ExOne (XONE) 10-K 26 Mar 15 2014 FY Annual report Financial data

Document_and_Entity_Informatio

Document and Entity Information (USD $)	12 Months Ended
In Millions, except Share data, unless otherwise specified	Dec. 31, 2014	Mar. 20, 2015	Jun. 30, 2014
Document And Entity Information [Abstract]
Document Type	10-K
Amendment Flag	FALSE
Document Period End Date	31-Dec-14
Document Fiscal Year Focus	2014
Document Fiscal Period Focus	FY
Trading Symbol	XONE
Entity Registrant Name	ExOne Co
Entity Central Index Key	1561627
Current Fiscal Year End Date	-19
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		14,521,137
Entity Public Float			$414.60

Statement_of_Consolidated_Oper

Statement of Consolidated Operations and Comprehensive Loss (USD $)	12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Statement [Abstract]
Revenue (Note 17)	$43,900	$39,480	$28,657
Cost of sales	33,443	23,907	16,514
Gross profit	10,457	15,573	12,143
Operating expenses
Research and development	8,178	5,127	1,930
Selling, general and administrative	24,029	16,119	18,285
Total operating expenses	32,207	21,246	20,215
Loss from operations	-21,750	-5,673	-8,072
Other (income) expense
Interest expense	144	372	842
Other income - net	-210	-98	-221
Total other (income) expense	-66	274	621
Loss before income taxes	-21,684	-5,947	-8,693
Provision for income taxes* (Note 14)	159	370	995	[1]
Net loss	-21,843	-6,317	-9,688
Less: Net income attributable to noncontrolling interests		138	480
Net loss attributable to ExOne	-21,843	-6,455	-10,168
Net loss attributable to ExOne per common share (Note 3):
Basic	($1.52)	($0.51)		[1]
Diluted	($1.52)	($0.51)		[1]
Comprehensive loss:
Net loss	-21,843	-6,317	-9,688
Other comprehensive (loss) income:
Foreign currency translation adjustments	-7,851	-178	46
Comprehensive loss	-29,694	-6,495	-9,642
Less: Comprehensive (loss) income attributable to noncontrolling interests		138	480
Comprehensive loss attributable to ExOne	($29,694)	($6,633)	($10,122)
[1]	Information not comparable for 2012 as a result of the Reorganization of the Company as a corporation on January 1, 2013 (Note 1).

Consolidated_Balance_Sheet

Consolidated Balance Sheet (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Current assets:
Cash and cash equivalents	$36,202	$98,445
Accounts receivable - net	14,238	9,042
Inventories - net (Note 5)	17,014	12,764
Prepaid expenses and other current assets	3,138	3,297
Total current assets	70,592	123,548
Property and equipment - net (Note 6)	55,298	32,772
Goodwill (Note 7)	4,665	0
Other noncurrent assets (Note 7)	2,875	2,115
Total assets	133,430	158,435
Current liabilities:
Current portion of long-term debt (Note 9)	132	127
Current portion of capital and financing leases (Note 10)	346	549
Accounts payable	2,553	1,748
Accrued expenses and other current liabilities (Note 11)	8,424	5,394
Deferred revenue and customer prepayments	902	916
Total current liabilities	12,357	8,734
Long-term debt - net of current portion (Note 9)	1,950	2,082
Capital and financing leases - net of current portion (Note 10)	164	475
Other noncurrent liabilities	414	444
Total liabilities	14,885	11,735
Contingencies and commitments (Note 12)
Stockholders' equity
Common stock, $0.01 par value, 200,000,000 shares authorized, 14,417,803 (2014) and 14,387,608 (2013) shares issued and outstanding	144	144
Additional paid-in capital	154,902	153,363
Accumulated deficit	-28,298	-6,455
Accumulated other comprehensive loss (Note 2)	-8,203	-352
Total stockholders' equity	118,545	146,700
Total liabilities and stockholders' equity	$133,430	$158,435

Consolidated_Balance_Sheet_Par

Consolidated Balance Sheet (Parenthetical) (USD $)	Dec. 31, 2014	Dec. 31, 2013
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	14,417,803	14,387,608
Common stock, shares outstanding	14,417,803	14,387,608

Statement_of_Consolidated_Cash

Statement of Consolidated Cash Flows (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Operating activities
Net loss	($21,843)	($6,317)	($9,688)
Adjustments to reconcile net loss to cash used for operations:
Depreciation and amortization	4,520	2,372	1,683
Deferred income taxes	-131
Equity-based compensation	1,206	711	7,735
Provision for bad debts	2,391	152	40
Changes in fair value of contingent consideration	-185
Changes in assets and liabilities, excluding effects of acquisitions and foreign currency translation adjustments:
Increase in accounts receivable	-7,162	-823	-7,117
Increase in inventories	-9,098	-8,083	-4,691
Increase in prepaid expenses and other assets	-377	-4,334	-338
(Decrease) increase in accounts payable	-97	-1,100	1,575
Increase in accrued expenses and other liabilities	1,861	937	1,528
Decrease in deferred revenue and customer prepayments	-17	-3,707	-404
Cash used for operating activities	-28,932	-20,192	-9,677
Investing activities
Capital expenditures	-23,081	-19,311	-1,858
Acquisitions, net of cash acquired of $201	-9,155
Cash effect of deconsolidation of noncontrolling interests in variable interest entities		-2,327
Cash used for investing activities	-32,236	-21,638	-1,858
Financing activities
Net proceeds from issuance of common stock-initial public offering		91,083
Net proceeds from issuance of common stock-secondary public offering		64,948
Proceeds from exercise of employee stock options	333
Net change in line of credit borrowings		-528	528
Net change in demand note payable to member		-9,885	8,629
Proceeds from long-term debt			1,194
Proceeds from financing leases			3,513
Payments on long-term debt	-465	-5,488	-1,626
Payments on capital and financing leases	-545	-2,162	-437
Payment of preferred stock dividends		-456
Deferred offering costs			-712
Deferred financing costs			-78
Cash (used for) provided by financing activities	-677	137,512	11,011
Effect of exchange rate changes on cash and cash equivalents	-398	-39	-170
Net change in cash and cash equivalents	-62,243	95,643	-694
Cash and cash equivalents at beginning of period	98,445	2,802	3,496
Cash and cash equivalents at end of period	36,202	98,445	2,802
Supplemental disclosure of cash flow information
Cash paid for interest	144	310	407
Cash paid for income taxes	916	1,334	1,354
Supplemental disclosure of noncash investing and financing activities
Net assets acquired through acquisitions, net of cash acquired of $201	9,530
Noncash consideration for acquisitions	375
Property and equipment included in accounts payable	819
Property and equipment acquired through financing arrangements	89	282	2,700
Transfer of inventories to property and equipment for internal use	5,344	3,338	2,001
Transfer of internally developed 3D printing machines from property and equipment to inventories for sale	1,287	534	336
Conversion of preferred stock dividends payable and accrued interest to principal amounts due under the demand note payable to member		1,219	37
Noncash effect of Reorganization of The Ex One Company, LLC with and into The ExOne Company		2,371
Noncash effect of deconsolidation of noncontrolling interests in variable interest entities		397
Preferred unit dividends declared but unpaid			1,437
Reclassification of redeemable preferred units to preferred units			$18,984

Statement_of_Consolidated_Cash1

Statement of Consolidated Cash Flows (Parenthetical) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014
Statement of Cash Flows [Abstract]
Cash acquired from acquisitions	$201

Statement_of_Changes_in_Consol

Statement of Changes in Consolidated Stockholders' / Members' Equity (Deficit) (USD $)	Total	Prior to Reorganization [Member]	Preferred Units [Member]	Common Units [Member]	Common Units [Member]	Members' Deficit [Member]	Members' Deficit [Member]	Preferred Stock [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Deficit [Member]	Accumulated Other Comprehensive Loss [Member]	Accumulated Other Comprehensive Loss [Member]	Noncontrolling Interests [Member]	Noncontrolling Interests [Member]
In Thousands, except Share data					Prior to Reorganization [Member]		Prior to Reorganization [Member]						Prior to Reorganization [Member]		Prior to Reorganization [Member]
Beginning Balance at Dec. 31, 2011		($15,599)			$10,000		($27,485)						($220)		$2,106
Beginning Balance, Shares at Dec. 31, 2011					10,000,000
Preferred unit reclassification	18,984		18,984
Preferred unit reclassification, Shares			18,984,000
Preferred stock dividends	-1,437					-1,437
Equity-based compensation	7,735					7,735
Net loss	-9,688					-10,168								480
Other comprehensive income (loss)	46											46
Ending Balance at Dec. 31, 2012	41		18,984	10,000		-31,355						-174		2,586
Ending Balance, Shares at Dec. 31, 2012			18,984,000	10,000,000
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			-18,984,000	-10,000,000				190,000	5,800,000
Preferred stock dividends	-152									-152
Conversion of preferred stock to common stock								-190	20	170
Conversion of preferred stock to common stock, Shares								-190,000	1,998,000
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									5,483,000
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									1,106,000
Equity-based compensation	711									711
Net loss	-6,317										-6,455			138
Other comprehensive income (loss)	-178											-178
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									14,387,000
Equity-based compensation	1,206									1,206
Net loss	-21,843										-21,843
Other comprehensive income (loss)	-7,851											-7,851
Common stock issued from equity incentive plan	333									333
Common stock issued from equity incentive plan, shares									30,000
Ending Balance at Dec. 31, 2014	$118,545								$144	$154,902	($28,298)	($8,203)
Ending Balance, Shares at Dec. 31, 2014									14,417,000

Summary_of_Significant_Account

Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2014
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 Company has considered the proforma effects of its Reorganization on the provision for income taxes for 2012 in its statement of consolidated operations and comprehensive loss and concluded that there would be no difference as compared to the amounts reported, principally due to valuation allowances established against net deferred tax assets. In addition, the Company has omitted basic and diluted earnings per share for the respective comparative year as a result of the Reorganization, as the basis for such calculation is not comparable to the subsequent year’s presentation.
	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 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) 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.
	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 net losses of approximately $21,843, $6,317 and $9,688 for 2014, 2013 and 2012, respectively. Prior to Reorganization the Company operated as a limited liability company and was substantially supported by the continued financial support provided by its majority member. 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. Management believes that the Company’s existing capital resources will be sufficient to support the Company’s operations through January 1, 2016.
	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 U.S. dollar equivalents based upon year end exchange rates, and are included in stockholders’ / members’ equity (deficit) as a component of other comprehensive income (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) income 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 51.9%, 63.0% and 72.8% of the consolidated revenue of the Company was derived from transactions outside the United States for 2014, 2013 and 2012, 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) collectibility is reasonably assured.
	The Company enters into arrangements that may provide for multiple deliverables to a customer. Sales of 3D printing machines generally include ancillary equipment, materials, installation and training services, the value of a warranty and other optional products and/or services. 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 warranty is not treated as a separate service because the 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 contract period. After the initial twelve month warranty period, the Company offers its customers optional maintenance service contracts. Deferred maintenance service revenue is 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 other 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 collectibility 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 collectibility cannot be reasonably assured, the Company will defer recognition of revenue until collectibility 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 2014, 2013 and 2012, 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 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.
	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, 2014 and 2013, the allowance for doubtful accounts was approximately $2,431 and $63, respectively. During 2014, 2013 and 2012 the Company recorded provisions for bad debts of approximately $2,391, $152 and $40, respectively, associated with customer balances for which collectibility 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 current 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 thirty-five 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, with fair value determined using the best information available, which generally is a discounted cash flow model. The determination of what constitutes an asset group, the associated undiscounted net cash flows, and the estimated useful lives of assets require significant judgments and estimates by management. No impairment loss was recorded by the Company during 2014, 2013 or 2012.
	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, such as (i) the existence of a control premium in acquiring all of the outstanding shares of the Company, (ii) current trading multiples of comparable entities in comparison to the Company and (iii) market pricing from comparable merger and acquisition transactions. 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.
	The Company completed its annual review of goodwill during the fourth quarter of 2014 proceeding directly to the two-step quantitative impairment test. The estimated fair value of the Company’s singular reporting unit was determined to be in excess of its carrying value, resulting in no impairment.
	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 contract period. 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, 2014 and 2013, product warranty reserves were approximately $1,543 and $943, respectively, and were included in accrued expenses and other current liabilities in the consolidated balance sheet.
	Income Taxes
	Prior to Reorganization, the Company was organized as a limited liability company. Under the provisions of the Internal Revenue Code and similar state provisions, the Company was taxed as a partnership and was not liable for income taxes. Instead, earnings and losses were included in the tax returns of its members. Therefore, for periods prior to Reorganization, the consolidated financial statements do not reflect a provision for U.S. federal or state income taxes.
	The Company’s subsidiaries in Germany, Italy and Japan are taxed as corporations under the taxing regulations of Germany, Italy and Japan, respectively. As a result, the consolidated statement of operations and comprehensive loss includes a 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 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.
	The Company recognizes deferred tax assets and liabilities for the differences between the financial statement carrying amounts and the tax basis of assets and liabilities in their respective jurisdictions using enacted tax rates in effect in the years in which the differences are expected to reverse. Valuation allowances are established when necessary to reduce deferred tax assets to the amount expected to be realized.
	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 2014, 2013 or 2012.
	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 $269, $92 and $90 in 2014, 2013 and 2012, 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. The Company recognized total equity-based compensation expense of approximately $1,206, $711 and $7,735 during 2014, 2013 and 2012, respectively.
	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.
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, 2018, or January 1, 2017, in the event that the Company no longer qualifies as an emerging growth company in accordance with 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 July 2013, the FASB issued 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. This change becomes effective for the Company on January 1, 2015. The adoption of this guidance is not expected to have a material impact on the consolidated financial statements of the Company.

Accumulated_Other_Comprehensiv

Accumulated Other Comprehensive Loss	12 Months Ended
	Dec. 31, 2014
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,	2014			2013			2012
	Foreign currency translation adjustments
	Balance at beginning of period	$	(352	)	$	(174	)	$	(220	)
	Other comprehensive (loss) income		(7,851	)		(178	)		46
	Balance at end of period	$	(8,203	)	$	(352	)	$	(174	)
	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 (U.S. 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.

Earnings_Per_Share

Earnings Per Share	12 Months Ended
	Dec. 31, 2014
Earnings Per Share [Abstract]
Earnings Per Share	Note 3. Earnings 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.
	The weighted average shares outstanding for 2013 include (i) 5,800,000 common shares following the exchange of common units in the former limited liability company for common shares in the Company on a 0.58:1.00 basis in connection with the Reorganization of the Company on January 1, 2013, (ii) the issuance of 5,483,333 common shares in connection with the commencement of the initial public offering of the Company on February 6, 2013, (iii) 1,998,275 common shares following the conversion of preferred shares to common shares in the Company on a 9.5:1.0 basis in connection with the closing of the initial public offering of the Company on February 12, 2013, and (iv) the issuance of 1,106,000 common shares in connection with the commencement of the secondary public offering of the Company on September 9, 2013.
	The weighted average shares outstanding for 2014 additionally include (i) the issuance of 5,000 shares of common stock to the independent members of the Board of Directors in the form of a stock bonus award on March 20, 2014, (ii) the annual vesting of 6,666 shares of restricted stock during 2014 and (iii) the issuance of 18,529 shares of common stock during 2014 as a result of employee exercises of incentive stock options.
	As ExOne incurred a net loss during 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 (215,137 — 2014 and 173,333 — 2013) and unvested restricted stock issued (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,	2014			2013
	Net loss attributable to ExOne	$	(21,843	)	$	(6,455	)
	Less: Preferred stock dividends declared		—			(152	)
	Net loss available to ExOne common shareholders	$	(21,843	)	$	(6,607	)
	Weighted average shares outstanding (basic and diluted)		14,411,054			12,838,230
	Net loss attributable to ExOne per common share:
	Basic	$	(1.52	)	$	(0.51	)
	Diluted	$	(1.52	)	$	(0.51	)
	The Company has omitted basic and diluted earnings per share for 2012 as a result of the Reorganization of the Company (Note 1), as the basis for such calculation is not comparable to subsequent period presentation.

Acquisitions

Acquisitions	12 Months Ended
	Dec. 31, 2014
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, 2014
Inventory Disclosure [Abstract]
Inventories	Note 5. Inventories
	Inventories consist of the following at December 31:
		2014		2013
	Raw materials and components	$	10,838	$	6,253
	Work in process		4,221		5,957
	Finished goods		1,955		554
		$	17,014	$	12,764
	Raw materials and components consist of consumable materials and component parts associated with 3D printing machine manufacturing and support activities. Work in process consists of 3D printing machines, subassemblies 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, 2014 and 2013, the allowance for slow-moving and obsolete inventories was approximately $1,241 and $750, 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, 2014, is approximately $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, 2014
Property, Plant and Equipment [Abstract]
Property and Equipment	Note 6. Property and Equipment
	Property and equipment consist of the following at December 31:
		2014			2013			Economic Life
								(in years)
	Land	$	7,154		$	5,216			N/A
	Buildings and related improvements		27,031			6,377			35
	Machinery and equipment		18,510			11,452			25-Mar
	Other		4,935			2,129			7-Mar
			57,630			25,174
	Less: Accumulated depreciation		(7,213	)		(5,096	)
			50,417			20,078
	Construction-in-progress		4,881			12,694
	Property and equipment — net	$	55,298		$	32,772
	Machinery and equipment includes assets leased by the Company of approximately $1,057 and $1,282 at December 31, 2014 and 2013, respectively.
	Machinery and equipment includes assets leased to customers under operating lease arrangements of approximately $1,371 and $261 at December 31, 2014 and 2013, respectively. The carrying value of these assets was approximately $844 and $53 at December 31, 2014 and 2013, respectively. Minimum future rentals of machinery and equipment under non-cancellable arrangements at December 31, 2014, are not significant on the basis of terms of the related contracts.
	Depreciation expense was approximately $4,139, $2,372 and $1,683 for 2014, 2013 and 2012, respectively.

Goodwill_and_Other_Intangible_

Goodwill and Other Intangible Assets	12 Months Ended
	Dec. 31, 2014
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Other Intangible Assets	Note 7. Goodwill and Other Intangible Assets
	The following table details the changes in the carrying amount of goodwill:
	Balance at December 31, 2013	$	—
	Acquisition of businesses		5,092
	Foreign currency translation adjustments		(427	)
	Balance at December 31, 2014	$	4,665
	There were no goodwill impairment charges recorded during 2014 or accumulated impairment losses recorded at December 31, 2014.
	Other intangible assets, which are included in other noncurrent assets on the accompanying consolidated balance sheet, were as follows:
	December 31, 2014	Gross			Accumulated			Net
		Carrying			Amortization
		Amount
	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
	There were no intangible assets recorded by the Company at December 31, 2013. Amortization expense related to the intangible assets was approximately $381 for 2014.
	Future estimated amortization expense related to the intangible assets at December 31, 2014, is approximately as follows:
	2015	$	453
	2016		453
	2017		449
	2018		134
	2019		67
	Thereafter		76
		$	1,632

Line_of_Credit

Line of Credit	12 Months Ended
	Dec. 31, 2014
Debt Disclosure [Abstract]
Line of Credit	Note 8. Line of Credit
	The Company has a line of credit agreement which provides for short-term borrowings or cash advances (overdrafts) with a German bank collateralized by certain assets of the Company for approximately $700 (€600). At December 31, 2014, the interest rate associated with short-term borrowings or cash advances was 6.20% (additional amounts beyond available capacity would bear interest at 10.20%). The agreement has an indefinite term and is subject to cancellation by either party at any time upon repayment of short-term borrowings or cash advances. There is no commitment fee associated with this agreement.
	At December 31, 2014, the Company identified that it was not in compliance with the annual equity ratio covenant associated with the line of credit agreement. The Company did not obtain a waiver related to compliance with this annual covenant and believes its borrowing abilities to be restricted on the basis of an event of default under the agreement. At December 31, 2014 and 2013, there were no outstanding short-term borrowings or cash advances on the line of credit. Based on the cancellable nature of the agreement, any future requests for short-term borrowings or cash advances under this arrangement would be subject to approval by the bank. Related to the 2014 noncompliance, there were no cross default provisions or related impacts on other lending agreements.
	The Company also maintains certain agreements for transactions requiring security (letters of credit or guarantees) with a German bank. At December 31, 2014, the interest rate associated with transactions requiring security was 1.75%. At December 31, 2014 and 2013, the Company had transactions guaranteed by these agreements of approximately $1,442 (€1,186) and $982 (€713), respectively.

LongTerm_Debt

Long-Term Debt	12 Months Ended
	Dec. 31, 2014
Debt Disclosure [Abstract]
Long-Term Debt	Note 9. Long-Term Debt
	Long-term debt consists of the following at December 31:
		2014		2013
	Building note payable to a bank	$	2,082	$	2,209
	Terms of the building note payable to a bank include monthly payments of approximately $18 including interest at 4.00% through May 2017, and subsequently, the monthly average yield on U.S. Treasury Securities plus 3.25% for the remainder of the term through May 2027.
	At December 31, 2014, 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 the bank. The Company requested and was granted a waiver related to compliance with this annual covenant as of December 31, 2014 and 2015. Related to the 2014 noncompliance, there were no cross default provisions or related impacts on other lending agreements.
	Future maturities of long-term debt at December 31, 2014, are approximately as follows:
	2015	$	132
	2016		138
	2017		139
	2018		143
	2019		151
	Thereafter		1,379
		$	2,082

Leases

Leases	12 Months Ended
	Dec. 31, 2014
Debt Disclosure [Abstract]
Leases	Note 10. Leases
	Capital and 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. The present value of the future minimum lease payments, including an interest rate of 6.0%, was approximately $207 (€170) and $468 (€340) at December 31, 2014 and 2013, respectively.
	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. The present value of the future minimum lease payments, including an interest rate of 6.0%, was approximately $60 (€49) and $330 (€239) at December 31, 2014 and 2013, respectively.
	In addition, the Company leases certain other equipment and vehicles under capital lease arrangements, expiring in various years through 2019.
	Future maturities of capital and financing leases at December 31, 2014, are approximately as follows:
	2015	$	346
	2016		82
	2017		72
	2018		8
	2019		2
	Thereafter		—
		$	510
	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, 2014, are approximately as follows:
	2015	$	421
	2016		338
	2017		275
	2018		180
	2019		45
	Thereafter		22
		$	1,281
	Rent expense under operating lease arrangements was approximately $982, $1,072 and $984 for 2014, 2013 and 2012, respectively.

Accrued_Expenses_and_Other_Cur

Accrued Expenses and Other Current Liabilities	12 Months Ended
	Dec. 31, 2014
Payables and Accruals [Abstract]
Accrued Expenses and Other Current Liabilities	Note 11. Accrued Expenses and Other Current Liabilities
	Accrued expenses and other current liabilities consist of the following at December 31:
		2014		2013
	Accrued payroll and related costs	$	2,087	$	1,266
	Product warranty reserves		1,543		943
	Accrued sales commissions		951		315
	Liability for uncertain tax positions		871		768
	Accrued professional fees		405		298
	Accrued license fees		392		880
	Deferred income taxes		306		—
	Other		1,869		924
		$	8,424	$	5,394

Contingencies_and_Commitments

Contingencies and Commitments	12 Months Ended
	Dec. 31, 2014
Commitments and Contingencies Disclosure [Abstract]
Contingencies and Commitments	Note 12. 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.

EquityBased_Compensation

Equity-Based Compensation	12 Months Ended
	Dec. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Equity-Based Compensation	Note 13. Equity-Based Compensation
	2013 Equity Incentive Plan
	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 1,992,242 shares, subject to certain adjustments.
	The following table summarizes the total equity-based compensation expense recognized for awards issued under the Plan:
			2014			2013
	Equity-based compensation expense recognized:
	Incentive stock options		$	633		$	580
	Restricted stock			376			131
	Stock bonus awards			197			—
	Total equity-based compensation expense before income taxes			1,206			711
	Benefit for income taxes*			—			—
	Total equity-based compensation expense net of income taxes		$	1,206		$	711
	*	The benefit for income taxes from equity-based compensation has been determined to be $0 based on valuation allowances against net deferred tax assets for 2014 and 2013. In the absence of valuation allowances against net deferred tax assets, the tax benefit derived from equity-based compensation has been estimated to be approximately $231 and $119 for 2014 and 2013, respectively.
	At December 31, 2014, total future compensation expense related to unvested awards yet to be recognized by the Company was approximately $1,276 for incentive stock options (“ISOs”) and $1,490 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 2.2 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.
	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		$	9.6		$	11.03
	Volatility			67	%		68.7	%
	Average risk-free interest rate			1.76	%		1.07	%
	Dividend yield			0	%		0	%
	Expected term (years)			6			6
	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:
			2014								2013
			Number of			Weighted			Weighted		Number of			Weighted		Weighted
			ISOs			Average			Average Grant		ISOs			Average		Average Grant
						Exercise Price			Date Fair					Exercise Price		Date Fair
									Value							Value
	Outstanding at beginning of year			173,333		$	18		$	11.03		—		$	—	$	—
	ISOs granted			62,000		$	15.74		$	9.6		180,000		$	18	$	11.03
	ISOs exercised			(18,529	)	$	18		$	11.03		—		$	—	$	—
	ISOs forfeited			(1,667	)	$	18		$	11.03		(6,667	)	$	18	$	11.03
	Outstanding at end of year			215,137		$	17.35		$	10.62		173,333		$	18	$	11.03
	ISOs exercisable at end of year			39,804		$	18		$	11.03		—		$	—	$	—
	ISOs expected to vest at end of year			166,638		$	17.21		$	10.53		164,852		$	18	$	11.03
	At December 31, 2014, there was no intrinsic value associated with ISOs exercisable. At December 31, 2014, the aggregate intrinsic value of ISOs expected to vest was approximately $62. The weighted average remaining contractual term of ISOs expected to vest at December 31, 2014, was approximately 6.8 years. 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 2013.
	The activity for restricted stock awards was as follows:
			2014						2013
			Shares of			Weighted			Shares of		Weighted
			Restricted			Average Grant			Restricted		Average Grant
			Stock			Date Fair			Stock		Date Fair
						Value					Value
	Outstanding at beginning of year			20,000		$	23.26			—	$	—
	Restricted shares granted			67,500		$	22.69			20,000	$	23.26
	Restricted shares vested			(6,666	)	$	23.26			—	$	—
	Restricted shares forfeited			—		$	—			—	$	—
	Outstanding at end of year			80,834		$	22.78			20,000	$	23.26
	Restricted shares expected to vest			80,834		$	22.78			20,000	$	23.26
	Restricted shares vesting during 2014 had a fair value of approximately $282.
	Other
	In May 2012, the Company’s majority member completed the sale of 300,000 common units of the former limited liability company to another existing member of the former limited liability company for $1.25 per unit. In July and August 2012, the Company’s majority member completed the sale of an additional 1,000,000 common units of the former limited liability company to two executives of the former limited liability company for $1.25 per unit. The fair value of these common units on each of the respective measurement dates was $7.20 per common unit. The Company recognized compensation expense of approximately $7,735 for the year ended December 31, 2012, in connection with the sale of these common units which has been recorded in selling, general and administrative expenses in the statement of consolidated operations and comprehensive loss.
	Determining the fair value of the common units required complex and subjective judgments. The Company used the sale of a similar security in an arms-length transaction with unrelated parties to estimate the value of the enterprise at each of the respective measurement dates, which included assigning a value to the similar security’s rights, preferences and privileges, relative to the common units. The enterprise value was then allocated to the Company’s outstanding equity securities using a Black-Scholes option pricing model. The option pricing required certain estimates to be made, including: (i) the anticipated timing of a potential liquidity event (less than one year), (ii) volatility (65.0%) estimated based on historical volatilities of peer group companies, and (iii) a risk-free interest rate (0.2%).

Income_Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Income Taxes	Note 14. 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:
		2014			2013			2012
	United States	$	(15,683	)	$	(9,675	)	$	(12,634	)
	Foreign		(6,001	)		3,728			3,941
	Loss before income taxes	$	(21,684	)	$	(5,947	)	$	(8,693	)
	The provision (benefit) for income taxes consisted of the following:
		2014									2013						2012
		Current			Deferred			Total			Current		Deferred		Total		Current		Deferred		Total
	United States	$	—		$	20		$	20		$	—	$	—	$	—	$	—	$	—	$	—
	Foreign		290			(151	)		139			370		—		370		995		—		995
	Provision (benefit) for income taxes	$	290		$	(131	)	$	159		$	370	$	—	$	370	$	995	$	—	$	995
	The net benefit for deferred income taxes for 2014 includes approximately $54 associated with net operating loss carryforwards.
	A reconciliation of the provision for income taxes at the U.S. statutory rate of 34.0% to the effective rate of the Company for the years ended December 31 is as follows:
		2014			2013			2012
	U.S. statutory rate (34.0%)	$	(7,373	)	$	(2,022	)	$	(2,956	)
	Unbenefitted limited liability company losses		—			—			3,931
	Taxes on foreign operations		(154	)		(95	)		(164	)
	Increase in uncertain tax positions		210			323			146
	Net change in valuation allowances		6,980			2,029			8
	Permanent differences and other		496			135			30
	Provision for income taxes and effective tax rate	$	159		$	370		$	995
	Effective tax rate		-0.70%			-6.20%			-11.50%
	The components of net deferred income tax assets and net deferred income tax liabilities were as follows:
		2014			2013
	Deferred tax assets
	Accounts receivable	$	836		$	23
	Inventories		300			452
	Property and equipment		403			820
	Accrued expenses and other current liabilities		849			591
	Net operating loss carryforwards		7,375			2,694
	Tax credit carryforwards		765			874
	Other		1,012			266
	Valuation allowance		(11,069	)		(5,172	)
	Total deferred tax assets		471			548
	Deferred tax liabilities
	Other		(794	)		(548	)
	Total deferred tax liabilities		(794	)		(548	)
	Net deferred tax liabilities	$	(323	)	$	—
	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:
		2014			2013
	Beginning balance	$	5,172		$	3,468
	Increase to allowances		6,980			2,029
	Foreign currency translation and other adjustments		(1,083	)		(325	)
	Ending balance	$	11,069		$	5,172
	The increase to allowances for 2013 includes approximately $410 associated with the allowance recorded against the initial net deferred tax asset resulting from the formation of the The ExOne Company as a corporation, taxable for federal, state, local and foreign income tax purposes on January 1, 2013.
	At December 31, 2014, the Company had approximately $3,976 and $13,429 in net operating loss carryforwards which expire in 2033 and 2034, respectively, and $765 in tax credit carryforwards which expire in 2023, to offset the future taxable income of its United States subsidiary. At December 31, 2014, the Company had approximately $2,045 in net operating loss carryforwards which expire from 2015 through 2023, to offset the future taxable income of its Japanese subsidiary. At December 31, 2014, the Company had approximately $4,214 in net operating loss carryforwards which do not expire, to offset the future taxable income of its collective German and Italian subsidiaries.
	The Company has a liability for uncertain tax positions related to certain capitalized expenses and intercompany transactions. At December 31, 2014 and 2013, the liability for uncertain tax positions was approximately $871 and $768, respectively, and is included in accrued expenses and other current liabilities in the consolidated balance sheet. In addition, at December 31, 2014, the Company had a liability for uncertain tax positions related to its ExOne GmbH (Germany) and ExOne KK (Japan) subsidiaries of approximately $195 and $159, respectively, which were fully offset against net operating loss carryforwards of the respective subsidiaries. At December 31, 2013, the Company had a liability for uncertain tax positions related to its ExOne KK (Japan) subsidiary of approximately $93, which was fully offset against net operating loss carryforwards of this subsidiary.
	A reconciliation of the beginning and ending amount of unrecognized tax benefits at December 31 was as follows:
		2014			2013			2012
	Beginning balance	$	768		$	416		$	264
	Increases related to current year tax positions		210			323			146
	Foreign currency translation adjustments		(107	)		29			6
	Ending balance	$	871		$	768		$	416
	The Company includes interest and penalties related to income taxes as a component of the 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) and Japan. The following table summarizes tax years remaining subject to examination for each of the Company’s subsidiaries at December 31, 2014:
	Jurisdiction	Tax Years
		Remaining Subject
		to Examination
	United States		2013-2014
	Germany		2011-2014
	Italy		2014
Japan		2005-2014

Fair_Value_Measurements

Fair Value Measurements	12 Months Ended
	Dec. 31, 2014
Fair Value Disclosures [Abstract]
Fair Value Measurements	Note 15. 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, in accordance with GAAP.
	The following table sets forth the fair value of the Company’s liabilities measured on a recurring basis by level:
			Level			2014		2013
	Accrued expenses and other current liabilities:
	MAM contingent consideration			3		$	190	$	—
	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:
			2014*			2015
	Revenue		$	2,490		$	3,500
	Gross profit		$	623		$	875
	*	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 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 recorded to selling, general and administrative expenses. Changes in contingent consideration recorded by the Company during 2014 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 (resulting in a credit to selling, general and administrative expenses of approximately $195), and (ii) the impact of discounting future cash payments on the associated liabilities (resulting in a charge to selling, general and administrative expense of approximately $10).
	The following table sets forth a summary of changes in the fair value of the Company’s Level 3 financial instruments:
			2014			2013
	Beginning balance		$	—		$	—
	Purchases			—			—
	Sales			—			—
	Issuances			375			—
	Settlements			—			—
	Realized (gains) losses			(195	)		—
	Unrealized (gains) losses			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:
			2014					2013
			Carrying			Fair		Carrying		Fair
			Value			Value		Value		Value
	Cash and cash equivalents		$	36,202		$	36,202	$	98,445	$	98,445
	Current portion of long-term debt		$	132		$	132	$	127	$	127
	Current portion of capital and financing leases		$	346		$	346	$	549	$	549
	Long-term debt — net of current portion		$	1,950		$	2,022	$	2,082	$	1,666
	Capital and financing leases — net of current portion		$	164		$	164	$	475	$	475
	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, 2014
Risks and Uncertainties [Abstract]
Customer Concentrations	Note 16. Customer Concentrations
	During 2014, 2013 and 2012, the Company conducted a significant portion of its business with a limited number of customers. For 2014, 2013 and 2012 the Company’s five most significant customers represented approximately 23.1%, 25.5% and 31.7% of total revenue, respectively. At December 31, 2014 and 2013, accounts receivable from the Company’s five most significant customers were approximately $6,326 and $5,912, respectively.

Related_Party_Transactions

Related Party Transactions	12 Months Ended
	Dec. 31, 2014
Related Party Transactions [Abstract]
Related Party Transactions	Note 17. Related Party Transactions
	In December 2014, the Company entered into a sale agreement for a 3D printing machine with a related entity under common control by the Chairman and CEO of the Company. Total consideration for the 3D printing machine (approximately $1,000) was determined to represent an arms length selling price and was approved prior to execution by the Board of Directors of the Company. The Company recorded revenue of approximately $815 on this sale during 2014 (with the remainder deferred until 2015). During 2014, additional sales of products and/or services to related entities, both individually and in the aggregate, were not significant.
	During 2013 and 2012, the Company provided various services to several related entities under common control by the Chairman and CEO of the Company, primarily in the form of accounting, finance, information technology and human resource outsourcing, which were reimbursed by the related entities. The cost of these services was approximately $133 and $281 for 2013 and 2012, respectively. The provision of these services was discontinued by the Company in 2013.
	Amounts due from related entities at December 31, 2014 and 2013, were not significant.
	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 is approximately $75, of which $25 was included in selling, general and administrative expenses in the statement of consolidated operations and comprehensive loss for 2014 based on the services rendered. In connection with his appointment to the Board of Directors of the Company, approval of this arrangement under company policy for related party transactions was granted.
	Separate from the consulting agreement 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 entities under common control by the Chairman and CEO of the Company. The cost of these products and/or services was approximately $90, $185 and $149 for 2014, 2013 and 2012, respectively. None of the transactions met a threshold requiring review and approval by the Board of Directors of the Company.
	Amounts due to related entities at December 31, 2014 and 2013, were not significant.
	During 2014, the Company also received the benefit of the corporate use of an airplane from a related entity under common control by the Chairman and CEO of the Company for no consideration. The value of this benefit was not significant.

Segment_Product_and_Geographic

Segment, Product and Geographic Information	12 Months Ended
	Dec. 31, 2014
Segment Reporting [Abstract]
Segment, Product and Geographic Information	Note 18. 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 and Japan.
	Revenue by product for the year ended December 31 was as follows:
		2014		2013		2012
	3D printing machines	$	22,792	$	24,851	$	15,668
	3D printed and other products, materials and services		21,108		14,629		12,989
		$	43,900	$	39,480	$	28,657
	Geographic information for revenue for the year ended December 31 was as follows (based on the country where the sale originated):
		2014		2013		2012
	United States	$	21,115	$	14,596	$	7,802
	Germany		18,118		14,744		13,956
	Japan		4,623		10,140		6,899
	Italy		44		—		—
		$	43,900	$	39,480	$	28,657
	Geographic information for long-lived assets at December 31 was as follows (based on the physical location of assets):
		2014		2013
	United States	$	20,334	$	13,257
	Germany		28,522		18,219
	Japan		4,978		1,296
	Italy		1,464		—
		$	55,298	$	32,772

Subsequent_Events

Subsequent Events	12 Months Ended
	Dec. 31, 2014
Subsequent Events [Abstract]
Subsequent Events	Note 19. Subsequent Events
	The Company has evaluated all of its activities and concluded that no 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 below.
	On February 6, 2015, the Board of Directors authorized an aggregate award of 17,500 shares of restricted stock under the 2013 Equity Incentive Plan to certain members of the Board of Directors. These awards vest on the one year anniversary of the date of grant. Separately, on March 16, 2015, the Board of Directors authorized an award of 5,000 shares of restricted stock under the 2013 Equity Incentive Plan to an executive of the Company. These awards vest in one-third increments on the first, second and third anniversaries of the date of grant, respectively.

Supplemental_Quarterly_Financi

Supplemental Quarterly Financial Information	12 Months Ended
	Dec. 31, 2014
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,			September 30,			June 30,			March 31,
		2014			2014			2014			2014
	Revenue	$	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	)
		For the Quarter Ended
		December 31,			September 30,			June 30,			March 31,
		2013			2013			2013			2013
	Revenue	$	10,695		$	11,621		$	9,230		$	7,934
	Gross profit	$	3,303		$	5,251		$	4,181		$	2,838
	Net loss attributable to ExOne	$	(3,197	)	$	(224	)	$	(1,120	)	$	(1,914	)
	Net loss attributable to ExOne per common share*:
	Basic	$	(0.22	)	$	(0.02	)	$	(0.08	)	$	(0.20	)
	Diluted	$	(0.22	)	$	(0.02	)	$	(0.08	)	$	(0.20	)

Summary_of_Significant_Account1

Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2014
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 Company has considered the proforma effects of its Reorganization on the provision for income taxes for 2012 in its statement of consolidated operations and comprehensive loss and concluded that there would be no difference as compared to the amounts reported, principally due to valuation allowances established against net deferred tax assets. In addition, the Company has omitted basic and diluted earnings per share for the respective comparative year as a result of the Reorganization, as the basis for such calculation is not comparable to the subsequent year’s presentation.
	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 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) 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.
	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 net losses of approximately $21,843, $6,317 and $9,688 for 2014, 2013 and 2012, respectively. Prior to Reorganization the Company operated as a limited liability company and was substantially supported by the continued financial support provided by its majority member. 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. Management believes that the Company’s existing capital resources will be sufficient to support the Company’s operations through January 1, 2016.
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 U.S. dollar equivalents based upon year end exchange rates, and are included in stockholders’ / members’ equity (deficit) as a component of other comprehensive income (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) income 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 51.9%, 63.0% and 72.8% of the consolidated revenue of the Company was derived from transactions outside the United States for 2014, 2013 and 2012, 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) collectibility is reasonably assured.
	The Company enters into arrangements that may provide for multiple deliverables to a customer. Sales of 3D printing machines generally include ancillary equipment, materials, installation and training services, the value of a warranty and other optional products and/or services. 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 warranty is not treated as a separate service because the 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 contract period. After the initial twelve month warranty period, the Company offers its customers optional maintenance service contracts. Deferred maintenance service revenue is 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 other 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 collectibility 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 collectibility cannot be reasonably assured, the Company will defer recognition of revenue until collectibility 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 2014, 2013 and 2012, 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 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.
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, 2014 and 2013, the allowance for doubtful accounts was approximately $2,431 and $63, respectively. During 2014, 2013 and 2012 the Company recorded provisions for bad debts of approximately $2,391, $152 and $40, respectively, associated with customer balances for which collectibility 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 current 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 thirty-five 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, with fair value determined using the best information available, which generally is a discounted cash flow model. The determination of what constitutes an asset group, the associated undiscounted net cash flows, and the estimated useful lives of assets require significant judgments and estimates by management. No impairment loss was recorded by the Company during 2014, 2013 or 2012.
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, such as (i) the existence of a control premium in acquiring all of the outstanding shares of the Company, (ii) current trading multiples of comparable entities in comparison to the Company and (iii) market pricing from comparable merger and acquisition transactions. 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.
	The Company completed its annual review of goodwill during the fourth quarter of 2014 proceeding directly to the two-step quantitative impairment test. The estimated fair value of the Company’s singular reporting unit was determined to be in excess of its carrying value, resulting in no impairment.
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 contract period. 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, 2014 and 2013, product warranty reserves were approximately $1,543 and $943, respectively, and were included in accrued expenses and other current liabilities in the consolidated balance sheet.
Income Taxes	Income Taxes
	Prior to Reorganization, the Company was organized as a limited liability company. Under the provisions of the Internal Revenue Code and similar state provisions, the Company was taxed as a partnership and was not liable for income taxes. Instead, earnings and losses were included in the tax returns of its members. Therefore, for periods prior to Reorganization, the consolidated financial statements do not reflect a provision for U.S. federal or state income taxes.
	The Company’s subsidiaries in Germany, Italy and Japan are taxed as corporations under the taxing regulations of Germany, Italy and Japan, respectively. As a result, the consolidated statement of operations and comprehensive loss includes a 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 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.
	The Company recognizes deferred tax assets and liabilities for the differences between the financial statement carrying amounts and the tax basis of assets and liabilities in their respective jurisdictions using enacted tax rates in effect in the years in which the differences are expected to reverse. Valuation allowances are established when necessary to reduce deferred tax assets to the amount expected to be realized.
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 2014, 2013 or 2012.
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 $269, $92 and $90 in 2014, 2013 and 2012, 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. The Company recognized total equity-based compensation expense of approximately $1,206, $711 and $7,735 during 2014, 2013 and 2012, respectively.
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.
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, 2018, or January 1, 2017, in the event that the Company no longer qualifies as an emerging growth company in accordance with 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 July 2013, the FASB issued 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. This change becomes effective for the Company on January 1, 2015. The adoption of this guidance is not expected to have a material impact on the consolidated financial statements of the Company.
Earnings 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_Comprehensiv1

Accumulated Other Comprehensive Loss (Tables)	12 Months Ended
	Dec. 31, 2014
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,	2014			2013			2012
	Foreign currency translation adjustments
	Balance at beginning of period	$	(352	)	$	(174	)	$	(220	)
	Other comprehensive (loss) income		(7,851	)		(178	)		46
	Balance at end of period	$	(8,203	)	$	(352	)	$	(174	)

Earnings_Per_Share_Tables

Earnings Per Share (Tables)	12 Months Ended
	Dec. 31, 2014
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,	2014			2013
	Net loss attributable to ExOne	$	(21,843	)	$	(6,455	)
	Less: Preferred stock dividends declared		—			(152	)
	Net loss available to ExOne common shareholders	$	(21,843	)	$	(6,607	)
	Weighted average shares outstanding (basic and diluted)		14,411,054			12,838,230
	Net loss attributable to ExOne per common share:
	Basic	$	(1.52	)	$	(0.51	)
	Diluted	$	(1.52	)	$	(0.51	)

Acquisitions_Tables

Acquisitions (Tables)	12 Months Ended
	Dec. 31, 2014
MAM Corporation [Member]
Preliminary 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]
Preliminary 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, 2014
Inventory Disclosure [Abstract]
Schedule of Inventories	Inventories consist of the following at December 31:
		2014		2013
	Raw materials and components	$	10,838	$	6,253
	Work in process		4,221		5,957
	Finished goods		1,955		554
		$	17,014	$	12,764

Property_and_Equipment_Tables

Property and Equipment (Tables)	12 Months Ended
	Dec. 31, 2014
Property, Plant and Equipment [Abstract]
Summary of Property and Equipment	Property and equipment consist of the following at December 31:
		2014			2013			Economic Life
								(in years)
	Land	$	7,154		$	5,216			N/A
	Buildings and related improvements		27,031			6,377			35
	Machinery and equipment		18,510			11,452			25-Mar
	Other		4,935			2,129			7-Mar
			57,630			25,174
	Less: Accumulated depreciation		(7,213	)		(5,096	)
			50,417			20,078
	Construction-in-progress		4,881			12,694
	Property and equipment — net	$	55,298		$	32,772

Goodwill_and_Other_Intangible_1

Goodwill and Other Intangible Assets (Tables)	12 Months Ended
	Dec. 31, 2014
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Changes in Carrying Amount of Goodwill	The following table details the changes in the carrying amount of goodwill:
	Balance at December 31, 2013	$	—
	Acquisition of businesses		5,092
	Foreign currency translation adjustments		(427	)
	Balance at December 31, 2014	$	4,665
Schedule of Other Intangible Assets	Other intangible assets, which are included in other noncurrent assets on the accompanying consolidated balance sheet, were as follows:
	December 31, 2014	Gross			Accumulated			Net
		Carrying			Amortization
		Amount
	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, 2014, is approximately as follows:
	2015	$	453
	2016		453
	2017		449
	2018		134
	2019		67
	Thereafter		76
		$	1,632

LongTerm_Debt_Tables

Long-Term Debt (Tables)	12 Months Ended
	Dec. 31, 2014
Debt Disclosure [Abstract]
Components of Long-Term Debt	Long-term debt consists of the following at December 31:
		2014		2013
	Building note payable to a bank	$	2,082	$	2,209
Future Maturities of Long-Term Debt	Future maturities of long-term debt at December 31, 2014, are approximately as follows:
	2015	$	132
	2016		138
	2017		139
	2018		143
	2019		151
	Thereafter		1,379
		$	2,082

Leases_Tables

Leases (Tables)	12 Months Ended
	Dec. 31, 2014
Debt Disclosure [Abstract]
Future Maturities of Capital and Financing Leases	Future maturities of capital and financing leases at December 31, 2014, are approximately as follows:
	2015	$	346
	2016		82
	2017		72
	2018		8
	2019		2
	Thereafter		—
		$	510
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, 2014, are approximately as follows:
	2015	$	421
	2016		338
	2017		275
	2018		180
	2019		45
	Thereafter		22
		$	1,281

Accrued_Expenses_and_Other_Cur1

Accrued Expenses and Other Current Liabilities (Tables)	12 Months Ended
	Dec. 31, 2014
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:
		2014		2013
	Accrued payroll and related costs	$	2,087	$	1,266
	Product warranty reserves		1,543		943
	Accrued sales commissions		951		315
	Liability for uncertain tax positions		871		768
	Accrued professional fees		405		298
	Accrued license fees		392		880
	Deferred income taxes		306		—
	Other		1,869		924
		$	8,424	$	5,394

EquityBased_Compensation_Table

Equity-Based Compensation (Tables)	12 Months Ended
	Dec. 31, 2014
Disclosure of Compensation Related Costs, Share-based 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:
			2014			2013
	Equity-based compensation expense recognized:
	Incentive stock options		$	633		$	580
	Restricted stock			376			131
	Stock bonus awards			197			—
	Total equity-based compensation expense before income taxes			1,206			711
	Benefit for income taxes*			—			—
	Total equity-based compensation expense net of income taxes		$	1,206		$	711
	*	The benefit for income taxes from equity-based compensation has been determined to be $0 based on valuation allowances against net deferred tax assets for 2014 and 2013. In the absence of valuation allowances against net deferred tax assets, the tax benefit derived from equity-based compensation has been estimated to be approximately $231 and $119 for 2014 and 2013, respectively.
Assumptions for Fair Value of ISOs Estimated on the Date of Grant Using the Black-Scholes Option	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		$	9.6		$	11.03
	Volatility			67	%		68.7	%
	Average risk-free interest rate			1.76	%		1.07	%
	Dividend yield			0	%		0	%
	Expected term (years)			6			6
Summary of Activity for ISOs	The activity for ISOs was as follows:
			2014								2013
			Number of			Weighted			Weighted		Number of			Weighted		Weighted
			ISOs			Average			Average Grant		ISOs			Average		Average Grant
						Exercise Price			Date Fair					Exercise Price		Date Fair
									Value							Value
	Outstanding at beginning of year			173,333		$	18		$	11.03		—		$	—	$	—
	ISOs granted			62,000		$	15.74		$	9.6		180,000		$	18	$	11.03
	ISOs exercised			(18,529	)	$	18		$	11.03		—		$	—	$	—
	ISOs forfeited			(1,667	)	$	18		$	11.03		(6,667	)	$	18	$	11.03
	Outstanding at end of year			215,137		$	17.35		$	10.62		173,333		$	18	$	11.03
	ISOs exercisable at end of year			39,804		$	18		$	11.03		—		$	—	$	—
	ISOs expected to vest at end of year			166,638		$	17.21		$	10.53		164,852		$	18	$	11.03
Summary of Activity for Restricted Stock Awards	The activity for restricted stock awards was as follows:
			2014						2013
			Shares of			Weighted			Shares of		Weighted
			Restricted			Average Grant			Restricted		Average Grant
			Stock			Date Fair			Stock		Date Fair
						Value					Value
	Outstanding at beginning of year			20,000		$	23.26			—	$	—
	Restricted shares granted			67,500		$	22.69			20,000	$	23.26
	Restricted shares vested			(6,666	)	$	23.26			—	$	—
	Restricted shares forfeited			—		$	—			—	$	—
	Outstanding at end of year			80,834		$	22.78			20,000	$	23.26
	Restricted shares expected to vest			80,834		$	22.78			20,000	$	23.26

Income_Taxes_Tables

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Schedule of Loss Before Tax	The components of loss before taxes were as follows:
		2014			2013			2012
	United States	$	(15,683	)	$	(9,675	)	$	(12,634	)
	Foreign		(6,001	)		3,728			3,941
	Loss before income taxes	$	(21,684	)	$	(5,947	)	$	(8,693	)
Summary of Income Tax Expense Benefit	The provision (benefit) for income taxes consisted of the following:
		2014									2013						2012
		Current			Deferred			Total			Current		Deferred		Total		Current		Deferred		Total
	United States	$	—		$	20		$	20		$	—	$	—	$	—	$	—	$	—	$	—
	Foreign		290			(151	)		139			370		—		370		995		—		995
	Provision (benefit) for income taxes	$	290		$	(131	)	$	159		$	370	$	—	$	370	$	995	$	—	$	995
Reconciliation of the Provision for Income Taxes	A reconciliation of the provision for income taxes at the U.S. statutory rate of 34.0% to the effective rate of the Company for the years ended December 31 is as follows:
		2014			2013			2012
	U.S. statutory rate (34.0%)	$	(7,373	)	$	(2,022	)	$	(2,956	)
	Unbenefitted limited liability company losses		—			—			3,931
	Taxes on foreign operations		(154	)		(95	)		(164	)
	Increase in uncertain tax positions		210			323			146
	Net change in valuation allowances		6,980			2,029			8
	Permanent differences and other		496			135			30
	Provision for income taxes and effective tax rate	$	159		$	370		$	995
	Effective tax rate		-0.70%			-6.20%			-11.50%
Components of Net Deferred Income Tax Assets and Net Deferred Income Tax Liabilities	The components of net deferred income tax assets and net deferred income tax liabilities were as follows:
		2014			2013
	Deferred tax assets
	Accounts receivable	$	836		$	23
	Inventories		300			452
	Property and equipment		403			820
	Accrued expenses and other current liabilities		849			591
	Net operating loss carryforwards		7,375			2,694
	Tax credit carryforwards		765			874
	Other		1,012			266
	Valuation allowance		(11,069	)		(5,172	)
	Total deferred tax assets		471			548
	Deferred tax liabilities
	Other		(794	)		(548	)
	Total deferred tax liabilities		(794	)		(548	)
	Net deferred tax liabilities	$	(323	)	$	—
Summary of Changes to Valuation Allowances	The following table summarizes changes to the Company’s valuation allowances for the years ended December 31:
		2014			2013
	Beginning balance	$	5,172		$	3,468
	Increase to allowances		6,980			2,029
	Foreign currency translation and other adjustments		(1,083	)		(325	)
	Ending balance	$	11,069		$	5,172
Reconciliation of Unrecognized Tax Benefits	A reconciliation of the beginning and ending amount of unrecognized tax benefits at December 31 was as follows:
		2014			2013			2012
	Beginning balance	$	768		$	416		$	264
	Increases related to current year tax positions		210			323			146
	Foreign currency translation adjustments		(107	)		29			6
	Ending balance	$	871		$	768		$	416
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, 2014:
	Jurisdiction	Tax Years
		Remaining Subject
		to Examination
	United States		2013-2014
	Germany		2011-2014
	Italy		2014
	Japan		2005-2014

Fair_Value_Measurements_Tables

Fair Value Measurements (Tables)	12 Months Ended
	Dec. 31, 2014
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:
			Level			2014		2013
	Accrued expenses and other current liabilities:
	MAM contingent consideration			3		$	190	$	—
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:
			2014*			2015
	Revenue		$	2,490		$	3,500
	Gross profit		$	623		$	875
	*	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:
			2014			2013
	Beginning balance		$	—		$	—
	Purchases			—			—
	Sales			—			—
	Issuances			375			—
	Settlements			—			—
	Realized (gains) losses			(195	)		—
	Unrealized (gains) losses			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:
			2014					2013
			Carrying			Fair		Carrying		Fair
			Value			Value		Value		Value
	Cash and cash equivalents		$	36,202		$	36,202	$	98,445	$	98,445
	Current portion of long-term debt		$	132		$	132	$	127	$	127
	Current portion of capital and financing leases		$	346		$	346	$	549	$	549
	Long-term debt — net of current portion		$	1,950		$	2,022	$	2,082	$	1,666
	Capital and financing leases — net of current portion		$	164		$	164	$	475	$	475

Segment_Product_and_Geographic1

Segment, Product and Geographic Information (Tables)	12 Months Ended
	Dec. 31, 2014
Segment Reporting [Abstract]
Revenue by Product	Revenue by product for the year ended December 31 was as follows:
		2014		2013		2012
	3D printing machines	$	22,792	$	24,851	$	15,668
	3D printed and other products, materials and services		21,108		14,629		12,989
		$	43,900	$	39,480	$	28,657
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):
		2014		2013		2012
	United States	$	21,115	$	14,596	$	7,802
	Germany		18,118		14,744		13,956
	Japan		4,623		10,140		6,899
	Italy		44		—		—
		$	43,900	$	39,480	$	28,657
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):
		2014		2013
	United States	$	20,334	$	13,257
	Germany		28,522		18,219
	Japan		4,978		1,296
	Italy		1,464		—
		$	55,298	$	32,772

Supplemental_Quarterly_Financi1

Supplemental Quarterly Financial Information (Tables)	12 Months Ended
	Dec. 31, 2014
Quarterly Financial Information Disclosure [Abstract]
Schedule of Supplemental Quarterly Financial Information	Supplemental Quarterly Financial Information (unaudited)
	(in thousands, except per-share amounts)
		For the Quarter Ended
		December 31,			September 30,			June 30,			March 31,
		2014			2014			2014			2014
	Revenue	$	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	)
		For the Quarter Ended
		December 31,			September 30,			June 30,			March 31,
		2013			2013			2013			2013
	Revenue	$	10,695		$	11,621		$	9,230		$	7,934
	Gross profit	$	3,303		$	5,251		$	4,181		$	2,838
	Net loss attributable to ExOne	$	(3,197	)	$	(224	)	$	(1,120	)	$	(1,914	)
	Net loss attributable to ExOne per common share*:
	Basic	$	(0.22	)	$	(0.02	)	$	(0.08	)	$	(0.20	)
	Diluted	$	(0.22	)	$	(0.02	)	$	(0.08	)	$	(0.20	)

Summary_of_Significant_Account2

Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)	9 Months Ended	12 Months Ended			0 Months Ended
	Sep. 30, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Feb. 12, 2013	Feb. 06, 2013	Sep. 13, 2013	Sep. 09, 2013
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Date of incorporation		1-Jan-13
State of incorporation		Delaware
Net proceeds of initial public offering			$91,083,000
Net proceeds of secondary public offering	157,311,000		64,948,000
Net income (loss)		-21,843,000	-6,317,000	-9,688,000
Maturity of liquid instruments when purchased		Three months or less
Allowance for doubtful accounts		2,431,000	63,000
Provision for bad debts		2,391,000	152,000	40,000
Impairment losses		0	0	0
Standard product warranty period		Substantially all of the Companybs 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 contract period.
Product warranty reserves		1,543,000	943,000
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		269,000	92,000	90,000
Equity-based contribution		1,206,000	711,000	7,735,000
Impact on the consolidated financial statements		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		35 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		51.90%	63.00%	72.80%
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_Comprehensiv2

Accumulated Other Comprehensive Loss - Summary of Changes in the Components of Accumulated Other Comprehensive Loss (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Statement of Comprehensive Income [Abstract]
Balance at beginning of period	($352)	($174)	($220)
Other comprehensive (loss) income	-7,851	-178	46
Balance at end of period	($8,203)	($352)	($174)

Accumulated_Other_Comprehensiv3

Accumulated Other Comprehensive Loss - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Statement of Comprehensive Income [Abstract]
Accumulated other comprehensive loss, tax	$0	$0	$0
Amounts reclassified to earnings from accumulated other comprehensive loss	$0	$0	$0

Earnings_Per_Share_Additional_

Earnings Per Share - Additional Information (Detail)	0 Months Ended		12 Months Ended		0 Months Ended
	Mar. 20, 2014	Mar. 11, 2014	Dec. 31, 2014	Dec. 31, 2013	Feb. 12, 2013	Feb. 06, 2013	Sep. 09, 2013
Net Income Loss Per Common Share [Line Items]
Conversion ratio of common units in former limited liability company into common shares				0.58
Common stock issued in exchange of common units,re-organization				5,800,000
Restricted stock, vested		6,666
Common stock issued	5,000
Common stock issued related to employee stock option exercises			18,529
Incentive Stock Option [Member]
Net Income Loss Per Common Share [Line Items]
Potential shares of anti-dilutive common stock			215,137	173,333
Restricted Stock Units (RSUs) [Member]
Net Income Loss Per Common Share [Line Items]
Potential shares of anti-dilutive common stock			80,834	20,000
IPO [Member]
Net Income Loss Per Common Share [Line Items]
Conversion ratio of preferred shares into common shares					9.5:1.0
Shares Issued upon conversion of preferred stock					1,998,275
New common shares issuances						5,483,333
Secondary Public Offering [Member]
Net Income Loss Per Common Share [Line Items]
New common shares issuances							1,106,000

Earnings_Per_Share_Computation

Earnings Per Share - Computation of Basic and Diluted Net Loss Attributable to Exone Per Common Share (Detail) (USD $)	3 Months Ended								12 Months Ended
In Thousands, except Share data, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Earnings Per Share [Abstract]
Net loss attributable to ExOne	($7,200)	($4,451)	($4,665)	($5,527)	($3,197)	($224)	($1,120)	($1,914)	($21,843)	($6,455)	($10,168)
Less: Preferred stock dividends declared										-152	-1,437
Net loss available to ExOne common shareholders									($21,843)	($6,607)
Weighted average shares outstanding (basic and diluted)									14,411,054	12,838,230
Net loss attributable to ExOne per common share:
Basic	($0.50)	($0.31)	($0.32)	($0.38)	($0.22)	($0.02)	($0.08)	($0.20)	($1.52)	($0.51)		[1]
Diluted	($0.50)	($0.31)	($0.32)	($0.38)	($0.22)	($0.02)	($0.08)	($0.20)	($1.52)	($0.51)		[1]
[1]	Information not comparable for 2012 as a result of the Reorganization of the Company as a corporation on January 1, 2013 (Note 1).

Acquisitions_Additional_Inform

Acquisitions - Additional Information (Detail)

12 Months Ended

0 Months Ended

12 Months Ended

0 Months Ended

12 Months Ended

0 Months Ended

Dec. 31, 2014

Dec. 31, 2013

Dec. 31, 2012

Mar. 03, 2014

Dec. 31, 2014

Mar. 03, 2014

Mar. 06, 2014

Dec. 31, 2014

Mar. 06, 2014

Mar. 06, 2014

Mar. 27, 2013

Mar. 27, 2013

Mar. 27, 2013

Mar. 27, 2013

USD ($)

USD ($)

USD ($)

MAM Corporation [Member]

MAM Corporation [Member]

MAM Corporation [Member]

MWT Corporation [Member]

MWT Corporation [Member]

MWT Corporation [Member]

MWT Corporation [Member]

Troy Metal Fabricating, LLC [Member]

Lone Star Metal Fabrication, LLC [Member]

Troy Metal Fabricating LLC and Lone Star Metal Fabrication LLC [Member]

Troy Metal Fabricating LLC and Lone Star Metal Fabrication LLC [Member]

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

EUR (€)

USD ($)

USD ($)

USD ($)

USD ($)

Business Acquisition [Line Items]

Total purchase price

$4,917,000

$4,814,000

€ 3,500,000

Purchase price in cash

4,542,000

Purchase price in contingent consideration

375,000

Number of year for earn out provision

2 years

Goodwill

4,665,000

0

1,407,000

3,685,000

0

Goodwill deductible for income tax purpose

1,083,000

Assignment of goodwill

0

0

Gain or loss on extinguishment of debt

0

Acquisition-related expenses

88,000

76,000

143,000

138,000

Payments to acquire assets, including property and equipment

23,081,000

19,311,000

1,858,000

1,900,000

200,000

Repayment of outstanding debt

4,700,000

Return of capital

1,400,000

Property plant and equipment, Carrying value

2,998,000

21,000

5,400,000

Reduction to equity through noncontrolling interest

$2,724,000

$2,724,000

Acquisitions_Preliminary_Alloc

Acquisitions - Preliminary Allocation of Purchase Price (Detail)	Dec. 31, 2014	Dec. 31, 2013	Mar. 03, 2014	Mar. 06, 2014	Mar. 06, 2014
In Thousands, unless otherwise specified	USD ($)	USD ($)	MAM Corporation [Member]	MWT Corporation [Member]	MWT Corporation [Member]
			USD ($)	USD ($)	EUR (€)
Business Acquisition [Line Items]
Cash and cash equivalents				$201
Accounts receivable			209	118
Inventories			224	476
Prepaid expenses and other current assets			15	29
Property and equipment			2,998	21
Intangible assets			503	1,704
Goodwill	4,665	0	1,407	3,685
Total assets			5,356	6,234
Accounts payable			56	128
Accrued expenses and other current liabilities			45	605
Deferred revenue and customer prepayments				195
Long-term debt			338
Deferred income taxes				492
Total liabilities			439	1,420
Total purchase price			$4,917	$4,814	€ 3,500

Acquisitions_Preliminary_Alloc1

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

Acquisitions_Schedule_of_Alloc

Acquisitions - Schedule of Allocation of Purchase Price to Net Assets Acquired and Liabilities (Detail) (USD $)	0 Months Ended
In Thousands, unless otherwise specified	Mar. 03, 2014	Mar. 04, 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

Inventories_Schedule_of_Invent

Inventories - Schedule of Inventories (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Inventory Disclosure [Abstract]
Raw materials and components	$10,838	$6,253
Work in process	4,221	5,957
Finished goods	1,955	554
Inventories	$17,014	$12,764

Inventories_Additional_Informa

Inventories - Additional Information (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Inventory [Line Items]
Allowance for slow-moving and obsolete inventories	$1,241	$750
Laser Micromachining Product [Member]
Inventory [Line Items]
Allowance for slow-moving and obsolete inventories	$419

Property_and_Equipment_Summary

Property and Equipment - Summary of Property and Equipment (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Property, Plant and Equipment [Line Items]
Total gross property and equipment before accumulated depreciation	$57,630	$25,174
Less: Accumulated depreciation	-7,213	-5,096
Property and equipment, excluding construction-in-progress	50,417	20,078
Construction-in-progress	4,881	12,694
Property and equipment - net	55,298	32,772
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	35 years
Land [Member]
Property, Plant and Equipment [Line Items]
Total gross property and equipment before accumulated depreciation	7,154	5,216
Building and Related Improvements [Member]
Property, Plant and Equipment [Line Items]
Total gross property and equipment before accumulated depreciation	27,031	6,377
Property and equipment, Economic Life	35 years
Machinery and Equipment [Member]
Property, Plant and Equipment [Line Items]
Total gross property and equipment before accumulated depreciation	18,510	11,452
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	25 years
Other [Member]
Property, Plant and Equipment [Line Items]
Total gross property and equipment before accumulated depreciation	$4,935	$2,129
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	7 years

Property_and_Equipment_Additio

Property and Equipment - Additional Information (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Property, Plant and Equipment [Line Items]
Depreciation	$4,139	$2,372	$1,683
Machinery and Equipment [Member]
Property, Plant and Equipment [Line Items]
Machinery and equipment	1,057	1,282
Machinery and equipment	1,371	261
Carrying value of assets	$844	$53

Goodwill_and_Other_Intangible_2

Goodwill and Other Intangible Assets - Schedule of Changes in Carrying Amount of Goodwill (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill beginning balance	$0
Acquisition of businesses	5,092
Foreign currency translation adjustments	-427
Goodwill ending balance	$4,665

Goodwill_and_Other_Intangible_3

Goodwill and Other Intangible Assets - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Intangible Liability Disclosure [Abstract]
Goodwill impairment charges	$0
Goodwill impairment losses	0
Intangible assets		0
Amortization of intangible assets	$381,000

Goodwill_and_Other_Intangible_4

Goodwill and Other Intangible Assets - Schedule of Other Intangible Assets (Detail) (USD $)	Dec. 31, 2014
In Thousands, unless otherwise specified
Goodwill And Other Intangible Asset [Line Items]
Gross Carrying Amount	$2,009
Accumulated Amortization	-377
Finite lived intangible asset net	1,632
Unpatented Technology [Member]
Goodwill And Other Intangible Asset [Line Items]
Gross Carrying Amount	1,474
Accumulated Amortization	-307
Finite lived intangible asset net	1,167
Customer Relationships [Member]
Goodwill And Other Intangible Asset [Line Items]
Gross Carrying Amount	464
Accumulated Amortization	-55
Finite lived intangible asset net	409
Trade Names [Member]
Goodwill And Other Intangible Asset [Line Items]
Gross Carrying Amount	56
Accumulated Amortization	-11
Finite lived intangible asset net	45
Noncompete Agreements [Member]
Goodwill And Other Intangible Asset [Line Items]
Gross Carrying Amount	15
Accumulated Amortization	-4
Finite lived intangible asset net	$11

Goodwill_and_Other_Intangible_5

Goodwill and Other Intangible Assets - Future Estimated Amortization Expense Related to the Intangible assets (Detail) (USD $)	Dec. 31, 2014
In Thousands, unless otherwise specified
Finite-Lived Intangible Assets, Net [Abstract]
2015	$453
2016	453
2017	449
2018	134
2019	67
Thereafter	76
Finite lived intangible asset net	$1,632

Line_of_Credit_Additional_Info

Line of Credit - Additional Information (Detail)

12 Months Ended

12 Months Ended

12 Months Ended

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2013

Dec. 31, 2014

Dec. 31, 2013

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2013

Dec. 31, 2013

USD ($)

EUR (€)

Security Agreement [Member]

Short-Term Borrowings [Member]

Short-Term Borrowings [Member]

Cash Advances [Member]

Cash Advances [Member]

Short-Term Borrowings or Cash Advances [Member]

Short-Term Borrowings or Cash Advances [Member]

Compensating Cash Balance [Member]

Compensating Cash Balance [Member]

Compensating Cash Balance [Member]

Compensating Cash Balance [Member]

USD ($)

USD ($)

USD ($)

USD ($)

Additional Borrowing Loans Member

Security Agreement [Member]

Security Agreement [Member]

Security Agreement [Member]

Security Agreement [Member]

USD ($)

EUR (€)

USD ($)

EUR (€)

Line of Credit Facility [Line Items]

Line of credit and security agreement amount

$700,000

€ 600,000

Interest rate

1.75%

6.20%

10.20%

Commitment fee

0

Credit facility, outstanding amount

$0

$0

$0

$0

$1,442,000

€ 1,186,000

$982,000

€ 713,000

LongTerm_Debt_Components_of_Lo

Long-Term Debt - Components of Long-Term Debt (Detail) (Building Note Payable To Bank [Member], USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Building Note Payable To Bank [Member]
Debt Instrument [Line Items]
Note payable to a bank	$2,082	$2,209

LongTerm_Debt_Additional_Infor

Long-Term Debt - Additional Information (Detail) (Building Note Payable To Bank [Member], USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014
Building Note Payable To Bank [Member]
Debt Instrument [Line Items]
Notes payable monthly payments	$18
Building note payable to a bank, with monthly payments interest rate	4.00%
Building note payable to a bank, with monthly payments basis spread	3.25%
Notes payable maturity	2017-05
Notes payable maturity	2027-05

LongTerm_Debt_Future_Maturitie

Long-Term Debt - Future Maturities of Long-Term Debt (Detail) (USD $)	Dec. 31, 2014
In Thousands, unless otherwise specified
Debt Disclosure [Abstract]
2015	$132
2016	138
2017	139
2018	143
2019	151
Thereafter	1,379
Long term debt	$2,082

Leases_Additional_Information_

Leases - Additional Information (Detail)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2013	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2013
	USD ($)	USD ($)	USD ($)	November 2012 [Member]	November 2012 [Member]	November 2012 [Member]	November 2012 [Member]	March 2012 [Member]	March 2012 [Member]	March 2012 [Member]	March 2012 [Member]
				USD ($)	EUR (€)	USD ($)	EUR (€)	USD ($)	EUR (€)	USD ($)	EUR (€)
Sale Leaseback Transaction [Line Items]
Proceeds from sale-leaseback transaction				$974	€ 737			$985	€ 739
Lease repayment period				3 years	3 years			3 years	3 years
Interest rate				6.00%	6.00%	6.00%	6.00%	6.00%	6.00%	6.00%	6.00%
Present value of future minimum lease payments				207	170	468	340	60	49	330	239
Repayment start date				2013-01	2013-01			2012-04	2012-04
Rent expense under operating lease	$982	$1,072	$984

Leases_Future_Maturities_of_Ca

Leases - Future Maturities of Capital and Financing Leases (Detail) (USD $)	Dec. 31, 2011
In Thousands, unless otherwise specified
Leases [Abstract]
2015	$346
2016	82
2017	72
2018	8
2019	2
Thereafter	0
Future maturities of financing leases, total	$510

Leases_Future_Minimum_Lease_Pa

Leases - Future Minimum Lease Payments of Operating Lease Arrangements (Detail) (USD $)	Dec. 31, 2014
In Thousands, unless otherwise specified
Leases [Abstract]
2015	$421
2016	338
2017	275
2018	180
2019	45
Thereafter	22
Future minimum lease payments of operating lease, Total	$1,281

Accrued_Expenses_and_Other_Cur2

Accrued Expenses and Other Current Liabilities - Schedule of Accrued Expenses and Other Current Liabilities (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
In Thousands, unless otherwise specified
Payables and Accruals [Abstract]
Accrued payroll and related costs	$2,087	$1,266
Product warranty reserves	1,543	943
Accrued sales commissions	951	315
Liability for uncertain tax positions	871	768	416	264
Accrued professional fees	405	298
Accrued license fees	392	880
Deferred income taxes	306	0
Other	1,869	924
Accrued expenses and other current liabilities	$8,424	$5,394

EquityBased_Compensation_Addit

Equity-Based Compensation - Additional Information (Detail) (USD $)	1 Months Ended	2 Months Ended	12 Months Ended			0 Months Ended
	31-May-12	Aug. 31, 2012	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Jan. 24, 2013
		Executives
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Shares authorized			200,000,000	200,000,000
Weighted-average remaining vesting period			2 years 2 months 12 days
Proceeds from exercise of stock options			$333,000
Number of stock exercise			18,529
Sale of common unit	300,000	1,000,000
Common unit price per unit	$1.25	$1.25
Fair value of common stock per unit	$7.20	$7.20
Recognized compensation expenses			1,206,000	711,000	7,735,000
Number of executives, additional common units sold		2
Risk free interest rate			0.20%
Common Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Volatility of company equity security			65.00%
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total future compensation expense			1,490,000
ISOs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total future compensation expense			1,276,000
Intrinsic value			0
Aggregate intrinsic value			62,000
Weighted average remaining contractual term			6 years 9 months 18 days
Intrinsic value of ISOs exercised by employee			312,000
Proceeds from exercise of stock options			333,000
Income tax benefit			$0
Number of stock exercise				0
2013 Equity Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock reserved for issuance						500,000
Percentage of outstanding shares of common stock						3.00%
2013 Equity Incentive Plan [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Shares authorized						1,992,242

EquityBased_Compensation_Summa

Equity-Based Compensation - Summary of Total Equity-Based Compensation Expense Recognized for All ISOs, Restricted Stock and Stock Bonus Awards (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Equity-based compensation expense recognized:
Total equity-based compensation expense before income taxes	$1,206,000	$711,000
Benefit for income taxes	0	0
Total equity-based compensation expense net of income taxes	1,206,000	711,000
ISOs [Member]
Equity-based compensation expense recognized:
Total equity-based compensation expense before income taxes	633,000	580,000
Restricted Stock [Member]
Equity-based compensation expense recognized:
Total equity-based compensation expense before income taxes	376,000	131,000
Stock Bonus Awards [Member]
Equity-based compensation expense recognized:
Total equity-based compensation expense before income taxes	$197,000

EquityBased_Compensation_Summa1

Equity-Based Compensation - Summary of Total Equity-Based Compensation Expense Recognized for All ISOs, Restricted Stock and Stock Bonus Awards (Parenthetical) (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Benefit for income taxes from equity-based compensation	$0	$0
Without Valuation Allowance [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Benefit for income taxes from equity-based compensation	$231,000	$119,000

EquityBased_Compensation_Assum

Equity-Based Compensation - Assumptions for Fair Value of ISOs Estimated on the Date of Grant Using the Black-Scholes Option (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
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 years	6 years

EquityBased_Compensation_Summa2

Equity-Based Compensation - Summary of Activity for ISOs (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Number of ISOs, outstanding, Beginning Balance	173,333
Number of ISOs, granted	62,000	180,000
Number of ISOs, exercised	-18,529
Number of ISOs, forfeited	-1,667	-6,667
Number of ISOs, outstanding, Ending Balance	215,137	173,333
Number of ISOs, exercisable	39,804
Number of ISOs, expected to vest, net of forfeitures	166,638	164,852
Weighted Average Exercise Price, Beginning Balance	$18
Weighted Average Exercise Price, ISOs granted	$15.74	$18
Weighted Average Exercise Price, ISOs exercised	$18
Weighted Average Exercise Price, ISOs forfeited	$18	$18
Weighted Average Exercise Price, Ending Balance	$17.35	$18
Weighted Average Exercise Price, ISOs exercisable	$18
Weighted Average Exercise Price, ISOs expected to vest, net of forfeitures	$17.21	$18
Weighted Average Grant Date Fair Value, Beginning Balance	$11.03
Weighted Average Grant Date Fair Value, ISOs granted	$9.60	$11.03
Weighted Average Grant Date Fair Value, ISOs exercised	$11.03
Weighted Average Grant Date Fair Value, ISOs forfeited	$11.03	$11.03
Weighted Average Grant Date Fair Value, Ending Balance	$10.62	$11.03
Weighted Average Grant Date Fair Value, ISOs exercisable	$11.03
Weighted Average Grant Date Fair Value, ISOs expected to vest, net of forfeitures	$10.53	$11.03

EquityBased_Compensation_Summa3

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

EquityBased_Compensation_Summa4

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

Income_Taxes_Additional_Inform

Income Taxes - Additional Information (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Jan. 01, 2013	Dec. 31, 2011
Schedule Of Income Taxes [Line Items]
Deferred tax assets, net	$471	$548		$410
Percentage of valuation allowance of initial net deferred tax asset		100.00%
Net operating loss carryforwards	54
U.S. statutory rate	34.00%	34.00%	34.00%
Increase to allowances		410
Liability for uncertain tax positions	871	768	416		264
Germany [Member]
Schedule Of Income Taxes [Line Items]
Liability for uncertain tax positions	195
Subsidiaries [Member] | Japan [Member]
Schedule Of Income Taxes [Line Items]
Liability for uncertain tax positions	159	93
Subsidiaries [Member] | 2033 [Member] | United States [Member]
Schedule Of Income Taxes [Line Items]
Net operating loss carryforwards	3,976
Expiration period of net operating loss carryforwards	2033
Tax credit carryforwards	765
Expiration period of tax credit carryforwards	2023
Subsidiaries [Member] | 2033 [Member] | Japan [Member]
Schedule Of Income Taxes [Line Items]
Net operating loss carryforwards	2,045
Subsidiaries [Member] | 2033 [Member] | Germany And Italy [Member]
Schedule Of Income Taxes [Line Items]
Net operating loss carryforwards	4,214
Subsidiaries [Member] | 2034 [Member] | United States [Member]
Schedule Of Income Taxes [Line Items]
Net operating loss carryforwards	$13,429
Expiration period of net operating loss carryforwards	2034
Subsidiaries [Member] | Earliest Tax Year [Member] | Japan [Member]
Schedule Of Income Taxes [Line Items]
Expiration period of net operating loss carryforwards	2015
Subsidiaries [Member] | Latest Tax Year [Member] | Japan [Member]
Schedule Of Income Taxes [Line Items]
Expiration period of net operating loss carryforwards	2023

Income_Taxes_Schedule_of_Loss_

Income Taxes - Schedule of Loss Before Tax (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
United States	($15,683)	($9,675)	($12,634)
Foreign	-6,001	3,728	3,941
Loss before income taxes	($21,684)	($5,947)	($8,693)

Income_Taxes_Summary_of_Income

Income Taxes - Summary of IncomeTax Expense Benefit (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
United States	$0	$0	$0
Foreign	290	370	995
Provision (benefit) for income taxes	290	370	995
United States	20
Foreign	-151
Provision (benefit) for income taxes	-131
United States	20
Foreign	139	370	995
Provision (benefit) for income taxes	$159	$370	$995	[1]
[1]	Information not comparable for 2012 as a result of the Reorganization of the Company as a corporation on January 1, 2013 (Note 1).

Income_Taxes_Reconciliation_of

Income Taxes - Reconciliation of the Provision for Income Taxes (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
U.S. statutory rate (34.0%)	($7,373)	($2,022)	($2,956)
Unbenefitted limited liability company losses			3,931
Taxes on foreign operations	-154	-95	-164
Increase in uncertain tax positions	210	323	146
Net change in valuation allowances	6,980	2,029	8
Permanent differences and other	496	135	30
Provision (benefit) for income taxes	$159	$370	$995	[1]
Effective tax rate	-0.70%	-6.20%	-11.50%
[1]	Information not comparable for 2012 as a result of the Reorganization of the Company as a corporation on January 1, 2013 (Note 1).

Income_Taxes_Reconciliation_of1

Income Taxes - Reconciliation of the Provision for Income Taxes (Parenthetical) (Detail)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
U.S. statutory rate	34.00%	34.00%	34.00%

Income_Taxes_Components_of_Net

Income Taxes - Components of Net Deferred Income Tax Assets and Net Deferred Income Tax Liabilities (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Jan. 01, 2013
In Thousands, unless otherwise specified
Deferred tax assets
Accounts receivable	$836	$23
Inventories	300	452
Property and equipment	403	820
Accrued expenses and other current liabilities	849	591
Net operating loss carryforwards	7,375	2,694
Tax credit carryforwards	765	874
Other	1,012	266
Valuation allowance	-11,069	-5,172
Total deferred tax assets	471	548	410
Deferred tax liabilities
Other	-794	-548
Total deferred tax liabilities	-794	-548
Net deferred tax liabilities	($323)

Income_Taxes_Summary_of_Change

Income Taxes - Summary of Changes to Valuation Allowances (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Beginning balance	$5,172	$3,468
Increase to allowances	6,980	2,029
Foreign currency translation and other adjustments	-1,083	-325
Ending balance	$11,069	$5,172

Income_Taxes_Reconciliation_of2

Income Taxes - Reconciliation of Unrecognized Tax Benefits (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Beginning balance	$768	$416	$264
Increases related to current year tax positions	210	323	146
Foreign currency translation adjustments	-107	29	6
Ending balance	$871	$768	$416

Income_Taxes_Summary_of_Tax_Ye

Income Taxes - Summary of Tax Year Subject to Examinations (Detail)	12 Months Ended
	Dec. 31, 2014
Earliest Tax Year [Member] | United States [Member]
Income Tax Contingency [Line Items]
Tax year subject to examination	2013
Earliest Tax Year [Member] | Germany [Member]
Income Tax Contingency [Line Items]
Tax year subject to examination	2011
Earliest Tax Year [Member] | Italy [Member]
Income Tax Contingency [Line Items]
Tax year subject to examination	2014
Earliest Tax Year [Member] | Japan [Member]
Income Tax Contingency [Line Items]
Tax year subject to examination	2005
Latest Tax Year [Member] | United States [Member]
Income Tax Contingency [Line Items]
Tax year subject to examination	2014
Latest Tax Year [Member] | Germany [Member]
Income Tax Contingency [Line Items]
Tax year subject to examination	2014
Latest Tax Year [Member] | Japan [Member]
Income Tax Contingency [Line Items]
Tax year subject to examination	2014

Fair_Value_Measurements_Fair_V

Fair Value Measurements - Fair Value of Liabilities Measured on Recurring Basis (Detail) (Fair Value, Inputs, Level 3 [Member], USD $)	Dec. 31, 2014
In Thousands, unless otherwise specified
Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Accrued expenses and other current liabilities, MAM contingent consideration	$190

Fair_Value_Measurements_Minimu

Fair Value Measurements - Minimum Achievement of Revenues and Gross Profit (Detail) (USD $)	3 Months Ended								12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Schedule Of Earn Out Of Required Minimum Achievement Of Revenues And Gross Profit [Line Items]
Revenue	$15,765	$9,649	$11,201	$7,285	$10,695	$11,621	$9,230	$7,934	$43,900	$39,480	$28,657
Gross profit	3,855	2,487	2,496	1,619	3,303	5,251	4,181	2,838	10,457	15,573	12,143
Earn Out Provision 2014 [Member] | Minimum [Member]
Schedule Of Earn Out Of Required Minimum Achievement Of Revenues And Gross Profit [Line Items]
Revenue									2,490
Gross profit									623
Earn Out Provision 2015 [Member] | Minimum [Member]
Schedule Of Earn Out Of Required Minimum Achievement Of Revenues And Gross Profit [Line Items]
Revenue									3,500
Gross profit									$875

Fair_Value_Measurements_Minimu1

Fair Value Measurements - Minimum Achievement of Revenues and Gross Profit (Parenthetical) (Detail) (MAM Corporation [Member])	12 Months Ended
	Dec. 31, 2014
MAM Corporation [Member]
Schedule Of Earn Out Of Required Minimum Achievement Of Revenues And Gross Profit [Line Items]
Date of acquisition	3-Mar-14

Fair_Value_Measurements_Additi

Fair Value Measurements - Additional Information (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014
Fair Value Measurements Disclosure [Line Items]
Changes in fair value of contingent consideration	($185)
MAM Corporation [Member]
Fair Value Measurements Disclosure [Line Items]
Changes in fair value of contingent consideration	185
MAM Corporation [Member] | Selling, General and Administrative Expenses [Member]
Fair Value Measurements Disclosure [Line Items]
Revisions of estimates of revenue and gross profit	195
Impact of discounting future cash payments on the associated liabilities	$10

Fair_Value_Measurements_Summar

Fair Value Measurements - Summary of Changes in Fair Value of Company's Level 3 Financial Instruments (Detail) (Fair Value, Inputs, Level 3 [Member], USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Fair Value, Inputs, Level 3 [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Purchases	$0	$0
Sales	0	0
Issuances	375
Settlements	0	0
Realized (gains) losses	-195
Unrealized (gains) losses	10
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Ending balance	$190

Fair_Value_Measurements_Carryi

Fair Value Measurements - Carrying Values and Fair Values of Other Financial Instruments (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
In Thousands, unless otherwise specified
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	$36,202	$98,445	$2,802	$3,496
Current portion of long-term debt	132	127
Current portion of capital and financing leases	346	549
Long-term debt - net of current portion	1,950	2,082
Capital and financing leases - net of current portion	164	475
Carrying Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	36,202	98,445
Current portion of long-term debt	132	127
Current portion of capital and financing leases	346	549
Long-term debt - net of current portion	1,950	2,082
Capital and financing leases - net of current portion	164	475
Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	36,202	98,445
Current portion of long-term debt	132	127
Current portion of capital and financing leases	346	549
Long-term debt - net of current portion	2,022	1,666
Capital and financing leases - net of current portion	$164	$475

Customer_Concentrations_Additi

Customer Concentrations - Additional Information (Detail) (Five Most Significant Customers [Member], USD $)	0 Months Ended		12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
	Customer	Customer	Customer	Customer	Customer
Revenue, Major Customer [Line Items]
Accounts receivable from significant customers	6,326	5,912	6,326	5,912
Sales Revenue, Net [Member]
Revenue, Major Customer [Line Items]
Number of customers	5	5	5	5	5
Customer Concentration Risk [Member] | Sales Revenue, Net [Member]
Revenue, Major Customer [Line Items]
Revenue concentration, by most significant customers			23.10%	25.50%	31.70%

Related_Party_Transactions_Add

Related Party Transactions - Additional Information (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Schedule of Other Related Party Transactions [Line Items]
Revenue		$133	$281
Payments for services received from related parties	90	185	149
Consulting [Member] | Hans J. Sack [Member]
Schedule of Other Related Party Transactions [Line Items]
Consulting arrangement consideration amount	75
Consulting [Member] | Hans J. Sack [Member] | Selling, General and Administrative Expenses [Member]
Schedule of Other Related Party Transactions [Line Items]
Consulting arrangement consideration amount	25
3D Printing Machines [Member]
Schedule of Other Related Party Transactions [Line Items]
Consideration for printing machine	1,000
Revenue	$815

Segment_Product_and_Geographic2

Segment, Product and Geographic Information - Revenue by Product (Detail) (USD $)	3 Months Ended								12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Revenue from External Customer [Line Items]
Revenues	$15,765	$9,649	$11,201	$7,285	$10,695	$11,621	$9,230	$7,934	$43,900	$39,480	$28,657
3D Printing Machines [Member]
Revenue from External Customer [Line Items]
Revenues									22,792	24,851	15,668
3D Printed and Other Products, Materials and Services [Member]
Revenue from External Customer [Line Items]
Revenues									$21,108	$14,629	$12,989

Segment_Product_and_Geographic3

Segment, Product and Geographic Information - Geographic Information for Revenue (Detail) (USD $)	3 Months Ended								12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	$15,765	$9,649	$11,201	$7,285	$10,695	$11,621	$9,230	$7,934	$43,900	$39,480	$28,657
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									21,115	14,596	7,802
Germany [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									18,118	14,744	13,956
Japan [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									4,623	10,140	6,899
Italy [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									$44

Segment_Product_and_Geographic4

Segment, Product and Geographic Information - Geographic Information for Long-Lived Assets (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	$55,298	$32,772
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	20,334	13,257
Germany [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	28,522	18,219
Japan [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	4,978	1,296
Italy [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	$1,464

Subsequent_Events_Additional_I

Subsequent Events - Additional Information (Detail)	12 Months Ended		0 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Mar. 16, 2015	Feb. 06, 2015
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Shares authorized	67,500	20,000
Subsequent Event [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards vest increment			These awards vest in one-third increments on the first, second and third anniversaries of the date of grant	These awards vest on the one year anniversary of the date of grant.
Subsequent Event [Member] | Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Shares authorized			5,000	17,500

Supplemental_Quarterly_Financi2

Supplemental Quarterly Financial Information - Summary of Supplemental Quarterly Financial Information (Detail) (USD $)	3 Months Ended								12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Quarterly Financial Information Disclosure [Abstract]
Revenue	$15,765	$9,649	$11,201	$7,285	$10,695	$11,621	$9,230	$7,934	$43,900	$39,480	$28,657
Gross profit	3,855	2,487	2,496	1,619	3,303	5,251	4,181	2,838	10,457	15,573	12,143
Net loss attributable to ExOne	($7,200)	($4,451)	($4,665)	($5,527)	($3,197)	($224)	($1,120)	($1,914)	($21,843)	($6,455)	($10,168)
Net loss attributable to ExOne per common share*:
Basic	($0.50)	($0.31)	($0.32)	($0.38)	($0.22)	($0.02)	($0.08)	($0.20)	($1.52)	($0.51)		[1]
Diluted	($0.50)	($0.31)	($0.32)	($0.38)	($0.22)	($0.02)	($0.08)	($0.20)	($1.52)	($0.51)		[1]
[1]	Information not comparable for 2012 as a result of the Reorganization of the Company as a corporation on January 1, 2013 (Note 1).