Energous (WATT) 10-Q 9 Aug 19 2019 Q2 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	6 Months Ended
	Jun. 30, 2019	Aug. 02, 2019
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2019
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q2
Trading Symbol	WATT
Entity Registrant Name	Energous Corp
Entity Central Index Key	0001575793
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
Entity Small Business	true
Entity Shell Company	false
Entity Emerging Growth Company	false
Entity Common Stock, Shares Outstanding		30,637,520
Entity Current Reporting Status	Yes
Entity File Number	001-36379
Entity Tax Identification Number	461318953
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

Balance Sheets

Balance Sheets - USD ($)	Jun. 30, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 29,208,245	$ 20,106,485
Accounts receivable	47,500	44,550
Prepaid expenses and other current assets	486,360	637,708
Operating lease right-of-use assets	121,216
Total current assets	29,863,321	20,788,743
Property and equipment, net	914,964	1,219,016
Other assets	2,410	2,410
Total assets	30,780,695	22,010,169
Current liabilities:
Accounts payable	1,327,261	1,861,385
Accrued expenses	2,111,116	1,778,349
Operating lease liabilities	127,540
Total current liabilities	3,565,917	3,639,734
Commitments and contingencies
Stockholders’ equity:
Preferred Stock, $0.00001 par value, 10,000,000 shares authorized at June 30, 2019 and December 31, 2018; no shares issued or outstanding
Common Stock, $0.00001 par value, 50,000,000 shares authorized at June 30, 2019 and December 31, 2018; 30,603,534 and 26,526,303 shares issued and outstanding at June 30, 2019 and December 31, 2018, respectively.	306	265
Additional paid-in capital	272,779,507	243,111,741
Accumulated deficit	(245,565,035)	(224,741,571)
Total stockholders’ equity	27,214,778	18,370,435
Total liabilities and stockholders’ equity	$ 30,780,695	$ 22,010,169

Balance Sheets (Parenthetical)

Balance Sheets (Parenthetical) - $ / shares	Jun. 30, 2019	Dec. 31, 2018
Statement Of Financial Position [Abstract]
Preferred stock, par value	$ 0.00001	$ 0.00001
Preferred stock, shares authorized	10,000,000	10,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value	$ 0.00001	$ 0.00001
Common stock, shares authorized	50,000,000	50,000,000
Common stock, shares issued	30,603,534	26,526,303
Common stock, shares outstanding	30,603,534	26,526,303

Condensed Statements of Operati

Condensed Statements of Operations - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Income Statement [Abstract]
Revenue	$ 47,500	$ 205,773	$ 114,000	$ 230,773
Operating expenses:
Research and development	5,515,017	7,639,974	12,315,695	16,361,526
Sales and marketing	1,143,910	1,602,137	2,743,362	3,074,533
General and administrative	3,335,229	3,268,028	6,097,140	6,548,243
Total operating expenses	9,994,156	12,510,139	21,156,197	25,984,302
Loss from operations	(9,946,656)	(12,304,366)	(21,042,197)	(25,753,529)
Other income:
Interest income	142,660	5,995	218,733	11,701
Total other income	142,660	5,995	218,733	11,701
Net loss	$ (9,803,996)	$ (12,298,371)	$ (20,823,464)	$ (25,741,828)
Basic and diluted loss per common share	$ (0.32)	$ (0.48)	$ (0.71)	$ (1.03)
Weighted average shares outstanding, basic and diluted	30,445,438	25,479,861	29,199,225	25,042,529

Condensed Statement of Changes

Condensed Statement of Changes in Stockholders' Equity - USD ($)	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Deficit [Member]
Beginning balance at Dec. 31, 2017	$ 11,758,730	$ 225	$ 185,659,954	$ (173,901,449)
Beginning balance (in shares) at Dec. 31, 2017		22,584,588
Stock-based compensation - restricted stock units ("RSUs")	4,251,961		4,251,961
Stock-based compensation - employee stock purchase plan ("ESPP")	154,545		154,545
Stock-based compensation - performance share units ("PSUs")	202,702		202,702
Issuance of shares for RSUs		$ 3	(3)
Issuance of shares for RSUs (in shares)		341,936
Issuance of shares for PSUs		$ 1	(1)
Issuance of shares for PSUs (in shares)		80,098
Exercise of stock options	981,053	$ 2	981,051
Exercise of stock options (in shares)		179,732
Cashless exercise of warrants (in shares)		7,989
Proceeds from contributions to the ESPP	200,935		200,935
Issuance of shares in an at-the-market ("ATM") offering, net of issuance costs	38,846,815	$ 22	38,846,793
Issuance of shares in an at-the-market ("ATM") offering, net of issuance costs (in shares)		2,221,455
Net loss	(13,443,457)			(13,443,457)
Ending balance at Mar. 31, 2018	42,953,284	$ 253	230,297,937	(187,344,906)
Ending balance (in shares) at Mar. 31, 2018		25,415,798
Beginning balance at Dec. 31, 2017	11,758,730	$ 225	185,659,954	(173,901,449)
Beginning balance (in shares) at Dec. 31, 2017		22,584,588
Net loss	(25,741,828)
Ending balance at Jun. 30, 2018	35,169,843	$ 254	234,812,866	(199,643,277)
Ending balance (in shares) at Jun. 30, 2018		25,561,610
Beginning balance at Mar. 31, 2018	42,953,284	$ 253	230,297,937	(187,344,906)
Beginning balance (in shares) at Mar. 31, 2018		25,415,798
Stock-based compensation - restricted stock units ("RSUs")	3,884,725		3,884,725
Stock-based compensation - employee stock purchase plan ("ESPP")	253,201		253,201
Stock-based compensation - performance share units ("PSUs")	204,954		204,954
Issuance of shares for RSUs		$ 1	(1)
Issuance of shares for RSUs (in shares)		104,112
Exercise of stock options	2,171		2,171
Exercise of stock options (in shares)		872
Cashless exercise of warrants (in shares)		11,370
Proceeds from contributions to the ESPP	169,879		169,879
Proceeds from contributions to the ESPP (in shares)		29,458
Net loss	(12,298,371)			(12,298,371)
Ending balance at Jun. 30, 2018	35,169,843	$ 254	234,812,866	(199,643,277)
Ending balance (in shares) at Jun. 30, 2018		25,561,610
Beginning balance at Dec. 31, 2018	18,370,435	$ 265	243,111,741	(224,741,571)
Beginning balance (in shares) at Dec. 31, 2018		26,526,303
Stock-based compensation - restricted stock units ("RSUs")	3,083,567		3,083,567
Stock-based compensation - employee stock purchase plan ("ESPP")	87,825		87,825
Issuance of shares for RSUs		$ 4	(4)
Issuance of shares for RSUs (in shares)		434,522
Shares withheld for payroll tax on RSUs	(10,207)		(10,207)
Shares withheld for payroll tax on RSUs (in shares)		(1,329)
Shares withheld for payroll tax on performance share units ("PSUs")	(329,159)		(329,159)
Shares withheld for payroll tax on performance share units ("PSUs") (in shares)		(44,481)
Exercise of stock options	400,103	$ 1	400,102
Exercise of stock options (in shares)		80,201
Proceeds from contributions to the ESPP	173,167		173,167
Issuance of shares and warrants in private placements, net of issuance costs	23,319,156	$ 33	23,319,123
Issuance of shares and warrants in private placements, net of issuance costs (in shares)		3,333,333
Net loss	(11,019,468)			(11,019,468)
Ending balance at Mar. 31, 2019	34,075,419	$ 303	269,836,155	(235,761,039)
Ending balance (in shares) at Mar. 31, 2019		30,328,549
Beginning balance at Dec. 31, 2018	18,370,435	$ 265	243,111,741	(224,741,571)
Beginning balance (in shares) at Dec. 31, 2018		26,526,303
Net loss	(20,823,464)
Ending balance at Jun. 30, 2019	27,214,778	$ 306	272,779,507	(245,565,035)
Ending balance (in shares) at Jun. 30, 2019		30,603,534
Beginning balance at Mar. 31, 2019	34,075,419	$ 303	269,836,155	(235,761,039)
Beginning balance (in shares) at Mar. 31, 2019		30,328,549
Stock-based compensation - restricted stock units ("RSUs")	2,675,184		2,675,184
Stock-based compensation - employee stock purchase plan ("ESPP")	122,749		122,749
Issuance of shares for RSUs		$ 2	(2)
Issuance of shares for RSUs (in shares)		189,220
Proceeds from contributions to the ESPP	145,422	$ 1	145,421
Proceeds from contributions to the ESPP (in shares)		85,765
Net loss	(9,803,996)			(9,803,996)
Ending balance at Jun. 30, 2019	$ 27,214,778	$ 306	$ 272,779,507	$ (245,565,035)
Ending balance (in shares) at Jun. 30, 2019		30,603,534

Condensed Statement of Change_2

Condensed Statement of Changes in Stockholders' Equity (Parenthetical) - USD ($)	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Statement Of Stockholders Equity [Abstract]
Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs	$ 1,680,844	$ 1,153,715

Condensed Statements of Cash Fl

Condensed Statements of Cash Flows - USD ($)	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Cash flows from operating activities:
Net loss	$ (20,823,464)	$ (25,741,828)
Adjustments to reconcile net loss to Net cash used in operating activities:
Depreciation and amortization	476,863	574,815
Stock based compensation	5,969,325	8,952,088
Amortization of operating lease right-of-use assets	293,210
Amortization of prepaid rent from stock issuance to landlord		40,392
Changes in operating assets and liabilities:
Accounts receivable	(2,950)	(205,773)
Prepaid expenses and other current assets	94,681	436,360
Accounts payable	(534,124)	361,302
Accrued expenses	332,767	211,518
Operating lease liabilities	(230,219)
Net cash used in operating activities	(14,423,911)	(15,371,126)
Cash flows from investing activities:
Purchases of property and equipment	(172,811)	(548,800)
Net cash used in investing activities	(172,811)	(548,800)
Cash flows from financing activities:
Net proceeds from the sales of common stock	23,319,156	38,846,815
Proceeds from the exercise of stock options	400,103	983,224
Proceeds from contributions to employee stock purchase plan	318,589	370,814
Net cash provided by financing activities	23,698,482	40,200,853
Net increase in cash and cash equivalents	9,101,760	24,280,927
Cash and cash equivalents – beginning	20,106,485	12,795,254
Cash and cash equivalents – ending	29,208,245	37,076,181
Restricted Stock Units (RSUs) [Member]
Cash flows from financing activities:
Shares repurchased for tax withholdings on vesting	(10,207)
Supplemental disclosure of non-cash financing activities:
Common stock issued	6	4
Performance Shares [Member]
Cash flows from financing activities:
Shares repurchased for tax withholdings on vesting	$ (329,159)
Supplemental disclosure of non-cash financing activities:
Common stock issued		$ 1

Business Organization, Nature o

Business Organization, Nature of Operations	6 Months Ended
	Jun. 30, 2019
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Business Organization, Nature of Operations	Note 1 - Business Organization, Nature of Operations Energous Corporation (the “Company”) was incorporated in Delaware on October 30, 2012. The Company has developed its WattUp® technology, consisting of proprietary semiconductor chipsets, software, hardware designs and antennas, that enables radio frequency (“RF”) based charging for electronic devices, providing wire-free contact and non-contact charging solutions, with the potential to enable charging with mobility. The Company believes its proprietary WattUp technology can be utilized in consumer electronics such as wearables, hearing aids, earbuds, Bluetooth headsets, Internet of Things (“IoT”) devices, smartphones, tablets, e-book readers, keyboards, mice, remote controls, rechargeable lights, cylindrical batteries, medical devices and other devices with charging requirements that would otherwise require battery replacement or wired power connection.

Liquidity and Management Plans

Liquidity and Management Plans	6 Months Ended
	Jun. 30, 2019
Liquidity And Management Plan Disclosure [Abstract]
Liquidity and Management Plans	Note 2 – Liquidity and Management Plans During the three and six months ended June 30, 2019, the Company recorded revenue of $47,500 and $114,000, respectively, and during the three and six months ended June 30, 2018, the Company recorded revenue of $205,773 and $230,773, respectively. During the three and six months ended June 30, 2019, the Company recorded net losses of $9,803,996 and $20,823,464, respectively, and during the three and six months ended June 30, 2018, the Company recorded net losses of $12,298,371 and $25,741,828, respectively. Net cash used in operating activities was $14,423,911 and $15,371,126 for the six months ended June 30, 2019 and 2018, respectively. The Company is currently meeting its liquidity requirements through the proceeds of securities offerings that raised net proceeds of $23,319,156 in March 2019 and $38,846,815 in January 2018, along with payments received under product development projects. As of June 30, 2019, the Company had cash on hand of $29,208,245. The Company expects that cash on hand as of June 30, 2019, together with anticipated revenues, will be sufficient to fund the Company’s operations into the third quarter of 2020. Research and development of new technologies is by its nature unpredictable. Although the Company intends to continue its research and development activities, there can be no assurance that its available resources and business operations will generate revenues sufficient to sustain operations. Accordingly, the Company will likely pursue additional financing, which could include offerings of equity or debt securities, bank financings, commercial agreements with customers or strategic partners, and other alternatives, depending upon market conditions. There is no assurance that such financing would be available on terms that the Company would find acceptable, or at all. The market for products using the Company’s technology is broad and evolving, but remains nascent and unproven, so the Company’s success is dependent upon many factors, including customer acceptance of our existing products, technical feasibility of future products, regulatory approval, competition and global market fluctuations.

Summary of Significant Accounti

Summary of Significant Accounting Policies	6 Months Ended
	Jun. 30, 2019
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Note 3 – Summary of Significant Accounting Policies Basis of Presentation The accompanying financial statements are presented in U.S. dollars and have been prepared in accordance with accounting principles generally accepted in the United States of America (“US GAAP”), and pursuant to the accounting and disclosure rules and regulations of the U.S. Securities and Exchange Commission (“SEC”). These unaudited condensed interim financial statements should be read in conjunction with the audited financial statements and notes thereto for the fiscal year ended December 31, 2018 included in the Company's Annual Report on Form 10-K for the fiscal year ended December 31, 2018, filed with the SEC on February 28, 2019. The accounting policies used in preparing these unaudited condensed interim financial statements are consistent with those described in the Company’s December 31, 2018 audited financial statements . Note 3 – Summary of Significant Accounting Policies, continued Use of Estimates The preparation of financial statements in conformity with US GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and the disclosure of contingent liabilities at the date of the financial statements as well as the reported expenses during the reporting periods. The Company’s significant estimates and assumptions include the valuation of stock-based compensation instruments, recognition of revenue, the useful lives of long-lived assets, and income tax expense. Some of these judgments can be subjective and complex, and, consequently, actual results may differ from these estimates. Although the Company believes that its estimates and assumptions are reasonable, they are based upon information available at the time the estimates and assumptions were made. Actual results could differ from those estimates. Cash and Cash Equivalents The Company considers all short-term, highly liquid investments with an original maturity at the date of purchase of three months or less to be cash equivalents. The Company maintains cash balances that may be uninsured or in deposit accounts that exceed Federal Deposit Insurance Corporation limits. The Company maintains its cash deposits with major financial institutions. Revenue Recognition On January 1, 2018, the Company adopted Accounting Standards Update No. 2014-09, "Revenue from Contracts with Customers" (Topic 606), which is described below in Recent Accounting Pronouncements. In accordance with Topic 606, the Company recognizes revenue using the following five-step approach: 1. Identify the contract with a customer. 2. Identify the performance obligations in the contract. 3. Determine the transaction price of the contract. 4. Allocate the transaction price to the performance obligations in the contract. 5. Recognize revenue when the performance obligations are met or delivered. The Company records revenue associated with product development projects that it enters into with certain customers. In general, these development projects are complex, and the Company does not have certainty about its ability to achieve the project milestones. The achievement of a milestone is dependent on the Company’s performance obligation and requires acceptance by the customer. The Company recognizes revenue based on when the performance obligation is met. However, the Company does not recognize revenue in excess of that payable upon achievement of an accepted milestone, as there would be uncertainty of payment for work that has not been accepted. The payment associated with achieving the performance obligation is generally commensurate with the Company’s effort or the value of the deliverable and is nonrefundable. The Company records the expenses related to these projects in research and development expense, in the periods such expenses were incurred. The Company records royalty revenue from its manufacturing partner, Dialog, based on shipments from Dialog to its customers. Currently, other than royalty revenue from Dialog, the Company’s other revenue source is product development projects. Research and Development Research and development expenses are charged to operations as incurred. For internally developed patents, all patent application costs are expensed as incurred as research and development expense. Patent application costs, which are generally legal costs, are expensed as research and development costs until such time as the future economic benefits of such patents become more certain. The Company incurred research and development costs of $5,515,017 and $7,639,974 for the three months ended June 30, 2019 and 2018, respectively, and the Company incurred research and development costs of $12,315,695 and $16,361,526 for the six months ended June 30, 2019 and 2018, respectively. Note 3 – Summary of Significant Accounting Policies, continued Stock-Based Compensation The Company accounts for equity instruments issued to employees, board members and contractors in accordance with accounting guidance that requires awards to be recorded at their fair value on the date of grant and are amortized over the vesting period of the award. The Company recognizes compensation costs on a straight-line basis over the requisite service period of the award, which is typically the vesting term of the equity instrument issued. Under the Energous Corporation Employee Stock Purchase Plan (“ESPP”), employees may purchase a limited number of shares of the Company’s common stock at a 15% discount from the lower of the closing market prices measured on the first and last days of each half-year period. The Company recognizes compensation expense for the fair value of the purchase options, as measured on the grant date. Income Taxes Tax benefits are recognized only for tax positions that are more likely than not to be sustained upon examination by tax authorities. The amount recognized is measured as the largest amount of benefit that is greater than 50 percent likely to be realized upon settlement. A liability for “unrecognized tax benefits” is recorded for any tax benefits claimed in the Company’s tax returns that do not meet these recognition and measurement standards. As of June 30, 2019, no liability for unrecognized tax benefits was required to be reported. The Company’s policy is to record interest and penalties on uncertain tax positions as a component of income tax expense. No interest or penalties were recorded during the three or six months ended June 30, 2019 and 2018. Net Loss Per Common Share Basic net loss per share is computed by dividing net loss available to common stockholders by the weighted average number of shares of common stock outstanding during the period. Diluted earnings per share is computed using the weighted average number of common shares and, if dilutive, potential common shares outstanding during the period. Potential common shares consist of the incremental common shares issuable upon the exercise of stock options and warrants (using the treasury stock method), the vesting of restricted stock units (“RSUs”), performance stock units (“PSUs”) and the shares issuable from the enrollment of employees in the ESPP. The computation of diluted loss per share excludes potentially dilutive securities of 7,228,185 and 7,403,916 for the three months ended June 30, 2019 and 2018, respectively, and 7,228,185 and 7,403,916 for the six months ended June 30, 2019 and 2018, respectively, because their inclusion would be anti-dilutive. Potentially dilutive securities outlined in the table below have been excluded from the computation of diluted net loss per share because the effect of their inclusion would have been anti-dilutive. For the Three Months Ended June 30, For the Six Months Ended June 30, 2019 2018 2019 2018 Warrant issued to private investors 4,702,354 3,035,688 4,702,354 3,035,688 Options to purchase common stock 576,293 856,635 576,293 856,635 RSUs 1,949,538 2,640,034 1,949,538 2,640,034 PSUs - 871,559 - 871,559 Total potentially dilutive securities 7,228,185 7,403,916 7,228,185 7,403,916 Note 3 – Summary of Significant Accounting Policies, continued Leases As of January 1, 2019, the Company determines if an arrangement is a lease at the inception of the arrangement. The Company applies the short-term lease recognition exemption and recognizes lease payments in profit or loss at lease commencement for facility or equipment leases that have a lease term of 12 months or less and do not include a purchase option whose exercise is reasonably certain. Operating leases are included in operating lease right-of-use (ROU) assets and operating lease liabilities. ROU assets represent the right to use an underlying asset for the lease term, and lease liabilities represent the obligation to make lease payments arising from the lease. Operating lease ROU assets and liabilities are measured and recorded at the later of the adoption date, January 1, 2019, or the service commencement date based on the present value of lease payments over the lease term. The Company uses the implicit interest rate when readily determinable; however, most leases do not establish an implicit rate, so the Company uses an estimate of the incremental borrowing rate based on the information available at the time of measurement. Lease expense for lease payments is recognized on a straight-line basis over the lease term. See Note 4 – Commitments and Contingencies, Operating Leases Recent Accounting Pronouncements In January 2016, the FASB issued ASU No. 2016-02, “Leases (Topic 842)”. This standard requires that a lessee recognize the assets and liabilities that arise from operating leases. A lessee should recognize in the statement of In November 2016, the FASB issued ASU No. 2016-18, “Statement of Cash Flows (230) – Restricted Cash.” ASU No. 2016-18 requires an entity to include amounts described as restricted cash and restricted cash equivalents with cash and cash equivalents when reconciling the beginning-of-period and end-of-period total amounts shown on the statement of cash flows. It is effective for annual reporting periods beginning after December 15, 2018. The Company has adopted ASU 2016-18 and its adoption had no material impact on its financial statements. In July 2017, the FASB issued a two-part ASU No. 2017-11, I. Accounting for Certain Financial Instruments with Down Round Features and II. Replacement of the Indefinite Deferral for Mandatorily Redeemable Financial Instruments of Certain Nonpublic Entities and Certain Mandatorily Redeemable Noncontrolling Interests with a Scope Exception. ASU 2017-11 amends guidance in FASB ASC 260, Earnings Per Share, FASB ASC 480, Distinguishing Liabilities from Equity, and FASB ASC 815, Derivatives and Hedging. The amendments in Part I of ASU 2017-11 change the classification analysis of certain equity-linked financial instruments (or embedded features) with down round features. The amendments in Part II of ASU 2017-11 re-characterize the indefinite deferral of certain provisions of Topic 480 that now are presented as pending content in the Codification, to a scope exception. Those amendments do not have an accounting effect. ASU 2017-11 is effective for public business entities for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2018. The Company has adopted ASU 2017-11 and its adoption had no material impact on its financial statements. Note 3 – Summary of Significant Accounting Policies, continued Recent Accounting Pronouncements, continued In June 2018, the FASB issued ASU No. 2018-07, “Compensation – Stock Compensation (Topic 718): Improvements to Nonemployee Share-based Payment Accounting.” ASU 2018-07 aligns accounting for share-based payments issued to nonemployees to that of employees under the existing guidance of Topic 718, with certain exceptions. This update supersedes previous guidance for equity-based payments to nonemployees under Subtopic 505-50, “Equity – Equity-based Payments to Nonemployees.” It is effective for annual reporting periods beginning after December 15, 2018. The Company adopted ASU 2018-07 and its adoption had no material impact on its financial statements. Management’s Evaluation of Subsequent Events The Company evaluates events that have occurred after the balance sheet date of June 30, 2019, through the date which the financial statements are issued. Based upon the review, the Company did not identify any subsequent events that would have required adjustment or disclosure in the financial statements.

Commitments and Contingencies

Commitments and Contingencies	6 Months Ended
	Jun. 30, 2019
Commitments And Contingencies Disclosure [Abstract]
Commitments and Contingencies	Note 4 – Commitments and Contingencies Operating Leases On September 10, 2014, the Company entered into a Lease Agreement with Balzer Family Investments, L.P. (the “Landlord”) related to space located at Northpointe Business Center, 3590 North First Street, San Jose, California. The initial term of the lease is 60 months, with initial monthly base rent of $36,720 and the lease is subject to certain annual escalations as defined in the agreement. On February 26, 2015, the Company entered into a sub-lease agreement for space in its San Jose location on the first floor and was amended on August 25, 2015 to include additional space. The agreement had a term which expired on June 30, 2019. On March 13, 2019, the Company amended its Lease Agreement with the Landlord which combined both the first-floor space and the second-floor space for the final three months of the original lease term for the second floor, which expires on September 30, 2019. Effective July 1, 2019 through September 30, 2019, the new monthly rent payment will be $48,372. A lease renewal agreement was signed on July 1, 2019 for the first and second floor spaces of the San Jose property. Additional information is provided in Note 9 – Subsequent Events. On May 31, 2017, the Company renewed a lease agreement for the Company’s space in Costa Mesa, California. The agreement has a term that expires on September 30, 2019 with initial monthly rent of $9,040 and is subject to certain annual escalations as defined in the agreement. On July 15, 2019, the Company signed an agreement for the renewal of the property in Costa Mesa, California. Additional information is provided in Note 9 – Subsequent Events In February 2016, the FASB issued its final standard on lease accounting, ASU No. 2016-02, “Leases (Topic 842),” which superseded Topic 840, “Leases,” which was further modified in ASU No. 2018-10, “Codification Improvements” to clarify the implementation guidance. The new accounting standard was effective for the Company beginning on January 1, 2019 and required the recognition on the balance sheet of right-of-use assets and lease liabilities. The Company elected the optional transition method and adopted the new guidance on January 1, 2019 on a modified retrospective basis with no restatement of prior period amounts. The Company’s adoption of the new standard resulted in the recognition of right-of-use assets of $414,426 and operating lease liabilities of $485,747, with no material cumulative effect adjustment to equity as of the date of adoption. As of June 30, 2019, the Company’s remaining weighted average operating lease terms were approximately 3 months. The weighted average discount rate used to measure the outstanding operating lease liabilities was 10% as of June 30, 2019. A reconciliation of undiscounted cash flows to lease liabilities recognized as of June 30, 2019 is as follows: Amount (unaudited) 2019 129,566 Present value discount (10% weighted average) (2,026 ) Total operating lease liabilities $ 127,540 Note 4 – Commitments and Contingencies, continued Hosted Design Solution Agreement In June 2015, the Company entered into a three-year agreement to license electronic design automation software in a hosted environment. Pursuant to the agreement, under which services began in July 2015, the Company is required to remit quarterly payments in the amount of approximately $101,000 with the last payment due in March 2018. In December 2015, the agreement was amended to update and redefine the hosted hardware and software licensed by the Company and the quarterly payments increased to approximately $198,000. In July 2018, the Company renewed the three-year agreement, and the Company is required to remit quarterly payments in the amount of approximately $218,000, with the last payment due in March 2021. Litigations, Claims, and Assessments The Company is from time to time involved in various disputes, claims, liens and litigation matters arising in the normal course of business. While the outcome of these disputes, claims, liens and litigation matters cannot be predicted with certainty, after consulting with legal counsel, management does not believe that the outcome of these matters will have a material adverse effect on the Company's combined financial position, results of operations or cash flows. MBO Bonus Plan On March 15, 2018, the Company’s Board of Directors (“Board”), on the recommendation of the Board’s Compensation Committee (“Compensation Committee”), approved the Energous Corporation MBO Bonus Plan (“Bonus Plan”) for executive officers of the Company. To be eligible to receive a bonus under the Bonus Plan, an executive officer must be continuously employed throughout the applicable performance period, and in good standing, and achieve the performance objectives selected by the Compensation Committee. Under the Bonus Plan, the Compensation Committee is responsible for selecting the amounts of potential bonuses for executive officers, the performance metrics used to determine whether any such bonuses will be paid and determining whether those performance metrics have been achieved. During the three months ended June 30, 2019, the Company accrued $209,675 in expense under the Bonus Plan, which will be paid during the third quarter of 2019. During the three months ended June 30, 2018, the Company accrued $492,818 in expense, which was paid during the third quarter of 2018. During the six months ended June 30, 2019 and 2018, the Company incurred $524,188 and $760,114 in expense under the Bonus Plan. Severance and Change in Control Agreement On March 15, 2018, the Compensation Committee approved a form of Severance and Change in Control Agreement (“Severance Under the Severance Agreement, if an Executive is terminated in a qualifying termination, the Company agrees to pay the Executive six to 12 months of that Executive’s monthly base salary and bonuses, in under some circumstances. If the Executive elects continued coverage under the Consolidated Omnibus Budget Reconciliation Act of 1985, as amended (“COBRA”) the Company agrees to pay the full amount of Executive’s premiums under the Company’s health, dental and vision plans, including coverage for the Executive’s eligible dependents, for the six to 12 month period following the Executive’s termination. Note 4 – Commitments and Contingencies, continued Employee Agreement – Stephen Rizzone On April 3, 2015, the Company entered into an Amended and Restated Executive Employment Agreement with Stephen R. Rizzone, the Company’s President and Chief Executive Officer (“Employment Agreement”). The Employment Agreement was effective as of January 1, 2015, had an initial term of four years and renews automatically each year after the initial term. The Employment Agreement provides for an annual base salary of $365,000, and Mr. Rizzone is eligible to receive quarterly cash bonuses from the Bonus Plan with a total target amount equal to 100% of his base salary based upon achievement of performance-based objectives established by the Board. Mr. Rizzone is also eligible to receive all customary and usual benefits generally available to senior executives of the Company. Strategic Alliance Agreement In November 2016, the Company and Dialog Semiconductor plc (“Dialog”), a related party (see Note 7—Related Party Transactions), entered into a Strategic Alliance Agreement (“Alliance Agreement”) for the manufacture, distribution and commercialization of products incorporating the Company’s wire-free charging technology (“Licensed Products”). Pursuant to the terms of the Alliance Agreement, the Company agreed to engage Dialog as the exclusive supplier of the Licensed Products for specified fields of use, subject to certain exceptions (the “Company Exclusivity Requirement”). Dialog agreed to not distribute, sell or work with any third party to develop any competing products without the Company’s approval (the “Dialog Exclusivity Requirement”). In addition, both parties agreed on a revenue sharing arrangement and will collaborate on the commercialization of Licensed Products based on a mutually-agreed upon plan. Each party will retain all of its intellectual property. The Alliance Agreement has an initial term of seven years and will automatically renew annually thereafter unless terminated by either party upon 180 days’ prior written notice. The Company may terminate the Alliance Agreement at any time after the third anniversary of the Agreement upon 180 days’ prior written notice to Dialog, or if Dialog breaches certain exclusivity obligations. Dialog may terminate the Alliance Agreement if sales of Licensed Products do not meet specified targets. The Company Exclusivity Requirement will terminate upon the earlier of January 1, 2021 or the occurrence of certain events relating to the Company’s pre-existing exclusivity obligations. The Dialog Exclusivity Requirement will terminate if no Licensed Products have received the necessary Federal Communications Commission approvals within specified timeframes.

Stockholders' Equity

Stockholders' Equity	6 Months Ended
	Jun. 30, 2019
Equity [Abstract]
Stockholders' Equity	Note 5 – Stockholders’ Equity Authorized Capital The holders of the Company’s common stock are entitled to one vote per share. Holders of common stock are entitled to receive ratably such dividends, if any, as may be declared by the Board out of legally available funds. Upon the liquidation, dissolution or winding up of the Company, holders of common stock are entitled to share ratably in all assets of the Company that are legally available for distribution. Note 5 – Stockholders’ Equity, continued Public Offerings Pursuant to a shelf registration statement on Form S-3 filed on April 24, 2015, in January 2018, the Company raised $38,846,815 (net of $1,153,715 in underwriter’s discount and issuance costs) from the sale of stock in an “at-the-market” offering of its common stock. On August 9, 2018, the Company filed a shelf registration statement on Form S-3, which became effective on August 17, 2018. This shelf registration statement allows the Company to sell, from time to time, any combination of debt or equity securities described in the registration statement up to aggregate proceeds of $75,000,000. Pursuant to this registration statement, in March 2019 the Company raised $23,319,156 (net of $1,680,844 in issuance costs) from an offering of shares of its common stock and warrants to purchase 1,666,666 shares of common stock at an exercise price of $10.00 per share.

Stock Based Compensation

Stock Based Compensation	6 Months Ended
	Jun. 30, 2019
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Stock Based Compensation	Note 6 – Stock-Based Compensation Equity Incentive Plans 2013 Equity Incentive Plan Effective on May 16, 2018, the Company’s stockholders approved the amendment and restatement of the 2013 Equity Incentive Plan to increase the number of shares reserved for issuance through equity-based instruments thereunder by 1,600,000 shares, bringing to 6,085,967 the total number of shares approved for issuance under that plan. As of June 30, 2019, 1,628,225 shares of common stock remain available to be issued under the 2013 Equity Incentive Plan. 2014 Non-Employee Equity Compensation Plan Effective on May 16, 2018, the Company’s stockholders approved the amendment and restatement of the 2014 Equity Incentive Plan to increase the number of shares reserved for issuance through equity-based instruments thereunder by 250,000 shares, bringing to 850,000 the total number of shares approved for issuance under that plan. As of June 30, 2019, 208,842 shares of common stock remain available to be issued through equity-based instruments under the 2014 Non-Employee Equity Compensation Plan. 2015 Performance Share Unit Plan Effective on May 16, 2018, the Company’s stockholders approved the amendment and restatement of the 2015 Performance Share Unit Plan to increase the number of shares reserved for issuance through equity-based instruments thereunder by 1,400,000 shares, bringing to 2,710,104 the total number of shares approved for issuance under that plan. As of June 30, 2019, 1,431,951 shares of common stock remain available to be issued through equity-based instruments under the 2015 Performance Share Unit Plan. 2017 Equity Inducement Plan On December 28, 2017, the Board approved the 2017 Equity Inducement Plan. Under the plan, the Board reserved 600,000 shares of common stock for the grant of RSUs. These grants will be administered by a committee of the Board or the Board acting as a committee. These awards will be granted to individuals who (a) are being hired as an employee by the Company or any subsidiary and such award is a material inducement to such person being hired; (b) are being rehired as an employee following a bona fide period of interruption of employment with the Company or any subsidiary; or (c) will become an employee of the Company or any subsidiary in connection with a merger or acquisition. As of June 30, 2019, 308,469 shares of common stock remain available to be issued through equity-based instruments under the 2017 Equity Inducement Plan. Note 6 – Stock-Based Compensation, continued Equity Incentive Plans, continued Employee Stock Purchase Plan In April 2015, the Company’s Board approved the ESPP, under which 600,000 shares of common stock were reserved for purchase by the Company’s employees, and on May 21, 2015, the Company’s stockholders approved the ESPP. 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. No more than 7,500 shares may be purchased by an employee under the ESPP during an offering period. 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 purchase 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. As of June 30, 2019, 257,988 shares of common stock remain available to be issued under the ESPP. As of June 30, 2019, employees have contributed $318,589 through payroll withholdings to the ESPP for the current offering period. Shares will be deemed delivered on June 30, 2019 for the current offering period. Stock Option Activity The following is a summary of the Company’s stock option activity during the six months ended June 30, 2019: Number of Options Weighted Average Exercise Price Weighted Average Remaining Life In Years Intrinsic Value Outstanding at January 1, 2019 656,494 $ 5.57 4.6 $ 252,887 Granted – – – – Exercised (80,201 ) 4.99 – – Forfeited – – – – Outstanding at June 30, 2019 576,293 $ 5.65 4.8 $ 104,601 Exercisable at January 1, 2019 656,494 $ 5.57 4.6 $ 252,887 Vested – – – – Exercised (80,201 ) 4.99 – – Forfeited – – – – Exercisable at June 30, 2019 576,293 $ 5.65 4.8 $ 104,601 As of June 30, 2019, the unamortized value of options was $0. Note 6 – Stock Based Compensation, continued Restricted Stock Units (“RSUs”) During the six months ended June 30, 2019, the Compensation Committee granted various directors and consultants RSUs covering 157,987 shares of common stock under the 2014 Non-Employee Equity Compensation Plan. The awards vest over terms from one to three years. During the six months ended June 30, 2019, the Compensation Committee granted various employees RSUs covering 311,750 shares of common stock under the 2013 Equity Incentive Plan. The awards vest over terms ranging from one to four years. During the six months ended June 30, 2019, the Compensation Committee granted employees RSUs covering 25,500 shares of common stock under the 2017 Equity Inducement Plan. The awards vest over four years. As of t h un am or ti ze v a l u o t h R a $ T h un am or ti ze am oun il b e xp e n e ov e weighted average p e r i o o 1.9 y ea r Total Weighted Average Grant Date Fair Value Outstanding at January 1, 2019 2,469,174 $ 15.07 RSUs granted 495,237 $ 6.15 RSUs forfeited (391,130 ) $ 14.99 RSUs vested (623,743 ) $ 14.94 Outstanding at June 30, 2019 1,949,538 $ 12.86 Performance Share Units (“PSUs”) Performance share units (“PSUs”) are grants that vest upon the achievement of certain performance goals. The performance goals are related to the Company’s market capitalization or market price of the common stock. Amortization for all PSU awards was $0 and $204,954 for the three months ended June 30, 2019 and 2018, respectively, and $0 and $407,656 for the six months ended June 30, 2019 and 2018, respectively. At June 30, 2019, all PSUs had either vested or expired and were no longer outstanding. Employee Stock Purchase Plan (“ESPP”) The recently completed offering period under the ESPP was January 1, 2019 through June 30, 2019. During the year ended December 31, 2018, there were two offering periods for the ESPP. The first offering period started on January 1, 2018 and concluded on June 30, 2018. The second offering period started on July 1, 2018 and concluded on December 31, 2018. The weighted-average grant-date fair value of the purchase option for each designated share purchased under this plan was approximately $2.43 and $13.84 for the six months ended June 30, 2019 and 2018, respectively, which represents the fair value of the option, consisting of three main components: (i) the value of the discount on the enrollment date, (ii) the proportionate value of the call option for 85% of the stock and (iii) the proportionate value of the put option for 15% of the stock. The Company recognized compensation expense for the plan of $122,749 and $253,201 for the three months ended June 30, 2019 and 2018, respectively, and $210,574 and $407,746 for the six months ended June 30, 2019 and 2018, respectively. Note 6 – Stock Based Compensation, continued Employee Stock Purchase Plan (“ESPP”), continued The Company estimated the fair value of ESPP purchase options granted during the six months ended June 30, 2019 and 2018 using the Black-Scholes option pricing model. The fair values of stock options granted were estimated using the following assumptions: Six Months Ended June 30, 2019 Six Months Ended June 30, 2018 Stock price $ 5.79 $ 22.34 Dividend yield 0 % 0 % Expected volatility 96 % 177 % Risk-free interest rate 2.51 % 1.61 % Expected life 6 months 6 months Stock-Based Compensation Expense The following tables summarize total stock-based compensation costs recognized for the three and six months ended June 30, 2019 and 2018: Three Months Ended June 30, Six Months Ended June 30, 2019 2018 2019 2018 RSUs 2,675,184 $ 3,884,725 5,758,751 $ 8,136,686 PSUs – 204,954 – 407,656 ESPP 122,749 253,201 210,574 407,746 Total $ 2,797,933 $ 4,342,880 $ 5,969,325 $ 8,952,088 The total amount of stock-based compensation was reflected within the statements of operations as: Three Months Ended June 30, Six Months Ended June 30, 2019 2018 2019 2018 Research and development $ 1,361,225 $ 2,483,693 $ 3,017,778 $ 5,542,223 Sales and marketing 343,945 388,533 720,993 669,891 General and administrative 1,092,763 1,470,654 2,230,554 2,739,974 Total $ 2,797,933 $ 4,342,880 $ 5,969,325 $ 8,952,088

Related Party Transactions

Related Party Transactions	6 Months Ended
	Jun. 30, 2019
Related Party Transactions [Abstract]
Related Party Transactions	Note 7 – Related Party Transactions In November 2016, the Company and Dialog entered into an alliance agreement for the manufacture, distribution and commercialization of products incorporating the Company’s wire-free charging technology (See Note 4 – Commitments and Contingencies, Strategic Alliance Agreement

Customer Concentrations

Customer Concentrations	6 Months Ended
	Jun. 30, 2019
Risks And Uncertainties [Abstract]
Customer Concentrations	Note 8 – Customer Concentrations Two customers accounted for approximately 95% of the Company’s revenue for the three months ended June 30, 2019 and one customer accounted for approximately 97% of the Company’s revenue for the three months ended June 30, 2018. Three customers accounted for approximately 75% of the Company’s revenue for the six months ended June 30, 2019 and one customer accounted for approximately 97% of the Company’s revenue for the six months ended June 30, 2018. Two customers accounted for approximately 95% of the accounts receivable balance as of June 30, 2019. Three customers accounted for approximately 86% of the accounts receivable balance as of December 31, 2018.

Subsequent Events

Subsequent Events	6 Months Ended
	Jun. 30, 2019
Subsequent Events [Abstract]
Subsequent Events	Note 9 – Subsequent Events On July 1, 2019, the Company signed a new lease agreement for the lease of its office space at its corporate headquarters in San Jose, California for an additional three years. The lease agreement includes space on the first floor of the building that had been previously subleased. Upon expiration of the current lease on September 30, 2019, the new monthly lease payment starting October 1, 2019 will be $52,970 and is subject to annual escalations up to a maximum monthly lease payment of $64,941. On July 15, 2019, the Company signed a new lease agreement for the lease of office space in Costa Mesa, California for an additional two years. Upon expiration of the current lease on September 30, 2019, the new monthly lease payment starting October 1, 2019 will be $9,773 and is subject to an annual escalation up to a maximum monthly lease payment of $10,200. In August 2019, three of our directors entered into RSU Rescission Agreements with the Company. Pursuant to the agreements, a total of 38,666 shares issued upon settlement of restricted stock units were rescinded and those shares were returned to the Company. The rescissions resulted from the fact that certain restricted stock unit grants exceeded limits contained in the Company’s 2014 Non-Employee Equity Compensation Plan.

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	6 Months Ended
	Jun. 30, 2019
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation The accompanying financial statements are presented in U.S. dollars and have been prepared in accordance with accounting principles generally accepted in the United States of America (“US GAAP”), and pursuant to the accounting and disclosure rules and regulations of the U.S. Securities and Exchange Commission (“SEC”). These unaudited condensed interim financial statements should be read in conjunction with the audited financial statements and notes thereto for the fiscal year ended December 31, 2018 included in the Company's Annual Report on Form 10-K for the fiscal year ended December 31, 2018, filed with the SEC on February 28, 2019. The accounting policies used in preparing these unaudited condensed interim financial statements are consistent with those described in the Company’s December 31, 2018 audited financial statements .
Use of Estimates	Use of Estimates The preparation of financial statements in conformity with US GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and the disclosure of contingent liabilities at the date of the financial statements as well as the reported expenses during the reporting periods. The Company’s significant estimates and assumptions include the valuation of stock-based compensation instruments, recognition of revenue, the useful lives of long-lived assets, and income tax expense. Some of these judgments can be subjective and complex, and, consequently, actual results may differ from these estimates. Although the Company believes that its estimates and assumptions are reasonable, they are based upon information available at the time the estimates and assumptions were made. Actual results could differ from those estimates.
Cash and Cash Equivalents	Cash and Cash Equivalents The Company considers all short-term, highly liquid investments with an original maturity at the date of purchase of three months or less to be cash equivalents. The Company maintains cash balances that may be uninsured or in deposit accounts that exceed Federal Deposit Insurance Corporation limits. The Company maintains its cash deposits with major financial institutions.
Revenue Recognition	Revenue Recognition On January 1, 2018, the Company adopted Accounting Standards Update No. 2014-09, "Revenue from Contracts with Customers" (Topic 606), which is described below in Recent Accounting Pronouncements. In accordance with Topic 606, the Company recognizes revenue using the following five-step approach: 1. Identify the contract with a customer. 2. Identify the performance obligations in the contract. 3. Determine the transaction price of the contract. 4. Allocate the transaction price to the performance obligations in the contract. 5. Recognize revenue when the performance obligations are met or delivered. The Company records revenue associated with product development projects that it enters into with certain customers. In general, these development projects are complex, and the Company does not have certainty about its ability to achieve the project milestones. The achievement of a milestone is dependent on the Company’s performance obligation and requires acceptance by the customer. The Company recognizes revenue based on when the performance obligation is met. However, the Company does not recognize revenue in excess of that payable upon achievement of an accepted milestone, as there would be uncertainty of payment for work that has not been accepted. The payment associated with achieving the performance obligation is generally commensurate with the Company’s effort or the value of the deliverable and is nonrefundable. The Company records the expenses related to these projects in research and development expense, in the periods such expenses were incurred. The Company records royalty revenue from its manufacturing partner, Dialog, based on shipments from Dialog to its customers. Currently, other than royalty revenue from Dialog, the Company’s other revenue source is product development projects.
Research and Development	Research and Development Research and development expenses are charged to operations as incurred. For internally developed patents, all patent application costs are expensed as incurred as research and development expense. Patent application costs, which are generally legal costs, are expensed as research and development costs until such time as the future economic benefits of such patents become more certain. The Company incurred research and development costs of $5,515,017 and $7,639,974 for the three months ended June 30, 2019 and 2018, respectively, and the Company incurred research and development costs of $12,315,695 and $16,361,526 for the six months ended June 30, 2019 and 2018, respectively.
Stock-Based Compensation	Stock-Based Compensation The Company accounts for equity instruments issued to employees, board members and contractors in accordance with accounting guidance that requires awards to be recorded at their fair value on the date of grant and are amortized over the vesting period of the award. The Company recognizes compensation costs on a straight-line basis over the requisite service period of the award, which is typically the vesting term of the equity instrument issued. Under the Energous Corporation Employee Stock Purchase Plan (“ESPP”), employees may purchase a limited number of shares of the Company’s common stock at a 15% discount from the lower of the closing market prices measured on the first and last days of each half-year period. The Company recognizes compensation expense for the fair value of the purchase options, as measured on the grant date.
Income Taxes	Income Taxes Tax benefits are recognized only for tax positions that are more likely than not to be sustained upon examination by tax authorities. The amount recognized is measured as the largest amount of benefit that is greater than 50 percent likely to be realized upon settlement. A liability for “unrecognized tax benefits” is recorded for any tax benefits claimed in the Company’s tax returns that do not meet these recognition and measurement standards. As of June 30, 2019, no liability for unrecognized tax benefits was required to be reported. The Company’s policy is to record interest and penalties on uncertain tax positions as a component of income tax expense. No interest or penalties were recorded during the three or six months ended June 30, 2019 and 2018.
Net Loss Per Common Share	Net Loss Per Common Share Basic net loss per share is computed by dividing net loss available to common stockholders by the weighted average number of shares of common stock outstanding during the period. Diluted earnings per share is computed using the weighted average number of common shares and, if dilutive, potential common shares outstanding during the period. Potential common shares consist of the incremental common shares issuable upon the exercise of stock options and warrants (using the treasury stock method), the vesting of restricted stock units (“RSUs”), performance stock units (“PSUs”) and the shares issuable from the enrollment of employees in the ESPP. The computation of diluted loss per share excludes potentially dilutive securities of 7,228,185 and 7,403,916 for the three months ended June 30, 2019 and 2018, respectively, and 7,228,185 and 7,403,916 for the six months ended June 30, 2019 and 2018, respectively, because their inclusion would be anti-dilutive. Potentially dilutive securities outlined in the table below have been excluded from the computation of diluted net loss per share because the effect of their inclusion would have been anti-dilutive. For the Three Months Ended June 30, For the Six Months Ended June 30, 2019 2018 2019 2018 Warrant issued to private investors 4,702,354 3,035,688 4,702,354 3,035,688 Options to purchase common stock 576,293 856,635 576,293 856,635 RSUs 1,949,538 2,640,034 1,949,538 2,640,034 PSUs - 871,559 - 871,559 Total potentially dilutive securities 7,228,185 7,403,916 7,228,185 7,403,916
Leases	Leases As of January 1, 2019, the Company determines if an arrangement is a lease at the inception of the arrangement. The Company applies the short-term lease recognition exemption and recognizes lease payments in profit or loss at lease commencement for facility or equipment leases that have a lease term of 12 months or less and do not include a purchase option whose exercise is reasonably certain. Operating leases are included in operating lease right-of-use (ROU) assets and operating lease liabilities. ROU assets represent the right to use an underlying asset for the lease term, and lease liabilities represent the obligation to make lease payments arising from the lease. Operating lease ROU assets and liabilities are measured and recorded at the later of the adoption date, January 1, 2019, or the service commencement date based on the present value of lease payments over the lease term. The Company uses the implicit interest rate when readily determinable; however, most leases do not establish an implicit rate, so the Company uses an estimate of the incremental borrowing rate based on the information available at the time of measurement. Lease expense for lease payments is recognized on a straight-line basis over the lease term. See Note 4 – Commitments and Contingencies, Operating Leases
Recent Accounting Pronouncements	Recent Accounting Pronouncements In January 2016, the FASB issued ASU No. 2016-02, “Leases (Topic 842)”. This standard requires that a lessee recognize the assets and liabilities that arise from operating leases. A lessee should recognize in the statement of In November 2016, the FASB issued ASU No. 2016-18, “Statement of Cash Flows (230) – Restricted Cash.” ASU No. 2016-18 requires an entity to include amounts described as restricted cash and restricted cash equivalents with cash and cash equivalents when reconciling the beginning-of-period and end-of-period total amounts shown on the statement of cash flows. It is effective for annual reporting periods beginning after December 15, 2018. The Company has adopted ASU 2016-18 and its adoption had no material impact on its financial statements. In July 2017, the FASB issued a two-part ASU No. 2017-11, I. Accounting for Certain Financial Instruments with Down Round Features and II. Replacement of the Indefinite Deferral for Mandatorily Redeemable Financial Instruments of Certain Nonpublic Entities and Certain Mandatorily Redeemable Noncontrolling Interests with a Scope Exception. ASU 2017-11 amends guidance in FASB ASC 260, Earnings Per Share, FASB ASC 480, Distinguishing Liabilities from Equity, and FASB ASC 815, Derivatives and Hedging. The amendments in Part I of ASU 2017-11 change the classification analysis of certain equity-linked financial instruments (or embedded features) with down round features. The amendments in Part II of ASU 2017-11 re-characterize the indefinite deferral of certain provisions of Topic 480 that now are presented as pending content in the Codification, to a scope exception. Those amendments do not have an accounting effect. ASU 2017-11 is effective for public business entities for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2018. The Company has adopted ASU 2017-11 and its adoption had no material impact on its financial statements. Note 3 – Summary of Significant Accounting Policies, continued Recent Accounting Pronouncements, continued In June 2018, the FASB issued ASU No. 2018-07, “Compensation – Stock Compensation (Topic 718): Improvements to Nonemployee Share-based Payment Accounting.” ASU 2018-07 aligns accounting for share-based payments issued to nonemployees to that of employees under the existing guidance of Topic 718, with certain exceptions. This update supersedes previous guidance for equity-based payments to nonemployees under Subtopic 505-50, “Equity – Equity-based Payments to Nonemployees.” It is effective for annual reporting periods beginning after December 15, 2018. The Company adopted ASU 2018-07 and its adoption had no material impact on its financial statements.
Management's Evaluation of Subsequent Events	Management’s Evaluation of Subsequent Events The Company evaluates events that have occurred after the balance sheet date of June 30, 2019, through the date which the financial statements are issued. Based upon the review, the Company did not identify any subsequent events that would have required adjustment or disclosure in the financial statements.

Summary of Significant Accoun_3

Summary of Significant Accounting Policies (Tables)	6 Months Ended
	Jun. 30, 2019
Accounting Policies [Abstract]
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share	Potentially dilutive securities outlined in the table below have been excluded from the computation of diluted net loss per share because the effect of their inclusion would have been anti-dilutive. For the Three Months Ended June 30, For the Six Months Ended June 30, 2019 2018 2019 2018 Warrant issued to private investors 4,702,354 3,035,688 4,702,354 3,035,688 Options to purchase common stock 576,293 856,635 576,293 856,635 RSUs 1,949,538 2,640,034 1,949,538 2,640,034 PSUs - 871,559 - 871,559 Total potentially dilutive securities 7,228,185 7,403,916 7,228,185 7,403,916

Commitments and Contingencies (

Commitments and Contingencies (Tables)	6 Months Ended
	Jun. 30, 2019
Commitments And Contingencies Disclosure [Abstract]
Schedule of Reconciliation of Undiscounted Cash Flows to Lease Liabilities Recognized	A reconciliation of undiscounted cash flows to lease liabilities recognized as of June 30, 2019 is as follows: Amount (unaudited) 2019 129,566 Present value discount (10% weighted average) (2,026 ) Total operating lease liabilities $ 127,540

Stock Based Compensation (Table

Stock Based Compensation (Tables)	6 Months Ended
	Jun. 30, 2019
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Summary of Stock Option Activity	The following is a summary of the Company’s stock option activity during the six months ended June 30, 2019: Number of Options Weighted Average Exercise Price Weighted Average Remaining Life In Years Intrinsic Value Outstanding at January 1, 2019 656,494 $ 5.57 4.6 $ 252,887 Granted – – – – Exercised (80,201 ) 4.99 – – Forfeited – – – – Outstanding at June 30, 2019 576,293 $ 5.65 4.8 $ 104,601 Exercisable at January 1, 2019 656,494 $ 5.57 4.6 $ 252,887 Vested – – – – Exercised (80,201 ) 4.99 – – Forfeited – – – – Exercisable at June 30, 2019 576,293 $ 5.65 4.8 $ 104,601
Schedule of Restricted Stock Units Activity	A summary of the activity related to RSUs for the six months ended June 30, 2019 is presented below: Total Weighted Average Grant Date Fair Value Outstanding at January 1, 2019 2,469,174 $ 15.07 RSUs granted 495,237 $ 6.15 RSUs forfeited (391,130 ) $ 14.99 RSUs vested (623,743 ) $ 14.94 Outstanding at June 30, 2019 1,949,538 $ 12.86
Summary of Fair Values of Stock Options Granted	The fair values of stock options granted were estimated using the following assumptions: Six Months Ended June 30, 2019 Six Months Ended June 30, 2018 Stock price $ 5.79 $ 22.34 Dividend yield 0 % 0 % Expected volatility 96 % 177 % Risk-free interest rate 2.51 % 1.61 % Expected life 6 months 6 months
Summary of Stock-based Compensation Costs Recognized	The following tables summarize total stock-based compensation costs recognized for the three and six months ended June 30, 2019 and 2018: Three Months Ended June 30, Six Months Ended June 30, 2019 2018 2019 2018 RSUs 2,675,184 $ 3,884,725 5,758,751 $ 8,136,686 PSUs – 204,954 – 407,656 ESPP 122,749 253,201 210,574 407,746 Total $ 2,797,933 $ 4,342,880 $ 5,969,325 $ 8,952,088
Summary of Stock-based Compensation Reflected within Statements of Operations	The total amount of stock-based compensation was reflected within the statements of operations as: Three Months Ended June 30, Six Months Ended June 30, 2019 2018 2019 2018 Research and development $ 1,361,225 $ 2,483,693 $ 3,017,778 $ 5,542,223 Sales and marketing 343,945 388,533 720,993 669,891 General and administrative 1,092,763 1,470,654 2,230,554 2,739,974 Total $ 2,797,933 $ 4,342,880 $ 5,969,325 $ 8,952,088

Liquidity and Management Plans

Liquidity and Management Plans - Additional Information (Detail) - USD ($)	1 Months Ended		3 Months Ended				6 Months Ended
	Mar. 31, 2019	Jan. 31, 2018	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Liquidity And Management Plans [Line Items]
Engineering product development			$ 47,500		$ 205,773		$ 114,000	$ 230,773
Net loss			(9,803,996)	$ (11,019,468)	(12,298,371)	$ (13,443,457)	(20,823,464)	(25,741,828)
Net cash provided by (used in) operating activities							(14,423,911)	(15,371,126)
Proceeds of securities offerings	$ 23,319,156	$ 38,846,815					23,319,156	38,846,815
Cash and cash equivalents, at carrying value, total			29,208,245				29,208,245		$ 20,106,485
Technology Service [Member]
Liquidity And Management Plans [Line Items]
Engineering product development			$ 47,500		$ 205,773		$ 114,000	$ 230,773

Significant Accounting Policies

Significant Accounting Policies - Additional Information (Detail) - USD ($)	Apr. 30, 2015	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Summary Of Significant Accounting Policies [Line Items]
Research and development expense, total		$ 5,515,017	$ 7,639,974	$ 12,315,695	$ 16,361,526
Liability for unrecognized tax benefits		0		0
Interest or penalties for uncertain tax positions		$ 0	$ 0	$ 0	$ 0
Antidilutive securities excluded from computation of earnings per share, amount		7,228,185	7,403,916	7,228,185	7,403,916
Employee Stock Purchase Plan [Member]
Summary Of Significant Accounting Policies [Line Items]
Common stock purchase price discount percentage	85.00%			15.00%

Summary of Significant Accoun_4

Summary of Significant Accounting Policies - Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share (Detail) - shares	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Summary Of Significant Accounting Policies [Line Items]
Total potentially dilutive securities	7,228,185	7,403,916	7,228,185	7,403,916
Warrant Issued to Private Investors [Member]
Summary Of Significant Accounting Policies [Line Items]
Total potentially dilutive securities	4,702,354	3,035,688	4,702,354	3,035,688
Employee Stock Option [Member]
Summary Of Significant Accounting Policies [Line Items]
Total potentially dilutive securities	576,293	856,635	576,293	856,635
Restricted Stock Units (RSUs) [Member]
Summary Of Significant Accounting Policies [Line Items]
Total potentially dilutive securities	1,949,538	2,640,034	1,949,538	2,640,034
Performance Share Units [Member]
Summary Of Significant Accounting Policies [Line Items]
Total potentially dilutive securities		871,559		871,559

Commitments and Contingencies -

Commitments and Contingencies - Operating Leases - Additional Information (Detail) - USD ($)	Mar. 13, 2019	May 31, 2017	Aug. 25, 2015	Sep. 10, 2014	Oct. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Jan. 01, 2019
Commitments And Contingencies [Line Items]
Operating lease right-of-use assets							$ 121,216
Operating lease liabilities							$ 127,540
Remaining weighted average operating lease terms							3 months
Weighted average discount rate used to measure the outstanding operating lease liabilities							10.00%
ASU No. 2016-02 [Member]
Commitments And Contingencies [Line Items]
Operating lease right-of-use assets								$ 414,426
Operating lease liabilities								$ 485,747
San Jose, California [Member]
Commitments And Contingencies [Line Items]
Lease expiration date			Jun. 30, 2019
San Jose, California [Member] | Scenario Forecast [Member]
Commitments And Contingencies [Line Items]
Operating leases, rent expense					$ 52,970
Costa Mesa, California [Member]
Commitments And Contingencies [Line Items]
Operating leases, rent expense		$ 9,040
Lease expiration date		Sep. 30, 2019
Costa Mesa, California [Member] | Scenario Forecast [Member]
Commitments And Contingencies [Line Items]
Operating leases, rent expense					$ 9,773
Balzer Family Investments Lp [Member]
Commitments And Contingencies [Line Items]
Operating leases expiration period				60 months
Operating leases, rent expense				$ 36,720
Lease expiration date	Sep. 30, 2019
Balzer Family Investments Lp [Member] | Scenario Forecast [Member]
Commitments And Contingencies [Line Items]
Operating leases, rent expense						$ 48,372

Commitments and Contingencies_2

Commitments and Contingencies - Schedule of Reconciliation of Undiscounted Cash Flows to Lease Liabilities Recognized (Detail)	Jun. 30, 2019USD ($)
Operating Leases Future Minimum Payments Due [Abstract]
2019	$ 129,566
Present value discount (10% weighted average)	(2,026)
Operating lease liabilities	$ 127,540

Commitments and Contingencies_3

Commitments and Contingencies - Schedule of Reconciliation of Undiscounted Cash Flows to Lease Liabilities Recognized (Parenthetical) (Detail)	Jun. 30, 2019
Operating Leases Future Minimum Payments Due [Abstract]
Weighted average discount rate percent	10.00%

Commitments and Contingencies_4

Commitments and Contingencies - Hosted Design Solution Agreement - Additional Information (Detail) - Hosted Design Solution Agreement [Member] - USD ($)	1 Months Ended			6 Months Ended
	Jul. 31, 2018	Dec. 31, 2015	Jun. 30, 2015	Jun. 30, 2019
Commitments And Contingencies [Line Items]
Initial term of agreement	3 years		3 years
Other cost of services	$ 218,000			$ 101,000
Hardware and software licensed payments period increase		$ 198,000

Commitments and Contingencies_5

Commitments and Contingencies - MBO Bonus Plan - Additional Information (Detail) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Executive Officers [Member]
Commitments And Contingencies [Line Items]
Accrued bonus expense	$ 209,675	$ 492,818	$ 524,188	$ 760,114

Commitments and Contingencies_6

Commitments and Contingencies - Employee Agreement - Stephen Rizzone - Additional Information (Detail) - Mr. Rizzone [Member] - USD ($)	Jan. 01, 2015	Jun. 30, 2019
Commitments And Contingencies [Line Items]
Agreement effective date	Jan. 1, 2015
Initial term of agreement	4 years
Officers' compensation		$ 365,000
Employment agreement percentage of base salary		100.00%

Commitments and Contingencies_7

Commitments and Contingencies - Strategic Alliance Agreement - Additional Information (Detail)	1 Months Ended
	Nov. 30, 2016
Strategic Alliance Agreement [Member]
Commitments And Contingencies [Line Items]
Initial term of agreement	7 years

Stockholders' Equity - Addition

Stockholders' Equity - Additional Information (Detail)	Aug. 17, 2018USD ($)	Mar. 31, 2019USD ($)$ / sharesshares	Jan. 31, 2018USD ($)	Mar. 31, 2019USD ($)$ / sharesshares	Jun. 30, 2019Vote
Class of Stock [Line Items]
Number of common stock voting entitlement per share | Vote					1
Issuance of shares and warrants in private placements, net of issuance costs		$ 23,319,156		$ 23,319,156
Net of issuance costs from offering of shares		$ 1,680,844
Class of warrant or right, number of securities called by warrants or rights | shares		1,666,666		1,666,666
Class of warrant or right, exercise price of warrants or rights | $ / shares		$ 10		$ 10
Consummation of Offering Under Shelf Registration [Member]
Class of Stock [Line Items]
Stock issued during period, value, new issues			$ 38,846,815
Underwriter's discount and issuance costs			$ 1,153,715
Proceeds from shelf registration debt or equity securities	$ 75,000,000

Stock Based Compensation - Equi

Stock Based Compensation - Equity Incentive Plan - Additional Information (Detail) - USD ($)	Apr. 30, 2015	Jun. 30, 2019	May 16, 2018	Dec. 28, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee contribution through payroll withholdings		$ 318,589
Performance Share Units [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			2,710,104
Common stock, capital shares reserved for future issuance			1,400,000
Share-based compensation arrangement by share-based payment award, number of shares available for grant		1,431,951
Employee Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock, capital shares reserved for future issuance	600,000
Share-based compensation arrangement by share-based payment award, number of shares available for grant		257,988
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	7,500
Offering 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 600,000 shares of common stock were reserved for purchase by the Company’s employees, and on May 21, 2015, the Company’s stockholders approved the ESPP. 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. No more than 7,500 shares may be purchased by an employee under the ESPP during an offering period. 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 purchase 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			6,085,967
Common stock, capital shares reserved for future issuance			1,600,000
Common stock to be issued		1,628,225
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			850,000
Common stock, capital shares reserved for future issuance			250,000
Common stock available to be issued		208,842
2017 Equity Inducement Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock available to be issued		308,469
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				600,000

Stock Based Compensation - Summ

Stock Based Compensation - Summary of Stock Option Activity (Detail) - Employee Stock Option [Member] - USD ($)	6 Months Ended	12 Months Ended
	Jun. 30, 2019	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Options, Outstanding	656,494
Number of Options, Granted	0
Number of Options, Exercised	(80,201)
Number of Options, Forfeited	0
Number of Options, Outstanding	576,293	656,494
Number of Options, Exercisable	656,494
Number of Options, Vested	0
Number of Options, Exercised	(80,201)
Number of Options, Forfeited	0
Number of Options, Exercisable	576,293	656,494
Weighted Average Exercise Price, Outstanding	$ 5.57
Weighted Average Exercise Price, Granted	0
Weighted Average Exercise Price, Exercised	4.99
Weighted Average Exercise Price, Forfeited	0
Weighted Average Exercise Price, Outstanding	5.65	$ 5.57
Weighted Average Exercise Price, Exercisable	5.57
Weighted Average Exercise Price, Vested	0
Weighted Average Exercise Price, Exercised	4.99
Weighted Average Exercise Price, Forfeited	0
Weighted Average Exercise Price, Exercisable	$ 5.65	$ 5.57
Weighted Average Remaining Life In Years, Outstanding	4 years 9 months 18 days	4 years 7 months 6 days
Weighted Average Remaining Life In Years, Exercisable	4 years 9 months 18 days	4 years 7 months 6 days
Intrinsic Value, Outstanding	$ 104,601	$ 252,887
Intrinsic Value, Exercisable	$ 104,601	$ 252,887

Stock Based Compensation - Stoc

Stock Based Compensation - Stock Option Award Activity - Additional Information (Detail)	Jun. 30, 2019USD ($)
Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee service share-based compensation, nonvested awards, compensation not yet recognized, stock options	$ 0

Stock Based Compensation - Rest

Stock Based Compensation - Restricted Stock Units - Additional Information (Detail) - Restricted Stock Units (RSUs) [Member]	6 Months Ended
	Jun. 30, 2019USD ($)shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee service share-based compensation, nonvested awards, compensation not yet recognized, share-based awards other than options | $	$ 18,182,223
Employee service share-based compensation, nonvested awards, compensation cost not yet recognized, period for recognition	1 year 10 months 24 days
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, equity instruments other than options, grants in period	157,987
Non-Employee Equity Compensation Plan 2014 [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, award vesting period	1 year
Non-Employee Equity Compensation Plan 2014 [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, award vesting period	3 years
2013 Equity Incentive Plan [Member] | Employee [Member] | Common Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, equity instruments other than options, grants in period	311,750
2013 Equity Incentive Plan [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, award vesting period	1 year
2013 Equity Incentive Plan [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, award vesting period	4 years
2017 Equity Inducement Plan [Member] | Employee [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, equity instruments other than options, grants in period	25,500
Share-based compensation arrangement by share-based payment award, award vesting period	4 years

Stock Based Compensation - Sche

Stock Based Compensation - Schedule of Restricted Stock Units Activity (Detail) - Restricted Stock Units (RSUs) [Member]	6 Months Ended
	Jun. 30, 2019$ / sharesshares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Options, Outstanding | shares	2,469,174
RSUs granted | shares	495,237
RSUs forfeited | shares	(391,130)
RSUs vested | shares	(623,743)
Number of Options, Outstanding | shares	1,949,538
Weighted Average Grant Date Fair Value, Beginning Balance | $ / shares	$ 15.07
Weighted Average Grant Date Fair Value, RSUs granted | $ / shares	6.15
Weighted Average Grant Date Fair Value, RSUs forfeited | $ / shares	14.99
Weighted Average Grant Date Fair Value, RSUs vested | $ / shares	14.94
Weighted Average Grant Date Fair Value, Ending Balance | $ / shares	$ 12.86

Stock Based Compensation - Perf

Stock Based Compensation - Performance Share Units - Additional Information (Detail) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Performance Share Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated share-based compensation expense	$ 0	$ 204,954	$ 0	$ 407,656

Stock Based Compensation - Empl

Stock Based Compensation - Employee Stock Purchase Plan - Additional Information (Detail) - Employee Stock Purchase Plan [Member] - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, equity instruments other than options, grants in period, weighted average grant date fair value			$ 2.43	$ 13.84
Percentage of proportionate value of call option of stock			85.00%
Percentage of proportionate value of put option of stock			15.00%
Allocated share-based compensation expense	$ 122,749	$ 253,201	$ 210,574	$ 407,746

Stock Based Compensation - Su_2

Stock Based Compensation - Summary of Fair Values of Stock Options Granted (Detail) - Employee Stock Purchase Plan [Member] - Employee Stock Option [Member] - $ / shares	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock price	$ 5.79	$ 22.34
Dividend yield	0.00%	0.00%
Expected volatility	96.00%	177.00%
Risk-free interest rate	2.51%	1.61%
Expected life	6 months	6 months

Stock Based Compensation -Summa

Stock Based Compensation -Summary of Stock-based Compensation Costs Recognized (Detail) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total	$ 2,797,933	$ 4,342,880	$ 5,969,325	$ 8,952,088
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Allocated share-based compensation expense	2,675,184	3,884,725	5,758,751	8,136,686
Performance Share Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Allocated share-based compensation expense	0	204,954	0	407,656
Employee Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Allocated share-based compensation expense	$ 122,749	$ 253,201	$ 210,574	$ 407,746

Stock Based Compensation - Su_3

Stock Based Compensation - Summary of Stock-based Compensation Reflected within Statements of Operations (Detail) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Share-based Compensation, Total	$ 2,797,933	$ 4,342,880	$ 5,969,325	$ 8,952,088
Research and Development Expense [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Allocated share-based compensation expense	1,361,225	2,483,693	3,017,778	5,542,223
Selling and Marketing Expense [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Allocated share-based compensation expense	343,945	388,533	720,993	669,891
General and Administrative Expense [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Allocated share-based compensation expense	$ 1,092,763	$ 1,470,654	$ 2,230,554	$ 2,739,974

Related Party Transactions - Ad

Related Party Transactions - Additional Information (Detail) - USD ($)	3 Months Ended		6 Months Ended		8 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Jun. 28, 2017	Mar. 31, 2019
Related Party Transaction [Line Items]
Class of warrant or right, number of securities called by warrants or rights						1,666,666
Dialog Semiconductor Plc [Member]
Related Party Transaction [Line Items]
Equity method investment, ownership percentage	5.70%		5.70%
Percentage of common shares potentially own outstanding shares			9.90%
Dialog Semiconductor Plc [Member] | Research and Development Expense [Member]
Related Party Transaction [Line Items]
Payments for fees	$ 0	$ 0	$ 0	$ 43,700
Strategic Alliance Agreement [Member]
Related Party Transaction [Line Items]
Revenue	$ 0	$ 5,773	$ 7,100	$ 5,773
Private Placements [Member] | Dialog Semiconductor Plc [Member]
Related Party Transaction [Line Items]
Stock issued during period, shares, new issues					1,739,691
Private Placements [Member] | Warrant Issued to Private Investors [Member] | Dialog Semiconductor Plc [Member]
Related Party Transaction [Line Items]
Class of warrant or right, number of securities called by warrants or rights					1,417,565

Customer Concentrations - Addit

Customer Concentrations - Additional Information (Detail) - Customer Concentration Risk [Member] - Customer	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Revenues [Member]
Concentration Risk [Line Items]
Number of customers	2	1	3	1
Concentration percentage	95.00%	97.00%	75.00%	97.00%
Accounts Receivable [Member]
Concentration Risk [Line Items]
Number of customers			2		3
Concentration percentage			95.00%		86.00%

Subsequent Events - Additional

Subsequent Events - Additional Information (Detail)	Aug. 09, 2019Directorshares	May 31, 2017USD ($)	Oct. 31, 2019USD ($)	Jul. 15, 2019	Jul. 01, 2019
Subsequent Event [Member] | Restricted Stock Units (RSUs) [Member] | RSU Rescission Agreements [Member]
Subsequent Event [Line Items]
Number of directors entered into agreements | Director	3
Number of shares rescinded and returned | shares	38,666
San Jose, California [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Operating lease, renewal term					3 years
San Jose, California [Member] | Scenario Forecast [Member]
Subsequent Event [Line Items]
Operating leases, rent expense			$ 52,970
San Jose, California [Member] | Maximum [Member] | Scenario Forecast [Member]
Subsequent Event [Line Items]
Maximum monthly lease payment			64,941
Costa Mesa, California [Member]
Subsequent Event [Line Items]
Operating leases, rent expense		$ 9,040
Costa Mesa, California [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Operating lease, renewal term				2 years
Costa Mesa, California [Member] | Scenario Forecast [Member]
Subsequent Event [Line Items]
Operating leases, rent expense			9,773
Costa Mesa, California [Member] | Maximum [Member] | Scenario Forecast [Member]
Subsequent Event [Line Items]
Maximum monthly lease payment			$ 10,200