Note 2—Basis of Presentation and Summary of Significant Accounting Policies

The accompanying condensed consolidated financial statements were prepared in accordance with accounting principles generally accepted in the United States of America (“GAAP”) for interim financial information and are unaudited. Certain information and disclosures normally included in consolidated financial statements prepared in accordance with GAAP have been condensed or omitted. The condensed consolidated balance sheet as of December 31, 2017 was derived from audited financial statements, but does not include all disclosures required by GAAP. Accordingly, these condensed consolidated financial statements should be read in conjunction with the Company’s audited consolidated financial statements and related notes included in its Annual Report on Form 10-K for the year ended December 31, 2017.

On January 1, 2018, the Company adopted Accounting Standards Update (“ASU”) No. 2014-09, Revenue from Contracts with Customers (Topic 606), using the modified retrospective method. The adoption of ASU 2014-09 did not result in a change in the timing or amount of revenue recognized. Accordingly, there was no cumulative effect adjustment recorded in the condensed consolidated financial statements upon adoption.

On July 1, 2018, the Company early adopted ASU No. 2018-15, Intangibles-Goodwill and Other-Internal-Use Software (Subtopic 350-40): Customer's Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That is a Service Contract, using the prospective method. ASU 2018-15 aligns the requirements for capitalizing implementation costs incurred in a hosting arrangement that is a service contract with the requirements for capitalizing implementation costs incurred to develop or obtain internal-use software. Previously, all implementation costs for a hosting arrangement that was a service contract were expensed when incurred. The Company’s adoption of ASU 2018-15 did not have a material impact on its consolidated financial statements.

Except for the adoption of ASU 2014-09 and ASU 2018-15, there have been no other changes to the Company’s accounting policies and these unaudited interim condensed consolidated financial statements have been prepared on a basis consistent with that used to prepare the Company’s audited annual consolidated financial statements for the year ended December 31, 2017, and include, in the opinion of management, all adjustments, consisting of normal recurring items, necessary for the fair statement of the condensed consolidated financial statements.

The operating results for the three and nine months ended September 30, 2018 are not necessarily indicative of the results expected for the full year ending December 31, 2018.

Use of Estimates

The preparation of condensed consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosures of contingent assets and liabilities at the date of the condensed consolidated financial statements and the reported amounts of revenue and expenses during the reporting period. Actual results could differ materially from these estimates under different assumptions or circumstances.

Revenue Recognition

The Company determines revenue recognition through the following steps:

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Identification of a contract with a customer

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Identification of the performance obligations in the contract

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Determination of the transaction price

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Allocation of the transaction price to the performance obligations in the contract

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Recognition of revenue when or as the performance obligations are satisfied

The Company maintains agreements with each client and supplier in the form of master service agreements, which set out the terms of the relationship and access to the Company’s platform. The Company’s performance obligation is to provide the use of its platform to clients to develop ad campaigns and select the advertising inventory, data and other add-on features. The Company charges clients a platform fee, based on a percentage of a client’s purchases through the platform, and the transaction price is determined based on the consideration to which it expects to be entitled in exchange for the completion of a transaction, that is, when a bid is won. The platform fee percentage is based on the level of purchases by the client through the platform during the month. The Company recognizes revenue for its platform fee at a point in time when a purchase by the client occurs through its platform, which is when a bid is won. Subsequent to a bid being won through the Company’s platform, the associated fees are generally not subject to refund or adjustment. Historically, any refunds and adjustments have not been material.

The Company reports revenue net of amounts it pays suppliers for the cost of advertising inventory, third-party data and other add-on features (collectively, “Supplier Features”). The determination of whether the Company is the principal or agent, and hence whether to report revenue on a gross basis for the amount of the Supplier Features the clients purchase using the platform plus the Company’s platform fees or on a net basis for the amount of platform fees charged to the client, requires judgment. The Company determined that it is not primarily responsible for the purchase of Supplier Features, but rather, it is primarily responsible to provide a platform that enables clients to bid on advertising inventory, and use data and other add-on features in designing and executing their campaigns. The Company does not control the Supplier Features prior to the purchase by the client, and it does not have pricing latitude with respect to the cost of such features. The platform fee the Company charges clients is a percentage of their purchases through its platform, similar to a commission, and the platform fee is not contingent on the results of an advertising campaign. Based on these and other factors, the Company determined that it is not the principal in the purchase and sale of Supplier Features in all of its arrangements, and therefore, it reports revenue on a net basis for the platform fees charged to clients.

The Company generally bills clients for the gross amount of Supplier Features they purchase through its platform and the platform fees, net of allowances (“Gross Billings”). Some of the Company’s clients have payment relationships directly with advertising inventory suppliers in which case the Company only bills these clients for third-party data, other add-on features and its platform fees. The Company invoices its clients on a monthly basis for the purchases occurring during the month. Invoice payment terms, negotiated on a client-by-client basis, are typically between 30 to 90 days. However, for certain agency clients with sequential liability terms, payments are not due to the Company until such agency client has received payment from its customers who are advertisers. The Company’s accounts receivable are recorded at the amount of Gross Billings for the amounts it is responsible to collect, and accounts payable are recorded at the net amount payable to suppliers. Accordingly, both accounts receivable and accounts payable appear large in relation to revenue reported on a net basis.

Gross Billings, based on the billing address of the clients or client affiliates, were as follows (in thousands):

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2018		2017		2018		2017
US	$	479,489	$	337,134	$	1,282,178	$	843,557
International		89,255		59,370		242,519		146,286
Total	$	568,744	$	396,504	$	1,524,697	$	989,843

Allowance for Doubtful Accounts

The allowance for doubtful accounts was $2.8 million and $2.3 million as of September 30, 2018 and December 31, 2017, respectively.

Recent Accounting Pronouncements

In February 2016, the Financial Accounting Standards Board (“FASB”) issued ASU No. 2016-02, Leases, which requires an entity to recognize right-of-use assets and lease liabilities on its balance sheet and disclose key information about leasing arrangements. The guidance offers specific accounting guidance for a lessee, lessor, and sale and leaseback transactions. Lessees and lessors are required to disclose qualitative and quantitative information about leasing arrangements to enable a user of the financial statements to assess the amount, timing and uncertainty of cash flows arising from leases. Leases will be classified as either finance or operating, with the classification affecting the pattern of expense recognition in the statement of comprehensive income. This guidance is effective for annual reporting periods beginning after December 15, 2018, including interim periods within that reporting period, with early adoption permitted. The original guidance required application on a modified retrospective basis to the earliest period presented. In August 2018, the FASB issued ASU No. 2018-11, Leases (Topic 842): Targeted Improvements, which includes an option to not restate comparative periods in transition but rather to elect to use the effective date of ASU 2016-02, as the date of initial application of transition. Although the Company is in the process of evaluating the impact of this guidance on its consolidated financial statements, the Company currently believes the most significant change will be that most of its operating lease commitments will be recognized as right-of-use assets and liabilities upon adoption of the new guidance, which will be material to the Company’s consolidated balance sheet. ASU 2016-02 will also require the Company to make additional disclosures regarding its leases. The Company plans to elect the option provided by ASU 2018-11 and not restate comparative periods.

In June 2016, the FASB issued ASU No. 2016-13, Financial Instruments-Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments, which is intended to provide more decision-useful information about expected credit losses on financial instruments and other commitments to extend credit held by a reporting entity at each reporting date. ASU 2016-13 revises the impairment model to utilize an expected loss methodology in place of the currently used incurred loss methodology, which will result in more timely recognition of losses on financial instruments, including, but not limited to, available for sale debt securities and accounts receivable. This guidance is effective for annual reporting periods beginning after December 15, 2019, including interim periods within that reporting period. Early adoption is permitted. The Company is currently evaluating the impact of this guidance on its consolidated financial statements.

In June 2018, the FASB issued ASU No. 2018-07, Compensation-Stock Compensation (Topic 718), Improvements to Nonemployee Share-based Payments, which expands the scope of Topic 718 to include share-based payment transactions for acquiring goods and services from nonemployees. This guidance is effective for annual reporting periods beginning after December 15, 2018, including interim periods within that reporting period. Early adoption is permitted. The Company does not expect that the adoption of this guidance will have a material impact on its consolidated financial statements.

In August 2018, the FASB issued ASU No. 2018-13, Fair Value Measurement-Disclosure Framework (Topic 820). The updated guidance modifies the disclosure requirements for fair value measurements by removing, modifying, or adding certain disclosures. This guidance is effective for annual reporting periods beginning after December 15, 2019, including interim periods within that reporting period. Early adoption is permitted for any removed or modified disclosures. The Company is currently assessing the timing and impact of adopting the updated provisions.