| Document and Entity Information | Mar. 05, 2024 |
| Cover [Abstract] | |
| Entity Registrant Name | Fisker Inc./DE |
| Amendment Flag | false |
| Entity Central Index Key | 0001720990 |
| Current Fiscal Year End Date | --12-31 |
| Document Type | 8-K |
| Document Period End Date | Mar. 05, 2024 |
| Entity Incorporation State Country Code | DE |
| Entity File Number | 001-38625 |
| Entity Tax Identification Number | 82-3100340 |
| Entity Address, Address Line One | 1888 Rosecrans Avenue |
| Entity Address, City or Town | Manhattan Beach |
| Entity Address, State or Province | CA |
| Entity Address, Postal Zip Code | 90266 |
| City Area Code | (833) |
| Local Phone Number | 434-7537 |
| Written Communications | false |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Security 12b Title | Class A Common Stock, par value of $0.00001 per share |
| Trading Symbol | FSR |
| Security Exchange Name | NYSE |
| Entity Emerging Growth Company | false |
