ExOne (XONE) 10-Q 12 Jun 15 2015 Q1 Quarterly report Financial data

Document_and_Entity_Informatio

Document and Entity Information	3 Months Ended
	Mar. 31, 2015	Jun. 12, 2015
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	FALSE
Document Period End Date	31-Mar-15
Document Fiscal Year Focus	2015
Document Fiscal Period Focus	Q1
Trading Symbol	XONE
Entity Registrant Name	ExOne Co
Entity Central Index Key	1561627
Current Fiscal Year End Date	-19
Entity Filer Category	Accelerated Filer
Entity Common Stock, Shares Outstanding		14,521,137

Condensed_Statement_of_Consoli

Condensed Statement of Consolidated Operations and Comprehensive Loss (USD $)	3 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Income Statement [Abstract]
Revenue	$6,793	$7,285
Cost of sales	6,793	5,666
Gross profit		1,619
Operating expenses
Research and development	1,734	1,844
Selling, general and administrative	6,118	5,201
Total operating expenses	7,852	7,045
Loss from operations	-7,852	-5,426
Other (income) expense
Interest expense	28	29
Other income - net	-150	-92
Total other (income) expense	-122	-63
Loss before income taxes	-7,730	-5,363
(Benefit) provision for income taxes	-59	164
Net loss	-7,671	-5,527
Net loss per common share:
Basic	($0.53)	($0.38)
Diluted	($0.53)	($0.38)
Comprehensive loss:
Net loss	-7,671	-5,527
Other comprehensive (loss) income:
Foreign currency translation adjustments	-5,348	112
Comprehensive loss	($13,019)	($5,415)

Condensed_Consolidated_Balance

Condensed Consolidated Balance Sheet (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Current assets:
Cash and cash equivalents	$30,101	$36,202
Accounts receivable - net of allowance of $2,139 (2015) and $2,431 (2014)	10,221	14,238
Inventories - net	17,759	17,014
Prepaid expenses and other current assets	3,993	3,138
Total current assets	62,074	70,592
Property and equipment - net	54,250	55,298
Goodwill	4,316	4,665
Other noncurrent assets	2,337	2,875
Total assets	122,977	133,430
Current liabilities:
Current portion of long-term debt	134	132
Current portion of capital and financing leases	216	346
Accounts payable	3,897	2,553
Accrued expenses and other current liabilities	7,941	8,424
Deferred revenue and customer prepayments	2,592	902
Total current liabilities	14,780	12,357
Long-term debt - net of current portion	1,916	1,950
Capital and financing leases - net of current portion	144	164
Other noncurrent liabilities	208	414
Total liabilities	17,048	14,885
Contingencies and commitments
Stockholders' equity
Common stock, $0.01 par value, 200,000,000 shares authorized, 14,428,634 (2015) and 14,417,803 (2014) shares issued and outstanding	144	144
Additional paid-in capital	155,305	154,902
Accumulated deficit	-35,969	-28,298
Accumulated other comprehensive loss	-13,551	-8,203
Total stockholders' equity	105,929	118,545
Total liabilities and stockholders' equity	$122,977	$133,430

Condensed_Consolidated_Balance1

Condensed Consolidated Balance Sheet (Parenthetical) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, except Share data, unless otherwise specified
Statement of Financial Position [Abstract]
Allowance for accounts receivable	$2,139	$2,431
Common stock, par value	$0.01	$0.01
Common stock, shares authorized	200,000,000	200,000,000
Common stock, shares issued	14,428,634	14,417,803
Common stock, shares outstanding	14,428,634	14,417,803

Condensed_Statement_of_Consoli1

Condensed Statement of Consolidated Cash Flows (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Operating activities
Net loss	($7,671)	($5,527)
Adjustments to reconcile net loss to cash used for operations:
Depreciation and amortization	1,218	733
Deferred income taxes	-79
Equity-based compensation	403	440
Provision for bad debts	-128	21
Changes in fair value of contingent consideration	3
Changes in assets and liabilities, excluding effects of acquisitions and foreign currency translation adjustments:
Decrease (increase) in accounts receivable	2,628	-147
Increase in inventories	-1,916	-3,811
(Increase) decrease in prepaid expenses and other assets	-489	311
Increase in accounts payable	1,267	1,213
Decrease in accrued expenses and other liabilities	-328	-91
Increase in deferred revenue and customer prepayments	996	532
Cash used for operating activities	-4,096	-6,326
Investing activities
Capital expenditures	-1,769	-5,141
Acquisitions, net of cash acquired of $201		-9,230
Cash used for investing activities	-1,769	-14,371
Financing activities
Proceeds from exercise of employee stock options		318
Payments on long-term debt	-32	-369
Payments on capital and financing leases	-125	-134
Cash used for financing activities	-157	-185
Effect of exchange rate changes on cash and cash equivalents	-79	27
Net change in cash and cash equivalents	-6,101	-20,855
Cash and cash equivalents at beginning of period	36,202	98,445
Cash and cash equivalents at end of period	30,101	77,590
Supplemental disclosure of noncash investing and financing activities
Property and equipment included in accounts payable	13	556
Transfer of inventories to property and equipment for internal use	2,506	1,524
Net assets acquired through acquisitions, net of cash acquired of $201		9,685
Noncash consideration for acquisitions		$455

Condensed_Statement_of_Consoli2

Condensed Statement of Consolidated Cash Flows (Parenthetical) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015
Statement of Cash Flows [Abstract]
Cash acquired from acquisitions	$201

Condensed_Statement_of_Changes

Condensed Statement of Changes in Consolidated Stockholders' Equity (USD $)	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Deficit [Member]	Accumulated Other Comprehensive Loss [Member]
In Thousands
Beginning Balance at Dec. 31, 2013	$146,700	$144	$153,363	($6,455)	($352)
Beginning Balance, Shares at Dec. 31, 2013		14,387
Net loss	-5,527			-5,527
Other comprehensive income (loss)	112				112
Equity-based compensation	440		440
Common stock issued from equity incentive plan	318		318
Common stock issued from equity incentive plan, shares		30
Ending Balance at Mar. 31, 2014	142,043	144	154,121	-11,982	-240
Ending Balance, Shares at Mar. 31, 2014		14,417
Beginning Balance at Dec. 31, 2014	118,545	144	154,902	-28,298	-8,203
Beginning Balance, Shares at Dec. 31, 2014		14,417
Net loss	-7,671			-7,671
Other comprehensive income (loss)	-5,348				-5,348
Equity-based compensation	403		403
Common stock issued from equity incentive plan, shares		11
Ending Balance at Mar. 31, 2015	$105,929	$144	$155,305	($35,969)	($13,551)
Ending Balance, Shares at Mar. 31, 2015		14,428

Basis_of_Presentation_and_Prin

Basis of Presentation and Principles of Consolidation	3 Months Ended
	Mar. 31, 2015
Accounting Policies [Abstract]
Basis of Presentation and Principles of Consolidation	Note 1. Basis of Presentation and Principles of Consolidation
	Organization
	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 condensed consolidated financial statements include the accounts of ExOne, its wholly-owned subsidiaries, ExOne Americas LLC (United States), ExOne GmbH (Germany), ExOne Property GmbH (Germany), ExOne KK (Japan); effective in March 2014, MWT—Gesellschaft für Industrielle Mikrowellentechnik mbH (Germany); and effective in May 2014, ExOne Italy S.r.l (Italy). Collectively, the consolidated group is referred to as the “Company”.
	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 condensed consolidated financial statements of the Company are unaudited. The condensed consolidated financial statements include all adjustments, consisting of normal recurring adjustments, considered necessary by management to fairly state the results of operations, financial position and cash flows of the Company. All material intercompany transactions and balances have been eliminated in consolidation. The results reported in these condensed consolidated financial statements are not necessarily indicative of the results that may be expected for the entire year. The December 31, 2014 condensed consolidated balance sheet data was derived from the audited financial statements but does not include all disclosures required by accounting principles generally accepted in the United States of America (“GAAP”). This Quarterly Report on Form 10-Q should be read in connection with the Company’s Annual Report on Form 10-K for the year ended December 31, 2014, which includes all disclosures required by GAAP.
	Liquidity
	The Company has incurred net losses in each of its annual periods since its inception. As shown in the accompanying condensed consolidated financial statements, the Company incurred a net loss of approximately $7,671 for the quarter ended March 31, 2015. 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 and secondary public offering in 2013, the Company received 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 April 1, 2016.
	The Company has additionally considered the impact of continued operating losses and cash flow deficiencies on the carrying value of goodwill and long-lived assets held and used by the Company. Based on the assessment completed by management, no impairment loss has been recorded by the Company during the quarter ended March 31, 2015. Assessing the recoverability of goodwill and long-lived assets held for use requires significant judgments and estimates by management. A deterioration in general economic conditions, negative developments in equity and credit markets, a significant decline in the Company’s market capitalization, adverse changes in the markets in which the Company 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 other indicators, could cause a future assessment to be performed which may result in an impairment of goodwill, long-lived assets held for use, or both, resulting in an material adverse effect on the financial position and results of operations of the Company.
	Recently Adopted Accounting Guidance
	On January 1, 2015, the Company adopted Financial Accounting Standards Board (“FASB”) guidance clarifying the presentation of unrecognized tax benefits when a net operating loss carryforward, or similar tax loss or a tax credit carryforward exists. The amendment requires that unrecognized tax benefits be presented in the consolidated financial statements as a reduction to a deferred tax asset for a net operating loss carryforward, a similar tax loss, or a tax credit carryforward, unless certain exceptions exist. Previously, there was diversity in practice as no explicit guidance existed. As the Company had previously followed the now required presentation, the adoption of this guidance did not have a material impact on the consolidated financial statements of the Company.
	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 April 2015, the FASB issued changes to the presentation of debt issuance costs in financial statements. These changes require an entity to present such costs in the balance sheet as a direct deduction from the related debt liability rather than as an asset. Amortization of the costs will continue to be reported as interest expense. These changes become effective for the Company on December 31, 2016, or March 31, 2016, in the event that the Company no longer qualifies as an emerging growth company in accordance with the JOBS Act. Early adoption is permitted. The new guidance will be applied retrospectively to each prior period presented. Management is currently evaluating the potential impact of these changes on the consolidated financial statements of the Company.

Accumulated_Other_Comprehensiv

Accumulated Other Comprehensive Loss	3 Months Ended
	Mar. 31, 2015
Equity [Abstract]
Accumulated Other Comprehensive Loss	Note 2. Accumulated Other Comprehensive Loss
	The following table summarizes changes in the components of accumulated other comprehensive loss:
		Quarter Ended
		March 31,
	Foreign currency translation adjustments	2015			2014
	Balance at beginning of period	$	(8,203	)	$	(352	)
	Other comprehensive (loss) income		(5,348	)		112
	Balance at end of period	$	(13,551	)	$	(240	)
	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 between subsidiaries for which settlement is not planned or anticipated.
	There were no tax impacts related to income tax rate changes and no amounts were reclassified to earnings for either of the periods presented.

Earnings_Per_Share

Earnings Per Share	3 Months Ended
	Mar. 31, 2015
Earnings Per Share [Abstract]
Earnings Per Share	Note 3. Earnings Per Share
	The Company presents basic and diluted net loss per common share amounts. Basic net loss per share is calculated by dividing net loss available to common shareholders by the weighted average number of common shares outstanding during the applicable period. Diluted net loss per share is calculated by dividing net loss available to common shareholders by the weighted average number of common shares and common equivalent shares outstanding during the applicable period.
	As the Company incurred a net loss during each of the quarters ended March 31, 2015 and 2014, 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 (207,803 – 2015 and 155,637 – 2014) and unvested restricted stock issued (92,503 – 2015 and 25,834 – 2014), was anti-dilutive.
	The information used to compute basic and diluted net loss per common share was as follows:
		Quarter Ended
		March 31,
		2015			2014
	Net loss	$	(7,671	)	$	(5,527	)
	Weighted average shares outstanding (basic and diluted)		14,423,237			14,392,403
	Net loss per common share:
	Basic	$	(0.53	)	$	(0.38	)
	Diluted	$	(0.53	)	$	(0.38	)

Inventories

Inventories	3 Months Ended
	Mar. 31, 2015
Inventory Disclosure [Abstract]
Inventories	Note 4. Inventories
	Inventories consist of the following:
		March 31,		December 31,
		2015		2014
	Raw materials and components	$	10,775	$	10,838
	Work in process		4,466		4,221
	Finished goods		2,518		1,955
		$	17,759	$	17,014
	Raw materials and components consist of (i) consumable materials and (ii) component parts and subassemblies associated with 3D printing machine manufacturing and support activities. Work in process consists of 3D printing machines and other products in varying stages of completion. Finished goods consist of 3D printing machines and other products prepared for delivery in accordance with customer specifications.
	At March 31, 2015 and December 31, 2014, the allowance for slow-moving and obsolete inventories was approximately $1,165 and $1,241, respectively, and has been reflected as a reduction to inventories (principally raw materials and components). Included in the allowance for slow-moving and obsolete inventories at March 31, 2015 and December 31, 2014, is approximately $406 and $419, respectively, associated with the Company’s laser micromachining product line which was discontinued at the end of 2014.

Contingencies_and_Commitments

Contingencies and Commitments	3 Months Ended
	Mar. 31, 2015
Commitments and Contingencies Disclosure [Abstract]
Contingencies and Commitments	Note 5. 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	3 Months Ended
	Mar. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Equity-Based Compensation	Note 6. Equity-Based Compensation
	On January 24, 2013, the Board of Directors of the Company adopted the 2013 Equity Incentive Plan (the “Plan”). In connection with the adoption of the Plan, 500,000 shares of common stock were reserved for issuance pursuant to the Plan, with automatic increases in such reserve available each year annually on January 1 from 2014 through 2023 equal to the lesser of (i) 3.0% of the total outstanding shares of common stock as of December 31 of the immediately preceding year or (ii) a number of shares of common stock determined by the Board of Directors, provided that the maximum number of shares authorized under the Plan will not exceed 1,992,242 shares, subject to certain adjustments.
	The following table summarizes the total equity-based compensation expense recognized for awards issued under the Plan:
			Quarter Ended
			March 31,
			2015			2014
	Equity-based compensation expense recognized:
	Incentive stock options		$	195		$	160
	Restricted stock			208			83
	Stock bonus awards			—			197
	Total equity-based compensation expense before income taxes			403			440
	Benefit for income taxes*			—			—
	Total equity-based compensation expense net of income taxes		$	403		$	440
	*	The benefit for income taxes from equity-based compensation for each of the periods presented has been determined to be $0 based on valuation allowances against net deferred tax assets.
	At March 31, 2015, total future compensation expense related to unvested awards yet to be recognized by the Company was approximately $1,002 for incentive stock options (“ISOs”) and $1,601 for restricted stock awards. Total future compensation expense related to unvested awards yet to be recognized by the Company is expected to be recognized over a weighted-average remaining vesting period of approximately 1.9 years.
	The activity for ISOs for the quarter ended March 31, 2015, was as follows:
			Number of			Weighted		Weighted
			ISOs			Average Exercise		Average Grant
						Price		Date Fair Value
	Outstanding at December 31, 2014			215,137		$	17.35	$	10.62
	ISOs granted			—		$	—	$	—
	ISOs exercised			—		$	—	$	—
	ISOs forfeited			(7,334	)	$	17.54	$	11.03
	Outstanding at March 31, 2015			207,803		$	17.34	$	10.61
	ISOs exercisable at March 31, 2015			96,472		$	18	$	11.03
	ISOs expected to vest at March 31, 2015			106,248		$	16.79	$	10.26
	At March 31, 2015, there was no intrinsic value associated with ISOs exercisable or ISOs expected to vest. The weighted average remaining contractual term of ISOs both exercisable and expected to vest at March 31, 2015, was approximately 6.8 years. ISOs with an aggregate intrinsic value of approximately $306 were exercised by employees during the quarter ended March 31, 2014, resulting in proceeds to the Company from the exercise of stock options of approximately $318. The Company received no income tax benefit related to these exercises. There were no exercises during the quarter ended March 31, 2015.
	The activity for restricted stock awards for the quarter ended March 31, 2015, was as follows:
			Shares of			Weighted
			Restricted Stock			Average Grant
						Date Fair Value
	Outstanding at December 31, 2014			80,834		$	22.78
	Restricted shares granted			22,500		$	14.17
	Restricted shares vested*			(10,831	)	$	34.8
	Restricted shares forfeited			—		$	—
	Outstanding at March 31, 2015			92,503		$	19.28
	Restricted shares expected to vest at December 31, 2015			92,503		$	19.28
	*	Restricted shares vesting during the quarter ended March 31, 2015, had a fair value of approximately $158.

Income_Taxes

Income Taxes	3 Months Ended
	Mar. 31, 2015
Income Tax Disclosure [Abstract]
Income Taxes	Note 7. Income Taxes
	The (benefit) provision for income taxes for the quarters ended March 31, 2015 and 2014 was ($59) and $164, respectively. The Company has completed a discrete period computation of its (benefit) provision for income taxes for each of the periods presented. Discrete period computation is as a result of (i) jurisdictions with losses before income taxes for which no tax benefit can be recognized and (ii) an inability to generate reliable estimates for results in certain jurisdictions as a result of inconsistencies in generating net operating profits (losses) in those jurisdictions.
	The effective tax rate for the quarters ended March 31, 2015 and 2014 was 0.8% (benefit on a loss) and 3.1% (provision on a loss), respectively. The effective tax rate differs from the U.S. federal statutory rate of 34.0% for each of the periods presented primarily due to net changes in valuation allowances for the periods.
	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 in jurisdictions with which it operates. As such, any benefit from deferred taxes in either quarterly period 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 Company has a liability for uncertain tax positions related to certain capitalized expenses and intercompany transactions. At March 31, 2015 and December 31, 2014, the liability for uncertain tax positions was approximately $777 and $871, respectively, and is included in accrued expenses and other current liabilities in the condensed consolidated balance sheet. In addition, at March 31, 2015 and 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 $437 and $354, respectively, which were fully offset against net operating loss carryforwards of the respective subsidiaries.

Fair_Value_Measurements

Fair Value Measurements	3 Months Ended
	Mar. 31, 2015
Fair Value Disclosures [Abstract]
Fair Value Measurements	Note 8. 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; and
		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		March 31,		December 31,
				2015		2014
	Accrued expenses and other current liabilities:
	Contingent consideration		3	$	193	$	190
	The fair value of contingent consideration associated with the 2014 acquisition of Machin-A-Mation Corporation (“MAM”) 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 ($3,500) and gross profit ($875) for the year ended December 31, 2015.
	During the quarter ended March 31, 2015, the Company recorded changes in the fair value of contingent consideration issued in connection with the acquisition of MAM of approximately $3, with a corresponding amount recorded to selling, general and administrative expenses. Changes in contingent consideration recorded by the Company during the quarter ended March 31, 2015 are based on the impact of discounting future cash payments on the associated liabilities.
	The following table sets forth a summary of changes in the fair value of the Company’s Level 3 financial instruments:
		Quarter Ended
		March 31,
		2015		2014
	Beginning balance	$	190	$	—
	Purchases		—		—
	Sales		—		—
	Issuances		—		377
	Settlements		—		—
	Realized (gains) losses		—		—
	Unrealized (gains) losses		3		—
	Transfers into Level 3		—		—
	Transfers out of Level 3		—		—
	Ending balance	$	193	$	377
	The carrying values and fair values of other financial instruments (assets and liabilities) not required to be recorded at fair value were as follows:
		March 31,				December 31,
		2015				2014
		Carrying		Fair		Carrying		Fair
		Value		Value		Value		Value
	Cash and cash equivalents	$	30,101	$	30,101	$	36,202	$	36,202
	Current portion of long-term debt	$	134	$	134	$	132	$	132
	Current portion of capital and financing leases	$	216	$	216	$	346	$	346
	Long-term debt - net of current portion	$	1,916	$	1,894	$	1,950	$	2,022
	Capital and financing leases - net of current portion	$	144	$	144	$	164	$	164
	The carrying amounts of cash and cash equivalents, current portion of long-term debt and current portion of capital and financing leases approximate fair value due to their short-term maturities. Cash and cash equivalents are classified in Level 1; current portion of long-term debt, current portion of capital and financing leases, long-term debt – net of current portion and capital and financing leases – net of current portion are classified in Level 2.

Customer_Concentrations

Customer Concentrations	3 Months Ended
	Mar. 31, 2015
Risks and Uncertainties [Abstract]
Customer Concentrations	Note 9. Customer Concentrations
	During the quarters ended March 31, 2015 and 2014, the Company conducted a significant portion of its business with a limited number of customers. For the quarters ended March 31, 2015 and 2014, the Company’s five most significant customers represented approximately 23.5% and 39.0% of total revenue, respectively. At March 31, 2015 and December 31, 2014, accounts receivable from the Company’s five most significant customers were approximately $4,653 and $6,326, respectively.

Related_Party_Transactions

Related Party Transactions	3 Months Ended
	Mar. 31, 2015
Related Party Transactions [Abstract]
Related Party Transactions	Note 10. 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 a fair market value selling price (based on comparable 3D printing machine sales to third parties) and was approved prior to execution by the Audit Committee of the Board of Directors of the Company. The Company recorded revenue of approximately $815 on this transaction during 2014. At March 31, 2015, the Company continued to defer the remaining consideration covered under this transaction (approximately $185) as certain products and/or services remained undelivered by the Company. All of the proceeds associated with this transaction have been received by the Company at March 31, 2015. In March 2015, the Company entered into a separate sale agreement for a 3D printing machine with the same related entity under common control by the Chairman and CEO of the Company. Total consideration for the 3D printing machine (approximately $950) was determined to represent a fair market value selling price (based on comparable 3D printing machine sales to third parties) and was approved prior to execution by the Audit Committee of the Board of Directors of the Company. At March 31, 2015, the Company deferred the full consideration covered under this transaction as certain criteria necessary to recognize revenue on this transaction were not met. All of the proceeds associated with this transaction have been received by the Company at March 31, 2015.
	Additional sales of products and/or services to related entities, both individually and in the aggregate, during the quarters ended March 31, 2015 and 2014 were not significant.
	Amounts due from related entities at March 31, 2015 and December 31, 2014, 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 was approximately $75, of which approximately $50 was included in selling, general and administrative expenses in the statement of consolidated operations and comprehensive loss for the quarter ended March 31, 2015, based on the services rendered (the remaining amount having been recorded by the Company during the quarter ended December 31, 2014). In connection with his appointment to the Board of Directors of the Company the Audit Committee of the Board of Directors of the Company approved this arrangement under company policy for related party transactions. In March 2015, Hans J. Sack resigned from the Board of Directors to accept a position as President of the Company.
	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 were not significant to the Company during the quarters ended March 31, 2015 and 2014. None of the transactions met a threshold requiring review and approval by the Board of Directors of the Company. The Company also receives the benefit of the corporate use of an airplane from a related party under common control by the Chairman and CEO of the Company for no consideration. The value of this benefit during the quarters ended March 31, 2015 and 2014 was not significant to the Company.
	Amounts due to related entities at March 31, 2015 and December 31, 2014, were not significant.

Subsequent_Events

Subsequent Events	3 Months Ended
	Mar. 31, 2015
Subsequent Events [Abstract]
Subsequent Events	Note 11. Subsequent Events
	The Company has evaluated all of its activities and concluded that no subsequent events have occurred that would require recognition in the condensed consolidated financial statements or disclosure in the notes to the condensed consolidated financial statements.

Basis_of_Presentation_and_Prin1

Basis of Presentation and Principles of Consolidation (Policies)	3 Months Ended
	Mar. 31, 2015
Accounting Policies [Abstract]
Organization	Organization
	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 condensed consolidated financial statements include the accounts of ExOne, its wholly-owned subsidiaries, ExOne Americas LLC (United States), ExOne GmbH (Germany), ExOne Property GmbH (Germany), ExOne KK (Japan); effective in March 2014, MWT—Gesellschaft für Industrielle Mikrowellentechnik mbH (Germany); and effective in May 2014, ExOne Italy S.r.l (Italy). Collectively, the consolidated group is referred to as the “Company”.
	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 condensed consolidated financial statements of the Company are unaudited. The condensed consolidated financial statements include all adjustments, consisting of normal recurring adjustments, considered necessary by management to fairly state the results of operations, financial position and cash flows of the Company. All material intercompany transactions and balances have been eliminated in consolidation. The results reported in these condensed consolidated financial statements are not necessarily indicative of the results that may be expected for the entire year. The December 31, 2014 condensed consolidated balance sheet data was derived from the audited financial statements but does not include all disclosures required by accounting principles generally accepted in the United States of America (“GAAP”). This Quarterly Report on Form 10-Q should be read in connection with the Company’s Annual Report on Form 10-K for the year ended December 31, 2014, which includes all disclosures required by GAAP.
Liquidity	Liquidity
	The Company has incurred net losses in each of its annual periods since its inception. As shown in the accompanying condensed consolidated financial statements, the Company incurred a net loss of approximately $7,671 for the quarter ended March 31, 2015. 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 and secondary public offering in 2013, the Company received 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 April 1, 2016.
	The Company has additionally considered the impact of continued operating losses and cash flow deficiencies on the carrying value of goodwill and long-lived assets held and used by the Company. Based on the assessment completed by management, no impairment loss has been recorded by the Company during the quarter ended March 31, 2015. Assessing the recoverability of goodwill and long-lived assets held for use requires significant judgments and estimates by management. A deterioration in general economic conditions, negative developments in equity and credit markets, a significant decline in the Company’s market capitalization, adverse changes in the markets in which the Company 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 other indicators, could cause a future assessment to be performed which may result in an impairment of goodwill, long-lived assets held for use, or both, resulting in an material adverse effect on the financial position and results of operations of the Company.
Recently Adopted Accounting Guidance	Recently Adopted Accounting Guidance
	On January 1, 2015, the Company adopted Financial Accounting Standards Board (“FASB”) guidance clarifying the presentation of unrecognized tax benefits when a net operating loss carryforward, or similar tax loss or a tax credit carryforward exists. The amendment requires that unrecognized tax benefits be presented in the consolidated financial statements as a reduction to a deferred tax asset for a net operating loss carryforward, a similar tax loss, or a tax credit carryforward, unless certain exceptions exist. Previously, there was diversity in practice as no explicit guidance existed. As the Company had previously followed the now required presentation, the adoption of this guidance did not have a material impact on the consolidated financial statements of the Company.
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 April 2015, the FASB issued changes to the presentation of debt issuance costs in financial statements. These changes require an entity to present such costs in the balance sheet as a direct deduction from the related debt liability rather than as an asset. Amortization of the costs will continue to be reported as interest expense. These changes become effective for the Company on December 31, 2016, or March 31, 2016, in the event that the Company no longer qualifies as an emerging growth company in accordance with the JOBS Act. Early adoption is permitted. The new guidance will be applied retrospectively to each prior period presented. Management is currently evaluating the potential impact of these changes on the consolidated financial statements of the Company.
Earnings Per Share	The Company presents basic and diluted net loss per common share amounts. Basic net loss per share is calculated by dividing net loss available to common shareholders by the weighted average number of common shares outstanding during the applicable period. Diluted net loss per share is calculated by dividing net loss available to 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)	3 Months Ended
	Mar. 31, 2015
Equity [Abstract]
Summary of Changes in the Components of Accumulated Other Comprehensive Loss	The following table summarizes changes in the components of accumulated other comprehensive loss:
		Quarter Ended
		March 31,
	Foreign currency translation adjustments	2015			2014
	Balance at beginning of period	$	(8,203	)	$	(352	)
	Other comprehensive (loss) income		(5,348	)		112
	Balance at end of period	$	(13,551	)	$	(240	)

Earnings_Per_Share_Tables

Earnings Per Share (Tables)	3 Months Ended
	Mar. 31, 2015
Earnings Per Share [Abstract]
Computation of Basic and Diluted Net Loss Per Common Share	The information used to compute basic and diluted net loss per common share was as follows:
		Quarter Ended
		March 31,
		2015			2014
	Net loss	$	(7,671	)	$	(5,527	)
	Weighted average shares outstanding (basic and diluted)		14,423,237			14,392,403
	Net loss per common share:
	Basic	$	(0.53	)	$	(0.38	)
	Diluted	$	(0.53	)	$	(0.38	)

Inventories_Tables

Inventories (Tables)	3 Months Ended
	Mar. 31, 2015
Inventory Disclosure [Abstract]
Schedule of Inventories	Inventories consist of the following:
		March 31,		December 31,
		2015		2014
	Raw materials and components	$	10,775	$	10,838
	Work in process		4,466		4,221
	Finished goods		2,518		1,955
		$	17,759	$	17,014

EquityBased_Compensation_Table

Equity-Based Compensation (Tables)	3 Months Ended
	Mar. 31, 2015
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:
			Quarter Ended
			March 31,
			2015			2014
	Equity-based compensation expense recognized:
	Incentive stock options		$	195		$	160
	Restricted stock			208			83
	Stock bonus awards			—			197
	Total equity-based compensation expense before income taxes			403			440
	Benefit for income taxes*			—			—
	Total equity-based compensation expense net of income taxes		$	403		$	440
	*	The benefit for income taxes from equity-based compensation for each of the periods presented has been determined to be $0 based on valuation allowances against net deferred tax assets.
Summary of Activity for ISOs	The activity for ISOs for the quarter ended March 31, 2015, was as follows:
			Number of			Weighted		Weighted
			ISOs			Average Exercise		Average Grant
						Price		Date Fair Value
	Outstanding at December 31, 2014			215,137		$	17.35	$	10.62
	ISOs granted			—		$	—	$	—
	ISOs exercised			—		$	—	$	—
	ISOs forfeited			(7,334	)	$	17.54	$	11.03
	Outstanding at March 31, 2015			207,803		$	17.34	$	10.61
	ISOs exercisable at March 31, 2015			96,472		$	18	$	11.03
	ISOs expected to vest at March 31, 2015			106,248		$	16.79	$	10.26
Summary of Activity for Restricted Stock Awards	The activity for restricted stock awards for the quarter ended March 31, 2015, was as follows:
			Shares of			Weighted
			Restricted Stock			Average Grant
						Date Fair Value
	Outstanding at December 31, 2014			80,834		$	22.78
	Restricted shares granted			22,500		$	14.17
	Restricted shares vested*			(10,831	)	$	34.8
	Restricted shares forfeited			—		$	—
	Outstanding at March 31, 2015			92,503		$	19.28
	Restricted shares expected to vest at December 31, 2015			92,503		$	19.28
	*	Restricted shares vesting during the quarter ended March 31, 2015, had a fair value of approximately $158.

Fair_Value_Measurements_Tables

Fair Value Measurements (Tables)	3 Months Ended
	Mar. 31, 2015
Fair Value Disclosures [Abstract]
Fair Value of Liabilities Measured on Recurring Basis	The following table sets forth the fair value of the Company’s liabilities measured on a recurring basis by level:
		Level		March 31,		December 31,
				2015		2014
	Accrued expenses and other current liabilities:
	Contingent consideration		3	$	193	$	190
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:
		Quarter Ended
		March 31,
		2015		2014
	Beginning balance	$	190	$	—
	Purchases		—		—
	Sales		—		—
	Issuances		—		377
	Settlements		—		—
	Realized (gains) losses		—		—
	Unrealized (gains) losses		3		—
	Transfers into Level 3		—		—
	Transfers out of Level 3		—		—
	Ending balance	$	193	$	377
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:
		March 31,				December 31,
		2015				2014
		Carrying		Fair		Carrying		Fair
		Value		Value		Value		Value
	Cash and cash equivalents	$	30,101	$	30,101	$	36,202	$	36,202
	Current portion of long-term debt	$	134	$	134	$	132	$	132
	Current portion of capital and financing leases	$	216	$	216	$	346	$	346
	Long-term debt - net of current portion	$	1,916	$	1,894	$	1,950	$	2,022
	Capital and financing leases - net of current portion	$	144	$	144	$	164	$	164

Basis_of_Presentation_and_Prin2

Basis of Presentation and Principles of Consolidation - Additional Information (Detail) (USD $)	3 Months Ended		12 Months Ended	0 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2013	Sep. 13, 2013	Sep. 09, 2013	Feb. 12, 2013	Feb. 06, 2013
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Date of incorporation	1-Jan-13
State of incorporation	Delaware
Net proceeds of secondary public offering			$157,311,000
Net income (loss)	-7,671,000	-5,527,000
Impairment losses	0
Impact on the consolidated financial statements	0
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
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

Accumulated_Other_Comprehensiv2

Accumulated Other Comprehensive Loss - Summary of Changes in the Components of Accumulated Other Comprehensive Loss (Detail) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Statement of Comprehensive Income [Abstract]
Balance at beginning of period	($8,203)	($352)
Other comprehensive (loss) income	-5,348	112
Balance at end of period	($13,551)	($240)

Accumulated_Other_Comprehensiv3

Accumulated Other Comprehensive Loss - Additional Information (Detail) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Statement of Comprehensive Income [Abstract]
Accumulated other comprehensive loss, tax	$0	$0
Amounts reclassified to earnings from accumulated other comprehensive loss	$0	$0

Earnings_Per_Share_Additional_

Earnings Per Share - Additional Information (Detail)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Incentive Stock Option [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potential shares of anti-dilutive common stock	207,803	155,637
Restricted Stock [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potential shares of anti-dilutive common stock	92,503	25,834

Earnings_Per_Share_Computation

Earnings Per Share - Computation of Basic and Diluted Net Loss Per Common Share (Detail) (USD $)	3 Months Ended
In Thousands, except Share data, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Earnings Per Share [Abstract]
Net loss	($7,671)	($5,527)
Weighted average shares outstanding (basic and diluted)	14,423,237	14,392,403
Net loss per common share:
Basic	($0.53)	($0.38)
Diluted	($0.53)	($0.38)

Inventories_Schedule_of_Invent

Inventories - Schedule of Inventories (Detail) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Inventory Disclosure [Abstract]
Raw materials and components	$10,775	$10,838
Work in process	4,466	4,221
Finished goods	2,518	1,955
Inventories	$17,759	$17,014

Inventories_Additional_Informa

Inventories - Additional Information (Detail) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Inventory [Line Items]
Allowance for slow-moving and obsolete inventories	$1,165	$1,241
Laser Micromachining Product [Member]
Inventory [Line Items]
Allowance for slow-moving and obsolete inventories	$406	$419

EquityBased_Compensation_Addit

Equity-Based Compensation - Additional Information (Detail) (USD $)	3 Months Ended		0 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Jan. 24, 2013	Dec. 31, 2014
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	1 year 10 months 24 days
Proceeds from exercise of stock options		$318,000
Number of stock exercise	0
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total future compensation expense	1,601,000
ISOs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total future compensation expense	1,002,000
Intrinsic value	0
Intrinsic value	0
Weighted average remaining contractual term	6 years 9 months 18 days
Intrinsic value of ISOs exercised by employee		306,000
Proceeds from exercise of stock options		318,000
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 $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Equity-based compensation expense recognized:
Total equity-based compensation expense before income taxes	$403	$440
Total equity-based compensation expense net of income taxes	403	440
ISOs [Member]
Equity-based compensation expense recognized:
Total equity-based compensation expense before income taxes	195	160
Restricted Stock [Member]
Equity-based compensation expense recognized:
Total equity-based compensation expense before income taxes	208	83
Stock Bonus Awards [Member]
Equity-based compensation expense recognized:
Total equity-based compensation expense before income taxes		$197

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) (Valuation Allowances [Member], USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Valuation Allowances [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Benefit for income taxes from equity-based compensation	$0	$0

EquityBased_Compensation_Summa2

Equity-Based Compensation - Summary of Activity for ISOs (Detail) (USD $)	3 Months Ended
	Mar. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Number of ISOs, outstanding, Beginning Balance	215,137
Number of ISOs, granted	0
Number of ISOs, exercised	0
Number of ISOs, forfeited	-7,334
Number of ISOs, outstanding, Ending Balance	207,803
Number of ISOs, exercisable	96,472
Number of ISOs, expected to vest, net of forfeitures	106,248
Weighted Average Exercise Price, Beginning Balance	$17.35
Weighted Average Exercise Price, ISOs granted	$0
Weighted Average Exercise Price, ISOs exercised	$0
Weighted Average Exercise Price, ISOs forfeited	$17.54
Weighted Average Exercise Price, Ending Balance	$17.34
Weighted Average Exercise Price, ISOs exercisable	$18
Weighted Average Exercise Price, ISOs expected to vest, net of forfeitures	$16.79
Weighted Average Grant Date Fair Value, Beginning Balance	$10.62
Weighted Average Grant Date Fair Value, ISOs granted	$0
Weighted Average Grant Date Fair Value, ISOs exercised	$0
Weighted Average Grant Date Fair Value, ISOs forfeited	$11.03
Weighted Average Grant Date Fair Value, Ending Balance	$10.61
Weighted Average Grant Date Fair Value, ISOs exercisable	$11.03
Weighted Average Grant Date Fair Value, ISOs expected to vest, net of forfeitures	$10.26

EquityBased_Compensation_Summa3

Equity-Based Compensation - Summary of Activity for Restricted Stock Awards (Detail) (Restricted Stock [Member], USD $)	3 Months Ended
	Mar. 31, 2015
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Restricted Shares, outstanding, Beginning Balance	80,834
Number of Restricted Shares, granted	22,500
Number of Restricted Shares, vested	-10,831
Number of Restricted Shares, forfeited	0
Number of Restricted Shares, outstanding, Ending Balance	92,503
Number of Restricted Shares, expected to vest	92,503
Weighted Average Grant Date Fair Value, Beginning Balance	$22.78
Weighted Average Grant Date Fair Value, granted	$14.17
Weighted Average Grant Date Fair Value, vested	$34.80
Weighted Average Grant Date Fair Value, forfeited	$0
Weighted Average Grant Date Fair Value, Ending Balance	$19.28
Weighted Average Grant Date Fair Value, expected to vest	$19.28

EquityBased_Compensation_Summa4

Equity-Based Compensation - Summary of Activity for Restricted Stock Awards (Parenthetical) (Detail) (Restricted Stock [Member], USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of restricted shares vesting	$158

Income_Taxes_Additional_Inform

Income Taxes - Additional Information (Detail) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Schedule Of Income Taxes [Line Items]
(Benefit) provision for income taxes	($59)	$164
Effective tax rate	0.80%	3.10%
U.S. federal statutory rate	34.00%	34.00%
Liability for uncertain tax positions	777		871
ExOne GmbH (Germany) [Member] | Germany [Member]
Schedule Of Income Taxes [Line Items]
Liability for uncertain tax positions	437		354
ExOne KK (Japan) [Member] | Japan [Member]
Schedule Of Income Taxes [Line Items]
Liability for uncertain tax positions	$437		$354

Fair_Value_Measurements_Fair_V

Fair Value Measurements - Fair Value of Liabilities Measured on Recurring Basis (Detail) (Fair Value, Inputs, Level 3 [Member], USD $)	Mar. 31, 2015	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, Contingent consideration	$193	$190

Fair_Value_Measurements_Additi

Fair Value Measurements - Additional Information (Detail) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Revenue	$6,793	$7,285
Gross profit		1,619
Changes in fair value of contingent consideration	3
MAM Corporation [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Changes in fair value of contingent consideration	3
Earn Out Provision 2015 [Member] | Minimum [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Revenue	3,500
Gross profit	$875

Fair_Value_Measurements_Summar

Fair Value Measurements - Summary of Changes in Fair Value of Company's Level 3 Financial Instruments (Detail) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Fair Value Disclosures [Abstract]
Beginning balance	$190
Purchases	0	0
Sales	0	0
Issuances	0	377
Settlements	0	0
Realized (gains) losses	0	0
Unrealized (gains) losses	3	0
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Ending balance	$193	$377

Fair_Value_Measurements_Carryi

Fair Value Measurements - Carrying Values and Fair Values of Other Financial Instruments (Detail) (USD $)	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	$30,101	$36,202	$77,590	$98,445
Current portion of long-term debt	134	132
Current portion of capital and financing leases	216	346
Long-term debt - net of current portion	1,916	1,950
Capital and financing leases - net of current portion	144	164
Carrying Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	30,101	36,202
Current portion of long-term debt	134	132
Current portion of capital and financing leases	216	346
Long-term debt - net of current portion	1,916	1,950
Capital and financing leases - net of current portion	144	164
Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	30,101	36,202
Current portion of long-term debt	134	132
Current portion of capital and financing leases	216	346
Long-term debt - net of current portion	1,894	2,022
Capital and financing leases - net of current portion	$144	$164

Customer_Concentrations_Additi

Customer Concentrations - Additional Information (Detail) (Five Most Significant Customers [Member], USD $)	0 Months Ended		3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
	Customer	Customer	Customer	Customer
Revenue, Major Customer [Line Items]
Number of customers	5	5	5	5
Accounts receivable from significant customers	$4,653	$6,326	$4,653		$6,326
Customer Concentration Risk [Member] | Sales Revenue, Net [Member]
Revenue, Major Customer [Line Items]
Revenue concentration, by most significant customers			23.50%	39.00%

Related_Party_Transactions_Add

Related Party Transactions - Additional Information (Detail) (USD $)	12 Months Ended	3 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Mar. 31, 2015
3D Printing Machines [Member]
Related Party Transaction [Line Items]
Consideration for printing machine	$1,000	$950
Revenue	815
Remaining deferred consideration		185
Consulting [Member] | Hans J. Sack [Member]
Related Party Transaction [Line Items]
Consulting arrangement consideration amount		75
Consulting arrangement consideration amount		$50