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Document and Entity Information
Mar. 23, 2021
Document And Entity Information [Line Items]  
Entity Registrant Name MP Materials Corp. / DE
Amendment Flag false
Entity Central Index Key 0001801368
Document Type 8-K
Document Period End Date Mar. 23, 2021
Entity Incorporation State Country Code DE
Entity File Number 001-39277
Entity Tax Identification Number 84-4465489
Entity Address, Address Line One 6720 Via Austi Parkway
Entity Address, Address Line Two Suite 450
Entity Address, City or Town Las Vegas
Entity Address, State or Province NV
Entity Address, Postal Zip Code 89119
City Area Code (702)
Local Phone Number 844-6111
Written Communications false
Soliciting Material false
Pre Commencement Tender Offer false
Pre Commencement Issuer Tender Offer false
Entity Emerging Growth Company true
Entity Ex Transition Period false
Common Stock [Member]  
Document And Entity Information [Line Items]  
Security 12b Title Class A common stock, par value of $0.0001 per share
Trading Symbol MP
Security Exchange Name NYSE
Warrant [Member]  
Document And Entity Information [Line Items]  
Security 12b Title Warrants to purchase Class A Common Stock
Trading Symbol MPWS
Security Exchange Name NYSE