ExOne (XONE) 10-Q 13 Nov 14 2014 Q3 Quarterly report Financial data

Document_and_Entity_Informatio

Document and Entity Information	9 Months Ended
	Sep. 30, 2014	Nov. 13, 2014
Document And Entity Information [Abstract]	'	'
Document Type	'10-Q	'
Amendment Flag	'false	'
Document Period End Date	30-Sep-14	'
Document Fiscal Year Focus	'2014	'
Document Fiscal Period Focus	'Q3	'
Trading Symbol	'XONE	'
Entity Registrant Name	'ExOne Co	'
Entity Central Index Key	'0001561627	'
Current Fiscal Year End Date	'--12-31	'
Entity Filer Category	'Non-accelerated Filer	'
Entity Common Stock, Shares Outstanding	'	14,442,804

Condensed_Statement_of_Consoli

Condensed Statement of Consolidated Operations and Comprehensive (Loss) Income (USD $)	3 Months Ended		9 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Income Statement [Abstract]	'	'	'	'
Revenue	$9,649	$11,621	$28,135	$28,785
Cost of sales	7,162	6,370	21,533	16,515
Gross profit	2,487	5,251	6,602	12,270
Operating expenses	'	'	'	'
Research and development	2,261	1,286	6,014	3,418
Selling, general and administrative	4,593	3,703	15,061	11,179
Total operating expenses	6,854	4,989	21,075	14,597
(Loss) income from operations	-4,367	262	-14,473	-2,327
Other (income) expense	'	'	'	'
Interest expense	32	46	106	326
Other (income) expense - net	-55	1	-210	-63
Total other (income) expense	-23	47	-104	263
(Loss) income before income taxes	-4,344	215	-14,369	-2,590
Provision for income taxes	107	439	274	530
Net loss	-4,451	-224	-14,643	-3,120
Less: Net income attributable to noncontrolling interests	'	'	'	138
Net loss attributable to ExOne	-4,451	-224	-14,643	-3,258
Net loss attributable to ExOne per common share:	'	'	'	'
Basic	($0.31)	($0.02)	($1.02)	($0.28)
Diluted	($0.31)	($0.02)	($1.02)	($0.28)
Comprehensive (loss) income:	'	'	'	'
Net loss	-4,451	-224	-14,643	-3,258
Other comprehensive (loss) income:	'	'	'	'
Foreign currency translation adjustments	-4,656	470	-4,838	-287
Comprehensive (loss) income	-9,107	246	-19,481	-3,545
Less: Comprehensive income (loss) attributable to noncontrolling interests	'	'	'	'
Comprehensive (loss) income attributable to ExOne	($9,107)	$246	($19,481)	($3,545)

Condensed_Consolidated_Balance

Condensed Consolidated Balance Sheet (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Current assets:	'	'
Cash and cash equivalents	$45,206	$98,445
Accounts receivable - net of allowance of $202 (2014) and $63 (2013)	14,178	9,042
Inventories - net	18,161	12,764
Prepaid expenses and other current assets	3,049	3,297
Total current assets	80,594	123,548
Property and equipment - net	52,968	32,772
Goodwill	6,820	'
Other noncurrent assets	954	2,115
Total assets	141,336	158,435
Current liabilities:	'	'
Current portion of long-term debt	131	127
Current portion of capital and financing leases	427	549
Accounts payable	3,038	1,748
Accrued expenses and other current liabilities	5,590	5,394
Deferred revenue and customer prepayments	1,179	916
Total current liabilities	10,365	8,734
Long-term debt - net of current portion	1,983	2,082
Capital and financing leases - net of current portion	232	475
Other noncurrent liabilities	276	444
Total liabilities	12,856	11,735
Contingencies and commitments	'	'
Stockholders' equity	'	'
Common stock, $0.01 par value, 200,000,000 shares authorized, 14,416,970 (2014) and 14,387,608 (2013) shares issued and outstanding	144	144
Additional paid-in capital	154,624	153,363
Accumulated deficit	-21,098	-6,455
Accumulated other comprehensive loss	-5,190	-352
Total stockholders' equity	128,480	146,700
Total liabilities and stockholders' equity	$141,336	$158,435

Condensed_Consolidated_Balance1

Condensed Consolidated Balance Sheet (Parenthetical) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Thousands, except Share data, unless otherwise specified
Statement of Financial Position [Abstract]	'	'
Allowance for accounts receivable	$202	$63
Common stock, par value	$0.01	$0.01
Common stock, shares authorized	200,000,000	200,000,000
Common stock, shares issued	14,416,970	14,387,608
Common stock, shares outstanding	14,416,970	14,387,608

Condensed_Statement_of_Consoli1

Condensed Statement of Consolidated Cash Flows (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013
Operating activities	'	'
Net loss	($14,643)	($3,120)
Adjustments to reconcile net loss to cash used for operations:	'	'
Depreciation and amortization	2,583	1,685
Equity-based compensation	943	511
Provision for bad debts	145	72
Changes in fair value of contingent consideration	-194	'
Changes in assets and liabilities, excluding effects of acquisitions and foreign currency translation adjustments:	'	'
Increase in accounts receivable	-4,411	-268
Increase in inventories	-9,328	-6,128
Decrease (increase) in prepaid expenses and other assets	257	-2,723
Increase (decrease) in accounts payable	603	-75
(Decrease) increase in accrued expenses and other liabilities	-846	187
Increase (decrease) in deferred revenue and customer prepayments	296	-3,592
Cash used for operating activities	-24,595	-13,451
Investing activities	'	'
Capital expenditures	-18,586	-9,822
Acquisitions, net of cash acquired of $201	-9,230	'
Cash effect of deconsolidation of noncontrolling interests in variable interest entities	'	-2,327
Cash used for investing activities	-27,816	-12,149
Financing activities	'	'
Net proceeds from issuance of common stock - initial public offering	'	91,083
Net proceeds from issuance of common stock - secondary public offering	'	65,201
Proceeds from exercise of employee stock options	318	'
Net change in line of credit borrowings	'	-528
Net change in demand note payable to member	'	-9,885
Payments on long-term debt	-433	-5,457
Payments on capital and financing leases	-411	-2,031
Payment of preferred stock dividends	'	-456
Cash (used for) provided by financing activities	-526	137,927
Effect of exchange rate changes on cash and cash equivalents	-302	15
Net change in cash and cash equivalents	-53,239	112,342
Cash and cash equivalents at beginning of period	98,445	2,802
Cash and cash equivalents at end of period	45,206	115,144
Supplemental disclosure of noncash investing and financing activities	'	'
Net assets acquired through acquisitions, net of cash acquired of $201	9,685	'
Noncash consideration for acquisitions	-455	'
Property and equipment included in accounts payable	682	'
Property and equipment acquired through financing arrangements	89	282
Transfer of inventories to property and equipment for internal use	3,935	3,338
Transfer of internally developed 3D printing machines from property and equipment to inventories for sale	332	261
Conversion of preferred stock dividends payable and accrued interest to principal amounts due under the demand note payable to member	'	1,219
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)

Condensed_Statement_of_Consoli2

Condensed Statement of Consolidated Cash Flows (Parenthetical) (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014
Statement of Cash Flows [Abstract]	'
Cash acquired from acquisitions	$201

Condensed_Statement_of_Changes

Condensed Statement of Changes in Consolidated Stockholders' / Members' Equity (USD $)

Total

Prior to Reorganization [Member]

Preferred Units [Member]

Preferred Units [Member]

Common Units [Member]

Common Units [Member]

Members' Deficit [Member]

Members' Deficit [Member]

Preferred Stock [Member]

Preferred Stock [Member]

Common Stock [Member]

Common Stock [Member]

Additional Paid-in Capital [Member]

Additional Paid-in Capital [Member]

Accumulated Deficit [Member]

Accumulated Deficit [Member]

Accumulated Other Comprehensive Loss [Member]

Accumulated Other Comprehensive Loss [Member]

Noncontrolling Interests [Member]

Noncontrolling Interests [Member]

In Thousands

Prior to Reorganization [Member]

Prior to Reorganization [Member]

Prior to Reorganization [Member]

Prior to Reorganization [Member]

Prior to Reorganization [Member]

Prior to Reorganization [Member]

Prior to Reorganization [Member]

Prior to Reorganization [Member]

Prior to Reorganization [Member]

Beginning Balance at Dec. 31, 2012

'

$41

'

$18,984

'

$10,000

'

($31,355)

'

'

'

'

'

'

'

'

'

($174)

'

$2,586

Reorganization of The Ex One Company, LLC with and into The ExOne Company

'

'

-18,984

'

-10,000

'

31,355

'

190

'

58

'

-2,619

'

'

'

'

'

'

'

Preferred stock dividends

-152

'

'

'

'

'

'

'

'

'

'

'

-152

'

'

'

'

'

'

'

Conversion of preferred stock to common stock

'

'

'

'

'

'

'

'

-190

'

20

'

170

'

'

'

'

'

'

'

Initial public offering of common stock in The ExOne Company, net of issuance costs

90,371

'

'

'

'

'

'

'

'

'

55

'

90,316

'

'

'

'

'

'

'

Secondary public offering of common stock in The ExOne Company, net of issuance costs

64,948

'

'

'

'

'

'

'

'

'

11

'

64,937

'

'

'

'

'

'

'

Net loss

-3,120

'

'

'

'

'

'

'

'

'

'

'

'

'

-3,258

'

'

'

138

'

Other comprehensive loss

-287

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

-287

'

'

'

Equity-based compensation

511

'

'

'

'

'

'

'

'

'

'

'

511

'

'

'

'

'

'

'

Deconsolidation of noncontrolling interests in variable interest entities

-2,724

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

-2,724

'

Ending Balance at Sep. 30, 2013

149,588

'

'

'

'

'

'

'

'

'

144

'

153,163

'

-3,258

'

-461

'

'

'

Beginning Balance at Dec. 31, 2013

146,700

'

'

'

'

'

'

'

'

'

144

'

153,363

'

-6,455

'

-352

'

'

'

Preferred stock dividends

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Net loss

-14,643

'

'

'

'

'

'

'

'

'

'

'

'

'

-14,643

'

'

'

'

'

Other comprehensive loss

-4,838

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

-4,838

'

'

'

Equity-based compensation

943

'

'

'

'

'

'

'

'

'

'

'

943

'

'

'

'

'

'

'

Common stock issued from equity incentive plan

318

'

'

'

'

'

'

'

'

'

'

'

318

'

'

'

'

'

'

'

Ending Balance at Sep. 30, 2014

$128,480

'

'

'

'

'

'

'

'

'

$144

'

$154,624

'

($21,098)

'

($5,190)

'

'

'

Basis_of_Presentation_and_Prin

Basis of Presentation and Principles of Consolidation	9 Months Ended
	Sep. 30, 2014
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.
	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 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 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. FASB 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 condensed 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 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, 2013 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, 2013, which includes all disclosures required by GAAP.
	Liquidity
	The Company has incurred net losses of approximately $6,317, $9,688, and $7,617 for the years ended December 31, 2013, 2012 and 2011, respectively. As shown in the accompanying condensed consolidated financial statements, the Company incurred a net loss of approximately $4,451 and $14,643 for the quarter and nine months ended September 30, 2014, 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 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 unrestricted net proceeds obtained through these transactions will be sufficient to support the Company’s operations through November 14, 2015.
	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 condensed 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 result in less complex guidance in application while providing 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.

Accumulated_Other_Comprehensiv

Accumulated Other Comprehensive Loss	9 Months Ended
	Sep. 30, 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:
		Quarter Ended						Nine Months Ended
		September 30,						September 30,
	Foreign currency translation adjustments	2014			2013			2014			2013
	Balance at beginning of period	$	(534	)	$	(931	)	$	(352	)	$	(174	)
	Other comprehensive (loss) income		(4,656	)		470			(4,838	)		(287	)
	Balance at end of period	$	(5,190	)	$	(461	)	$	(5,190	)	$	(461	)
	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 (US Dollar) and (ii) 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	9 Months Ended
	Sep. 30, 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 the quarter and nine months ended September 30, 2013, include (i) 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) 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 the quarter and nine months ended September 30, 2014, additionally include (i) the annual vesting of 10,000 shares of restricted stock on March 11, 2014, (ii) 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 and (iii) the issuance of 17,696 shares of common stock during the nine months ended September 30, 2014, as a result of employee exercises of incentive stock options.
	As ExOne incurred a net loss during each of the quarters and nine months ended September 30, 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 (153,970 – 2014 and 175,000 – 2013) and unvested restricted stock issued (25,834 – 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:
		Quarter Ended						Nine Months Ended
		September 30,						September 30,
		2014			2013			2014			2013
	Net loss attributable to ExOne	$	(4,451	)	$	(224	)	$	(14,643	)	$	(3,258	)
	Less: Preferred stock dividends declared		—			—			—			(152	)
	Net loss available to ExOne common shareholders	$	(4,451	)	$	(224	)	$	(14,643	)	$	(3,410	)
	Weighted average shares outstanding (basic and diluted)		14,416,970			13,534,065			14,408,871			12,316,096
	Net loss attributable to ExOne per common share:
	Basic	$	(0.31	)	$	(0.02	)	$	(1.02	)	$	(0.28	)
	Diluted	$	(0.31	)	$	(0.02	)	$	(1.02	)	$	(0.28	)

Acquisitions

Acquisitions	9 Months Ended
	Sep. 30, 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 $4,995, which includes approximately $4,618 in cash and $377 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 on the date of acquisition.
	The following table summarizes the preliminary allocation of purchase price:
	Accounts receivable	$	222
	Inventories		246
	Prepaid expenses and other current assets		15
	Property and equipment		2,491
	Intangible assets		200
	Goodwill		2,261
	Total assets		5,435
	Accounts payable		49
	Accrued expenses and other current liabilities		53
	Long-term debt		338
	Total liabilities		440
	Total purchase price	$	4,995
	The Company estimates that all of the goodwill associated with the MAM acquisition 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.
	Intangible assets identified by the Company as part of its preliminary allocation of purchase price include customer relationships which are to be amortized over a period of five years. Intangible assets are included in other noncurrent assets in the condensed consolidated balance sheet. The Company is in the process of evaluating the MAM acquisition for identification of additional intangible assets in finalizing its purchase price allocation.
	During the quarter and nine months ended September 30, 2014, the Company recorded measurement period adjustments associated with revisions to initial estimates of net working capital (accounts receivable, inventories and accounts payable) of approximately $9 (increase to net working capital) and $41 (decrease to net working capital), respectively, resulting in a corresponding (decrease) increase to goodwill. The Company expects to complete its purchase accounting exercise by the end of 2014.
	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 the nine months ended September 30, 2014 (the remainder recognized during the year ended December 31, 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 condensed statement of consolidated operations and comprehensive (loss) income.
	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 €3,557 ($4,891), which includes approximately €3,500 ($4,813) in cash and approximately €57 ($78) in other net liabilities settled at the date of acquisition.
	The following table summarizes the preliminary allocation of purchase price:
	Cash and cash equivalents	$	201
	Accounts receivable		1
	Inventories		525
	Prepaid expenses and other current assets		29
	Property and equipment		25
	Goodwill		4,842
	Total assets		5,623
	Accounts payable		127
	Accrued expenses and other current liabilities		605
	Total liabilities		732
	Total purchase price	$	4,891
	None of the goodwill associated with the MWT acquisition will be 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 Augsburg, 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.
	During the quarter and nine months ended September 30, 2014, the Company recorded measurement period adjustments associated with revisions to initial estimates of net working capital (inventories and accounts payable) of approximately $46 (decrease to net working capital) and $52 (decrease to net working capital), respectively, resulting in a corresponding increase to goodwill during the period. In addition, the Company is in the process of evaluating the MWT acquisition for identification of intangible assets in finalizing its purchase price allocation. The Company expects to complete its purchase accounting exercise by the end of 2014.
	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 the nine months ended September 30, 2014 (the remainder recognized during the year ended December 31, 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 condensed statement of consolidated operations and comprehensive (loss) income.
	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.
	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, 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. The Company operates as both a single operating segment 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 plans to use both the market approach and income approach to estimate the fair value of its reporting unit when testing for impairment. The market approach includes consideration of (i) current trading multiples of comparable entities, (ii) market pricing from comparable merger and acquisition transactions and (iii) the Company’s existing market capitalization along with consideration of a control premium (as a single reporting unit entity). 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 plans to complete its initial annual test of impairment related to goodwill during its fourth fiscal quarter absent indicators (a trigger event) requiring an earlier test to be performed. There were no such indicators identified during the quarter or nine months ended September 30, 2014.
	The following table details the changes in the carrying value of goodwill:
	Balance at December 31, 2013	$	—
	Acquisition of businesses		7,196
	Foreign currency translation adjustments		(376	)
	Balance at September 30, 2014	$	6,820
	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 condensed statement of consolidated operations and comprehensive (loss) income. 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.
	During the quarter and nine months ended September 30, 2014, the Company recorded changes in the fair value of contingent consideration issued in connection with the MAM acquisition of approximately $3 (an increase to other noncurrent liabilities) and $194 (a reduction to accrued expenses and other current liabilities of approximately $200 and an increase to other noncurrent liabilities of $6), with a corresponding amount recorded to selling, general and administrative expenses. Changes in contingent consideration recorded by the Company during the quarter ended September 30, 2014 are based on the impact of discounting future cash payments on the associated liabilities. Changes in contingent consideration recorded by the Company during the nine months ended September 30, 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, and (ii) the impact of discounting future cash payments on the associated liabilities.
	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	9 Months Ended
	Sep. 30, 2014
Inventory Disclosure [Abstract]	'
Inventories	'
	Note 5. Inventories
	Inventories consist of the following:
		September 30,		December 31,
		2014		2013
	Raw materials and components	$	9,849	$	6,253
	Work in process		7,966		5,957
	Finished goods		346		554
		$	18,161	$	12,764
	Raw materials and components consist of consumable materials and component parts associated with 3D printing machine and micromachinery manufacturing and support activities. Work in process consists of 3D printing machines and micromachinery, subassemblies and other products in varying stages of completion. Finished goods consist of 3D printing machines and micromachinery and other products prepared for delivery in accordance with customer specifications.
	At September 30, 2014 and December 31, 2013, the allowance for slow-moving and obsolete inventories was approximately $731 and $750, respectively, and has been reflected as a reduction to inventories (principally raw materials and components).

Line_of_Credit

Line of Credit	9 Months Ended
	Sep. 30, 2014
Debt Disclosure [Abstract]	'
Line of Credit	'
	Note 6. Line of Credit
	The Company has a line of credit and security agreement with a German bank collateralized by certain assets of the Company for approximately $1,600 (€1,300). Of the total amount available under this facility, approximately $600 (€500) is available for short-term borrowings or cash advances (overdrafts) with the additional $1,000 (€800) available for additional bank transactions requiring security (i.e. bank guarantees, letters of credit, etc.). Interest rates were 2.33%, 6.20% and 1.75% for short-term borrowings, overdrafts and transactions requiring security, respectively, at September 30, 2014. There is no commitment fee associated with this agreement. At September 30, 2014 and December 31, 2013, there were no outstanding short-term borrowings or overdrafts on the line of credit. At September 30, 2014 and December 31, 2013, the Company had transactions guaranteed by the security agreement of approximately $1,908 (€1,504) and $982 (€713), respectively. Included in the transactions guaranteed by the security agreement at September 30, 2014, were approximately $989 (€780) requiring compensating cash balances held by the Company with the same financial institution.

Contingencies_and_Commitments

Contingencies and Commitments	9 Months Ended
	Sep. 30, 2014
Commitments and Contingencies Disclosure [Abstract]	'
Contingencies and Commitments	'
	Note 7. 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.

Income_Taxes

Income Taxes	9 Months Ended
	Sep. 30, 2014
Income Tax Disclosure [Abstract]	'
Income Taxes	'
	Note 8. Income Taxes
	The provision for income taxes for the quarter and nine months ended September 30, 2014 was $107 and $274, respectively. The provision for income taxes for the quarter and nine months ended September 30, 2013 was $439 and $530, respectively. The Company has completed a discrete period computation of its 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 quarter and nine months ended September 30, 2014 was 2.5% (provision on a loss) and 1.9% (provision on a loss), respectively. The effective tax rate for the quarter and nine months ended September 30, 2013 was 204.2% (provision on income) and 20.5% (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 September 30, 2014 and December 31, 2013, the liability for uncertain tax positions was approximately $708 and $768, respectively, and is included in accrued expenses and other current liabilities in the condensed consolidated balance sheet. In addition, at September 30, 2014, the Company had a liability for uncertain tax positions related to its ExOne GmbH (Germany) and ExOne KK (Japan) subsidiaries of approximately $260 and $94, respectively, which were fully offset against net operating loss carryforwards of the 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.

EquityBased_Compensation

Equity-Based Compensation	9 Months Ended
	Sep. 30, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]	'
Equity-Based Compensation	'
	Note 9. 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.
	On January 2, 2014, the Board of Directors authorized the award of 7,500 shares of restricted stock under the Plan to three executives of the Company. The awards vest in one-third increments on the first, second and third anniversaries of the grant date, respectively.
	On March 20, 2014, the Board of Directors authorized the award of 5,000 shares of restricted stock under the Plan to an executive of the Company. This award vests in one-third increments on the first, second and third anniversaries of the grant date, respectively.
	Also on March 20, 2014, the Board of Directors separately authorized the award of 5,000 shares of common stock in the form of a stock bonus award to the independent members of the Board of Directors. The stock bonus awards vested immediately upon issuance.
	The following table summarizes the total equity-based compensation expense recognized for all ISOs, restricted stock and stock bonus awards:
			Quarter Ended,					Nine Months Ended,
			30-Sep					30-Sep
			2014			2013		2014		2013
	Equity-based compensation expense recognized:
	ISOs		$	156		$	161	$	475	$	418
	Restricted stock			94			39		271		93
	Stock bonus awards			—			—		197		—
	Total equity-based compensation expense before income taxes		$	250		$	200	$	943	$	511
	Benefit for income taxes*			—			—		—		—
	Total equity-based compensation expense net of income taxes		$	250		$	200	$	943	$	511
	*	The benefit for income taxes from equity-based compensation for each of the periods presented has been determined to be $0 based on a full valuation allowance against net deferred tax assets. In the absence of a full valuation allowance, the tax benefit derived from equity-based compensation would be approximately $53 and $222 for the quarter and nine months ended September 30, 2014, respectively, and $34 and $85 for the quarter and nine months ended September 30, 2013, respectively.
	At September 30, 2014, total future compensation expense related to unvested awards yet to be recognized by the Company was approximately $844 for ISOs and $729 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 1.7 years.
	The activity for ISOs for the nine months ended September 30, 2014, was as follows:
			Number of			Weighted		Weighted
			ISOs			Average		Average Grant
						Exercise Price		Date Fair
								Value
	Outstanding at December 31, 2013			173,333		$	18	$	11.03
	ISOs granted			—		$	—	$	—
	ISOs exercised			(17,696	)	$	18	$	11.03
	ISOs forfeited			(1,667	)	$	—	$	—
	Outstanding at September 30, 2014			153,970		$	18	$	11.03
	ISOs exercisable			40,637		$	18	$	11.03
	ISOs expected to vest			104,975		$	18	$	11.03
	At September 30, 2014, the aggregate intrinsic value of ISOs exercisable and ISOs expected to vest was approximately $117 and $303, respectively. The weighted average remaining contractual term of ISOs both exercisable and expected to vest at September 30, 2014, was approximately 8.4 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 other exercises during any other period in 2014 or 2013.
	The activity for restricted stock awards for the nine months ended September 30, 2014, was as follows:
			Shares of			Weighted
			Restricted			Average Grant
			Stock			Date Fair
						Value
	Outstanding at December 31, 2013			20,000		$	23.26
	Restricted shares granted			12,500		$	53.28
	Restricted shares vested*			(6,666	)	$	23.26
	Restricted shares forfeited			—		$	—
	Outstanding at September 30, 2014			25,834		$	37.78
	Restricted shares expected to vest			25,834		$	37.78
	*	Restricted shares vesting during the nine months ended September 30, 2014, had a fair value of approximately $282.

Fair_Value_Measurements

Fair Value Measurements	9 Months Ended
	Sep. 30, 2014
Fair Value Disclosures [Abstract]	'
Fair Value Measurements	'
	Note 10. 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		September 30,		December 31,
					2014		2013
	Accrued expenses and other current liabilities:
	MAM contingent consideration			3	$	—	$	—
	Other noncurrent liabilities
	MAM contingent consideration			3	$	183	$	—
	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 the quarter and nine months ended September 30, 2014, the Company recorded changes in the fair value of contingent consideration issued in connection with the MAM acquisition of approximately $3 (an increase to other noncurrent liabilities) and $194 (a reduction to accrued expenses and other current liabilities of approximately $200 and an increase to other noncurrent liabilities of $6), with a corresponding amount recorded to selling, general and administrative expenses. Changes in contingent consideration recorded by the Company during the quarter ended September 30, 2014 are based on the impact of discounting future cash payments on the associated liabilities. Changes in contingent consideration recorded by the Company during the nine months ended September 30, 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, and (ii) the impact of discounting future cash payments on the associated liabilities.
	The following table sets forth a summary of changes in the fair value of the Company’s Level 3 financial instruments:
			Quarter Ended				Nine Months Ended
			September 30,				September 30,
			2014		2013		2014			2013
	Beginning balance		$	180	$	—	$	—		$	—
	Purchases			—		—		—			—
	Sales			—		—		—			—
	Issuances			—		—		377			—
	Settlements			—		—		—			—
	Realized (gains) losses			—		—		(200	)		—
	Unrealized (gains) losses			3		—		6			—
	Transfers into Level 3			—		—		—			—
	Transfers out of Level 3			—		—		—			—
	Ending balance		$	183	$	—	$	183		$	—
	The carrying values and fair values of other financial instruments (assets and liabilities) not required to be recorded at fair value were as follows:
			September 30, 2014				December 31, 2013
			Carrying		Fair		Carrying			Fair
			Value		Value		Value			Value
	Cash and cash equivalents		$	45,206	$	45,206	$	98,445		$	98,445
	Current portion of long-term debt		$	131	$	131	$	127		$	127
	Current portion of capital and financing leases		$	427	$	427	$	549		$	549
	Long-term debt - net of current portion		$	1,983	$	2,040	$	2,082		$	1,666
	Capital and financing leases - net of current portion		$	232	$	232	$	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	9 Months Ended
	Sep. 30, 2014
Risks and Uncertainties [Abstract]	'
Customer Concentrations	'
	Note 11. Customer Concentrations
	During the quarter and nine months ended September 30, 2014 and 2013, the Company conducted a significant portion of its business with a limited number of customers. For the quarter and nine months ended September 30, 2014, the Company’s five most significant customers represented approximately 43.6% and 27.2% of total revenue, respectively. For the quarter and nine months ended September 30, 2013, the Company’s five most significant customers represented approximately 60.3% and 31.4% of total revenue, respectively. At September 30, 2014 and December 31, 2013, accounts receivable from the Company’s five most significant customers were approximately $6,396 and $5,912, respectively.

Subsequent_Events

Subsequent Events	9 Months Ended
	Sep. 30, 2014
Subsequent Events [Abstract]	'
Subsequent Events	'
	Note 12. 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)	9 Months Ended
	Sep. 30, 2014
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.
	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 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 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. FASB 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 condensed 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 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, 2013 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, 2013, which includes all disclosures required by GAAP.
Liquidity	'
	Liquidity
	The Company has incurred net losses of approximately $6,317, $9,688, and $7,617 for the years ended December 31, 2013, 2012 and 2011, respectively. As shown in the accompanying condensed consolidated financial statements, the Company incurred a net loss of approximately $4,451 and $14,643 for the quarter and nine months ended September 30, 2014, 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 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 unrestricted net proceeds obtained through these transactions will be sufficient to support the Company’s operations through November 14, 2015.
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 condensed 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 result in less complex guidance in application while providing 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.
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.
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, 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. The Company operates as both a single operating segment 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 plans to use both the market approach and income approach to estimate the fair value of its reporting unit when testing for impairment. The market approach includes consideration of (i) current trading multiples of comparable entities, (ii) market pricing from comparable merger and acquisition transactions and (iii) the Company’s existing market capitalization along with consideration of a control premium (as a single reporting unit entity). 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.

Accumulated_Other_Comprehensiv1

Accumulated Other Comprehensive Loss (Tables)	9 Months Ended
	Sep. 30, 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:
		Quarter Ended						Nine Months Ended
		September 30,						September 30,
	Foreign currency translation adjustments	2014			2013			2014			2013
	Balance at beginning of period	$	(534	)	$	(931	)	$	(352	)	$	(174	)
	Other comprehensive (loss) income		(4,656	)		470			(4,838	)		(287	)
	Balance at end of period	$	(5,190	)	$	(461	)	$	(5,190	)	$	(461	)

Earnings_Per_Share_Tables

Earnings Per Share (Tables)	9 Months Ended
	Sep. 30, 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:
		Quarter Ended						Nine Months Ended
		September 30,						September 30,
		2014			2013			2014			2013
	Net loss attributable to ExOne	$	(4,451	)	$	(224	)	$	(14,643	)	$	(3,258	)
	Less: Preferred stock dividends declared		—			—			—			(152	)
	Net loss available to ExOne common shareholders	$	(4,451	)	$	(224	)	$	(14,643	)	$	(3,410	)
	Weighted average shares outstanding (basic and diluted)		14,416,970			13,534,065			14,408,871			12,316,096
	Net loss attributable to ExOne per common share:
	Basic	$	(0.31	)	$	(0.02	)	$	(1.02	)	$	(0.28	)
	Diluted	$	(0.31	)	$	(0.02	)	$	(1.02	)	$	(0.28	)

Acquisitions_Tables

Acquisitions (Tables)	9 Months Ended
	Sep. 30, 2014
Schedule of Changes in Carrying Value of Goodwill	'
	The following table details the changes in the carrying value of goodwill:
	Balance at December 31, 2013	$	—
	Acquisition of businesses		7,196
	Foreign currency translation adjustments		(376	)
	Balance at September 30, 2014	$	6,820
MAM Corporation [Member]	'
Preliminary Allocation of Purchase Price	'
	The following table summarizes the preliminary allocation of purchase price:
	Accounts receivable	$	222
	Inventories		246
	Prepaid expenses and other current assets		15
	Property and equipment		2,491
	Intangible assets		200
	Goodwill		2,261
	Total assets		5,435
	Accounts payable		49
	Accrued expenses and other current liabilities		53
	Long-term debt		338
	Total liabilities		440
	Total purchase price	$	4,995
MWT Corporation [Member]	'
Preliminary Allocation of Purchase Price	'
	The following table summarizes the preliminary allocation of purchase price:
	Cash and cash equivalents	$	201
	Accounts receivable		1
	Inventories		525
	Prepaid expenses and other current assets		29
	Property and equipment		25
	Goodwill		4,842
	Total assets		5,623
	Accounts payable		127
	Accrued expenses and other current liabilities		605
	Total liabilities		732
	Total purchase price	$	4,891

Inventories_Tables

Inventories (Tables)	9 Months Ended
	Sep. 30, 2014
Inventory Disclosure [Abstract]	'
Schedule of Inventories	'
	Inventories consist of the following:
		September 30,		December 31,
		2014		2013
	Raw materials and components	$	9,849	$	6,253
	Work in process		7,966		5,957
	Finished goods		346		554
		$	18,161	$	12,764

EquityBased_Compensation_Table

Equity-Based Compensation (Tables)	9 Months Ended
	Sep. 30, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]	'
Summary of Total Equity-Based Compensation Expense Recognized for All ISOs, Restricted Stock and Stock Bonus Awards	'
	The following table summarizes the total equity-based compensation expense recognized for all ISOs, restricted stock and stock bonus awards:
			Quarter Ended,					Nine Months Ended,
			30-Sep					30-Sep
			2014			2013		2014		2013
	Equity-based compensation expense recognized:
	ISOs		$	156		$	161	$	475	$	418
	Restricted stock			94			39		271		93
	Stock bonus awards			—			—		197		—
	Total equity-based compensation expense before income taxes		$	250		$	200	$	943	$	511
	Benefit for income taxes*			—			—		—		—
	Total equity-based compensation expense net of income taxes		$	250		$	200	$	943	$	511
	*	The benefit for income taxes from equity-based compensation for each of the periods presented has been determined to be $0 based on a full valuation allowance against net deferred tax assets. In the absence of a full valuation allowance, the tax benefit derived from equity-based compensation would be approximately $53 and $222 for the quarter and nine months ended September 30, 2014, respectively, and $34 and $85 for the quarter and nine months ended September 30, 2013, respectively.
Summary of Activity for ISOs	'
	The activity for ISOs for the nine months ended September 30, 2014, was as follows:
			Number of			Weighted		Weighted
			ISOs			Average		Average Grant
						Exercise Price		Date Fair
								Value
	Outstanding at December 31, 2013			173,333		$	18	$	11.03
	ISOs granted			—		$	—	$	—
	ISOs exercised			(17,696	)	$	18	$	11.03
	ISOs forfeited			(1,667	)	$	—	$	—
	Outstanding at September 30, 2014			153,970		$	18	$	11.03
	ISOs exercisable			40,637		$	18	$	11.03
	ISOs expected to vest			104,975		$	18	$	11.03
Summary of Activity for Restricted Stock Awards	'
	The activity for restricted stock awards for the nine months ended September 30, 2014, was as follows:
			Shares of			Weighted
			Restricted			Average Grant
			Stock			Date Fair
						Value
	Outstanding at December 31, 2013			20,000		$	23.26
	Restricted shares granted			12,500		$	53.28
	Restricted shares vested*			(6,666	)	$	23.26
	Restricted shares forfeited			—		$	—
	Outstanding at September 30, 2014			25,834		$	37.78
	Restricted shares expected to vest			25,834		$	37.78
	*	Restricted shares vesting during the nine months ended September 30, 2014, had a fair value of approximately $282.

Fair_Value_Measurements_Tables

Fair Value Measurements (Tables)	9 Months Ended
	Sep. 30, 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		September 30,		December 31,
					2014		2013
	Accrued expenses and other current liabilities:
	MAM contingent consideration			3	$	—	$	—
	Other noncurrent liabilities
	MAM contingent consideration			3	$	183	$	—
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:
			Quarter Ended				Nine Months Ended
			September 30,				September 30,
			2014		2013		2014			2013
	Beginning balance		$	180	$	—	$	—		$	—
	Purchases			—		—		—			—
	Sales			—		—		—			—
	Issuances			—		—		377			—
	Settlements			—		—		—			—
	Realized (gains) losses			—		—		(200	)		—
	Unrealized (gains) losses			3		—		6			—
	Transfers into Level 3			—		—		—			—
	Transfers out of Level 3			—		—		—			—
	Ending balance		$	183	$	—	$	183		$	—
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:
			September 30, 2014				December 31, 2013
			Carrying		Fair		Carrying			Fair
			Value		Value		Value			Value
	Cash and cash equivalents		$	45,206	$	45,206	$	98,445		$	98,445
	Current portion of long-term debt		$	131	$	131	$	127		$	127
	Current portion of capital and financing leases		$	427	$	427	$	549		$	549
	Long-term debt - net of current portion		$	1,983	$	2,040	$	2,082		$	1,666
	Capital and financing leases - net of current portion		$	232	$	232	$	475		$	475

Basis_of_Presentation_and_Prin2

Basis of Presentation and Principles of Consolidation - Additional Information (Detail) (USD $)

3 Months Ended

9 Months Ended

12 Months Ended

0 Months Ended

0 Months Ended

In Thousands, except Share data, unless otherwise specified

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2013

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Feb. 12, 2013

Feb. 06, 2013

Feb. 06, 2013

Sep. 13, 2013

Sep. 09, 2013

Sep. 09, 2013

IPO [Member]

IPO [Member]

IPO [Member]

Secondary Public Offering [Member]

Secondary Public Offering [Member]

Secondary Public Offering [Member]

Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

Date of incorporation

'

'

1-Jan-13

'

'

'

'

'

'

'

'

'

'

State of incorporation

'

'

'Delaware

'

'

'

'

'

'

'

'

'

'

Common stock, new issuances

'

'

'

'

'

'

'

'

6,095,000

'

'

3,054,400

'

Common stock price per share

'

'

'

'

'

'

'

'

'

$18

'

'

$62

Common stock, new shares sold by Company

'

'

'

'

'

'

'

'

5,483,333

'

'

1,106,000

'

Common stock, new shares sold by stockholder

'

'

'

'

'

'

'

'

611,667

'

'

1,948,400

'

Net proceeds of initial public offering

'

'

'

$91,083

'

'

'

$91,996

'

'

'

'

'

Net proceeds of secondary public offering

'

'

'

65,201

157,311

'

'

'

'

'

65,315

'

'

Net income (loss)

-4,451

-224

-14,643

-3,120

-6,317

-9,688

-7,617

'

'

'

'

'

'

Impact on the consolidated financial statements

'

'

$0

'

'

'

'

'

'

'

'

'

'

Accumulated_Other_Comprehensiv2

Accumulated Other Comprehensive Loss - Summary of Changes in the Components of Accumulated Other Comprehensive Loss (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Statement of Comprehensive Income [Abstract]	'	'	'	'
Balance at beginning of period	($534)	($931)	($352)	($174)
Other comprehensive (loss) income	-4,656	470	-4,838	-287
Balance at end of period	($5,190)	($461)	($5,190)	($461)

Accumulated_Other_Comprehensiv3

Accumulated Other Comprehensive Loss - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Statement of Comprehensive Income [Abstract]	'	'	'	'
Accumulated other comprehensive loss, tax	$0	$0	$0	$0
Amounts reclassified to earnings from accumulated other comprehensive loss	$0	$0	$0	$0

Earnings_Per_Share_Additional_

Earnings Per Share - Additional Information (Detail)

0 Months Ended

9 Months Ended

3 Months Ended

9 Months Ended

3 Months Ended

9 Months Ended

0 Months Ended

Mar. 20, 2014

Mar. 11, 2014

Sep. 30, 2014

Sep. 30, 2013

Feb. 06, 2013

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2013

Feb. 06, 2013

Sep. 09, 2013

Incentive Stock Option [Member]

Incentive Stock Option [Member]

Incentive Stock Option [Member]

Incentive Stock Option [Member]

Restricted Stock Units (RSUs) [Member]

Restricted Stock Units (RSUs) [Member]

Restricted Stock Units (RSUs) [Member]

Restricted Stock Units (RSUs) [Member]

IPO [Member]

Secondary Public Offering [Member]

Net Income Loss Per Common Share [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Conversion ratio of common units in former limited liability company into common shares

'

'

'

0.58

'

'

'

'

'

'

'

'

'

'

'

Conversion ratio of preferred shares into common shares

'

'

'

'

9.5

'

'

'

'

'

'

'

'

'

'

New common shares issuances

'

'

'

'

'

'

'

'

'

'

'

'

'

5,483,333

1,106,000

Restricted stock, vested

'

10,000

'

'

'

'

'

'

'

'

'

'

'

'

'

Common stock issued

5,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Common stock issued related to employee stock option exercises

'

'

17,696

'

'

'

'

'

'

'

'

'

'

'

'

Potential shares of anti-dilutive common stock

'

'

'

'

'

153,970

175,000

153,970

175,000

25,834

20,000

25,834

20,000

'

'

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		9 Months Ended
In Thousands, except Share data, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Earnings Per Share [Abstract]	'	'	'	'
Net loss attributable to ExOne	($4,451)	($224)	($14,643)	($3,258)
Less: Preferred stock dividends declared	'	'	'	-152
Net loss available to ExOne common shareholders	($4,451)	($224)	($14,643)	($3,410)
Weighted average shares outstanding (basic and diluted)	14,416,970	13,534,065	14,408,871	12,316,096
Net loss attributable to ExOne per common share:	'	'	'	'
Basic	($0.31)	($0.02)	($1.02)	($0.28)
Diluted	($0.31)	($0.02)	($1.02)	($0.28)

Acquisitions_Additional_Inform

Acquisitions - Additional Information (Detail)

9 Months Ended

0 Months Ended

3 Months Ended

9 Months Ended

12 Months Ended

9 Months Ended

0 Months Ended

3 Months Ended

9 Months Ended

12 Months Ended

0 Months Ended

In Thousands, unless otherwise specified

Sep. 30, 2014

Sep. 30, 2013

Dec. 31, 2013

Mar. 03, 2014

Sep. 30, 2014

Sep. 30, 2014

Dec. 31, 2013

Mar. 03, 2014

Sep. 30, 2014

Mar. 06, 2014

Mar. 06, 2014

Sep. 30, 2014

Sep. 30, 2014

Dec. 31, 2013

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]

MAM Corporation [Member]

MAM Corporation [Member]

MAM Corporation [Member]

MWT Corporation [Member]

MWT Corporation [Member]

MWT 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 ($)

Customer Relationships [Member]

USD ($)

EUR (€)

USD ($)

USD ($)

USD ($)

USD ($)

EUR (€)

USD ($)

USD ($)

USD ($)

USD ($)

Business Acquisition [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Purchase price

'

'

'

'

'

'

'

$4,995

'

'

'

'

'

'

$4,891

€ 3,557

'

'

'

'

Purchase price in cash

'

'

'

4,618

'

'

'

'

'

4,813

3,500

'

'

'

'

'

'

'

'

'

Purchase price in contingent consideration

'

'

'

'

'

'

'

377

'

'

'

'

'

'

'

'

'

'

'

'

Number of year for earn out provision

'

'

'

'2 years

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Goodwill deductible for income tax purpose

'

'

'

'

2,261

2,261

'

'

'

'

'

0

0

'

'

'

'

'

'

'

Assignment of goodwill

'

'

'

'

'

0

'

'

'

'

'

'

0

'

'

'

'

'

'

'

Amortized of preliminary allocation

'

'

'

'

'

'

'

'

'5 years

'

'

'

'

'

'

'

'

'

'

'

Adjustments associated with revisions to initial estimates of net working capital

'

'

'

'

9

-41

'

'

'

'

'

-46

-52

'

'

'

'

'

'

'

Gain or loss on extinguishment of debt

'

'

'

'

'

0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Acquisition-related expenses

'

'

'

88

'

76

12

'

'

143

'

'

138

5

'

'

'

'

'

'

Purchase price in other net liabilities

'

'

'

'

'

'

'

'

'

78

57

'

'

'

'

'

'

'

'

'

Change in fair value

-194

'

'

'

3

194

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Reduction in accrued expenses and other current liabilities

'

'

'

'

'

200

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Increase to other noncurrent liabilities

'

'

'

'

'

6

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Payments to acquire assets, including property and equipment

18,586

9,822

'

'

'

'

'

'

'

'

'

'

'

'

'

'

1,900

200

'

'

Repayment of outstanding debt

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

4,700

'

Return of capital

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

1,400

'

Property plant and equipment, Carrying value

'

'

'

'

'

'

'

2,491

'

'

'

'

'

'

25

'

'

'

'

5,400

Reduction to equity through noncontrolling interest

'

2,724

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

2,724

'

Goodwill arising from acquisition

$6,820

'

'

'

'

'

'

$2,261

'

'

'

'

'

'

$4,842

'

'

'

'

$0

Acquisitions_Preliminary_Alloc

Acquisitions - Preliminary Allocation of Purchase Price (Detail)	Sep. 30, 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	'	'	222	1	'
Inventories	'	'	246	525	'
Prepaid expenses and other current assets	'	'	15	29	'
Property and equipment	'	'	2,491	25	'
Intangible assets	'	'	200	'	'
Goodwill	6,820	'	2,261	4,842	'
Total assets	'	'	5,435	5,623	'
Accounts payable	'	'	49	127	'
Accrued expenses and other current liabilities	'	'	53	605	'
Long-term debt	'	'	338	'	'
Total liabilities	'	'	440	732	'
Total purchase price	'	'	$4,995	$4,891	€ 3,557

Acquisitions_Schedule_of_Chang

Acquisitions - Schedule of Changes in Carrying Value of Goodwill (Detail) (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014
Business Combination Increase Decrease To Reflect Liabilities Acquired At Fair Value [Abstract]	'
Balance at December 31, 2013	'
Acquisition of businesses	7,196
Foreign currency translation adjustments	-376
Balance at September 30, 2014	$6,820

Inventories_Schedule_of_Invent

Inventories - Schedule of Inventories (Detail) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Inventory Disclosure [Abstract]	'	'
Raw materials and components	$9,849	$6,253
Work in process	7,966	5,957
Finished goods	346	554
Inventories	$18,161	$12,764

Inventories_Additional_Informa

Inventories - Additional Information (Detail) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Inventory Disclosure [Abstract]	'	'
Allowance for slow-moving and obsolete inventories	$731	$750

Line_of_Credit_Additional_Info

Line of Credit - Additional Information (Detail)

9 Months Ended

12 Months Ended

9 Months Ended

9 Months Ended

In Thousands, unless otherwise specified

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Sep. 30, 2014

Dec. 31, 2013

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

USD ($)

USD ($)

EUR (€)

Overdrafts [Member]

Overdrafts [Member]

Security Agreement [Member]

Security Agreement [Member]

Security Agreement [Member]

Security Agreement [Member]

Short-Term Borrowings [Member]

Short-Term Borrowings [Member]

Overdraft [Member]

Transactions Security [Member]

Compensating Cash Balance [Member]

Compensating Cash Balance [Member]

USD ($)

USD ($)

USD ($)

EUR (€)

USD ($)

EUR (€)

USD ($)

USD ($)

Security Agreement [Member]

Security Agreement [Member]

USD ($)

EUR (€)

Line of Credit Facility [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Line of credit and security agreement amount

$1,600

'

€ 1,300

'

'

'

'

'

'

'

'

'

'

'

'

Cash available for short-term borrowings or cash advances (overdrafts)

600

'

500

'

'

'

'

'

'

'

'

'

'

'

'

Credit facility, outstanding amount

'

'

'

0

0

1,908

1,504

982

713

0

0

'

'

989

780

Amount available for additional bank transactions requiring security

1,000

'

800

'

'

'

'

'

'

'

'

'

'

'

'

Commitment fee

$0

$0

'

'

'

'

'

'

'

'

'

'

'

'

'

Interest rate

'

'

'

'

'

'

'

'

'

2.33%

'

6.20%

1.75%

'

'

Income_Taxes_Additional_Inform

Income Taxes - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Schedule Of Income Taxes [Line Items]	'	'	'	'	'
Provision for income taxes	$107	$439	$274	$530	'
Effective tax rate	2.50%	204.20%	1.90%	20.50%	'
U.S. federal statutory rate	34.00%	34.00%	34.00%	34.00%	'
Liability for uncertain tax positions	708	'	708	'	768
ExOne GmbH (Germany) [Member]	'	'	'	'	'
Schedule Of Income Taxes [Line Items]	'	'	'	'	'
Provision for income taxes	107	439	274	530	'
Liability for uncertain tax positions	260	'	260	'	'
ExOne KK (Japan) [Member]	'	'	'	'	'
Schedule Of Income Taxes [Line Items]	'	'	'	'	'
Liability for uncertain tax positions	$94	'	$94	'	$93

EquityBased_Compensation_Addit

Equity-Based Compensation - Additional Information (Detail) (USD $)

9 Months Ended

0 Months Ended

0 Months Ended

3 Months Ended

9 Months Ended

0 Months Ended

In Thousands, except Share data, unless otherwise specified

Sep. 30, 2014

Sep. 30, 2013

Mar. 20, 2014

Dec. 31, 2013

Mar. 20, 2014

Jan. 02, 2014

Sep. 30, 2014

Mar. 20, 2014

Jan. 02, 2014

Jan. 02, 2014

Mar. 31, 2014

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Jan. 24, 2013

Jan. 24, 2013

Jan. 24, 2013

Restricted Stock [Member]

Restricted Stock [Member]

Restricted Stock [Member]

Restricted Stock [Member]

Restricted Stock [Member]

Restricted Stock [Member]

ISOs [Member]

ISOs [Member]

ISOs [Member]

Unvested ISOs [Member]

2013 Equity Incentive Plan [Member]

2013 Equity Incentive Plan [Member]

2013 Equity Incentive Plan [Member]

Executives

Executives

Executive Officer [Member]

Executive Officer [Member]

Maximum [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%

'

'

Number of Shares authorized

200,000,000

'

'

200,000,000

'

'

'

'

'

'

'

'

'

'

'

'

1,992,242

Common stock in the form of stock bonus

'

'

5,000

'

'

'

'

5,000

'

7,500

'

'

'

'

'

'

'

Awards vesting during anniversaries of grand date

'

'

'

'

'These awards vest in one-third increments on the first, second and third anniversaries of the grant date

'

'

'

'These awards vest in one-third increments on the first, second and third anniversaries of the grant date

'

'

'

'

'

'

'

'

Number of executives of the company

'

'

'

'

1

3

'

'

'

'

'

'

'

'

'

'

'

Total future compensation expense

'

'

'

'

'

'

$729

'

'

'

'

$844

'

'

'

'

'

Weighted-average remaining vesting period

'1 year 8 months 12 days

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Aggregate intrinsic value

'

'

'

'

'

'

'

'

'

'

'

303

'

117

'

'

'

Weighted average remaining contractual term

'

'

'

'

'

'

'

'

'

'

'

'8 years 4 months 24 days

'

'

'

'

'

Intrinsic value of ISOs exercised by employee

'

'

'

'

'

'

'

'

'

'

306

'

'

'

'

'

'

Proceeds from exercise of stock options

318

'

'

'

'

'

'

'

'

'

318

'

'

'

'

'

'

Income tax benefit

'

'

'

'

'

'

'

'

'

'

'

$0

'

'

'

'

'

Number of stock exercise

17,696

'

'

'

'

'

'

'

'

'

'

0

0

'

'

'

'

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		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Equity-based compensation expense recognized:	'	'	'	'
Total equity-based compensation expense before income taxes	$250	$200	$943	$511
Benefit for income taxes	'	'	'	'
Total equity-based compensation expense net of income taxes	250	200	943	511
ISOs [Member]	'	'	'	'
Equity-based compensation expense recognized:	'	'	'	'
Total equity-based compensation expense before income taxes	156	161	475	418
Restricted Stock [Member]	'	'	'	'
Equity-based compensation expense recognized:	'	'	'	'
Total equity-based compensation expense before income taxes	94	39	271	93
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) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]	'	'	'	'
Benefit for income taxes from equity-based compensation	'	'	'	'
Valuation Allowance [Member]	'	'	'	'
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]	'	'	'	'
Benefit for income taxes from equity-based compensation	'	'	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	$53	$34	$222	$85

EquityBased_Compensation_Summa2

Equity-Based Compensation - Summary of Activity for ISOs (Detail) (USD $)	9 Months Ended
	Sep. 30, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]	'
Number of ISOs, outstanding, Beginning Balance	173,333
Number of ISOs, granted	'
Number of ISOs, exercised	-17,696
Number of ISOs, forfeited	-1,667
Number of ISOs, outstanding, Ending Balance	153,970
Number of ISOs, exercisable	40,637
Number of ISOs, expected to vest, net of forfeitures	104,975
Weighted Average Exercise Price, Beginning Balance	$18
Weighted Average Exercise Price, ISOs granted	'
Weighted Average Exercise Price, ISOs exercised	$18
Weighted Average Exercise Price, ISOs forfeited	'
Weighted Average Exercise Price, Ending Balance	$18
Weighted Average Exercise Price, ISOs exercisable	$18
Weighted Average Exercise Price, ISOs expected to vest, net of forfeitures	$18
Weighted Average Grant Date Fair Value, Beginning Balance	$11.03
Weighted Average Grant Date Fair Value, ISOs granted	'
Weighted Average Grant Date Fair Value, ISOs exercised	$11.03
Weighted Average Grant Date Fair Value, ISOs forfeited	'
Weighted Average Grant Date Fair Value, Ending Balance	$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	$11.03

EquityBased_Compensation_Summa3

Equity-Based Compensation - Summary of Activity for Restricted Stock Awards (Detail) (Restricted Stock [Member], USD $)	9 Months Ended
	Sep. 30, 2014
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	12,500
Number of Restricted Shares, vested	-6,666
Number of Restricted Shares, forfeited	'
Number of Restricted Shares, outstanding, Ending Balance	25,834
Number of Restricted Shares, expected to vest	25,834
Weighted Average Grant Date Fair Value, Beginning Balance	$23.26
Weighted Average Grant Date Fair Value, granted	$53.28
Weighted Average Grant Date Fair Value, vested	$23.26
Weighted Average Grant Date Fair Value, forfeited	'
Weighted Average Grant Date Fair Value, Ending Balance	$37.78
Weighted Average Grant Date Fair Value, expected to vest	$37.78

EquityBased_Compensation_Summa4

Equity-Based Compensation - Summary of Activity for Restricted Stock Awards (Parenthetical) (Detail) (Restricted Stock [Member], USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014
Restricted Stock [Member]	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'
Fair value of restricted shares vesting	$282

Fair_Value_Measurements_Fair_V

Fair Value Measurements - Fair Value of Liabilities Measured on Recurring Basis (Detail) (Fair Value, Inputs, Level 3 [Member], USD $)	Sep. 30, 2014	Dec. 31, 2013
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	'	'
Other noncurrent liabilities, MAM contingent consideration	$183	'

Fair_Value_Measurements_Minimu

Fair Value Measurements - Minimum Achievement of Revenues and Gross Profit (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Schedule Of Earn Out Of Required Minimum Achievement Of Revenues And Gross Profit [Line Items]	'	'	'	'
Revenue	$9,649	$11,621	$28,135	$28,785
Gross profit	2,487	5,251	6,602	12,270
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])	9 Months Ended
	Sep. 30, 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 $)	9 Months Ended		3 Months Ended	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2014
			MAM Corporation [Member]	MAM Corporation [Member]
Change in fair value	($194)	'	$3	$194
Reduction in accrued expenses and other current liabilities	'	'	'	200
Increase to other noncurrent liabilities	'	'	'	$6

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 $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Fair Value, Inputs, Level 3 [Member]	'	'	'	'
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]	'	'	'	'
Beginning balance	$180	'	'	'
Purchases	'	'	'	'
Sales	'	'	'	'
Issuances	'	'	377	'
Settlements	'	'	'	'
Realized (gains) losses	'	'	-200	'
Unrealized (gains) losses	3	'	6	'
Transfers into Level 3	'	'	'	'
Transfers out of Level 3	'	'	'	'
Ending balance	$183	'	$183	'

Fair_Value_Measurements_Carryi

Fair Value Measurements - Carrying Values and Fair Values of Other Financial Instruments (Detail) (USD $)	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'	'	'
Cash and cash equivalents	$45,206	$98,445	$115,144	$2,802
Current portion of long-term debt	131	127	'	'
Current portion of capital and financing leases	427	549	'	'
Long-term debt - net of current portion	1,983	2,082	'	'
Capital and financing leases - net of current portion	232	475	'	'
Carrying Value [Member]	'	'	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'	'	'
Cash and cash equivalents	45,206	98,445	'	'
Current portion of long-term debt	131	127	'	'
Current portion of capital and financing leases	427	549	'	'
Long-term debt - net of current portion	1,983	2,082	'	'
Capital and financing leases - net of current portion	232	475	'	'
Fair Value [Member]	'	'	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'	'	'
Cash and cash equivalents	45,206	98,445	'	'
Current portion of long-term debt	131	127	'	'
Current portion of capital and financing leases	427	549	'	'
Long-term debt - net of current portion	2,040	1,666	'	'
Capital and financing leases - net of current portion	$232	$475	'	'

Customer_Concentrations_Additi

Customer Concentrations - Additional Information (Detail) (Five Most Significant Customers [Member], USD $)	0 Months Ended		3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
	Customer	Customer	Customer	Customer	Customer	Customer
Revenue, Major Customer [Line Items]	'	'	'	'	'	'
Accounts receivable from significant customers	6,396	5,912	6,396	'	6,396	'
Sales Revenue, Net [Member]	'	'	'	'	'	'
Revenue, Major Customer [Line Items]	'	'	'	'	'	'
Number of customers	5	5	5	5	5	5
Revenue concentration, by largest customer	'	'	43.60%	60.30%	27.20%	31.40%