ExOne (XONE) 10-K 22 Mar 16 2015 FY Annual report Financial data

Document and Entity Information

Document and Entity Information - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Mar. 22, 2016	Jun. 30, 2015
Document And Entity Information [Abstract]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec. 31, 2015
Document Fiscal Year Focus	2,015
Document Fiscal Period Focus	FY
Trading Symbol	XONE
Entity Registrant Name	ExOne Co
Entity Central Index Key	1,561,627
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	No
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Filer Category	Accelerated Filer
Entity Common Stock, Shares Outstanding		16,067,954
Entity Public Float			$ 116.3

Statement of Consolidated Opera

Statement of Consolidated Operations and Comprehensive Loss - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Revenue
Revenue - third party	$ 38,918	$ 43,029	$ 39,480
Revenue - related party (Note 18)	1,435	871	0
Revenue	40,353	43,900	39,480
Cost of sales	32,010	33,443	23,907
Gross profit	8,343	10,457	15,573
Operating expenses
Research and development	7,279	8,178	5,127
Selling, general and administrative	22,576	24,029	16,119
Goodwill impairment (Note 7)	4,419	0	0
Total operating expenses	34,274	32,207	21,246
Loss from operations	(25,931)	(21,750)	(5,673)
Other expense (income)
Interest expense	152	144	372
Other (income) expense - net	(45)	(210)	(98)
Total other (income) expense	107	(66)	274
Loss before income taxes	(26,038)	(21,684)	(5,947)
(Benefit) provision for income taxes (Note 15)	(173)	159	370
Net loss	(25,865)	(21,843)	(6,317)
Less: Net income attributable to noncontrolling interests	0	0	138
Net loss attributable to ExOne	$ (25,865)	$ (21,843)	$ (6,455)
Net loss attributable to ExOne per common share (Note 3):
Basic	$ (1.79)	$ (1.52)	$ (0.51)
Diluted	$ (1.79)	$ (1.52)	$ (0.51)
Comprehensive loss:
Net loss	$ (25,865)	$ (21,843)	$ (6,317)
Other comprehensive loss:
Foreign currency translation adjustments	(5,332)	(7,851)	(178)
Comprehensive loss	(31,197)	(29,694)	(6,495)
Less: Comprehensive income attributable to noncontrolling interests	0	0	138
Comprehensive loss attributable to ExOne	$ (31,197)	$ (29,694)	$ (6,633)

Consolidated Balance Sheet

Consolidated Balance Sheet - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents	$ 19,342	$ 36,202
Accounts receivable - net (Note 1)	9,368	14,238
Inventories - net (Note 5)	19,839	17,014
Prepaid expenses and other current assets	2,918	3,138
Total current assets	51,467	70,592
Property and equipment - net (Note 6)	54,832	55,298
Goodwill (Note 7)	0	4,665
Other noncurrent assets (Note 8)	1,659	2,572
Total assets	107,958	133,127
Current liabilities:
Current portion of long-term debt (Note 10)	138	132
Current portion of capital and financing leases (Note 11)	82	346
Accounts payable	3,231	2,553
Accrued expenses and other current liabilities (Note 12)	6,410	8,118
Deferred revenue and customer prepayments	7,103	902
Total current liabilities	16,964	12,051
Long-term debt - net of current portion (Note 10)	1,812	1,950
Capital and financing leases - net of current portion (Note 11)	81	164
Other noncurrent liabilities	28	417
Total liabilities	$ 18,885	$ 14,582
Contingencies and commitments (Note 13)
Stockholders' equity
Common stock, $0.01 par value, 200,000,000 shares authorized, 14,446,967 (2015) and 14,417,803 (2014) shares issued and outstanding	$ 144	$ 144
Additional paid-in capital	156,627	154,902
Accumulated deficit	(54,163)	(28,298)
Accumulated other comprehensive loss (Note 2)	(13,535)	(8,203)
Total stockholders' equity	89,073	118,545
Total liabilities and stockholders' equity	$ 107,958	$ 133,127

Consolidated Balance Sheet (Par

Consolidated Balance Sheet (Parenthetical) - $ / shares	Dec. 31, 2015	Dec. 31, 2014
Statement Of Financial Position [Abstract]
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	200,000,000	200,000,000
Common stock, shares issued	14,446,967	14,417,803
Common stock, shares outstanding	14,446,967	14,417,803

Statement of Consolidated Cash

Statement of Consolidated Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Operating activities
Net loss	$ (25,865)	$ (21,843)	$ (6,317)
Adjustments to reconcile net loss to cash used for operations:
Depreciation and amortization	5,227	4,520	2,372
Deferred income taxes	(268)	(131)	0
Equity-based compensation	1,725	1,206	711
Provision for bad debts	(254)	2,391	152
Changes in fair value of contingent consideration	(193)	(185)	0
Loss from sale of property and equipment	87	0	0
Goodwill impairment	4,419	0	0
Changes in assets and liabilities, excluding effects of acquisitions and foreign currency translation adjustments:
Decrease (increase) in accounts receivable	4,567	(7,162)	(823)
Increase in inventories	(8,021)	(9,098)	(8,083)
Decrease (increase) in prepaid expenses and other assets	703	(377)	(4,334)
Increase (decrease) in accounts payable	1,654	(97)	(1,100)
(Decrease) increase in accrued expenses and other liabilities	(823)	1,861	937
Increase (decrease) in deferred revenue and customer prepayments	6,320	(17)	(3,707)
Cash used for operating activities	(10,722)	(28,932)	(20,192)
Investing activities
Capital expenditures	(4,938)	(23,081)	(19,311)
Increase in restricted cash	(330)	0	0
Proceeds from sale of property and equipment	190	0	0
Acquisitions, net of cash acquired of $201	0	(9,155)	0
Cash effect of deconsolidation of noncontrolling interests in variable interest entities	0	0	(2,327)
Cash used for investing activities	(5,078)	(32,236)	(21,638)
Financing activities
Payments on long-term debt	(132)	(465)	(5,488)
Payments on capital and financing leases	(323)	(545)	(2,162)
Deferred financing costs	(215)	0	0
Proceeds from exercise of employee stock options	0	333	0
Net proceeds from issuance of common stock - initial public offering	0	0	91,083
Net proceeds from issuance of common stock - secondary public offering	0	0	64,948
Net change in line of credit borrowings	0	0	(528)
Net change in demand note payable to member	0	0	(9,885)
Payment of preferred stock dividends	0	0	(456)
Cash (used for) provided by financing activities	(670)	(677)	137,512
Effect of exchange rate changes on cash and cash equivalents	(390)	(398)	(39)
Net change in cash and cash equivalents	(16,860)	(62,243)	95,643
Cash and cash equivalents at beginning of period	36,202	98,445	2,802
Cash and cash equivalents at end of period	19,342	36,202	98,445
Supplemental disclosure of cash flow information
Cash paid for interest	122	144	310
Cash paid for income taxes	0	916	1,334
Supplemental disclosure of noncash investing and financing activities
Property and equipment included in accounts payable	0	819	0
Transfer of internally developed 3D printing machines from inventories to property and equipment for internal use	4,749	5,344	3,338
Transfer of internally developed 3D printing machines from property and equipment to inventories for sale	956	1,287	534
Property and equipment acquired through financing arrangements	0	89	282
Net assets acquired through acquisitions, net of cash acquired of $201	0	9,530	0
Noncash consideration for acquisitions	0	375	0
Conversion of preferred stock dividends payable and accrued interest to principal amounts due under demand note payable to member	0	0	1,219
Noncash effect of Reorganization of The Ex One Company, LLC with and into The ExOne Company	0	0	2,371
Noncash effect of deconsolidation of noncontrolling interests in variable interest entities	$ 0	$ 0	$ 397

Statement of Consolidated Cash6

Statement of Consolidated Cash Flows (Parenthetical) $ in Thousands	12 Months Ended
	Dec. 31, 2015USD ($)
Statement Of Cash Flows [Abstract]
Cash acquired from acquisitions	$ 201

Statement of Changes in Consoli

Statement of Changes in Consolidated Stockholders' / Members' Equity - USD ($) shares in Thousands, $ in Thousands	Total	Preferred Units [Member]	Common Units [Member]	Members' Deficit [Member]	Preferred Stock [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Deficit [Member]	Accumulated Other Comprehensive Loss [Member]	Noncontrolling Interests [Member]
Beginning Balance at Dec. 31, 2012	$ 41	$ 18,984	$ 10,000	$ (31,355)					$ (174)	$ 2,586
Beginning Balance, Shares at Dec. 31, 2012		18,984	10,000
Reorganization of The Ex One Company, LLC with and into The ExOne Company		$ (18,984)	$ (10,000)	$ 31,355	$ 190	$ 58	$ (2,619)
Reorganization of The Ex One Company, LLC with and into The ExOne Company, Shares		(18,984)	(10,000)		190	5,800
Preferred stock dividends	(152)						(152)
Conversion of preferred stock to common stock					$ (190)	$ 20	170
Conversion of preferred stock to common stock, Shares converted					(190)
Initial public offering of common stock in The ExOne Company, net of issuance costs	90,371					$ 55	90,316
Initial public offering of common stock in The ExOne Company, net of issuance costs, Shares						5,483
Secondary public offering of common stock in The ExOne Company, net of issuance costs	64,948					$ 11	64,937
Secondary public offering of common stock in The ExOne Company, net of issuance costs, Shares						1,106
Net loss	(6,317)							$ (6,455)		138
Other comprehensive loss	(178)								(178)
Equity-based compensation	711						711
Deconsolidation of noncontrolling interests in variable interest entities	(2,724)									$ (2,724)
Ending Balance at Dec. 31, 2013	146,700					$ 144	153,363	(6,455)	(352)
Ending Balance, Shares at Dec. 31, 2013						14,387
Conversion of preferred stock to common stock, Shares						1,998
Net loss	(21,843)							(21,843)
Other comprehensive loss	(7,851)								(7,851)
Equity-based compensation	1,206					$ 0	1,206
Common stock issued from equity incentive plan	333						333
Common stock issued from equity incentive plan, shares						30
Ending Balance at Dec. 31, 2014	118,545					$ 144	154,902	(28,298)	(8,203)
Ending Balance, Shares at Dec. 31, 2014						14,417
Net loss	(25,865)							(25,865)
Other comprehensive loss	(5,332)								(5,332)
Equity-based compensation	1,725					$ 0	1,725
Common stock issued from equity incentive plan, shares						30
Ending Balance at Dec. 31, 2015	$ 89,073					$ 144	$ 156,627	$ (54,163)	$ (13,535)
Ending Balance, Shares at Dec. 31, 2015						14,447

Summary of Significant Accounti

Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2015
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Note 1. Summary of Significant Accounting Policies Basis of Presentation and Principles of Consolidation The ExOne Company (“ExOne”) is a corporation organized under the laws of the state of Delaware. ExOne was formed on January 1, 2013, when The Ex One Company, LLC, a Delaware limited liability company, merged with and into a Delaware corporation, which survived and changed its name to The ExOne Company (the “Reorganization”). As a result of the Reorganization, The Ex One Company, LLC became ExOne, the common and preferred interest holders of The Ex One Company, LLC became holders of common stock and preferred stock, respectively, of ExOne, and the subsidiaries of The Ex One Company, LLC became the subsidiaries of ExOne. The consolidated financial statements include the accounts of ExOne, its wholly-owned subsidiaries, ExOne Americas LLC (United States), ExOne GmbH (Germany), ExOne KK (Japan); effective in August 2013, ExOne Property GmbH (Germany); effective in March 2014, MWT — Gesellschaft für Industrielle Mikrowellentechnik mbH (Germany); effective in May 2014, ExOne Italy S.r.l (Italy); effective in July 2015, ExOne Sweden AB (Sweden); and through March 27, 2013 (see further description below), two variable interest entities (“VIEs”) in which ExOne was identified as the primary beneficiary, Lone Star Metal Fabrication, LLC (“Lone Star”) and Troy Metal Fabricating, LLC (“TMF”). Collectively, the consolidated group is referred to as the “Company”. At December 31, 2012, and through March 27, 2013, ExOne leased property and equipment from Lone Star and TMF. ExOne did not have an ownership interest in Lone Star or TMF and the assets of Lone Star and TMF could only be used to settle obligations of Lone Star and TMF. ExOne was identified as the primary beneficiary of Lone Star and TMF in accordance with the guidance issued by the Financial Accounting Standards Board (“FASB”) on the consolidation of VIEs, as ExOne guaranteed certain long-term debt of both Lone Star and TMF and governed these entities through common ownership. This guidance requires certain VIEs to be consolidated when an enterprise has the power to direct the activities of the VIE that most significantly impact VIE economic performance and who has the obligation to absorb losses or the right to receive benefits of the VIE that could potentially be significant to the VIE. The consolidated financial statements therefore include the accounts of Lone Star and TMF through March 27, 2013. On March 27, 2013, ExOne Americas LLC acquired certain assets, including property and equipment (principally land, buildings and machinery and equipment) held by the two VIEs, and assumed all outstanding debt of such VIEs. Following this transaction, neither of the entities continued to meet the definition of a VIE with respect to ExOne, and as a result, the remaining assets and liabilities of both entities were deconsolidated following the transaction. On February 6, 2013, the Company commenced an initial public offering of 6,095,000 shares of its common stock at a price to the public of $18.00 per share, of which 5,483,333 shares were sold by the Company and 611,667 were sold by a selling stockholder (including consideration of the exercise of the underwriters’ over-allotment option). Following completion of the offering on February 12, 2013, the Company received net proceeds of approximately $91,996 (net of underwriting commissions). On September 9, 2013, the Company commenced a secondary public offering of 3,054,400 shares of its common stock at a price to the public of $62.00 per share, of which 1,106,000 shares were sold by the Company and 1,948,400 were sold by selling stockholders (including consideration of the exercise of the underwriters’ over-allotment option). Following completion of the offering on September 13, 2013, the Company received net proceeds of approximately $65,315 (net of underwriting commissions). The consolidated financial statements of the Company are prepared in conformity with accounting principles generally accepted in the United States of America (“GAAP”). All material intercompany transactions and balances have been eliminated in consolidation. Liquidity The Company has incurred a net loss in each of its annual periods since its inception. As shown in the accompanying statement of consolidated operations and comprehensive loss, the Company has incurred net losses of approximately $25,865, $21,843 and $6,317 for 2015, 2014 and 2013, respectively. As noted above, in connection with the completion of its initial public offering in February 2013 and secondary public offering in September 2013, the Company received total unrestricted net proceeds from the sale of its common stock of approximately $157,311. At December 31, 2015, the Company had approximately $19,342 in cash and cash equivalents. In addition, in January 2016, the Company entered into separate transactions for additional offerings of sale of its common stock resulting in additional unrestricted net proceeds to the Company (Note 20). Use of Estimates The preparation of these consolidated financial statements requires the Company to make certain judgments, estimates and assumptions regarding uncertainties that affect the reported amounts of assets, liabilities, revenue and expenses and related disclosure of contingent assets and liabilities. Areas that require significant judgments, estimates and assumptions include accounting for accounts receivable (including the allowance for doubtful accounts); inventories (including the allowance for slow-moving and obsolete inventory); product warranty reserves; income taxes (including the valuation allowance on certain deferred tax assets); equity-based compensation; and business combinations (including fair value estimates of contingent consideration) and testing for impairment of goodwill and long-lived assets. The Company bases its estimates on historical experience and on various other assumptions that are believed to be reasonable, the results of which forms the basis for making judgments about the carrying values of assets and liabilities that are not readily apparent from other sources. Actual results may differ from these estimates. Foreign Currency The local currency is the functional currency for significant operations outside of the United States. The determination of the functional currency of an operation is made based upon the appropriate economic and management indicators. Foreign currency assets and liabilities are translated into their United States dollar equivalents based upon year end exchange rates, and are included in stockholders’ equity as a component of other comprehensive loss. Revenues and expenses are translated at average exchange rates. Transaction gains and losses that arise from exchange rate fluctuations are charged to operations as incurred, except for gains and losses associated with certain long-term intercompany transactions for which settlement is not planned or anticipated in the foreseeable future, which are included in other comprehensive loss in the consolidated statement of operations and comprehensive loss. The Company transacts business globally and is subject to risks associated with fluctuating foreign exchange rates. Approximately 50.9%, 51.9% and 63.0% of the consolidated revenue of the Company was derived from transactions outside the United States for 2015, 2014 and 2013, respectively. This revenue is generated primarily from wholly-owned subsidiaries operating in their respective countries and surrounding geographic areas. This revenue is primarily denominated in each subsidiary’s local functional currency, including the Euro and Japanese Yen. Revenue Recognition The Company derives revenue from the sale of 3D printing machines and 3D printed and other products, materials and services. Revenue is recognized by the Company when (i) persuasive evidence of an arrangement exists, (ii) delivery has occurred or services have been rendered, (iii) selling price is fixed or determinable and (iv) collectability is reasonably assured. The Company enters into arrangements that may provide for multiple deliverables to a customer. Sales of 3D printing machines may also include optional equipment, materials, replacement components and services (installation, training and other services, including maintenance services and/or an extended warranty). The Company identifies all products and services that are to be delivered separately under an arrangement and allocates revenue to each based on their relative fair value. Fair values are generally established based on the prices charged when sold separately by the Company (vendor specific objective evidence). The allocated revenue for each deliverable is then recognized ratably based on relative fair values of the components of the sale. In the absence of vendor specific objective evidence or third party evidence in leading to a relative fair value for a sale component, the Company’s best estimate of selling price is used. The Company also evaluates the impact of undelivered items on the functionality of delivered items for each sales transaction and, where appropriate, defers revenue on delivered items when that functionality has been affected. Functionality is determined to be met if the delivered products or services represent a separate earnings process. Certain of the Company’s arrangements for 3D printing machines contain acceptance provisions for which the Company must determine whether it can objectively demonstrate that either company-specific or customer-specific criteria identified in such provisions have been met prior to recognizing revenue on the transaction. To the extent that the Company is able to effectively demonstrate that specific criteria are met, revenue is recognized at the time of delivery (generally when title and risk and rewards of ownership have transferred to the customer), otherwise revenue is deferred until formal acceptance is provided from the customer. The Company generally provides customers with a standard twelve month warranty on its 3D printing machines. The standard warranty is not treated as a separate service because the standard warranty is an integral part of the sale of the 3D printing machine. At the time of sale, a liability is recorded (with an offset to cost of sales in the statement of operations and comprehensive loss) based upon the expected cost of replacement parts and labor to be incurred over the life of the standard warranty. Following the standard warranty period, the Company offers its customers optional maintenance service contracts or extended warranties. Deferred maintenance service revenues are generally recognized when the maintenance services are performed since the Company has historical evidence that indicates that the costs of performing the services under the contract are not incurred on a straight-line basis. The Company sells equipment with embedded software to its customers. The embedded software is not sold separately and it is not a significant focus of the Company’s marketing effort. The Company does not provide post-contract customer support specific to the software or incur significant costs that are within the scope of FASB guidance on accounting for software to be leased or sold. Additionally, the functionality that the software provides is marketed as part of the overall product. The software embedded in the equipment is incidental to the equipment as a whole such that the FASB guidance referenced above is not applicable. Sales of these products are recognized in accordance with FASB guidance on accounting for multiple-element arrangements. Shipping and handling costs billed to customers are included in revenue in the consolidated statement of operations and comprehensive loss. Costs incurred by the Company associated with shipping and handling are included in cost of sales in the consolidated statement of operations and comprehensive loss. In assessing collectability as part of the revenue recognition process, the Company considers a number of factors in its evaluation of the creditworthiness of the customer, including past due amounts, past payment history, and current economic conditions. If it is determined that collectability cannot be reasonably assured, the Company will defer recognition of revenue until collectability is assured. For 3D printing machines, the Company’s terms of sale vary by transaction. To reduce credit risk in connection with 3D printing machine sales, the Company may, depending upon the circumstances, require certain amounts be prepaid. In some circumstances, the Company may require payment in full and may require international customers to furnish letters of credit. These prepayments are reported as deferred revenue and customer prepayments in the consolidated balance sheet. For 3D printed and other products and materials, the Company’s terms of sale generally require payment within 30 to 60 days after delivery, although the Company also recognizes that longer payment periods are customary in some countries where it transacts business. Service arrangements are generally billed in accordance with specific contract terms which typically correspond to performance of the related services. The Company has entered into certain contracts for the sale of its products and services with the federal government under fixed-fee, cost reimbursable and time and materials arrangements. With respect to cost reimbursable arrangements with the federal government, the Company generally bills for products and services in accordance with provisional rates as determined by the Company. To the extent that provisional rates billed under these contracts differ from actual experience, a billing adjustment (through revenue) is made in the period in which the difference is identified (generally upon completion of its annual Incurred Cost Submission filing as required by the federal government). For 2015, 2014 and 2013, revenues and any adjustments related to these contracts were not significant. Cash and Cash Equivalents The Company considers all highly liquid instruments with maturities when purchased of three months or less to be cash equivalents. The Company’s policy is to invest cash in excess of short-term operating and debt-service requirements in such cash equivalents. These instruments are stated at cost, which approximates fair value because of the short maturity of the instruments. The Company maintains cash balances with financial institutions located in the United States, Germany, Italy, Sweden and Japan. The Company places its cash with high quality financial institutions and believes its risk of loss is limited; however, at times, account balances may exceed international and federally insured limits. The Company has not experienced any losses associated with these cash balances. Restricted Cash The Company is required to maintain a cash collateral balance to offset certain short-term, unsecured lending commitments from a financial institution associated with the Company’s corporate credit card program. This balance is considered legally restricted by the Company. Restricted cash at December 31, 2015, was approximately $330 and is included in prepaid expenses and other current assets in the consolidated balance sheet. There was no such restriction on cash balances at December 31, 2014. Accounts Receivable Accounts receivable are reported at their net realizable value. The Company’s estimate of the allowance for doubtful accounts related to trade receivables is based on the Company’s evaluation of customer accounts with past-due outstanding balances or specific accounts for which it has information that the customer may be unable to meet its financial obligations. Based upon review of these accounts, and management’s analysis and judgment, the Company records a specific allowance for that customer’s accounts receivable balance to reduce the outstanding receivable balance to the amount expected to be collected. The allowance is re-evaluated and adjusted periodically as additional information is received that impacts the allowance amount reserved. At December 31, 2015 and 2014, the allowance for doubtful accounts was approximately $1,920 and $2,431, respectively. During 2015 the Company recorded a net credit of approximately ($254) associated with its provision for bad debts, as reversals of previously recorded allowances (based on collections of the related accounts receivable) exceeded provisions recorded. During 2014 and 2013 the Company recorded provisions for bad debts of approximately $2,391 and $152, respectively, associated with customer balances for which collectability became uncertain as a result of deteriorating credit quality based on either customer-specific or macroeconomic factors. Inventories The Company values all of its inventories at the lower of cost, as determined on the first-in, first-out method or market value. Overhead is allocated to work in process and finished goods based upon normal capacity of the Company’s production facilities. Fixed overhead associated with production facilities that are being operated below normal capacity are recognized as a period expense rather than being capitalized as a product cost. An allowance for slow-moving and obsolete inventories is provided based on historical experience and anticipated product demand. These provisions reduce the cost basis of the respective inventories and are recorded as a charge to cost of sales. Property and Equipment Property and equipment are recorded at cost and depreciated on a straight-line basis over the estimated useful lives of the related assets, generally three to forty years. Leasehold improvements are amortized on a straight-line basis over the shorter of (i) their estimated useful lives or (ii) the estimated or contractual lives of the related leases. Gains or losses from the sale of assets are recognized upon disposal or retirement of the related assets and are generally recorded in cost of sales in the statement of consolidated operations and comprehensive loss. Repairs and maintenance are charged to expense as incurred. The Company evaluates long-lived assets for impairment whenever events or changes in circumstances indicate that the carrying amount of such assets (asset group) may not be recoverable. Recoverability of assets is determined by comparing the estimated undiscounted net cash flows of the operations related to the assets (asset group) to their carrying amount. An impairment loss would be recognized when the carrying amount of the assets (asset group) exceeds the estimated undiscounted net cash flows. The amount of the impairment loss to be recorded is calculated as the excess of carrying value of assets (asset group) over their fair value. The determination of what constitutes an asset group, the associated undiscounted net cash flows, the fair value of assets (asset group) and the estimated useful lives of assets require significant judgments and estimates by management. No impairment loss was recorded by the Company during 2015, 2014 or 2013 (Note 7). Goodwill Goodwill represents the excess of purchase price over the fair value of identifiable net assets of acquired entities. Goodwill is not amortized; instead, it is reviewed for impairment annually or more frequently if indicators of impairment exist (a triggering event) or if a decision is made to sell or exit a business. A significant amount of judgment is involved in determining if an indicator of impairment has occurred. Such indicators may include deterioration in general economic conditions, negative developments in equity and credit markets, including a significant decline in an entity’s market capitalization, adverse changes in the markets in which an entity operates, increases in input costs that have a negative effect on earnings and cash flows, or a trend of negative or declining cash flows, among others. Goodwill is allocated among and evaluated for impairment at the reporting unit level, which is defined as an operating segment or one level below an operating segment (an operating segment component). Based on an evaluation of its operational management and reporting structure, the Company has determined that it operates as a single operating segment, operating segment component, and reporting unit. In reviewing goodwill for impairment, an entity has the option to first assess qualitative factors to determine whether the existence of events or circumstances leads to a determination that it is more likely than not (greater than 50%) that the estimated fair value of a reporting unit is less than its carrying amount. If an entity elects to perform a qualitative assessment and determines that an impairment is more likely than not, the entity is then required to perform a two-step quantitative impairment test (described below), otherwise no further analysis is required however, it will continue to be evaluated at least annually as described above. An entity also may elect not to perform the qualitative assessment and, instead, proceed directly to the two-step quantitative impairment test. The ultimate outcome of the goodwill impairment review for a reporting unit should be the same whether an entity chooses to perform the qualitative assessment or proceeds directly to the two-step quantitative impairment test. Under the qualitative assessment, various events and circumstances (or factors) that would affect the estimated fair value of a reporting unit are identified (similar to impairment indicators above). These factors are then classified by the type of impact they would have on the estimated fair value using positive, neutral, and adverse categories based on current business conditions. Additionally, an assessment of the level of impact that a particular factor would have on the estimated fair value is determined using high, medium, and low weighting. Under the two-step quantitative impairment test, the evaluation of impairment involves comparing the current fair value of a reporting unit to its carrying value, including goodwill (step 1). The Company determines fair value through a combination of the market approach and income approach. The market approach includes consideration of the Company’s market capitalization (as a single reporting unit entity) along with consideration of other factors that could influence the use of market capitalization as a fair value estimate, including premiums or discounts to be applied based on both market and entity-specific data. The income approach includes consideration of present value techniques, principally the use of a discounted cash flow model. The development of fair value under both approaches requires the use of significant assumptions and estimates by management. In the event the estimated fair value of a reporting unit is less than the carrying value (step 1), additional analysis would be required (step 2). The additional analysis (step 2) would compare the carrying amount of the reporting unit’s goodwill with the implied fair value of that goodwill, which may involve the use of valuation experts. The implied fair value of goodwill is the excess of the fair value of the reporting unit over the fair value amounts assigned to all of the assets and liabilities of that unit as if the reporting unit was acquired in a business combination and the fair value of the reporting unit represented the purchase price. If the carrying value of goodwill exceeds its implied fair value, an impairment loss equal to such excess would be recognized, which could significantly and adversely impact reported results of operations. During the quarter ended September 30, 2015, as a result of the significant decline in market capitalization of the Company and continued operating losses and cash flow deficiencies, the Company identified a triggering event requiring an interim test for impairment of goodwill at the reporting unit level. In performing the impairment test for goodwill, the Company determined the carrying amount of goodwill to be in excess of the implied fair value of goodwill. As a result, the Company recognized an impairment loss of approximately $4,419 (Note 7). Contingent Consideration The Company records contingent consideration resulting from a business combination at its fair value on the date of acquisition. Each reporting period thereafter, the Company revalues these obligations and records increases or decreases in their fair value as a charge (credit) to selling, general and administrative costs within the statement of consolidated operations and comprehensive loss. Changes in the fair value of contingent consideration obligations can result from adjustments to (i) forecast revenues, profitability or a combination thereto or (ii) discount rates. These fair value measurements represent Level 3 measurements, as they are based on significant unobservable inputs. Product Warranty Reserves Substantially all of the Company’s 3D printing machines are covered by a standard twelve month warranty. At the time of sale, a liability is recorded (with an offset to cost of sales in the statement of operations and comprehensive loss) based upon the expected cost of replacement parts and labor to be incurred over the life of the standard warranty. Expected cost is estimated using historical experience for similar products. The Company periodically assesses the adequacy of the product warranty reserves based on changes in these factors and records any necessary adjustments if actual experience indicates that adjustments are necessary. Future claims experience could be materially different from prior results because of the introduction of new, more complex products, a change in the Company’s warranty policy in response to industry trends, competition or other external forces, or manufacturing changes that could impact product quality. In the event that the Company determines that its current or future product repair and replacement costs exceed estimates, an adjustment to these reserves would be charged to cost of sales in the statement of consolidated operations and comprehensive loss in the period such a determination is made. At December 31, 2015 and 2014, product warranty reserves were approximately $1,308 and $1,543, respectively, and were included in accrued expenses and other current liabilities in the consolidated balance sheet. Income Taxes The (benefit) provision for income taxes is determined using the asset and liability approach of accounting for income taxes. Under this approach, the (benefit) provision for income taxes represents income taxes paid or payable (or received or receivable) for the current year plus the change in deferred taxes during the year. Deferred taxes represent the future tax consequences expected to occur when the reported amounts of assets and liabilities are recovered or paid, and result from differences between the financial and tax bases of assets and liabilities and are adjusted for changes in tax rates and tax laws when enacted. Valuation allowances are established when necessary to reduce deferred tax assets to the amount expected to be realized. The Company’s subsidiaries in Germany, Italy, Sweden and Japan are taxed as corporations under the taxing regulations of those respective countries. As a result, the consolidated statement of operations and comprehensive loss includes a (benefit) provision for income taxes related to these foreign jurisdictions. Any undistributed earnings are intended to be permanently reinvested in the respective subsidiaries. The Company recognizes the tax benefit from an uncertain tax position only if it is more likely than not that the tax position will be sustained on examination by the taxing authorities based upon the technical merits of the position. The tax benefits recognized in the consolidated financial statements from such positions are then measured based upon the largest amount that has a greater than 50% likelihood of being realized upon settlement. Tax benefits that do not meet the more likely than not criteria are recognized when effectively settled, which generally means that the statute of limitations has expired or that appropriate taxing authority has completed its examination even through the statute of limitations remains open. Interest and penalties related to uncertain tax positions are recognized as part of the (benefit) provision for income taxes in the consolidated statement of operations and comprehensive loss and are accrued beginning in the period that such interest and penalties would be applicable under relevant tax law until such time that the related tax benefits are recognized. Taxes on Revenue Producing Transactions Taxes assessed by governmental authorities on revenue producing transactions, including sales, excise, value added and use taxes, are recorded on a net basis (excluded from revenue) in the consolidated statement of operations and comprehensive loss. Research and Development The Company is involved in research and development of new methods and technologies relating to its products. Research and development expenses are charged to operations as they are incurred. The Company capitalizes the cost of materials, equipment and facilities that have alternative future uses in research and development projects or otherwise. Advertising Advertising costs are charged to expense as incurred, and were not significant for 2015, 2014 or 2013. Defined Contribution Plan The Company sponsors a defined contribution savings plan under section 401(k) of the Internal Revenue Code. Under the plan, participating employees in the United States may elect to defer a portion of their pre-tax earnings, up to the Internal Revenue Service’s annual contribution limit. The Company makes discretionary matching contributions of 50% of the first 8% of employee contributions, subject to certain Internal Revenue Service limitations. The Company’s matching contributions to the plan were approximately $365, $269 and $92 in 2015, 2014 and 2013, respectively. Equity-Based Compensation The Company recognizes compensation expense for equity-based grants using the straight-line attribution method, in which the expense (net of estimated forfeitures) is recognized ratably over the requisite service period based on the grant date fair value. Fair value of equity-based awards is estimated on the date of grant using the Black-Scholes pricing model. Recently Adopted Accounting Guidance On January 1, 2014, the Company adopted FASB guidance changing the requirements of the Company’s reporting of amounts reclassified out of accumulated other comprehensive income (loss). These changes require an entity to report the effect of significant reclassifications out of accumulated other comprehensive income (loss) on the respective line items in net income (loss) if the amount being reclassified is required to be reclassified in its entirety to net income (loss). For other amounts that are not required to be reclassified in their entirety to net income (loss) in the same reporting period, an entity is required to cross-reference other disclosures that provide additional detail about those amounts. These requirements are to be applied to each component of accumulated other comprehensive income (loss). Other than additional disclosure requirements, the adoption of these changes did not have a significant impact on the consolidated financial statements of the Company. On January 1, 2015, the Company adopted FASB guidance clarifying the presentation of unrecognized tax benefits when a net operating loss carryforward, or similar tax loss or a tax credit carryforward exists. The amendment requires that unrecognized tax benefits be presented in the consolidated financial statements as a reduction to a deferred tax asset for a net operating loss carryforward, a similar tax loss, or a tax credit carryforward, unless certain exceptions exist. Previously, there was diversity in practice as no explicit guidance existed. As the Company had previously followed the now required presentation, the adoption of this guidance did not have a material impact on the consolidated financial statements of the Company. In November 2015, the FASB issued changes to the balance sheet classification of deferred taxes, which the Company elected to early adopt. These changes simplify the presentation of deferred income taxes by requiring all deferred income tax assets and liabilities to be classified as noncurrent in a classified balance sheet. The current requirement that deferred tax assets and liabilities of a tax-paying component of an entity be offset and prese

Accumulated Other Comprehensive

Accumulated Other Comprehensive Loss	12 Months Ended
	Dec. 31, 2015
Equity [Abstract]
Accumulated Other Comprehensive Loss	Note 2. Accumulated Other Comprehensive Loss The following table summarizes changes in the components of accumulated other comprehensive loss: For the years ended December 31, 2015 2014 2013 Foreign currency translation adjustments Balance at beginning of period $ (8,203 ) $ (352 ) $ (174 ) Other comprehensive loss (5,332 ) (7,851 ) (178 ) Balance at end of period $ (13,535 ) $ (8,203 ) $ (352 ) Foreign currency translation adjustments consist of (i) the effect of translation of functional currency financial statements (denominated in the Euro and Japanese Yen) to the reporting currency of the Company (United States dollar) and (ii) certain long-term intercompany transactions for which settlement is not planned or anticipated in the foreseeable future. There were no tax impacts related to income tax rate changes and no amounts were reclassified to earnings for any of the periods presented.

Loss Per Share

Loss Per Share	12 Months Ended
	Dec. 31, 2015
Earnings Per Share [Abstract]
Loss Per Share	Note 3. Loss Per Share The Company presents basic and diluted loss per common share amounts. Basic loss per share is calculated by dividing net loss available to ExOne common shareholders by the weighted average number of common shares outstanding during the applicable period. Diluted loss per share is calculated by dividing net loss available to ExOne common shareholders by the weighted average number of common shares and common equivalent shares outstanding during the applicable period. As ExOne incurred a net loss during 2015, 2014 and 2013, basic average shares outstanding and diluted average shares outstanding were the same because the effect of potential shares of common stock, including incentive stock options (210,970 — 2015, 215,137 — 2014 and 173,333 — 2013) and unvested restricted stock issued (77,670— 2015, 80,834 — 2014 and 20,000 — 2013), was anti-dilutive. The information used to compute basic and diluted net loss attributable to ExOne per common share was as follows: For the years ended December 31, 2015 2014 2013 Net loss attributable to ExOne $ (25,865 ) $ (21,843 ) $ (6,455 ) Less: Preferred stock dividends declared — — (152 ) Net loss available to ExOne common shareholders $ (25,865 ) $ (21,843 ) $ (6,607 ) Weighted average shares outstanding (basic and diluted) 14,427,956 14,411,054 12,838,230 Net loss attributable to ExOne per common share: Basic $ (1.79 ) $ (1.52 ) $ (0.51 ) Diluted $ (1.79 ) $ (1.52 ) $ (0.51 )

Acquisitions

Acquisitions	12 Months Ended
	Dec. 31, 2015
Business Combinations [Abstract]
Acquisitions	Note 4. Acquisitions MAM On March 3, 2014, the Company, through its wholly-owned subsidiary ExOne Americas LLC, entered into an Asset Purchase Agreement to acquire (i) substantially all the assets of Machin-A-Mation Corporation (“MAM”), a specialty machine shop located in Chesterfield, Michigan, and (ii) the real property on which the MAM business is located from Metal Links, LLC, a Michigan limited liability company. The total purchase price was approximately $4,917, which includes approximately $4,542 in cash and $375 in contingent consideration in the form of a two-year earn-out provision. The two-year earn-out provision is based on a combination of achievement of revenues and gross profit for the acquired business for which the Company assumed full achievement of both targets for each of the respective years from the date of acquisition. The following table summarizes the final allocation of purchase price: Accounts receivable $ 209 Inventories 224 Prepaid expenses and other current assets 15 Property and equipment 2,998 Intangible assets 503 Goodwill 1,407 Total assets 5,356 Accounts payable 56 Accrued expenses and other current liabilities 45 Long-term debt 338 Total liabilities 439 Total purchase price $ 4,917 The allocation of the purchase price to the net assets acquired and liabilities assumed resulted in the recognition of the following intangible assets: Amount Economic Life (in years) Customer relationships $ 464 7 Trade name 24 5 Noncompetition agreement 15 3 $ 503 Of the $1,407 of goodwill generated as a result of the MAM acquisition, approximately $1,083 will be deductible for income tax purposes. Goodwill associated with the MAM acquisition relates principally to the complementary nature of the assets acquired in relation to the existing business held by the Company in Troy, Michigan, the combination of which is expected to further enhance the post-printing capabilities of ExOne. As the Company operates as a single operating segment (also a single reporting unit), there is no further assignment of goodwill to a reportable segment. Immediately following the completion of the MAM acquisition, the Company elected to repay all of the long-term debt assumed as part of the transaction. Prepayment penalties associated with this repayment were not significant and no gain or loss was recorded by the Company. The Company incurred total acquisition-related expenses of approximately $88 in connection with the MAM acquisition, of which $76 was recognized by the Company during 2014 (the remainder recognized during 2013). Acquisition-related expenses are expensed as incurred in accordance with FASB guidance associated with business combination activities, with amounts included in selling, general and administrative expenses in the statement of consolidated operations and comprehensive loss. The results of operations and pro forma effects of the MAM acquisition are not significant relative to the Company and as such, have been omitted. MWT On March 6, 2014, the Company, through its wholly-owned subsidiary ExOne GmbH, entered into a Purchase and Assignment Contract to acquire all of the shares of MWT—Gesellschaft für Industrielle Mikrowellentechnik mbH (“MWT”), a pioneer in industrial-grade microwaves with design and manufacturing experience based in Elz, Germany. The total purchase price was approximately €3,500 ($4,814) which was settled in cash on the date of acquisition. The following table summarizes the final allocation of purchase price: Cash and cash equivalents $ 201 Accounts receivable* 118 Inventories 476 Prepaid expenses and other current assets 29 Property and equipment 21 Intangible assets 1,704 Goodwill 3,685 Total assets 6,234 Accounts payable 128 Accrued expenses and other current liabilities 605 Deferred revenue and customer prepayments* 195 Deferred income taxes 492 Total liabilities 1,420 Total purchase price $ 4,814 * Included in accounts receivable and deferred revenue and customer prepayments were amounts due to MWT and the Company at the date of acquisition of approximately $117 and $195, respectively. These amounts were settled between the parties immediately following completion of the acquisition, resulting in no impact to the consolidated financial statements of the Company. The allocation of the purchase price to the net assets acquired and liabilities assumed resulted in the recognition of the following intangible assets: Amount Economic Life (in years) Unpatented technology $ 1,668 4 Trade name 36 4 $ 1,704 None of the goodwill associated with the MWT acquisition is deductible for income tax purposes. Goodwill associated with the MWT acquisition relates principally to the complementary nature of the industrial microwave technologies acquired in relation to the existing business held by the Company in Gersthofen, Germany, the combination of which is expected to further enhance the post-printing capabilities of ExOne. As the Company operates as a single operating segment (also a single reporting unit), there is no further assignment of goodwill to a reportable segment. The Company incurred total acquisition-related expenses of approximately $143 in connection with the MWT acquisition, of which $138 was recognized by the Company during 2014 (the remainder recognized during 2013). Acquisition-related expenses are expensed as incurred in accordance with FASB guidance associated with business combination activities, with amounts included in selling, general and administrative expenses in the statement of consolidated operations and comprehensive loss. The results of operations and pro forma effects of the MWT acquisition are not significant relative to the Company and as such, have been omitted. Acquisition of Net Assets of VIEs On March 27, 2013, ExOne Americas LLC acquired certain assets, including property and equipment (principally land, buildings and machinery and equipment) held by two VIEs of the Company, TMF and Lone Star, and assumed all outstanding debt of such VIEs. Payments of approximately $1,900 and $200 were made to TMF and Lone Star, respectively, including a return of capital to the entities of approximately $1,400. As the parties subject to this transaction were determined to be under common control, property and equipment acquired in the transaction were recorded at their net carrying value on the date of acquisition (approximately $5,400) similar to a pooling-of-interests. As the VIEs were consolidated by the Company in previous periods, no material differences exist due to the change in reporting entity, and as such, no restatement of prior period financial statements on a combined basis is considered necessary. There was no gain or loss or goodwill generated as a result of this transaction, as the total purchase price was equal to the net book value of assets at the VIE level (previously consolidated by the Company). Simultaneous with the completion of this transaction, the Company also repaid all of the outstanding debt assumed from the VIEs, resulting in a payment of approximately $4,700. Subsequent to this transaction, neither TMF or Lone Star continued to meet the definition of a VIE with respect to ExOne, and as a result, the remaining assets and liabilities of both entities were deconsolidated following the transaction, resulting in a reduction to equity (through noncontrolling interest) of approximately $2,724.

Inventories

Inventories	12 Months Ended
	Dec. 31, 2015
Inventory Disclosure [Abstract]
Inventories	Note 5. Inventories Inventories consist of the following at December 31: 2015 2014 Raw materials and components $ 9,467 $ 10,838 Work in process 6,048 4,221 Finished goods 4,324 1,955 $ 19,839 $ 17,014 Raw materials and components consist of (i) consumable materials and (ii) component parts and subassemblies associated with 3D printing machine manufacturing and support activities. Work in process consists of 3D printing machines and other products in varying stages of completion. Finished goods consist of 3D printing machines and other products prepared for delivery in accordance with customer specifications. At December 31, 2015 and 2014, the allowance for slow-moving and obsolete inventories was approximately $1,909 and $1,241, respectively, and has been reflected as a reduction to inventories (principally raw materials and components). Included in the allowance for slow-moving and obsolete inventories at December 31, 2015 and 2014, is approximately $507 and $419 associated with the Company’s laser micromachining product line which was discontinued at the end of 2014.

Property and Equipment

Property and Equipment	12 Months Ended
	Dec. 31, 2015
Property Plant And Equipment [Abstract]
Property and Equipment	Note 6. Property and Equipment Property and equipment consist of the following at December 31: 2015 2014 Economic Life (in years) Land $ 6,969 $ 7,154 N/A Buildings and related improvements 28,498 27,031 5 - 40 Machinery and equipment 23,935 18,510 3 - 20 Other 5,995 4,935 3 - 20 65,397 57,630 Less: Accumulated depreciation (11,017 ) (7,213 ) 54,380 50,417 Construction-in-progress 452 4,881 Property and equipment - net $ 54,832 $ 55,298 Machinery and equipment includes assets leased by the Company of approximately $364 and $1,057 at December 31, 2015 and 2014, respectively. Machinery and equipment includes assets leased to customers (principally 3D printing machines and related equipment) under operating lease arrangements of approximately $2,267 and $1,371 at December 31, 2015 and 2014, respectively. The carrying value of these assets was approximately $1,816 and $844 at December 31, 2015 and 2014, respectively. Minimum future rentals of machinery and equipment under non-cancellable arrangements at December 31, 2015, are as follows: 2016 $ 859 2017 439 2018 118 2019 — 2020 — Thereafter — $ 1,416 Depreciation expense was approximately $4,809, $4,139 and $2,372 for 2015, 2014 and 2013, respectively.

Impairment

Impairment	12 Months Ended
	Dec. 31, 2015
Asset Impairment Charges [Abstract]
Impairment	Note 7. Impairment During the quarter ended September 30, 2015, as a result of the significant decline in the market capitalization of the Company and continued operating losses and cash flow deficiencies, the Company identified a triggering event requiring both (i) a test for the recoverability of long-lived assets held for use at the asset group level and (ii) a test for impairment of goodwill at the reporting unit level. Assessing the recoverability of long-lived assets held for use and goodwill requires significant judgments and estimates by management. For purposes of testing long-lived assets for recoverability, the Company operates as three separate asset groups: United States, Europe and Japan. In assessing the recoverability of long-lived assets held for use, the Company determined the carrying amount of long-lived assets held for use to be in excess of the estimated future undiscounted net cash flows of the related assets. The Company proceeded to determination of the fair value of its long-lived assets held for use, principally through use of the market approach. The Company’s use of the market approach included consideration of market transactions for comparable assets. Management concluded that the fair value of long-lived assets held for use exceeded their carrying value and as such no impairment loss was recorded . The Company subsequently performed an impairment test for goodwill. For purposes of testing goodwill for impairment, the Company operates as a singular reporting unit. In assessing goodwill for impairment, the Company compared the fair value of its reporting unit to its carrying value. The Company determined the fair value of its reporting unit through a combination of the market approach and income approach. The Company’s use of the market approach included consideration of the Company’s market capitalization along with consideration of other factors that could influence the use of market capitalization as a fair value estimate, including premiums or discounts to be applied based on both market and entity-specific data. The Company’s use of the income approach included consideration of present value techniques, principally the use of a discounted cash flow model. In performing the impairment test for goodwill, the Company determined the carrying amount of goodwill to be in excess of the implied fair value of goodwill . As a result, the Company recognized an impairment loss of approximately $4,419 associated with goodwill during the quarter ended September 30, 2015. The following table details the changes in the carrying amount of goodwill for the year ended December 31: 2015 2014 Beginning balance $ 4,665 $ — Acquisition of businesses — 5,092 Foreign currency translation adjustments (246 ) (427 ) Impairment (4,419 ) — Ending balance $ — $ 4,665 During the quarter ended December 31, 2015, as a result of continued operating losses and cash flow deficiencies, the Company identified a triggering event requiring a test for the recoverability of long-lived assets held for use at the asset group level. The Company conducted a similar recoverability test to the test further described above at the asset group level. Management concluded that the fair value of long-lived assets held for use exceeded their carrying value and as such no impairment loss was recorded. A significant decrease in the market price of a long-lived asset, adverse change in the use or condition of a long-lived asset, adverse change in the business climate or legal or regulatory factors impacting a long-lived asset and continued operating losses and cash flow deficiencies associated with a long-lived asset, among other indicators, could cause a future assessment to be performed which may result in an impairment of long-lived assets held for use, resulting in a material adverse effect on the financial position and results of operations of the Company.

Intangible Assets

Intangible Assets	12 Months Ended
	Dec. 31, 2015
Goodwill And Intangible Assets Disclosure [Abstract]
Intangible Assets	Note 8. Intangible Assets Intangible assets, which are included in other noncurrent assets on the accompanying consolidated balance sheet, were as follows: December 31, 2015 Gross Amount Accumulated Amortization Net Unpatented technology $ 1,323 $ (606 ) $ 717 Customer relationships 464 (122 ) 342 Trade names 53 (22 ) 31 Noncompetition agreement 15 (9 ) 6 $ 1,855 $ (759 ) $ 1,096 December 31, 2014 Gross Amount Accumulated Amortization Net Unpatented technology $ 1,474 $ (307 ) $ 1,167 Customer relationships 464 (55 ) 409 Trade names 56 (11 ) 45 Noncompetition agreement 15 (4 ) 11 $ 2,009 $ (377 ) $ 1,632 Amortization expense related to the intangible assets was approximately $418 and $381 for 2015 and 2014, respectively. There were no intangible assets recorded by the Company at December 31, 2013. Future estimated amortization expense related to the intangible assets at December 31, 2015, is approximately as follows: 2016 $ 415 2017 410 2018 127 2019 67 2020 66 Thereafter 11 $ 1,096

Related Party Revolving Credit

Related Party Revolving Credit Facility	12 Months Ended
	Dec. 31, 2015
Line Of Credit Facility [Abstract]
Related Party Revolving Credit Facility	Note 9. Related Party Revolving Credit Facility On October 23, 2015, ExOne and its ExOne Americas LLC and ExOne GmbH subsidiaries, as guarantors, entered into a Credit Agreement (the “Credit Agreement”) with RHI Investments, LLC (“RHI”), a related party, on a $15,000 revolving credit facility to (i) assist the Company in its efforts to finance customer acquisition of its 3D printing machines and 3D printed and other products and services and (ii) provide additional funding for working capital and general corporate purposes. RHI was determined to be a related party based on common control by the Chairman and CEO of the Company. Prior to execution, the Credit Agreement was subject to review and approval by the Audit Committee of the Board of Directors and the independent members of the Board of Directors of the Company. The Company incurred approximately $215 in deferred financing costs associated with the Credit Agreement. On January 10, 2016, the Company delivered notice to RHI of its intent to terminate the Credit Agreement in connection with the closing of a registered direct offering of common equity to an entity under common control by the Chairman and CEO of the Company (Note 20). There were no borrowings under the Credit Agreement from January 1, 2016 through the effective date of its termination, January 13, 2016. In connection with the termination, the Company paid in-full its remaining accrued interest under the Credit Agreement of approximately $5 relating to the commitment fee on the unused portion of the revolving credit facility. In addition, during the quarter ending March 31, 2016, the Company will record approximately $204 to interest expense related to the accelerated amortization of previously deferred financing costs. Upon termination of the Credit Agreement, all liens and guaranties in respect thereof were released.

Long-Term Debt

Long-Term Debt	12 Months Ended
	Dec. 31, 2015
Debt Disclosure [Abstract]
Long-Term Debt	Note 10. Long-Term Debt Long-term debt consists of the following at December 31: 2015 2014 Building note payable to a United States bank $ 1,950 $ 2,082 Terms of the building note payable to a United States bank include monthly payments of approximately $18 including interest at 4.00% through May 2017, and subsequently, the monthly average yield on United States Treasury Securities plus 3.25% for the remainder of the term through May 2027. At December 31, 2015, the Company identified that it was not in compliance with the annual cash flow-to-debt service ratio covenant associated with the building note payable to a United States bank. The Company requested and was granted a waiver related to compliance with this annual covenant at December 31, 2015 and through December 31, 2016. Related to the 2015 noncompliance, there were no cross default provisions or related impacts on other lending agreements. Future maturities of long-term debt at December 31, 2015, are approximately as follows: 2016 $ 138 2017 139 2018 142 2019 150 2020 158 Thereafter 1,223 $ 1,950 At December 31, 2014, ExOne GmbH had separate line of credit and security agreements with a German bank for approximately $600 (€500) and $1,000 (€800), respectively. Both agreements had an indefinite term and were subject to cancellation by either party at any time upon repayment of amounts outstanding or expiration of certain transactions requiring security. There was no commitment fee associated with either agreement. The line of credit agreement contained a negative covenant of an annual equity capital ratio for ExOne GmbH of no less than 50%. At December 31, 2014, there were no outstanding borrowings under the line of credit agreement. At December 31, 2014, ExOne GmbH had outstanding guarantees or letters of credit of approximately $1,442 (€1,186) against certain commercial transactions requiring security under the security agreement. Outstanding guarantees or letters of credit in excess of the security agreement limitation were separately approved by the German bank. At December 31, 2014, ExOne GmbH identified that it was not in compliance with the annual equity capital ratio covenant associated with the line of credit agreement. ExOne GmbH did not obtain a waiver related to compliance with this annual covenant and believed its future borrowing abilities to be restricted on the basis of an event of default under the line of credit agreement. Based on the cancellable nature of the line of credit agreement, any requests for borrowings were effectively subject to approval by the German bank. Related to the 2014 noncompliance, there were no cross default provisions or related impacts on other lending agreements . In September 2015, ExOne GmbH and the German bank agreed to a cancellation of both the line of credit agreement and security agreement concurrent with an agreement to a separate credit facility agreement. The credit facility agreement provides for various short-term financings in the form of overdraft credit, guarantees, letters of credit and collateral security for various commercial transactions for approximately $1,400 (€1,300). In addition, ExOne GmbH may use the credit facility agreement for short-term, fixed-rate loans in minimum increments of approximately $110 (€100) with minimum terms of at least thirty days. The overdraft credit interest rate is fixed at 10.2% while the interest rate associated with transactions requiring security (guarantees, letters of credit or collateral agreements) is fixed at 1.75%. The credit facility agreement has an indefinite term and is subject to cancellation by either party at any time upon repayment of amounts outstanding or expiration of certain transactions requiring security. There is no commitment fee associated with the credit facility agreement. There are no negative covenants associated with the credit facility agreement. The credit facility agreement has been guaranteed by the Company. At December 31, 2015, there were no outstanding borrowings under the credit facility agreement. At December 31, 2015, ExOne GmbH had outstanding guarantees or letters of credit of approximately $685 (€628) against certain commercial transactions requiring security.

Leases

Leases	12 Months Ended
	Dec. 31, 2015
Debt Disclosure [Abstract]
Leases	Note 11. Leases Capital and Financing In March 2012, the Company entered into a sale-leaseback transaction with a bank for a 3D printing machine. Due to continuing involvement outside of the normal leaseback by the Company, this transaction has been accounted for as a financing lease. Under the terms of the agreement, the Company received proceeds of approximately $985 (€739) with repayment of the lease occurring over a three-year period beginning in April 2012. In March 2015, this transaction expired resulting in a repurchase of the 3D printing machine by the Company. The Company recognized a net gain of approximately $20 (€18) on the repurchase of the 3D printing machine based on the difference between the purchase price and deferred income on the financing. In November 2012, the Company entered into a sale-leaseback transaction with a bank for a 3D printing machine. Due to continuing involvement outside of the normal leaseback by the Company, this transaction has been accounted for as a financing lease. Under the terms of the agreement, the Company received proceeds of approximately $974 (€737) with repayment of the lease occurring over a three-year period beginning in January 2013. In December 2015, this transaction expired resulting in a repurchase of the 3D printing machine by the Company. The Company recognized a net loss of approximately $21 (€19) on the repurchase of the 3D printing machine based on the difference between the purchase price and deferred income on the financing. In addition, the Company leases certain other equipment and vehicles under capital lease arrangements, expiring in various years through 2019. Future maturities of capital leases at December 31, 2015, are approximately as follows: 2016 $ 82 2017 72 2018 7 2019 2 2020 — Thereafter — $ 163 Operating The Company leases various manufacturing and office facilities, machinery and other equipment and vehicles under operating lease arrangements (with initial terms greater than twelve months), expiring in various years through 2020. Future minimum lease payments of operating lease arrangements (with initial terms greater than twelve months) at December 31, 2015, are approximately as follows: 2016 $ 340 2017 259 2018 185 2019 41 2020 18 Thereafter — $ 843 Rent expense under operating lease arrangements was approximately $421, $982 and $1,072 for 2015, 2014 and 2013, respectively.

Accrued Expenses and Other Curr

Accrued Expenses and Other Current Liabilities	12 Months Ended
	Dec. 31, 2015
Payables And Accruals [Abstract]
Accrued Expenses and Other Current Liabilities	Note 12. Accrued Expenses and Other Current Liabilities Accrued expenses and other current liabilities consist of the following at December 31: 2015 2014 Accrued payroll and related costs $ 1,816 $ 2,087 Product warranty reserves 1,308 1,543 Accrued sales commissions 588 951 Liability for uncertain tax positions 781 871 Accrued professional fees 203 405 Accrued license fees 534 392 Other 1,180 1,869 $ 6,410 $ 8,118

Contingencies and Commitments

Contingencies and Commitments	12 Months Ended
	Dec. 31, 2015
Commitments And Contingencies Disclosure [Abstract]
Contingencies and Commitments	Note 13. Contingencies and Commitments The Company and its subsidiaries are subject to various litigation, claims, and proceedings which have been or may be instituted or asserted from time to time in the ordinary course of business. Management does not believe that the outcome of any pending or threatened matters will have a material adverse effect, individually or in the aggregate, on the financial position, results of operations or cash flows of the Company.

Equity-Based Compensation

Equity-Based Compensation	12 Months Ended
	Dec. 31, 2015
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Equity-Based Compensation	Note 14. Equity-Based Compensation On January 24, 2013, the Board of Directors of the Company adopted the 2013 Equity Incentive Plan (the “Plan”). In connection with the adoption of the Plan, 500,000 shares of common stock were reserved for issuance pursuant to the Plan, with automatic increases in such reserve available each year annually on January 1 from 2014 through 2023 equal to the lesser of (i) 3.0% of the total outstanding shares of common stock as of December 31 of the immediately preceding year or (ii) a number of shares of common stock determined by the Board of Directors, provided that the maximum number of shares authorized under the Plan will not exceed 1,992,241 shares, subject to certain adjustments. The following table summarizes the total equity-based compensation expense recognized for awards issued under the Plan: 2015 2014 2013 Equity-based compensation expense recognized: Incentive stock options $ 807 $ 633 $ 580 Restricted stock 918 376 131 Stock bonus awards — 197 — Total equity-based compensation expense before income taxes 1,725 1,206 711 Benefit for income taxes* — — — Total equity-based compensation expense net of income taxes $ 1,725 $ 1,206 $ 711 * The benefit for income taxes from equity-based compensation for each of the periods presented has been determined to be $0 At December 31, 2015, total future compensation expense related to unvested awards yet to be recognized by the Company was approximately $436 for incentive stock options (“ISOs”) and $916 for restricted stock awards. Total future compensation expense related to unvested awards yet to be recognized by the Company is expected to be recognized over a weighted-average remaining vesting period of approximately 1.6 years. Both ISOs and restricted stock awards issued by the Company vest in one-third increments on the first, second and third anniversaries of the date of grant, respectively. Stock bonus awards issued by the Company vested immediately upon issuance. During 2015, there were no ISOs issued by the Company. During 2014 and 2013, the fair value of ISOs was estimated on the date of grant using the Black-Scholes option pricing model with the following assumptions: 2014 2013 Weighted average fair value per ISO $ 9.60 $ 11.03 Volatility 67.00 % 68.70 % Average risk-free interest rate 1.76 % 1.07 % Dividend yield 0.00 % 0.00 % Expected term (years) 6.0 6.0 Expected volatility has been estimated based on historical volatilities of certain peer group companies over the expected term of the awards, due to a lack of historical stock prices for a period at least equal to the expected term of issued awards. The average risk-free rate is based on a weighted average yield curve of risk-free interest rates consistent with the expected term of the awards. Expected dividend yield is based on historical dividend data as well as future expectations. Expected term has been calculated using the simplified method as the Company does not have sufficient historical exercise experience upon which to base an estimate. The activity for ISOs was as follows: Number of ISOs Weighted Average Exercise Price Weighted Average Grant Date Fair Value Outstanding at December 31, 2012 — $ — $ — ISOs granted 180,000 $ 18.00 $ 11.03 ISOs exercised — $ — $ — ISOs forfeited (6,667 ) $ 18.00 $ 11.03 ISOs expired — $ — $ — Outstanding at December 31, 2013 173,333 $ 18.00 $ 11.03 ISOs exercisable at December 31, 2013 — $ — $ — ISOs expected to vest at December 31, 2013 164,852 $ 18.00 $ 11.03 Number of ISOs Weighted Average Exercise Price Weighted Average Grant Date Fair Value Outstanding at December 31, 2013 173,333 $ 18.00 $ 11.03 ISOs granted 62,000 $ 15.74 $ 9.60 ISOs exercised (18,529 ) $ 18.00 $ 11.03 ISOs forfeited (1,667 ) $ 18.00 $ 11.03 ISOs expired — $ — $ — Outstanding at December 31, 2014 215,137 $ 17.35 $ 10.62 ISOs exercisable at December 31, 2014 39,804 $ 18.00 $ 11.03 ISOs expected to vest at December 31, 2014 166,638 $ 17.21 $ 10.53 Number of ISOs Weighted Average Exercise Price Weighted Average Grant Date Fair Value Outstanding at December 31, 2014 215,137 $ 17.35 $ 10.62 ISOs granted — $ — $ — ISOs exercised — $ — $ — ISOs forfeited (3,334 ) $ 16.31 $ 9.96 ISOs expired (833 ) $ 18.00 $ 11.03 Outstanding at December 31, 2015 210,970 $ 17.43 $ 10.67 ISOs exercisable at December 31, 2015 115,472 $ 17.61 $ 10.78 ISOs expected to vest at December 31, 2015 90,898 $ 17.09 $ 10.45 At December 31, 2015, there was no intrinsic value associated with ISOs exercisable or ISOs expected to vest. The weighted average remaining contractual term of ISOs exercisable and ISOs expected to vest at December 31, 2015, was approximately 7.4 and 7.9 years, respectively. ISOs with an aggregate intrinsic value of approximately $312 were exercised by employees during 2014, resulting in proceeds to the Company from the exercise of stock options of approximately $333. The Company received no income tax benefit related to these exercises. There were no exercises during 2015 or 2013. The activity for restricted stock awards was as follows: Shares of Restricted Stock Weighted Average Grant Date Fair Value Outstanding at December 31, 2012 — $ — Restricted shares granted 20,000 $ 23.26 Restricted shares vested — $ — Restricted shares forfeited — $ — Outstanding at December 31, 2013 20,000 $ 23.26 Restricted shares expected to vest at December 31, 2013 20,000 $ 23.26 Shares of Restricted Stock Weighted Average Grant Date Fair Value Outstanding at December 31, 2013 20,000 $ 23.26 Restricted shares granted 67,500 $ 22.69 Restricted shares vested (6,666 ) $ 23.26 Restricted shares forfeited — $ — Outstanding at December 31, 2014 80,834 $ 22.78 Restricted shares expected to vest at December 31, 2014 80,834 $ 22.78 Shares of Restricted Stock Weighted Average Grant Date Fair Value Outstanding at December 31, 2014 80,834 $ 22.78 Restricted shares granted 26,000 $ 13.23 Restricted shares vested (29,164 ) $ 22.82 Restricted shares forfeited — $ — Outstanding at December 31, 2015 77,670 $ 19.57 Restricted shares expected to vest at December 31, 2015 77,670 $ 19.57 Restricted shares vesting during 2015 and 2014 had a fair value of approximately $356 and $282, respectively. There was no restricted share vesting during 2013.

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Income Taxes	Note 15. Income Taxes Prior to Reorganization the Company was a limited liability company whereby its members were taxed on a proportionate share of the Company’s taxable income. Following the merger of The Ex One Company, LLC with and into The ExOne Company, The ExOne Company became a corporation, taxable for federal, state, local and foreign income tax purposes. On January 1, 2013, the Company recorded a net deferred tax asset of approximately $410 based on the difference between the book and tax basis of assets and liabilities as of that date. Due to a history of operating losses by the limited liability company, a valuation allowance of 100% of the initial net deferred tax asset was established. The components of loss before taxes were as follows: 2015 2014 2013 United States $ (13,138 ) $ (15,683 ) $ (9,675 ) Foreign (12,900 ) (6,001 ) 3,728 Loss before income taxes $ (26,038 ) $ (21,684 ) $ (5,947 ) The (benefit) provision for income taxes consisted of the following: 2015 2014 2013 Current Deferred Total Current Deferred Total Current Deferred Total United States $ — $ (20 ) $ (20 ) $ — $ 20 $ 20 $ — $ — $ — Foreign 95 (248 ) (153 ) 290 (151 ) 139 370 — 370 (Benefit) provision for income taxes $ 95 $ (268 ) $ (173 ) $ 290 $ (131 ) $ 159 $ 370 $ — $ 370 The net benefit for deferred income taxes for 2015 and 2014 includes approximately $116 and $54, respectively, associated with net operating loss carryforwards. A reconciliation of the (benefit) provision for income taxes at the United States statutory rate of 34.0% to the effective rate of the Company for the years ended December 31 is as follows: 2015 2014 2013 United States statutory rate (34.0%) $ (8,853 ) $ (7,373 ) $ (2,022 ) (Loss) income of foreign disregarded entity (2,746 ) (212 ) 87 Taxes on foreign operations 648 119 3 Increase in uncertain tax positions — 210 323 Goodwill impairment 1,031 — — Net change in valuation allowances 9,173 6,980 2,029 Permanent differences and other 574 435 (50 ) (Benefit) provision for income taxes $ (173 ) $ 159 $ 370 Effective tax rate 0.7 % (0.7 )% (6.2 )% The components of deferred income tax assets and liabilities consist of the following at December 31: 2015 2014 Deferred tax assets Accounts receivable $ 655 $ 836 Inventories 796 300 Property and equipment — 403 Accrued expenses and other current liabilities 699 849 Net operating loss carryforwards 17,475 7,375 Tax credit carryforwards 779 765 Other 1,447 1,012 Valuation allowance (20,089 ) (11,069 ) Total deferred tax assets 1,762 471 Deferred tax liabilities Property and equipment (943 ) — Other (847 ) (794 ) Total deferred tax liabilities (1,790 ) (794 ) Net deferred tax liabilities* $ (28 ) $ (323 ) * At December 31, 2015 and 2014, net deferred tax liabilities were reflected in other noncurrent liabilities in the consolidated balance sheet. The Company has provided a valuation allowance for its net deferred tax assets as a result of the Company not generating consistent net operating profits. As such, any benefit from deferred taxes in any of the periods presented has been fully offset by changes in the valuation allowance for net deferred tax assets. The Company continues to assess its future taxable income by jurisdiction based on (i) recent historical operating results, (ii) the expected timing of reversal of temporary differences, (iii) various tax planning strategies that the Company may be able to enact in future periods, (iv) the impact of potential operating changes on the business and (v) forecast results from operations in future periods based on available information at the end of each reporting period. To the extent that the Company is able to reach the conclusion that deferred tax assets are realizable based on any combination of the above factors, a reversal of existing valuation allowances may occur. The following table summarizes changes to the Company’s valuation allowances for the years ended December 31: 2015 2014 Beginning balance $ 11,069 $ 5,172 Increase to allowances 9,173 6,980 Foreign currency translation and other adjustments (153 ) (1,083 ) Ending balance $ 20,089 $ 11,069 At December 31, 2015, the Company had approximately $39,949 in net operating loss carryforwards which expire from 2033 to 2035 and $765 in tax credit carryforwards which expire in 2023, to offset the future taxable income of its United States subsidiary. At December 31, 2015, the Company had approximately $2,769 in net operating loss carryforwards which expire from 2016 through 2022, to offset the future taxable income of its Japanese subsidiary. At December 31, 2015, the Company had approximately $11,323 in net operating loss carryforwards which do not expire, to offset the future taxable income of its collective German, Italian and Swedish subsidiaries. The Company has a liability for uncertain tax positions related to certain capitalized expenses and intercompany transactions. At December 31, 2015 and 2014, the liability for uncertain tax positions was approximately $781 and $871, respectively, and is included in accrued expenses and other current liabilities in the consolidated balance sheet. At December 31, 2015 and 2014, the Company had an additional liability for uncertain tax positions related to its ExOne GmbH (Germany) subsidiary of approximately $195 (for both years) which was fully offset against net operating loss carryforwards. At December 31, 2015 and 2014, the Company had an additional liability for uncertain tax positions related to its ExOne KK (Japan) subsidiary of approximately $285 and $159, respectively, which were fully offset against net operating loss carryforwards. A reconciliation of the beginning and ending amount of unrecognized tax benefits at December 31 was as follows: 2015 2014 2013 Beginning balance $ 871 $ 768 $ 416 Increases related to current year tax positions — 210 323 Foreign currency translation adjustments (90 ) (107 ) 29 Ending balance $ 781 $ 871 $ 768 The Company includes interest and penalties related to income taxes as a component of the (benefit) provision for income taxes in the consolidated statement of operations and comprehensive loss. The Company files income tax returns in the United States (effective in 2013), Germany, Italy (effective in 2014), Sweden (effective 2015) and Japan. The following table summarizes tax years remaining subject to examination for each of the Company’s subsidiaries at December 31, 2015: Jurisdiction Tax Years Remaining Subject to Examination United States 2013-2015 Germany* 2010-2015 Italy 2014-2015 Sweden 2015 Japan 2010-2015 * At December 31, 2015, our ExOne GmbH (2010-2013) and ExOne Property GmbH (2013) subsidiaries were under examination by local taxing authorities.

Fair Value Measurements

Fair Value Measurements	12 Months Ended
	Dec. 31, 2015
Fair Value Disclosures [Abstract]
Fair Value Measurements	Note 16. Fair Value Measurements Fair value is defined as the price 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. When determining the fair value measurements for assets and liabilities which are required to be recorded at fair value, the Company considers the principal or most advantageous market in which the Company would transact and the market-based risk measurements or assumptions that market participants would use in pricing the asset or liability, such as inherent risk, transfer restrictions and credit risk. The Company applies the following fair value hierarchy, which prioritizes the inputs used to measure fair value into three levels and bases the categorization within the hierarchy upon the lowest level of input that is available and significant to the fair value measurement: Level 1 Observable inputs such as quoted prices in active markets for identical investments that the Company has the ability to access. Level 2 Inputs include: Quoted prices for similar assets or liabilities in active markets; Quoted prices for identical or similar assets or liabilities in inactive markets; Inputs, other than quoted prices in active markets, that are observable either directly or indirectly; Inputs that are derived principally from, or corroborated by, observable market data by correlation or other means. Level 3 Inputs that are generally unobservable and typically reflect management’s estimates of assumptions that market participants would use in pricing the asset or liability. The Company is required to disclose its estimate of the fair value of material financial instruments, including those recorded as assets or liabilities in its consolidated financial statements. The following table sets forth the fair value of the Company’s liabilities measured on a recurring basis by level at December 31: Level 2015 2014 Contingent consideration* 3 $ — $ 190 * Contingent consideration is included in accrued expenses and other current liabilities in the accompanying consolidated balance sheet. The fair value of contingent consideration associated with the MAM acquisition is determined by using certain forecasts of future profitability of MAM (an unobservable input). The valuation technique utilized by the Company with respect to this instrument is a discounted cash flow model, principally based on the assumption of achievement of the profitability targets stipulated in the earn-out provision. Future expected payments have been discounted using a market interest rate assumption. Terms of the earn-out provision require minimum achievement of revenues and gross profit for the year ended December 31 as follows: 2015 2014* Revenue $ 3,500 $ 2,490 Gross profit $ 875 $ 623 * For 2014, targets are representative of revenues and gross profit for the period from the date of acquisition (March 3, 2014) through December 31, 2014. During 2015, the Company recorded net changes in the fair value of contingent consideration issued in connection with the MAM acquisition of approximately ($190), with a corresponding amount (a net benefit) recorded to selling, general and administrative expenses. Changes in contingent consideration recorded by the Company during 2015 are based on (i) revisions of estimates of revenues and gross profit for MAM for the year ended December 31, 2015 and (ii) the impact of discounting future cash payments on the associated liabilities. During 2014, the Company recorded net changes in the fair value of contingent consideration issued in connection with the MAM acquisition of approximately ($185), with a corresponding amount (a net benefit) recorded to selling, general and administrative expenses. Changes in contingent consideration recorded by the Company during 2015 are based on (i) revisions of estimates of revenue and gross profit for MAM for the period from acquisition (March 3, 2014) through December 31, 2014 and (ii) the impact of discounting future cash payments on the associated liabilities. The following table sets forth a summary of changes in the fair value of the Company’s Level 3 financial instruments: Year Ended December 31, 2015 2014 Beginning balance $ 190 $ — Purchases — — Sales — — Issuances — 375 Settlements — — Realized (gains) losses (193 ) (195 ) Unrealized (gains) losses 3 10 Transfers into Level 3 — — Transfers out of Level 3 — — Ending balance $ — $ 190 The carrying values and fair values of other financial instruments (assets and liabilities) not required to be recorded at fair value were as follows: December 31, December 31, 2015 2014 Carrying Value Fair Value Carrying Value Fair Value Cash and cash equivalents $ 19,342 $ 19,342 $ 36,202 $ 36,202 Current portion of long-term debt $ 138 $ 138 $ 132 $ 132 Current portion of capital and financing leases $ 82 $ 82 $ 346 $ 346 Long-term debt - net of current portion $ 1,812 $ 1,800 $ 1,950 $ 2,022 Capital and financing leases - net of current portion $ 81 $ 81 $ 164 $ 164 The carrying amounts of cash and cash equivalents, current portion of long-term debt and current portion of capital and financing leases approximate fair value due to their short-term maturities. Cash and cash equivalents are classified in Level 1; current portion of long-term debt, current portion of capital and financing leases, long-term debt — net of current portion and capital and financing leases – net of current portion are classified in Level 2.

Customer Concentrations

Customer Concentrations	12 Months Ended
	Dec. 31, 2015
Risks And Uncertainties [Abstract]
Customer Concentrations	Note 17. Customer Concentrations During 2015, 2014 and 2013, the Company conducted a significant portion of its business with a limited number of customers. For 2015, 2014 and 2013 the Company’s five most significant customers represented approximately 19.0%, 23.1% and 25.5% of total revenue, respectively. At December 31, 2015 and 2014, accounts receivable from the Company’s five most significant customers were approximately $4,808

Related Party Transactions

Related Party Transactions	12 Months Ended
	Dec. 31, 2015
Related Party Transactions [Abstract]
Related Party Transactions	Note 18. Related Party Transactions Revenues In December 2014, the Company entered into a sale agreement for a 3D printing machine with a powdered metal company with proprietary powders determined to be a related party based on common control by the Chairman and CEO of the Company. Total consideration for the 3D printing machine (approximately $1,000) was determined to represent a fair market value selling price (based on comparable 3D printing machine sales to third parties) and was approved prior to execution by the Audit Committee of the Board of Directors of the Company. During 2014 and 2015, the Company recorded revenue of approximately $815 and $185, respectively, based on the delivery of products and/or services. At December 31, 2014, the amount due from this customer relating to this transaction was approximately $90 (amount net of the value of undelivered products and/or services due to the customer) and was reflected in accounts receivable – net, on the consolidated balance sheet. All of the proceeds associated with this transaction have been received by the Company at December 31, 2015. In March 2015, the Company entered into a separate sale agreement for a 3D printing machine with the same powdered metal company with proprietary powders described above. Total consideration for the 3D printing machine (approximately $950) was determined to represent a fair market value selling price (based on comparable 3D printing machine sales to third parties) and was approved prior to execution by the Audit Committee of the Board of Directors of the Company. During 2015, the Company recorded revenue of approximately $913 based on the delivery of products and/or services. At December 31, 2015, the Company continued to defer the remaining consideration covered under this transaction (approximately $37) as certain additional products and/or services remained undelivered by the Company. All of the proceeds associated with this transaction have been received by the Company at December 31, 2015. In June 2015, the Company entered into a sale agreement for a 3D printing machine with a multi-national, diversified metals company determined to be a related party on the basis that a member of the Board of Directors of the Company also receives his principal compensation from the related party. Total consideration for the 3D printing machine (approximately $146) was determined to represent a fair market value selling price (based on comparable 3D printing machine sales to third parties) and was approved prior to execution by the Audit Committee of the Board of Directors of the Company. During 2015, the Company recorded revenue of approximately $146 based on the delivery of products and/or services. All of the proceeds associated with this transaction have been received by the Company at December 31, 2015. In December 2015, the Company entered into a separate sale agreement for a 3D printing machine with the same multi-national, diversified metals company described above. Total consideration for the 3D printing machine (approximately $120) was determined to represent a fair market value selling price (based on comparable 3D printing machine sales to third parties) and was approved prior to execution by the Audit Committee of the Board of Directors of the Company. During 2015, the Company recorded revenue of approximately $120 based on the delivery of products and/or services. None of the proceeds associated with this transaction have been received by the Company at December 31, 2015. At December 31, 2015, the amount due from this customer relating to this transaction is reflected in accounts receivable – net, in the consolidated balance sheet. During 2015 and 2014, additional sales of products and/or services to identified related parties were approximately $71 and $56, respectively. There were no additional sales of products and/or services to identified related parties during 2013. Amounts due from these related parties at December 31, 2015 and 2014, were approximately $31 and $30, respectively and are reflected in accounts receivable – net, on the consolidated balance sheet. Expenses In December 2014, the Company entered into a consulting arrangement with Hans J. Sack who was subsequently appointed to the Board of Directors of the Company on December 17, 2014. Total consideration under the consulting arrangement was approximately $75, of which approximately $50 was included in selling, general and administrative expenses in the statement of consolidated operations and comprehensive loss during 2015 based on the services rendered (the remaining amount having been recorded by the Company during 2014). This arrangement was approved by the Audit Committee of the Board of Directors of the Company in connection with the appointment of Hans J. Sack to the Board of Directors of the Company. In March 2015, Hans J. Sack resigned from the Board of Directors of the Company to accept a position as President of the Company. Separate from the consulting arrangement further described above, the Company has purchased certain raw materials and components, website design services and the corporate use of an airplane and leased office space from related parties under common control by the Chairman and CEO of the Company. During 2015, 2014 and 2013, purchases from these related parties were approximately $27, $90 and $185, respectively. None of the transactions met a threshold requiring review and approval by the Audit Committee of the Board of Directors of the Company prior to execution. Amounts due to these related parties at December 31, 2015, were approximately $15 of which approximately $1 and $14 are reflected in accounts payable and accrued expenses and other current liabilities, respectively, in the accompanying consolidated balance sheet. Amounts due to these related parties at December 31, 2014, were approximately $29 of which approximately $1 and $28 are reflected in accounts payable and accrued expenses and other current liabilities, respectively, in the accompanying consolidated balance sheet. During 2013, the Company provided various services to several identified related parties under common control by the Chairman and CEO of the Company, primarily in the form of accounting, finance, information technology and human resource outsourcing. The cost of these services was approximately $133 which were reimbursed to the Company by the respective related parties (recorded as a credit against selling, general and administrative expense in the statement of consolidated operations and comprehensive loss). The provision of these services by the Company to the respective related parties was discontinued by the Company in 2013 following the closing of the initial public offering of the Company. The Company also receives the benefit of the corporate use of an airplane from a related party under common control by the Chairman and CEO of the Company for no consideration. The Company estimates the fair market value of the benefits received during the 2015 and 2014 were approximately $38 and $34, respectively. There were no such benefits received during 2013. Other Refer to Note 9 for further discussion relating to the Company’s revolving credit facility with a related party and Note 20 for further discussion relating to two separate equity offerings in 2016, certain elements of which qualify as related party transactions.

Segment, Product and Geographic

Segment, Product and Geographic Information	12 Months Ended
	Dec. 31, 2015
Segment Reporting [Abstract]
Segment, Product and Geographic Information	Note 19. Segment, Product and Geographic Information The Company manages its business globally in a singular operating segment in which it develops, manufactures and markets 3D printing machines, 3D printed and other products, materials and services. Geographically, the Company conducts its business through wholly-owned subsidiaries in the United States, Germany, Italy, Sweden and Japan. Revenue by product for the year ended December 31 was as follows: 2015 2014 2013 3D printing machines $ 15,464 $ 22,792 $ 24,851 3D printed and other products, materials and services 24,889 21,108 14,629 $ 40,353 $ 43,900 $ 39,480 Geographic information for revenue for the year ended December 31 was as follows (based on the country where the sale originated): 2015 2014 2013 United States $ 19,817 $ 21,115 $ 14,596 Germany 14,174 18,118 14,744 Japan 5,613 4,623 10,140 Italy 684 44 — Sweden 65 — — $ 40,353 $ 43,900 $ 39,480 Geographic information for long-lived assets at December 31 was as follows (based on the physical location of assets): 2015 2014 United States $ 20,984 $ 20,334 Germany 27,417 28,522 Japan 5,210 4,978 Italy 1,213 1,464 Sweden 8 — $ 54,832 $ 55,298

Subsequent Events

Subsequent Events	12 Months Ended
	Dec. 31, 2015
Subsequent Events [Abstract]
Subsequent Events	Note 20. Subsequent Events At Market Issuance Offering On January 8, 2016, the Company announced that it had entered into an At Market Issuance Sales Agreement (“ATM”) with FBR Capital Markets & Co. (“FBR”) and MLV & Co. LLC (“MLV”) pursuant to which FBR and MLV will act as distribution agents in the sale of up to $50,000 in the aggregate of ExOne common equity in “at the market offerings” as defined in Rule 415 under the Securities Act of 1933, as amended. Both FBR and MLV have been identified as related parties to the Company on the basis of significant influence in that a member of the Board of Directors of the Company also serves as a member of the Board of Directors of FBR (which controls MLV). The terms of this transaction were reviewed and approved by a sub-committee of the Board of Directors of the Company (which included each of the members of the Audit Committee of the Board of Directors except for the identified director who also holds a position on the Board of Directors of FBR). Terms of the distribution agreement require a 3.0% commission on the sale of common equity shares under the ATM and a reimbursement of certain legal expenses of approximately $25. Through March 22, 2016, the Company sold 91,940 shares under the ATM at a weighted average selling price of approximately $9.17 per share resulting in gross proceeds of approximately $843. Net proceeds to the Company from the sale of shares under the ATM during this time period were approximately $595 (after deducting offering costs of approximately $248, of which approximately $50 was paid to FBR or MLV relating to the aforementioned reimbursement of certain legal expenses and commissions on the sale of shares under the ATM). Registered Direct Offering to a Related Party On January 11, 2016, the Company announced that it had entered into a subscription agreement with Rockwell Forest Products, Inc. and S. Kent Rockwell for the registered direct offering and sale of 1,423,877 shares of ExOne common equity at a per share price of $9.13 (a $0.50 premium from the closing price on the close of business on January 8, 2016). The terms of this transaction were reviewed and approved by a sub-committee of independent members of the Board of Directors of the Company (which included each of the members of the Audit Committee of the Board of Directors). The sub-committee of independent members of the Board of Directors of the Company were advised on the transaction by an independent financial advisor and independent legal counsel. Concurrent with the approval of this sale of shares under the terms identified, the independent members of the Board of Directors also approved the termination of the Company’s revolving credit facility with RHI Investments, LLC (Note 9). Gross proceeds from the sale of shares in this offering were approximately $13,000. Net proceeds to the Company from the sale of shares in this offering were approximately $12,447 (after deducting offering costs of approximately $553). The Company has evaluated all of its activities and concluded that no other subsequent events have occurred that would require recognition in the consolidated financial statements or disclosure in the notes to the consolidated financial statements, except as described above.

Supplemental Quarterly Financia

Supplemental Quarterly Financial Information	12 Months Ended
	Dec. 31, 2015
Quarterly Financial Information Disclosure [Abstract]
Supplemental Quarterly Financial Information	The ExOne Company and Subsidiaries Supplemental Quarterly Financial Information (unaudited) (in thousands, except per-share amounts) For the Quarter Ended December 31, 2015 September 30, 2015 June 30, 2015 March 31, 2015 Revenue - third party $ 16,057 $ 8,712 $ 7,358 $ 6,791 Revenue - related party 141 152 1,140 2 Total $ 16,198 $ 8,864 $ 8,498 $ 6,793 Gross profit $ 6,069 $ 1,169 $ 1,105 $ — Net loss attributable to ExOne $ (1,219 ) $ (10,077 ) $ (6,898 ) $ (7,671 ) Net loss attributable to ExOne per common share*: Basic $ (0.08 ) $ (0.70 ) $ (0.48 ) $ (0.53 ) Diluted $ (0.08 ) $ (0.70 ) $ (0.48 ) $ (0.53 ) For the Quarter Ended December 31, 2014 September 30, 2014 June 30, 2014 March 31, 2014 Revenue - third party $ 14,926 $ 9,640 $ 11,200 $ 7,263 Revenue - related party 839 9 1 22 Total $ 15,765 $ 9,649 $ 11,201 $ 7,285 Gross profit $ 3,855 $ 2,487 $ 2,496 $ 1,619 Net loss attributable to ExOne $ (7,200 ) $ (4,451 ) $ (4,665 ) $ (5,527 ) Net loss attributable to ExOne per common share*: Basic $ (0.50 ) $ (0.31 ) $ (0.32 ) $ (0.38 ) Diluted $ (0.50 ) $ (0.31 ) $ (0.32 ) $ (0.38 ) * Per-share amounts are calculated independently for each quarter presented; therefore the sum of the quarterly per-share amounts may not equal the per-share amounts for the year.

Summary of Significant Accoun29

Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2015
Accounting Policies [Abstract]
Basis of Presentation and Principles of Consolidation	Basis of Presentation and Principles of Consolidation The ExOne Company (“ExOne”) is a corporation organized under the laws of the state of Delaware. ExOne was formed on January 1, 2013, when The Ex One Company, LLC, a Delaware limited liability company, merged with and into a Delaware corporation, which survived and changed its name to The ExOne Company (the “Reorganization”). As a result of the Reorganization, The Ex One Company, LLC became ExOne, the common and preferred interest holders of The Ex One Company, LLC became holders of common stock and preferred stock, respectively, of ExOne, and the subsidiaries of The Ex One Company, LLC became the subsidiaries of ExOne. The consolidated financial statements include the accounts of ExOne, its wholly-owned subsidiaries, ExOne Americas LLC (United States), ExOne GmbH (Germany), ExOne KK (Japan); effective in August 2013, ExOne Property GmbH (Germany); effective in March 2014, MWT — Gesellschaft für Industrielle Mikrowellentechnik mbH (Germany); effective in May 2014, ExOne Italy S.r.l (Italy); effective in July 2015, ExOne Sweden AB (Sweden); and through March 27, 2013 (see further description below), two variable interest entities (“VIEs”) in which ExOne was identified as the primary beneficiary, Lone Star Metal Fabrication, LLC (“Lone Star”) and Troy Metal Fabricating, LLC (“TMF”). Collectively, the consolidated group is referred to as the “Company”. At December 31, 2012, and through March 27, 2013, ExOne leased property and equipment from Lone Star and TMF. ExOne did not have an ownership interest in Lone Star or TMF and the assets of Lone Star and TMF could only be used to settle obligations of Lone Star and TMF. ExOne was identified as the primary beneficiary of Lone Star and TMF in accordance with the guidance issued by the Financial Accounting Standards Board (“FASB”) on the consolidation of VIEs, as ExOne guaranteed certain long-term debt of both Lone Star and TMF and governed these entities through common ownership. This guidance requires certain VIEs to be consolidated when an enterprise has the power to direct the activities of the VIE that most significantly impact VIE economic performance and who has the obligation to absorb losses or the right to receive benefits of the VIE that could potentially be significant to the VIE. The consolidated financial statements therefore include the accounts of Lone Star and TMF through March 27, 2013. On March 27, 2013, ExOne Americas LLC acquired certain assets, including property and equipment (principally land, buildings and machinery and equipment) held by the two VIEs, and assumed all outstanding debt of such VIEs. Following this transaction, neither of the entities continued to meet the definition of a VIE with respect to ExOne, and as a result, the remaining assets and liabilities of both entities were deconsolidated following the transaction. On February 6, 2013, the Company commenced an initial public offering of 6,095,000 shares of its common stock at a price to the public of $18.00 per share, of which 5,483,333 shares were sold by the Company and 611,667 were sold by a selling stockholder (including consideration of the exercise of the underwriters’ over-allotment option). Following completion of the offering on February 12, 2013, the Company received net proceeds of approximately $91,996 (net of underwriting commissions). On September 9, 2013, the Company commenced a secondary public offering of 3,054,400 shares of its common stock at a price to the public of $62.00 per share, of which 1,106,000 shares were sold by the Company and 1,948,400 were sold by selling stockholders (including consideration of the exercise of the underwriters’ over-allotment option). Following completion of the offering on September 13, 2013, the Company received net proceeds of approximately $65,315 (net of underwriting commissions). The consolidated financial statements of the Company are prepared in conformity with accounting principles generally accepted in the United States of America (“GAAP”). All material intercompany transactions and balances have been eliminated in consolidation.
Liquidity	Liquidity The Company has incurred a net loss in each of its annual periods since its inception. As shown in the accompanying statement of consolidated operations and comprehensive loss, the Company has incurred net losses of approximately $25,865, $21,843 and $6,317 for 2015, 2014 and 2013, respectively. As noted above, in connection with the completion of its initial public offering in February 2013 and secondary public offering in September 2013, the Company received total unrestricted net proceeds from the sale of its common stock of approximately $157,311. At December 31, 2015, the Company had approximately $19,342 in cash and cash equivalents. In addition, in January 2016, the Company entered into separate transactions for additional offerings of sale of its common stock resulting in additional unrestricted net proceeds to the Company (Note 20).
Use of Estimates	Use of Estimates The preparation of these consolidated financial statements requires the Company to make certain judgments, estimates and assumptions regarding uncertainties that affect the reported amounts of assets, liabilities, revenue and expenses and related disclosure of contingent assets and liabilities. Areas that require significant judgments, estimates and assumptions include accounting for accounts receivable (including the allowance for doubtful accounts); inventories (including the allowance for slow-moving and obsolete inventory); product warranty reserves; income taxes (including the valuation allowance on certain deferred tax assets); equity-based compensation; and business combinations (including fair value estimates of contingent consideration) and testing for impairment of goodwill and long-lived assets. The Company bases its estimates on historical experience and on various other assumptions that are believed to be reasonable, the results of which forms the basis for making judgments about the carrying values of assets and liabilities that are not readily apparent from other sources. Actual results may differ from these estimates.
Foreign Currency	Foreign Currency The local currency is the functional currency for significant operations outside of the United States. The determination of the functional currency of an operation is made based upon the appropriate economic and management indicators. Foreign currency assets and liabilities are translated into their United States dollar equivalents based upon year end exchange rates, and are included in stockholders’ equity as a component of other comprehensive loss. Revenues and expenses are translated at average exchange rates. Transaction gains and losses that arise from exchange rate fluctuations are charged to operations as incurred, except for gains and losses associated with certain long-term intercompany transactions for which settlement is not planned or anticipated in the foreseeable future, which are included in other comprehensive loss in the consolidated statement of operations and comprehensive loss. The Company transacts business globally and is subject to risks associated with fluctuating foreign exchange rates. Approximately 50.9%, 51.9% and 63.0% of the consolidated revenue of the Company was derived from transactions outside the United States for 2015, 2014 and 2013, respectively. This revenue is generated primarily from wholly-owned subsidiaries operating in their respective countries and surrounding geographic areas. This revenue is primarily denominated in each subsidiary’s local functional currency, including the Euro and Japanese Yen.
Revenue Recognition	Revenue Recognition The Company derives revenue from the sale of 3D printing machines and 3D printed and other products, materials and services. Revenue is recognized by the Company when (i) persuasive evidence of an arrangement exists, (ii) delivery has occurred or services have been rendered, (iii) selling price is fixed or determinable and (iv) collectability is reasonably assured. The Company enters into arrangements that may provide for multiple deliverables to a customer. Sales of 3D printing machines may also include optional equipment, materials, replacement components and services (installation, training and other services, including maintenance services and/or an extended warranty). The Company identifies all products and services that are to be delivered separately under an arrangement and allocates revenue to each based on their relative fair value. Fair values are generally established based on the prices charged when sold separately by the Company (vendor specific objective evidence). The allocated revenue for each deliverable is then recognized ratably based on relative fair values of the components of the sale. In the absence of vendor specific objective evidence or third party evidence in leading to a relative fair value for a sale component, the Company’s best estimate of selling price is used. The Company also evaluates the impact of undelivered items on the functionality of delivered items for each sales transaction and, where appropriate, defers revenue on delivered items when that functionality has been affected. Functionality is determined to be met if the delivered products or services represent a separate earnings process. Certain of the Company’s arrangements for 3D printing machines contain acceptance provisions for which the Company must determine whether it can objectively demonstrate that either company-specific or customer-specific criteria identified in such provisions have been met prior to recognizing revenue on the transaction. To the extent that the Company is able to effectively demonstrate that specific criteria are met, revenue is recognized at the time of delivery (generally when title and risk and rewards of ownership have transferred to the customer), otherwise revenue is deferred until formal acceptance is provided from the customer. The Company generally provides customers with a standard twelve month warranty on its 3D printing machines. The standard warranty is not treated as a separate service because the standard warranty is an integral part of the sale of the 3D printing machine. At the time of sale, a liability is recorded (with an offset to cost of sales in the statement of operations and comprehensive loss) based upon the expected cost of replacement parts and labor to be incurred over the life of the standard warranty. Following the standard warranty period, the Company offers its customers optional maintenance service contracts or extended warranties. Deferred maintenance service revenues are generally recognized when the maintenance services are performed since the Company has historical evidence that indicates that the costs of performing the services under the contract are not incurred on a straight-line basis. The Company sells equipment with embedded software to its customers. The embedded software is not sold separately and it is not a significant focus of the Company’s marketing effort. The Company does not provide post-contract customer support specific to the software or incur significant costs that are within the scope of FASB guidance on accounting for software to be leased or sold. Additionally, the functionality that the software provides is marketed as part of the overall product. The software embedded in the equipment is incidental to the equipment as a whole such that the FASB guidance referenced above is not applicable. Sales of these products are recognized in accordance with FASB guidance on accounting for multiple-element arrangements. Shipping and handling costs billed to customers are included in revenue in the consolidated statement of operations and comprehensive loss. Costs incurred by the Company associated with shipping and handling are included in cost of sales in the consolidated statement of operations and comprehensive loss. In assessing collectability as part of the revenue recognition process, the Company considers a number of factors in its evaluation of the creditworthiness of the customer, including past due amounts, past payment history, and current economic conditions. If it is determined that collectability cannot be reasonably assured, the Company will defer recognition of revenue until collectability is assured. For 3D printing machines, the Company’s terms of sale vary by transaction. To reduce credit risk in connection with 3D printing machine sales, the Company may, depending upon the circumstances, require certain amounts be prepaid. In some circumstances, the Company may require payment in full and may require international customers to furnish letters of credit. These prepayments are reported as deferred revenue and customer prepayments in the consolidated balance sheet. For 3D printed and other products and materials, the Company’s terms of sale generally require payment within 30 to 60 days after delivery, although the Company also recognizes that longer payment periods are customary in some countries where it transacts business. Service arrangements are generally billed in accordance with specific contract terms which typically correspond to performance of the related services. The Company has entered into certain contracts for the sale of its products and services with the federal government under fixed-fee, cost reimbursable and time and materials arrangements. With respect to cost reimbursable arrangements with the federal government, the Company generally bills for products and services in accordance with provisional rates as determined by the Company. To the extent that provisional rates billed under these contracts differ from actual experience, a billing adjustment (through revenue) is made in the period in which the difference is identified (generally upon completion of its annual Incurred Cost Submission filing as required by the federal government). For 2015, 2014 and 2013, revenues and any adjustments related to these contracts were not significant.
Cash and Cash Equivalents	Cash and Cash Equivalents The Company considers all highly liquid instruments with maturities when purchased of three months or less to be cash equivalents. The Company’s policy is to invest cash in excess of short-term operating and debt-service requirements in such cash equivalents. These instruments are stated at cost, which approximates fair value because of the short maturity of the instruments. The Company maintains cash balances with financial institutions located in the United States, Germany, Italy, Sweden and Japan. The Company places its cash with high quality financial institutions and believes its risk of loss is limited; however, at times, account balances may exceed international and federally insured limits. The Company has not experienced any losses associated with these cash balances.
Restricted Cash	Restricted Cash The Company is required to maintain a cash collateral balance to offset certain short-term, unsecured lending commitments from a financial institution associated with the Company’s corporate credit card program. This balance is considered legally restricted by the Company. Restricted cash at December 31, 2015, was approximately $330 and is included in prepaid expenses and other current assets in the consolidated balance sheet. There was no such restriction on cash balances at December 31, 2014.
Accounts Receivable	Accounts Receivable Accounts receivable are reported at their net realizable value. The Company’s estimate of the allowance for doubtful accounts related to trade receivables is based on the Company’s evaluation of customer accounts with past-due outstanding balances or specific accounts for which it has information that the customer may be unable to meet its financial obligations. Based upon review of these accounts, and management’s analysis and judgment, the Company records a specific allowance for that customer’s accounts receivable balance to reduce the outstanding receivable balance to the amount expected to be collected. The allowance is re-evaluated and adjusted periodically as additional information is received that impacts the allowance amount reserved. At December 31, 2015 and 2014, the allowance for doubtful accounts was approximately $1,920 and $2,431, respectively. During 2015 the Company recorded a net credit of approximately ($254) associated with its provision for bad debts, as reversals of previously recorded allowances (based on collections of the related accounts receivable) exceeded provisions recorded. During 2014 and 2013 the Company recorded provisions for bad debts of approximately $2,391 and $152, respectively, associated with customer balances for which collectability became uncertain as a result of deteriorating credit quality based on either customer-specific or macroeconomic factors.
Inventories	Inventories The Company values all of its inventories at the lower of cost, as determined on the first-in, first-out method or market value. Overhead is allocated to work in process and finished goods based upon normal capacity of the Company’s production facilities. Fixed overhead associated with production facilities that are being operated below normal capacity are recognized as a period expense rather than being capitalized as a product cost. An allowance for slow-moving and obsolete inventories is provided based on historical experience and anticipated product demand. These provisions reduce the cost basis of the respective inventories and are recorded as a charge to cost of sales.
Property and Equipment	Property and Equipment Property and equipment are recorded at cost and depreciated on a straight-line basis over the estimated useful lives of the related assets, generally three to forty years. Leasehold improvements are amortized on a straight-line basis over the shorter of (i) their estimated useful lives or (ii) the estimated or contractual lives of the related leases. Gains or losses from the sale of assets are recognized upon disposal or retirement of the related assets and are generally recorded in cost of sales in the statement of consolidated operations and comprehensive loss. Repairs and maintenance are charged to expense as incurred. The Company evaluates long-lived assets for impairment whenever events or changes in circumstances indicate that the carrying amount of such assets (asset group) may not be recoverable. Recoverability of assets is determined by comparing the estimated undiscounted net cash flows of the operations related to the assets (asset group) to their carrying amount. An impairment loss would be recognized when the carrying amount of the assets (asset group) exceeds the estimated undiscounted net cash flows. The amount of the impairment loss to be recorded is calculated as the excess of carrying value of assets (asset group) over their fair value. The determination of what constitutes an asset group, the associated undiscounted net cash flows, the fair value of assets (asset group) and the estimated useful lives of assets require significant judgments and estimates by management. No impairment loss was recorded by the Company during 2015, 2014 or 2013 (Note 7).
Goodwill	Goodwill Goodwill represents the excess of purchase price over the fair value of identifiable net assets of acquired entities. Goodwill is not amortized; instead, it is reviewed for impairment annually or more frequently if indicators of impairment exist (a triggering event) or if a decision is made to sell or exit a business. A significant amount of judgment is involved in determining if an indicator of impairment has occurred. Such indicators may include deterioration in general economic conditions, negative developments in equity and credit markets, including a significant decline in an entity’s market capitalization, adverse changes in the markets in which an entity operates, increases in input costs that have a negative effect on earnings and cash flows, or a trend of negative or declining cash flows, among others. Goodwill is allocated among and evaluated for impairment at the reporting unit level, which is defined as an operating segment or one level below an operating segment (an operating segment component). Based on an evaluation of its operational management and reporting structure, the Company has determined that it operates as a single operating segment, operating segment component, and reporting unit. In reviewing goodwill for impairment, an entity has the option to first assess qualitative factors to determine whether the existence of events or circumstances leads to a determination that it is more likely than not (greater than 50%) that the estimated fair value of a reporting unit is less than its carrying amount. If an entity elects to perform a qualitative assessment and determines that an impairment is more likely than not, the entity is then required to perform a two-step quantitative impairment test (described below), otherwise no further analysis is required however, it will continue to be evaluated at least annually as described above. An entity also may elect not to perform the qualitative assessment and, instead, proceed directly to the two-step quantitative impairment test. The ultimate outcome of the goodwill impairment review for a reporting unit should be the same whether an entity chooses to perform the qualitative assessment or proceeds directly to the two-step quantitative impairment test. Under the qualitative assessment, various events and circumstances (or factors) that would affect the estimated fair value of a reporting unit are identified (similar to impairment indicators above). These factors are then classified by the type of impact they would have on the estimated fair value using positive, neutral, and adverse categories based on current business conditions. Additionally, an assessment of the level of impact that a particular factor would have on the estimated fair value is determined using high, medium, and low weighting. Under the two-step quantitative impairment test, the evaluation of impairment involves comparing the current fair value of a reporting unit to its carrying value, including goodwill (step 1). The Company determines fair value through a combination of the market approach and income approach. The market approach includes consideration of the Company’s market capitalization (as a single reporting unit entity) along with consideration of other factors that could influence the use of market capitalization as a fair value estimate, including premiums or discounts to be applied based on both market and entity-specific data. The income approach includes consideration of present value techniques, principally the use of a discounted cash flow model. The development of fair value under both approaches requires the use of significant assumptions and estimates by management. In the event the estimated fair value of a reporting unit is less than the carrying value (step 1), additional analysis would be required (step 2). The additional analysis (step 2) would compare the carrying amount of the reporting unit’s goodwill with the implied fair value of that goodwill, which may involve the use of valuation experts. The implied fair value of goodwill is the excess of the fair value of the reporting unit over the fair value amounts assigned to all of the assets and liabilities of that unit as if the reporting unit was acquired in a business combination and the fair value of the reporting unit represented the purchase price. If the carrying value of goodwill exceeds its implied fair value, an impairment loss equal to such excess would be recognized, which could significantly and adversely impact reported results of operations. During the quarter ended September 30, 2015, as a result of the significant decline in market capitalization of the Company and continued operating losses and cash flow deficiencies, the Company identified a triggering event requiring an interim test for impairment of goodwill at the reporting unit level. In performing the impairment test for goodwill, the Company determined the carrying amount of goodwill to be in excess of the implied fair value of goodwill. As a result, the Company recognized an impairment loss of approximately $4,419 (Note 7).
Contingent Consideration	Contingent Consideration The Company records contingent consideration resulting from a business combination at its fair value on the date of acquisition. Each reporting period thereafter, the Company revalues these obligations and records increases or decreases in their fair value as a charge (credit) to selling, general and administrative costs within the statement of consolidated operations and comprehensive loss. Changes in the fair value of contingent consideration obligations can result from adjustments to (i) forecast revenues, profitability or a combination thereto or (ii) discount rates. These fair value measurements represent Level 3 measurements, as they are based on significant unobservable inputs.
Product Warranty Reserves	Product Warranty Reserves Substantially all of the Company’s 3D printing machines are covered by a standard twelve month warranty. At the time of sale, a liability is recorded (with an offset to cost of sales in the statement of operations and comprehensive loss) based upon the expected cost of replacement parts and labor to be incurred over the life of the standard warranty. Expected cost is estimated using historical experience for similar products. The Company periodically assesses the adequacy of the product warranty reserves based on changes in these factors and records any necessary adjustments if actual experience indicates that adjustments are necessary. Future claims experience could be materially different from prior results because of the introduction of new, more complex products, a change in the Company’s warranty policy in response to industry trends, competition or other external forces, or manufacturing changes that could impact product quality. In the event that the Company determines that its current or future product repair and replacement costs exceed estimates, an adjustment to these reserves would be charged to cost of sales in the statement of consolidated operations and comprehensive loss in the period such a determination is made. At December 31, 2015 and 2014, product warranty reserves were approximately $1,308 and $1,543, respectively, and were included in accrued expenses and other current liabilities in the consolidated balance sheet.
Income Taxes	Income Taxes The (benefit) provision for income taxes is determined using the asset and liability approach of accounting for income taxes. Under this approach, the (benefit) provision for income taxes represents income taxes paid or payable (or received or receivable) for the current year plus the change in deferred taxes during the year. Deferred taxes represent the future tax consequences expected to occur when the reported amounts of assets and liabilities are recovered or paid, and result from differences between the financial and tax bases of assets and liabilities and are adjusted for changes in tax rates and tax laws when enacted. Valuation allowances are established when necessary to reduce deferred tax assets to the amount expected to be realized. The Company’s subsidiaries in Germany, Italy, Sweden and Japan are taxed as corporations under the taxing regulations of those respective countries. As a result, the consolidated statement of operations and comprehensive loss includes a (benefit) provision for income taxes related to these foreign jurisdictions. Any undistributed earnings are intended to be permanently reinvested in the respective subsidiaries. The Company recognizes the tax benefit from an uncertain tax position only if it is more likely than not that the tax position will be sustained on examination by the taxing authorities based upon the technical merits of the position. The tax benefits recognized in the consolidated financial statements from such positions are then measured based upon the largest amount that has a greater than 50% likelihood of being realized upon settlement. Tax benefits that do not meet the more likely than not criteria are recognized when effectively settled, which generally means that the statute of limitations has expired or that appropriate taxing authority has completed its examination even through the statute of limitations remains open. Interest and penalties related to uncertain tax positions are recognized as part of the (benefit) provision for income taxes in the consolidated statement of operations and comprehensive loss and are accrued beginning in the period that such interest and penalties would be applicable under relevant tax law until such time that the related tax benefits are recognized.
Taxes on Revenue Producing Transactions	Taxes on Revenue Producing Transactions Taxes assessed by governmental authorities on revenue producing transactions, including sales, excise, value added and use taxes, are recorded on a net basis (excluded from revenue) in the consolidated statement of operations and comprehensive loss.
Research and Development	Research and Development The Company is involved in research and development of new methods and technologies relating to its products. Research and development expenses are charged to operations as they are incurred. The Company capitalizes the cost of materials, equipment and facilities that have alternative future uses in research and development projects or otherwise.
Advertising	Advertising Advertising costs are charged to expense as incurred, and were not significant for 2015, 2014 or 2013.
Defined Contribution Plan	Defined Contribution Plan The Company sponsors a defined contribution savings plan under section 401(k) of the Internal Revenue Code. Under the plan, participating employees in the United States may elect to defer a portion of their pre-tax earnings, up to the Internal Revenue Service’s annual contribution limit. The Company makes discretionary matching contributions of 50% of the first 8% of employee contributions, subject to certain Internal Revenue Service limitations. The Company’s matching contributions to the plan were approximately $365, $269 and $92 in 2015, 2014 and 2013, respectively.
Equity-Based Compensation	Equity-Based Compensation The Company recognizes compensation expense for equity-based grants using the straight-line attribution method, in which the expense (net of estimated forfeitures) is recognized ratably over the requisite service period based on the grant date fair value. Fair value of equity-based awards is estimated on the date of grant using the Black-Scholes pricing model.
Recently Adopted Accounting Guidance	Recently Adopted Accounting Guidance On January 1, 2014, the Company adopted FASB guidance changing the requirements of the Company’s reporting of amounts reclassified out of accumulated other comprehensive income (loss). These changes require an entity to report the effect of significant reclassifications out of accumulated other comprehensive income (loss) on the respective line items in net income (loss) if the amount being reclassified is required to be reclassified in its entirety to net income (loss). For other amounts that are not required to be reclassified in their entirety to net income (loss) in the same reporting period, an entity is required to cross-reference other disclosures that provide additional detail about those amounts. These requirements are to be applied to each component of accumulated other comprehensive income (loss). Other than additional disclosure requirements, the adoption of these changes did not have a significant impact on the consolidated financial statements of the Company. On January 1, 2015, the Company adopted FASB guidance clarifying the presentation of unrecognized tax benefits when a net operating loss carryforward, or similar tax loss or a tax credit carryforward exists. The amendment requires that unrecognized tax benefits be presented in the consolidated financial statements as a reduction to a deferred tax asset for a net operating loss carryforward, a similar tax loss, or a tax credit carryforward, unless certain exceptions exist. Previously, there was diversity in practice as no explicit guidance existed. As the Company had previously followed the now required presentation, the adoption of this guidance did not have a material impact on the consolidated financial statements of the Company. In November 2015, the FASB issued changes to the balance sheet classification of deferred taxes, which the Company elected to early adopt. These changes simplify the presentation of deferred income taxes by requiring all deferred income tax assets and liabilities to be classified as noncurrent in a classified balance sheet. The current requirement that deferred tax assets and liabilities of a tax-paying component of an entity be offset and presented as a single amount is not affected by these changes. The Company has elected to retrospectively apply the adoption of this guidance, which has resulted in a reclassification within the consolidated balance sheet of deferred income tax amounts at December 31, 2014. This reclassification has resulted in a decrease to accrued expenses and other current liabilities of approximately $306, a decrease in other noncurrent assets of approximately $303 and an increase in other noncurrent liabilities of approximately $3 as compared to amounts previously reported.
Recently Issued Accounting Guidance	Recently Issued Accounting Guidance In May 2014, the FASB issued changes to the recognition of revenue from contracts with customers. These changes created a comprehensive framework for all entities in all industries to apply in the determination of when to recognize revenue, and, therefore, supersede virtually all existing revenue recognition requirements and guidance. This framework is expected to provide a consistent and comparable methodology for revenue recognition. The core principle of the guidance is that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. To achieve this principle, an entity should apply the following steps: (i) identify the contract(s) with a customer, (ii) identify the performance obligations in the contract(s), (iii) determine the transaction price, (iv) allocate the transaction price to the performance obligations in the contract(s), and (v) recognize revenue when, or as, the entity satisfies a performance obligation. These changes become effective for the Company on January 1, 2019, or January 1, 2018, in the event that the Company no longer qualifies as an “emerging growth company” (“EGC”) under the Jumpstart Our Business Startups Act of 2012 (the “JOBs Act”). Management is currently evaluating the potential impact of these changes on the consolidated financial statements of the Company. In August 2014, the FASB issued changes to the disclosure of uncertainties about an entity’s ability to continue as a going concern. Under GAAP, continuation of a reporting entity as a going concern is presumed as the basis for preparing financial statements unless and until the entity’s liquidation becomes imminent. Even if an entity’s liquidation is not imminent, there may be conditions or events that raise substantial doubt about the entity’s ability to continue as a going concern. Because there is no guidance in GAAP about management’s responsibility to evaluate whether there is substantial doubt about an entity’s ability to continue as a going concern or to provide related note disclosures, there is diversity in practice whether, when, and how an entity discloses the relevant conditions and events in its financial statements. As a result, these changes require an entity’s management to evaluate whether there are conditions or events, considered in the aggregate, that raise substantial doubt about the entity’s ability to continue as a going concern within one year after the date that financial statements are issued. Substantial doubt is defined as an indication that it is probable that an entity will be unable to meet its obligations as they become due within one year after the date that financial statements are issued. If management has concluded that substantial doubt exists, then the following disclosures should be made in the financial statements: (i) principal conditions or events that raised the substantial doubt, (ii) management’s evaluation of the significance of those conditions or events in relation to the entity’s ability to meet its obligations, (iii) management’s plans that alleviated the initial substantial doubt or, if substantial doubt was not alleviated, management’s plans that are intended to at least mitigate the conditions or events that raise substantial doubt, and (iv) if the latter in (iii) is disclosed, an explicit statement that there is substantial doubt about the entity’s ability to continue as a going concern. These changes become effective for the Company on December 31, 2016. Subsequent to adoption, this guidance will need to be applied by management at the end of each annual period and interim period therein to determine what, if any, impact there will be on the consolidated financial statements of the Company in a given reporting period. In April 2015, the FASB issued changes to the presentation of debt issuance costs in financial statements. These changes require an entity to present such costs in the balance sheet as a direct deduction from the related debt liability rather than as an asset, with an exception for line of credit arrangements. Amortization of debt issuance costs will continue to be reported as interest expense. These changes become effective for the Company on December 31, 2016. Early adoption is permitted. The new guidance will be applied retrospectively to each prior period presented. Management has determined that the adoption of these changes will not have a significant impact on the consolidated financial statements of the Company In July 2015, the FASB issued changes to the measurement of inventories accounted for under any method other than last in, first out or the retail method. These changes require such inventories to be measured at the lower of cost and net realizable value, with net realizable value defined as the estimated selling price in the normal course of business, less reasonably predictable costs of completion, disposal and transportation. These changes become effective for the Company on January 1, 2017. Early adoption is permitted. The new guidance will be applied prospectively in the interim or annual period adopted. Management has determined that the adoption of these changes will not have an impact on the consolidated financial statements of the Company . In February 2016, the FASB issued changes to the accounting for leases. Under the revised guidance, lessees will be required to recognize the following for all leases (with the exception of short-term leases) at the commencement date: (i) a lease liability, which is a lessee‘s obligation to make lease payments arising from a lease, measured on a discounted basis; and (ii) a right-of-use asset, which is an asset that represents the lessee’s right to use, or control the use of, a specified asset for the lease term. Under the revised guidance, lessor accounting is largely unchanged and lessees will no longer be provided with a source of off-balance sheet financing. These changes become effective for the Company on January 1, 2019. Early adoption is permitted. Lessees (for capital and operating leases) and lessors (for sales-type, direct financing, and operating leases) must apply a modified retrospective transition approach for leases existing at, or entered into after, the beginning of the earliest comparative period presented in the consolidated financial statements. The modified retrospective approach would not require any transition accounting for leases that expired before the earliest comparative period presented. Lessees and lessors may not apply a full retrospective transition approach. Management is currently evaluating the potential impact of these changes on the consolidated financial statements of the Company .
Loss Per Share	The Company presents basic and diluted loss per common share amounts. Basic loss per share is calculated by dividing net loss available to ExOne common shareholders by the weighted average number of common shares outstanding during the applicable period. Diluted loss per share is calculated by dividing net loss available to ExOne common shareholders by the weighted average number of common shares and common equivalent shares outstanding during the applicable period.

Accumulated Other Comprehensi30

Accumulated Other Comprehensive Loss (Tables)	12 Months Ended
	Dec. 31, 2015
Equity [Abstract]
Summary of Changes in the Components of Accumulated Other Comprehensive Loss	The following table summarizes changes in the components of accumulated other comprehensive loss: For the years ended December 31, 2015 2014 2013 Foreign currency translation adjustments Balance at beginning of period $ (8,203 ) $ (352 ) $ (174 ) Other comprehensive loss (5,332 ) (7,851 ) (178 ) Balance at end of period $ (13,535 ) $ (8,203 ) $ (352 )

Loss Per Share (Tables)

Loss Per Share (Tables)	12 Months Ended
	Dec. 31, 2015
Earnings Per Share [Abstract]
Computation of Basic and Diluted Net Loss Attributable to ExOne Per Common Share	The information used to compute basic and diluted net loss attributable to ExOne per common share was as follows: For the years ended December 31, 2015 2014 2013 Net loss attributable to ExOne $ (25,865 ) $ (21,843 ) $ (6,455 ) Less: Preferred stock dividends declared — — (152 ) Net loss available to ExOne common shareholders $ (25,865 ) $ (21,843 ) $ (6,607 ) Weighted average shares outstanding (basic and diluted) 14,427,956 14,411,054 12,838,230 Net loss attributable to ExOne per common share: Basic $ (1.79 ) $ (1.52 ) $ (0.51 ) Diluted $ (1.79 ) $ (1.52 ) $ (0.51 )

Acquisitions (Tables)

Acquisitions (Tables)	12 Months Ended
	Dec. 31, 2015
MAM Corporation [Member]
Final Allocation of Purchase Price	The following table summarizes the final allocation of purchase price: Accounts receivable $ 209 Inventories 224 Prepaid expenses and other current assets 15 Property and equipment 2,998 Intangible assets 503 Goodwill 1,407 Total assets 5,356 Accounts payable 56 Accrued expenses and other current liabilities 45 Long-term debt 338 Total liabilities 439 Total purchase price $ 4,917
Schedule of Allocation of Purchase Price to Net Assets Acquired and Liabilities	The allocation of the purchase price to the net assets acquired and liabilities assumed resulted in the recognition of the following intangible assets: Amount Economic Life (in years) Customer relationships $ 464 7 Trade name 24 5 Noncompetition agreement 15 3 $ 503
MWT Corporation [Member]
Final Allocation of Purchase Price	The following table summarizes the final allocation of purchase price: Cash and cash equivalents $ 201 Accounts receivable* 118 Inventories 476 Prepaid expenses and other current assets 29 Property and equipment 21 Intangible assets 1,704 Goodwill 3,685 Total assets 6,234 Accounts payable 128 Accrued expenses and other current liabilities 605 Deferred revenue and customer prepayments* 195 Deferred income taxes 492 Total liabilities 1,420 Total purchase price $ 4,814 * Included in accounts receivable and deferred revenue and customer prepayments were amounts due to MWT and the Company at the date of acquisition of approximately $117 and $195, respectively. These amounts were settled between the parties immediately following completion of the acquisition, resulting in no impact to the consolidated financial statements of the Company.
Schedule of Allocation of Purchase Price to Net Assets Acquired and Liabilities	The allocation of the purchase price to the net assets acquired and liabilities assumed resulted in the recognition of the following intangible assets: Amount Economic Life (in years) Unpatented technology $ 1,668 4 Trade name 36 4 $ 1,704

Inventories (Tables)

Inventories (Tables)	12 Months Ended
	Dec. 31, 2015
Inventory Disclosure [Abstract]
Schedule of Inventories	Inventories consist of the following at December 31: 2015 2014 Raw materials and components $ 9,467 $ 10,838 Work in process 6,048 4,221 Finished goods 4,324 1,955 $ 19,839 $ 17,014

Property and Equipment (Tables)

Property and Equipment (Tables)	12 Months Ended
	Dec. 31, 2015
Property, Plant and Equipment [Line Items]
Summary of Property and Equipment	Property and equipment consist of the following at December 31: 2015 2014 Economic Life (in years) Land $ 6,969 $ 7,154 N/A Buildings and related improvements 28,498 27,031 5 - 40 Machinery and equipment 23,935 18,510 3 - 20 Other 5,995 4,935 3 - 20 65,397 57,630 Less: Accumulated depreciation (11,017 ) (7,213 ) 54,380 50,417 Construction-in-progress 452 4,881 Property and equipment - net $ 54,832 $ 55,298
Future Minimum Lease Payments of Operating Lease Arrangements	Future minimum lease payments of operating lease arrangements (with initial terms greater than twelve months) at December 31, 2015, are approximately as follows: 2016 $ 340 2017 259 2018 185 2019 41 2020 18 Thereafter — $ 843
Machinery and Equipment [Member]
Property, Plant and Equipment [Line Items]
Future Minimum Lease Payments of Operating Lease Arrangements	Minimum future rentals of machinery and equipment under non-cancellable arrangements at December 31, 2015, are as follows: 2016 $ 859 2017 439 2018 118 2019 — 2020 — Thereafter — $ 1,416

Impairment (Tables)

Impairment (Tables)	12 Months Ended
	Dec. 31, 2015
Asset Impairment Charges [Abstract]
Schedule of Changes in Carrying Amount of Goodwill	The following table details the changes in the carrying amount of goodwill for the year ended December 31: 2015 2014 Beginning balance $ 4,665 $ — Acquisition of businesses — 5,092 Foreign currency translation adjustments (246 ) (427 ) Impairment (4,419 ) — Ending balance $ — $ 4,665

Intangible Assets (Tables)

Intangible Assets (Tables)	12 Months Ended
	Dec. 31, 2015
Goodwill And Intangible Assets Disclosure [Abstract]
Schedule of Intangible Assets	Intangible assets, which are included in other noncurrent assets on the accompanying consolidated balance sheet, were as follows: December 31, 2015 Gross Amount Accumulated Amortization Net Unpatented technology $ 1,323 $ (606 ) $ 717 Customer relationships 464 (122 ) 342 Trade names 53 (22 ) 31 Noncompetition agreement 15 (9 ) 6 $ 1,855 $ (759 ) $ 1,096 December 31, 2014 Gross Amount Accumulated Amortization Net Unpatented technology $ 1,474 $ (307 ) $ 1,167 Customer relationships 464 (55 ) 409 Trade names 56 (11 ) 45 Noncompetition agreement 15 (4 ) 11 $ 2,009 $ (377 ) $ 1,632
Future Estimated Amortization Expense Related to the Intangible assets	Future estimated amortization expense related to the intangible assets at December 31, 2015, is approximately as follows: 2016 $ 415 2017 410 2018 127 2019 67 2020 66 Thereafter 11 $ 1,096

Long-Term Debt (Tables)

Long-Term Debt (Tables)	12 Months Ended
	Dec. 31, 2015
Debt Disclosure [Abstract]
Components of Long-Term Debt	Long-term debt consists of the following at December 31: 2015 2014 Building note payable to a United States bank $ 1,950 $ 2,082
Future Maturities of Long-Term Debt	Future maturities of long-term debt at December 31, 2015, are approximately as follows: 2016 $ 138 2017 139 2018 142 2019 150 2020 158 Thereafter 1,223 $ 1,950

Leases (Tables)

Leases (Tables)	12 Months Ended
	Dec. 31, 2015
Debt Disclosure [Abstract]
Future Maturities of Capital Leases	Future maturities of capital leases at December 31, 2015, are approximately as follows: 2016 $ 82 2017 72 2018 7 2019 2 2020 — Thereafter — $ 163
Future Minimum Lease Payments of Operating Lease Arrangements	Future minimum lease payments of operating lease arrangements (with initial terms greater than twelve months) at December 31, 2015, are approximately as follows: 2016 $ 340 2017 259 2018 185 2019 41 2020 18 Thereafter — $ 843

Accrued Expenses and Other Cu39

Accrued Expenses and Other Current Liabilities (Tables)	12 Months Ended
	Dec. 31, 2015
Payables And Accruals [Abstract]
Schedule of Accrued Expenses and Other Current Liabilities	Accrued expenses and other current liabilities consist of the following at December 31: 2015 2014 Accrued payroll and related costs $ 1,816 $ 2,087 Product warranty reserves 1,308 1,543 Accrued sales commissions 588 951 Liability for uncertain tax positions 781 871 Accrued professional fees 203 405 Accrued license fees 534 392 Other 1,180 1,869 $ 6,410 $ 8,118

Equity-Based Compensation (Tabl

Equity-Based Compensation (Tables)	12 Months Ended
	Dec. 31, 2015
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Summary of Equity-Based Compensation Expense	The following table summarizes the total equity-based compensation expense recognized for awards issued under the Plan: 2015 2014 2013 Equity-based compensation expense recognized: Incentive stock options $ 807 $ 633 $ 580 Restricted stock 918 376 131 Stock bonus awards — 197 — Total equity-based compensation expense before income taxes 1,725 1,206 711 Benefit for income taxes* — — — Total equity-based compensation expense net of income taxes $ 1,725 $ 1,206 $ 711 * The benefit for income taxes from equity-based compensation for each of the periods presented has been determined to be $0
Assumptions for Fair Value of ISOs Estimated on the Date of Grant Using the Black-Scholes Option	During 2014 and 2013, the fair value of ISOs was estimated on the date of grant using the Black-Scholes option pricing model with the following assumptions: 2014 2013 Weighted average fair value per ISO $ 9.60 $ 11.03 Volatility 67.00 % 68.70 % Average risk-free interest rate 1.76 % 1.07 % Dividend yield 0.00 % 0.00 % Expected term (years) 6.0 6.0
Summary of Activity for ISOs	The activity for ISOs was as follows: Number of ISOs Weighted Average Exercise Price Weighted Average Grant Date Fair Value Outstanding at December 31, 2012 — $ — $ — ISOs granted 180,000 $ 18.00 $ 11.03 ISOs exercised — $ — $ — ISOs forfeited (6,667 ) $ 18.00 $ 11.03 ISOs expired — $ — $ — Outstanding at December 31, 2013 173,333 $ 18.00 $ 11.03 ISOs exercisable at December 31, 2013 — $ — $ — ISOs expected to vest at December 31, 2013 164,852 $ 18.00 $ 11.03 Number of ISOs Weighted Average Exercise Price Weighted Average Grant Date Fair Value Outstanding at December 31, 2013 173,333 $ 18.00 $ 11.03 ISOs granted 62,000 $ 15.74 $ 9.60 ISOs exercised (18,529 ) $ 18.00 $ 11.03 ISOs forfeited (1,667 ) $ 18.00 $ 11.03 ISOs expired — $ — $ — Outstanding at December 31, 2014 215,137 $ 17.35 $ 10.62 ISOs exercisable at December 31, 2014 39,804 $ 18.00 $ 11.03 ISOs expected to vest at December 31, 2014 166,638 $ 17.21 $ 10.53 Number of ISOs Weighted Average Exercise Price Weighted Average Grant Date Fair Value Outstanding at December 31, 2014 215,137 $ 17.35 $ 10.62 ISOs granted — $ — $ — ISOs exercised — $ — $ — ISOs forfeited (3,334 ) $ 16.31 $ 9.96 ISOs expired (833 ) $ 18.00 $ 11.03 Outstanding at December 31, 2015 210,970 $ 17.43 $ 10.67 ISOs exercisable at December 31, 2015 115,472 $ 17.61 $ 10.78 ISOs expected to vest at December 31, 2015 90,898 $ 17.09 $ 10.45
Summary of Activity for Restricted Stock Awards	The activity for restricted stock awards was as follows: Shares of Restricted Stock Weighted Average Grant Date Fair Value Outstanding at December 31, 2012 — $ — Restricted shares granted 20,000 $ 23.26 Restricted shares vested — $ — Restricted shares forfeited — $ — Outstanding at December 31, 2013 20,000 $ 23.26 Restricted shares expected to vest at December 31, 2013 20,000 $ 23.26 Shares of Restricted Stock Weighted Average Grant Date Fair Value Outstanding at December 31, 2013 20,000 $ 23.26 Restricted shares granted 67,500 $ 22.69 Restricted shares vested (6,666 ) $ 23.26 Restricted shares forfeited — $ — Outstanding at December 31, 2014 80,834 $ 22.78 Restricted shares expected to vest at December 31, 2014 80,834 $ 22.78 Shares of Restricted Stock Weighted Average Grant Date Fair Value Outstanding at December 31, 2014 80,834 $ 22.78 Restricted shares granted 26,000 $ 13.23 Restricted shares vested (29,164 ) $ 22.82 Restricted shares forfeited — $ — Outstanding at December 31, 2015 77,670 $ 19.57 Restricted shares expected to vest at December 31, 2015 77,670 $ 19.57 Restricted shares vesting during 2015 and 2014 had a fair value of approximately $356 and $282, respectively. There was no restricted share vesting during 2013.

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Schedule of Loss Before Tax	The components of loss before taxes were as follows: 2015 2014 2013 United States $ (13,138 ) $ (15,683 ) $ (9,675 ) Foreign (12,900 ) (6,001 ) 3,728 Loss before income taxes $ (26,038 ) $ (21,684 ) $ (5,947 )
Summary of Income Tax (Benefit) Expense	The (benefit) provision for income taxes consisted of the following: 2015 2014 2013 Current Deferred Total Current Deferred Total Current Deferred Total United States $ — $ (20 ) $ (20 ) $ — $ 20 $ 20 $ — $ — $ — Foreign 95 (248 ) (153 ) 290 (151 ) 139 370 — 370 (Benefit) provision for income taxes $ 95 $ (268 ) $ (173 ) $ 290 $ (131 ) $ 159 $ 370 $ — $ 370
Reconciliation of the (Benefit) Provision for Income Taxes	A reconciliation of the (benefit) provision for income taxes at the United States statutory rate of 34.0% to the effective rate of the Company for the years ended December 31 is as follows: 2015 2014 2013 United States statutory rate (34.0%) $ (8,853 ) $ (7,373 ) $ (2,022 ) (Loss) income of foreign disregarded entity (2,746 ) (212 ) 87 Taxes on foreign operations 648 119 3 Increase in uncertain tax positions — 210 323 Goodwill impairment 1,031 — — Net change in valuation allowances 9,173 6,980 2,029 Permanent differences and other 574 435 (50 ) (Benefit) provision for income taxes $ (173 ) $ 159 $ 370 Effective tax rate 0.7 % (0.7 )% (6.2 )%
Components of Deferred Income Tax Assets and Liabilities	The components of deferred income tax assets and liabilities consist of the following at December 31: 2015 2014 Deferred tax assets Accounts receivable $ 655 $ 836 Inventories 796 300 Property and equipment — 403 Accrued expenses and other current liabilities 699 849 Net operating loss carryforwards 17,475 7,375 Tax credit carryforwards 779 765 Other 1,447 1,012 Valuation allowance (20,089 ) (11,069 ) Total deferred tax assets 1,762 471 Deferred tax liabilities Property and equipment (943 ) — Other (847 ) (794 ) Total deferred tax liabilities (1,790 ) (794 ) Net deferred tax liabilities* $ (28 ) $ (323 ) * At December 31, 2015 and 2014, net deferred tax liabilities were reflected in other noncurrent liabilities in the consolidated balance sheet.
Summary of Changes to Valuation Allowances	The following table summarizes changes to the Company’s valuation allowances for the years ended December 31: 2015 2014 Beginning balance $ 11,069 $ 5,172 Increase to allowances 9,173 6,980 Foreign currency translation and other adjustments (153 ) (1,083 ) Ending balance $ 20,089 $ 11,069
Reconciliation of Unrecognized Tax Benefits	A reconciliation of the beginning and ending amount of unrecognized tax benefits at December 31 was as follows: 2015 2014 2013 Beginning balance $ 871 $ 768 $ 416 Increases related to current year tax positions — 210 323 Foreign currency translation adjustments (90 ) (107 ) 29 Ending balance $ 781 $ 871 $ 768
Summary of Tax Years Subject to Examinations	The following table summarizes tax years remaining subject to examination for each of the Company’s subsidiaries at December 31, 2015: Jurisdiction Tax Years Remaining Subject to Examination United States 2013-2015 Germany* 2010-2015 Italy 2014-2015 Sweden 2015 Japan 2010-2015 * At December 31, 2015, our ExOne GmbH (2010-2013) and ExOne Property GmbH (2013) subsidiaries were under examination by local taxing authorities.

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	12 Months Ended
	Dec. 31, 2015
Fair Value Disclosures [Abstract]
Fair Value of Liabilities Measured on Recurring Basis	The following table sets forth the fair value of the Company’s liabilities measured on a recurring basis by level at December 31: Level 2015 2014 Contingent consideration* 3 $ — $ 190 * Contingent consideration is included in accrued expenses and other current liabilities in the accompanying consolidated balance sheet.
Minimum Achievement of Revenues and Gross Profit	Terms of the earn-out provision require minimum achievement of revenues and gross profit for the year ended December 31 as follows: 2015 2014* Revenue $ 3,500 $ 2,490 Gross profit $ 875 $ 623 * For 2014, targets are representative of revenues and gross profit for the period from the date of acquisition (March 3, 2014) through December 31, 2014.
Summary of Changes in Fair Value of Company's Level 3 Financial Instruments	The following table sets forth a summary of changes in the fair value of the Company’s Level 3 financial instruments: Year Ended December 31, 2015 2014 Beginning balance $ 190 $ — Purchases — — Sales — — Issuances — 375 Settlements — — Realized (gains) losses (193 ) (195 ) Unrealized (gains) losses 3 10 Transfers into Level 3 — — Transfers out of Level 3 — — Ending balance $ — $ 190
Carrying Values and Fair Values of Other Financial Instruments	The carrying values and fair values of other financial instruments (assets and liabilities) not required to be recorded at fair value were as follows: December 31, December 31, 2015 2014 Carrying Value Fair Value Carrying Value Fair Value Cash and cash equivalents $ 19,342 $ 19,342 $ 36,202 $ 36,202 Current portion of long-term debt $ 138 $ 138 $ 132 $ 132 Current portion of capital and financing leases $ 82 $ 82 $ 346 $ 346 Long-term debt - net of current portion $ 1,812 $ 1,800 $ 1,950 $ 2,022 Capital and financing leases - net of current portion $ 81 $ 81 $ 164 $ 164

Segment, Product and Geograph43

Segment, Product and Geographic Information (Tables)	12 Months Ended
	Dec. 31, 2015
Segment Reporting [Abstract]
Revenue by Product	Revenue by product for the year ended December 31 was as follows: 2015 2014 2013 3D printing machines $ 15,464 $ 22,792 $ 24,851 3D printed and other products, materials and services 24,889 21,108 14,629 $ 40,353 $ 43,900 $ 39,480
Geographic Information for Revenue	Geographic information for revenue for the year ended December 31 was as follows (based on the country where the sale originated): 2015 2014 2013 United States $ 19,817 $ 21,115 $ 14,596 Germany 14,174 18,118 14,744 Japan 5,613 4,623 10,140 Italy 684 44 — Sweden 65 — — $ 40,353 $ 43,900 $ 39,480
Geographic Information for Long-Lived Assets	Geographic information for long-lived assets at December 31 was as follows (based on the physical location of assets): 2015 2014 United States $ 20,984 $ 20,334 Germany 27,417 28,522 Japan 5,210 4,978 Italy 1,213 1,464 Sweden 8 — $ 54,832 $ 55,298

Supplemental Quarterly Financ44

Supplemental Quarterly Financial Information (Tables)	12 Months Ended
	Dec. 31, 2015
Quarterly Financial Information Disclosure [Abstract]
Schedule of Supplemental Quarterly Financial Information	For the Quarter Ended December 31, 2015 September 30, 2015 June 30, 2015 March 31, 2015 Revenue - third party $ 16,057 $ 8,712 $ 7,358 $ 6,791 Revenue - related party 141 152 1,140 2 Total $ 16,198 $ 8,864 $ 8,498 $ 6,793 Gross profit $ 6,069 $ 1,169 $ 1,105 $ — Net loss attributable to ExOne $ (1,219 ) $ (10,077 ) $ (6,898 ) $ (7,671 ) Net loss attributable to ExOne per common share*: Basic $ (0.08 ) $ (0.70 ) $ (0.48 ) $ (0.53 ) Diluted $ (0.08 ) $ (0.70 ) $ (0.48 ) $ (0.53 ) For the Quarter Ended December 31, 2014 September 30, 2014 June 30, 2014 March 31, 2014 Revenue - third party $ 14,926 $ 9,640 $ 11,200 $ 7,263 Revenue - related party 839 9 1 22 Total $ 15,765 $ 9,649 $ 11,201 $ 7,285 Gross profit $ 3,855 $ 2,487 $ 2,496 $ 1,619 Net loss attributable to ExOne $ (7,200 ) $ (4,451 ) $ (4,665 ) $ (5,527 ) Net loss attributable to ExOne per common share*: Basic $ (0.50 ) $ (0.31 ) $ (0.32 ) $ (0.38 ) Diluted $ (0.50 ) $ (0.31 ) $ (0.32 ) $ (0.38 ) * Per-share amounts are calculated independently for each quarter presented; therefore the sum of the quarterly per-share amounts may not equal the per-share amounts for the year.

Summary of Significant Accoun45

Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($)	Sep. 13, 2013	Sep. 09, 2013	Feb. 12, 2013	Feb. 06, 2013	Dec. 31, 2014	Sep. 30, 2015	Sep. 30, 2013	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
State of incorporation								Delaware
Date of incorporation								Jan. 1, 2013
Net proceeds of initial public offering								$ 0	$ 0	$ 91,083,000
Net proceeds of secondary public offering							$ 157,311,000	0	0	64,948,000
Net income (loss)								(25,865,000)	(21,843,000)	(6,317,000)
Cash and cash equivalents					$ 36,202,000			$ 19,342,000	36,202,000	98,445,000	$ 2,802,000
Maturity of liquid instruments when purchased								three months or less
Allowance for doubtful accounts					2,431,000			$ 1,920,000	2,431,000
Provision for bad debts								(254,000)	2,391,000	152,000
Impairment losses								0	0	0
Goodwill impairment						$ 4,419,000		$ 4,419,000	0	0
Standard product warranty period								Substantially all of the Company’s 3D printing machines are covered by a standard twelve month warranty. At the time of sale, a liability is recorded (with an offset to cost of sales in the statement of operations and comprehensive loss) based upon the expected cost of replacement parts and labor to be incurred over the life of the standard warranty.
Product warranty reserves					1,543,000			$ 1,308,000	1,543,000
Tax benefits recognized upon settlement								50.00%
Advertising costs								$ 0	0	0
Percentage of contributions matched								50.00%
Percentage of matching contributions								8.00%
Contributions made to defined contribution savings plan								$ 365,000	269,000	$ 92,000
Decrease in accrued expenses and other current liabilities					(306,000)
Decrease in other noncurrent assets					(303,000)
Increase in other noncurrent liabilities					3,000
Prepaid Expenses and Other Current Assets [Member]
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Restricted cash					$ 0			$ 330,000	$ 0
Minimum [Member]
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Term till payment is required from date of shipment								30 days
Estimated useful lives								3 years
Maximum [Member]
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Term till payment is required from date of shipment								60 days
Estimated useful lives								40 years
Geographic Concentration Risk [Member] | Sales Revenue, Net [Member] | Outside of United States [Member]
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Percentage of revenue derived outside the United States								50.90%	51.90%	63.00%
IPO [Member]
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Common stock, new issuances				6,095,000
Common stock price per share				$ 18
Common stock, new shares sold by Company				5,483,333
Common stock, new shares sold by stockholder				611,667
Net proceeds of initial public offering			$ 91,996,000
Secondary Public Offering [Member]
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Common stock, new issuances		3,054,400
Common stock price per share		$ 62
Common stock, new shares sold by Company		1,106,000
Common stock, new shares sold by stockholder		1,948,400
Net proceeds of secondary public offering	$ 65,315,000

Accumulated Other Comprehensi46

Accumulated Other Comprehensive Loss - Summary of Changes in the Components of Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Statement Of Income And Comprehensive Income [Abstract]
Balance at beginning of period	$ (8,203)	$ (352)	$ (174)
Other comprehensive loss	(5,332)	(7,851)	(178)
Balance at end of period	$ (13,535)	$ (8,203)	$ (352)

Accumulated Other Comprehensi47

Accumulated Other Comprehensive Loss - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Statement Of Income And Comprehensive Income [Abstract]
Accumulated other comprehensive loss, tax	$ 0	$ 0	$ 0
Amounts reclassified to earnings from accumulated other comprehensive loss	$ 0	$ 0	$ 0

Loss Per Share - Additional Inf

Loss Per Share - Additional Information (Detail) - shares	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Incentive Stock Option [Member]
Net Income Loss Per Common Share [Line Items]
Potential shares of anti-dilutive common stock	210,970	215,137	173,333
Restricted Stock Units (RSUs) [Member]
Net Income Loss Per Common Share [Line Items]
Potential shares of anti-dilutive common stock	77,670	80,834	20,000

Loss Per Share - Computation of

Loss Per Share - Computation of Basic and Diluted Net Loss Attributable to Exone Per Common Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended																12 Months Ended
	Dec. 31, 2015		Sep. 30, 2015		Jun. 30, 2015		Mar. 31, 2015		Dec. 31, 2014		Sep. 30, 2014		Jun. 30, 2014		Mar. 31, 2014		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Earnings Per Share [Abstract]
Net loss attributable to ExOne	$ (1,219)		$ (10,077)		$ (6,898)		$ (7,671)		$ (7,200)		$ (4,451)		$ (4,665)		$ (5,527)		$ (25,865)	$ (21,843)	$ (6,455)
Less: Preferred stock dividends declared																			(152)
Net loss available to ExOne common shareholders																	$ (25,865)	$ (21,843)	$ (6,607)
Weighted average shares outstanding (basic and diluted)																	14,427,956	14,411,054	12,838,230
Net loss attributable to ExOne per common share:
Basic	$ (0.08)	[1]	$ (0.70)	[1]	$ (0.48)	[1]	$ (0.53)	[1]	$ (0.50)	[1]	$ (0.31)	[1]	$ (0.32)	[1]	$ (0.38)	[1]	$ (1.79)	$ (1.52)	$ (0.51)
Diluted	$ (0.08)	[1]	$ (0.70)	[1]	$ (0.48)	[1]	$ (0.53)	[1]	$ (0.50)	[1]	$ (0.31)	[1]	$ (0.32)	[1]	$ (0.38)	[1]	$ (1.79)	$ (1.52)	$ (0.51)
[1]	Per-share amounts are calculated independently for each quarter presented; therefore the sum of the quarterly per-share amounts may not equal the per-share amounts for the year.

Acquisitions - Additional Infor

Acquisitions - Additional Information (Detail) € in Thousands	Mar. 06, 2014USD ($)	Mar. 03, 2014USD ($)	Mar. 27, 2013USD ($)	Dec. 31, 2015USD ($)	Dec. 31, 2014USD ($)	Dec. 31, 2013USD ($)	Mar. 06, 2014EUR (€)
Business Acquisition [Line Items]
Goodwill				$ 0	$ 4,665,000
Payments to acquire assets, including property and equipment				4,938,000	23,081,000	$ 19,311,000
Reduction to equity through noncontrolling interest						$ 2,724,000
MAM Corporation [Member]
Business Acquisition [Line Items]
Total purchase price		$ 4,917,000
Purchase price in cash		4,542,000
Purchase price in contingent consideration		$ 375,000
Number of year for earn out provision		2 years
Goodwill		$ 1,407,000
Goodwill deductible for income tax purpose		1,083,000
Assignment of goodwill				0
Gain or loss on extinguishment of debt				0
Acquisition-related expenses		88,000			76,000
Property plant and equipment, Carrying value		$ 2,998,000
MWT Corporation [Member]
Business Acquisition [Line Items]
Total purchase price	$ 4,814,000						€ 3,500
Goodwill	3,685,000
Assignment of goodwill				$ 0
Acquisition-related expenses	143,000				$ 138,000
Property plant and equipment, Carrying value	$ 21,000
Troy Metal Fabricating, LLC [Member]
Business Acquisition [Line Items]
Payments to acquire assets, including property and equipment			$ 1,900,000
Lone Star Metal Fabrication, LLC [ Member]
Business Acquisition [Line Items]
Payments to acquire assets, including property and equipment			200,000
Troy Metal Fabricating LLC and Lone Star Metal Fabrication LLC [Member]
Business Acquisition [Line Items]
Goodwill			0
Return of capital			1,400,000
Property plant and equipment, Carrying value			5,400,000
Repayment of outstanding debt			4,700,000
Reduction to equity through noncontrolling interest			$ 2,724,000

Acquisitions - Final Allocation

Acquisitions - Final Allocation of Purchase Price (Detail) € in Thousands, $ in Thousands	Dec. 31, 2015USD ($)	Dec. 31, 2014USD ($)	Mar. 06, 2014USD ($)	Mar. 06, 2014EUR (€)	Mar. 03, 2014USD ($)
Business Acquisition [Line Items]
Goodwill	$ 0	$ 4,665
MAM Corporation [Member]
Business Acquisition [Line Items]
Accounts receivable					$ 209
Inventories					224
Prepaid expenses and other current assets					15
Property and equipment					2,998
Intangible assets					503
Goodwill					1,407
Total assets					5,356
Accounts payable					56
Accrued expenses and other current liabilities					45
Long-term debt					338
Total liabilities					439
Total purchase price					$ 4,917
MWT Corporation [Member]
Business Acquisition [Line Items]
Cash and cash equivalents			$ 201
Accounts receivable			118
Inventories			476
Prepaid expenses and other current assets			29
Property and equipment			21
Intangible assets			1,704
Goodwill			3,685
Total assets			6,234
Accounts payable			128
Accrued expenses and other current liabilities			605
Deferred revenue and customer prepayments			195
Deferred income taxes			492
Total liabilities			1,420
Total purchase price			$ 4,814	€ 3,500

Acquisitions - Schedule of Allo

Acquisitions - Schedule of Allocation of Purchase Price to Net Assets Acquired and Liabilities (Detail) - USD ($) $ in Thousands	Mar. 06, 2014	Mar. 03, 2014
MAM Corporation [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Fair value of intangible assets acquired		$ 503
MAM Corporation [Member] | Customer Relationships [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Fair value of intangible assets acquired		$ 464
Economic Life		7 years
MAM Corporation [Member] | Trade Names [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Fair value of intangible assets acquired		$ 24
Economic Life		5 years
MAM Corporation [Member] | Noncompetition Agreement [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Fair value of intangible assets acquired		$ 15
Economic Life		3 years
MWT Corporation [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Fair value of intangible assets acquired	$ 1,704
MWT Corporation [Member] | Trade Names [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Fair value of intangible assets acquired	$ 36
Economic Life	4 years
MWT Corporation [Member] | Unpatented Technology [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Fair value of intangible assets acquired	$ 1,668
Economic Life	4 years

Acquisitions - Final Allocati53

Acquisitions - Final Allocation of Purchase Price (Parenthetical) (Detail) - MWT Corporation [Member] $ in Thousands	Mar. 06, 2014USD ($)
Business Acquisition [Line Items]
Accounts receivable	$ 117
Deferred revenue and customer prepayments	$ 195

Inventories - Schedule of Inven

Inventories - Schedule of Inventories (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Inventory Disclosure [Abstract]
Raw materials and components	$ 9,467	$ 10,838
Work in process	6,048	4,221
Finished goods	4,324	1,955
Inventories	$ 19,839	$ 17,014

Inventories - Additional Inform

Inventories - Additional Information (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Inventory [Line Items]
Allowance for slow-moving and obsolete inventories	$ 1,909	$ 1,241
Laser Micromachining Product [Member]
Inventory [Line Items]
Allowance for slow-moving and obsolete inventories	$ 507	$ 419

Property and Equipment - Summar

Property and Equipment - Summary of Property and Equipment (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Property, Plant and Equipment [Line Items]
Total gross property and equipment before accumulated depreciation	$ 65,397	$ 57,630
Less: Accumulated depreciation	(11,017)	(7,213)
Property and equipment, excluding construction-in-progress	54,380	50,417
Construction-in-progress	452	4,881
Property and equipment - net	$ 54,832	55,298
Minimum [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, Economic Life	3 years
Maximum [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, Economic Life	40 years
Land [Member]
Property, Plant and Equipment [Line Items]
Total gross property and equipment before accumulated depreciation	$ 6,969	7,154
Building and Related Improvements [Member]
Property, Plant and Equipment [Line Items]
Total gross property and equipment before accumulated depreciation	$ 28,498	27,031
Building and Related Improvements [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, Economic Life	5 years
Building and Related Improvements [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, Economic Life	40 years
Machinery and Equipment [Member]
Property, Plant and Equipment [Line Items]
Total gross property and equipment before accumulated depreciation	$ 23,935	18,510
Machinery and Equipment [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, Economic Life	3 years
Machinery and Equipment [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, Economic Life	20 years
Other [Member]
Property, Plant and Equipment [Line Items]
Total gross property and equipment before accumulated depreciation	$ 5,995	$ 4,935
Other [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, Economic Life	3 years
Other [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, Economic Life	20 years

Property and Equipment - Additi

Property and Equipment - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Property, Plant and Equipment [Line Items]
Depreciation	$ 4,809	$ 4,139	$ 2,372
Machinery and Equipment [Member]
Property, Plant and Equipment [Line Items]
Machinery and equipment	364	1,057
Machinery and equipment	2,267	1,371
Carrying value of assets	$ 1,816	$ 844

Property and Equipment - Schedu

Property and Equipment - Schedule of Minimum Future Rentals of Machinery and Equipment Under Non-cancellable Arrangements (Detail) - Machinery and Equipment [Member] $ in Thousands	Dec. 31, 2015USD ($)
Property, Plant and Equipment [Line Items]
2,016	$ 859
2,017	439
2,018	118
2,019	0
2,020	0
Thereafter	0
Minimum future rentals of machinery and equipment, total	$ 1,416

Impairment - Additional Informa

Impairment - Additional Information (Detail) - USD ($)	3 Months Ended		12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Asset Impairment Charges [Abstract]
Long-lived assets held for use impairment loss	$ 0	$ 0
Goodwill impairment		$ 4,419,000	$ 4,419,000	$ 0	$ 0

Impairment - Schedule of Change

Impairment - Schedule of Changes in Carrying Amount of Goodwill (Detail) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Sep. 30, 2015	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Goodwill And Intangible Assets Disclosure [Abstract]
Goodwill beginning balance		$ 4,665
Acquisition of businesses			$ 5,092
Foreign currency translation adjustments		(246)	(427)
Impairment	$ (4,419)	(4,419)	0	$ 0
Goodwill ending balance		$ 0	$ 4,665

Intangible Assets - Schedule of

Intangible Assets - Schedule of Intangible Assets (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 1,855	$ 2,009
Accumulated Amortization	(759)	(377)
Finite lived intangible asset net	1,096	1,632
Unpatented Technology [Member]
Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	1,323	1,474
Accumulated Amortization	(606)	(307)
Finite lived intangible asset net	717	1,167
Customer Relationships [Member]
Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	464	464
Accumulated Amortization	(122)	(55)
Finite lived intangible asset net	342	409
Trade Names [Member]
Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	53	56
Accumulated Amortization	(22)	(11)
Finite lived intangible asset net	31	45
Noncompete Agreements [Member]
Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	15	15
Accumulated Amortization	(9)	(4)
Finite lived intangible asset net	$ 6	$ 11

Intangible Assets - Additional

Intangible Assets - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Intangible Liability Disclosure [Abstract]
Intangible assets			$ 0
Amortization of intangible assets	$ 418,000	$ 381,000

Intangible Assets - Future Esti

Intangible Assets - Future Estimated Amortization Expense Related to the Intangible assets (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Finite Lived Intangible Assets Net [Abstract]
2,016	$ 415
2,017	410
2,018	127
2,019	67
2,020	66
Thereafter	11
Finite lived intangible asset net	$ 1,096	$ 1,632

Related Party Revolving Credi64

Related Party Revolving Credit Facility - Additional Information (Detail)	Jan. 13, 2016USD ($)	Sep. 30, 2015USD ($)	Mar. 31, 2016USD ($)	Dec. 31, 2015USD ($)	Dec. 31, 2014USD ($)	Dec. 31, 2014EUR (€)	Oct. 23, 2015USD ($)	Sep. 30, 2015EUR (€)
Line Of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity		$ 1,400,000						€ 1,300,000
Interest expense relating to the commitment fee		$ 0			$ 0	€ 0
Revolving Credit Facility [Member] | RHI Investments, LLC [Member]
Line Of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity							$ 15,000,000
Deferred financing costs							$ 215,000
Credit facility, outstanding amount				$ 0
Interest expense relating to the Credit Agreement				39,000
Interest expense relating to the commitment fee				$ 28,000
Commitment fee				1.00%
Amortization of deferred financing costs				$ 11,000
Revolving Credit Facility [Member] | RHI Investments, LLC [Member] | Subsequent Event [Member]
Line Of Credit Facility [Line Items]
Credit facility, outstanding amount	$ 0
Interest expense relating to the commitment fee	$ 5,000
Amortization of deferred financing costs			$ 204,000
Revolving Credit Facility [Member] | RHI Investments, LLC [Member] | Prepaid Expenses and Other Current Assets [Member]
Line Of Credit Facility [Line Items]
Deferred financing costs, net				$ 204,000

Long-Term Debt - Components of

Long-Term Debt - Components of Long-Term Debt (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Building Note Payable To United States Bank [Member]
Debt Instrument [Line Items]
Note payable to a bank	$ 1,950	$ 2,082

Long-Term Debt - Additional Inf

Long-Term Debt - Additional Information (Detail)	1 Months Ended	12 Months Ended
	Sep. 30, 2015USD ($)	Dec. 31, 2015USD ($)	Dec. 31, 2014USD ($)	Dec. 31, 2014EUR (€)	Dec. 31, 2015EUR (€)	Sep. 30, 2015EUR (€)	Dec. 31, 2014EUR (€)
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	$ 1,400,000					€ 1,300,000
Interest expense relating to the commitment fee	0		$ 0	€ 0
Line of credit facility, covenant compliance		The line of credit agreement contained a negative covenant of an annual equity capital ratio for ExOne GmbH of no less than 50%.
Line of credit facility, minimum incremental borrowing capacity	$ 110,000					€ 100,000
Line of Credit [Member]
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity			600,000				€ 500,000
Credit facility, outstanding amount		$ 0	0
Line of Credit [Member] | Minimum [Member]
Debt Instrument [Line Items]
Debt Instrument, term	30 days
Security Agreement [Member]
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity			1,000,000				800,000
Credit facility, outstanding amount		685,000			€ 628,000
Interest rate	1.75%
Overdraft Credit [Member]
Debt Instrument [Line Items]
Interest rate	10.20%
Compensating Cash Balance [Member] | Security Agreement [Member]
Debt Instrument [Line Items]
Credit facility, outstanding amount			$ 1,442,000				€ 1,186,000
Building Note Payable To United States Bank [Member]
Debt Instrument [Line Items]
Notes payable monthly payments		$ 18,000
Building note payable to a bank, with monthly payments interest rate		4.00%			4.00%
Building note payable to a bank, with monthly payments basis spread		3.25%
Date of interest rate adjustment		2017-05
Notes payable maturity		2027-05

Long-Term Debt - Future Maturit

Long-Term Debt - Future Maturities of Long-Term Debt (Detail) $ in Thousands	Dec. 31, 2015USD ($)
Debt Disclosure [Abstract]
2,016	$ 138
2,017	139
2,018	142
2,019	150
2,020	158
Thereafter	1,223
Long-term debt	$ 1,950

Leases - Additional Information

Leases - Additional Information (Detail) € in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2015USD ($)	Dec. 31, 2015EUR (€)	Dec. 31, 2014USD ($)	Dec. 31, 2013USD ($)
Sale Leaseback Transaction [Line Items]
Rent expense under operating lease	$ 421		$ 982	$ 1,072
March 2012 [Member]
Sale Leaseback Transaction [Line Items]
Proceeds from sale-leaseback transaction	$ 985	€ 739
Lease repayment period	3 years	3 years
Repayment start date	2012-04	2012-04
Gain (loss) recognized on the repurchase of 3D printing machine	$ 20	€ 18
November 2012 [Member]
Sale Leaseback Transaction [Line Items]
Proceeds from sale-leaseback transaction	$ 974	€ 737
Lease repayment period	3 years	3 years
Repayment start date	2013-01	2013-01
Gain (loss) recognized on the repurchase of 3D printing machine	$ (21)	€ (19)

Leases - Future Maturities of C

Leases - Future Maturities of Capital Leases (Detail) $ in Thousands	Dec. 31, 2015USD ($)
Leases [Abstract]
2,016	$ 82
2,017	72
2,018	7
2,019	2
2,020	0
Thereafter	0
Future maturities of capital leases, total	$ 163

Leases - Future Minimum Lease P

Leases - Future Minimum Lease Payments of Operating Lease Arrangements (Detail) $ in Thousands	Dec. 31, 2015USD ($)
Leases [Abstract]
2,016	$ 340
2,017	259
2,018	185
2,019	41
2,020	18
Thereafter	0
Future minimum lease payments of operating lease, Total	$ 843

Accrued Expenses and Other Cu71

Accrued Expenses and Other Current Liabilities - Schedule of Accrued Expenses and Other Current Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Payables And Accruals [Abstract]
Accrued payroll and related costs	$ 1,816	$ 2,087
Product warranty reserves	1,308	1,543
Accrued sales commissions	588	951
Liability for uncertain tax positions	781	871	$ 768	$ 416
Accrued professional fees	203	405
Accrued license fees	534	392
Other	1,180	1,869
Accrued expenses and other current liabilities	$ 6,410	$ 8,118

Equity-Based Compensation - Add

Equity-Based Compensation - Additional Information (Detail) - USD ($)	Jan. 24, 2013	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average remaining vesting period		1 year 7 months 6 days
ISOs issued by the company		0	62,000	180,000
Proceeds from exercise of employee stock options		$ 0	$ 333,000	$ 0
Common stock issued related to employee stock option exercises		0	18,529	0
Incentive Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total future compensation expense		$ 436,000
Intrinsic value, ISOs exercisable		$ 0
Weighted average remaining contractual term, exercisable		7 years 4 months 24 days
Weighted average remaining contractual term, expected to vest		7 years 10 months 24 days
Intrinsic value of ISOs exercised by employee			$ 312,000
Proceeds from exercise of employee stock options			333,000
Income tax benefit			$ 0
Common stock issued related to employee stock option exercises		0		0
Incentive Stock Option [Member] | Share Based Compensation Award Tranche One [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock awards vesting percentage on the anniversary of the date of grant		33.33%
Incentive Stock Option [Member] | Share Based Compensation Award Tranche Two [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock awards vesting percentage on the anniversary of the date of grant		33.33%
Incentive Stock Option [Member] | Share Based Compensation Award Tranche Three [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock awards vesting percentage on the anniversary of the date of grant		33.33%
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total future compensation expense		$ 916,000
Restricted Stock [Member] | Share Based Compensation Award Tranche One [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock awards vesting percentage on the anniversary of the date of grant		33.33%
Restricted Stock [Member] | Share Based Compensation Award Tranche Two [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock awards vesting percentage on the anniversary of the date of grant		33.33%
Restricted Stock [Member] | Share Based Compensation Award Tranche Three [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock awards vesting percentage on the anniversary of the date of grant		33.33%
2013 Equity Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock reserved for issuance	500,000
Common Stock [Member] | 2013 Equity Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of outstanding shares of common stock	3.00%
Common Stock [Member] | 2013 Equity Incentive Plan [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Shares authorized	1,992,241

Equity-Based Compensation - Sum

Equity-Based Compensation - Summary of Total Equity-Based Compensation Expense Recognized for All ISOs, Restricted Stock and Stock Bonus Awards (Detail) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Equity-based compensation expense recognized:
Total equity-based compensation expense before income taxes		$ 1,725	$ 1,206	$ 711
Benefit for income taxes	[1]	0	0	0
Total equity-based compensation expense net of income taxes		1,725	1,206	711
Incentive Stock Option [Member]
Equity-based compensation expense recognized:
Total equity-based compensation expense before income taxes		807	633	580
Restricted Stock [Member]
Equity-based compensation expense recognized:
Total equity-based compensation expense before income taxes		918	376	131
Stock Bonus Awards [Member]
Equity-based compensation expense recognized:
Total equity-based compensation expense before income taxes		$ 0	$ 197	$ 0
[1]	The benefit for income taxes from equity-based compensation for each of the periods presented has been determined to be $0 based on valuation allowances against net deferred tax assets.

Equity-Based Compensation - S74

Equity-Based Compensation - Summary of Total Equity-Based Compensation Expense Recognized for All ISOs, Restricted Stock and Stock Bonus Awards (Parenthetical) (Detail) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Benefit for income taxes from equity-based compensation	[1]	$ 0	$ 0	$ 0
[1]	The benefit for income taxes from equity-based compensation for each of the periods presented has been determined to be $0 based on valuation allowances against net deferred tax assets.

Equity-Based Compensation - Ass

Equity-Based Compensation - Assumptions for Fair Value of ISOs Estimated on the Date of Grant Using the Black-Scholes Option (Detail) - $ / shares	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2015
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Weighted average fair value per ISO	$ 11.03		$ 9.60
Volatility	67.00%	68.70%
Average risk-free interest rate	1.76%	1.07%
Dividend yield	0.00%	0.00%
Expected term (years)	6 years	6 years

Equity-Based Compensation - S76

Equity-Based Compensation - Summary of Activity for ISOs (Detail) - $ / shares	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Number of ISOs, outstanding, Beginning Balance	215,137	173,333	0
Number of ISOs, granted	0	62,000	180,000
Number of ISOs, exercised	0	(18,529)	0
Number of ISOs, forfeited	(3,334)	(1,667)	(6,667)
Number of ISOs, expired	(833)	0	0
Number of ISOs, outstanding, Ending Balance	210,970	215,137	173,333
Number of ISOs, exercisable	115,472	39,804	0
Number of ISOs, expected to vest, net of forfeitures	90,898	166,638	164,852
Weighted Average Exercise Price, Beginning Balance	$ 17.35	$ 18	$ 0
Weighted Average Exercise Price, ISOs granted	0	15.74	18
Weighted Average Exercise Price, ISOs exercised	0	18	0
Weighted Average Exercise Price, ISOs forfeited	16.31	18	18
Weighted Average Exercise Price, ISOs expired	18	0	0
Weighted Average Exercise Price, Ending Balance	17.43	17.35	18
Weighted Average Exercise Price, ISOs exercisable	17.61	18	0
Weighted Average Exercise Price, ISOs expected to vest, net of forfeitures	17.09	17.21	18
Weighted Average Grant Date Fair Value, Beginning Balance	10.62	11.03	0
Weighted Average Grant Date Fair Value, ISOs granted	0	9.60	11.03
Weighted Average Grant Date Fair Value, ISOs exercised	0	11.03	0
Weighted Average Grant Date Fair Value, ISOs forfeited	9.96	11.03	11.03
Weighted Average Grant Date Fair Value, ISOs expired	11.03	0	0
Weighted Average Grant Date Fair Value, Ending Balance	10.67	10.62	11.03
Weighted Average Grant Date Fair Value, ISOs exercisable	10.78	11.03	0
Weighted Average Grant Date Fair Value, ISOs expected to vest, net of forfeitures	$ 10.45	$ 10.53	$ 11.03

Equity-Based Compensation - S77

Equity-Based Compensation - Summary of Activity for Restricted Stock Awards (Detail) - Restricted Stock [Member] - $ / shares	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Restricted Shares, outstanding, Beginning Balance	80,834	20,000
Number of Restricted Shares, granted	26,000	67,500	20,000
Number of Restricted Shares, vested	(29,164)	(6,666)
Number of Restricted Shares, forfeited	0	0	0
Number of Restricted Shares, outstanding, Ending Balance	77,670	80,834	20,000
Number of Restricted Shares, expected to vest	77,670	80,834	20,000
Weighted Average Grant Date Fair Value, Beginning Balance	$ 22.78	$ 23.26
Weighted Average Grant Date Fair Value, granted	13.23	22.69	$ 23.26
Weighted Average Grant Date Fair Value, vested	22.82	23.26
Weighted Average Grant Date Fair Value, Ending Balance	19.57	22.78	23.26
Weighted Average Grant Date Fair Value, expected to vest	$ 19.57	$ 22.78	$ 23.26

Equity-Based Compensation - S78

Equity-Based Compensation - Summary of Activity for Restricted Stock Awards (Parenthetical) (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of restricted shares vesting	$ 356,000	$ 282,000	$ 0

Income Taxes - Additional Infor

Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Jan. 01, 2013	Dec. 31, 2012
Schedule Of Income Taxes [Line Items]
Deferred tax assets, net	$ 1,762	$ 471		$ 410
Percentage of valuation allowance of initial net deferred tax asset				100.00%
Net operating loss carryforwards	$ 116	$ 54
United States statutory rate	34.00%	34.00%	34.00%
Liability for uncertain tax positions	$ 781	$ 871	$ 768		$ 416
Subsidiaries [Member] | United States [Member]
Schedule Of Income Taxes [Line Items]
Net operating loss carryforwards	39,949
Subsidiaries [Member] | Japan [Member]
Schedule Of Income Taxes [Line Items]
Net operating loss carryforwards	2,769
Liability for uncertain tax positions	285	159
Subsidiaries [Member] | German, Italian and Swedish [Member]
Schedule Of Income Taxes [Line Items]
Net operating loss carryforwards	11,323
Subsidiaries [Member] | Germany [Member]
Schedule Of Income Taxes [Line Items]
Liability for uncertain tax positions	$ 195	$ 195
Subsidiaries [Member] | Earliest Tax Year [Member] | United States [Member]
Schedule Of Income Taxes [Line Items]
Expiration period of net operating loss carryforwards	2,033
Subsidiaries [Member] | Earliest Tax Year [Member] | Japan [Member]
Schedule Of Income Taxes [Line Items]
Expiration period of net operating loss carryforwards	2,016
Subsidiaries [Member] | Latest Tax Year [Member] | United States [Member]
Schedule Of Income Taxes [Line Items]
Expiration period of net operating loss carryforwards	2,035
Subsidiaries [Member] | Latest Tax Year [Member] | Japan [Member]
Schedule Of Income Taxes [Line Items]
Expiration period of net operating loss carryforwards	2,022
Subsidiaries [Member] | 2023 [Member] | United States [Member]
Schedule Of Income Taxes [Line Items]
Tax credit carryforwards	$ 765
Expiration period of tax credit carryforwards	2,023

Income Taxes - Schedule of Loss

Income Taxes - Schedule of Loss Before Tax (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
United States	$ (13,138)	$ (15,683)	$ (9,675)
Foreign	(12,900)	(6,001)	3,728
Loss before income taxes	$ (26,038)	$ (21,684)	$ (5,947)

Income Taxes - Summary of Incom

Income Taxes - Summary of Income Tax (Benefit) Expense (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Foreign	$ 95	$ 290	$ 370
(Benefit) provision for income taxes	95	290	370
United States	(20)	20
Foreign	(248)	(151)
(Benefit) provision for income taxes	(268)	(131)	0
United States	(20)	20
Foreign	(153)	139	370
(Benefit) provision for income taxes	$ (173)	$ 159	$ 370

Income Taxes - Reconciliation o

Income Taxes - Reconciliation of the (Benefit) Provision for Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
United States statutory rate (34.0%)	$ (8,853)	$ (7,373)	$ (2,022)
(Loss) income of foreign disregarded entity	(2,746)	(212)	87
Taxes on foreign operations	648	119	3
Increase in uncertain tax positions		210	323
Goodwill impairment	1,031
Net change in valuation allowances	9,173	6,980	2,029
Permanent differences and other	574	435	(50)
(Benefit) provision for income taxes	$ (173)	$ 159	$ 370
Effective tax rate	0.70%	(0.70%)	(6.20%)

Income Taxes - Reconciliation83

Income Taxes - Reconciliation of the (Benefit) Provision for Income Taxes (Parenthetical) (Detail)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
United States statutory rate	34.00%	34.00%	34.00%

Income Taxes - Components of De

Income Taxes - Components of Deferred Income Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Jan. 01, 2013
Deferred tax assets
Accounts receivable		$ 655	$ 836
Inventories		796	300
Property and equipment			403
Accrued expenses and other current liabilities		699	849
Net operating loss carryforwards		17,475	7,375
Tax credit carryforwards		779	765
Other		1,447	1,012
Valuation allowance		(20,089)	(11,069)	$ (5,172)
Total deferred tax assets		1,762	471		$ 410
Deferred tax liabilities
Property and equipment		(943)
Other		(847)	(794)
Total deferred tax liabilities		(1,790)	(794)
Net deferred tax liabilities	[1]	$ (28)	$ (323)
[1]	At December 31, 2015 and 2014, net deferred tax liabilities were reflected in other noncurrent liabilities in the consolidated balance sheet.

Income Taxes - Summary of Chang

Income Taxes - Summary of Changes to Valuation Allowances (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Beginning balance	$ 11,069	$ 5,172
Increase to allowances	9,173	6,980
Foreign currency translation and other adjustments	(153)	(1,083)
Ending balance	$ 20,089	$ 11,069

Income Taxes - Reconciliation86

Income Taxes - Reconciliation of Unrecognized Tax Benefits (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Beginning balance	$ 871	$ 768	$ 416
Increases related to current year tax positions		210	323
Foreign currency translation adjustments	(90)	(107)	29
Ending balance	$ 781	$ 871	$ 768

Income Taxes - Summary of Tax Y

Income Taxes - Summary of Tax Year Subject to Examinations (Detail)	12 Months Ended
	Dec. 31, 2015
United States [Member] | Earliest Tax Year [Member]
Income Tax Contingency [Line Items]
Tax year subject to examination	2,013
United States [Member] | Latest Tax Year [Member]
Income Tax Contingency [Line Items]
Tax year subject to examination	2,015
Germany [Member] | Earliest Tax Year [Member]
Income Tax Contingency [Line Items]
Tax year subject to examination	2,010
Germany [Member] | Latest Tax Year [Member]
Income Tax Contingency [Line Items]
Tax year subject to examination	2,015
Italy [Member] | Earliest Tax Year [Member]
Income Tax Contingency [Line Items]
Tax year subject to examination	2,014
Italy [Member] | Latest Tax Year [Member]
Income Tax Contingency [Line Items]
Tax year subject to examination	2,015
Sweden [Member]
Income Tax Contingency [Line Items]
Tax year subject to examination	2,015
Japan [Member] | Earliest Tax Year [Member]
Income Tax Contingency [Line Items]
Tax year subject to examination	2,010
Japan [Member] | Latest Tax Year [Member]
Income Tax Contingency [Line Items]
Tax year subject to examination	2,015

Fair Value Measurements - Fair

Fair Value Measurements - Fair Value of Liabilities Measured on Recurring Basis (Detail) - USD ($) $ in Thousands		Dec. 31, 2015	Dec. 31, 2014
Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Contingent consideration	[1]	$ 0	$ 190
[1]	Contingent consideration is included in accrued expenses and other current liabilities in the accompanying consolidated balance sheet.

Fair Value Measurements - Minim

Fair Value Measurements - Minimum Achievement of Revenues and Gross Profit (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014		Dec. 31, 2013
Schedule Of Earn Out Of Required Minimum Achievement Of Revenues And Gross Profit [Line Items]
Revenue	$ 16,198	$ 8,864	$ 8,498	$ 6,793	$ 15,765	$ 9,649	$ 11,201	$ 7,285	$ 40,353	$ 43,900		$ 39,480
Gross profit	$ 6,069	$ 1,169	$ 1,105		$ 3,855	$ 2,487	$ 2,496	$ 1,619	8,343	10,457		$ 15,573
Earn Out Provision [Member] | Minimum [Member]
Schedule Of Earn Out Of Required Minimum Achievement Of Revenues And Gross Profit [Line Items]
Revenue									3,500	2,490	[1]
Gross profit									$ 875	$ 623	[1]
[1]	For 2014, targets are representative of revenues and gross profit for the period from the date of acquisition (March 3, 2014) through December 31, 2014.

Fair Value Measurements - Min90

Fair Value Measurements - Minimum Achievement of Revenues and Gross Profit (Parenthetical) (Detail)	12 Months Ended
	Dec. 31, 2015
MAM Corporation [Member]
Schedule Of Earn Out Of Required Minimum Achievement Of Revenues And Gross Profit [Line Items]
Date of acquisition	Mar. 3, 2014

Fair Value Measurements - Addit

Fair Value Measurements - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Changes in fair value of contingent consideration	$ (193)	$ (185)	$ 0
MAM Corporation [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Changes in fair value of contingent consideration	$ (190)	$ (185)

Fair Value Measurements - Summa

Fair Value Measurements - Summary of Changes in Fair Value of Company's Level 3 Financial Instruments (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Fair Value Disclosures [Abstract]
Beginning balance	$ 190	$ 0
Purchases	0	0
Sales	0	0
Issuances	0	375
Settlements	0	0
Realized (gains) losses	(193)	(195)
Unrealized (gains) losses	3	10
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Ending balance	$ 0	$ 190

Fair Value Measurements - Carry

Fair Value Measurements - Carrying Values and Fair Values of Other Financial Instruments (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	$ 19,342	$ 36,202	$ 98,445	$ 2,802
Current portion of long-term debt	138	132
Current portion of capital and financing leases	82	346
Long-term debt - net of current portion	1,812	1,950
Capital and financing leases - net of current portion	81	164
Carrying Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	19,342	36,202
Current portion of long-term debt	138	132
Current portion of capital and financing leases	82	346
Long-term debt - net of current portion	1,812	1,950
Capital and financing leases - net of current portion	81	164
Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	19,342	36,202
Current portion of long-term debt	138	132
Current portion of capital and financing leases	82	346
Long-term debt - net of current portion	1,800	2,022
Capital and financing leases - net of current portion	$ 81	$ 164

Customer Concentrations - Addit

Customer Concentrations - Additional Information (Detail) - Five Most Significant Customers [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Revenue, Major Customer [Line Items]
Accounts receivable from significant customers	$ 4,808	$ 6,326
Customer Concentration Risk [Member] | Sales Revenue, Net [Member]
Revenue, Major Customer [Line Items]
Revenue concentration, by most significant customers	19.00%	23.10%	25.50%

Related Party Transactions - Ad

Related Party Transactions - Additional Information (Detail) - USD ($)	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Related Party Transaction [Line Items]
Revenue - related party	$ 141,000	$ 152,000	$ 1,140,000	$ 2,000	$ 839,000	$ 9,000	$ 1,000	$ 22,000	$ 1,435,000	$ 871,000	$ 0
Amounts due from related parties reflected in accounts receivable	31,000				30,000				31,000	30,000
Payments for services received from related parties									27,000	90,000	185,000
Amounts due to related party	15,000				29,000				15,000	29,000
Fair market value of benefits received from related party									38,000	34,000	0
Accounts Payable and Accrued Liabilities [Member]
Related Party Transaction [Line Items]
Amounts due to related party	1,000				1,000				1,000	1,000
Accrued Expenses and Other Current Liabilities [Member]
Related Party Transaction [Line Items]
Amounts due to related party	14,000				28,000				14,000	28,000
Chairman And Chief Executive Officer [Member]
Related Party Transaction [Line Items]
Reimbursement of costs from related party											133,000
3D Printing Machines [Member] | December 2014 Sale Agreement [Member] | Chairman And Chief Executive Officer [Member]
Related Party Transaction [Line Items]
Consideration for printing machine					1,000,000					1,000,000
Revenue - related party									185,000	815,000
Amounts due from related parties reflected in accounts receivable					$ 90,000					90,000
3D Printing Machines [Member] | March 2015 Sale Agreement [Member] | Chairman And Chief Executive Officer [Member]
Related Party Transaction [Line Items]
Consideration for printing machine				$ 950,000
Revenue - related party									913,000
Remaining deferred consideration	37,000								37,000
3D Printing Machines [Member] | June 2015 Sale Agreement [Member] | Board Of Director [Member]
Related Party Transaction [Line Items]
Consideration for printing machine			$ 146,000
Revenue - related party									146,000
3D Printing Machines [Member] | December 2015 Sale Agreement [Member] | Board Of Director [Member]
Related Party Transaction [Line Items]
Consideration for printing machine	$ 120,000								120,000
Revenue - related party									120,000
Other Related Party [Member]
Related Party Transaction [Line Items]
Revenue - related party									71,000	56,000	$ 0
Consulting [Member] | Hans J. Sack [Member]
Related Party Transaction [Line Items]
Payments for services received from related parties										$ 75,000
Consulting arrangement consideration included in selling, general and administrative expenses									$ 50,000

Segment, Product and Geograph96

Segment, Product and Geographic Information - Revenue by Product (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Revenue from External Customer [Line Items]
Revenues	$ 16,198	$ 8,864	$ 8,498	$ 6,793	$ 15,765	$ 9,649	$ 11,201	$ 7,285	$ 40,353	$ 43,900	$ 39,480
3D Printing Machines [Member]
Revenue from External Customer [Line Items]
Revenues									15,464	22,792	24,851
3D Printed and Other Products, Materials and Services [Member]
Revenue from External Customer [Line Items]
Revenues									$ 24,889	$ 21,108	$ 14,629

Segment, Product and Geograph97

Segment, Product and Geographic Information - Geographic Information for Revenue (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	$ 16,198	$ 8,864	$ 8,498	$ 6,793	$ 15,765	$ 9,649	$ 11,201	$ 7,285	$ 40,353	$ 43,900	$ 39,480
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									19,817	21,115	14,596
Germany [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									14,174	18,118	14,744
Japan [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									5,613	4,623	$ 10,140
Italy [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									684	$ 44
Sweden [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									$ 65

Segment, Product and Geograph98

Segment, Product and Geographic Information - Geographic Information for Long-Lived Assets (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	$ 54,832	$ 55,298
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	20,984	20,334
Germany [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	27,417	28,522
Japan [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	5,210	4,978
Italy [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	1,213	$ 1,464
Sweden [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	$ 8

Subsequent Events - Additional

Subsequent Events - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	Jan. 11, 2016	Jan. 08, 2016	Mar. 22, 2016	Sep. 30, 2013	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Subsequent Event [Line Items]
Sale of common equity, value							$ 90,371
Net proceeds from issuance of common stock - secondary public offering				$ 157,311	$ 0	$ 0	64,948
Offering costs					$ 215	$ 0	$ 0
Subsequent Event [Member] | At Market Issuance Offering [Member] | FBR Capital Markets & Co. and MLV & Co. LLC [Member]
Subsequent Event [Line Items]
Percentage of commission on sale of common equity shares		3.00%
Reimbursement of certain legal expenses		$ 25
Common stock, new shares sold by Company			91,940
Weighted average selling price per share			$ 9.17
Gross proceeds from the sale of shares			$ 843
Net proceeds from issuance of common stock - secondary public offering			595
Offering costs			248
Payments related to reimbursement of certain legal expenses and commissions			$ 50
Subsequent Event [Member] | At Market Issuance Offering [Member] | FBR Capital Markets & Co. and MLV & Co. LLC [Member] | Maximum [Member]
Subsequent Event [Line Items]
Sale of common equity, value		$ 50,000
Subsequent Event [Member] | Registered Direct Offering [Member] | Rockwell Forest Products, Inc. and S. Kent Rockwell [Member]
Subsequent Event [Line Items]
Common stock, new shares sold by Company	1,423,877
Gross proceeds from the sale of shares	$ 13,000
Net proceeds from issuance of common stock - secondary public offering	12,447
Offering costs	$ 553
Common stock price per share	$ 9.13
Premium per share on closing price	$ 0.50

Supplemental Quarterly Finan100

Supplemental Quarterly Financial Information - Summary of Supplemental Quarterly Financial Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended																12 Months Ended
	Dec. 31, 2015		Sep. 30, 2015		Jun. 30, 2015		Mar. 31, 2015		Dec. 31, 2014		Sep. 30, 2014		Jun. 30, 2014		Mar. 31, 2014		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Quarterly Financial Information Disclosure [Abstract]
Revenue - third party	$ 16,057		$ 8,712		$ 7,358		$ 6,791		$ 14,926		$ 9,640		$ 11,200		$ 7,263		$ 38,918	$ 43,029	$ 39,480
Revenue - related party	141		152		1,140		2		839		9		1		22		1,435	871	0
Revenue	16,198		8,864		8,498		6,793		15,765		9,649		11,201		7,285		40,353	43,900	39,480
Gross profit	6,069		1,169		1,105				3,855		2,487		2,496		1,619		8,343	10,457	15,573
Net loss attributable to ExOne	$ (1,219)		$ (10,077)		$ (6,898)		$ (7,671)		$ (7,200)		$ (4,451)		$ (4,665)		$ (5,527)		$ (25,865)	$ (21,843)	$ (6,455)
Net loss attributable to ExOne per common share:
Basic	$ (0.08)	[1]	$ (0.70)	[1]	$ (0.48)	[1]	$ (0.53)	[1]	$ (0.50)	[1]	$ (0.31)	[1]	$ (0.32)	[1]	$ (0.38)	[1]	$ (1.79)	$ (1.52)	$ (0.51)
Diluted	$ (0.08)	[1]	$ (0.70)	[1]	$ (0.48)	[1]	$ (0.53)	[1]	$ (0.50)	[1]	$ (0.31)	[1]	$ (0.32)	[1]	$ (0.38)	[1]	$ (1.79)	$ (1.52)	$ (0.51)
[1]	Per-share amounts are calculated independently for each quarter presented; therefore the sum of the quarterly per-share amounts may not equal the per-share amounts for the year.