Table of Contents

UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
_____________

FORM 10-Q
_____________

(Mark One)
☒  QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the quarterly period ended March 31, 2018 or

☐  TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the transition period from __________________ to ___________________

Commission File Number 1-36117

inTEST Corporation
(Exact Name of Registrant as Specified in its Charter)

804 East Gate Drive, Suite 200
Mt. Laurel, New Jersey 08054
(Address of principal executive offices, including zip code)

(856) 505-8800
(Registrant's Telephone Number, including Area Code)
_________________

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.
YES ☒      NO ☐

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (SS 232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files).
YES ☒      NO ☐

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, smaller reporting company or an emerging growth company. See the definitions of "large accelerated filer," "accelerated filer" "smaller reporting company," and "emerging growth company" in Rule 12b-2 of the Exchange Act.

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐ 

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).
YES ☐      NO ☒

Number of shares of Common Stock, $.01 par value, outstanding as of the close of business on April 30, 2018:

10,473,558

inTEST CORPORATION

INDEX

We are an independent designer, manufacturer and marketer of thermal management products and semiconductor automated test equipment (“ATE”) interface solutions. Our products are used by semiconductor manufacturers to perform development, qualifying and final testing of integrated circuits (“ICs”) and wafers, and for other electronic testing across a range of industries including the automotive, defense/aerospace, energy, industrial and telecommunications markets. We also offer induction heating products for joining and forming metals in a variety of industrial markets, including automotive, aerospace, machinery, wire & fasteners, medical, semiconductor, food & beverage, and packaging. We manufacture our products in the U.S. Marketing and support activities are conducted worldwide from our facilities in the U.S., Germany, Singapore, the Netherlands and the U.K. The consolidated entity is comprised of inTEST Corporation and our wholly-owned subsidiaries. We have two reportable segments, which are also our reporting units, Thermal Products ("Thermal") and Electromechanical Semiconductor Products ("EMS").

On May 24, 2017, we completed the acquisition of Ambrell Corporation ("Ambrell"). The acquisition was completed by acquiring all of the outstanding capital stock of Ambrell. Ambrell is a manufacturer of precision induction heating systems which are used to conduct fast, efficient, repeatable non-contact heating of metals or other electrically conductive materials, in order to transform raw materials into finished parts. The Ambrell acquisition complements our current thermal technologies and broadens our diverse customer base, allowing expansion within many non-semiconductor related markets, such as consumer product packaging, fiber-optics, automotive and other markets. Ambrell's operations are included in our Thermal segment. Ambrell manufactures its products in the U.S. and conducts marketing and support activities from its facilities in the U.S., the Netherlands and the U.K. This acquisition is discussed further in Note 3.

The ATE 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 ATE 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, we may not be able to successfully integrate any business we do acquire 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, contingent consideration liabilities 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 Form 10-K for the year ended December 31, 2017 (“2017 Form 10-K”) filed on March 28, 2018 with the Securities and Exchange Commission.
 

Reclassification

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

Business Combinations

Acquired businesses are accounted for using the purchase method of accounting, which requires that the purchase price be allocated to the net assets acquired at their respective fair values. Any excess of the purchase price over the estimated fair values of the net assets acquired is recorded as goodwill. Fair values of intangible assets are estimated by valuation models prepared by our management and third party advisors. The assets purchased and liabilities assumed have been reflected in our consolidated balance sheets, and the results are included in the consolidated statements of operations and consolidated statements of cash flows from the date of acquisition. Any change in the fair value of acquisition-related contingent consideration subsequent to the acquisition date, including changes from events after the acquisition date, will be recognized within general and administrative expense in the period of the estimated fair value change. Acquisition-related transaction costs, including legal and accounting fees and other external costs directly related to the acquisition, are recognized separately from the acquisition and expensed as incurred in general and administrative expense in the consolidated statements of operations.

Fair Value Measurements

The fair values of our financial instruments reflect the amounts that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date (exit price).

The carrying amounts of our financial instruments of cash and cash equivalents, accounts receivable, accounts payable and accrued liabilities approximate fair value due to their short maturities.

We carry our contingent consideration liability at fair value. In accordance with the three-tier fair value hierarchy, we determined the fair value of our contingent consideration liability using an option-based income approach with a Monte Carlo simulation model. The income approach uses Level 3, or unobservable inputs, as defined under the accounting guidance for fair value measurements. See Notes 3 and 4 for more information regarding our contingent consideration liability.

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 the qualitative assessment indicates a potential impairment, 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, and 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. If we choose not to perform a qualitative assessment, then the quantitative impairment test 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.

Revenue Recognition

As discussed further under “Effect of Recently Adopted Amendments to Authoritative Accounting Guidance” below, effective January 1, 2018, we recognize revenue in accordance with the guidance in ASC Topic 606 (Revenue from Contracts with Customers). We recognize revenue for the sale of products or services when our performance obligations under the terms of a contract with a customer are satisfied and control of the product or service has been transferred to the customer. Generally this occurs when we ship a product or perform a service. In certain cases, recognition of revenue is deferred until the product is received by the customer or at some other point in the future when we have determined that we have satisfied our performance obligations under the contract. Our contracts with customers may include a combination of products and services, which are generally capable of being distinct and accounted for as separate performance obligations. In addition to the sale of products and services, we also lease certain of our equipment under short-term lease agreements. We recognize revenue from equipment leases on a straight-line basis over the lease term.

Revenue is recorded in an amount that reflects the consideration we expect to receive in exchange for those products or services. We do not have any material variable consideration arrangements or any material payment terms with our customers other than standard net 30 or net 60 day payment terms. We generally do not provide a right of return to our customers. Revenue is recognized net of any taxes collected from customers, which are subsequently remitted to governmental authorities.

Nature of Products and Services

We sell thermal management products and semiconductor ATE interface solutions. Our thermal management products include ThermoStreams, ThermoChambers, ThermoChucks and process chillers which we sell under our Temptronic, Sigma and Thermonics product lines, and Ambrell’s precision induction heating systems, including EkoHeat and EasyHeat products. Our semiconductor ATE interface solutions include manipulators, docking hardware and electrical interface products. We provide post-warranty service for the equipment we sell. We sell semiconductor ATE interface solutions and certain thermal management products to the ATE market, which provides automated test equipment to the semiconductor market. We also sell our thermal products to markets outside the semiconductor market which include the automotive, defense/aerospace, industrial, telecommunications and other markets.

We lease certain of our equipment under short-term leasing agreements with original lease terms of 6 months or less. Our lease agreements do not contain purchase options.

Types of Contracts with Customers

Our contracts with customers are generally structured as individual purchase orders which specify the exact products or services being sold or equipment being leased along with the selling price, service fee or monthly lease amount for each individual item on the purchase order. Payment terms and any other customer-specific acceptance criteria are also specified on the purchase order. We generally do not have 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.

Contract Balances

We record accounts receivable at the time of invoicing. Accounts receivable, net of the allowance for doubtful accounts, is included in current assets on our balance sheet. To the extent that we do not recognize revenue at the same time as we invoice, we record a liability for deferred revenue. In certain instances, we also receive customer deposits in advance of invoicing and recording of accounts receivable. Deferred revenue and customer deposits are included in current liabilities on our balance sheets.

The allowance for doubtful accounts reflects our best estimate of probable losses inherent in the accounts receivable balance. We determine the allowance based on known troubled accounts, if any, historical experience, and other currently available evidence.

Costs to Obtain a Contract with a Customer

The only costs we incur associated with obtaining contracts with customers are sales commissions that we pay to our internal sales personnel or third-party sales representatives. These costs are calculated based on an established percentage of the selling price of each product or service sold. Commissions are considered earned by our internal sales personnel either at the time of receipt of our customer’s purchase order, in the case of Ambrell, or at the time we recognize revenue for a particular transaction, in the case of our remaining operations. Commissions are considered earned by third-party sales representatives at the time that revenue is recognized for a particular transaction. We record commission expense in our consolidated statements of operations at the time the commission is earned. Commissions earned but not yet paid are included in current liabilities on our balance sheets.

Refer to Notes 6 and 12 for further information about our revenue from contracts with customers.

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 $61 and $47 for the three months ended March 31, 2018 and 2017, respectively.

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 10.

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, 2018.

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 statements of operations. 

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:

Effect of Recently Adopted Amendments to Authoritative Accounting Guidance

In May 2014, the FASB issued new guidance on the recognition of revenue from contracts with customers. Subsequent to May 2014, the FASB issued additional clarifying guidance on certain aspects of this new guidance. This new guidance is presented in ASC Topic 606 (Revenue from Contracts with Customers) and replaced most existing revenue recognition guidance in U.S. GAAP when it became effective, which for us was on January 1, 2018. During the fourth quarter of 2017, we completed our review of all our revenue streams to identify any differences in timing, measurement or presentation of revenue recognition. This review included the types of revenue arrangements currently in place including a review of individual customer contracts related to each of our major revenue streams. Based on the results of our assessment, we concluded that the implementation of this new guidance would not have a significant impact on the timing or amount of revenue we recognize in any given period in comparison to the amount recognized under prior guidance. In addition, based on our assessment, we determined that we did not need to implement any major changes to existing accounting systems or internal controls. We adopted this guidance as of January 1, 2018 using the modified retrospective method which allowed us to make a cumulative adjustment to retained earnings for any differences in the amounts of revenue or expenses that would have been recognized in prior periods, had this new guidance been in place at that time, rather than retrospectively adjusting those prior periods. However, the implementation of this new guidance did not have any impact on our results of operations or our consolidated balance sheet as of the implementation date, as the timing and amount of revenue we recognized in prior periods did not change under the new guidance. See Notes 6 and 12 for additional disclosures about our revenue from contracts with customers.

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 were effective for us as of January 1, 2018, and have been applied retrospectively. The implementation of these amendments did not have a material impact on our consolidated financial statements.

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 were effective for us as of January 1, 2018. The implementation of these amendments did not have a material impact on our consolidated financial statements.

In May 2017, the FASB issued amendments to the guidance on accounting for a change to the terms or conditions (modification) of a share-based payment award. The amendments provide that an entity should account for the effects of a modification unless the fair value and vesting conditions of the modified award and the classification of the modified award (equity or liability instrument) are the same as the original award immediately before the modification. The amendments were effective for us as of January 1, 2018. The amendments are to be applied prospectively to an award modified on or after the adoption date. The implementation of these amendments did not have a material impact on our consolidated financial statements.

Effect of Recently Issued Amendments to Authoritative Accounting Guidance

In January 2017, the FASB issued amendments to the guidance on accounting for goodwill impairment. The amendments simplify the accounting for goodwill impairment by removing Step II of the goodwill impairment test, which requires a hypothetical purchase price allocation. Under the amendments, 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. The amendments will be applied prospectively and are effective for us as of January 1, 2020, with early application permitted beginning January 1, 2017. 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). Subsequent to February 2016, the FASB has issued additional clarifying guidance on certain aspects of this new guidance. 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. During the fourth quarter of 2017, we performed a preliminary assessment of the impact that the implementation of this guidance will have on our consolidated financial statements. Our assessment is ongoing. We currently expect that the implementation of this new guidance will have a significant impact on our consolidated balance sheet as a result of recording right-of-use assets and lease liabilities for all of our multi-year leases. Under current guidance, none of these leases has any related asset or liability recorded on our balance sheet. We do not currently expect that the implementation of this new guidance will have a significant impact on our pattern of expense recognition for any of our multi-year leases. However, we are still in the process of completing our assessment and our conclusions about the impact that this new guidance will have on our consolidated financial statements may change as we complete our assessment over the next several quarters.

On May 24, 2017, we completed our acquisition of Ambrell, a manufacturer of precision induction heating systems. Ambrell's systems are used to conduct fast, efficient, repeatable non-contact heating of metals or other electrically conductive materials, in order to transform raw materials into finished parts. The Ambrell acquisition complements our current thermal technologies and broadens our diverse customer base, allowing expansion within many non-semiconductor related markets, such as consumer product packaging, fiber-optics, automotive and other markets.

The purchase price for Ambrell was $22,000 in cash paid at closing, subject to a customary post-closing working capital adjustment. Additional consideration in the form of earnouts may be paid based upon a multiple of adjusted EBITDA for 2017 and 2018, as further discussed below. The acquisition was completed by acquiring all of the outstanding capital stock of Ambrell. Total acquisition costs incurred to complete this transaction were $935. Acquisition costs were expensed as incurred and included in general and administrative expense.

The acquisition of Ambrell has been accounted for as a business combination using purchase accounting, and, accordingly, the results of Ambrell have been included in our consolidated results of operations from the date of acquisition. The allocation of the Ambrell purchase price was based on fair values as of May 24, 2017. The determination of fair value reflects our estimates and assumptions based on the information available as of the date the estimate is calculated.

The excess of the purchase price over the identifiable intangible and net tangible assets was allocated to goodwill and is not deductible for tax purposes. Goodwill is attributed to synergies that are expected to result from the operations of the combined businesses.

The total purchase price of $26,733 was comprised of:

As noted above, the consideration paid for the acquisition of Ambrell includes contingent consideration in the form of earnouts based on the future adjusted EBITDA of Ambrell. Adjusted EBITDA is earnings (or loss) from operations before interest expense, benefit or provision for income taxes, depreciation and amortization, and excludes other non-recurring income and expense items as defined in the stock purchase agreement for Ambrell. The first earnout, to be paid after calendar year 2017 was completed, was an amount equal to 8x Ambrell's adjusted EBITDA for 2017 minus the $22,000 paid at closing. At March 31, 2018, we had accrued $5,833 as earnout payable representing the amount of the first earnout. This amount was paid in April 2018. The second earnout, if any, to be paid after calendar year 2018 is completed, will be an amount equal to 8x Ambrell's adjusted EBITDA for 2018 minus the sum of the $22,000 paid at closing and $5,833, the earnout paid with respect to 2017. The 2017 and 2018 earnouts, in the aggregate, are capped at $18,000. To estimate the fair value of the contingent consideration at the acquisition date and at the end of each quarter, an option based income approach using a Monte Carlo simulation model is utilized due to the non-linear payout structure. As of the acquisition date, this resulted in an estimated fair value of $4,123 for the 2017 and 2018 earnouts. This amount was recorded as a contingent consideration liability and included in the purchase price as of the acquisition date. At March 31, 2018, this same approach resulted in an estimated fair value of $6,992 for the 2018 earnout which is recorded as a contingent consideration liability on our balance sheet. Changes in the amount of the estimated fair value of the earnouts since the acquisition date are recorded as operating expenses in our statement of operations in the quarter in which they occur.

The total purchase price of $26,733 has been allocated as follows:

We estimated the fair value of identifiable intangible assets acquired using a combination of the income, cost and market approaches. Identifiable intangible assets acquired include customer relationships, customer backlog, technology and trademarks. We generally amortize our finite-lived intangible assets over their estimated useful lives on a straight-line basis, unless an alternate amortization method can be reliably determined. Any such alternate amortization method would be based on the pattern in which the economic benefits of the intangible asset are expected to be consumed.

The following table summarizes the estimated fair value of Ambrell's identifiable intangible assets and their estimated useful lives as of the acquisition date:

The following unaudited pro forma information gives effect to the acquisition of Ambrell as if the acquisition occurred on January 1, 2017. This proforma summary information does not reflect any operating efficiencies or costs savings that may be achieved by the combined businesses. It is presented for informational purposes only and is not necessarily indicative of what the actual results of operations would have been had the acquisition taken place as of that date, nor is it indicative of future consolidated results of operations:

The pro forma results shown above do not reflect the impact on general and administrative expense of investment advisory costs, legal costs and other costs of $935 incurred by us as a direct result of the transaction.

ASC Topic 820 (Fair Value Measurement) establishes a fair value hierarchy for instruments measured at fair value that distinguishes between assumptions based on market data (observable inputs) and our own assumptions (unobservable inputs). Observable inputs are inputs that market participants would use in pricing the asset or liability based on market data obtained from sources independent of us. Unobservable inputs are inputs that reflect our assumptions about the inputs that market participants would use in pricing the asset or liability, and are developed based on the best information available in the circumstances.

ASC 820 identifies fair value as the exchange price, or exit price, representing the amount that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants. As a basis for considering market participant assumptions in fair value measurements, ASC 820 establishes a three-tier fair value hierarchy that distinguishes among the following:

To the extent that the valuation is based on models or inputs that are less observable or unobservable in the market, the determination of fair value requires more judgment. Accordingly, the degree of judgment exercised by us in determining fair value is greatest for instruments categorized in Level 3. A financial instrument's level within the fair value hierarchy is based on the lowest level of any input that is significant to the fair value measurement.

Recurring Fair Value Measurements

The contingent consideration liability on our balance sheets is measured at fair value on a recurring basis using Level 3 inputs. Our contingent consideration liability is a result of our acquisition of Ambrell on May 24, 2017, and it represents the estimated fair value of the additional cash consideration payable that is contingent upon the achievement of certain financial results by Ambrell in 2018, as discussed more fully in Note 3. The fair value of this Level 3 instrument involves generating various scenarios for projected adjusted EBITDA over a specified time period, calculating the associated contingent consideration payments and discounting the average payments to present value. During the first quarter of 2018, we recorded a $1,726 increase in the fair value of our contingent consideration liability, primarily as a result of an increase in the projected adjusted EBITDA of Ambrell for the year ended December 31, 2018.

The following fair value hierarchy table presents information about liabilities measured at fair value on a recurring basis:

Changes in the fair value of our Level 3 contingent consideration liability for the three months ended March 31, 2018 were as follows:

Goodwill and intangible assets on our balance sheets are the result of our acquisitions of Sigma Systems Corp. ("Sigma") in October 2008, Thermonics, Inc. ("Thermonics") in January 2012 and Ambrell in May 2017. All of our goodwill and intangible assets are allocated to our Thermal segment. Goodwill totaled $13,738 at each of March 31, 2018 and December 31, 2017.

Intangible Assets

Changes in the amount of the carrying value of finite-lived intangible assets for the three months ended March 31, 2018 are as follows:

The following tables provide further detail about our intangible assets as of March 31, 2018 and December 31, 2017:

We generally amortize our finite-lived intangible assets over their estimated useful lives on a straight-line basis, unless an alternate amortization method can be reliably determined. Any such alternate amortization method would be based on the pattern in which the economic benefits of the intangible asset are expected to be consumed. None of our intangible assets have any residual value.

Total amortization expense for our finite-lived intangible assets was $216 and $53, respectively, for the three months ended March 31, 2018 and 2017. The following table sets forth the estimated annual amortization expense for each of the next five years:

Changes in the amount of the allowance for doubtful accounts for the three months ended March 31, 2018 are as follows:

The following tables provide additional information about our revenue from contracts with customers, including revenue by customer and product type and revenue by market. See also Note 12 for information about revenue by operating segment and geographic region.

During the three months ended March 31, 2018 and 2017, Texas Instruments Incorporated accounted for 11% and 13% of our consolidated net revenues, respectively. While both of our segments sold to this customer, these revenues were primarily generated by our EMS segment. During the three months ended March 31, 2017, Hakuto Co., Ltd., one of our distributors, accounted for 13% of our consolidated net revenues. These revenues were generated by our Thermal segment. No other customers accounted for 10% or more of our consolidated net revenues during the three months ended March 31, 2018 and 2017.

Inventories held at March 31, 2018 and December 31, 2017 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, 2018 and December 31, 2017 consisted of the following:

As of March 31, 2018, we have unvested restricted stock awards and stock options granted under stock-based compensation plans that are described more fully in Note 13 to the consolidated financial statements in our 2017 Form 10-K.

As of March 31, 2018, total unrecognized compensation expense related to unvested restricted stock awards and stock options was $1,511. The weighted average period over which this expense is expected to be recognized is 3.3 years. The following table shows the allocation of the compensation expense we recorded during the three months ended March 31, 2018 and 2017, respectively, related to stock-based compensation:

There was no stock-based compensation expense capitalized in the three months ended March 31, 2018 or 2017.

Restricted Stock Awards

We record compensation expense for restricted stock awards based on the quoted market price of our stock at the grant date and amortize the expense over the vesting period. Restricted stock awards generally vest over four years. However, in March 2018 and 2017, we granted 32,000 and 22,500 shares of restricted stock, respectively, to our independent directors. These shares vest 25% at each of March 31, June 30, September 30, and December 31 of the year in which they were granted. The total compensation expense related to these shares is $270 and $143, respectively, and is recorded as the shares vest.

The following table summarizes the activity related to unvested shares of restricted stock for the three months ended March 31, 2018:

The total fair value of the shares that vested during the three months ended March 31, 2018 and 2017 was $169 and $105, respectively, as of the vesting dates of these shares.

Stock Options

We record compensation expense for stock options based on the fair market value of the options as of the grant date. No option may be granted with an exercise period in excess of ten years from the date of grant. Generally, stock options will be granted with an exercise price equal to the fair market value of our stock on the date of grant and will vest over four years.

The fair value for stock options granted during the three months ended March 31, 2018 and 2017 was estimated at the date of grant using the Black-Scholes option pricing model with the following weighted average assumptions:

The per share weighted average fair value of stock options issued during the three months ended March 31, 2018 and 2017 was $3.61 and $2.64, respectively.

The following table summarizes the activity related to stock options for the three months ended March 31, 2018:

We have defined contribution 401(k) plans for our employees who work in the U.S. All permanent employees of inTEST Corporation, Temptronic Corporation (“Temptronic”) and inTEST Silicon Valley Corporation who are at least 18 years of age are eligible to participate in the inTEST Corporation Incentive Savings 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, 2018 and 2017, we recorded $121 and $163 of expense for matching contributions, respectively.

All permanent employees of Ambrell are immediately eligible to participate in the Ambrell Corporation Savings & Profit Sharing Plan (the "Ambrell Plan") upon employment and are eligible for employer matching contributions after completing one year of service, as defined in the Ambrell Plan. The Ambrell Plan allows eligible employees to make voluntary contributions up to 100% of compensation, up to the federal government contribution limits. We will make a matching contribution of 25% of each employee's contributions up to a maximum of 2% of such employee's annual compensation. For the three months ended March 31, 2018, we made matching contributions of $26.

We have two reportable segments, which are also our reporting units, Thermal and EMS.

Thermal includes the operations of Temptronic, Thermonics, Sigma, inTEST Thermal Solutions GmbH (Germany), inTEST Pte, Limited (Singapore) and Ambrell, which we acquired in May 2017, as discussed in Note 3. Sales of this segment consist primarily of temperature management systems which we design, manufacture and market under our Temptronic, Thermonics and Sigma product lines, and precision induction heating systems which are designed, manufactured and marketed by Ambrell. 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 sell our products both domestically and internationally. Both of our segments sell to semiconductor manufacturers, third-party test and assembly houses, ATE manufacturers and integrators. Thermal also sells into a variety of markets outside of the semiconductor market, including the automotive, consumer electronics, consumer product packaging, defense/aerospace, energy, fiber optics, industrial, telecommunications and other markets.

The following table provides information about our geographic areas of operation. Net revenues from unaffiliated customers are based on the location to which the goods are shipped.