Energous Corporation Quarterly report pursuant to Section 13 or 15(d)

Quarterly report pursuant to Section 13 or 15(d)

Stock Based Compensation - Equity Incentive Plan - Additional Information (Detail)

Stock Based Compensation - Equity Incentive Plan - Additional Information (Detail) - USD ($)		9 Months Ended
	Apr. 30, 2015	Sep. 30, 2023	Jun. 14, 2023	Jul. 20, 2022	Jun. 16, 2021	May 26, 2020	Dec. 28, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee contribution through payroll withholdings		$ 3,493
Employee Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, number of shares authorized for issuance			102,500
Common stock, capital shares reserved for future issuance	30,000		25,000
Common stock remain eligible to be issued		18,741
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%
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%
Share-based compensation arrangement by share-based payment award, terms of award		In April 2015, the Company’s Board approved the ESPP, under which 30,000 shares of common stock have been 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. Effective on June 14, 2023, the Company’s stockholders approved the amendment and restatement of the ESPP to increase the number of shares reserved for issuance through equity-based instruments thereunder by 25,000 shares, bringing to 102,500 the total number of shares approved for issuance under that plan. Under the ESPP, employees may designate an amount not less than 1% but not more than 10% of their annual compensation for the purchase of Company shares. An offering period shall be six months in duration commencing on or about January 1 and July 1 of each year. The exercise price of the option will be the lesser of 85% of the fair market 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.
2013 Equity Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, number of shares authorized for issuance			489,298
Common stock, capital shares reserved for future issuance			50,000
Common stock remain eligible to be issued		118,565
Non-Employee Equity Compensation Plan 2014 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, number of shares authorized for issuance						82,500
Common stock, capital shares reserved for future issuance						40,000
Common stock remain eligible to be issued		29,137
2015 Performance Share Unit Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, number of shares authorized for issuance					255,505
Common stock, capital shares reserved for future issuance					85,000
Common stock remain eligible to be issued		106,272
2017 Equity Inducement Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock, capital shares reserved for future issuance				100,000
Common stock remain eligible to be issued		48,834
2017 Equity Inducement Plan [Member] \| Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock, capital shares reserved for future issuance							30,000