ExOne (XONE) 10-Q 7 Aug 19 2019 Q2 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	6 Months Ended
	Jun. 30, 2019	Aug. 07, 2019
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2019
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q2
Trading Symbol	XONE
Entity Registrant Name	ExOne Co
Entity Central Index Key	0001561627
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	false
Entity Common Stock, Shares Outstanding		16,414,411
Document Quarterly Report	true
Document Transition Report	false
Entity Interactive Data Current	Yes
Entity Current Reporting Status	Yes
Entity Shell Company	false
Title of 12(b) Security	Common stock
Security Exchange Name	NASDAQ
Entity File Number	001-35806
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	46-1684608
Entity Address, Address Line One	127 Industry Boulevard
Entity Address, City or Town	North Huntingdon
Entity Address, State or Province	PA
Entity Address, Postal Zip Code	15642
City Area Code	724
Local Phone Number	863-9663

Condensed Statement of Consolid

Condensed Statement of Consolidated Operations and Comprehensive Loss - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Income Statement [Abstract]
Revenue	$ 15,279	$ 10,857	$ 24,858	$ 22,750
Cost of sales	10,137	9,267	17,074	18,544
Gross profit	5,142	1,590	7,784	4,206
Operating expenses
Research and development	2,537	3,235	4,969	6,030
Selling, general and administrative	6,167	6,353	11,590	12,555
Total operating expenses	8,704	9,588	16,559	18,585
Loss from operations	(3,562)	(7,998)	(8,775)	(14,379)
Other expense (income)
Interest expense	71	73	142	106
Other expense (income) ̶ net	57	(52)	69	(98)
Total other expense (income)	128	21	211	8
Loss before income taxes	(3,690)	(8,019)	(8,986)	(14,387)
Provision (benefit) for income taxes	99	18	(701)	35
Net loss	$ (3,789)	$ (8,037)	$ (8,285)	$ (14,422)
Net loss per common share:
Basic	$ (0.23)	$ (0.50)	$ (0.51)	$ (0.89)
Diluted	$ (0.23)	$ (0.50)	$ (0.51)	$ (0.89)
Comprehensive loss:
Net loss	$ (3,789)	$ (8,037)	$ (8,285)	$ (14,422)
Other comprehensive income (loss):
Foreign currency translation adjustments	583	(2,240)	(193)	(838)
Comprehensive loss	$ (3,206)	$ (10,277)	$ (8,478)	$ (15,260)

Condensed Consolidated Balance

Condensed Consolidated Balance Sheet - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 5,462	$ 7,592
Restricted cash	1,790	1,548
Accounts receivable ̶ net	4,667	6,393
Current portion of net investment in sales-type leases	293	302
Inventories ̶ net	16,183	15,930
Prepaid expenses and other current assets	2,736	2,438
Total current assets	31,131	34,203
Property and equipment ̶ net	40,879	41,906
Net investment in sales-type leases ̶ net of current portion	1,204	1,351
Other noncurrent assets	484	222
Total assets	73,698	77,682
Current liabilities:
Current portion of long-term debt	149	144
Accounts payable	5,339	4,376
Accrued expenses and other current liabilities	4,525	6,049
Current portion of contract liabilities	6,204	2,343
Total current liabilities	16,217	12,912
Long-term debt ̶ net of current portion	1,288	1,364
Contract liabilities ̶ net of current portion	341	527
Other noncurrent liabilities	280	104
Total liabilities	18,126	14,907
Contingencies and commitments
Stockholders' equity
Common stock, $0.01 par value, 200,000,000 shares authorized, 16,318,147 (2019) and 16,234,201 (2018) shares issued and outstanding	163	162
Additional paid-in capital	176,488	175,214
Accumulated deficit	(110,138)	(101,853)
Accumulated other comprehensive loss	(10,941)	(10,748)
Total stockholders' equity	55,572	62,775
Total liabilities and stockholders' equity	$ 73,698	$ 77,682

Condensed Consolidated Balanc_2

Condensed Consolidated Balance Sheet (Parenthetical) - $ / shares	Jun. 30, 2019	Dec. 31, 2018
Statement Of Financial Position [Abstract]
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	200,000,000	200,000,000
Common stock, shares issued	16,318,147	16,234,201
Common stock, shares outstanding	16,318,147	16,234,201

Condensed Statement of Consol_2

Condensed Statement of Consolidated Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Operating activities
Net loss	$ (8,285)	$ (14,422)
Adjustments to reconcile net loss to net cash used for operations:
Depreciation and amortization	2,349	2,829
Equity-based compensation	1,081	374
Amortization of debt issuance costs	47	27
Recoveries for bad debts ̶ net	(150)	(37)
(Recoveries) provision for slow-moving, obsolete and lower of cost or net realizable value inventories ̶ net	(27)	771
Gain from disposal of property and equipment ̶ net	(2)	(41)
Changes in assets and liabilities, excluding effects of foreign currency translation adjustments:
Decrease in accounts receivable	1,879	3,661
Decrease in net investment in sales-type leases	153	102
Increase in inventories	(1,167)	(7,060)
Increase in prepaid expenses and other assets	(221)	(658)
Increase in accounts payable	927	445
(Decrease) increase in accrued expenses and other liabilities	(1,689)	730
Increase in contract liabilities	3,608	5,406
Net cash used for operating activities	(1,497)	(7,873)
Investing activities
Capital expenditures	(423)	(819)
Proceeds from sale of property and equipment	3	25
Net cash used for investing activities	(420)	(794)
Financing activities
Payments on long-term debt	(74)	(70)
Proceeds from exercise of employee stock options	171
Taxes related to the net share settlement of equity-based awards	(68)	0
Debt issuance costs		(188)
Other	(7)	(9)
Net cash provided by (used for) financing activities	22	(267)
Effect of exchange rate changes on cash, cash equivalents, and restricted cash	7	(197)
Net change in cash, cash equivalents, and restricted cash	(1,888)	(9,131)
Cash, cash equivalents, and restricted cash at beginning of period	9,140	22,178
Cash, cash equivalents, and restricted cash at end of period	7,252	13,047
Supplemental disclosure of noncash investing and financing activities
Transfer of internally developed 3D printing machines from inventories to property and equipment for internal use or leasing activities	1,066	895
Transfer of internally developed 3D printing machines from property and equipment to inventories for sale	182	424
Property and equipment included in accounts payable	110	95
Property and equipment included in accrued expenses and other current liabilities	48	23
Property and equipment acquired through financing arrangements		14
Unsettled proceeds from sale of property and equipment		51
Unsettled proceeds from exercise of employee stock options	$ 91
Debt issuance costs included in accrued expenses and other current liabilities		$ 76

Condensed Statement of Changes

Condensed Statement of Changes in Consolidated Stockholders' Equity (Unaudited) - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Deficit [Member]	Accumulated Other Comprehensive Loss [Member]
Beginning Balance at Dec. 31, 2017	$ 75,209	$ 161	$ 173,718	$ (89,186)	$ (9,484)
Beginning Balance, Shares at Dec. 31, 2017		16,125,000
Net loss	(6,385)			(6,385)
Other comprehensive income (loss)	1,402				1,402
Equity-based compensation	379		379
Common stock issued from equity incentive plan, shares		25,000
Ending Balance at Mar. 31, 2018	70,605	$ 161	174,097	(95,571)	(8,082)
Ending Balance, Shares at Mar. 31, 2018		16,150,000
Beginning Balance at Dec. 31, 2017	75,209	$ 161	173,718	(89,186)	(9,484)
Beginning Balance, Shares at Dec. 31, 2017		16,125,000
Net loss	$ (14,422)
Exercise of employee stock options, shares	0
Ending Balance at Jun. 30, 2018	$ 60,323	$ 161	174,092	(103,608)	(10,322)
Ending Balance, Shares at Jun. 30, 2018		16,150,000
Beginning Balance at Mar. 31, 2018	70,605	$ 161	174,097	(95,571)	(8,082)
Beginning Balance, Shares at Mar. 31, 2018		16,150,000
Net loss	(8,037)			(8,037)
Other comprehensive income (loss)	(2,240)				(2,240)
Equity-based compensation	(5)		(5)
Ending Balance at Jun. 30, 2018	60,323	$ 161	174,092	(103,608)	(10,322)
Ending Balance, Shares at Jun. 30, 2018		16,150,000
Beginning Balance at Dec. 31, 2018	$ 62,775	$ 162	175,214	(101,853)	(10,748)
Beginning Balance, Shares at Dec. 31, 2018	16,234,201	16,234,000
Net loss	$ (4,496)			(4,496)
Other comprehensive income (loss)	(776)				(776)
Equity-based compensation	439		439
Exercise of employee stock options	165	$ 1	164
Exercise of employee stock options, shares		23,000
Taxes related to the net share settlement of equity-based awards	(68)		(68)
Common stock issued from equity incentive plan, shares		38,000
Ending Balance at Mar. 31, 2019	58,039	$ 163	175,749	(106,349)	(11,524)
Ending Balance, Shares at Mar. 31, 2019		16,295,000
Beginning Balance at Dec. 31, 2018	$ 62,775	$ 162	175,214	(101,853)	(10,748)
Beginning Balance, Shares at Dec. 31, 2018	16,234,201	16,234,000
Net loss	$ (8,285)
Exercise of employee stock options, shares	36,370
Ending Balance at Jun. 30, 2019	$ 55,572	$ 163	176,488	(110,138)	(10,941)
Ending Balance, Shares at Jun. 30, 2019	16,318,147	16,318,000
Beginning Balance at Mar. 31, 2019	$ 58,039	$ 163	175,749	(106,349)	(11,524)
Beginning Balance, Shares at Mar. 31, 2019		16,295,000
Net loss	(3,789)			(3,789)
Other comprehensive income (loss)	583				583
Equity-based compensation	642		642
Exercise of employee stock options	97		97
Exercise of employee stock options, shares		13,000
Common stock issued from equity incentive plan, shares		10,000
Ending Balance at Jun. 30, 2019	$ 55,572	$ 163	$ 176,488	$ (110,138)	$ (10,941)
Ending Balance, Shares at Jun. 30, 2019	16,318,147	16,318,000

Basis of Presentation

Basis of Presentation	6 Months Ended
	Jun. 30, 2019
Accounting Policies [Abstract]
Basis of Presentation	Note 1. Basis of Presentation Organization The ExOne Company (“ExOne”) is a corporation organized under the laws of the state of Delaware. ExOne was formed on January 1, 2013, when The Ex One Company, LLC, a Delaware limited liability company, merged with and into a Delaware corporation, which survived and changed its name to The ExOne Company (the “Reorganization”). As a result of the Reorganization, The Ex One Company, LLC became ExOne, the common and preferred interest holders of The Ex One Company, LLC became holders of common stock and preferred stock, respectively, of ExOne, and the subsidiaries of The Ex One Company, LLC became the subsidiaries of ExOne. The condensed consolidated financial statements include the accounts of ExOne, its wholly-owned subsidiaries, ExOne Americas LLC (United States); ExOne GmbH (Germany); ExOne Property GmbH (Germany); ExOne KK (Japan); and through December 2018, ExOne Italy S.r.l (Italy). Collectively, the consolidated group is referred to as the “Company”. The Company filed a registration statement on Form S-3 (No. 333-223690) with the Securities and Exchange Commission (“SEC”) on March 15, 2018. The purpose of the Form S-3 was to register, among other securities, debt securities. Subsidiaries of the Company are co-registrants with the Company (“Subsidiary Guarantors”), and the registration statement registered guarantees of debt securities by one or more of the Subsidiary Guarantors. The Subsidiary Guarantors are 100% owned by the Company and any guarantees by the Subsidiary Guarantors will be full and unconditional. There have been no transactions undertaken subject to the Form S-3 since its initial filing. Basis of Presentation 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, 2018 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, 2018, which includes all disclosures required by GAAP. The preparation of these condensed consolidated financial statements requires the Company to make certain judgments, estimates and assumptions regarding uncertainties that affect the reported amounts of assets, liabilities, revenue and expenses and related disclosure of contingent assets and liabilities. Areas that require significant judgments, estimates and assumptions include accounting for accounts receivable (including the allowance for doubtful accounts); inventories (including the allowance for slow-moving and obsolete inventories); product warranty reserves; contingencies; income taxes (including the valuation allowance on certain deferred tax assets and liabilities for uncertain tax positions); equity-based compensation (including the valuation of certain equity-based compensation awards issued by the Company); and testing for impairment of long-lived assets (including the identification of asset groups by management, estimates of future cash flows of identified asset groups and fair value estimates used in connection with assessing the valuation of identified asset groups). The Company bases its estimates on historical experience and on various other assumptions that are believed to be reasonable, the results of which form the basis for making judgments about the carrying values of assets and liabilities that are not readily apparent from other sources. Actual results may differ from these estimates. Certain amounts relating to contract liabilities – net of current portion ($527) in the accompanying condensed consolidated balance sheet at December 31, 2018, have been reclassified from other noncurrent liabilities to conform to current period presentation, following the adoption of Financial Accounting Standards Board (“FASB”) Accounting Standards Update (“ASU”) 2014-09 (further described below). Certain amounts relating to the lessor current portion of net investment in sales-type leases ($302) and lessor net investment in sales-type leases – net of current portion ($1,351) in the accompanying condensed consolidated balance sheet at December 31, 2018, have been reclassified from accounts receivable and other noncurrent assets, respectively, to conform to current period presentation following the adoption of FASB ASU 2016-02 (further described below). Related to the reclassifications further described above, amounts within the condensed statement of consolidated cash flows for the six months ended June 30, 2018 associated with these changes have also been reclassified to conform to current period presentation. Recently Adopted Accounting Guidance On January 1, 2019, the Company adopted FASB ASU 2014-09, “Revenue from Contracts with Customers.” This ASU created a comprehensive framework for all entities in all industries to apply in the determination of when to recognize revenue and, therefore, supersedes virtually all existing revenue recognition requirements and guidance. This framework is expected to provide a consistent and comparable methodology for revenue recognition. The core principle of the guidance is that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. To achieve this principle, an entity should apply the following steps: identify the On January 1, 2019, the Company adopted FASB ASU 2016-02, “Leases.” This ASU requires lessees to recognize a right-of-use asset and lease liability on the consolidated balance sheet for leases classified as operating leases. For leases with a term of 12 months or less, a lessee is permitted to make an accounting policy election by class of underlying asset not to recognize a right-of-use asset and lease liability. Additionally, when measuring assets and liabilities arising from a lease, optional payments should be included only if the lessee is reasonably certain to exercise an option to extend the lease, exercise a purchase option, or not exercise an option to terminate the lease. A right-of-use asset represents an entity’s right to use the underlying asset for the lease term, and a lease liability represents an entity’s obligation to make lease payments. Currently, an asset and liability only are recorded for leases classified as capital leases (financing leases). The measurement, recognition, and presentation of expenses and cash flows arising from leases by a lessee remains the same. In connection with the adoption of this guidance, the Company has completed an assessment resulting in an accumulation of all of its leasing arrangements and has validated the information for accuracy and completeness. Upon adoption of the new lease guidance, management recorded a right-of-use asset and lease liability, each in the amount of approximately $400, on the Company’s consolidated balance sheet for various types of operating leases, including certain machinery and other equipment and vehicles. This amount is equivalent to the aggregate future minimum lease payments on a discounted basis. The Company has also elected to apply the package of transitional practical expedients of the new lease guidance by allowing the Company to not: (1) reassess if expired or existing contracts are, or contain, leases; (2) reassess lease classification for any expired or existing leases; and (3) reassess initial direct costs for any existing leases. Additionally, in July 2018, the FASB issued guidance to provide for an alternative transition method to the new lease guidance, whereby an entity can choose to not reflect the impact of the new lease guidance in the prior periods included in its consolidated financial statements. The Company has utilized this alternative transition method in connection with its adoption on January 1, 2019. The Company has included the enhanced disclosures required by this guidance in its condensed consolidated financial statements (Note 11). On January 1, 2019, the Company adopted FASB ASU 2016-15, “Statement of Cash Flows: Classification of Certain Cash Receipts and Cash Payments.” This ASU is intended to reduce diversity in practice in how certain cash receipts and payments are presented and classified in the statement of consolidated cash flows. The standard provides guidance in a number of situations including, among others, settlement of zero-coupon bonds, contingent consideration payments made after a business combination, proceeds from the settlement of insurance claims, and distributions received from equity method investees. The ASU also provides guidance for classifying cash receipts and payments that have aspects of more than one class of cash flows. The adoption of this ASU did not have an effect on the consolidated financial statements of the Company . Recently Issued Accounting Guidance The Company considers the applicability and impact of all ASUs issued by the FASB. Recently issued ASUs not listed below either were assessed and determined to be not applicable or are currently expected to have no impact on the consolidated financial statements of the Company. In June 2016, the FASB issued ASU 2016-13, “Financial Instruments – Credit Losses.” This ASU added a new impairment model (known as the current expected credit loss (“CECL”) model) that is based on expected losses rather than incurred losses. Under the new guidance, an entity recognizes as an allowance its estimate of expected credit losses. The CECL model applies to most debt instruments, trade receivables, lease receivables, financial guarantee contracts, and other loan commitments. The CECL model does not have a minimum threshold for recognition of impairment losses and entities will need to measure expected credit losses on assets that have a low risk of loss. These changes become effective for the Company on January 1, 2020. Management is currently evaluating the potential impact of these changes on the consolidated financial statements of the Company.

Liquidity

Liquidity	6 Months Ended
	Jun. 30, 2019
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Liquidity	Note 2. Liquidity The Company has incurred a net loss in each of its annual periods since its inception. As shown in the accompanying condensed statement of consolidated operations and comprehensive loss, the Company incurred a net loss of approximately $3,789 and $8,285 for the three months and six months ended June 30, 2019, respectively. At June 30, 2019, the Company had approximately $5,462 in unrestricted cash and cash equivalents. Since its inception the Company has received cumulative unrestricted net proceeds from the sale of its common stock (through its initial public offering and subsequent secondary offerings) of approximately $168,361 to fund its operations. In March 2018, the Company entered into a three-year, $15,000 revolving credit facility with a related party (Note 13) to provide additional funding for working capital and general corporate purposes. In June 2018, the Company initiated a 2018 global cost realignment program focused on a reduction in the Company’s production overhead costs and operating expenses in an effort to drive efficiency in its operations and preserve capital. Management believes that the Company’s existing capital resources will be sufficient to support the Company’s operating plan. If management anticipates that the Company’s actual results will differ from its operating plan, management believes it has sufficient capabilities to enact cost savings measures to preserve capital (in addition to the costs savings measures associated with the Company’s 2018 global cost realignment program further described above). The Company may also seek to raise additional capital to support its growth through additional debt, equity or other alternatives (including asset sales) or a combination thereof.

Accumulated Other Comprehensive

Accumulated Other Comprehensive Loss	6 Months Ended
	Jun. 30, 2019
Equity [Abstract]
Accumulated Other Comprehensive Loss	Note 3. Accumulated Other Comprehensive Loss The following table summarizes changes in the components of accumulated other comprehensive loss for the periods indicated: Three Months Ended Six Months Ended June 30, June 30, 2019 2018 2019 2018 Foreign currency translation adjustments Balance at beginning of period $ (11,524 ) $ (8,082 ) $ (10,748 ) $ (9,484 ) Other comprehensive income (loss) 583 (2,240 ) (193 ) (838 ) Balance at end of period $ (10,941 ) $ (10,322 ) $ (10,941 ) $ (10,322 ) Foreign currency translation adjustments consist of the effect of translation of functional currency financial statements (denominated in the euro and Japanese yen) to the reporting currency of the Company (United States dollar) and certain long-term intercompany transactions between subsidiaries for which settlement is not planned or anticipated in the foreseeable future. There were no tax impacts related to income tax rate changes and no amounts were reclassified to earnings for either of the periods presented.

Loss Per Share

Loss Per Share	6 Months Ended
	Jun. 30, 2019
Earnings Per Share [Abstract]
Loss Per Share	Note 4. Loss Per Share The Company presents basic and diluted loss per common share amounts. Basic loss per common share is calculated by dividing net loss available to common stockholders by the weighted average number of common shares outstanding during the applicable period. Diluted loss per common share is calculated by dividing net loss available to common stockholders by the weighted average number of common shares and common equivalent shares outstanding during the applicable period. As the Company incurred a net loss during each of the three months and six months ended June 30, 2019 and 2018, basic average common shares outstanding and diluted average common shares outstanding were the same because the effect of potential shares of common stock, including stock options (608,787 – 2019 and 536,635 – 2018) and unvested restricted stock issued (96,264 – 2019 and 52,502 – 2018), was anti-dilutive. The information used to compute basic and diluted net loss per common share was as follows for the periods indicated: Three Months Ended Six Months Ended June 30, June 30, 2019 2018 2019 2018 Net loss $ (3,789 ) $ (8,037 ) $ (8,285 ) $ (14,422 ) Weighted average shares outstanding (basic and diluted) 16,301,157 16,149,617 16,278,043 16,144,092 Net loss per common share: Basic $ (0.23 ) $ (0.50 ) $ (0.51 ) $ (0.89 ) Diluted $ (0.23 ) $ (0.50 ) $ (0.51 ) $ (0.89 )

Revenue

Revenue	6 Months Ended
	Jun. 30, 2019
Revenue From Contract With Customer [Abstract]
Revenue	Note 5. Revenue The Company derives revenue from the sale of 3D printing machines and 3D printed and other products, materials and services. Revenue is recognized when the Company satisfies its performance obligation(s) under a contract (either implicit or explicit) by transferring the promised product or service to a customer either when (or as) the customer obtains control of the product or service. A performance obligation is a promise in a contract to transfer a distinct product or service to a customer. A contract’s transaction price is allocated to each distinct performance obligation. Revenue is measured as the amount of consideration the Company expects to receive in exchange for transferring products or providing services. As such, revenue is recorded net of returns, allowances, customer discounts, and incentives. Sales, value add, and other taxes collected from customers and remitted to governmental authorities are accounted for on a net (excluded from revenue) basis. Shipping and handling costs are included in cost of sales. Certain of the Company’s contracts with customers provide for multiple performance obligations. Sales of 3D printing machines may also include optional equipment, materials, replacement components and services (installation, training and other services, including maintenance services and/or an extended warranty). Certain other contracts have a single performance obligation, as the promise to transfer products or services is not separately identifiable from other promises in the contract and, therefore, not distinct. For contracts with multiple performance obligations, the Company allocates the contract’s transaction price to each performance obligation using the Company’s best estimate of stand-alone selling price for each distinct product or service in the contract, which is generally based on an observable price. The Company’s revenue from products is transferred to customers at a point in time. The Company’s contracts for 3D printing machines generally include substantive customer acceptance provisions. Revenue under these contracts is recognized when customer acceptance provisions have been satisfied. For all other product sales, the Company recognizes revenue at the point in time in which the customer obtains control of the product, which is generally when product title passes to the customer upon delivery. In limited cases, title does not transfer and revenue is not recognized until the customer has received the products at its physical location. The Company’s revenue from service arrangements includes deferred maintenance contracts and extended warranties that can be purchased at the customer’s option. The Company generally provides a standard one-year warranty on the Company’s 3D printing machines, which is considered an assurance type warranty, and not considered a separate performance obligation (Note 10). Revenue associated with deferred maintenance contracts is generally recognized at a point in time when the related services are performed where sufficient historical evidence indicates that the costs of performing the related services under the contract are not incurred on a straight-line basis, with such revenue recognized in proportion to the costs expected to be incurred. Revenue associated with extended warranties is generally recognized over time on a straight-line basis over the related contract period. The Company’s revenue from service arrangements includes contracts with the Federal government under fixed-fee, cost reimbursable and time and materials arrangements (certain of which may have periods of performance greater than one year). Revenue under these contracts is generally recognized over time using an input measure based upon labor hours incurred and provisional rates provided under the contracts. As such, the nature of these contracts may give rise to variable consideration, primarily based upon completion of the Company’s annual Incurred Cost Submission filing as required by the Federal government. Historically, amounts associated with variable consideration have not been significant. The Company’s revenue from service arrangements includes certain research and development services. Revenue under research and development service contracts is generally recognized over time using an output measure, specifically units or parts delivered, based upon certain customer acceptance and delivery requirements. Revenue recognized over time using an output measure is not significant. The following table summarizes the Company’s revenue by product group for the periods indicated: Three Months Ended Six Months Ended June 30, June 30, 2019 2018 2019 2018 3D printing machines $ 9,231 $ 3,213 $ 12,560 $ 7,734 3D printed and other products, materials and services 6,048 7,644 12,298 15,016 $ 15,279 $ 10,857 $ 24,858 $ 22,750 Revenue from 3D printing machines includes leasing revenue whereby the Company is the lessor of 3D printing machines to its customers. Leasing revenue is accounted for under ASU 2016-02 (Note 11). The timing of revenue recognition, billings and cash collections results in billed receivables, unbilled receivables (contract assets) and deferred revenue and customer prepayments (contract liabilities) in the accompanying condensed consolidated balance sheet. The Company considers a number of factors in its evaluation of the creditworthiness of its customers, including past due amounts, past payment history, and current economic conditions. For 3D printing machines, the Company’s terms of sale vary by transaction. To reduce credit risk in connection with 3D printing machine sales, the Company may, depending upon the circumstances, require customers to furnish letters of credit or bank guarantees or to provide advanced payment (either partial or in full). For 3D printed and other products and materials, the Company’s terms of sale generally require payment within 30 to 60 days after delivery, although the Company also recognizes that longer payment periods are customary in certain countries where it transacts business. Service arrangements are generally billed in accordance with specific contract terms and are typically billed in advance or in proportion to performance of the related services. There were no other significant changes in contract liabilities during the three months or six months ended June 30, 2019. Contract assets are not significant. For the six months ended June 30, 2019, the Company recognized revenue of approximately $1,573 related to contract liabilities at January 1, 2019. At June 30, 2019, the Company had approximately $23,100 of remaining performance obligations (including contract liabilities), which is also referred to as backlog, of which approximately $19,700 was expected to be fulfilled during the twelve months following such date. The Company has elected to apply the practical expedient associated with incremental costs of obtaining a contract, and as such, sales commission expense is generally expensed when incurred because the amortization period would be one year or less. These costs are recorded within selling, general and administrative expenses. Accounts receivable are reported at their net realizable value. The Company’s estimate of the allowance for doubtful accounts related to trade receivables is based on the Company’s evaluation of customer accounts with past-due outstanding balances or specific accounts for which it has information that the customer may be unable to meet its financial obligations. Based upon review of these accounts, and management’s analysis and judgment, the Company records a specific allowance for that customer’s accounts receivable balance to reduce the outstanding receivable balance to the amount expected to be collected. The allowance is re-evaluated and adjusted periodically as additional information is received that impacts the allowance amount reserved. At June 30, 2019 and December 31, 2018, the allowance for doubtful accounts was approximately $73

Restructuring

Restructuring	6 Months Ended
	Jun. 30, 2019
Restructuring And Related Activities [Abstract]
Restructuring	Note 6. Restructuring In December 2017 the Company committed to a plan to consolidate certain of its 3D printing operations from its Desenzano del Garda, Italy facility into its Gersthofen, Germany facility. These actions were taken as part of the Company’s efforts to optimize its business model and maximize its facility utilization. During the three months ended December 31, 2017, the Company recorded a charge of approximately $72 split between cost of sales ($19) and selling, general and administrative expense ($53) associated with involuntary employee terminations related to this plan. During the three months ended March 31, 2018, the Company recorded an additional charge of approximately $245 associated with other exit costs ($17) and asset impairments ($228) related to this plan. During the three months ended June 30, 2018, the Company recorded an additional charge of approximately $13 associated with asset impairments related to this plan. In addition, during the three months ended June 30, 2018, the Company recorded a gain from disposal of certain property and equipment of approximately $51 (recorded to cost of sales in the accompanying condensed statement of consolidated operations and comprehensive loss). Charges associated with other exit costs recorded during the six months ended June 30, 2018 were recorded to cost of sales in the accompanying condensed statement of consolidated operations and comprehensive loss. Charges associated with asset impairments recorded during the three and six months ended June 30, 2018 were recorded to cost of sales as a component of depreciation expense in the accompanying condensed statement of consolidated operations and comprehensive loss. Other exit costs relate to the remaining facility rent due under a non-cancellable operating lease following the cessation of operations at the facility in January 2018. Asset impairment charges relate to certain leasehold improvements associated with the exited facility and other equipment which was abandoned by the Company. There are no additional charges expected to be incurred associated with this plan in future periods. The Company settled all amounts associated with involuntary employee terminations and other exit costs (remaining facility rent payments) during 2018.

Impairment

Impairment	6 Months Ended
	Jun. 30, 2019
Asset Impairment Charges [Abstract]
Impairment	Note 7. Impairment During the three months ended June 30, 2019, as a result of continued operating losses and cash flow deficiencies, the Company identified a triggering event requiring a test for the recoverability of long-lived assets held and used at the asset group level. Assessing the recoverability of long-lived assets held and used requires significant judgments and estimates by management. For purposes of testing long-lived assets for recoverability, the Company operates as three separate asset groups: United States, Europe and Japan. In assessing the recoverability of long-lived assets held and used, the Company determined the carrying amount of long-lived assets held and used to be in excess of the estimated future undiscounted net cash flows of the related assets. The Company proceeded to determine the fair value of its long-lived assets held and used, principally through use of the market approach. The Company’s use of the market approach included consideration of market transactions for comparable assets. Management concluded that the fair value of long-lived assets held and used exceeded their carrying value, and as such, no impairment loss was recorded . A significant decrease in the market price of a long-lived asset, adverse change in the use or condition of a long-lived asset, adverse change in the business climate or legal or regulatory factors impacting a long-lived asset and continued operating losses and cash flow deficiencies associated with a long-lived asset, among other indicators, could cause a future assessment to be performed which may result in an impairment of long-lived assets held and used, resulting in a material adverse effect on the financial position and results of operations of the Company.

Cash, Cash Equivalents, and Res

Cash, Cash Equivalents, and Restricted Cash	6 Months Ended
	Jun. 30, 2019
Cash And Cash Equivalents [Abstract]
Cash, Cash Equivalents, and Restricted Cash	Note 8. Cash, Cash Equivalents, and Restricted Cash The following provides a reconciliation of cash, cash equivalents, and restricted cash as reported in the accompanying condensed consolidated balance sheet to the same such amounts shown in the accompanying condensed statement of consolidated cash flows as of the dates indicated: June 30, December 31, 2019 2018 Cash and cash equivalents $ 5,462 $ 7,592 Restricted cash 1,790 1,548 Cash, cash equivalents, and restricted cash $ 7,252 $ 9,140 Restricted cash at June 30, 2019 and December 31, 2018 includes approximately $1,284 and $1,044, respectively, associated with cash collateral required by a German bank for short-term financial guarantees issued by ExOne GmbH in connection with certain commercial transactions requiring security (Note 12). Restricted cash at June 30, 2019 and December 31, 2018 includes approximately $506 and $504, respectively, associated with cash collateral required by a United States bank to offset certain short-term, unsecured lending commitments associated with the Company’s corporate credit card program. Each of the balances described are considered legally restricted by the Company.

Inventories

Inventories	6 Months Ended
	Jun. 30, 2019
Inventory Disclosure [Abstract]
Inventories	Note 9. Inventories Inventories consisted of the following as of the dates indicated: June 30, December 31, 2019 2018 Raw materials and components $ 7,623 $ 7,747 Work in process 4,803 5,147 Finished goods 3,757 3,036 $ 16,183 $ 15,930 Raw materials and components consist of consumable materials and component parts and subassemblies associated with 3D printing machine manufacturing and support activities. Work in process consists of 3D printing machines and other products in varying stages of completion. Finished goods consist of 3D printing machines and other products prepared for sale in accordance with customer specifications. At June 30, 2019 and December 31, 2018, the allowance for slow-moving and obsolete inventories was approximately $4,149 and $4,143, respectively, and has been reflected as a reduction to inventories (principally raw materials and components). During the three months ended June 30, 2018, the Company recorded a charge of approximately $561 to cost of sales in the accompanying condensed statement of consolidated operations and comprehensive loss attributable to certain industrial microwave inventories based on a sustained absence of demand for such curing solutions and a decision by the Company to discontinue future manufacturing of such industrial microwaves.

Product Warranty Reserves

Product Warranty Reserves	6 Months Ended
	Jun. 30, 2019
Product Warranties Disclosures [Abstract]
Product Warranty Reserves	Note 10. Product Warranty Reserves Substantially all of the Company’s 3D printing machines are covered by a standard twelve- month warranty. Generally, at the time of sale, a liability is recorded (with an offset to cost of sales) based upon the expected cost of replacement parts and labor to be incurred over the life of the standard warranty. Expected cost is estimated using historical experience for similar products. The Company periodically assesses the adequacy of the product warranty reserves based on changes in these factors and records any necessary adjustments if actual experience indicates that adjustments are necessary. Future claims experience could be materially different from prior results because of the introduction of new, more complex products, a change in the Company’s warranty policy in response to industry trends, competition or other external forces, or manufacturing changes that could impact product quality. In the event that the Company determines that its current or future product repair and replacement costs exceed estimates, an adjustment to these reserves would be charged to cost of sales in the period such a determination is made. The following table summarizes changes in product warranty reserves, which amounts were reflected in accrued expenses and other current liabilities in the accompanying condensed consolidated balance sheet for the periods indicated: Three Months Ended Six Months Ended June 30, June 30, 2019 2018 2019 2018 Balance at beginning of period $ 1,251 $ 1,148 $ 1,670 $ 1,300 Provisions for new issuances 383 167 529 386 Payments (457 ) (120 ) (848 ) (328 ) Reserve adjustments 36 (252 ) (123 ) (439 ) Foreign currency translation adjustments 10 (34 ) (5 ) (10 ) Balance at end of period $ 1,223 $ 909 $ 1,223 $ 909

Leases

Leases	6 Months Ended
	Jun. 30, 2019
Leases [Abstract]
Leases	Note 11. Leases Lessee The Company leases machinery and other equipment and vehicles under operating lease arrangements (with initial terms greater than twelve months), expiring in various years through 2026. In addition, the Company leases certain equipment and vehicles under finance (previously capital) lease arrangements, which are not significant. For all operating lease arrangements (with the exception of short-term lease arrangements), the Company presents at the commencement date: a lease liability, which is a lessee’s obligation to make lease payments arising from a lease, measured on a discounted basis; and a right-of-use asset, which is an asset that represents the lessee’s right to use, or control the use of, a specified asset for the lease term. The Company has elected, as a practical expedient, not to separate non-lease components from lease components, and instead account for each separate component as a single lease component for all lease arrangements, as lessee. In addition, the Company has elected, as a practical expedient, not to apply lease recognition requirements to short-term lease arrangements, generally those with a lease term of less than twelve months, for all classes of underlying assets. In determination of the lease term, the Company considers the likelihood of lease renewal options and lease termination provisions. As a result, lease payments under these short-term lease arrangements are recognized in the accompanying condensed statement of consolidated operations and comprehensive loss on a straight-line basis over the lease term. The Company uses its incremental borrowing rate in determining the present value of lease payments, as the implicit rate of the lease arrangements is generally not readily determinable. Certain of the Company’s operating lease arrangements are with related parties under common control (Note 18). Lease cost under operating lease agreements with related parties, included within short-term lease cost below, was approximately $12 and $24 for the three months and six months ended June 30, 2019. Future minimum lease payments of operating lease arrangements (with initial terms greater than twelve months) at June 30, 2019, were approximately as follows: 2019 $ 90 2020 109 2021 72 2022 58 2023 9 Thereafter 4 Total minimum lease payments 342 Less: Present value discount (32 ) Total operating lease liabilities $ 310 For the three months and six months ended June 30, 2019, lease cost under operating lease arrangements was approximately $98 (including $47 relating to short-term lease arrangements) and $211 (including $112 relating to short-term lease arrangements), respectively. Supplemental information related to operating lease arrangements (with initial terms greater than twelve months) was as follows at and for the six months ended June 30, 2019: Operating lease right-of-use assets included in other noncurrent assets $ 310 Operating lease liabilities included in accrued expenses and other current liabilities $ 131 Operating lease liabilities included in other noncurrent liabilities $ 179 Right-of-use assets obtained in exchange for new operating lease liabilities $ 9 Cash paid for amounts included in the measurement of operating lease liabilities $ 99 Weighted average remaining lease term (in years) 3.0 Weighted average discount rate 6.5 % As previously disclosed under the prior lease accounting standard, future minimum lease payments of operating lease arrangements (with initial terms greater than twelve months) at December 31, 2018, were approximately as follows: 2019 $ 170 2020 111 2021 76 2022 67 2023 12 Thereafter 5 $ 441 Lessor The Company leases machinery and equipment to customers (principally 3D printing machines and related equipment) under lease arrangements classified as either operating leases or sales-type leases. The Company’s operating lease arrangements have initial terms generally ranging from one to five years, certain of which may contain extension or termination clauses, or both. Such operating lease arrangements also generally include a purchase option to acquire the related machinery and equipment at the end of the lease term for either a fixed amount as determined at inception, or a subsequently negotiated fair market value. At June 30, 2019, the Company estimated that the total fair market value significantly exceeded the related net book value of the machinery and equipment held under the Company’s operating lease arrangements. The Company’s sales-type lease arrangements generally include transfer of ownership at the end of the lease term, and as such, the Company’s net investment in sale-type lease arrangements presented in the Company’s accompanying condensed consolidated balance sheet generally does not include an amount of unguaranteed residual value. The Company has elected, as a practical expedient, not to separate non-lease components from lease components, and instead account for each separate component as a single lease component for all lease arrangements, as lessor. Sales, value add, and other taxes collected from customers and remitted to governmental authorities are accounted for on a net (excluded from lease income) basis. In determination of the lease term, the Company considers the likelihood of lease renewal options and lease termination provisions. Additionally, certain of the Company’s lease arrangements do not qualify as sale-type leases as collectability is not reasonably assured. The Company recognized the following components under operating and sales-type lease arrangements in the accompanying condensed statement of consolidated operations and comprehensive loss for the periods indicated: Three Months Ended Six Months Ended June 30, June 30, 2019 2018 2019 2018 Operating Sales-type Operating Sales-type Operating Sales-type Operating Sales-type Revenue $ 706 $ — $ 251 $ — $ 1,026 $ — $ 452 $ — Interest income (a) $ — $ 27 $ — $ 13 $ — $ 55 $ — $ 26 (a) Interest income relating to sales-type leases is recorded as a component of revenue in the accompanying condensed statement of consolidated operations and comprehensive loss for each of the periods presented. The Company’s net investment in sales-type leases consisted of the following as of the dates indicated: June 30, December 31, 2019 2018 Future minimum lease payments receivable $ 1,757 $ 1,969 Less: Unearned interest income (260 ) (316 ) Net investment in sales-type leases $ 1,497 $ 1,653 Future minimum lease payments of non-cancellable operating and sales-type lease arrangements at June 30, 2019, were approximately as follows: Operating Sales-type 2019 $ 566 $ 200 2020 138 381 2021 48 381 2022 — 381 2023 — 414 Thereafter — — Total minimum lease payments $ 752 $ 1,757 Less: Present value discount (260 ) Future minimum lease payments receivable $ 1,497 As previously disclosed under the prior lease accounting standard, minimum future rentals under non-cancellable operating and sales-type lease arrangements at December 31, 2018, were approximately as follows: Operating Sales-type 2019 $ 687 $ 409 2020 148 382 2021 48 382 2022 — 382 2023 — 414 Thereafter — — $ 883 $ 1,969

Contingencies and Commitments

Contingencies and Commitments	6 Months Ended
	Jun. 30, 2019
Commitments And Contingencies Disclosure [Abstract]
Contingencies and Commitments	Note 12. Contingencies and Commitments Contingencies On March 1, 2018, the Company’s ExOne GmbH subsidiary notified Voxeljet AG that it had materially breached a 2003 Patent and Know-How Transfer Agreement and asserted its rights to set-off damages as a result of the breaches against the annual license fee due from the Company under the agreement. At this time, the Company cannot reasonably estimate a contingency, if any, related to this matter. 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. Commitments In the normal course of its operations, ExOne GmbH issues short-term financial guarantees and letters of credit to third parties in connection with certain commercial transactions requiring security. ExOne GmbH maintains a credit facility with a German bank which provides for various short-term financings in the form of overdraft credit, financial guarantees, letters of credit and collateral security for commercial transactions for an aggregate of approximately $1,400 (€1,300). In addition, ExOne GmbH may use the credit facility for short-term, fixed-rate loans in minimum increments of approximately $100 (€100) with minimum terms of at least 30 July 2019 In addition to amounts issued by ExOne GmbH under the credit facility, from time to time, ExOne GmbH enters into separate agreements with the same German bank for additional capacity for financial guarantees and letters of credit associated with certain commercial transactions requiring security. Terms of the separate agreements are substantially similar to those of the existing credit facility. At June 30, 2019, ExOne GmbH had a singular financial guarantee outstanding under a separate agreement for approximately $91 (€80) with an expiration date of February 2023. Related to this separate agreement, the requirement for cash collateral was waived by the German bank as it also represents the counterparty in the related transaction.

Related Party Revolving Credit

Related Party Revolving Credit Facility	6 Months Ended
	Jun. 30, 2019
Related Party Transactions [Abstract]
Related Party Revolving Credit Facility	Note 13. Related Party Revolving Credit Facility On March 12, 2018, ExOne and its ExOne Americas LLC and ExOne GmbH subsidiaries, as guarantors (collectively, the “Loan Parties”), entered into a Credit Agreement and related ancillary agreements with LBM Holdings, LLC (“LBM”), a company controlled by S. Kent Rockwell, who was the Executive Chairman of the Company (a related party) at such date and is currently Chairman of the Board of Directors (the “Board”) of the Company, relating to a $15,000 revolving credit facility (the “LBM Credit The LBM Credit Agreement contains several affirmative covenants including prompt payment of liabilities and taxes; maintenance of insurance, properties, and licenses; and compliance with laws. The LBM Credit Agreement also contains several negative covenants including restricting the incurrence of certain additional debt; prohibiting future liens (other than permitted liens); prohibiting investment in third parties; limiting the ability to pay dividends; limiting mergers, acquisitions, and dispositions; and limiting the sale of certain property and equipment of the Loan Parties. The LBM Credit Agreement does not contain any financial covenants. The LBM Credit Agreement also contains events of default, including, but not limited to, cross-default to certain other debt, breaches of representations and warranties, change of control events and breaches of covenants. LBM was determined to be a related party based on common control by S. Kent Rockwell. Accordingly, the Company does not consider the LBM Credit Agreement indicative of a fair market value lending. Prior to execution, the LBM Credit Agreement was reviewed and approved by the Audit Committee of the Board and subsequently by a sub-committee of independent members of the Board. At the time of execution of the LBM Credit Agreement, the $15,000 in available loan proceeds was deposited into an escrow account with an unrelated, third party financial institution acting as escrow agent pursuant to a separate Escrow Agreement by and among the parties. Loan proceeds held in escrow are available to the Company upon its submission to the escrow agent of a loan request. Such proceeds will not be available to LBM until payment in-full of the obligations under the LBM Credit Agreement and termination of the LBM Credit Agreement. Payments of principal and other obligations will be made to the escrow agent, while interest payments will be made directly to LBM. Provided there exists no potential default or event of default, the LBM Credit Agreement and Escrow Agreement prohibit any acceleration of repayment of any amount outstanding under the LBM Credit Agreement and prohibit termination of the LBM Credit Agreement or withdrawal from escrow of any unused portion of the available loan proceeds under the credit facility, by LBM. There have been no borrowings by the Company under the LBM Credit Agreement from March 12, 2018 (inception) through June 30, 2019. The Company incurred approximately $265 in debt issuance costs associated with the LBM Credit Agreement (including the aforementioned up front commitment fee paid at closing to LBM). During the three months and six months ended June 30, 2019, the Company recorded interest expense relating to the LBM Credit Agreement of approximately $50 and $100, respectively. Included in interest expense for the three months and six months ended June 30, 2019 was approximately $22 and $44, respectively, associated with amortization of debt issuance costs. At June 30, 2019 and December 31, 2018, remaining debt issuance costs were approximately $151 and $195, respectively (of which approximately $88 was included in prepaid expenses and other current assets for both periods and approximately $63 and $107, respectively, was included in other noncurrent assets in the accompanying condensed consolidated balance sheet). Also included in interest expense for the three months and six months ended June 30, 2019 was approximately $28 and $56, respectively, associated with the commitment fee on the unused portion of the revolving credit facility. At June 30, 2019 and December 31, 2018, approximately $9 and $10, respectively, was included in accounts payable in the accompanying condensed consolidated balance sheet. Amounts payable to LBM at June 30, 2019 and December 2018 were settled by the Company in July 2019 and January 2019, respectively. During the three months and six months ended June 30, 2018, the Company recorded interest expense relating to the LBM Credit Agreement of approximately $49 and $59, respectively.

Income Taxes

Income Taxes	6 Months Ended
	Jun. 30, 2019
Income Tax Disclosure [Abstract]
Income Taxes	Note 14. Income Taxes The provision (benefit) for income taxes for the three months ended June 30, 2019 and 2018 was approximately $99 and $18, respectively. The provision (benefit) for income taxes for the six months ended June 30, 2019 and 2018 was approximately ($701) and $35, respectively. The Company has completed a discrete period computation of its provision (benefit) for income taxes for each of the periods presented. The discrete period computation was required as a result of jurisdictions with losses before income taxes for which no tax benefit can be recognized and 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 three months ended June 30, 2019 and 2018 was 2.7% (provision on a loss) and 0.2% (provision on a loss), respectively. The effective tax rate for the six months ended June 30, 2019 and 2018 was 7.8% (benefit on a loss) and 0.2% (provision on a loss), respectively. For the three months ended June 30, 2019 and 2018, the effective tax rate differs from the United States federal statutory rate of 21.0% primarily due to net changes in valuation allowances for the periods. For the six months ended June 30, 2019, the effective tax rate differs from the United States federal statutory rate of 21.0% primarily due to the reversal of previously recorded liabilities for uncertain tax positions (further described below) and net changes in valuation allowances for the period. 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 in which it operates. As such, any benefit from deferred taxes in any of the periods presented has been fully offset by changes in the valuation allowance for net deferred tax assets. The Company continues to assess its future taxable income by jurisdiction based on recent historical operating results, the expected timing of reversal of temporary differences, various tax planning strategies that the Company may be able to enact in future periods, the impact of potential operating changes on the business and 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 its net deferred tax assets are realizable based on any combination of the above factors in a single, or in multiple, taxing jurisdictions, a reversal of the related portion of the Company’s existing valuation allowances may occur. The Company has a liability for uncertain tax positions related to certain intercompany transactions. A reconciliation of the beginning and ending amount of unrecognized tax benefits (including accrued interest and penalties) was as follows for the periods indicated: Three Months Ended Six Months Ended June 30, June 30, 2019 2018 2019 2018 Balance at beginning of period $ 102 $ 1,904 $ 1,186 $ 1,775 Additions based on tax positions related to the current year — — — — Additions for tax positions of prior years 1 60 2 118 Reductions for tax positions of prior years — — (1,075 ) — Settlements — — — — Foreign currency translation adjustments 2 (93 ) (8 ) (22 ) Balance at end of period $ 105 $ 1,871 $ 105 $ 1,871 The Company includes interest and penalties related to income taxes as a component of the provision (benefit) for income taxes in the accompanying condensed statement of consolidated operations and comprehensive loss. There were no such interest or penalties included in the provision (benefit) for income taxes for any of the periods presented. At December 31, 2018, there was approximately $820 in unrecognized tax benefits (including accrued interest and penalties) that if recognized would affect the annual effective tax rate. Such amounts were included in accrued expenses and other current liabilities in the accompanying condensed consolidated balance sheet at December 31, 2018. There were no such unrecognized tax benefits at June 30, 2019. At December 31, 2018, the Company’s ExOne GmbH (2010-2013) and ExOne Property GmbH (2013) subsidiaries were under examination by local taxing authorities in Germany. In January 2019, this examination was concluded by the local taxing authorities in Germany without significant adjustment to previously established tax positions. As a result, during the three months ended March 31, 2019, the Company recorded a reversal of certain of its previously recorded liabilities for uncertain tax positions of approximately $1,075, of which approximately $257 was offset against net operating loss carryforwards.

Equity-Based Compensation

Equity-Based Compensation	6 Months Ended
	Jun. 30, 2019
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Equity-Based Compensation	Note 15. Equity-Based Compensation On January 24, 2013, the Board 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 3.0% of the total outstanding shares of common stock as of December 31 of the immediately preceding year, or a number of shares of common stock determined by the Board, provided that the maximum number of shares authorized under the Plan could not exceed 1,992,241 shares, subject to certain adjustments. The maximum number of shares authorized under the Plan was reached on January 1, 2017. At June 30, 2019, 865,506 shares remained available for future issuance under the Plan. Stock options and restricted stock issued by the Company under the Plan are generally subject to service conditions resulting in annual vesting on the anniversary of the date of grant over a period typically ranging between one and three years. Certain stock options and restricted stock issued by the Company under the Plan vest immediately upon issuance. Stock options issued by the Company under the Plan have contractual lives which expire over a period typically ranging between five and ten years from the date of grant subject to continued service to the Company by the participant. On February 7, 2018, the Compensation Committee of the Board adopted the 2018 Annual Incentive Program (the “Program”) as a subplan under the Plan. The Program provided an opportunity for performance-based compensation to senior executive officers of the Company, among others. The target annual incentive for each Program participant was expressed as a percentage of base salary and was conditioned on the achievement of certain financial goals (as approved by the Compensation Committee of the Board) or a combination of financial and non-financial goals. The Compensation Committee of the Board retained negative discretion over amounts payable under the Program. The following table summarizes the total equity-based compensation expense recognized by the Company for the periods indicated: Three Months Ended Six Months Ended June 30, June 30, 2019 2018 2019 2018 Equity-based compensation expense recognized: Stock options $ 150 $ (175 ) $ 316 $ 28 Restricted stock 245 100 374 206 Other (a) 247 70 391 140 Total equity-based compensation expense before income taxes 642 (5 ) 1,081 374 Benefit for income taxes (b) — — — — Total equity-based compensation expense net of income taxes $ 642 $ (5 ) $ 1,081 $ 374 (a) Other represents expense associated with the Program and other employee contractual amounts to be settled in equity. (b) The benefit for income taxes from equity-based compensation for each of the periods presented has been determined to be $0 based on valuation allowances against net deferred tax assets. At June 30, 2019, total future compensation expense related to unvested awards yet to be recognized by the Company was approximately $541 for stock options and $498 for restricted stock. 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 1.2 years. The fair value of stock options granted was estimated on the date of grant using the Black-Scholes option pricing model with the following assumptions for the periods indicated: Six Months Ended June 30, 2019 2018 Weighted average fair value per stock option $3.48 - $3.68 $3.77 Volatility 54.0% - 60.1% 62.6% Average risk-free interest rate 2.2% - 2.5% 2.5% Dividend yield 0.0% 0.0% Expected term (years) 2.5 - 3.5 3.3 For certain stock option awards in which the expected term of the award is less than the period for which the Company has been publicly traded, volatility is estimated based on the historical volatility of the Company. For certain stock option awards in which the expected term of the award exceeds the period for which the Company has been publicly traded, volatility is estimated based on the historical volatilities of certain peer group companies. The average risk-free rate is based on a weighted average yield curve of risk-free interest rates consistent with the expected term of the awards. Expected dividend yield is based on historical dividend data as well as future expectations. Expected term is calculated using the simplified method as the Company does not have sufficient historical exercise experience upon which to base an estimate. The activity for stock options was as follows for the periods indicated: Six Months Ended June 30, 2019 2018 Number Options Weighted Weighted Average Grant Date Fair Value Number Options Weighted Weighted Average Grant Date Fair Value Outstanding at beginning of period 621,986 $ 10.66 $ 5.52 674,470 $ 11.58 $ 6.41 Stock options granted 57,610 $ 8.33 $ 3.67 24,000 $ 8.36 $ 3.77 Stock options exercised (36,370 ) $ 7.22 $ 3.03 — $ — $ — Stock options forfeited (9,773 ) $ 7.67 $ 3.70 (133,835 ) $ 9.44 $ 5.15 Stock options expired (24,666 ) $ 17.10 $ 10.45 (28,000 ) $ 10.03 $ 5.19 Outstanding at end of period 608,787 $ 10.43 $ 5.33 536,635 $ 12.05 $ 6.68 Stock options exercisable at end of period 385,709 $ 11.56 $ 6.20 396,627 $ 13.14 $ 7.53 Stock options expected to vest at end of period 223,078 $ 8.48 $ 3.82 140,008 $ 8.96 $ 4.29 At June 30, 2019, intrinsic value associated with stock options exercisable and expected to vest was approximately $289 and $251, respectively. The weighted average remaining contractual term of both stock options exercisable and expected to vest at June 30, 2019, was approximately 4.3 years. Stock options with an aggregate intrinsic value of approximately $326 were The activity for restricted stock was as follows for the periods indicated: Six Months Ended June 30, 2019 2018 Shares of Restricted Stock Weighted Average Grant Date Fair Value Shares of Restricted Stock Weighted Average Grant Date Fair Value Outstanding at beginning of period 67,001 $ 8.30 52,502 $ 11.07 Restricted stock granted 66,763 $ 8.98 25,000 $ 8.21 Restricted stock vested (37,500 ) $ 8.12 (25,000 ) $ 10.10 Restricted stock forfeited — $ — — $ — Outstanding at end of period 96,264 $ 8.84 52,502 $ 10.17 Restricted stock expected to vest at end of period 96,264 $ 8.84 52,502 $ 10.17 Restricted stock that vested during the six months ended June 30, 2019 and 2018, had a fair value of approximately $356 and $205, respectively. During the six months ended June 30, 2019, the Company made cash payments for taxes of approximately $68 relating to the net settlement of certain equity-based awards. There were no cash payments for taxes or net settlement of equity-based awards during the six months ended June 30, 2018.

Fair Value Measurements

Fair Value Measurements	6 Months Ended
	Jun. 30, 2019
Fair Value Disclosures [Abstract]
Fair Value Measurements	Note 16. Fair Value Measurements Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. When determining the fair value measurements for assets and liabilities which are required to be recorded at fair value, the Company considers the principal or most advantageous market in which the Company would transact and the market-based risk measurements or assumptions that market participants would use in pricing the asset or liability, such as inherent risk, transfer restrictions and credit risk. The Company applies the following fair value hierarchy, which prioritizes the inputs used to measure fair value into three levels and bases the categorization within the hierarchy upon the lowest level of input that is available and significant to the fair value measurement: Level 1 Observable inputs such as quoted prices in active markets for identical investments that the Company has the ability to access. Level 2 Inputs include: Quoted prices for similar assets or liabilities in active markets; Quoted prices for identical or similar assets or liabilities in inactive markets; Inputs, other than quoted prices in active markets, that are observable either directly or indirectly; and Inputs that are derived principally from, or corroborated by, observable market data by correlation or other means. Level 3 Inputs that are generally unobservable and typically reflect management’s estimates of assumptions that market participants would use in pricing the asset or liability. The Company is required to disclose its estimate of the fair value of material financial instruments, including those recorded as assets or liabilities in its consolidated financial statements, in accordance with GAAP. At June 30, 2019 and December 31, 2018, the Company had no financial instruments (assets or liabilities) measured at fair value on a recurring basis. The carrying values and fair values of other financial instruments (assets and liabilities) not required to be recorded at fair value were as follows as of the dates indicated: June 30, December 31, 2019 2018 Carrying Value Fair Value Carrying Value Fair Value Cash and cash equivalents $ 5,462 $ 5,462 $ 7,592 $ 7,592 Restricted cash $ 1,790 $ 1,790 $ 1,548 $ 1,548 Debt issuance costs (a) $ 151 $ — $ 195 $ — Current portion of long-term debt (b) $ 149 $ 153 $ 144 $ 149 Long-term debt ̶ (b) $ 1,288 $ 1,306 $ 1,364 $ 1,384 (a) Represents debt issuance costs associated with the Company’s related party revolving credit facility (Note 13) of which 63 (b) Carrying values at June 30, 2019 and December 31, 2018 are net of unamortized debt issuance costs of approximately $22 and $25, respectively The carrying amounts of cash and cash equivalents, restricted cash and current portion of long-term debt approximate fair value due to their short-term maturities. The fair value of long-term debt – net of current portion has been estimated by management based on the consideration of applicable interest rates (including certain instruments at variable or floating rates) and other available information (including quoted prices of similar instruments available to the Company). Cash and cash equivalents and restricted cash were classified as Level 1; Current portion of long-term debt and long-term debt – net of current portion were classified as Level 2.

Concentration of Credit Risk

Concentration of Credit Risk	6 Months Ended
	Jun. 30, 2019
Risks And Uncertainties [Abstract]
Concentration of Credit Risk	Note 17. Concentration of Credit Risk During the three months and six months ended June 30, 2019 and 2018, the Company conducted a significant portion of its business with a limited number of customers, though not necessarily the same customers for each respective period. For the three months ended June 30, 2019 and 2018, the Company’s five most significant customers represented approximately 46.4% and 33.0% of total revenue, respectively. For the six months ended June 30, 2019 and 2018, the Company’s five most significant customers represented approximately 33.0% and 25.2% of total revenue, respectively. At June 30, 2019 and December 31, 2018, accounts receivable from the Company’s five most significant customers were approximately $1,681 and $2,344, respectively.

Related Party Transactions

Related Party Transactions	6 Months Ended
	Jun. 30, 2019
Related Party Transactions [Abstract]
Related Party Transactions	Note 18. Related Party Transactions Purchases of products and/or services from related parties during the three months ended June 30, 2019 and 2018, were approximately $43 and $6, respectively. Purchases of products and/or services from related parties during the six months ended June 30, 2019 and 2018, were approximately $58 and $12, respectively. Purchases of products and/or services by the Company during each of the respective periods primarily included website design services and leased office space (through August 2019) from related parties under common control by S. Kent Rockwell (currently the Chairman of the Board of the Company and previously the Executive Chairman and Chief Executive Officer of the Company). In addition, during the three months ended June 30, 2019, the Company purchased a 3D printing machine and certain ancillary equipment for approximately $30 from an educational institution determined to be a related party on the basis that S. Kent Rockwell serves as a trustee of the educational institution. None of the transactions met a threshold requiring review and approval by the Audit Committee of the Board of Directors of the Company. Amounts due to related parties associated with the purchase of products and/or services at December 31, 2018 were approximately $1 and are reflected in accounts payable in the accompanying condensed consolidated balance sheet. There were no amounts due to related parties associated with the purchase of products and/or services at June 30, 2019. The Company also receives the benefit of the corporate use of an airplane from a related party under common control by S. Kent Rockwell for no consideration. The Company estimates the fair market value of the benefits received during each of the three months and six months ended June 30, 2019 was approximately $3. There were no such benefits received during the three months and six months ended June 30, 2018. Refer to Note 13 for further discussion relating to a revolving credit facility with a related party entered into in March 2018.

Other Expense (Income) _ Net

Other Expense (Income) – Net	6 Months Ended
	Jun. 30, 2019
Other Income And Expenses [Abstract]
Other Expense (Income) – Net	Note 19. Other Expense (Income) – Net Other expense (income) – net consisted of the following for the periods indicated: Three Months Ended Six Months Ended June 30, June 30, 2019 2018 2019 2018 Interest income $ (2 ) $ (3 ) $ (8 ) $ (22 ) Foreign currency losses (gains) – net 29 (54 ) 51 (99 ) Bank fees 23 24 48 43 Other – net 7 (19 ) (22 ) (20 ) $ 57 $ (52 ) $ 69 $ (98 )

Subsequent Events

Subsequent Events	6 Months Ended
	Jun. 30, 2019
Subsequent Events [Abstract]
Subsequent Events	Note 20. 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 (Policies

Basis of Presentation (Policies)	6 Months Ended
	Jun. 30, 2019
Accounting Policies [Abstract]
Organization	Organization The ExOne Company (“ExOne”) is a corporation organized under the laws of the state of Delaware. ExOne was formed on January 1, 2013, when The Ex One Company, LLC, a Delaware limited liability company, merged with and into a Delaware corporation, which survived and changed its name to The ExOne Company (the “Reorganization”). As a result of the Reorganization, The Ex One Company, LLC became ExOne, the common and preferred interest holders of The Ex One Company, LLC became holders of common stock and preferred stock, respectively, of ExOne, and the subsidiaries of The Ex One Company, LLC became the subsidiaries of ExOne. The condensed consolidated financial statements include the accounts of ExOne, its wholly-owned subsidiaries, ExOne Americas LLC (United States); ExOne GmbH (Germany); ExOne Property GmbH (Germany); ExOne KK (Japan); and through December 2018, ExOne Italy S.r.l (Italy). Collectively, the consolidated group is referred to as the “Company”. The Company filed a registration statement on Form S-3 (No. 333-223690) with the Securities and Exchange Commission (“SEC”) on March 15, 2018. The purpose of the Form S-3 was to register, among other securities, debt securities. Subsidiaries of the Company are co-registrants with the Company (“Subsidiary Guarantors”), and the registration statement registered guarantees of debt securities by one or more of the Subsidiary Guarantors. The Subsidiary Guarantors are 100% owned by the Company and any guarantees by the Subsidiary Guarantors will be full and unconditional. There have been no transactions undertaken subject to the Form S-3 since its initial filing. Basis of Presentation 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, 2018 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, 2018, which includes all disclosures required by GAAP. The preparation of these condensed consolidated financial statements requires the Company to make certain judgments, estimates and assumptions regarding uncertainties that affect the reported amounts of assets, liabilities, revenue and expenses and related disclosure of contingent assets and liabilities. Areas that require significant judgments, estimates and assumptions include accounting for accounts receivable (including the allowance for doubtful accounts); inventories (including the allowance for slow-moving and obsolete inventories); product warranty reserves; contingencies; income taxes (including the valuation allowance on certain deferred tax assets and liabilities for uncertain tax positions); equity-based compensation (including the valuation of certain equity-based compensation awards issued by the Company); and testing for impairment of long-lived assets (including the identification of asset groups by management, estimates of future cash flows of identified asset groups and fair value estimates used in connection with assessing the valuation of identified asset groups). The Company bases its estimates on historical experience and on various other assumptions that are believed to be reasonable, the results of which form the basis for making judgments about the carrying values of assets and liabilities that are not readily apparent from other sources. Actual results may differ from these estimates. Certain amounts relating to contract liabilities – net of current portion ($527) in the accompanying condensed consolidated balance sheet at December 31, 2018, have been reclassified from other noncurrent liabilities to conform to current period presentation, following the adoption of Financial Accounting Standards Board (“FASB”) Accounting Standards Update (“ASU”) 2014-09 (further described below). Certain amounts relating to the lessor current portion of net investment in sales-type leases ($302) and lessor net investment in sales-type leases – net of current portion ($1,351) in the accompanying condensed consolidated balance sheet at December 31, 2018, have been reclassified from accounts receivable and other noncurrent assets, respectively, to conform to current period presentation following the adoption of FASB ASU 2016-02 (further described below). Related to the reclassifications further described above, amounts within the condensed statement of consolidated cash flows for the six months ended June 30, 2018 associated with these changes have also been reclassified to conform to current period presentation.
Recently Adopted and Issued Accounting Guidance	Recently Adopted Accounting Guidance On January 1, 2019, the Company adopted FASB ASU 2014-09, “Revenue from Contracts with Customers.” This ASU created a comprehensive framework for all entities in all industries to apply in the determination of when to recognize revenue and, therefore, supersedes virtually all existing revenue recognition requirements and guidance. This framework is expected to provide a consistent and comparable methodology for revenue recognition. The core principle of the guidance is that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. To achieve this principle, an entity should apply the following steps: identify the On January 1, 2019, the Company adopted FASB ASU 2016-02, “Leases.” This ASU requires lessees to recognize a right-of-use asset and lease liability on the consolidated balance sheet for leases classified as operating leases. For leases with a term of 12 months or less, a lessee is permitted to make an accounting policy election by class of underlying asset not to recognize a right-of-use asset and lease liability. Additionally, when measuring assets and liabilities arising from a lease, optional payments should be included only if the lessee is reasonably certain to exercise an option to extend the lease, exercise a purchase option, or not exercise an option to terminate the lease. A right-of-use asset represents an entity’s right to use the underlying asset for the lease term, and a lease liability represents an entity’s obligation to make lease payments. Currently, an asset and liability only are recorded for leases classified as capital leases (financing leases). The measurement, recognition, and presentation of expenses and cash flows arising from leases by a lessee remains the same. In connection with the adoption of this guidance, the Company has completed an assessment resulting in an accumulation of all of its leasing arrangements and has validated the information for accuracy and completeness. Upon adoption of the new lease guidance, management recorded a right-of-use asset and lease liability, each in the amount of approximately $400, on the Company’s consolidated balance sheet for various types of operating leases, including certain machinery and other equipment and vehicles. This amount is equivalent to the aggregate future minimum lease payments on a discounted basis. The Company has also elected to apply the package of transitional practical expedients of the new lease guidance by allowing the Company to not: (1) reassess if expired or existing contracts are, or contain, leases; (2) reassess lease classification for any expired or existing leases; and (3) reassess initial direct costs for any existing leases. Additionally, in July 2018, the FASB issued guidance to provide for an alternative transition method to the new lease guidance, whereby an entity can choose to not reflect the impact of the new lease guidance in the prior periods included in its consolidated financial statements. The Company has utilized this alternative transition method in connection with its adoption on January 1, 2019. The Company has included the enhanced disclosures required by this guidance in its condensed consolidated financial statements (Note 11). On January 1, 2019, the Company adopted FASB ASU 2016-15, “Statement of Cash Flows: Classification of Certain Cash Receipts and Cash Payments.” This ASU is intended to reduce diversity in practice in how certain cash receipts and payments are presented and classified in the statement of consolidated cash flows. The standard provides guidance in a number of situations including, among others, settlement of zero-coupon bonds, contingent consideration payments made after a business combination, proceeds from the settlement of insurance claims, and distributions received from equity method investees. The ASU also provides guidance for classifying cash receipts and payments that have aspects of more than one class of cash flows. The adoption of this ASU did not have an effect on the consolidated financial statements of the Company . Recently Issued Accounting Guidance The Company considers the applicability and impact of all ASUs issued by the FASB. Recently issued ASUs not listed below either were assessed and determined to be not applicable or are currently expected to have no impact on the consolidated financial statements of the Company. In June 2016, the FASB issued ASU 2016-13, “Financial Instruments – Credit Losses.” This ASU added a new impairment model (known as the current expected credit loss (“CECL”) model) that is based on expected losses rather than incurred losses. Under the new guidance, an entity recognizes as an allowance its estimate of expected credit losses. The CECL model applies to most debt instruments, trade receivables, lease receivables, financial guarantee contracts, and other loan commitments. The CECL model does not have a minimum threshold for recognition of impairment losses and entities will need to measure expected credit losses on assets that have a low risk of loss. These changes become effective for the Company on January 1, 2020. Management is currently evaluating the potential impact of these changes on the consolidated financial statements of the Company.
Loss Per Share	The Company presents basic and diluted loss per common share amounts. Basic loss per common share is calculated by dividing net loss available to common stockholders by the weighted average number of common shares outstanding during the applicable period. Diluted loss per common share is calculated by dividing net loss available to common stockholders by the weighted average number of common shares and common equivalent shares outstanding during the applicable period.

Accumulated Other Comprehensi_2

Accumulated Other Comprehensive Loss (Tables)	6 Months Ended
	Jun. 30, 2019
Equity [Abstract]
Summary of Changes in the Components of Accumulated Other Comprehensive Loss	The following table summarizes changes in the components of accumulated other comprehensive loss for the periods indicated: Three Months Ended Six Months Ended June 30, June 30, 2019 2018 2019 2018 Foreign currency translation adjustments Balance at beginning of period $ (11,524 ) $ (8,082 ) $ (10,748 ) $ (9,484 ) Other comprehensive income (loss) 583 (2,240 ) (193 ) (838 ) Balance at end of period $ (10,941 ) $ (10,322 ) $ (10,941 ) $ (10,322 )

Loss Per Share (Tables)

Loss Per Share (Tables)	6 Months Ended
	Jun. 30, 2019
Earnings Per Share [Abstract]
Computation of Basic and Diluted Loss Per Common Share	The information used to compute basic and diluted net loss per common share was as follows for the periods indicated: Three Months Ended Six Months Ended June 30, June 30, 2019 2018 2019 2018 Net loss $ (3,789 ) $ (8,037 ) $ (8,285 ) $ (14,422 ) Weighted average shares outstanding (basic and diluted) 16,301,157 16,149,617 16,278,043 16,144,092 Net loss per common share: Basic $ (0.23 ) $ (0.50 ) $ (0.51 ) $ (0.89 ) Diluted $ (0.23 ) $ (0.50 ) $ (0.51 ) $ (0.89 )

Revenue (Tables)

Revenue (Tables)	6 Months Ended
	Jun. 30, 2019
Revenue From Contract With Customer [Abstract]
Summary of Revenue by Product Group	The following table summarizes the Company’s revenue by product group for the periods indicated: Three Months Ended Six Months Ended June 30, June 30, 2019 2018 2019 2018 3D printing machines $ 9,231 $ 3,213 $ 12,560 $ 7,734 3D printed and other products, materials and services 6,048 7,644 12,298 15,016 $ 15,279 $ 10,857 $ 24,858 $ 22,750

Cash, Cash Equivalents, and R_2

Cash, Cash Equivalents, and Restricted Cash (Tables)	6 Months Ended
	Jun. 30, 2019
Cash And Cash Equivalents [Abstract]
Schedule of Reconciliation of Cash, Cash Equivalents and Restricted Cash	The following provides a reconciliation of cash, cash equivalents, and restricted cash as reported in the accompanying condensed consolidated balance sheet to the same such amounts shown in the accompanying condensed statement of consolidated cash flows as of the dates indicated: June 30, December 31, 2019 2018 Cash and cash equivalents $ 5,462 $ 7,592 Restricted cash 1,790 1,548 Cash, cash equivalents, and restricted cash $ 7,252 $ 9,140

Inventories (Tables)

Inventories (Tables)	6 Months Ended
	Jun. 30, 2019
Inventory Disclosure [Abstract]
Schedule of Inventories	Inventories consisted of the following as of the dates indicated: June 30, December 31, 2019 2018 Raw materials and components $ 7,623 $ 7,747 Work in process 4,803 5,147 Finished goods 3,757 3,036 $ 16,183 $ 15,930

Product Warranty Reserves (Tabl

Product Warranty Reserves (Tables)	6 Months Ended
	Jun. 30, 2019
Product Warranties Disclosures [Abstract]
Summary of Changes in Product Warranty Reserves	The following table summarizes changes in product warranty reserves, which amounts were reflected in accrued expenses and other current liabilities in the accompanying condensed consolidated balance sheet for the periods indicated: Three Months Ended Six Months Ended June 30, June 30, 2019 2018 2019 2018 Balance at beginning of period $ 1,251 $ 1,148 $ 1,670 $ 1,300 Provisions for new issuances 383 167 529 386 Payments (457 ) (120 ) (848 ) (328 ) Reserve adjustments 36 (252 ) (123 ) (439 ) Foreign currency translation adjustments 10 (34 ) (5 ) (10 ) Balance at end of period $ 1,223 $ 909 $ 1,223 $ 909

Leases (Tables)

Leases (Tables)	6 Months Ended
	Jun. 30, 2019
Leases [Abstract]
Schedule of Future Minimum Lease Payments of Operating Leases Arrangements	Future minimum lease payments of operating lease arrangements (with initial terms greater than twelve months) at June 30, 2019, were approximately as follows: 2019 $ 90 2020 109 2021 72 2022 58 2023 9 Thereafter 4 Total minimum lease payments 342 Less: Present value discount (32 ) Total operating lease liabilities $ 310
Schedule of Supplemental Information Related to Operating Lease Arrangements	Supplemental information related to operating lease arrangements (with initial terms greater than twelve months) was as follows at and for the six months ended June 30, 2019: Operating lease right-of-use assets included in other noncurrent assets $ 310 Operating lease liabilities included in accrued expenses and other current liabilities $ 131 Operating lease liabilities included in other noncurrent liabilities $ 179 Right-of-use assets obtained in exchange for new operating lease liabilities $ 9 Cash paid for amounts included in the measurement of operating lease liabilities $ 99 Weighted average remaining lease term (in years) 3.0 Weighted average discount rate 6.5 %
Future Minimum Lease Payments of Operating Lease Arrangements	As previously disclosed under the prior lease accounting standard, future minimum lease payments of operating lease arrangements (with initial terms greater than twelve months) at December 31, 2018, were approximately as follows: 2019 $ 170 2020 111 2021 76 2022 67 2023 12 Thereafter 5 $ 441
Schedule of Operating and Sales-type Lease Arrangements	The Company recognized the following components under operating and sales-type lease arrangements in the accompanying condensed statement of consolidated operations and comprehensive loss for the periods indicated: Three Months Ended Six Months Ended June 30, June 30, 2019 2018 2019 2018 Operating Sales-type Operating Sales-type Operating Sales-type Operating Sales-type Revenue $ 706 $ — $ 251 $ — $ 1,026 $ — $ 452 $ — Interest income (a) $ — $ 27 $ — $ 13 $ — $ 55 $ — $ 26 (a) Interest income relating to sales-type leases is recorded as a component of revenue in the accompanying condensed statement of consolidated operations and comprehensive loss for each of the periods presented.
Schedule of Net Investment in Sales-type Leases	The Company’s net investment in sales-type leases consisted of the following as of the dates indicated: June 30, December 31, 2019 2018 Future minimum lease payments receivable $ 1,757 $ 1,969 Less: Unearned interest income (260 ) (316 ) Net investment in sales-type leases $ 1,497 $ 1,653
Schedule of Future Minimum Lease Payment Receivable of Non-Cancellable Operating and Sales-type Lease	Future minimum lease payments of non-cancellable operating and sales-type lease arrangements at June 30, 2019, were approximately as follows: Operating Sales-type 2019 $ 566 $ 200 2020 138 381 2021 48 381 2022 — 381 2023 — 414 Thereafter — — Total minimum lease payments $ 752 $ 1,757 Less: Present value discount (260 ) Future minimum lease payments receivable $ 1,497
Schedule of Future Minimum Lease or Rental Payments of Non-Cancellable Operating and Sales-type Lease	As previously disclosed under the prior lease accounting standard, minimum future rentals under non-cancellable operating and sales-type lease arrangements at December 31, 2018, were approximately as follows: Operating Sales-type 2019 $ 687 $ 409 2020 148 382 2021 48 382 2022 — 382 2023 — 414 Thereafter — — $ 883 $ 1,969

Income Taxes (Tables)

Income Taxes (Tables)	6 Months Ended
	Jun. 30, 2019
Income Tax Disclosure [Abstract]
Reconciliation of Unrecognized Tax Benefits (Including Accrued Interest and Penalties)	A reconciliation of the beginning and ending amount of unrecognized tax benefits (including accrued interest and penalties) was as follows for the periods indicated: Three Months Ended Six Months Ended June 30, June 30, 2019 2018 2019 2018 Balance at beginning of period $ 102 $ 1,904 $ 1,186 $ 1,775 Additions based on tax positions related to the current year — — — — Additions for tax positions of prior years 1 60 2 118 Reductions for tax positions of prior years — — (1,075 ) — Settlements — — — — Foreign currency translation adjustments 2 (93 ) (8 ) (22 ) Balance at end of period $ 105 $ 1,871 $ 105 $ 1,871

Equity-Based Compensation (Tabl

Equity-Based Compensation (Tables)	6 Months Ended
	Jun. 30, 2019
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Summary of Equity-Based Compensation Expense	The following table summarizes the total equity-based compensation expense recognized by the Company for the periods indicated: Three Months Ended Six Months Ended June 30, June 30, 2019 2018 2019 2018 Equity-based compensation expense recognized: Stock options $ 150 $ (175 ) $ 316 $ 28 Restricted stock 245 100 374 206 Other (a) 247 70 391 140 Total equity-based compensation expense before income taxes 642 (5 ) 1,081 374 Benefit for income taxes (b) — — — — Total equity-based compensation expense net of income taxes $ 642 $ (5 ) $ 1,081 $ 374 (a) Other represents expense associated with the Program and other employee contractual amounts to be settled in equity. (b) The benefit for income taxes from equity-based compensation for each of the periods presented has been determined to be $0 based on valuation allowances against net deferred tax assets.
Assumptions for Fair Value of Stock Options Granted Estimated on the Date of Grant Using the Black-Scholes Option	The fair value of stock options granted was estimated on the date of grant using the Black-Scholes option pricing model with the following assumptions for the periods indicated: Six Months Ended June 30, 2019 2018 Weighted average fair value per stock option $3.48 - $3.68 $3.77 Volatility 54.0% - 60.1% 62.6% Average risk-free interest rate 2.2% - 2.5% 2.5% Dividend yield 0.0% 0.0% Expected term (years) 2.5 - 3.5 3.3
Summary of Activity for Stock Options	The activity for stock options was as follows for the periods indicated: Six Months Ended June 30, 2019 2018 Number Options Weighted Weighted Average Grant Date Fair Value Number Options Weighted Weighted Average Grant Date Fair Value Outstanding at beginning of period 621,986 $ 10.66 $ 5.52 674,470 $ 11.58 $ 6.41 Stock options granted 57,610 $ 8.33 $ 3.67 24,000 $ 8.36 $ 3.77 Stock options exercised (36,370 ) $ 7.22 $ 3.03 — $ — $ — Stock options forfeited (9,773 ) $ 7.67 $ 3.70 (133,835 ) $ 9.44 $ 5.15 Stock options expired (24,666 ) $ 17.10 $ 10.45 (28,000 ) $ 10.03 $ 5.19 Outstanding at end of period 608,787 $ 10.43 $ 5.33 536,635 $ 12.05 $ 6.68 Stock options exercisable at end of period 385,709 $ 11.56 $ 6.20 396,627 $ 13.14 $ 7.53 Stock options expected to vest at end of period 223,078 $ 8.48 $ 3.82 140,008 $ 8.96 $ 4.29
Summary of Activity for Restricted Stock Awards	The activity for restricted stock was as follows for the periods indicated: Six Months Ended June 30, 2019 2018 Shares of Restricted Stock Weighted Average Grant Date Fair Value Shares of Restricted Stock Weighted Average Grant Date Fair Value Outstanding at beginning of period 67,001 $ 8.30 52,502 $ 11.07 Restricted stock granted 66,763 $ 8.98 25,000 $ 8.21 Restricted stock vested (37,500 ) $ 8.12 (25,000 ) $ 10.10 Restricted stock forfeited — $ — — $ — Outstanding at end of period 96,264 $ 8.84 52,502 $ 10.17 Restricted stock expected to vest at end of period 96,264 $ 8.84 52,502 $ 10.17

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	6 Months Ended
	Jun. 30, 2019
Fair Value Disclosures [Abstract]
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 as of the dates indicated: June 30, December 31, 2019 2018 Carrying Value Fair Value Carrying Value Fair Value Cash and cash equivalents $ 5,462 $ 5,462 $ 7,592 $ 7,592 Restricted cash $ 1,790 $ 1,790 $ 1,548 $ 1,548 Debt issuance costs (a) $ 151 $ — $ 195 $ — Current portion of long-term debt (b) $ 149 $ 153 $ 144 $ 149 Long-term debt ̶ (b) $ 1,288 $ 1,306 $ 1,364 $ 1,384 (a) Represents debt issuance costs associated with the Company’s related party revolving credit facility (Note 13) of which 63 (b) Carrying values at June 30, 2019 and December 31, 2018 are net of unamortized debt issuance costs of approximately $22 and $25, respectively

Other Expense (Income) _ Net (T

Other Expense (Income) – Net (Tables)	6 Months Ended
	Jun. 30, 2019
Other Income And Expenses [Abstract]
Schedule of Other Expense (Income) - Net	Other expense (income) – net consisted of the following for the periods indicated: Three Months Ended Six Months Ended June 30, June 30, 2019 2018 2019 2018 Interest income $ (2 ) $ (3 ) $ (8 ) $ (22 ) Foreign currency losses (gains) – net 29 (54 ) 51 (99 ) Bank fees 23 24 48 43 Other – net 7 (19 ) (22 ) (20 ) $ 57 $ (52 ) $ 69 $ (98 )

Basis of Presentation - Additio

Basis of Presentation - Additional Information (Detail) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Dec. 31, 2018
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
State of incorporation	DE
Date of incorporation	Jan. 1, 2013
Contract liabilities ̶ net of current portion	$ 341	$ 527
Current portion of net investment in sales-type leases	293	302
Net investment in sales-type leases ̶ net of current portion	1,204	$ 1,351
Right-of-use assets	310
Lease liability	310
ASU 2016-02 [Member]
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Right-of-use assets	400
Lease liability	$ 400
Subsidiary Guarantors [Member]
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Percentage of ownership in subsidiary guarantors	100.00%

Liquidity - Additional Informat

Liquidity - Additional Information (Detail) - USD ($)	Mar. 12, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Dec. 31, 2018
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Net loss			$ (3,789,000)	$ (8,285,000)	$ (14,422,000)
Cash and cash equivalents			$ 5,462,000	$ 5,462,000		$ 5,462,000	$ 7,592,000
Initial And Secondary Public Offerings [Member]
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Cumulative unrestricted net proceeds from common stock						$ 168,361,000
Revolving Credit Facility [Member] | LBM Holdings, LLC [Member]
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Credit facility, expiration period	3 years	3 years
Line of credit facility, maximum borrowing capacity	$ 15,000,000	$ 15,000,000

Accumulated Other Comprehensi_3

Accumulated Other Comprehensive Loss - Summary of Changes in the Components of Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Statement Of Income And Comprehensive Income [Abstract]
Balance at beginning of period	$ (11,524)	$ (8,082)	$ (10,748)	$ (9,484)
Other comprehensive income (loss)	583	(2,240)	(193)	(838)
Balance at end of period	$ (10,941)	$ (10,322)	$ (10,941)	$ (10,322)

Accumulated Other Comprehensi_4

Accumulated Other Comprehensive Loss - Additional Information (Detail) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Statement Of Income And 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

Loss Per Share - Additional Inf

Loss Per Share - Additional Information (Detail) - shares	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Stock Option [Member]
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Potential shares of anti-dilutive common stock	608,787	536,635	608,787	536,635
Restricted Stock [Member]
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Potential shares of anti-dilutive common stock	96,264	52,502	96,264	52,502

Loss Per Share - Computation of

Loss Per Share - Computation of Basic and Diluted Loss Per Common Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018
Earnings Per Share [Abstract]
Net loss	$ (3,789)	$ (4,496)	$ (8,037)	$ (6,385)	$ (8,285)	$ (14,422)
Weighted average shares outstanding (basic and diluted)	16,301,157		16,149,617		16,278,043	16,144,092
Net loss per common share:
Basic	$ (0.23)		$ (0.50)		$ (0.51)	$ (0.89)
Diluted	$ (0.23)		$ (0.50)		$ (0.51)	$ (0.89)

Revenue - Summary of Revenue by

Revenue - Summary of Revenue by Product Group (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Revenue from External Customer [Line Items]
Revenue	$ 15,279	$ 10,857	$ 24,858	$ 22,750
3D Printing Machines [Member]
Revenue from External Customer [Line Items]
Revenue	9,231	3,213	12,560	7,734
3D Printed and Other Products, Materials and Services [Member]
Revenue from External Customer [Line Items]
Revenue	$ 6,048	$ 7,644	$ 12,298	$ 15,016

Revenue - Additional Informatio

Revenue - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Disaggregation Of Revenue [Line Items]
Revenue, description of payment terms			the Company’s terms of sale generally require payment within 30 to 60 days after delivery, although the Company also recognizes that longer payment periods are customary in certain countries where it transacts business.
Revenue recognized related to contract liabilities			$ 1,573
Revenue, remaining performance obligation	$ 23,100		23,100
Allowance for doubtful accounts	73		73		$ 225
Recoveries for bad debts ̶ net	$ 77	$ 46	$ 150	$ 37
Maximum [Member]
Disaggregation Of Revenue [Line Items]
Term till payment is required from date of shipment			60 days
Minimum [Member]
Disaggregation Of Revenue [Line Items]
Term till payment is required from date of shipment			30 days

Revenue - Additional Informat_2

Revenue - Additional Information (Detail 1) $ in Thousands	Jun. 30, 2019USD ($)
Disaggregation Of Revenue [Line Items]
Revenue, remaining performance obligation	$ 23,100
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2019-07-01
Disaggregation Of Revenue [Line Items]
Revenue, remaining performance obligation	$ 19,700
Revenue, remaining performance obligation, Expected timing of satisfaction, period	12 months

Restructuring - Additional Info

Restructuring - Additional Information (Detail) - USD ($)	3 Months Ended			6 Months Ended
	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Jun. 30, 2019	Jun. 30, 2018
Restructuring Cost And Reserve [Line Items]
Gain (loss) on disposal of assets				$ 2,000	$ 41,000
Desenzano Del Garada, Italy 3D Printing Operations [Member]
Restructuring Cost And Reserve [Line Items]
Involuntary employee terminations charges			$ 72,000
Total restructuring charges		$ 245,000
Other exit costs		17,000
Asset impairment charges	$ 13,000	$ 228,000
Gain (loss) on disposal of assets	51,000
Additional charges expected to be incurred	$ 0				$ 0
Desenzano Del Garada, Italy 3D Printing Operations [Member] | Cost of Sales [Member]
Restructuring Cost And Reserve [Line Items]
Involuntary employee terminations charges			19,000
Desenzano Del Garada, Italy 3D Printing Operations [Member] | Selling, General and Administrative Expenses [Member]
Restructuring Cost And Reserve [Line Items]
Involuntary employee terminations charges			$ 53,000

Impairment - Additional Informa

Impairment - Additional Information (Detail)	6 Months Ended
	Jun. 30, 2019USD ($)Asset_Group
Asset Impairment Charges [Abstract]
Number of operating asset groups | Asset_Group	3
Long-lived assets held for use impairment loss | $	$ 0

Cash, Cash Equivalents, and R_3

Cash, Cash Equivalents, and Restricted Cash - Schedule of Reconciliation of Cash, Cash Equivalents, and Restricted Cash (Detail) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Cash And Cash Equivalents [Abstract]
Cash and cash equivalents	$ 5,462	$ 7,592
Restricted cash	1,790	1,548
Cash, cash equivalents, and restricted cash	$ 7,252	$ 9,140

Cash, Cash Equivalents, and R_4

Cash, Cash Equivalents, and Restricted Cash - Additional Information (Detail) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Cash Cash Equivalents And Restricted Cash [Line Items]
Restricted cash associated with cash collateral	$ 1,790	$ 1,548
German Bank [Member]
Cash Cash Equivalents And Restricted Cash [Line Items]
Restricted cash associated with cash collateral	1,284	1,044
United States Bank [Member]
Cash Cash Equivalents And Restricted Cash [Line Items]
Restricted cash associated with cash collateral	$ 506	$ 504

Inventories - Schedule of Inven

Inventories - Schedule of Inventories (Detail) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Inventory Disclosure [Abstract]
Raw materials and components	$ 7,623	$ 7,747
Work in process	4,803	5,147
Finished goods	3,757	3,036
Inventories	$ 16,183	$ 15,930

Inventories - Additional Inform

Inventories - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2018	Jun. 30, 2019	Dec. 31, 2018
Inventory [Line Items]
Allowance for slow-moving and obsolete inventories		$ 4,149	$ 4,143
Industrial Microwave [Member]
Inventory [Line Items]
Inventory (credit) charge	$ 561

Product Warranty Reserves - Add

Product Warranty Reserves - Additional Information (Detail)	6 Months Ended
	Jun. 30, 2019
Product Warranties Disclosures [Abstract]
Standard product warranty period	Substantially all of the Company’s 3D printing machines are covered by a standard twelve- month warranty. Generally, at the time of sale, a liability is recorded (with an offset to cost of sales) based upon the expected cost of replacement parts and labor to be incurred over the life of the standard warranty.

Product Warranty Reserves - Sum

Product Warranty Reserves - Summary of Changes in Product Warranty Reserves (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Guarantees [Abstract]
Balance at beginning of period	$ 1,251	$ 1,148	$ 1,670	$ 1,300
Provisions for new issuances	383	167	529	386
Payments	(457)	(120)	(848)	(328)
Reserve adjustments	36	(252)	(123)	(439)
Foreign currency translation adjustments	10	(34)	(5)	(10)
Balance at end of period	$ 1,223	$ 909	$ 1,223	$ 909

Leases - Additional Information

Leases - Additional Information (Detail) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2019USD ($)	Jun. 30, 2019USD ($)
Leases [Line Items]
Lease expiration year		2026
Short term lease cost	$ 47	$ 112
Lease cost	$ 98	$ 211
Minimum [Member]
Leases [Line Items]
Operating lease arrangement terms	1 year	1 year
Maximum [Member]
Leases [Line Items]
Operating lease arrangement terms	5 years	5 years
Related Parties Under Common Control [Member]
Leases [Line Items]
Short term lease cost	$ 12	$ 24

Leases - Schedule of Future Min

Leases - Schedule of Future Minimum Lease Payments of Operating Leases Arrangements (Detail) $ in Thousands	Jun. 30, 2019USD ($)
Leases [Abstract]
2019	$ 90
2020	109
2021	72
2022	58
2023	9
Thereafter	4
Total minimum lease payments	342
Less: Present value discount	(32)
Total operating lease liabilities	$ 310

Leases - Schedule of Supplement

Leases - Schedule of Supplemental Information Related to Operating Lease Arrangements (Detail) $ in Thousands	6 Months Ended
	Jun. 30, 2019USD ($)
Leases [Abstract]
Operating lease right-of-use assets included in other noncurrent assets	$ 310
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	us-gaap:OtherAssetsNoncurrent
Operating lease liabilities included in accrued expenses and other current liabilities	$ 131
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	xone:AccruedExpensesAndOtherCurrentLiabilitiesMember
Operating lease liabilities included in other noncurrent liabilities	$ 179
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	us-gaap:OtherNoncurrentLiabilitiesMember
Right-of-use assets obtained in exchange for new operating lease liabilities	$ 9
Cash paid for amounts included in the measurement of operating lease liabilities	$ 99
Weighted average remaining lease term (in years)	3 years
Weighted average discount rate	6.50%

Leases - Future Minimum Lease P

Leases - Future Minimum Lease Payments of Operating Lease Arrangements (Detail) $ in Thousands	Dec. 31, 2018USD ($)
Leases [Abstract]
2019	$ 170
2020	111
2021	76
2022	67
2023	12
Thereafter	5
Future minimum lease payments of operating lease, Total	$ 441

Leases - Schedule of Operating

Leases - Schedule of Operating and Sales-type Lease Arrangements (Detail) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Leases [Abstract]
Operating lease revenue		$ 706	$ 251	$ 1,026	$ 452
Sales-type lease interest income	[1]	$ 27	$ 13	$ 55	$ 26
[1]	Interest income relating to sales-type leases is recorded as a component of revenue in the accompanying condensed statement of consolidated operations and comprehensive loss for each of the periods presented.

Leases - Schedule of Net Invest

Leases - Schedule of Net Investment in Sales-type Leases (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Leases [Abstract]
Future minimum lease payments receivable	$ 1,757
Less: Unearned interest income	(260)
Net investment in sales-type leases	$ 1,497
Future minimum lease payments receivable		$ 1,969
Less: Unearned interest income		(316)
Net investment in sales-type leases		$ 1,653

Leases - Schedule of Future M_2

Leases - Schedule of Future Minimum Lease Payment Receivable of Non-Cancellable Operating and Sales-type Lease (Details) $ in Thousands	Jun. 30, 2019USD ($)
Operating lease arrangements
2019	$ 566
2020	138
2021	48
Total minimum lease payments	752
Sales-type lease arrangements
2019	200
2020	381
2021	381
2022	381
2023	414
Total minimum lease payments	1,757
Less: Present value discount	(260)
Future minimum sales-type lease payments receivable	$ 1,497

Leases - Schedule of Future M_3

Leases - Schedule of Future Minimum Lease or Rental Payments of Non-Cancellable Operating and Sales-type Lease (Details) $ in Thousands	Dec. 31, 2018USD ($)
Operating lease arrangements
2019	$ 687
2020	148
2021	48
Operating leases, future minimum payments receivable	883
Sales-lease type arrangements
2019	409
2020	382
2021	382
2022	382
2023	414
Sales-type leases, future minimum payments receivable	$ 1,969

Contingencies and Commitments -

Contingencies and Commitments - Additional Information (Detail) - Germany [Member] - German Bank [Member] € in Thousands	6 Months Ended
	Jun. 30, 2019USD ($)	Jun. 30, 2019EUR (€)	Dec. 31, 2018USD ($)	Dec. 31, 2018EUR (€)
Line Of Credit Facility [Line Items]
Credit facility, maximum borrowing capacity	$ 1,400,000	€ 1,300
Credit facility, minimum increments	100,000	100
Credit facility, commitment fee	$ 0
Minimum [Member]
Line Of Credit Facility [Line Items]
Debt Instrument, term	30 days
Commercial Transactions Requiring Security [Member]
Line Of Credit Facility [Line Items]
Credit facility, interest rate	1.75%
Credit facility, outstanding amount			$ 1,044,000	€ 912
Commercial Transactions Requiring Security [Member] | Separate Agreements for Additional Capacity for Financial Guarantees and Letters of Credit [Member]
Line Of Credit Facility [Line Items]
Credit facility, outstanding amount	$ 91,000	80
Expiration date, description	February 2023
Overdraft Credit [Member]
Line Of Credit Facility [Line Items]
Credit facility, interest rate	10.20%
Outstanding borrowings in form of overdraft credit or short-term loans	$ 0		0
Short-Term Loans [Member]
Line Of Credit Facility [Line Items]
Outstanding borrowings in form of overdraft credit or short-term loans	0		$ 0
Commercial Transactions Requiring Security Expiring From July Twenty Nineteen Through November Twenty Nineteen [Member]
Line Of Credit Facility [Line Items]
Credit facility, outstanding amount	$ 1,284,000	€ 1,129
Expiration date, description	July 2019 through November 2019

Related Party Revolving Credi_2

Related Party Revolving Credit Facility - Additional Information (Detail) - USD ($)	Mar. 12, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Related Party Transaction [Line Items]
Amortization of debt issuance costs					$ 47,000	$ 27,000
Accounts payable			$ 5,339,000		5,339,000		$ 4,376,000
Revolving Credit Facility [Member] | Prepaid Expenses and Other Current Assets [Member]
Related Party Transaction [Line Items]
Debt issuance costs, net			88,000		88,000		88,000
Revolving Credit Facility [Member] | Other Noncurrent Assets [Member]
Related Party Transaction [Line Items]
Debt issuance costs, net			$ 63,000		$ 63,000		$ 107,000
Revolving Credit Facility [Member] | LBM Holdings, LLC [Member]
Related Party Transaction [Line Items]
Line of credit facility, maximum borrowing capacity	$ 15,000,000	$ 15,000,000
Credit facility, expiration period	3 years	3 years
Credit facility, expiration date	Mar. 12, 2021
Credit facility, description of variable rate basis					one month LIBOR
Credit facility, interest rate			7.40%		7.40%		7.50%
Credit facility, commitment fee on unused portion, percentage	0.75%
Credit facility, commitment fee on unused portion, payable term					The LBM Credit Agreement requires a commitment fee of 75 basis points, or 0.75%, on the unused portion of the facility, payable monthly in arrears.
Credit facility, up-front commitment fee percentage	1.25%
Credit facility, up-front commitment fee amount	$ 188,000
Credit facility, minimum increments	1,000,000
Available loan proceeds deposited into escrow account	$ 15,000,000
Credit facility, outstanding amount			$ 0		$ 0
Debt issuance costs			265,000		265,000
Interest expense relating to the Credit Agreement			50,000	$ 49,000	100,000	$ 59,000
Amortization of debt issuance costs			22,000		44,000
Debt issuance costs, net			151,000		151,000		$ 195,000
Interest expense relating to the commitment fee			28,000		56,000
Accounts payable			9,000		9,000		10,000
Revolving Credit Facility [Member] | LBM Holdings, LLC [Member] | Prepaid Expenses and Other Current Assets [Member]
Related Party Transaction [Line Items]
Debt issuance costs, net			88,000		88,000
Revolving Credit Facility [Member] | LBM Holdings, LLC [Member] | Other Noncurrent Assets [Member]
Related Party Transaction [Line Items]
Debt issuance costs, net			$ 63,000		$ 63,000		$ 107,000
Revolving Credit Facility [Member] | LBM Holdings, LLC [Member] | One Month LIBOR [Member]
Related Party Transaction [Line Items]
Credit facility, basis spread on variable rate	5.00%

Income Taxes - Additional Infor

Income Taxes - Additional Information (Detail) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Mar. 31, 2019	Dec. 31, 2018
Schedule Of Income Taxes [Line Items]
Provision (benefit) for income taxes	$ 99,000	$ 18,000	$ (701,000)	$ 35,000
Effective tax rate	2.70%	0.20%	7.80%	0.20%
United States statutory rate	21.00%	21.00%	21.00%	21.00%
Penalties and interest expense	$ 0	$ 0	$ 0	$ 0
Unrecognized tax benefits including accrued interest and penalties	$ 0		$ 0			$ 820,000
Subsidiaries [Member] | Local Taxing Authorities [Member] | Germany [Member]
Schedule Of Income Taxes [Line Items]
Reversal of previously recorded liabilities for uncertain tax positions					$ 1,075,000
Uncertain tax positions expected amount to be offset against net operating loss carryforwards					$ 257,000

Income Taxes - Reconciliation o

Income Taxes - Reconciliation of Unrecognized Tax Benefits (Including Accrued Interest and Penalties) (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Income Tax Disclosure [Abstract]
Balance at beginning of period	$ 102	$ 1,904	$ 1,186	$ 1,775
Additions for tax positions of prior years	1	60	2	118
Reductions for tax positions of prior years			(1,075)
Foreign currency translation adjustments	2	(93)	(8)	(22)
Balance at end of period	$ 105	$ 1,871	$ 105	$ 1,871

Equity-Based Compensation - Add

Equity-Based Compensation - Additional Information (Detail) - USD ($)	Jan. 24, 2013	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2019	Jun. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average remaining vesting period				1 year 2 months 12 days
Proceeds from exercise of employee stock options				$ 171,000
Unsettled proceeds from exercise of employee stock options				$ 91,000
Incentive stock options exercised				36,370	0
Cash payment for taxes relating to net settlement of equity based awards				$ 68,000	$ 0
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total future compensation expense		$ 541,000		541,000
Intrinsic value, stock options expected to vest		251,000		251,000
Intrinsic value, stock options exercisable		289,000		$ 289,000
Weighted average remaining contractual term of stock options exercisable				4 years 3 months 18 days
Weighted average remaining contractual term of stock options expected to vest				4 years 3 months 18 days
Intrinsic value of stock options exercised				$ 326,000
Proceeds from exercise of employee stock options				263,000
Income tax benefit				0
Unsettled proceeds from exercise of employee stock options				91,000
Incentive stock options exercised					0
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total future compensation expense		$ 498,000		498,000
Fair value of restricted shares vested				$ 356,000	$ 205,000
Maximum [Member] | Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period				3 years
Stock options contractual expiration period				10 years
Maximum [Member] | Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period				3 years
Minimum [Member] | Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period				1 year
Stock options contractual expiration period				5 years
Minimum [Member] | Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period				1 year
Common Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Incentive stock options exercised		13,000	23,000
2013 Equity Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock reserved for issuance	500,000
Remaining shares available for future issuance		865,506		865,506
2013 Equity Incentive Plan [Member] | Common Stock [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of outstanding shares of common stock	3.00%
Number of Shares authorized	1,992,241

Equity-Based Compensation - Sum

Equity-Based Compensation - Summary of Equity-Based Compensation Expense (Detail) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Equity-based compensation expense recognized:
Total equity-based compensation expense before income taxes		$ 642	$ (5)	$ 1,081	$ 374
Benefit for income taxes	[1]	0	0	0	0
Total equity-based compensation expense net of income taxes		642	(5)	1,081	374
Stock Options [Member]
Equity-based compensation expense recognized:
Total equity-based compensation expense before income taxes		150	(175)	316	28
Restricted Stock [Member]
Equity-based compensation expense recognized:
Total equity-based compensation expense before income taxes		245	100	374	206
Other [Member]
Equity-based compensation expense recognized:
Total equity-based compensation expense before income taxes	[2]	$ 247	$ 70	$ 391	$ 140
[1]	The benefit for income taxes from equity-based compensation for each of the periods presented has been determined to be $0 based on valuation allowances against net deferred tax assets.
[2]	Other represents expense associated with the Program and other employee contractual amounts to be settled in equity.

Equity-Based Compensation - S_2

Equity-Based Compensation - Summary of Equity-Based Compensation Expense (Parenthetical) (Detail) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Benefit for income taxes from equity-based compensation	[1]	$ 0	$ 0	$ 0	$ 0
[1]	The benefit for income taxes from equity-based compensation for each of the periods presented has been determined to be $0 based on valuation allowances against net deferred tax assets.

Equity-Based Compensation - Ass

Equity-Based Compensation - Assumptions for Fair Value of Stock Options Granted Estimated on the Date of Grant Using the Black-Scholes Option (Detail) - Stock Options [Member] - $ / shares	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average fair value per stock option		$ 3.77
Volatility		62.60%
Average risk-free interest rate		2.50%
Dividend yield	0.00%	0.00%
Expected term (years)		3 years 3 months 19 days
Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average fair value per stock option	$ 3.48
Volatility	54.00%
Average risk-free interest rate	2.20%
Expected term (years)	2 years 6 months
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average fair value per stock option	$ 3.68
Volatility	60.10%
Average risk-free interest rate	2.50%
Expected term (years)	3 years 6 months

Equity-Based Compensation - S_3

Equity-Based Compensation - Summary of Activity for Stock Options (Detail)	6 Months Ended
	Jun. 30, 2019$ / sharesshares	Jun. 30, 2018$ / sharesshares
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Stock options outstanding, Beginning balance | shares	621,986	674,470
Stock options granted | shares	57,610	24,000
Stock options exercised | shares	(36,370)	0
Stock options forfeited | shares	(9,773)	(133,835)
Stock options expired | shares	(24,666)	(28,000)
Stock options outstanding, Ending balance | shares	608,787	536,635
Stock options exercisable at end of period | shares	385,709	396,627
Stock options expected to vest at end of period | shares	223,078	140,008
Weighted average exercise price, Beginning balance	$ 10.66	$ 11.58
Weighted average exercise price, Stock options granted	8.33	8.36
Weighted average exercise price, Stock options exercised	7.22	0
Weighted average exercise price, Stock options forfeited	7.67	9.44
Weighted average exercise price, Stock options expired	17.10	10.03
Weighted average exercise price, Ending balance	10.43	12.05
Weighted average exercise price, Stock options exercisable	11.56	13.14
Weighted average exercise price, Stock options expected to vest, net of forfeitures	8.48	8.96
Weighted average grant date fair value, Beginning balance	5.52	6.41
Weighted average grant date fair value, Stock options granted	3.67	3.77
Weighted average grant date fair value, Stock options exercised	3.03	0
Weighted average grant date fair value, Stock options forfeited	3.70	5.15
Weighted average grant date fair value, Stock options expired	10.45	5.19
Weighted average grant date fair value, Ending balance	5.33	6.68
Weighted average grant date fair value, Stock options exercisable	6.20	7.53
Weighted average grant date fair value, Stock options expected to vest, net of forfeitures	$ 3.82	$ 4.29

Equity-Based Compensation - S_4

Equity-Based Compensation - Summary of Activity for Restricted Stock Awards (Detail) - Restricted Stock [Member] - $ / shares	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Restricted Shares, outstanding, Beginning Balance	67,001	52,502
Number of Restricted Shares, granted	66,763	25,000
Number of Restricted Shares, vested	(37,500)	(25,000)
Number of Restricted Shares, forfeited	0	0
Number of Restricted Shares, outstanding, Ending Balance	96,264	52,502
Number of Restricted Shares, expected to vest	96,264	52,502
Weighted Average Grant Date Fair Value, Beginning Balance	$ 8.30	$ 11.07
Weighted Average Grant Date Fair Value, granted	8.98	8.21
Weighted Average Grant Date Fair Value, vested	8.12	10.10
Weighted Average Grant Date Fair Value, forfeited	0	0
Weighted Average Grant Date Fair Value, Ending Balance	8.84	10.17
Weighted Average Grant Date Fair Value, expected to vest	$ 8.84	$ 10.17

Fair Value Measurements - Addit

Fair Value Measurements - Additional Information (Detail) - USD ($)	Jun. 30, 2019	Dec. 31, 2018
Fair Value Disclosures [Abstract]
Financial instruments (assets or liabilities) measured at fair value	$ 0	$ 0

Fair Value Measurements - Carry

Fair Value Measurements - Carrying Values and Fair Values of Other Financial Instruments (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Jun. 30, 2018
Carrying Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	$ 7,592	$ 5,462
Restricted cash	1,548	1,790
Debt issuance costs	195	151
Current portion of long-term debt	144	149
Long-term debt ̶ net of current portion	1,364	1,288
Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	7,592	5,462
Restricted cash	1,548	1,790
Current portion of long-term debt	149	153
Long-term debt ̶ net of current portion	$ 1,384	$ 1,306

Fair Value Measurements - Car_2

Fair Value Measurements - Carrying Values and Fair Values of Other Financial Instruments (Parenthetical) (Detail) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Unamortized debt issuance costs	$ 22	$ 25
Revolving Credit Facility [Member] | Prepaid Expenses and Other Current Assets [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt issuance costs	88	88
Revolving Credit Facility [Member] | Other Noncurrent Assets [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt issuance costs	$ 63	$ 107

Concentration of Credit Risk -

Concentration of Credit Risk - Additional Information (Detail) - Five Most Significant Customers [Member] - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Revenue, Major Customer [Line Items]
Accounts receivable from significant customers	$ 1,681		$ 1,681		$ 2,344
Customer Concentration Risk [Member] | Sales Revenue, Net [Member]
Revenue, Major Customer [Line Items]
Revenue concentration, by most significant customers	46.40%	33.00%	33.00%	25.20%

Related Party Transactions - Ad

Related Party Transactions - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Accounts Payable [Member]
Related Party Transaction [Line Items]
Amounts due to related party	$ 0		$ 0		$ 1
Chairman of the Board of Directors [Member]
Related Party Transaction [Line Items]
Purchases from related parties	43	$ 6	58	$ 12
Fair market value of benefits received	3	$ 0	$ 3	$ 0
Chairman of the Board of Directors [Member] | 3D Printing Machine and Ancillary Equipment [Member]
Related Party Transaction [Line Items]
Purchases from related parties	$ 30

Other Expense (Income) - Net -

Other Expense (Income) - Net - Schedule of Other Expense (Income) - Net (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Other Income And Expenses [Abstract]
Interest income	$ (2)	$ (3)	$ (8)	$ (22)
Foreign currency losses (gains) – net	29	(54)	51	(99)
Bank fees	23	24	48	43
Other – net	7	(19)	(22)	(20)
Other expense (income) - net	$ 57	$ (52)	$ 69	$ (98)