We are an independent designer, manufacturer and marketer of thermal, mechanical and electrical products that are primarily used by semiconductor manufacturers in conjunction with automatic test equipment ("ATE") in the testing of integrated circuits ("ICs" or "semiconductors"). We also market our thermal products in markets outside the ATE market, such as the automotive, consumer electronics, defense/aerospace, energy, industrial and telecommunications markets.

The consolidated entity is comprised of inTEST Corporation (parent) and our wholly-owned subsidiaries. During 2016, we reorganized our business from three product segments (Thermal Products, Mechanical Products and Electrical Products) into two product segments (inTEST Thermal Solutions ("iTS") and inTEST Electromechanical Semiconductor Products ("EMS")). Certain operational changes undertaken in the first quarter of 2016 in connection with this reorganization are discussed further in Note 3 of our consolidated financial statements included in our Annual Report on Form 10-K for the year ended December 31, 2016 filed with the Securities and Exchange Commission on March 27, 2017 (the "2016 Form 10-K"). Accordingly, effective January 1, 2017, we have two reportable segments, which are also our reporting units. Prior period information has been reclassified to be comparable to the presentation for 2017.We manufacture our products in the U.S. Marketing and support activities are conducted worldwide from our facilities in the U.S., Germany and Singapore.

The semiconductor market in which we operate is characterized by rapid technological change, competitive pricing pressures and cyclical as well as seasonal market patterns. This market is subject to significant economic downturns at various times. Our financial results are affected by a wide variety of factors, including, but not limited to, general economic conditions worldwide and in the markets in which we operate, economic conditions specific to the semiconductor market and the other markets we serve, our ability to safeguard patented technology and intellectual property in a rapidly evolving market, downward pricing pressures from customers, and our reliance on a relatively few number of customers for a significant portion of our sales. In addition, we are exposed to the risk of obsolescence of our inventory depending on the mix of future business and technological changes within the markets that we serve. We also continue to implement an acquisition strategy that may cause us to incur substantial expense in reviewing and evaluating potential transactions. We may or may not be successful in locating suitable businesses to acquire. In addition, if we are able to complete an acquisition, we may not be able to successfully integrate the acquired business with our existing business and we may not be able to operate the acquired business profitably. As a result of these or other factors, we may experience significant period-to-period fluctuations in future operating results.

Basis of Presentation and Use of Estimates

The accompanying consolidated financial statements include our accounts and those of our wholly-owned subsidiaries. All significant intercompany accounts and transactions have been eliminated upon consolidation. The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America ("U.S. GAAP") requires us to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. Certain of our accounts, including inventories, long-lived assets, goodwill, identifiable intangibles and deferred tax assets and liabilities, including related valuation allowances, are particularly impacted by estimates.

In the opinion of management, the accompanying unaudited consolidated financial statements include all adjustments (consisting only of normal recurring adjustments) necessary to present fairly the financial position, results of operations, and changes in cash flows for the interim periods presented. Certain footnote information has been condensed or omitted from these consolidated financial statements. Therefore, these consolidated financial statements should be read in conjunction with the consolidated financial statements and accompanying footnotes included in our 2016 Form 10-K.

Reclassification

Certain prior period amounts have been reclassified to be comparable with the current period's presentation.

Inventories

Inventories are valued at cost on a first-in, first-out basis, not in excess of market value. Cash flows from the sale of inventories are recorded in operating cash flows. On a quarterly basis, we review our inventories and record excess and obsolete inventory charges based upon our established objective excess and obsolete inventory criteria. These criteria identify material that has not been used in a work order during the prior twelve months and the quantity of material on hand that is greater than the average annual usage of that material over the prior three years. In certain cases, additional excess and obsolete inventory charges are recorded based upon current market conditions, anticipated product life cycles, new product introductions and expected future use of the inventory. The excess and obsolete inventory charges we record establish a new cost basis for the related inventories. We incurred excess and obsolete inventory charges of $47 and $69 for the three months ended March 31, 2017 and 2016, respectively.

Goodwill, Intangible and Long-Lived Assets

We account for goodwill and intangible assets in accordance with Accounting Standards Codification ("ASC") 350 (Intangibles - Goodwill and Other). Finite-lived intangible assets are amortized over their estimated useful economic life and are carried at cost less accumulated amortization. Goodwill is assessed for impairment annually in the fourth quarter on a reporting unit basis, or more frequently when events and circumstances occur indicating that the recorded goodwill may be impaired. As a part of the goodwill impairment assessment, we have the option to perform a qualitative assessment to determine whether it is more-likely-than-not that the fair value of a reporting unit is less than its carrying amount. If we determine this is the case, we are required to perform a two-step goodwill impairment test to identify potential goodwill impairment and measure the amount of goodwill impairment loss to be recognized. The two-step test is discussed below. If we determine that it is more-likely-than-not that the fair value of the reporting unit is greater than its carrying amounts, the two-step goodwill impairment test is not required.

If we determine it is more-likely-than-not that the fair value of a reporting unit is less than its carrying amount as a result of our qualitative assessment, we will perform a quantitative two-step goodwill impairment test. In the Step I test, the fair value of a reporting unit is computed and compared with its book value. If the book value of a reporting unit exceeds its fair value, a Step II test is performed in which the implied fair value of goodwill is compared with the carrying amount of goodwill. If the carrying amount of goodwill exceeds the implied fair value, an impairment loss is recorded in an amount equal to that excess. The two-step goodwill impairment assessment is based upon a combination of the income approach, which estimates the fair value of our reporting units based upon a discounted cash flow approach, and the market approach which estimates the fair value of our reporting units based upon comparable market multiples. This fair value is then reconciled to our market capitalization at year end with an appropriate control premium. The determination of the fair value of our reporting units requires management to make significant estimates and assumptions including the selection of appropriate peer group companies, control premiums, discount rate, terminal growth rates, forecasts of revenue and expense growth rates, income tax rates, changes in working capital, depreciation, amortization and capital expenditures. Changes in assumptions concerning future financial results or other underlying assumptions could have a significant impact on either the fair value of the reporting unit or the amount of the goodwill impairment charge.

Indefinite-lived intangible assets are assessed for impairment annually in the fourth quarter, or more frequently if events or changes in circumstances indicate that the asset might be impaired. As a part of the impairment assessment, we have the option to perform a qualitative assessment to determine whether it is more likely than not that an indefinite-lived intangible asset is impaired. If, as a result of our qualitative assessment, we determine that it is more-likely-than-not that the fair value of the indefinite-lived intangible asset is less than its carrying amount, the quantitative impairment test is required. Otherwise, no further testing is required. The quantitative impairment test consists of a comparison of the fair value of the intangible asset with its carrying amount. If the carrying amount of the intangible asset exceeds its fair value, an impairment loss is recognized in an amount equal to that excess.

Long-lived assets, which consist of finite-lived intangible assets and property and equipment, are assessed for impairment whenever events or changes in business circumstances indicate that the carrying amount of the assets may not be fully recoverable or that the useful lives of these assets are no longer appropriate. Each impairment test is based on a comparison of the estimated undiscounted cash flows to the recorded value of the asset. If impairment is indicated, the asset is written down to its estimated fair value. The cash flow estimates used to determine the impairment, if any, contain management's best estimates using appropriate assumptions and projections at that time.

Stock-Based Compensation

We account for stock-based compensation in accordance with ASC Topic 718 (Compensation - Stock Compensation) which requires that employee share-based equity awards be accounted for under the fair value method and requires the use of an option pricing model for estimating fair value of stock options granted, which is then amortized to expense over the service periods. See further disclosures related to our stock-based compensation plan in Note 7.

Subsequent Events

We have made an assessment of our operations and determined that there were no material subsequent events requiring adjustment to, or disclosure in, our consolidated financial statements for the three months ended March 31, 2017.

Revenue Recognition

We recognize revenue when persuasive evidence of an arrangement exists, delivery has occurred or services have been rendered, the price is fixed or determinable, and collection of the related receivable is reasonably assured. Sales of our products are made through our sales employees, third-party sales representatives and distributors. There are no differences in revenue recognition policies based on the sales channel. We do not provide our customers with rights of return or exchanges. Revenue is generally recognized upon product shipment. Our customers' purchase orders do not typically contain any customer-specific acceptance criteria, other than that the product performs within the agreed upon specifications. We test all products manufactured as part of our quality assurance process to determine that they comply with specifications prior to shipment to a customer. To the extent that any customer purchase order contains customer-specific acceptance criteria, revenue recognition is deferred until customer acceptance.

In addition, we lease certain of our equipment to customers under non-cancellable operating leases. These leases generally have an initial term of six months. We recognize revenue for these leases on a straight-line basis over the term of the lease.

With respect to sales tax collected from customers and remitted to governmental authorities, we use a net presentation in our consolidated statement of operations. As a result, there are no amounts included in either our net revenues or cost of revenues related to sales tax.

Product Warranties

We generally provide product warranties and record estimated warranty expense at the time of sale based upon historical claims experience. Warranty expense is included in selling expense in our consolidated financial statements. 

Income Taxes

The asset and liability method is used in accounting for income taxes. Under this method, deferred tax assets and liabilities are recognized for operating loss and tax credit carryforwards and for the future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax bases. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be recovered or settled. The effect on deferred tax assets and liabilities of a change in tax rates is recognized in the results of operations in the period that includes the enactment date. A valuation allowance is recorded to reduce the carrying amounts of deferred tax assets if it is more likely than not that such assets will not be realized.

Net Earnings Per Common Share

Net earnings per common share - basic is computed by dividing net earnings by the weighted average number of common shares outstanding during each period. Net earnings per common share - diluted is computed by dividing net earnings by the weighted average number of common shares and common share equivalents outstanding during each period. Common share equivalents represent unvested shares of restricted stock and stock options and are calculated using the treasury stock method. Common share equivalents are excluded from the calculation if their effect is anti-dilutive.

The table below sets forth, for the periods indicated, a reconciliation of weighted average common shares outstanding - basic to weighted average common shares and common share equivalents outstanding - diluted and the average number of potentially dilutive securities that were excluded from the calculation of diluted earnings per share because their effect was anti-dilutive:

In January 2017, the FASB issued amendments to clarify the current guidance on the definition of a business. The objective of the amendments is to assist entities with evaluating whether transactions should be accounted for as acquisitions (or disposals) of assets or businesses. The amendments are effective for us as of January 1, 2018, with early application permitted. We do not expect the implementation of these amendments to have a material impact on our consolidated financial statements.

In November 2016, the FASB issued amendments to the guidance on presentation of restricted cash within the statement of cash flows. The amendments require that restricted cash be included within cash and cash equivalents on the statement of cash flows. The amendments are effective for us as of January 1, 2018, and are to be applied retrospectively. Early application is permitted. We do not expect the implementation of these amendments to have a material impact on our consolidated financial statements.

In February 2016, the FASB issued amendments to the current guidance on accounting for lease transactions, which is presented in ASC Topic 842 (Leases). The intent of the updated guidance is to increase transparency and comparability among organizations by requiring lessees to recognize assets and liabilities on the balance sheet for the rights and obligations created by leases and to disclose key information about leasing arrangements. Under the new guidance, a lessee will be required to record a right-of-use asset and a lease liability on the balance sheet for all leases with terms longer than 12 months. Leases will be classified as either finance or operating, with classification affecting the pattern of expense recognition in the income statement. The amendments are effective for us as of January 1, 2019. A modified retrospective transition approach is required for lessees for capital and operating leases existing at, or entered into after, the beginning of the earliest comparative period presented in the financial statements, with certain practical expedients available. We are currently evaluating the impact of the implementation of these amendments on our consolidated financial statements.

In May 2014, the FASB issued new guidance on the recognition of revenue from contracts with customers. Subsequent to May, 2014, the FASB has issued additional clarifying guidance on certain aspects of this new guidance. This guidance is presented in ASC Topic 606 (Revenue from Contracts with Customers). This new guidance will replace most existing revenue recognition guidance in U.S. GAAP when it becomes effective. Companies can use either the retrospective or cumulative effect transition method. In August 2015, the FASB deferred the effective date of this new guidance for one additional year. As a result, this new guidance is effective for us as of January 1, 2018. Early application is only permitted as of the prior effective date, which in our case would be as of January 1, 2017. We currently plan to implement this new guidance on January 1, 2018 with a cumulative adjustment to retained earnings as opposed to retrospectively adjusting prior periods. During the fourth quarter of 2016, we completed a preliminary review of all our revenue streams to identify any differences in timing, measurement or presentation of revenue recognition. Our implementation process is ongoing; however, based on the results of our assessment to date, we currently do not expect the implementation of this new guidance to have a significant impact on the timing or amount of revenue we recognize in any given period in comparison to the amount recognized under current guidance.

Goodwill and intangible assets on our balance sheets are the result of our acquisitions of Sigma Systems Corp. ("Sigma") in October 2008 and Thermonics, Inc. ("Thermonics"), a division of Test Enterprises, Inc., in January 2012.

Goodwill

All of our goodwill is allocated to our iTS product segment. There was no change in the amount of the carrying value of goodwill for the three months ended March 31, 2017.

Intangible Assets

The following tables provide further detail about our intangible assets as of March 31, 2017 and December 31, 2016:

During the three months ended March 31, 2017, Texas Instruments Incorporated accounted for 13% of our consolidated net revenues. While both of our product segments sold to this customer, these revenues were primarily generated by our EMS product segment. During the three months ended March 31, 2017 and 2016, Hakuto Co., Ltd., one of our distributors, accounted for 13% and 15% of our consolidated net revenues, respectively. These revenues were generated by our iTS product segment. No other customers accounted for 10% or more of our consolidated net revenues during the three months ended March 31, 2017 and 2016.

Inventories held at March 31, 2017 and December 31, 2016 were comprised of the following:

Letters of Credit

We have issued letters of credit as the security deposits for certain of our domestic leases. These letters of credit are secured by pledged certificates of deposit which are classified as Restricted Certificates of Deposit on our balance sheets. The terms of our leases require us to renew these letters of credit at least 30 days prior to their expiration dates for successive terms of not less than one year until lease expiration. Our outstanding letters of credit at March 31, 2017 and December 31, 2016 consisted of the following:

As of March 31, 2017, we have unvested restricted stock awards and stock options granted under stock-based employee compensation plans that are described more fully in Note 12 to the consolidated financial statements in our 2016 Form 10-K.

As of March 31, 2017, total unrecognized compensation expense related to unvested restricted stock awards and stock options was $830. The weighted average period over which this expense is expected to be recognized is 3.1 years. The following table shows the allocation of the compensation expense we recorded during the three months ended March 31, 2017 and 2016, respectively, related to stock-based compensation:

On October 27, 2015, our Board of Directors authorized the repurchase of up to $5,000 of our common stock from time to time on the open market, in compliance with Rule 10b-18 under the Securities Exchange Act of 1934 (the "Exchange Act"), or in privately negotiated transactions (the "2015 Repurchase Plan"). Repurchases may also be made under trading plans entered into with RW Baird & Co. (each a "10b5-1 Plan"), which permits shares to be repurchased when we might otherwise be precluded from doing so under insider trading laws. The timing, price and amount of any shares repurchased under the 2015 Repurchase Plan is determined by our management, based on our evaluation of market conditions and other factors. To date, all purchases have been made in accordance with 10b5-1 Plans, including the 10b5-1 Plan that is currently in place which was entered into on August 8, 2016, and provided for purchases to be made so long as the price did not exceed a maximum price. Recently, the price of our shares has exceeded the cap. Management is considering new parameters for future purchases. The 2015 Repurchase Plan does not obligate us to repurchase any particular amount of common stock and may be suspended or discontinued at any time without prior notice. The 2015 Repurchase Plan is funded using our operating cash flow or available cash.

During the three months ended March 31, 2017 and 2016, we repurchased 13,883 and 114,688 shares under the 2015 Repurchase Plan, respectively. The total cost to repurchase these shares was $62 and $471, respectively. As of March 31, 2017, we had repurchased a total of 297,020 shares under the 2015 Repurchase Plan at a cost of $1,195. All of the repurchased shares were retired.

We have a defined contribution 401(k) plan for our employees who work in the U.S. All permanent employees of inTEST Corporation, Temptronic Corporation and inTEST Silicon Valley Corporation who are at least 18 years of age are eligible to participate in the plan. We match employee contributions dollar for dollar up to 10% of the employee's annual compensation, with a maximum limit of $5. Employer contributions vest ratably over four years. Matching contributions are discretionary. For the three months ended March 31, 2017 and 2016, we recorded $163 and $160 of expense for matching contributions, respectively.

As discussed in Note 1, during 2016, we reorganized our business from three product segments (Thermal Products, Mechanical Products and Electrical Products) into two product segments (iTS and EMS). Accordingly, effective January 1, 2017, we have two reportable segments, which are also our reporting units. Prior period information has been reclassified to be comparable to the presentation for 2017.

iTS includes the operations of Temptronic Corporation, Thermonics, Sigma, inTEST Thermal Solutions GmbH (Germany), and inTEST Pte, Limited (Singapore). Sales of this segment consist primarily of temperature management systems which we design, manufacture and market under our Temptronic, Thermonics and Sigma product lines. In addition, this segment provides post-warranty service and support.

EMS includes the operations of our manufacturing facilities in Mt. Laurel, New Jersey and Fremont, California. Sales of this segment consist primarily of manipulator, docking hardware and tester interface products, which we design, manufacture and market.

We operate our business worldwide, and both segments sell their products both domestically and internationally. Both segments sell to semiconductor manufacturers, third-party test and assembly houses and ATE manufacturers. iTS also sells into a variety of markets outside of the ATE market, including the automotive, consumer electronics, defense/aerospace, energy, industrial and telecommunications markets.

Risk Factors and Forward-Looking Statements

In addition to historical information, this discussion and analysis contains statements relating to possible future events and results that are considered "forward-looking statements" within the meaning of the Private Securities Litigation Reform Act of 1995. These statements can often be identified by the use of forward-looking terminology such as "believes," "expects," "intends," "may," "will," "should" or "anticipates" or similar terminology. See Part I, Item 1 - "Business - Cautionary Statement Regarding Forward-Looking Statements" in our 2016 Form 10-K for examples of statements made in this report which may be "forward-looking statements." These statements involve risks and uncertainties and are based on various assumptions. Although we believe that our expectations are based on reasonable assumptions, investors and prospective investors are cautioned that such statements are only projections, and there cannot be any assurance that these events or results will occur.

Information about the primary risks and uncertainties that could cause our actual future results to differ materially from our historic results or the results described in the forward-looking statements made in this report or presented elsewhere by Management from time to time are included in Part I, Item 1A - "Risk Factors" in our 2016 Form 10-K. Material changes to such risk factors may be reported in subsequent Quarterly Reports on Form 10-Q in Part II, Item 1A. There have been no such changes from the risk factors set forth in our 2016 Form 10-K. 

Overview

This MD&A should be read in conjunction with the accompanying consolidated financial statements.

Our business and results of operations are substantially dependent upon the demand for ATE by semiconductor manufacturers and companies that specialize in the testing of ICs. Demand for ATE is driven by semiconductor manufacturers that are opening new, or expanding existing, semiconductor fabrication facilities or upgrading existing equipment, which in turn is dependent upon the current and anticipated market demand for semiconductors and products incorporating semiconductors. Such market demand can be the result of market expansion, development of new technologies or redesigned products to incorporate new features, or the replacement of aging equipment. In addition, we continue to focus on design improvements and new approaches for our own products which contribute to our net revenues as our customers adopt these new products.

In the past, the semiconductor industry has been highly cyclical with recurring periods of oversupply, which often have a severe impact on the semiconductor industry's demand for ATE, including the products we manufacture. This can cause wide fluctuations in both our orders and net revenues and, depending on our ability to react quickly to these shifts in demand, can significantly impact our results of operations. ATE market cycles are difficult to predict and in recent years have become more volatile and, in certain cases, shorter in duration. Because the market cycles are generally characterized by sequential periods of growth or declines in orders and net revenues during each cycle, year over year comparisons of operating results may not always be as meaningful as comparisons of periods at similar points in either up or down cycles. In addition, during both downward and upward cycles in our industry, in any given quarter, the trend in both our orders and net revenues can be erratic. This can occur, for example, when orders are canceled or currently scheduled delivery dates are accelerated or postponed by a significant customer or when customer forecasts and general business conditions fluctuate during a quarter.

In addition to being cyclical, the ATE market has also developed a seasonal pattern in the last several years, with the second and third quarters being the periods of strong demand and the first and fourth quarters being periods of weakened demand. We believe this change has been driven by the strong demand for consumer products containing semiconductor content sold during the year-end holiday shopping season.

Third-party market share statistics are not available for the products we manufacture and sell into the ATE market; therefore, comparisons of period over period changes in our market share are not easily determined. As a result, it is difficult to ascertain if ATE market volatility in any period is the result of macro-economic or customer-specific factors impacting ATE market demand, or if we have gained or lost market share to a competitor during the period.

As part of our ongoing strategy to reduce the impact of ATE market volatility on our business operations, we continue to diversify our served markets to address the thermal test requirements of several other markets outside the ATE market. These include the automotive, consumer electronics, defense/aerospace, energy, industrial and telecommunications markets. We believe that these markets usually are less cyclical than the ATE market. While market share statistics exist for some of the markets we serve outside the ATE market, due to the nature of our highly specialized product offerings in these non-ATE markets, we do not expect broad market penetration in many of these markets and, therefore, do not anticipate developing meaningful market shares in these non-ATE markets. In addition, our orders and net revenues in any given period in these markets do not necessarily reflect the overall trends in these non-ATE markets due to our limited market shares. Consequently, we are continuing to evaluate buying patterns and opportunities for growth in these non-ATE markets that may affect our performance. The level of our orders and net revenues from these non-ATE markets has varied in the past, and we expect will vary significantly in the future, as we work to build our presence in these markets and establish new markets for our products.

While the majority of our orders and net revenues are derived from the ATE market, our operating results do not always follow the overall trend in the ATE market in any given period. We believe that these anomalies may be driven by a variety of factors within the ATE market, including, for example, changing product requirements, longer time periods between new product offerings by original equipment manufacturers ("OEMs") and changes in customer buying patterns. In particular, demand for our mechanical and electrical products, which are sold exclusively within the ATE market, and our operating margins in these product segments have been affected by shifts in the competitive landscape, including (i) customers placing heightened emphasis on shorter lead times (which places increased demands on our available engineering and production capacity increasing unit costs) and ordering in smaller quantities (which prevents us from acquiring component materials in larger volumes at lower cost and increasing unit costs), (ii) the practice of OEMs specifying other suppliers as primary vendors, with less frequent opportunities to compete for such designations, (iii) the in-house manufacturing activities of OEMs building certain products we have historically sold to them, including manipulators and docking hardware, which has had the impact of significantly reducing the size of the available market for those certain products (iv) the role of third-party test and assembly houses in the ATE market and their requirement of products with a greater range of use at the lowest cost, (v) customer supply chain management groups demanding lower prices and spreading purchases across multiple vendors, and (vi) certain competitors aggressively reducing their products' sales prices (causing us to either reduce our products' sales price to be successful in obtaining the sale or causing loss of the sale).

In addition, in recent periods we have seen instances where demand for ATE is not consistent for each of our product segments or for any given product within a particular product segment. This inconsistency in demand for ATE can be driven by a number of factors, but in most cases, we have found that the primary reason is unique customer-specific changes in demand for certain products driven by the needs of their customers or markets served. These shifts in market practices and customer-specific needs have had, and may continue to have, varying levels of impact on our operating results and are difficult to quantify or predict from period to period. Management has taken, and will continue to take, such actions it deems appropriate to adjust our strategies, products and operations to counter such shifts in market practices as they become evident.

Orders and Backlog

The following table sets forth, for the periods indicated, a breakdown of the orders received by product segment and market.

Total consolidated orders for the quarter ended March 31, 2017 were $15.0 million compared to $9.8 million for the same period in 2016 and $11.6 million for the quarter ended December 31, 2016. This increase reflects higher levels of demand from both ATE and non-ATE market customers. The increase from ATE market customers reflects, in part, demand driven by the increasing number of ICs utilized in the automotive industry and the need to test those ICs. In addition, demand for ATE is also being driven by products which enable the Internet of Things (IoT) and the increasing number of ICs in consumer electronics and industrial applications.

The increase in demand from non-ATE markets primarily reflects higher levels of orders from certain of our customers in the telecommunications market. Our orders from the telecommunications market increased 128% in the first quarter of 2017 as compared to the same period in 2016 and primarily reflect increased demand from the manufacturers of optical transceiver products. To a lesser extent there were also increases in demand from the defense/aerospace and automotive markets. As a percent of our total consolidated orders, orders from non-ATE markets were 23% in the first quarter of 2017 compared to 20% for the same period in 2016 and 27% for the fourth quarter of 2016. The level of our orders in these non-ATE markets has varied in the past, and we expect it will vary significantly in the future as we build our presence in these markets and establish new markets for our products.

At March 31, 2017, our backlog of unfilled orders for all products was approximately $8.2 million compared with approximately $3.5 million at March 31, 2016 and $7.4 million at December 31, 2016. Our backlog includes customer orders which we have accepted, substantially all of which we expect to deliver in 2017. While backlog is calculated on the basis of firm purchase orders, a customer may cancel an order or accelerate or postpone currently scheduled delivery dates. Our backlog may be affected by the tendency of customers to rely on short lead times available from suppliers, including us, in periods of depressed demand. In periods of increased demand, there is a tendency towards longer lead times that has the effect of increasing backlog. As a result, our backlog at a particular date is not necessarily indicative of sales for any future period.

Net Revenues

The following table sets forth, for the periods indicated, a breakdown of the net revenues by product segment and market.

We sell most of our products to semiconductor manufacturers and third-party test and assembly houses (end user sales) and to ATE manufacturers (OEM sales) who ultimately resell our equipment with theirs to both semiconductor manufacturers and third-party test and assembly houses. Our Thermal Products segment also sells into a variety of other markets, including the automotive, consumer electronics, defense/aerospace, energy, industrial and telecommunications markets. The mix of customers during any given period will affect our gross margin due to differing sales discounts and commissions. For the quarters ended March 31, 2017 and 2016, our OEM sales as a percentage of net revenues were 12% and 6%, respectively.

OEM sales generally have a lower gross margin than end user sales, as OEM sales historically have had a more significant discount. Our current net operating margins on most OEM sales, however, are only slightly less than margins on end user sales because of the payment of third party sales commissions on most end user sales. We have also continued to experience demands from our OEM customers' supply chain managers to reduce our sales prices to them. If we cannot further reduce our manufacturing and operating costs, these pricing pressures will negatively affect our gross and operating margins.

Results of Operations

The results of operations for our two product segments are generally affected by the same factors. Separate discussions and analyses for each product segment would be repetitive. The discussion and analysis that follows, therefore, is presented on a consolidated basis and includes discussion of factors unique to each product segment where significant to an understanding of that segment.

Quarter Ended March 31, 2017 Compared to Quarter Ended March 31, 2016

Net Revenues. Net revenues were $14.2 million for the quarter ended March 31, 2017 compared to $8.6 million for the same period in 2016, an increase of $5.5 million, or 64%. We believe the increase in our net revenues during the first quarter of 2017 primarily reflects the factors previously discussed in the Overview.

Gross Margin. Our consolidated gross margin was 55% for the quarter ended March 31, 2017 as compared to 47% for the same period in 2016. Although our fixed operating costs increased $102,000 in absolute dollar terms, they were more fully absorbed due to the higher net revenue levels and, as a result, represented 10% of our net revenues for the first quarter of 2017 as compared to 16% for the same period in 2016. The $102,000 increase in the absolute dollar value of these costs primarily reflects higher salary and benefits expense for iTS as a result of an increased use of temporary labor for operations support due to the increased order and shipment activity.

Selling Expense. Selling expense was $1.7 million for the quarter ended March 31, 2017 compared to $1.3 million for the same period in 2016, an increase of $333,000, or 25%. The increase primarily reflects higher levels of commission expense reflecting the higher net revenues, and to a lesser extent, an increase in travel expense for iTS.

Engineering and Product Development Expense. Engineering and product development expense was $935,000 for the first quarter of 2017 compared to $991,000 for the same period in 2016, a decrease of $56,000, or 6%. The decrease in engineering and product development expense primarily reflects decreased spending on materials used in new product development for iTS.

General and Administrative Expense. General and administrative expense was $2.0 million for the first quarter of 2017 compared to $1.6 million for the same period in 2016, an increase of $349,000, or 21%. The increase primarily reflects higher salary and benefits expense and an increase in accruals for profit related bonuses. To a lesser extent there was also an increase in travel costs and professional fees.

Income Tax Expense. For the quarter ended March 31, 2017, we recorded income tax expense of $1.1 million compared to $43,000 for the same period in 2016. Our effective tax rate was 35% in each of the quarters ended March 31, 2017 and 2016. On a quarterly basis, we record income tax expense or benefit based on the expected annualized effective tax rate for the various taxing jurisdictions in which we operate our businesses.

Liquidity and Capital Resources

As discussed more fully in the Overview, our business and results of operations are substantially dependent upon the demand for ATE by semiconductor manufacturers and companies that specialize in the testing of ICs. The cyclical and volatile nature of demand for ATE makes estimates of future revenues, results of operations and net cash flows difficult.

Our primary historical source of liquidity and capital resources has been cash flow generated by our operations and we manage our businesses to maximize operating cash flows as our primary source of liquidity. We use cash to fund growth in our operating assets, for new product research and development, for acquisitions and for stock repurchases.

Liquidity

Our cash and cash equivalents and working capital were as follows:

Critical Accounting Policies

The preparation of consolidated financial statements in conformity with accounting principles generally accepted in the United States of America requires us to make estimates and judgments that affect the reported amounts of assets, liabilities, revenues, expenses and related disclosure of contingent assets and liabilities. On an on-going basis, we evaluate our estimates, including those related to inventories, long-lived assets, goodwill, identifiable intangibles and deferred income tax valuation allowances. We base our estimates on historical experience and on appropriate and customary assumptions that we believe to be reasonable under the circumstances, the results of which form the basis for making judgments about the carrying values of assets and liabilities that are not readily apparent from other sources. Some of these accounting estimates and assumptions are particularly sensitive because of their significance to our consolidated financial statements and because of the possibility that future events affecting them may differ markedly from what had been assumed when the financial statements were prepared. As of March 31, 2017, there have been no significant changes to the accounting policies that we have deemed critical. These policies are more fully described in our 2016 Form 10-K.

Off -Balance Sheet Arrangements

There were no off-balance sheet arrangements during the three months ended March 31, 2017 that have or are reasonably likely to have, a current or future effect on our financial condition, changes in financial condition, revenues or expenses, results of operations, liquidity, capital expenditures or capital resources that is material to our interests.

This disclosure is not required for a smaller reporting company.

Evaluation of Disclosure Controls and Procedures

We maintain disclosure controls and procedures, as such term is defined in Rule 13a-15(e) under the Securities Exchange Act of 1934 (the "Exchange Act"). Because there are inherent limitations in all control systems, a control system, no matter how well conceived and operated, can provide only reasonable, as opposed to absolute, assurance that the objectives of the control system are met. These inherent limitations include the realities that judgments in decision-making can be faulty, and that breakdowns can occur because of simple error or mistake. Additionally, controls can be circumvented by the individual acts of some persons, by collusion of two or more people, or by management override of the control. Further, the design of a control system must reflect the fact that there are resource constraints, and the benefits of controls must be considered relative to their costs. Our management, including our Chief Executive Officer ("CEO") and Chief Financial Officer ("CFO"), does not expect that our disclosure controls and procedures or our internal control over financial reporting will prevent all error and all fraud. Because of the inherent limitations in a cost-effective control system, misstatements due to error or fraud may occur and not be detected. Accordingly, our management has designed the disclosure controls and procedures to provide reasonable assurance that the objectives of the control system were met.

CEO/CFO Conclusions about the Effectiveness of the Disclosure Controls and Procedures. As required by Rule 13a-15(b), inTEST management, including our CEO and CFO, conducted an evaluation as of the end of the period covered by this Report, of the effectiveness of our disclosure controls and procedures. Based on that evaluation, our CEO and CFO concluded that, as of the end of the period covered by this Report, our disclosure controls and procedures were effective at the reasonable assurance level.

Changes in Internal Control Over Financial Reporting

During the period covered by this Report, there has been no change in our internal control over financial reporting (as defined in Rules 13a-15(f) and 15d-15(f) under the Exchange Act) that occurred during the period covered by this Report that has materially affected, or is reasonably likely to materially affect, our internal control over financial reporting.

From time to time we may be a party to legal proceedings occurring in the ordinary course of business. We are not currently involved in any material legal proceedings.

Information regarding the primary risks and uncertainties that could materially and adversely affect our future performance or could cause actual results to differ materially from those expressed or implied in our forward-looking statements, appears in Part I, Item 1A -- "Risk Factors" of our Annual Report on Form 10-K for the year ended December 31, 2016 filed with the Securities and Exchange Commission on March 27, 2017.

The following table provides information with respect to purchases made by us, or on our behalf, of our common stock during the three months ended March 31, 2017:

None.

Not applicable.

None.

A list of the Exhibits which are required by Item 601 of Regulation S-K and filed with this Report is set forth in the Index to Exhibits immediately following the signature page, which Index to Exhibits is incorporated herein by reference.

        (a)  Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

        (b)  Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

        (c)  Evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

        (d)  Disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the registrant's most recent fiscal quarter (the registrant's fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant's internal control over financial reporting; and

        (a)  All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant's ability to record, process, summarize and report financial information; and

        (b)  Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting.

        (a)  Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

        (b)  Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

        (c)  Evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

        (d)  Disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the registrant's most recent fiscal quarter (the registrant's fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant's internal control over financial reporting; and

        (a)  All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant's ability to record, process, summarize and report financial information; and

        (b)  Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting.