| Cover | Apr. 11, 2024 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Apr. 11, 2024 |
| Entity File Number | 001-36379 |
| Entity Registrant Name | ENERGOUS CORPORATION |
| Entity Central Index Key | 0001575793 |
| Entity Tax Identification Number | 46-1318953 |
| Entity Incorporation, State or Country Code | DE |
| Entity Address, Address Line One | 3590 North First Street |
| Entity Address, Address Line Two | Suite 210 |
| Entity Address, City or Town | San Jose |
| Entity Address, State or Province | CA |
| Entity Address, Postal Zip Code | 95134 |
| City Area Code | 408 |
| Local Phone Number | 963-0200 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Common Stock, par value $0.00001 per share |
| Trading Symbol | WATT |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | false |
