1. BASIS OF PRESENTATION

The accompanying unaudited condensed consolidated financial statements have been prepared by Monolithic Power Systems, Inc. (the “Company” or “MPS”) in accordance with the rules and regulations of the Securities and Exchange Commission (the “SEC”). Certain information and disclosures normally included in financial statements prepared in accordance with accounting principles generally accepted in the United States (“GAAP”) have been condensed or omitted in accordance with these accounting principles, rules and regulations. The information in this report should be read in conjunction with the Company’s audited consolidated financial statements and notes thereto included in the Annual Report on Form 10-K for the year ended December 31, 2017, filed with the SEC on March 1, 2018.

In the opinion of management, the accompanying unaudited condensed consolidated financial statements reflect all adjustments (consisting only of normal recurring adjustments) necessary to present fairly the Company’s financial position, results of operations and cash flows for the interim periods presented. The financial statements contained in this Form 10-Q are not necessarily indicative of the results that may be expected for the year ending December 31, 2018 or for any other future periods.

Summary of Significant Accounting Policies

Except for the changes related to revenue recognition discussed in “Recently Adopted Accounting Pronouncements” and in Note 2 below, there have been no other changes to the Company’s significant accounting policies during the three months ended March 31, 2018 as compared to the significant accounting policies described in the Company’s audited consolidated financial statements included in the Annual Report on Form 10-K for the year ended December 31, 2017.

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), which outlines a single comprehensive model for entities to use in accounting for revenue arising from contracts with customers. The standard’s core principle is that an entity will recognize revenue when it transfers promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. The Company adopted the standard on January 1, 2018 using the modified retrospective method applied to those contracts which were not completed as of December 31, 2017. Results for reporting periods beginning after January 1, 2018 are presented under Topic 606, while prior-period amounts have not been retrospectively adjusted and continue to be reported in accordance with Topic 605, Revenue Recognition.

The Company recorded a net increase to the opening balance of retained earnings of $0.4 million, net of tax, as of January 1, 2018 due to the cumulative effect of initially applying Topic 606, primarily related to the change in revenue recognition for three U.S.-based distributors. Sales to these distributors are transacted under the terms of agreements providing price adjustment rights. Prior to the adoption of Topic 606, revenue and costs related to these sales were deferred until the Company received notification from the distributors that the products had been sold to the end customers and the amount of price adjustments was fixed and finalized. Upon adoption of Topic 606, the transaction price takes into consideration the effect of variable consideration such as price adjustments, which are estimated and recorded at the time the promised goods are transferred to the distributors. Accordingly, effective January 1, 2018, the Company recognizes revenue at the time of shipment to the distributors, adjusted for an estimate of the price adjustments based on management’s review of historical data and other information available at the time. See Note 2 for further discussion.

In November 2016, the FASB issued ASU No. 2016-18, Statement of Cash Flows - Restricted Cash (Topic 230), which requires entities to show the changes in the total of cash, cash equivalents and restricted cash in the statement of cash flows. The Company adopted the standard on January 1, 2018 and applied the guidance retrospectively to all periods presented. See Note 9 for further discussion.

Recent Accounting Pronouncements Not Yet Adopted as of March 31, 2018

In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842), which requires entities to recognize a right-of-use asset and a lease liability on the balance sheets for substantially all leases with a lease term greater than 12 months, including leases currently accounted for as operating leases. In addition, the standard applies to leases embedded in service arrangements. The standard requires modified retrospective adoption and will be effective for annual reporting periods beginning after December 15, 2018, with early adoption permitted. The Company is evaluating the impact of the adoption on its consolidated financial position, results of operations, cash flows and disclosures.

In June 2016, the FASB issued ASU No. 2016-13, Financial Instruments – Credit Losses (Topic 326), which introduces a model based on expected losses to estimate credit losses for most financial assets and certain other instruments. In addition, for available-for-sale debt securities with unrealized losses, the losses will be recognized as allowances rather than reductions in the amortized cost of the securities. The standard will be effective for annual reporting periods beginning after December 15, 2019, with early adoption permitted for annual reporting periods beginning after December 15, 2018. Entities will apply the standard by recording a cumulative-effect adjustment to retained earnings. The Company is evaluating the impact of the adoption on its consolidated financial position, results of operations, cash flows and disclosures.

In January 2017, the FASB issued ASU No. 2017-04, Intangibles – Goodwill and Other (Topic 350), which simplifies the accounting for goodwill impairment. The guidance removes step two of the goodwill impairment test, which requires a hypothetical purchase price allocation. A goodwill impairment will now be the amount by which a reporting unit’s carrying value exceeds its fair value, not to exceed the carrying amount of goodwill. Entities will continue to have the option to perform a qualitative assessment to determine if a quantitative impairment test is necessary. The standard will be applied prospectively, and is effective for annual reporting periods beginning after  December 15, 2019. Early adoption is permitted. The Company is evaluating the impact of the adoption on its annual goodwill impairment test.

2. REVENUE RECOGNITION

Revenue from Product Sales

The following table presents the Company’s revenue disaggregated by end market (in thousands, except for percentages):

_______________

The Company generates revenue primarily from product sales, which include assembled and tested integrated circuits and dies in wafer form to the consumer, computing and storage, industrial, automotive and communications markets. The Company also generates royalty revenue from licensing arrangements and revenue from wafer testing services performed for third parties, which have not been significant in all periods presented.

The Company sells its products primarily through third-party distributors, value-added resellers, original equipment manufacturers, original design manufacturers and electronic manufacturing service providers. For both the three months ended March 31, 2018 and 2017, approximately 88% of the Company’s sales were made through distribution arrangements, which contain enforceable rights and obligations specific to those distributors and not the end customers. Purchase orders, which are governed by sales agreements or the Company's standard terms of sale, state the final terms for unit price, quantity, shipping and payment agreed by both parties. The Company considers purchase orders to be the contracts with customers. The unit price as stated on the purchase orders is considered the observable, stand-alone selling price for the arrangements.

Under Topic 606, the Company recognizes revenue when it satisfies a performance obligation by transferring control of the promised goods or services to its customers, in an amount that reflects the consideration the Company expects to be entitled to in exchange for those goods or services. The Company excludes taxes assessed by government authorities, such as sales taxes, from revenue.

Product sales consist of a single performance obligation that the Company satisfies at a point in time. The Company recognizes product revenue from distributors and direct end customers when the following events have occurred: (a) the Company has transferred physical possession of the products, (b) the Company has a present right to payment, (c) the customer has legal title to the products, and (d) the customer bears significant risks and rewards of ownership of the products. In accordance with the shipping terms specified in the contracts, these criteria are generally met when the products are shipped from the Company’s facilities (such as the “Ex Works” shipping term) or delivered to the customers’ locations (such as the “Delivered Duty Paid” shipping term).

Under certain consignment agreements, revenue is not recognized when the products are held at customers’ designated locations because the Company retains ownership and the customers do not have an unconditional obligation to pay. The Company recognizes revenue when the customers pull the products from the locations or after a 60-day period lapses, at which time control transfers to the customers and the Company invoices them for payment.

Variable Consideration

The Company records variable consideration as a reduction to revenue in the same period the revenue is recognized. Three U.S.-based distributors have price adjustment rights when they sell the Company’s products to their end customers at a price that is lower than the distribution price invoiced by the Company. When the Company receives claims from the distributors that products have been sold to the end customers at the lower price, the Company issues the distributors credit memos for the price adjustments. The Company estimates the price adjustments based on analyses of historical claims, at both the distributor and product level, as well as an assessment of any known trends of product sales mix. Other U.S. distributors and non-U.S. distributors, which make up the majority of the Company’s total sales to distributors, do not have price adjustment rights.

In addition, certain distributors have limited stock rotation rights that permit the return of a small percentage of the previous six months’ purchases. The Company estimates the stock rotation returns based on analyses of historical returns, and the current level of inventory in the distribution channel.  The Company recognizes an asset for product returns which represents the right to recover products from the customers related to stock rotations, with a corresponding reduction to cost of goods sold.

Contract Balances

The Company records a receivable when it has an unconditional right to receive consideration after the performance obligations are satisfied. As of March 31, 2018 and December 31, 2017, accounts receivable totaled $48.2 million and $38.0 million, respectively. To manage credit risk, management performs ongoing credit evaluations of its customers’ financial condition. The Company did not recognize any impairment losses related to its receivables in any of the periods presented.

For certain customers located in Asia, the Company requires cash payments two weeks before the products are scheduled to be shipped to the customers. The Company records these payments received in advance of performance as customer prepayments within current liabilities. As of March 31, 2018 and December 31, 2017, customer prepayments totaled $2.9 million and $4.7 million, respectively. The decrease in the customer prepayment balance for the three months ended March 31, 2018 resulted from a decrease in unfulfilled customer orders for which the Company has received payments. For the three months ended March 31, 2018, the Company recognized $4.6 million of revenue that was included in the customer prepayment balance as of December 31, 2017.

Contract Costs

The Company pays sales commissions based on the achievement of pre-determined product sales targets. As the Company recognizes product sales at a point in time, sales commissions are expensed as incurred.

Warranty

The Company generally provides one to two-year warranties against defects in materials and workmanship and will either repair the products, provide replacements at no charge to customers or issue a refund. As they are considered assurance-type warranties, the Company does not account for them as separate performance obligations. Warranty reserve requirements are based on a specific assessment of the products sold with warranties when a customer asserts a claim for warranty or a product defect. 

Practical Expedients

The Company’s standard payment terms generally require customers to pay 30 to 60 days after the Company satisfies the performance obligations. For those customers who are required to pay in advance, the Company satisfies the performance obligations typically within one quarter. The Company has elected not to determine whether contacts with customers contain significant financing components.

As of March 31, 2018, the Company’s unsatisfied performance obligations primarily included products held in consignment arrangements and customer purchase orders for products that the Company has not yet shipped. Because the Company expects to fulfill these performance obligations within one year, the Company has elected not to disclose the amount of these remaining performance obligations or the timing of recognition.

Changes to Financial Statement Line Items

The following tables compare the impact on the financial statement line items between the application of Topic 606 and Topic 605 as of March 31, 2018 and for the three months ended March 31, 2018. The significant changes between the two standards are primarily attributable to the following:

Condensed Consolidated Balance Sheets (in thousands):

Condensed Consolidated Statements of Operations (in thousands):

Condensed Consolidated Statements of Comprehensive Income (in thousands):

Condensed Consolidated Statements of Cash Flows (in thousands):

3. STOCK-BASED COMPENSATION

2014 Equity Incentive Plan (the “2014 Plan”)

The Board of Directors adopted the 2014 Plan in April 2013, and the stockholders approved it in June 2013. In October 2014, the Board of Directors approved certain amendments to the 2014 Plan. The 2014 Plan, as amended, became effective on November 13, 2014 and provides for the issuance of up to 5.5 million shares. The 2014 Plan will expire on November 13, 2024. As of March 31, 2018, 2.7 million shares remained available for future issuance under the 2014 Plan. 

Stock-Based Compensation Expense

The Company recognized stock-based compensation expenses as follows (in thousands):

Restricted Stock Units

The Company’s restricted stock units (“RSUs”) include time-based RSUs, RSUs with only performance conditions (“PSUs”), RSUs with both market and performance conditions (“MPSUs”), and RSUs with only market conditions (“MSUs”). Vesting of all awards requires continued service for the Company. In addition, vesting of awards with performance conditions or market conditions is subject to the achievement of pre-determined performance goals. A summary of RSU activity is presented in the table below (in thousands, except per-share amounts): 

The intrinsic value related to RSUs released was $49.5 million and $37.4 million for the three months ended March 31, 2018 and 2017, respectively. As of March 31, 2018, the total intrinsic value of all outstanding RSUs was $451.7 million, based on the closing stock price of $115.77. As of March 31, 2018, unamortized compensation expense related to all outstanding RSUs was $117.2 million with a weighted-average remaining recognition period of approximately 3.5 years. 

Cash proceeds from the release of PSUs with a purchase price feature totaled $7.8 million for the three months ended March 31, 2018. There were no proceeds for the three months ended March 31, 2017.

Time-Based RSUs:

For the three months ended March 31, 2018, the Compensation Committee of the Board of Directors (the "Compensation Committee") granted 53,000 RSUs, respectively, with time-based vesting conditions to employees and non-employee directors. The RSUs vest over four years for employees and one year for directors, subject to continued service with the Company.

2018 PSUs:

In February 2018, the Compensation Committee granted 188,000 PSUs to the executive officers, which represent a target number of shares to be awarded based on the Company’s average two-year (2018 and 2019) revenue growth rate compared against the analog industry’s average two-year revenue growth rate as published by the Semiconductor Industry Association (“2018 Executive PSUs”). The maximum number of shares that an executive officer can earn is 300% of the target number of the 2018 Executive PSUs. 50% of the 2018 Executive PSUs will vest in the first quarter of 2020 if the pre-determined performance goals are met during the performance period and approved by the Compensation Committee. The remaining 2018 Executive PSUs will vest over the following two years on a quarterly basis. Vesting is subject to the employees’ continued employment with the Company. Assuming the achievement of the highest level of performance goals, the total stock-based compensation cost for the 2018 Executive PSUs is $46.1 million.

In February 2018, the Compensation Committee granted 44,000 PSUs to certain non-executive employees, which represent a target number of shares to be awarded based on the Company’s 2019 revenue goals for certain regions or product line divisions, or based on the Company’s average two-year (2018 and 2019) revenue growth rate compared against the analog industry’s average two-year revenue growth rate as published by the Semiconductor Industry Association (“2018 Non-Executive PSUs”). The maximum number of shares that an employee can earn is either 200% or 300% of the target number of the 2018 Non-Executive PSUs, depending on the job classification of the employee. 50% of the 2018 Non-Executive PSUs will vest in the first quarter of 2020 if the pre-determined performance goals are met during the performance period and approved by the Compensation Committee. The remaining 2018 Non-Executive PSUs will vest over the following two years on an annual or quarterly basis. Vesting is subject to the employees’ continued employment with the Company. Assuming the achievement of the highest level of performance goals, the total stock-based compensation cost for the 2018 Non-Executive PSUs, excluding cancelled shares, is $8.9 million.

The 2018 Executive PSUs and the 2018 Non-Executive PSUs contain a purchase price feature, which requires the employees to pay the Company $30 per share upon vesting of the shares. Shares that do not vest will not be subject to the purchase price payment. The Company determined the grant date fair value of the 2018 Executive PSUs and the 2018 Non-Executive PSUs using the Black-Scholes model with the following assumptions: stock price of $110.00, expected term of 2.6 years, expected volatility of 27.5% and risk-free interest rate of 2.3%. 

2015 MPSUs:

On December 31, 2015, the Compensation Committee granted 86,000 MPSUs to the executive officers and 41,000 MPSUs to certain non-executive employees, which represent a target number of shares to be awarded upon achievement of both market conditions and performance conditions (“2015 MPSUs”). The maximum number of shares that an employee can earn is 500% of the target number of the 2015 MPSUs. The 2015 MPSUs consist of four separate tranches with various performance periods ending on December 31, 2019. The first tranche contains market conditions only, which require the achievement of five stock price targets ranging from $71.36 to $95.57 with a performance period from January 1, 2016 to December 31, 2019. As of September 30, 2017, all five price targets for the first tranche have been achieved and approved by the Compensation Committee.

The second, third and fourth tranches contain both market conditions and performance conditions. Each tranche requires the achievement of five stock price targets measured against a base price equal to the greater of: (1) the average closing stock price during the 20 consecutive trading days immediately before the start of the performance period for that tranche, or (2) the closing stock price immediately before the start of the performance period for that tranche. The stock price targets for the second tranche range from $89.56 to $106.81 with a performance period from January 1, 2017 to December 31, 2019. As of December 31, 2017, all five price targets for the second tranche have been achieved and approved by the Compensation Committee. The stock price targets for the third tranche range from $120.80 to $135.48 with a performance period from January 1, 2018 to December 31, 2019. As of March 31, 2018, none of the stock price targets for the third tranche have been achieved and approved by the Compensation Committee. The stock price targets for the fourth tranche will be determined on December 31, 2018 with a performance period from January 1, 2019 to December 31, 2019.

In addition, each of the second, third and fourth tranches requires the achievement of one of following six operating metrics:

As of March 31, 2018, none of the operating metrics have been achieved.

Subject to the employees’ continued employment with the Company, the 2015 MPSUs will fully vest on January 1, 2020 if the pre-determined individual market and performance goals in each tranche are met during the performance periods and approved by the Compensation Committee. In addition, the 2015 MPSUs contain sales restrictions on the vested shares by employees for up to two years.

The Company determined the grant date fair value of the 2015 MPSUs using a Monte Carlo simulation model with the following weighted-average assumptions: stock price of $61.35, expected volatility of 33.2%, risk-free interest rate of 1.3%, and an illiquidity discount of 7.8% to account for the post-vesting sales restrictions. Assuming the achievement of all of the required market and performance goals, the total stock-based compensation cost for the 2015 MPSUs, excluding cancelled shares, is $24.6 million ($8.3 million for the first tranche, $4.5 million for the second tranche, $5.2 million for the third tranche, and $6.6 million for the fourth tranche).

For the first tranche, stock-based compensation expense is being recognized over the requisite service period. For the second, third and fourth tranches, stock-based compensation expense for each tranche is recognized depending upon the number of the operating metrics management deems probable of being achieved during the performance periods in each reporting period. As of March 31, 2018, based on management’s quarterly assessment, three of the six operating metrics were considered probable of being achieved during the performance periods. Accordingly, stock-based compensation expense is being recognized for the second, third and fourth tranches over the requisite service period.

Employee Stock Purchase Plan (“ESPP”)

For the three months ended March 31, 2018 and 2017, 18,000 and 22,000 shares, respectively, were issued under the ESPP. As of March 31, 2018, 4.6 million shares were available for future issuance.

The intrinsic value of the shares issued was $0.5 million for both the three months ended March 31, 2018 and 2017. As of March 31, 2018, the unamortized expense was $0.3 million, which will be recognized through the third quarter of 2018. The Black-Scholes model was used to value the employee stock purchase rights with the following weighted-average assumptions: 

Cash proceeds from the shares issued under the ESPP were $1.6 million and $1.4 million for the three months ended March 31, 2018 and 2017, respectively. 

4. BALANCE SHEET COMPONENTS

Inventories 

Inventories consist of the following (in thousands): 

Other Current Assets

Other current assets consist of the following (in thousands):

Under Topic 606, assets for product returns represent the carrying value of inventory the Company expects to recover from customers related to stock rotation returns. Prior to the adoption of Topic 606, such amounts were netted against the stock rotation reserve.

Other Long-Term Assets

Other long-term assets consist of the following (in thousands):

Accrued Liabilities

Accrued liabilities consist of the following (in thousands): 

A roll-forward of the warranty reserve is as follows (in thousands):

Other Long-Term Liabilities

Other long-term liabilities consist of the following (in thousands):

5. GOODWILL AND ACQUISITION-RELATED INTANGIBLE ASSETS, NET

There have been no changes in the balance of goodwill during the three months ended March 31, 2018.

Acquisition-related intangible assets consist of the following (in thousands):

Amortization expense is recorded in cost of revenue in the Condensed Consolidated Statements of Operations. For the three months ended March 31, 2018 and 2017, amortization expense totaled $0.3 million and $0.5 million, respectively.

As of March 31, 2018, the estimated future amortization expense was as follows (in thousands):

6. NET INCOME PER SHARE

Basic net income per share is computed by dividing net income by the weighted-average number of common shares outstanding for the period. Diluted net income per share reflects the potential dilution that would occur if outstanding securities or other contracts to issue common stock were exercised or converted into common shares, and calculated using the treasury stock method. Contingently issuable shares, including equity awards with performance conditions or market conditions, are considered outstanding common shares and included in the basic net income per share as of the date that all necessary conditions to earn the awards have been satisfied. Prior to the end of the contingency period, the number of contingently issuable shares included in the diluted net income per share is based on the number of shares, if any, that would be issuable under the terms of the arrangement at the end of the reporting period.

The Company’s outstanding RSUs contain forfeitable rights to receive cash dividend equivalents, which are accumulated and paid to the employees when the underlying RSUs vest. Dividend equivalents accumulated on the underlying RSUs are forfeited if the employees do not fulfill their service requirement and the awards do not vest. Accordingly, these awards are not treated as participating securities in the net income per share calculation. 

The following table sets forth the computation of basic and diluted net income per share (in thousands, except per-share amounts):

7. SEGMENT AND GEOGRAPHIC INFORMATION

The Company operates in one reportable segment that includes the design, development, marketing and sale of high-performance analog solutions for the consumer, computing and storage, industrial, automotive and communications markets. The Company’s chief operating decision maker is its Chief Executive Officer, who reviews financial information presented on a consolidated basis for purposes of allocating resources and evaluating financial performance. The Company derives a majority of its revenue from sales to customers located outside North America, with geographic revenue based on the customers’ ship-to locations. 

The Company sells its products primarily through third-party distributors and value-added resellers, and directly to original equipment manufacturers, original design manufacturers and electronic manufacturing service providers. The following table summarizes those customers with sales equal to or greater than 10% of the Company's total revenue or with accounts receivable balances greater than 10% of the Company’s total accounts receivable:

__________________

* Represents less than 10%.

The Company’s agreements with these third-party distributors and value-added reseller were made in the ordinary course of business and may be terminated with or without cause by these customers with advance notice. Although the Company may experience a short-term disruption in the distribution of its products and a short-term decline in revenue if its agreement with any of these customers was terminated, the Company believes that such termination would not have a material adverse effect on its financial statements because it would be able to engage alternative distributors, resellers and other distribution channels to deliver its products to end customers within a short period following the termination of the agreement with the customer. 

The following is a summary of revenue by geographic regions (in thousands):

The following is a summary of revenue by product family (in thousands):

The following is a summary of long-lived assets by geographic regions (in thousands):

8. LITIGATION

The Company is a party to actions and proceedings in the ordinary course of business, including potential litigation initiated by its shareholders, challenges to the enforceability or validity of its intellectual property, claims that the Company’s products infringe on the intellectual property rights of others, and employment matters. These proceedings often involve complex questions of fact and law and may require the expenditure of significant funds and the diversion of other resources to prosecute and defend. The Company defends itself vigorously against any such claims. As of March 31, 2018, there were no material pending legal proceedings to which the Company was a party.

9. CASH, CASH EQUIVALENTS, INVESTMENTS AND RESTRICTED CASH

The following is a summary of the Company’s cash, cash equivalents and short-term and long-term investments (in thousands): 

The contractual maturities of the Company’s short-term and long-term available-for-sale investments are as follows (in thousands):

The following tables summarize the unrealized gain and loss positions related to the Company’s available-for sale investments (in thousands): 

Restricted Cash

The following table provides a reconciliation of cash, cash equivalents, and restricted cash reported within the Condensed Consolidated Balance Sheets to the amounts shown in the Condensed Consolidated Statements of Cash Flows:

Restricted cash includes a security deposit that is set aside in a bank account and cannot be withdrawn by the Company under the terms of a lease agreement. The restriction will end and any unused amount will be returned to the Company upon the expiration of the lease.

10. FAIR VALUE MEASUREMENTS  

The following table details the fair value measurement of the financial assets (in thousands):

_________________

The Company’s level 3 assets consist of government-backed student loan auction-rate securities, which became illiquid in 2008. The following table provides a rollforward of the fair value of the auction-rate securities (in thousands): 

The Company determined the fair value of the auction-rate securities using a discounted cash flow model with the following assumptions:

11. DEFERRED COMPENSATION PLAN

The following table summarizes the deferred compensation plan balances in the Condensed Consolidated Balance Sheets (in thousands):

12. INTEREST AND OTHER INCOME, NET

The components of interest and other income, net are as follows (in thousands):

13. INCOME TAXES

The Company has not adjusted its provisional tax estimates related to the U.S. Tax Cuts and Jobs Act enacted in December 2017 (the “2017 Tax Act”) that were recorded in the fourth quarter of 2017. These amounts remained as estimates as of March 31, 2018 and, as permitted by Staff Accounting Bulletin No. 118, they will be refined through December 2018 based on the Company’s ongoing analysis of data and tax positions along with new guidance from regulators and interpretation of the law.

The income tax provision for the three months ended March 31, 2018 was $0.6 million, or 2.8% of pre-tax income. The effective tax rate differed from the federal statutory rate primarily because foreign income generated by the Company’s subsidiaries in Bermuda and China was taxed at lower rates, and because of certain stock-based compensation deductions. In addition, the effective tax rate was impacted by the effects of the inclusion of the global intangible low-taxed income ("GILTI") under the 2017 Tax Act.

For the three months ended March 31, 2018, the Company’s effective tax rate included the estimated impact of $12.4 million related to the GILTI provisions that was included as additional subpart F income, which was accounted for as a period cost. In addition, for the three months ended March 31, 2018, the Company paid the 2018 installment of $1.9 million related to the deemed repatriation transition tax liability. As of March 31, 2018, the remaining $22.0 million transition tax liability was recorded in long-term income tax liabilities on the Condensed Consolidated Balance Sheet.

The income tax provision for the three months ended March 31, 2017 was $0.5 million, or 3.2% of pre-tax income. The effective tax rate differed from the federal statutory rate primarily because foreign income generated by the Company’s subsidiaries in Bermuda and China was taxed at lower rates. In addition, the effective tax rate was impacted by changes in the valuation allowance primarily related to stock-based compensation.

As of March 31, 2018, the Company had $18.8 million of unrecognized tax benefits, $9.9 million of which would affect its effective tax rate if recognized after considering the valuation allowance. At December 31, 2017, the Company had $16.3 million of unrecognized tax benefits, $9.1 million of which would affect its effective tax rate if recognized after considering the valuation allowance. 

Uncertain tax positions relate to the allocation of income and deductions among the Company’s global entities and to the determination of the research and development tax credit. It is reasonably possible that over the next twelve-month period, the Company may experience increases or decreases in its unrecognized tax benefits. However, it is not possible to determine either the magnitude or the range of increases or decreases at this time.

The Company recognizes interest and penalties, if any, related to uncertain tax positions in its income tax provision. As of March 31, 2018 and December 31, 2017, the Company has $0.6 million and $0.5 million, respectively, of accrued interest related to uncertain tax positions, which were recorded in long-term income tax liabilities in the Consolidated Balance Sheets.

On July 27, 2015, in Altera Corp. v. Commissioner, the U.S. Tax Court issued an opinion related to the treatment of stock-based compensation expense in an intercompany cost-sharing arrangement. A final decision was issued in December 2015, and the IRS appealed the decision in February 2016. At this time, the U.S. Department of the Treasury has not withdrawn the requirement from its regulations to include stock-based compensation in the cost pool to be shared under a cost-sharing arrangement. Due to the uncertainty surrounding the status of the current regulations, questions related to the scope of potential benefits, and the risk of the Tax Court’s decision being overturned upon appeal, the Company has not recorded any adjustments as of March 31, 2018. The Company will continue to monitor developments related to this opinion and the potential impact on its financial statements.

14. ACCUMULATED OTHER COMPREHENSIVE INCOME

The following table summarizes the changes in accumulated other comprehensive income (in thousands):

The amounts reclassified from accumulated other comprehensive income were recorded in interest and other income, net, in the Condensed Consolidated Statements of Operations.

15. DIVIDENDS AND DIVIDEND EQUIVALENTS

Cash Dividend Program

In June 2014, the Board of Directors approved a dividend program pursuant to which the Company intends to pay quarterly cash dividends on its common stock. Based on the Company’s historical practice, stockholders of record as of the last business day of the quarter are entitled to receive the quarterly cash dividends when and if declared by the Board of Directors, which are payable to the stockholders in the following month. The Board of Directors declared the following cash dividends (in thousands, except per-share amounts): 

As of March 31, 2018 and December 31, 2017, accrued dividends totaled $12.6 million and $8.3 million, respectively.

The declaration of any future cash dividends is at the discretion of the Board of Directors and will depend on, among other things, the Company’s financial condition, results of operations, capital requirements, business conditions, statutory requirements of Delaware law, and other factors that the Board of Directors may deem relevant, as well as a determination that cash dividends are in the best interests of the stockholders.

The Company anticipates that cash used for future dividend payments will come from its current domestic cash and cash generated from ongoing U.S. operations. In addition, the Company currently plans to repatriate cash from its Bermuda subsidiary to fund future dividends and continue to indefinitely reinvest its earnings from other foreign subsidiaries. 

Cash Dividend Equivalent Rights

Under the Company’s stock plans, outstanding RSUs contain rights to receive cash dividend equivalents, which entitle employees who hold RSUs to the same dividend value per share as holders of common stock. The dividend equivalents are accumulated and paid to the employees when the underlying RSUs vest. Dividend equivalents accumulated on the underlying RSUs are forfeited if the employees do not fulfill their service requirement and the awards do not vest. As of March 31, 2018 and December 31, 2017, accrued dividend equivalents totaled $6.7 million and $5.8 million, respectively.