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Stock-Based Compensation - Equity Incentive Plan - Additional Information (Details) - shares
 1 Months Ended 3 Months Ended
Apr. 30, 2015
Mar. 31, 2025
Dec. 31, 2024
Jun. 12, 2024
Mar. 31, 2024
Mar. 28, 2024
Jul. 20, 2022
Dec. 28, 2017
Stock-Based Compensation                
Common stock, capital shares reserved for future issuance   2,192,394     2,401,248      
RSUs                
Stock-Based Compensation                
Common stock, capital shares reserved for future issuance   439,416     102,179      
Options granted and outstanding   439,416 538,506          
Employee Stock Purchase Plan                
Stock-Based Compensation                
Common stock, capital shares reserved for future issuance 30,000     6,200        
Share-based compensation arrangement by share-based payment award, terms of award   In April 2015, the Board approved the Energous Corporation Employee Stock Purchase Plan (“ESPP”), under which 30,000 shares of common stock were reserved for purchase by the Company’s employees, subject to the approval by the Company’s stockholders. On May 21, 2015, the Company’s stockholders approved the ESPP. On June 12, 2024, the Company’s stockholders approved the amendment and restatement of the ESPP to increase the number of shares reserved for issuance under the ESPP by 6,200 shares. Under the ESPP, employees designated an amount not less than 1% but not more than 10% of their annual compensation for the purchase of Company shares. No more than 375 shares were purchased by an employee under the ESPP during an offering period. Excess contributions during an offering period were refunded to the employees. An offering period was six months in duration commencing on or about January 1 and July 1 of each year. The exercise price of options purchased under the ESPP was the lesser of 85% of the fair market value of the common stock on the first business day of the offering period and 85% of the fair market value of the common stock on the applicable exercise date.            
Lowest percentage of annual compensation to be utilized by an employee for purchase of shares under the plan 1.00%              
Highest percentage of annual compensation to be utilized by an employee for purchase of shares under the plan 10.00%              
Maximum number of shares permitted to purchase 375              
Vesting period 6 months              
Exercise price discount from fair value on offering date 85.00%              
Exercise price discount from fair value on exercise date 85.00% 15.00%            
2017 Equity Inducement Plan                
Stock-Based Compensation                
Common stock, capital shares reserved for future issuance         132,927   100,000 30,000
Common stock remain eligible to be issued           121,510    
2017 Equity Inducement Plan | RSUs                
Stock-Based Compensation                
Common stock remain eligible to be issued   46,784            
2024 Equity Incentive Plan                
Stock-Based Compensation                
Common stock, capital shares reserved for future issuance   320,069            
Common stock remain eligible to be issued   320,069            
Number of Shares Available for Grant       456,000        
2024 Equity Incentive Plan | RSUs                
Stock-Based Compensation                
Options granted and outstanding   392,632