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Document and Entity Information
May 04, 2021
Entity Listings [Line Items]  
Document Type 8-K
Amendment Flag false
Document Period End Date May 04, 2021
Entity Registrant Name MP Materials Corp. / DE
Entity Incorporation, State or 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
Entity Central Index Key 0001801368
Common Stock [Member]  
Entity Listings [Line Items]  
Title of 12(b) Security Class A common stock, par value of $0.0001 per share
Trading Symbol MP
Security Exchange Name NYSE
Warrants to purchase Class A Common Stock [Member]  
Entity Listings [Line Items]  
Title of 12(b) Security Warrants to purchase Class A Common Stock
Trading Symbol MPWS
Security Exchange Name NYSE