EverQuote (EVER) 10-Q 10 May 19 2019 Q1 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2019	Apr. 30, 2019
Document Information [Line Items]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2019
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q1
Trading Symbol	EVER
Entity Registrant Name	EverQuote, Inc.
Entity Central Index Key	0001640428
Current Fiscal Year End Date	--12-31
Entity Filer Category	Non-accelerated Filer
Entity Emerging Growth Company	true
Entity Small Business	true
Entity Ex Transition Period	false
Class A Common Stock [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		10,216,045
Class B Common Stock [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		15,280,343

Condensed Balance Sheets

Condensed Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 37,719	$ 41,634
Accounts receivable	25,856	17,460
Prepaid expenses and other current assets	1,298	1,456
Total current assets	64,873	60,550
Property and equipment, net	4,673	4,481
Other assets	709	715
Total assets	70,255	65,746
Current liabilities:
Accounts payable	21,457	16,826
Accrued expenses and other current liabilities	4,139	3,099
Deferred revenue	1,670	1,440
Total current liabilities	27,266	21,365
Deferred rent, net of current portion	1,203	1,197
Total liabilities	28,469	22,562
Commitments and contingencies (Note 7)
Stockholders' equity:
Preferred stock, $0.001 par value; 10,000,000 shares authorized; no shares issued and outstanding
Additional paid-in capital	146,034	143,050
Accumulated deficit	(104,274)	(99,892)
Total stockholders' equity	41,786	43,184
Total liabilities and stockholders' equity	70,255	65,746
Class A Common Stock [Member]
Stockholders' equity:
Common stock	9	8
Total stockholders' equity	9	8
Class B Common Stock [Member]
Stockholders' equity:
Common stock	17	18
Total stockholders' equity	$ 17	$ 18

Condensed Balance Sheets (Paren

Condensed Balance Sheets (Parenthetical) - $ / shares	Mar. 31, 2019	Dec. 31, 2018
Preferred Stock, Par or Stated Value Per Share	$ 0.001	$ 0.001
Preferred stock, authorized	10,000,000	10,000,000
Preferred Stock, Shares Issued	0	0
Preferred Stock, Shares Outstanding	0	0
Class A Common Stock [Member]
Common stock, par value	$ 0.001	$ 0.001
Common stock, shares authorized	220,000,000	220,000,000
Common stock, shares issued	8,775,000	7,528,741
Common stock, shares outstanding	8,775,000	7,528,741
Class B Common Stock [Member]
Common stock, par value	$ 0.001	$ 0.001
Common stock, shares authorized	30,000,000	30,000,000
Common stock, shares issued	16,664,183	17,696,414
Common stock, shares outstanding	16,664,183	17,696,414

Condensed Statements of Operati

Condensed Statements of Operations and Comprehensive Loss - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Income Statement [Abstract]
Revenue	$ 52,233	$ 40,730
Cost and operating expenses:
Cost of revenue	3,666	2,615
Sales and marketing	44,622	35,023
Research and development	4,685	2,614
General and administrative	3,826	1,713
Total cost and operating expenses	56,799	41,965
Loss from operations	(4,566)	(1,235)
Other income (expense):
Interest expense		(93)
Interest income	184
Total other income (expense), net	184	(93)
Net loss and comprehensive loss	(4,382)	(1,328)
Accretion of redeemable convertible preferred stock to redemption value		(11,013)
Net loss attributable to common stockholders	$ (4,382)	$ (12,341)
Net loss per share attributable to common stockholders, basic and diluted	$ (0.17)	$ (1.42)
Weighted average common shares outstanding, basic and diluted	25,293,625	8,707,208

Statements of Redeemable Conver

Statements of Redeemable Convertible Preferred Stock and Stockholders Equity (Deficit) - USD ($) $ in Thousands	Total	Series A, B and B-1 Redeemable Convertible Preferred Stock [Member]	Class A Common Stock [Member]	Class B Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Deficit [Member]
Convertible preferred shares, beginning balance at Dec. 31, 2017		$ 50,937
Convertible preferred shares, beginning balance, shares at Dec. 31, 2017		1,574,508
Accretion of redeemable convertible preferred stock to redemption value		$ 11,013
Convertible preferred shares, ending balance at Mar. 31, 2018		$ 61,950
Convertible preferred shares, ending balance, shares at Mar. 31, 2018		1,574,508
Beginning balance at Dec. 31, 2017	$ (50,544)			$ 9	$ 766	$ (51,319)
Beginning balance, shares at Dec. 31, 2017			24,000	8,670,992
Issuance of common stock upon exercise of stock options	568				568
Issuance of common stock upon exercise of stock options, shares				386,912
Stock-based compensation expense	567				567
Transfer of Class B common stock to Class A common stock, shares			140,400	(140,400)
Accretion of redeemable convertible preferred stock to redemption value	(11,013)				(1,901)	(9,112)
Net loss	(1,328)					(1,328)
Ending balance at Mar. 31, 2018	(61,750)			$ 9		(61,759)
Ending balance, shares at Mar. 31, 2018			164,400	8,917,504
Convertible preferred shares, beginning balance at Dec. 31, 2017		$ 50,937
Convertible preferred shares, beginning balance, shares at Dec. 31, 2017		1,574,508
Beginning balance at Dec. 31, 2017	(50,544)			$ 9	766	(51,319)
Beginning balance, shares at Dec. 31, 2017			24,000	8,670,992
Net loss	(13,800)
Ending balance at Dec. 31, 2018	43,184		$ 8	$ 18	143,050	(99,892)
Ending balance, shares at Dec. 31, 2018			7,528,741	17,696,414
Issuance of common stock upon exercise of stock options	234				234
Issuance of common stock upon exercise of stock options, shares			114,831
Vesting of restricted stock units	0		$ 0	$ 0	0	0
Vesting of restricted stock units, shares			99,197
Stock-based compensation expense	2,750				2,750
Transfer of Class B common stock to Class A common stock			$ 1	$ (1)
Transfer of Class B common stock to Class A common stock, shares			1,032,231	(1,032,231)
Net loss	(4,382)					(4,382)
Ending balance at Mar. 31, 2019	$ 41,786		$ 9	$ 17	$ 146,034	$ (104,274)
Ending balance, shares at Mar. 31, 2019			8,775,000	16,664,183

Condensed Statements of Cash Fl

Condensed Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Cash flows from operating activities:
Net loss	$ (4,382)	$ (1,328)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization expense	481	294
Stock-based compensation expense	2,750	567
Noncash interest expense		14
Deferred rent	6	148
Changes in operating assets and liabilities:
Accounts receivable	(8,396)	(5,483)
Prepaid expenses and other current assets	158	(285)
Accounts payable	4,631	2,611
Accrued expenses and other current liabilities	1,040	2,475
Deferred revenue	230	144
Net cash used in operating activities	(3,482)	(843)
Cash flows from investing activities:
Acquisition of property and equipment, including costs capitalized for development of internal-use software	(667)	(654)
Net cash used in investing activities	(667)	(654)
Cash flows from financing activities:
Proceeds from exercise of stock options	234	568
Proceeds from borrowings on line of credit		12,729
Repayments of borrowings on line of credit		(8,955)
Repayments of term loan		(2,625)
Payments of initial public offering costs		(4)
Net cash provided by financing activities	234	1,713
Net increase (decrease) in cash, cash equivalents and restricted cash	(3,915)	216
Cash, cash equivalents and restricted cash at beginning of period	41,884	2,613
Cash, cash equivalents and restricted cash at end of period	$ 37,969	2,829
Supplemental disclosure of noncash investing and financing information:
Deferred initial public offering costs included in accounts payable or accrued expenses		1,328
Accretion of redeemable convertible preferred stock to redemption value		$ 11,013

Nature of the Business and Basi

Nature of the Business and Basis of Presentation	3 Months Ended
	Mar. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Nature of the Business and Basis of Presentation	1. Nature of the Business and Basis of Presentation EverQuote, Inc. (the “Company”) was incorporated in the state of Delaware in 2008. Through its internet websites, the Company operates an online marketplace for consumers shopping for auto, home and life insurance quotes. The Company generates revenue by selling consumer referrals to insurance provider customers, consisting of carriers and agents, and indirect distributors in the United States. The Company is subject to a number of risks and uncertainties common to companies in similar industries and stages of development including, but not limited to, rapid technological changes, competition from substitute products and services from larger companies, protection of proprietary technology, customer concentration, patent litigation, the need to obtain additional financing to support growth and dependence on third parties and key individuals. On July 2, 2018, the Company completed an initial public offering (“IPO”), in which it issued and sold 3,125,000 shares of Class A common stock at a public offering price of $18.00 per share, resulting in net proceeds to the Company of approximately $48.6 million after deducting underwriting discounts and commissions and other offering costs. Additionally, certain of the Company’s stockholders sold 1,562,500 shares of Class A common stock at the same public offering price of $18.00 per share. The Company did not receive any proceeds from the sale of shares by its stockholders. Upon closing of the IPO, the Company’s outstanding redeemable convertible preferred stock automatically converted into shares of Class B common stock (see Note 5). The accompanying condensed financial statements have been prepared on the basis of continuity of operations, realization of assets and the satisfaction of liabilities and commitments in the ordinary course of business. Since inception, the Company has incurred operating losses, including net losses of $4.4 million for the three months ended March 31, 2019 and $13.8 million for the year ended December 31, 2018. As of March 31, 2019, the Company had an accumulated deficit of $104.3 million. The Company has primarily funded its operations through issuances of shares of redeemable convertible preferred stock and common stock, debt, including a revolving line of credit with Western Alliance Bank, cash flows from operations and proceeds from the Company’s IPO. As of May 10, 2019, the issuance date of the interim financial statements, the Company expects that its cash and cash equivalents will be sufficient to fund its operating expenses and capital expenditure requirements for at least the next 12 months from the issuance date of the interim financial statements, without considering available borrowings under the Company’s revolving line of credit. The Company’s financial statements have been prepared in conformity with accounting principles generally accepted in the United States of America (“GAAP”). The Company is an “emerging growth company,” as defined in the Jumpstart Our Business Startups Act of 2012 (the “JOBS Act”), and may remain an emerging growth company until the last day of the fiscal year following the fifth anniversary of the IPO, subject to specified conditions. The JOBS Act provides that an emerging growth company can take advantage of the extended transition period afforded by the JOBS Act for the implementation of new or revised accounting standards. The Company has elected not to “opt out” of such extended transition period, which means that when a standard is issued or revised and it has different application dates for public or private companies, the Company will adopt the new or revised standard at the time private companies adopt the new or revised standard, provided that the Company continues to be an emerging growth company.

Summary of Significant Accounti

Summary of Significant Accounting Policies	3 Months Ended
	Mar. 31, 2019
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	2. Summary of Significant Accounting Policies Unaudited Interim Financial Information The balance sheet at December 31, 2018 was derived from audited financial statements but does not include all disclosures required by GAAP. The accompanying unaudited financial statements as of March 31, 2019 and for the three months ended March 31, 2019 and 2018 have been prepared by the Company pursuant to the rules and regulations of the Securities and Exchange Commission (“SEC”) for interim financial statements. Certain information and footnote disclosures normally included in the financial statements prepared in accordance with GAAP have been condensed or omitted pursuant to such rules and regulations. Therefore, these condensed financial statements should be read in conjunction with the Company’s audited financial statements and the notes thereto for the year ended December 31, 2018 included in the Company’s Annual Report on Form 10-K for Use of Estimates The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, the disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenue and expenses during the reporting periods. Significant estimates and assumptions reflected in these financial statements include, but are not limited to, revenue recognition, the expensing and capitalization of website and software development costs, the valuation of stock-based awards and income taxes. The Company bases its estimates on historical experience, known trends and other market-specific or other relevant factors that it believes to be reasonable under the circumstances. On an ongoing basis, management evaluates its estimates, as there are changes in circumstances, facts and experience. Changes in estimates are recorded in periods in which they become known. Actual results may differ from those estimates or assumptions. Concentrations of Credit Risk and of Significant Customers Financial instruments that potentially expose the Company to concentrations of credit risk consist primarily of cash and cash equivalents and accounts receivable. The Company maintains its cash and cash equivalents at two accredited financial institutions. The Company does not believe that it is subject to unusual credit risk beyond the normal credit risk associated with commercial banking relationships. The Company sells its consumer referrals to insurance provider customers, consisting of carriers and agents, and indirect distributors in the United States. For the three months ended March 31, 2019, two customers represented 19% and 11% of total revenue. For the three months ended March 31, 2018, three customers represented 16%, 11% and 10% of total revenue. As of March 31, 2019, two customers accounted for 17% and 15% of the accounts receivable balance. As of December 31, 2018, two customers accounted for 12% and 11% of the accounts receivable balance. Fair Value Measurements Fair value is defined as the exchange price that would be received for an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. Valuation techniques used to measure fair value must maximize the use of observable inputs and minimize the use of unobservable inputs. Financial assets and liabilities carried at fair value are to be classified and disclosed in one of the following three levels of the fair value hierarchy, of which the first two are considered observable and the last is considered unobservable: • Level 1—Quoted prices in active markets for identical assets or liabilities. • Level 2—Observable inputs (other than Level 1 quoted prices), such as quoted prices in active markets for similar assets or liabilities, quoted prices in markets that are not active for identical or similar assets or liabilities, or other inputs that are observable or can be corroborated by observable market data. • Level 3—Unobservable inputs that are supported by little or no market activity and that are significant to determining the fair value of the assets or liabilities, including pricing models, discounted cash flow methodologies and similar techniques. The Company’s cash equivalents of $22.8 million and $22.7 million as of March 31, 2019 and December 31, 2018, respectively, consisting of money market funds, are carried at fair value based on Level 1 inputs. The carrying values of the Company’s accounts receivable, accounts payable and accrued expenses and other current liabilities approximate their fair values due to the short-term nature of these assets and liabilities. Revenue Recognition The Company derives its revenue by selling consumer referrals to its insurance provider customers, including insurance carriers and agents. On January 1, 2019, the Company adopted the new revenue standard ASC 606, discussed below under the heading “Recently Adopted Accounting Pronouncements”, which amended revenue recognition principles and provides a single, comprehensive set of criteria for revenue recognition within and across all industries. The new revenue standard provides a five-step framework whereby revenue is recognized when control of promised goods or services is transferred to a customer at an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. To determine revenue recognition for arrangements that the Company determines are within the scope of the new revenue standard, the Company performs the following five steps: (i) identify the contract(s) with a customer; (ii) identify the performance obligations in the contract; (iii) determine the transaction price; (iv) allocate the transaction price to the performance obligations in the contract; and (v) recognize revenue when (or as) the Company satisfies a performance obligation. The Company only applies the five-step model to contracts when collectability of the consideration to which the Company is entitled in exchange for the goods or services it transfers to the customer is determined to be probable. Amounts are recorded as accounts receivable when the Company’s right to consideration is unconditional. The Company does not assess whether a contract has a significant financing component if the expectation at contract inception is that the period between payment by the customer and the transfer of the promised goods or services to the customer will be one year or less. The Company recognizes revenue when it satisfies its performance obligations by delivering the referrals to its customers in an amount that reflects the consideration to which it expects to be entitled in exchange for those referrals. The Company presents disaggregated revenue from contracts with customers by distribution channel as the distribution channel impacts the nature and amount of the Company’s revenue. Total revenue is comprised of revenue from the following distribution channels: Three Months Ended 2019 2018 Direct channels 93 % 86 % Indirect channels 7 % 14 % 100 % 100 % The Company has elected to apply the practical expedient in ASC 606 to expense incremental direct costs of obtaining a contract, consisting of sales commissions, as incurred as the expected period of benefit of the sales commissions is one year or less. At March 31, 2019, the Company had not capitalized any costs to obtain any of its contracts. Amounts received prior to satisfying the revenue recognition criteria are recorded as deferred revenue in the accompanying balance sheets. Amounts expected to be recognized as revenue within 12 months of the balance sheet date are classified as current deferred revenue. Deferred revenue was $1.7 million and $1.4 million as of March 31, 2019 and December 31, 2018, respectively. During the three months ended March 31, 2019, the Company recognized revenue of $1.0 million that was included in the contract liability balance (deferred revenue) at December 31, 2018. The Company recognizes deferred revenue by first allocating from the beginning deferred revenue balance to the extent that the beginning deferred revenue balance exceeds the revenue to be recognized. Billings during the period are added to the deferred revenue balance to be recognized in future periods. Advertising Expense Advertising expense consists of variable costs that are related to attracting consumers to the Company’s marketplace and generating consumer quote requests, increasing downloads of its social safe-driving mobile app, EverDrive, and promoting its marketplace to insurance carriers and agents. The Company expenses advertising costs as incurred and such costs are included in sales and marketing expense in the accompanying statements of operations and comprehensive loss. During the three months ended March 31, 2019 and 2018, advertising expense totaled $38.4 million and $29.6 million, respectively. Accounts Receivable The Company provides credit to customers in the ordinary course of business and believes its credit policies are prudent and reflect industry practices and business risk. Management reviews accounts receivable on a periodic basis and reserves for receivables in the Company’s allowance for doubtful accounts on a specific identification basis when they are determined to be uncollectible. After the Company has exhausted all collection efforts, the outstanding receivable is written off against the allowance. The Company had no allowance for doubtful accounts as of March 31, 2019 and December 31, 2018, as the Company deemed all amounts to be collectible. Recently Adopted Accounting Pronouncements In May 2014, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) No. 2014-09, Revenue from Contracts with Customers (Topic 606) 2014-09”), catch-up non-public In August 2016, the FASB issued ASU No. 2016-15, Statement of Cash Flows: Classification of Certain Cash Receipts and Cash Payments (Topic 230) 2016-15”), non-public 2016-15 non-public In June 2018, the FASB issued ASU No. 2018-07, Compensation – Stock Compensation (Topic 718), Improvements to Nonemployee Share-Based Payment Accounting 2018-07”). 2018-07 non-employees 2018-07 non-public 2018-07 2014-09. ASU 2018-07 Recently Issued Accounting Pronouncements In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842) (“ASU 2016-02”), which sets a right-of-use asset years. For non-public entities and ASU 2016-02 initially issued ASU No. 2018-11, Leases (Topic 842) a cumulative catch-up adjustment to adopt ASU 2016-02 on January 1, the non-public company requirements. of ASU 2016-02 will material right-of-use assets

Accrued Expenses and Other Curr

Accrued Expenses and Other Current Liabilities	3 Months Ended
	Mar. 31, 2019
Payables and Accruals [Abstract]
Accrued Expenses and Other Current Liabilities	3. Accrued Expenses and Other Current Liabilities Accrued expenses and other current liabilities consisted of the following (in thousands): March 31, December 31, 2019 2018 Accrued employee compensation and benefits $ 1,613 $ 1,369 Accrued advertising expenses 955 919 Other current liabilities 1,571 811 $ 4,139 $ 3,099

Loan and Security Agreement

Loan and Security Agreement	3 Months Ended
	Mar. 31, 2019
Debt Disclosure [Abstract]
Loan and Security Agreement	4. Loan and Security Agreement In March 2018, the Company executed the 2018 Loan and Security Modification Agreement (the “2018 Loan Modification”) which modified the Company’s existing Loan and Security Agreement to provide for a revolving line of credit of $11.0 million which matures in March 2020. Pursuant to the 2018 Loan Modification, borrowings under the revolving line of credit cannot exceed 80% of eligible accounts receivable balances and bear interest at one-half percent (0.5%) Under the 2018 Loan Modification, the Company is subject to specified affirmative and negative covenants until maturity. These covenants include limitations on the Company’s ability to incur additional indebtedness and engage in certain fundamental business transactions, such as mergers or acquisitions. In addition, pursuant to the 2018 Loan Modification, the Company is required to maintain a financial performance covenant: a minimum asset coverage ratio of 1.5 to 1, calculated as the sum of unrestricted cash and qualified accounts receivable divided by borrowings outstanding under the revolving line of credit. Events which would meet the criteria of a default under the 2018 Loan Modification include failure to make payments when due, insolvency events, failure to comply with covenants or material adverse events with respect to the Company. As of March 31, 2019 and December 31, 2018, the Company was in compliance with all covenants related to the revolving line of credit. There can be no guarantee that these covenants will be met in the future, and if not met, that waivers will be obtained. As of March 31, 2019 and December 31, 2018, the Company had no amounts outstanding on the revolving line of credit and $11.0 million was available for borrowing.

Equity

Equity	3 Months Ended
	Mar. 31, 2019
Equity Abstract
Equity	5. Equity Upon closing of the IPO on July 2, 2018, the Company’s authorized shares of common stock were increased to 220,000,000 shares of Class A common stock and 30,000,000 shares of Class B common stock. The Company also authorized 10,000,000 shares of undesignated preferred stock. Each share of Class A common stock entitles the holder to one vote for each share on all matters submitted to a vote of the Company’s stockholders at all meetings of stockholders and written actions in lieu of meetings. Each share of Class B common stock entitles the holder to ten votes for each share on all matters submitted to a vote of the Company’s stockholders at all meetings of stockholders and written actions in lieu of meetings. Holders of both classes of common stock are entitled to receive dividends, when and if declared by the board of directors. Each share of Class B common stock is convertible into one share of Class A common stock at the option of the holder at any time. Automatic conversion shall occur upon the occurrence of a transfer of such share of Class B common stock or at the date and time, or the occurrence of an event, specified by a vote or written consent of the holders of a majority of the voting power of the then outstanding shares of Class B common stock. A transfer is described as a sale, assignment, transfer, conveyance, hypothecation or disposition of such share or any legal or beneficial interest in such share other than certain permitted transfers as described in the Restated Certificate of Incorporation, including a transfer to a holder of Preferred Stock. Each share of Class B common stock held by a stockholder shall automatically convert into one fully paid and non-assessable Acquisitions of treasury stock have been recorded at cost. Treasury stock held was reported as a deduction from stockholders’ deficit. When the treasury stock was retired, the carrying value of the treasury stock was allocated between additional paid-in paid-in paid-in paid-in

Stock-Based Compensation

Stock-Based Compensation	3 Months Ended
	Mar. 31, 2019
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock-Based Compensation	6. Stock-Based Compensation 2008 Stock Incentive Plan The Company’s 2008 Stock Incentive Plan, as amended (the “2008 Plan”), provided for the Company to issue equity awards to employees, consultants, advisors and directors. Upon effectiveness of the Company’s 2018 Equity Incentive Plan, (the “2018 Plan” and, together with the 2008 Plan, the “Plans”) on June 27, 2018, the remaining 583,056 shares that were available for grant under the 2008 Plan became available for grant under the 2018 Plan and no future grants will be made under the 2008 Plan. Additionally, shares underlying awards under the 2008 Plan that expire, terminate or are otherwise surrendered, canceled, forfeited or repurchased by the Company at their original issuance price pursuant to a contractual repurchase right (subject, in the case of incentive stock options, to any limitations of the Internal Revenue Code) will be available for future grants under the 2018 Plan. Shares of common stock issued upon exercise of stock options granted prior to September 8, 2017 will be issued as either Class A common stock or Class B common stock. Shares of common stock issued upon exercise of stock options granted after September 8, 2017 will be issued as Class A common stock. 2018 Equity Incentive Plan The Company’s 2018 Plan became effective on June 27, 2018. The 2018 Plan provides for the grant of incentive stock options, non-qualified Options and restricted stock units (“RSUs”) granted under the Plans vest over periods determined by the board of directors. Options granted under the Plans expire no longer than ten years from the date of the grant. The exercise price for stock options granted is not less than the fair value of common shares as determined by the board of directors as of the date of grant. Prior to the Company’s IPO, the Company’s board of directors valued the Company’s common stock, taking into consideration its most recently available valuation of common stock performed by third parties as well as additional factors which may have changed since the date of the most recent contemporaneous valuation through the date of grant. Subsequent to the IPO, the fair value of the Company’s Class A common stock is based on quoted market prices. Award Issuances During the three months ended March 31, 2019, the Company granted 538,716 service-based RSUs with a weighted average grant date fair value of $5.61 per share to employees. Stock-Based Compensation The Company recorded stock-based compensation expense in the following expense categories of its statements of operations and comprehensive loss (in thousands): Three Months Ended March 31, 2019 2018 Cost of revenue $ — $ 7 Sales and marketing 794 270 Research and development 874 124 General and administrative 1,082 166 $ 2,750 $ 567 As of March 31, 2019, unrecognized compensation expense related to unvested options and RSUs was $36.6 million, which is expected to be recognized over a weighted average period of 5.1 years. The Company also had 129,750 unvested RSUs with an aggregate grant-date fair value of $2.3 million that contain service-based and performance-based vesting conditions for which performance has not been deemed probable and therefore the Company has not yet recorded expense. The RSUs vest in three equal annual installments upon the achievement of certain Company-specific goals in each of the next three years.

Commitments and Contingencies

Commitments and Contingencies	3 Months Ended
	Mar. 31, 2019
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	7. Commitments and Contingencies Operating Leases The Company leases office space in Cambridge, Massachusetts under a non-cancelable operating lease under a non-cancelable operating lease Lease incentives, payment escalations and rent holidays specified in the lease agreements are accrued or deferred as appropriate such that rent expense per square foot is recognized on a straight-line basis over the terms of occupancy. As of March 31, 2019 and December 31, 2018, the Company had a deferred rent liability of $1.2 million. During each of the three months ended March 31, 2019 and 2018, the Company recorded rent expense of $0.5 million. As of March 31, 2019 and December 31, 2018, the Company maintained security deposits of $0.4 million with the landlords of its leases, which amounts are included in other assets on the Company’s balance sheet. Future minimum lease payments under the operating leases as of March 31, 2019 are as follows (in thousands): Year Ending December 31, 2019 (Remaining nine months) $ 1,782 2020 2,573 2021 2,659 2022 2,502 2023 2,534 Thereafter 1,922 $ 13,972 Indemnification Agreements In the normal course of business, the Company may provide indemnification of varying scope and terms to third parties and enters into commitments and guarantees (“Agreements”) under which it may be required to make payments. The duration of these Agreements varies, and in certain cases, is indefinite. Furthermore, many of these Agreements do not limit the Company’s maximum potential payment exposure. In addition, the Company has entered into indemnification agreements with members of its board of directors and executive officers that will require the Company, among other things, to indemnify them against certain liabilities that may arise by reason of their status or service as directors or officers. Through March 31, 2019 and December 31, 2018, the Company has not incurred any material costs as a result of such indemnifications. The Company does not believe that the outcome of any claims under indemnification arrangements will have a material effect on its financial position, results of operations or cash flows, and it has not accrued any liabilities related to such obligations in its financial statements as of March 31, 2019 and December 31, 2018. Legal Proceedings On February 15, 2019, Sean F. Townsend, a purported holder of the Company’s common stock, filed a civil action in the Supreme Court for the State of New York against the Company, the Company’s chief executive officer, chief financial officer, general counsel, the Company’s directors, and the Company’s underwriters for its IPO, captioned Townsend v. EverQuote, Inc. et al. Townsend v. EverQuote, Inc. et al. On March 25, 2019, the parties jointly filed a stipulation that, if allowed, would result in the consolidation of the two lawsuits and provide a schedule that would govern the filing of a consolidated amended complaint and briefing on any dispositive motion filed by the defendants. Also on March 25, 2019, plaintiffs filed requests that the cases be assigned to the Commercial Division of the Supreme Court of New York. The cases were both assigned to the Commercial Division, and the court scheduled a preliminary conference for May 22, 2019. The Company and the individual defendants intend to deny any liability or wrongdoing and to vigorously defend all claims asserted. The Company, from time to time, is subject to legal proceedings and claims that arise in the normal course of its business. In the opinion of management, the amount of ultimate liability with respect to any such actions should not have a material adverse effect on the Company’s results of operations of financial position. As of March 31, 2019 and December 31, 2018, the Company does not have any contingency reserves established for any litigation liabilities.

Net Loss Per Share

Net Loss Per Share	3 Months Ended
	Mar. 31, 2019
Earnings Per Share [Abstract]
Net Loss Per Share	8. Net Loss per Share The Company has two classes of common stock. The rights of the holders of Class A and Class B common stock are identical, except with respect to voting and conversion. As a result, basic and diluted net loss per share of Class A common stock and Class B common stock are equivalent. Basic and diluted net loss per share attributable to common stockholders was calculated as follows (in thousands, except share and per share amounts): Three Months Ended March 31, 2019 2018 Numerator: Net loss $ (4,382 ) $ (1,328 ) Accretion of redeemable convertible preferred stock to redemption value — (11,013 ) Net loss attributable to common stockholders $ (4,382 ) $ (12,341 ) Denominator: Weighted average common shares outstanding, basic and diluted 25,293,625 8,707,208 Net loss per share attributable to common stockholders, basic and diluted $ (0.17 ) $ (1.42 ) The Company’s potentially dilutive securities have been excluded from the computation of diluted net loss per share as the effect would be to reduce the net loss per share attributable to common stockholders. Therefore, the weighted average number of common shares outstanding used to calculate both basic and diluted net loss per share attributable to common stockholders is the same. The Company excluded the following potential common shares, presented based on amounts outstanding at each period end, from the computation of diluted net loss per share attributable to common stockholders for the three months ended March 31, 2019 and 2018 because including them would have had an anti-dilutive effect: March 31, 2019 2018 Redeemable convertible preferred stock (as converted to common stock) — 12,596,064 Options to purchase common stock 3,534,784 3,356,048 Unvested restricted stock units 2,825,909 242,496 6,360,693 16,194,608

Retirement Plan

Retirement Plan	3 Months Ended
	Mar. 31, 2019
Retirement Benefits [Abstract]
Retirement Plan	9. Retirement Plan The Company has established a defined-contribution plan under Section 401(k) of the Internal Revenue Code (the “401(k) Plan”). The 401(k) Plan covers all employees who meet defined minimum age and service requirements, and allows participants to defer a portion of their annual compensation on a pre-tax

Related Party Transactions

Related Party Transactions	3 Months Ended
	Mar. 31, 2019
Related Party Transactions [Abstract]
Related Party Transactions	10. Related Party Transactions The Company has, in the ordinary course of business, entered into arrangements with other companies who have shareholders in common with the Company. Pursuant to these arrangements, related-party affiliates receive payments for providing website visitor referrals and to a lesser extent a small amount of office space. During the three months ended March 31, 2019 and 2018, the Company recorded expense of $1.5 million and $2.3 million, respectively, related to these arrangements. During the three months ended March 31, 2019 and 2018, the Company paid $1.4 million and $2.7 million, respectively, related to these arrangements. As of March 31, 2019 and December 31, 2018, amounts due to related-party affiliates totaled $1.1 million and $1.0 million, respectively, which were included in accounts payable on the balance sheets.

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	3 Months Ended
	Mar. 31, 2019
Accounting Policies [Abstract]
Unaudited Interim Financial Information	Unaudited Interim Financial Information The balance sheet at December 31, 2018 was derived from audited financial statements but does not include all disclosures required by GAAP. The accompanying unaudited financial statements as of March 31, 2019 and for the three months ended March 31, 2019 and 2018 have been prepared by the Company pursuant to the rules and regulations of the Securities and Exchange Commission (“SEC”) for interim financial statements. Certain information and footnote disclosures normally included in the financial statements prepared in accordance with GAAP have been condensed or omitted pursuant to such rules and regulations. Therefore, these condensed financial statements should be read in conjunction with the Company’s audited financial statements and the notes thereto for the year ended December 31, 2018 included in the Company’s Annual Report on Form 10-K for
Use of Estimates	Use of Estimates The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, the disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenue and expenses during the reporting periods. Significant estimates and assumptions reflected in these financial statements include, but are not limited to, revenue recognition, the expensing and capitalization of website and software development costs, the valuation of stock-based awards and income taxes. The Company bases its estimates on historical experience, known trends and other market-specific or other relevant factors that it believes to be reasonable under the circumstances. On an ongoing basis, management evaluates its estimates, as there are changes in circumstances, facts and experience. Changes in estimates are recorded in periods in which they become known. Actual results may differ from those estimates or assumptions.
Concentrations of Credit Risk and of Significant Customers	Concentrations of Credit Risk and of Significant Customers Financial instruments that potentially expose the Company to concentrations of credit risk consist primarily of cash and cash equivalents and accounts receivable. The Company maintains its cash and cash equivalents at two accredited financial institutions. The Company does not believe that it is subject to unusual credit risk beyond the normal credit risk associated with commercial banking relationships. The Company sells its consumer referrals to insurance provider customers, consisting of carriers and agents, and indirect distributors in the United States. For the three months ended March 31, 2019, two customers represented 19% and 11% of total revenue. For the three months ended March 31, 2018, three customers represented 16%, 11% and 10% of total revenue. As of March 31, 2019, two customers accounted for 17% and 15% of the accounts receivable balance. As of December 31, 2018, two customers accounted for 12% and 11% of the accounts receivable balance.
Fair Value Measurements	Fair Value Measurements Fair value is defined as the exchange price that would be received for an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. Valuation techniques used to measure fair value must maximize the use of observable inputs and minimize the use of unobservable inputs. Financial assets and liabilities carried at fair value are to be classified and disclosed in one of the following three levels of the fair value hierarchy, of which the first two are considered observable and the last is considered unobservable: • Level 1—Quoted prices in active markets for identical assets or liabilities. • Level 2—Observable inputs (other than Level 1 quoted prices), such as quoted prices in active markets for similar assets or liabilities, quoted prices in markets that are not active for identical or similar assets or liabilities, or other inputs that are observable or can be corroborated by observable market data. • Level 3—Unobservable inputs that are supported by little or no market activity and that are significant to determining the fair value of the assets or liabilities, including pricing models, discounted cash flow methodologies and similar techniques. The Company’s cash equivalents of $22.8 million and $22.7 million as of March 31, 2019 and December 31, 2018, respectively, consisting of money market funds, are carried at fair value based on Level 1 inputs. The carrying values of the Company’s accounts receivable, accounts payable and accrued expenses and other current liabilities approximate their fair values due to the short-term nature of these assets and liabilities.
Revenue Recognition	Revenue Recognition The Company derives its revenue by selling consumer referrals to its insurance provider customers, including insurance carriers and agents. On January 1, 2019, the Company adopted the new revenue standard ASC 606, discussed below under the heading “Recently Adopted Accounting Pronouncements”, which amended revenue recognition principles and provides a single, comprehensive set of criteria for revenue recognition within and across all industries. The new revenue standard provides a five-step framework whereby revenue is recognized when control of promised goods or services is transferred to a customer at an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. To determine revenue recognition for arrangements that the Company determines are within the scope of the new revenue standard, the Company performs the following five steps: (i) identify the contract(s) with a customer; (ii) identify the performance obligations in the contract; (iii) determine the transaction price; (iv) allocate the transaction price to the performance obligations in the contract; and (v) recognize revenue when (or as) the Company satisfies a performance obligation. The Company only applies the five-step model to contracts when collectability of the consideration to which the Company is entitled in exchange for the goods or services it transfers to the customer is determined to be probable. Amounts are recorded as accounts receivable when the Company’s right to consideration is unconditional. The Company does not assess whether a contract has a significant financing component if the expectation at contract inception is that the period between payment by the customer and the transfer of the promised goods or services to the customer will be one year or less. The Company recognizes revenue when it satisfies its performance obligations by delivering the referrals to its customers in an amount that reflects the consideration to which it expects to be entitled in exchange for those referrals. The Company presents disaggregated revenue from contracts with customers by distribution channel as the distribution channel impacts the nature and amount of the Company’s revenue. Total revenue is comprised of revenue from the following distribution channels: Three Months Ended 2019 2018 Direct channels 93 % 86 % Indirect channels 7 % 14 % 100 % 100 % The Company has elected to apply the practical expedient in ASC 606 to expense incremental direct costs of obtaining a contract, consisting of sales commissions, as incurred as the expected period of benefit of the sales commissions is one year or less. At March 31, 2019, the Company had not capitalized any costs to obtain any of its contracts. Amounts received prior to satisfying the revenue recognition criteria are recorded as deferred revenue in the accompanying balance sheets. Amounts expected to be recognized as revenue within 12 months of the balance sheet date are classified as current deferred revenue. Deferred revenue was $1.7 million and $1.4 million as of March 31, 2019 and December 31, 2018, respectively. During the three months ended March 31, 2019, the Company recognized revenue of $1.0 million that was included in the contract liability balance (deferred revenue) at December 31, 2018. The Company recognizes deferred revenue by first allocating from the beginning deferred revenue balance to the extent that the beginning deferred revenue balance exceeds the revenue to be recognized. Billings during the period are added to the deferred revenue balance to be recognized in future periods.
Advertising Expense	Advertising Expense Advertising expense consists of variable costs that are related to attracting consumers to the Company’s marketplace and generating consumer quote requests, increasing downloads of its social safe-driving mobile app, EverDrive, and promoting its marketplace to insurance carriers and agents. The Company expenses advertising costs as incurred and such costs are included in sales and marketing expense in the accompanying statements of operations and comprehensive loss. During the three months ended March 31, 2019 and 2018, advertising expense totaled $38.4 million and $29.6 million, respectively.
Accounts Receivable	Accounts Receivable The Company provides credit to customers in the ordinary course of business and believes its credit policies are prudent and reflect industry practices and business risk. Management reviews accounts receivable on a periodic basis and reserves for receivables in the Company’s allowance for doubtful accounts on a specific identification basis when they are determined to be uncollectible. After the Company has exhausted all collection efforts, the outstanding receivable is written off against the allowance. The Company had no allowance for doubtful accounts as of March 31, 2019 and December 31, 2018, as the Company deemed all amounts to be collectible.
Recently Adopted Accounting Pronouncements	Recently Adopted Accounting Pronouncements In May 2014, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) No. 2014-09, Revenue from Contracts with Customers (Topic 606) 2014-09”), catch-up non-public In August 2016, the FASB issued ASU No. 2016-15, Statement of Cash Flows: Classification of Certain Cash Receipts and Cash Payments (Topic 230) 2016-15”), non-public 2016-15 non-public In June 2018, the FASB issued ASU No. 2018-07, Compensation – Stock Compensation (Topic 718), Improvements to Nonemployee Share-Based Payment Accounting 2018-07”). 2018-07 non-employees 2018-07 non-public 2018-07 2014-09. ASU 2018-07 Recently Issued Accounting Pronouncements In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842) (“ASU 2016-02”), which sets a right-of-use asset years. For non-public entities and ASU 2016-02 initially issued ASU No. 2018-11, Leases (Topic 842) a cumulative catch-up adjustment to adopt ASU 2016-02 on January 1, the non-public company requirements. of ASU 2016-02 will material right-of-use assets

Summary of Significant Accoun_3

Summary of Significant Accounting Policies (Tables)	3 Months Ended
	Mar. 31, 2019
Accounting Policies [Abstract]
Summary of Revenue by Distribution Chanel	Total revenue is comprised of revenue from the following distribution channels: Three Months Ended 2019 2018 Direct channels 93 % 86 % Indirect channels 7 % 14 % 100 % 100 %

Accrued Expenses and Other Cu_2

Accrued Expenses and Other Current Liabilities (Tables)	3 Months Ended
	Mar. 31, 2019
Payables and Accruals [Abstract]
Summary of Accrued Expenses and Other Current Liabilities	Accrued expenses and other current liabilities consisted of the following (in thousands): March 31, December 31, 2019 2018 Accrued employee compensation and benefits $ 1,613 $ 1,369 Accrued advertising expenses 955 919 Other current liabilities 1,571 811 $ 4,139 $ 3,099

Stock-Based Compensation (Table

Stock-Based Compensation (Tables)	3 Months Ended
	Mar. 31, 2019
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Summary of Stock-Based Compensation Expense of Statements of Operations and Comprehensive Loss	The Company recorded stock-based compensation expense in the following expense categories of its statements of operations and comprehensive loss (in thousands): Three Months Ended March 31, 2019 2018 Cost of revenue $ — $ 7 Sales and marketing 794 270 Research and development 874 124 General and administrative 1,082 166 $ 2,750 $ 567

Commitments and Contingencies (

Commitments and Contingencies (Tables)	3 Months Ended
	Mar. 31, 2019
Commitments and Contingencies Disclosure [Abstract]
Summary of Future Minimum Lease Payments under the Operating Leases	Future minimum lease payments under the operating leases as of March 31, 2019 are as follows (in thousands): Year Ending December 31, 2019 (Remaining nine months) $ 1,782 2020 2,573 2021 2,659 2022 2,502 2023 2,534 Thereafter 1,922 $ 13,972

Net Loss Per Share (Tables)

Net Loss Per Share (Tables)	3 Months Ended
	Mar. 31, 2019
Earnings Per Share [Abstract]
Summary of Basic and Diluted Net Loss Per Share Attributable to Common Stockholders	Basic and diluted net loss per share attributable to common stockholders was calculated as follows (in thousands, except share and per share amounts): Three Months Ended March 31, 2019 2018 Numerator: Net loss $ (4,382 ) $ (1,328 ) Accretion of redeemable convertible preferred stock to redemption value — (11,013 ) Net loss attributable to common stockholders $ (4,382 ) $ (12,341 ) Denominator: Weighted average common shares outstanding, basic and diluted 25,293,625 8,707,208 Net loss per share attributable to common stockholders, basic and diluted $ (0.17 ) $ (1.42 )
Summary of Diluted Net Loss Per Share Attributable to Common Stockholders	The Company excluded the following potential common shares, presented based on amounts outstanding at each period end, from the computation of diluted net loss per share attributable to common stockholders for the three months ended March 31, 2019 and 2018 because including them would have had an anti-dilutive effect: March 31, 2019 2018 Redeemable convertible preferred stock (as converted to common stock) — 12,596,064 Options to purchase common stock 3,534,784 3,356,048 Unvested restricted stock units 2,825,909 242,496 6,360,693 16,194,608

Nature of the Business and Ba_2

Nature of the Business and Basis of Presentation - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	Jul. 02, 2018	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Subsidiary, Sale of Stock [Line Items]
Operating loss		$ (4,382)	$ (1,328)	$ (13,800)
Accumulated deficit		$ (104,274)		$ (99,892)
Initial Public Offering (IPO) [Member] | Class A Common Stock [Member]
Subsidiary, Sale of Stock [Line Items]
Shares of common stock issued and sold	3,125,000
Public offering price, per share	$ 18
Net proceeds from initial public offering	$ 48,600
Sale of stock sold by stockholders shares	1,562,500

Summary of Significant Accoun_4

Summary of Significant Accounting Policies - Additional Information (Detail)	3 Months Ended		12 Months Ended
	Mar. 31, 2019USD ($)Customers	Mar. 31, 2018USD ($)Customers	Dec. 31, 2018USD ($)Customers
Significant Accounting Policies [Line Items]
Capitalized contract cost	$ 0
Deferred revenue	1,700,000		$ 1,400,000
Contract with customer, liability, revenue recognized	1,000,000
Advertising expenses	38,400,000	$ 29,600,000
Allowance for doubtful accounts	0		0
Fair Value, Inputs, Level 1 [Member] | Money Market Funds [Member]
Significant Accounting Policies [Line Items]
Cash equivalents	$ 22,800,000		$ 22,700,000
Sales Revenue, Net [Member] | Customer Concentration Risk [Member]
Significant Accounting Policies [Line Items]
Number of major customers | Customers	2	3
Sales Revenue, Net [Member] | Customer Concentration Risk [Member] | Customers A [Member]
Significant Accounting Policies [Line Items]
Concentration risk percentage	19.00%	16.00%
Sales Revenue, Net [Member] | Customer Concentration Risk [Member] | Customers B [Member]
Significant Accounting Policies [Line Items]
Concentration risk percentage	11.00%	11.00%
Sales Revenue, Net [Member] | Customer Concentration Risk [Member] | Customers C [Member]
Significant Accounting Policies [Line Items]
Concentration risk percentage		10.00%
Accounts Receivable [Member] | Credit Concentration Risk [Member]
Significant Accounting Policies [Line Items]
Number of major customers | Customers	2		2
Accounts Receivable [Member] | Credit Concentration Risk [Member] | Customers A [Member]
Significant Accounting Policies [Line Items]
Concentration risk percentage	17.00%		12.00%
Accounts Receivable [Member] | Credit Concentration Risk [Member] | Customers B [Member]
Significant Accounting Policies [Line Items]
Concentration risk percentage	15.00%		11.00%

Summary of Significant Accoun_5

Summary of Significant Accounting Policies - Summary of Revenue by Distribution Chanel (Detail) - Sales Revenue, Net [Member]	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Product Information [Line Items]
Revenue from Contract with Customer Percentage	100.00%	100.00%
Direct channels [Member]
Product Information [Line Items]
Revenue from Contract with Customer Percentage	93.00%	86.00%
Indirect channels [Member]
Product Information [Line Items]
Revenue from Contract with Customer Percentage	7.00%	14.00%

Accrued Expenses and Other Cu_3

Accrued Expenses and Other Current Liabilities - Summary of Accrued Expenses and Other Current Liabilities (Detail) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Payables and Accruals [Abstract]
Accrued employee compensation and benefits	$ 1,613	$ 1,369
Accrued advertising expenses	955	919
Other current liabilities	1,571	811
Accrued expenses and other current liabilities	$ 4,139	$ 3,099

Loan and Security Agreement - A

Loan and Security Agreement - Additional Information (Detail) - Revolving Credit Facility [Member] - Loan and Security Agreement [Member] - 2018 Loan Modification [Member] - USD ($)	Mar. 27, 2018	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Debt Instrument [Line Items]
Credit facility borrowing capacity			$ 11,000,000
Credit facility, maturity date			Mar. 31, 2020
Maximum percentage borrowings of eligible accounts receivable			80.00%
Debt instrument, interest rate description			Bear interest at one-half percent (0.5%)above the greater of 4.25% or the prime rate.
Annual rate of accrued interest			0.50%
Debt instrument interest rate during period minimum stated percentage			4.25%
Repayment of term loan	$ 2,300,000
Debt Instrument, Covenant Description		The Company is required to maintain a financial performance covenant a minimum asset coverage ratio of 1.5 to 1, calculated as the sum of unrestricted cash and qualified accounts receivable divided by borrowings outstanding under the revolving line of credit.Events which would meet the criteria of a default under the 2018 Loan Modification include failure to make payments when due, insolvency events, failure to comply with covenants or material adverse events with respect to the Company.
Revolving line of credit outstanding amount		$ 0		$ 0
Borrowing under revolving line of credit, remaining amount		$ 11,000,000		$ 11,000,000

Equity - Additional Information

Equity - Additional Information (Detail) - shares	3 Months Ended
	Mar. 31, 2019	Dec. 31, 2018	Jul. 02, 2018
Class of Stock [Line Items]
Preferred stock, authorized	10,000,000	10,000,000	10,000,000
Class A Common Stock [Member]
Class of Stock [Line Items]
Common stock, shares authorized	220,000,000	220,000,000	220,000,000
Common stock, voting right	Class A common stock entitles the holder to one vote for each share
Class B Common Stock [Member]
Class of Stock [Line Items]
Common stock, shares authorized	30,000,000	30,000,000	30,000,000
Common stock, voting right	Class B common stock entitles the holder to ten votes for each share
Common stock, conversion features	Each share of Class B common stock is convertible into one share of Class A common stock at the option of the holder at any time. Each share of Class B common stock held by a stockholder shall automatically convert into one fully paid and non-assessable share of Class A common stock nine months after the death or incapacity of the holder of such Class B common stock.

Stock-Based Compensation - Addi

Stock-Based Compensation - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions	Jan. 01, 2019	Jun. 27, 2018	Mar. 31, 2019
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options expiration period			10 years
Restricted Stock Units (RSUs) [Member] | Employees [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted, shares			538,716
Weighted average grant date fair value, per share			$ 5.61
Restricted Stock Units (RSUs) [Member] | Performance Based And Service Based [Member] | Non Probable Performance Based And Service Based [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unvested Stock options			129,750
Unvested grant-date fair value			$ 2.3
Share based compensation vesting period			3 years
Employee Stock Option and Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense related to unvested options			$ 36.6
Compensation expense, expected recognition period			5 years 1 month 6 days
2008 Stock Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation, common stock available for grant		583,056
2018 Equity Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation, common stock available for grant			1,449,595
Share-based Compensation, number of additional shares available for issuance	1,261,257
2018 Equity Incentive Plan [Member] | Class A Common Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation, common stock available for grant		2,149,480
2018 Equity Incentive Plan [Member] | Class A Common Stock [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation, common stock available for grant		5,028,832
Shares of common stock available for issuance		2,500,000
2018 Equity Incentive Plan [Member] | Class A Common Stock and Class B Common Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation, number of additional shares available from 2008 Stock Incentive Plan		583,056
2018 Equity Incentive Plan [Member] | Class A Common Stock and Class B Common Stock [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of shares of common stock available for issuance		5.00%

Stock-Based Compensation - Summ

Stock-Based Compensation - Summary of Stock-Based Compensation Expense of Statements of Operations and Comprehensive Loss (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Stock-based compensation expense	$ 2,750	$ 567
Cost of Revenue [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Stock-based compensation expense		7
Sales and Marketing [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Stock-based compensation expense	794	270
Research and Development [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Stock-based compensation expense	874	124
General and Administrative [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Stock-based compensation expense	$ 1,082	$ 166

Commitments and Contingencies -

Commitments and Contingencies -Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Operating Leased Assets [Line Items]
Deferred rent liability	$ 1.2		$ 1.2
Rent expense	0.5	$ 0.5
Security deposits	$ 0.4		$ 0.4
Cambridge, Massachusetts [Member]
Operating Leased Assets [Line Items]
Operating lease expiration period	2024-09
Cambridge, Massachusetts [Member] | Additional Space [Member]
Operating Leased Assets [Line Items]
Operating lease commencement period	2019-03
Extended operating lease expiration period	2024-09
Woburn Massachusetts [Member]
Operating Leased Assets [Line Items]
Operating lease expiration period	2022-01

Future Minimum Lease Payments U

Future Minimum Lease Payments Under Operating Leases (Detail) $ in Thousands	Mar. 31, 2019USD ($)
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
2019 (Remaining nine months)	$ 1,782
2020	2,573
2021	2,659
2022	2,502
2023	2,534
Thereafter	1,922
Total	$ 13,972

Net Loss Per Share - Summary of

Net Loss Per Share - Summary of Basic and Diluted Net Loss Per Share Attributable to Common Stockholders (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Numerator:
Net loss	$ (4,382)	$ (1,328)	$ (13,800)
Accretion of redeemable convertible preferred stock to redemption value		(11,013)
Net loss attributable to common stockholders	$ (4,382)	$ (12,341)
Denominator:
Weighted average common shares outstanding, basic and diluted	25,293,625	8,707,208
Net loss per share attributable to common stockholders, basic and diluted	$ (0.17)	$ (1.42)

Net Loss Per Share - Summary _2

Net Loss Per Share - Summary of Diluted Net Loss Per Share Attributable to Common Stockholders (Detail) - shares	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share, amount	6,360,693	16,194,608
Convertible Preferred Stock [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share, amount		12,596,064
Employee Stock Option [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share, amount	3,534,784	3,356,048
Restricted Stock Units (RSUs) [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share, amount	2,825,909	242,496

Retirement Plan - Additional In

Retirement Plan - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Retirement Benefits [Abstract]
Contribution to defined contribution savings plan	$ 0.1	$ 0.1

Related Party Transactions - Ad

Related Party Transactions - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Related Party Transactions [Abstract]
Expense from transactions with related party	$ 1.5	$ 2.3
Payment to related party	1.4	$ 2.7
Due to affiliate	$ 1.1		$ 1