, 2021
Document Information [Line Items]    
Document Type 10-K  
Document Period End Date Dec. 31, 2020  
Amendment Flag false  
Document Fiscal Period Focus FY  
Document Fiscal Year Focus 2020  
Entity Current Reporting Status Yes  
Entity Filer Category Non-accelerated Filer  
Entity Registrant Name Genesis Park Acquisition Corp.  
Entity Interactive Data Current Yes  
Current Fiscal Year End Date --12-31  
Entity Central Index Key 0001819810  
Entity File Number 001-39733  
Entity Incorporation, State or Country Code E9  
Entity Tax Identification Number 98-1550429  
Entity Address, Address Line One 2000 Edwards Street  
Entity Address, Address Line Two Suite B  
Entity Address, City or Town Houston  
Entity Address, State or Province TX  
Entity Address, Postal Zip Code 77007  
City Area Code 713  
Local Phone Number 489-4650  
Document Annual Report true  
Entity Well-known Seasoned Issuer No  
Entity Voluntary Filers No  
Entity Shell Company true  
Entity Small Business true  
Entity Emerging Growth Company true  
Entity Ex Transition Period false  
Title of 12(b) Security Class A ordinary shares, par value $0.0001 per share  
Trading Symbol GNPK  
Security Exchange Name NYSE  
Entity Public Float $ 0  
ICFR Auditor Attestation Flag false  
Common Class A [Member]    
Document Information [Line Items]    
Entity Common Stock, Shares Outstanding   16,377,622
Common Class B [Member]    
Document Information [Line Items]    
Entity Common Stock, Shares Outstanding   4,094,406
Capital Units [Member]    
Document Information [Line Items]    
Title of 12(b) Security Units, each consisting of one Class A ordinary share and one-half of one redeemable warrant  
Trading Symbol GNPK. U  
Security Exchange Name NYSE  
Warrant [Member]    
Document Information [Line Items]    
Title of 12(b) Security Redeemable warrants, with each whole warrant exercisable for one Class A ordinary share at an exercise price of $11.50 per share  
Trading Symbol GNPK WS  
Security Exchange Name NYSE