ExOne (XONE) 10-Q 8 Nov 18 2018 Q3 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2018	Nov. 08, 2018
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2018
Document Fiscal Year Focus	2,018
Document Fiscal Period Focus	Q3
Trading Symbol	XONE
Entity Registrant Name	ExOne Co
Entity Central Index Key	1,561,627
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	true
Entity Ex Transition Period	false
Entity Common Stock, Shares Outstanding		16,299,952

Condensed Statement of Consolid

Condensed Statement of Consolidated Operations and Comprehensive Loss - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Income Statement [Abstract]
Revenue	$ 16,589	$ 15,887	$ 39,339	$ 37,555
Cost of sales	10,016	11,790	28,560	29,829
Gross profit	6,573	4,097	10,779	7,726
Operating expenses
Research and development	2,444	2,871	8,474	7,219
Selling, general and administrative	5,200	6,062	17,755	18,338
Total operating expenses	7,644	8,933	26,229	25,557
Loss from operations	(1,071)	(4,836)	(15,450)	(17,831)
Other (income) expense
Interest expense	73	24	179	69
Other (income) expense ̶ net	(838)	(11)	(936)	134
Total other (income) expense	(765)	13	(757)	203
Loss before income taxes	(306)	(4,849)	(14,693)	(18,034)
Provision for income taxes	17	14	52	23
Net loss	$ (323)	$ (4,863)	$ (14,745)	$ (18,057)
Net loss per common share:
Basic	$ (0.02)	$ (0.30)	$ (0.91)	$ (1.13)
Diluted	$ (0.02)	$ (0.30)	$ (0.91)	$ (1.13)
Comprehensive loss:
Net loss	$ (323)	$ (4,863)	$ (14,745)	$ (18,057)
Other comprehensive (loss) income:
Foreign currency translation adjustments	(429)	1,194	(1,267)	4,713
Comprehensive loss	$ (752)	$ (3,669)	$ (16,012)	$ (13,344)

Condensed Consolidated Balance

Condensed Consolidated Balance Sheet - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 10,705	$ 21,848
Restricted cash	1,312	330
Accounts receivable ̶ net of allowance of $686 (2018) and $1,193 (2017)	5,384	8,647
Inventories ̶ net	20,719	15,430
Prepaid expenses and other current assets	3,585	1,710
Total current assets	41,705	47,965
Property and equipment ̶ net	42,917	46,797
Intangible assets ̶ net		62
Other noncurrent assets	692	736
Total assets	85,314	95,560
Current liabilities:
Current portion of long-term debt	142	137
Current portion of capital leases	14	15
Accounts payable	3,534	4,291
Accrued expenses and other current liabilities	5,681	6,081
Deferred revenue and customer prepayments	14,129	8,282
Total current liabilities	23,500	18,806
Long-term debt ̶ net of current portion	1,401	1,508
Capital leases ̶ net of current portion	38	36
Other noncurrent liabilities	1	1
Total liabilities	24,940	20,351
Contingencies and commitments
Stockholders' equity
Common stock, $0.01 par value, 200,000,000 shares authorized, 16,232,951 (2018) and 16,124,617 (2017) shares issued and outstanding	162	161
Additional paid-in capital	174,894	173,718
Accumulated deficit	(103,931)	(89,186)
Accumulated other comprehensive loss	(10,751)	(9,484)
Total stockholders' equity	60,374	75,209
Total liabilities and stockholders' equity	$ 85,314	$ 95,560

Condensed Consolidated Balanc_2

Condensed Consolidated Balance Sheet (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Statement Of Financial Position [Abstract]
Allowance for accounts receivable	$ 686	$ 1,193
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	200,000,000	200,000,000
Common stock, shares issued	16,232,951	16,124,617
Common stock, shares outstanding	16,232,951	16,124,617

Condensed Statement of Consol_2

Condensed Statement of Consolidated Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Operating activities
Net loss	$ (14,745)	$ (18,057)
Adjustments to reconcile net loss to net cash used for operations:
Depreciation and amortization	4,039	4,966
Equity-based compensation	656	2,043
Amortization of debt issuance costs	52	4
Recoveries for bad debts ̶ net	(40)	(51)
Provision for slow-moving, obsolete and lower of cost or net realizable value inventories ̶ net	910	1,872
Gain from disposal of property and equipment ̶ net	(33)	(322)
Changes in assets and liabilities, excluding effects of foreign currency translation adjustments:
Decrease in accounts receivable	3,166	288
Increase in inventories	(7,458)	(2,772)
Increase in prepaid expenses and other assets	(761)	(1,438)
(Decrease) increase in accounts payable	(637)	2,032
Decrease in accrued expenses and other liabilities	(206)	(522)
Increase (decrease) in deferred revenue and customer prepayments	6,168	(938)
Net cash used for operating activities	(8,889)	(12,895)
Investing activities
Capital expenditures	(1,192)	(874)
Proceeds from sale of property and equipment	77	3,702
Net cash (used for) provided by investing activities	(1,115)	2,828
Financing activities
Payments on long-term debt	(106)	(102)
Payments on capital leases	(13)	(64)
Debt issuance costs	(265)
Proceeds from exercise of employee stock options	521
Net cash provided by (used for) financing activities	137	(166)
Effect of exchange rate changes on cash, cash equivalents, and restricted cash	(294)	882
Net change in cash, cash equivalents, and restricted cash	(10,161)	(9,351)
Cash, cash equivalents, and restricted cash at beginning of period	22,178	28,155
Cash, cash equivalents, and restricted cash at end of period	12,017	18,804
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	1,521	2,363
Transfer of internally developed 3D printing machines from property and equipment to inventories for sale	847	597
Property and equipment included in assets held for sale (Note 5)	822
Property and equipment acquired through financing arrangements	14	48
Property and equipment included in accounts payable	48	94
Property and equipment included in accrued expenses and other current liabilities	$ 4	84
Advance deposits on property and equipment		$ 12

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, 2016	$ 87,780	$ 160	$ 171,116	$ (68,761)	$ (14,735)
Beginning Balance, Shares at Dec. 31, 2016		16,017,000
Cumulative-effect adjustment due to the adoption of Financial Accounting Standards Board Accounting Standards Update 2016-16	(408)			(408)
Net loss	(6,791)			(6,791)
Other comprehensive income (loss)	1,026				1,026
Equity-based compensation	561		561
Common stock issued from equity incentive plan, shares		29,000
Ending Balance at Mar. 31, 2017	82,168	$ 160	171,677	(75,960)	(13,709)
Ending Balance, Shares at Mar. 31, 2017		16,046,000
Beginning Balance at Dec. 31, 2016	87,780	$ 160	171,116	(68,761)	(14,735)
Beginning Balance, Shares at Dec. 31, 2016		16,017,000
Net loss	$ (18,057)
Exercise of employee stock options, shares	0
Ending Balance at Sep. 30, 2017	$ 76,071	$ 161	173,158	(87,226)	(10,022)
Ending Balance, Shares at Sep. 30, 2017		16,092,000
Beginning Balance at Dec. 31, 2016	87,780	$ 160	171,116	(68,761)	(14,735)
Beginning Balance, Shares at Dec. 31, 2016		16,017,000
Ending Balance at Dec. 31, 2017	$ 75,209	$ 161	173,718	(89,186)	(9,484)
Ending Balance, Shares at Dec. 31, 2017	16,124,617	16,125,000
Beginning Balance at Mar. 31, 2017	$ 82,168	$ 160	171,677	(75,960)	(13,709)
Beginning Balance, Shares at Mar. 31, 2017		16,046,000
Net loss	(6,403)			(6,403)
Other comprehensive income (loss)	2,493				2,493
Equity-based compensation	274		274
Ending Balance at Jun. 30, 2017	78,532	$ 160	171,951	(82,363)	(11,216)
Ending Balance, Shares at Jun. 30, 2017		16,046,000
Net loss	(4,863)			(4,863)
Other comprehensive income (loss)	1,194				1,194
Equity-based compensation	1,208	$ 1	1,207
Common stock issued from equity incentive plan, shares		46,000
Ending Balance at Sep. 30, 2017	76,071	$ 161	173,158	(87,226)	(10,022)
Ending Balance, Shares at Sep. 30, 2017		16,092,000
Beginning Balance at Dec. 31, 2017	$ 75,209	$ 161	173,718	(89,186)	(9,484)
Beginning Balance, Shares at Dec. 31, 2017	16,124,617	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	16,124,617	16,125,000
Net loss	$ (14,745)
Exercise of employee stock options, shares	65,833
Ending Balance at Sep. 30, 2018	$ 60,374	$ 162	174,894	(103,931)	(10,751)
Ending Balance, Shares at Sep. 30, 2018	16,232,951	16,233,000
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
Net loss	(323)			(323)
Other comprehensive income (loss)	(429)				(429)
Equity-based compensation	282		282
Exercise of employee stock options	521	$ 1	520
Exercise of employee stock options, shares		66,000
Common stock issued from equity incentive plan, shares		17,000
Ending Balance at Sep. 30, 2018	$ 60,374	$ 162	$ 174,894	$ (103,931)	$ (10,751)
Ending Balance, Shares at Sep. 30, 2018	16,232,951	16,233,000

Basis of Presentation

Basis of Presentation	9 Months Ended
	Sep. 30, 2018
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); ExOne Italy S.r.l (Italy); and through December 2017, ExOne Sweden AB (Sweden). 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. 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, 2017 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, 2017, 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. Recently Adopted Accounting Guidance On January 1, 2018, the Company adopted ASU 2017-09, “Compensation – Stock Compensation: Scope of Modification Accounting.” This ASU requires registrants to apply modification accounting unless three specific criteria are met. The three criteria are: the fair value of the award is the same before and after the modification, the vesting conditions are the same before and after the modification and the classification as a debt or equity award is the same before and after the modification. Management has determined that the adoption of this ASU did not have an impact on the consolidated financial statements of the Company. On January 1, 2017, the Company adopted FASB ASU 2016-16, “Income Taxes: Intra-Entity Transfers of Assets Other Than Inventory.” This ASU modifies existing guidance and is intended to reduce diversity in practice with respect to the accounting for the income tax consequences of intra-entity transfers of assets. The ASU indicates that the former exception to income tax accounting that requires companies to defer the income tax effects of certain intercompany transactions would apply only to intercompany inventory transactions. That is, the exception no longer applies to intercompany sales and transfers of other assets ( e.g. e.g. 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 February 2016, the FASB issued ASU 2016-02, “Leases.” As a result of this ASU, lessees will be required to recognize the following for all leases (with the exception of short-term leases) 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. As a result of this ASU, lessor accounting is largely unchanged and lessees will no longer be provided with a source of off-balance sheet financing. This ASU becomes effective for the Company on January 1, 2019. Early adoption is permitted. Lessees (for capital and operating leases) and lessors (for sales-type, direct financing, and operating leases) must apply a modified retrospective transition approach for leases existing at, or entered into after, the beginning of the earliest comparative period presented in the consolidated financial statements. The modified retrospective approach would not require any transition accounting for leases that expired before the earliest comparative period presented. Lessees and lessors may not apply a full retrospective transition approach. Management is currently evaluating the potential impact of this ASU on the consolidated financial statements of the Company. In May 2014, the FASB issued 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 contract(s) with a customer, identify the performance obligations in the contract(s), determine the transaction price, allocate the transaction price to the performance obligations in the contract(s), and recognize revenue when, or as, the entity satisfies a performance obligation. In August 2015, the FASB issued ASU 2015-14, “Revenue from Contracts with Customers: Deferral of the Effective Date,” which deferred the effective date of this guidance for the Company until January 1, 2019. The Company plans to utilize the modified retrospective method in connection with its future adoption of this ASU, as amended. Management is currently evaluating the potential impact of these collective changes on the consolidated financial statements of the Company. This evaluation includes the use of a third party consultant in assessing each of the Company’s revenue streams and determining the potential impact the new guidance may have on its accounting and reporting. Other than the periodic disclosures introduced by this ASU, as amended, the Company does not expect a significant impact on the consolidated financial statements of the Company.

Liquidity

Liquidity	9 Months Ended
	Sep. 30, 2018
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 $323 and $14,745 for the three months and nine months ended September 30, 2018, respectively. At September 30, 2018, the Company had approximately $10,705 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. Most recently, the Company received approximately $595 in unrestricted net proceeds from the sale of its common stock during the three months ended March 31, 2016 through an At Market Issuance Sales Agreement (“ATM”) with FBR Capital Markets & Co. (“FBR”) and MLV & Co. LLC (“MLV”) pursuant to which FBR and MLV agreed to act as distribution agents in the sale of up to $50,000 in the aggregate of ExOne common stock in “at the market offerings” as defined in Rule 415 under the Securities Act of 1933, as amended (the “Securities Act”) In March 2018 the Company entered into a three-year, $15,000 revolving credit facility with a related party (Note 11) to provide additional funding for working capital and general corporate purposes. In June 2018 the Company initiated a global cost realignment program focused on a reduction in the Company’s production overhead costs and operating expenses. 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 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	9 Months Ended
	Sep. 30, 2018
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: Three Months Ended Nine Months Ended September 30, September 30, Foreign currency translation adjustments 2018 2017 2018 2017 Balance at beginning of period $ (10,322 ) $ (11,216 ) $ (9,484 ) $ (14,735 ) Other comprehensive (loss) income (429 ) 1,194 (1,267 ) 4,713 Balance at end of period $ (10,751 ) $ (10,022 ) $ (10,751 ) $ (10,022 ) 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	9 Months Ended
	Sep. 30, 2018
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 nine months ended September 30, 2018 and 2017, 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 (513,970 – 2018 and 696,137 – 2017) and unvested restricted stock issued (67,001 – 2018 and 67,505 – 2017), was anti-dilutive. The information used to compute basic and diluted net loss per common share was as follows: Three Months Ended Nine Months Ended September 30, September 30, 2018 2017 2018 2017 Net loss $ (323 ) $ (4,863 ) $ (14,745 ) $ (18,057 ) Weighted average shares outstanding (basic and diluted) 16,182,818 16,069,453 16,157,143 16,048,257 Net loss per common share: Basic $ (0.02 ) $ (0.30 ) $ (0.91 ) $ (1.13 ) Diluted $ (0.02 ) $ (0.30 ) $ (0.91 ) $ (1.13 )

Restructuring

Restructuring	9 Months Ended
	Sep. 30, 2018
Restructuring And Related Activities [Abstract]
Restructuring	Note 5. Restructuring Houston, Texas In August 2018 the Company committed to a plan to consolidate certain of its three-dimensional (“3D”) printing operations from its Houston, Texas facility into its Troy, Michigan 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 September 30, 2018, the Company recorded a charge of approximately $28 split between cost of sales ($15) and selling, general and administrative expense ($13) associated with involuntary employee terminations related to this plan. During the three months ended September 30, 2018, the Company recorded an additional charge of approximately $1 (to cost of sales) associated with asset impairments related to this plan. 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 during the three months ended September 30, 2018. At September 30, 2018 the Company reclassified approximately $822 in property and equipment relating to the Houston, Texas facility (principally land and building) associated with certain assets meeting required criteria as held for sale (included in prepaid expenses and other current assets in the accompanying condensed consolidated balance sheet). Desenzano del Garda, Italy 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 additional charges 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 facility rentals during the six months ended June 30, 2018. North Las Vegas, Nevada and Chesterfield, Michigan In January 2017 the Company committed to a plan to consolidate certain of its 3D printing operations from its North Las Vegas, Nevada facility into its Troy, Michigan and Houston, Texas facilities and exit its non-core specialty machining operations in its Chesterfield, Michigan facility. These actions were taken as a result of t he accelerating adoption rate of the Company’s indirect printing technology in North America which resulted in a refocus of the Company’s operational strategy. As a result of these actions, during the three months ended March 31, 2017, the Company recorded charges of approximately $984, including approximately $110 associated with involuntary employee terminations, approximately $7 associated with other exit costs and approximately $867 associated with asset impairments. Charges associated with involuntary employee terminations and other exit costs were recorded to cost of sales in the accompanying condensed statement of consolidated operations and comprehensive loss. Charges associated with asset impairments were split between cost of sales ($598), as a component of depreciation expense, and selling, general and administrative expenses ($269), as a component of amortization expense, in the accompanying condensed statement of consolidated operations and comprehensive loss. During the three months ended June 30, 2017, the Company recorded an additional charge of approximately $32 associated with an additional involuntary employee termination which required a service commitment through April 2017. This charge was recorded to cost of sales in the accompanying condensed statement of operations and comprehensive loss. There are no additional charges expected to be incurred associated with this plan in future periods. Charges associated with asset impairments (described above) relate principally to the Company’s plan to exit its non-core specialty machining operations in its Chesterfield, Michigan facility. On April 21, 2017, the Company sold to a third party certain assets associated with these operations including inventories (approximately $79), property and equipment (approximately $2,475) and other contractual rights (approximately $269). Total gross proceeds from the sale of these assets were approximately $2,050. After deducting costs directly attributable to the sale of these assets (approximately $128), the Company recorded an impairment loss during the three months ended March 31, 2017, of approximately $859 split between property and equipment ($590) and intangible assets ($269) based on the excess of the carrying value over the estimated fair value of the related assets at March 31, 2017. During the three months ended June 30, 2017, the Company recorded a loss on disposal of approximately $42. Both the impairment loss and the loss on disposal were recorded to cost of sales in the accompanying condensed statement of consolidated operations and comprehensive loss. Separate from the transaction described above, on May 9, 2017, the Company sold to a third party certain property and equipment (principally land and building) associated with its North Las Vegas, Nevada facility. Total gross proceeds from the sale of these assets were approximately $1,950. After deducting costs directly attributable to the sale of these assets (approximately $137), the Company recorded a gain on disposal (recorded to cost of sales in the accompanying condensed statement of consolidated operations and comprehensive loss) during the three months ended June 30, 2017, of approximately $347. Additionally, the Company recorded an impairment loss during the three months ended March 31, 2017, of approximately $8 associated with certain property and equipment which was abandoned in connection with the Company’s exit of its North Las Vegas, Nevada facility.

Impairment

Impairment	9 Months Ended
	Sep. 30, 2018
Asset Impairment Charges [Abstract]
Impairment	Note 6. Impairment During the three months ended September 30, 2018, 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, which could result 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	9 Months Ended
	Sep. 30, 2018
Cash And Cash Equivalents [Abstract]
Cash, Cash Equivalents, and Restricted Cash	Note 7. 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: September 30, December 31, 2018 2017 Cash and cash equivalents $ 10,705 $ 21,848 Restricted cash 1,312 330 Cash, cash equivalents, and restricted cash $ 12,017 $ 22,178 Restricted cash at September 30, 2018 includes approximately $812 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 10). Restricted cash at September 30, 2018 and December 31, 2017 includes approximately $500 and $330, 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	9 Months Ended
	Sep. 30, 2018
Inventory Disclosure [Abstract]
Inventories	Note 8. Inventories Inventories consist of the following: September 30, December 31, 2018 2017 Raw materials and components $ 8,632 $ 7,171 Work in process 5,402 4,630 Finished goods 6,685 3,629 $ 20,719 $ 15,430 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 September 30, 2018 and December 31, 2017, the allowance for slow-moving and obsolete inventories was approximately $4,079 and $3,437, 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. During the three months ended June 30, 2017, the Company recorded a charge of approximately $1,460 to cost of sales in the accompanying condensed statement of consolidated operations and comprehensive loss attributable to certain raw material and component inventories (principally machine frames and other fabricated components) associated with the Company’s Exerial 3D printing machine platform based on decisions made by the Company during the period related to certain design changes to the underlying platform (rendering certain elements of the previous design obsolete). During the three months and nine months ended September 30, 2018, the Company recorded a net charge of approximately $59 and $29, respectively, to cost of sales in the accompanying condensed statement of consolidated operations and comprehensive loss associated with certain inventories for which cost was determined to exceed net realizable value. During the three months and nine months ended September 30, 2017, the Company recorded a net (credit) charge of approximately ($11) and $116, respectively, to cost of sales in the accompanying condensed statement of consolidated operations and comprehensive loss associated with certain inventories for which cost was determined to exceed net realizable value.

Product Warranty Reserves

Product Warranty Reserves	9 Months Ended
	Sep. 30, 2018
Product Warranties Disclosures [Abstract]
Product Warranty Reserves	Note 9. 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 (such amounts were reflected in accrued expenses and other current liabilities in the accompanying condensed consolidated balance sheet for each respective period): Three Months Ended Nine Months Ended September 30, September 30, 2018 2017 2018 2017 Balance at beginning of period $ 909 $ 1,075 $ 1,300 $ 1,115 Provisions for new issuances 445 243 831 763 Payments (236 ) (174 ) (564 ) (427 ) Reserve adjustments (103 ) (100 ) (542 ) (466 ) Foreign currency translation adjustments (11 ) 14 (21 ) 73 Balance at end of period $ 1,004 $ 1,058 $ 1,004 $ 1,058

Contingencies and Commitments

Contingencies and Commitments	9 Months Ended
	Sep. 30, 2018
Commitments And Contingencies Disclosure [Abstract]
Contingencies and Commitments	Note 10. Contingencies and Commitments Contingencies On March 1, 2018, the Company’s ExOne GmbH subsidiary notified Voxeljet AG that it has 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. On July 1, 2017, the Company (through its ExOne GmbH subsidiary) entered into a Settlement Agreement with Kocel Foundry Limited (also known as Kocel CSR Casting Company, Limited) and Kocel Group (Hong Kong) Limited (collectively, “Kocel”) relating to settlement of the arbitration case (no. 100019-2017) administered by the Swiss Chambers’ Arbitration Institution Notice of Arbitration, as filed by the Company on January 25, 2017. Among other things, the Settlement Agreement provided for a cash payment from ExOne GmbH to Kocel of approximately $811 and a settlement and release of claims related to a sales agreement between the parties for certain 3D printing machines and related equipment (the “Sales Agreement”). Based on the terms of the Settlement Agreement, including the final acceptance by Kocel of the 3D printing machines and related equipment, and relief from further obligation, liability or warranty for both parties (excluding certain intellectual property considerations), the Company recorded revenue of approximately $2,762 associated with the Sales Agreement (net of the cash payment made by ExOne GmbH to Kocel on July 5, 2017 described above) and the related cost of sales, during the three months ended September 30, 2017. The Company is 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 $1,500 (€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 days. The overdraft credit interest rate is fixed at 10.2% while the interest rate associated with commercial transactions requiring security (financial guarantees, letters of credit or collateral security) is fixed at 1.75%. The credit facility has an indefinite term and is subject to cancellation by either party at any time upon repayment of amounts outstanding or expiration of commercial transactions requiring security. There is no commitment fee associated with the credit facility. There are no negative covenants associated with the credit facility. The credit facility has been guaranteed by the Company. At September 30, 2018 and December 31, 2017, there were no outstanding borrowings in the form of overdraft credit or short-term loans under the credit facility. At September 30, 2018, total outstanding financial guarantees and letters of credit issued by ExOne GmbH under the credit facility were approximately $812 (€699) with expiration dates ranging from through November 2019. At December 31, 2017, total outstanding financial guarantees and letters of credit issued by ExOne GmbH under the credit facility were approximately $1,128 (€941). In connection with the related party revolving credit facility agreement entered into by the Company on March 12, 2018 (Note 11), the Company was required to post cash collateral against outstanding financial guarantees and letters of credit associated with the credit facility (Note 7). 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 September 30, 2018, ExOne GmbH had a singular financial guarantee outstanding under a separate agreement for approximately $93 (€80) with an expiration date of June 2022. 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	9 Months Ended
	Sep. 30, 2018
Related Party Transactions [Abstract]
Related Party Revolving Credit Facility	Note 11. 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 effective June 20, 2018, became the Chairman and Chief Executive Officer of the Company, relating to a $15,000 revolving credit facility (the “LBM Credit Agreement”) to provide additional funding for working capital and general corporate purposes. The LBM Credit Agreement provides for a term of three years (through March 12, 2021) and bears interest at a rate of one month LIBOR plus an applicable margin of 500 basis points (approximately 6.7% and 7.3% at inception and September 30, 2018, respectively). 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. In addition, an up-front commitment fee of 125 basis points, or 1.25% (approximately $188), was required at closing. Borrowings under the LBM Credit Agreement are required to be in minimum increments of $1,000. ExOne may terminate or reduce the credit commitment at any time during the term of the LBM Credit Agreement without penalty. ExOne may also make prepayments against outstanding borrowings under the LBM Credit Agreement at any time without penalty. Borrowings under the LBM Credit Agreement have been collateralized by the accounts receivable, inventories and machinery and equipment of the Loan Parties. At inception of the credit facility and September 30, 2018 the total estimated value of collateral was in significant excess of the maximum borrowing capacity under the LBM Credit Agreement. 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, who was the Executive Chairman of the Company at the time the Company entered into the LBM Credit Agreement and effective June 20, 2018, became the Chairman and Chief Executive Officer of the Company. 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 subject to review and approval by a sub-committee of independent members of the ExOne Board of Directors (the “Board”) (which included each of the members of the Audit Committee of the Board). At the time of execution of the LBM Credit Agreement, the $15,000 in available loan proceeds were 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 LBM Credit Agreement. There were no borrowings by the Company under the LBM Credit Agreement from March 12, 2018 (inception) through September 30, 2018. 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 nine months ended September 30, 2018, the Company recorded interest expense relating to the LBM Credit Agreement of approximately $51 and $110, respectively. Included in interest expense for the three months and nine months ended September 30, 2018 was approximately $23 and $48, respectively, associated with amortization of debt issuance costs (resulting in approximately $217 in remaining debt issuance costs at September 30, 2018, of which $88 was included in prepaid expenses and other current assets and $129 was included in other noncurrent assets in the accompanying condensed consolidated balance sheet). Included in interest expense for the three months and nine months ended September 30, 2018 was approximately $28 and $62, respectively, associated with the commitment fee on the unused portion of the revolving credit facility, of which at September 30, 2018 approximately $9 was included in accounts payable in the accompanying condensed consolidated balance sheet. Amounts payable to LBM at September 30, 2018 were settled by the Company in October 2018.

Income Taxes

Income Taxes	9 Months Ended
	Sep. 30, 2018
Income Tax Disclosure [Abstract]
Income Taxes	Note 12. Income Taxes The provision for income taxes for the three months ended September 30, 2018 and 2017 was approximately $17 and $14, respectively. The provision for income taxes for the nine months ended September 30, 2018 and 2017 was approximately $52 and $23, respectively. The Company has completed a discrete period computation of its provision 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 September 30, 2018 and 2017 was 5.6% (provision on a loss) and 0.3% (provision on a loss), respectively. The effective tax rate for the nine months ended September 30, 2018 and 2017 was 0.4% (provision on a loss) and 0.1% (provision on a loss), respectively. The effective tax rate differs from the United States federal statutory rate of 21.0% (2018) and 34.0% (2017) for each of the periods presented primarily due to net changes in valuation allowances for the periods. In December 2017, the Tax Cuts and Jobs Act (the “Tax Act”) was enacted into law. The Tax Act reduces the corporate income tax rate from 34.0% to 21.0% and generally modifies certain United States income tax deductions and the United States taxation of certain foreign earnings, among other changes. The Company is required to recognize the effect of tax law changes in the period of enactment. As a result of the Tax Act, the Company re-measured its United States deferred tax assets and liabilities as well as its valuation allowance against its net United States deferred tax assets at December 31, 2017. In December 2017, the SEC staff issued Staff Accounting Bulletin No. 118: Income Tax Accounting Implications of the 2017 Tax Cuts and Jobs Act (“SAB 118”), which allows the Company to record provisional amounts during a measurement period not to extend beyond one year of the enactment date. As ongoing guidance and accounting interpretations are expected over the next year, the Company considers its accounting of the deferred tax re-measurements and other items to be incomplete due to the forthcoming guidance and its ongoing analysis of final December 31, 2017 data and tax positions. No provisional amounts have been recorded by the Company. The Company expects to complete its analysis within the measurement period in accordance with SAB 118. 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 capitalized expenses and intercompany transactions. At September 30, 2018 and December 31, 2017, the liability for uncertain tax positions was approximately $831 and $858, respectively, and was included in accrued expenses and other current liabilities in the accompanying condensed consolidated balance sheet. At September 30, 2018 and December 31, 2017, the Company had an additional liability for uncertain tax positions related to its ExOne GmbH (Germany) subsidiary of approximately $357 and $323, respectively, which were fully offset against net operating loss carryforwards. At September 30, 2018 and December 31, 2017, the Company had an additional liability for uncertain tax positions related to its ExOne KK (Japan) subsidiary of approximately $218 and $594, respectively, which were fully offset against net operating loss carryforwards. At September 30, 2018, the Company’s ExOne GmbH (2010-2013) and ExOne Property GmbH (2013) subsidiaries were under examination by local taxing authorities. The Company is unable to reasonably predict an outcome related to this examination, the result of which may be material in a future period to the financial position, results from operations and cash flows of the Company.

Equity-Based Compensation

Equity-Based Compensation	9 Months Ended
	Sep. 30, 2018
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Equity-Based Compensation	Note 13. 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 will not exceed 1,992,241 shares, subject to certain adjustments. The maximum number of shares of common stock are currently reserved for 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 provides an opportunity for performance-based compensation to senior executive officers of the Company, among others. The target annual incentive for each Program participant is expressed as a percentage of base salary and is 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 retains negative discretion over amounts payable under the Program. For 2018, the total target amount payable under the Program is approximately $1,423, with certain amounts to be settled with participants in cash, equity or a combination thereof. During the three months and nine months ended September 30, 2018, total compensation expense associated with the Program was approximately $159 and $464, respectively, split between cost of sales ($30 and $75, respectively), research and development ($19 and $109, respectively) and selling general and administrative expenses ($110 and $280, respectively) in the accompanying condensed statement of consolidated operations The following table summarizes the total equity-based compensation expense recognized by the Company: Three Months Ended Nine Months Ended September 30, September 30, 2018 2017 2018 2017 Equity-based compensation expense recognized: Stock options $ 103 $ 768 $ 131 $ 1,244 Restricted stock 108 440 314 799 Other (a) 71 — 211 — Total equity-based compensation expense before income taxes 282 1,208 656 2,043 Benefit for income taxes (b) — — — — Total equity-based compensation expense net of income taxes $ 282 $ 1,208 $ 656 $ 2,043 (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 September 30, 2018, total future compensation expense related to unvested awards yet to be recognized by the Company was approximately $497 for stock options and $391 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 1.5 years. During the nine months ended September 30, 2018, 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: August 13, 2018 March 16, 2018 Weighted average fair value per stock option $3.01 $3.77 Volatility 63.67% 62.58% Average risk-free interest rate 2.66% 2.45% Dividend yield 0.00% 0.00% Expected term (years) 3.1 3.3 During the nine months ended September 30, 2017, 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: August 14, 2017 February 10, 2017 Weighted average fair value per stock option $3.28 - $4.38 $5.46 - $5.75 Volatility 61.68% - 67.92% 62.89% - 63.75% Average risk-free interest rate 1.40% - 1.82% 1.89% - 1.94% Dividend yield 0.00% 0.00% Expected term (years) 2.5 - 5.5 5.0 - 5.5 For certain stock option awards, volatility is estimated based on the historical volatility of the Company when the expected term of the award is less than the period for which the Company has been publicly traded. For certain stock option awards, volatility is estimated based on the historical volatilities of certain peer group companies when the expected term of the award exceeds the period for which the Company has been publicly traded. 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: Nine Months Ended September 30, 2018 2017 Number Options Weighted Weighted Average Grant Date Fair Value Number Options Weighted Weighted Average Grant Date Fair Value Outstanding at beginning of period 674,470 $ 11.58 $ 6.41 314,303 $ 15.62 $ 9.38 Stock options granted 147,500 $ 7.01 $ 3.13 389,000 $ 8.16 $ 3.89 Stock options exercised (65,833 ) $ 7.91 $ 3.87 — $ — $ — Stock options forfeited (133,835 ) $ 9.44 $ 5.15 (500 ) $ 15.74 $ 9.60 Stock options expired (108,332 ) $ 13.28 $ 7.58 (6,666 ) $ 17.43 $ 10.67 Outstanding at end of period 513,970 $ 10.94 $ 5.89 696,137 $ 11.51 $ 6.35 Stock options exercisable at end of period 360,132 $ 12.41 $ 6.90 427,953 $ 12.67 $ 7.16 Stock options expected to vest at end of period 153,838 $ 7.49 $ 3.52 268,184 $ 9.66 $ 5.06 At September 30, 2018, intrinsic value associated with stock options exercisable and expected to vest was approximately $243 and $355, respectively. The weighted average remaining contractual term of stock options exercisable and expected to vest at September 30, 2018, was approximately 4.9 years and 5.1 years, respectively. Stock options with an aggregate intrinsic value of approximately $574 were exercised by employees during the three months ended September 30, 2018, resulting in proceeds to the Company from the exercise of stock options of approximately $521. The Company received no income tax benefit related to these exercises. There were no other stock option exercises during 2018 or 2017. The activity for restricted stock was as follows: Nine Months Ended September 30, 2018 2017 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 52,502 $ 11.07 94,171 $ 14.29 Restricted stock granted 57,000 $ 7.39 60,000 $ 9.01 Restricted stock vested (42,501 ) $ 10.51 (74,999 ) $ 12.40 Restricted stock forfeited — $ — (11,667 ) $ 14.28 Outstanding at end of period 67,001 $ 8.30 67,505 $ 11.69 Restricted stock expected to vest at end of period 67,001 $ 8.30 67,505 $ 11.69 Restricted stock vested during the nine months ended September 30, 2018 and 2017, had a fair value of approximately $326 and $670, respectively.

Fair Value Measurements

Fair Value Measurements	9 Months Ended
	Sep. 30, 2018
Fair Value Disclosures [Abstract]
Fair Value Measurements	Note 14. 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. During the three months ended March 31, 2017, the Company entered into two separate foreign exchange forward contracts with a German bank in an effort to hedge the variability of certain foreign exchange risks between the euro (the functional currency of the Company’s ExOne GmbH subsidiary) and the British pound sterling (the currency basis for cash flows resulting from a commercial sales arrangement with a customer). The first of the two foreign exchange forward contracts was both entered into and settled (in connection with cash received from the customer) during the three months ended March 31, 2017, resulting in a realized gain on settlement of approximately $16 (€15). The second of the two foreign exchange forward contracts was settled on August 31, 2017, resulting in a realized gain on settlement of approximately $14 (€12). Neither of the contracts was designated as a hedging instrument and accordingly, realized and unrealized gains (losses) have been recorded to other (income) expense – net in the accompanying condensed statement of consolidated operations and comprehensive loss. The Company classified both contracts as Level 2 fair value measurements. There were no such contracts entered into by the Company during the nine months ended September 30, 2018. There were no such contracts outstanding at either September 30, 2018 or December 31, 2017. The carrying values and fair values of other financial instruments (assets and liabilities) not required to be recorded at fair value were as follows: September 30, December 31, 2018 2017 Carrying Value Fair Value Carrying Value Fair Value Cash and cash equivalents $ 10,705 $ 10,705 $ 21,848 $ 21,848 Restricted cash $ 1,312 $ 1,312 $ 330 $ 330 Debt issuance costs (a) $ 217 $ — $ — $ — Current portion of long-term debt (b) $ 142 $ 147 $ 137 $ 142 Current portion of capital leases $ 14 $ 14 $ 15 $ 15 Long-term debt ̶ (b) $ 1,401 $ 1,422 $ 1,508 $ 1,533 Capital leases ̶ $ 38 $ 38 $ 36 $ 36 (a) Represents debt issuance costs associated with the Company’s related party revolving credit facility (Note 11) of which (b) Carrying values at September 30, 2018 and December 31, 2017 are net of unamortized debt issuance costs of approximately $26 and $30, respectively. The carrying amounts of cash and cash equivalents, restricted cash, current portion of long-term debt and current portion of capital leases approximate fair value due to their short-term maturities. The fair value of long-term debt – net of current portion and capital leases – net of current portion have 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, current portion of capital leases, long-term debt – net of current portion and capital leases – net of current portion were classified as Level 2

Concentration of Credit Risk

Concentration of Credit Risk	9 Months Ended
	Sep. 30, 2018
Risks And Uncertainties [Abstract]
Concentration of Credit Risk	Note 15. Concentration of Credit Risk During the three months and nine months ended September 30, 2018 and 2017, 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 September 30, 2018 and 2017, the Company’s five most significant customers represented approximately 34.6% and 46.0% of total revenue, respectively. For the nine months ended September 30, 2018 and 2017, the Company’s five most significant customers represented approximately 17.9% and 22.2% of total revenue, respectively. At September 30, 2018 and December 31, 2017, accounts receivable from the Company’s five most significant customers were approximately $1,267 and $4,199, respectively.

Related Party Transactions

Related Party Transactions	9 Months Ended
	Sep. 30, 2018
Related Party Transactions [Abstract]
Related Party Transactions	Note 16. Related Party Transactions Revenues Sales of products and/or services to related parties for the three months and nine months ended September 30, 2017 were approximately $8 and $25, respectively. None of the transactions met a threshold requiring review and approval by the Audit Committee of the Board. There were no sales of products and/or services to related parties during the nine months ended September 30, 2018. There were no amounts due from related parties at September 30, 2018 or December 31, 2017. Expenses Purchases of products and/or services from related parties during the three months ended September 30, 2018 and 2017, were approximately $4 for both periods. Purchases of products and/or services from related parties during the nine months ended September 30, 2018 and 2017, were approximately $16 and $12, respectively. Purchases of products and/or services by the Company during each of the respective periods included website design services and leased office space from related parties under common control by S. Kent Rockwell, who is the Chairman and Chief Executive Officer of the Company and prior to June 20, 2018, was the Executive Chairman of the Company. None of the transactions met a threshold requiring review and approval by the Audit Committee of the Board. Amounts due to related parties at September 30, 2018 and December 31, 2017, were approximately $2 and $1, respectively. Amounts due to related parties for both periods were reflected in accounts payable in the accompanying condensed consolidated balance sheet. The Company also receives the benefit of the corporate use of an airplane from a related party under common control by the Chairman and Chief Executive Officer of the Company for no consideration. The Company estimates the fair market value of the benefits received during the three months ended September 30, 2018 was approximately $5. There were no such benefits received during any other period in 2018 or 2017. Other Refer to Note 11 for further discussion relating to a revolving credit facility with a related party entered into in March 2018.

Subsequent Events

Subsequent Events	9 Months Ended
	Sep. 30, 2018
Subsequent Events [Abstract]
Subsequent Events	Note 17. 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)	9 Months Ended
	Sep. 30, 2018
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); ExOne Italy S.r.l (Italy); and through December 2017, ExOne Sweden AB (Sweden). 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. 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, 2017 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, 2017, 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.
Recently Adopted and Issued Accounting Guidance	Recently Adopted Accounting Guidance On January 1, 2018, the Company adopted ASU 2017-09, “Compensation – Stock Compensation: Scope of Modification Accounting.” This ASU requires registrants to apply modification accounting unless three specific criteria are met. The three criteria are: the fair value of the award is the same before and after the modification, the vesting conditions are the same before and after the modification and the classification as a debt or equity award is the same before and after the modification. Management has determined that the adoption of this ASU did not have an impact on the consolidated financial statements of the Company. On January 1, 2017, the Company adopted FASB ASU 2016-16, “Income Taxes: Intra-Entity Transfers of Assets Other Than Inventory.” This ASU modifies existing guidance and is intended to reduce diversity in practice with respect to the accounting for the income tax consequences of intra-entity transfers of assets. The ASU indicates that the former exception to income tax accounting that requires companies to defer the income tax effects of certain intercompany transactions would apply only to intercompany inventory transactions. That is, the exception no longer applies to intercompany sales and transfers of other assets ( e.g. e.g. 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 February 2016, the FASB issued ASU 2016-02, “Leases.” As a result of this ASU, lessees will be required to recognize the following for all leases (with the exception of short-term leases) 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. As a result of this ASU, lessor accounting is largely unchanged and lessees will no longer be provided with a source of off-balance sheet financing. This ASU becomes effective for the Company on January 1, 2019. Early adoption is permitted. Lessees (for capital and operating leases) and lessors (for sales-type, direct financing, and operating leases) must apply a modified retrospective transition approach for leases existing at, or entered into after, the beginning of the earliest comparative period presented in the consolidated financial statements. The modified retrospective approach would not require any transition accounting for leases that expired before the earliest comparative period presented. Lessees and lessors may not apply a full retrospective transition approach. Management is currently evaluating the potential impact of this ASU on the consolidated financial statements of the Company. In May 2014, the FASB issued 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 contract(s) with a customer, identify the performance obligations in the contract(s), determine the transaction price, allocate the transaction price to the performance obligations in the contract(s), and recognize revenue when, or as, the entity satisfies a performance obligation. In August 2015, the FASB issued ASU 2015-14, “Revenue from Contracts with Customers: Deferral of the Effective Date,” which deferred the effective date of this guidance for the Company until January 1, 2019. The Company plans to utilize the modified retrospective method in connection with its future adoption of this ASU, as amended. Management is currently evaluating the potential impact of these collective changes on the consolidated financial statements of the Company. This evaluation includes the use of a third party consultant in assessing each of the Company’s revenue streams and determining the potential impact the new guidance may have on its accounting and reporting. Other than the periodic disclosures introduced by this ASU, as amended, the Company does not expect a significant impact 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)	9 Months Ended
	Sep. 30, 2018
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: Three Months Ended Nine Months Ended September 30, September 30, Foreign currency translation adjustments 2018 2017 2018 2017 Balance at beginning of period $ (10,322 ) $ (11,216 ) $ (9,484 ) $ (14,735 ) Other comprehensive (loss) income (429 ) 1,194 (1,267 ) 4,713 Balance at end of period $ (10,751 ) $ (10,022 ) $ (10,751 ) $ (10,022 )

Loss Per Share (Tables)

Loss Per Share (Tables)	9 Months Ended
	Sep. 30, 2018
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: Three Months Ended Nine Months Ended September 30, September 30, 2018 2017 2018 2017 Net loss $ (323 ) $ (4,863 ) $ (14,745 ) $ (18,057 ) Weighted average shares outstanding (basic and diluted) 16,182,818 16,069,453 16,157,143 16,048,257 Net loss per common share: Basic $ (0.02 ) $ (0.30 ) $ (0.91 ) $ (1.13 ) Diluted $ (0.02 ) $ (0.30 ) $ (0.91 ) $ (1.13 )

Cash, Cash Equivalents, and R_2

Cash, Cash Equivalents, and Restricted Cash (Tables)	9 Months Ended
	Sep. 30, 2018
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: September 30, December 31, 2018 2017 Cash and cash equivalents $ 10,705 $ 21,848 Restricted cash 1,312 330 Cash, cash equivalents, and restricted cash $ 12,017 $ 22,178

Inventories (Tables)

Inventories (Tables)	9 Months Ended
	Sep. 30, 2018
Inventory Disclosure [Abstract]
Schedule of Inventories	Inventories consist of the following: September 30, December 31, 2018 2017 Raw materials and components $ 8,632 $ 7,171 Work in process 5,402 4,630 Finished goods 6,685 3,629 $ 20,719 $ 15,430

Product Warranty Reserves (Tabl

Product Warranty Reserves (Tables)	9 Months Ended
	Sep. 30, 2018
Product Warranties Disclosures [Abstract]
Summary of Changes in Product Warranty Reserves	The following table summarizes changes in product warranty reserves (such amounts were reflected in accrued expenses and other current liabilities in the accompanying condensed consolidated balance sheet for each respective period): Three Months Ended Nine Months Ended September 30, September 30, 2018 2017 2018 2017 Balance at beginning of period $ 909 $ 1,075 $ 1,300 $ 1,115 Provisions for new issuances 445 243 831 763 Payments (236 ) (174 ) (564 ) (427 ) Reserve adjustments (103 ) (100 ) (542 ) (466 ) Foreign currency translation adjustments (11 ) 14 (21 ) 73 Balance at end of period $ 1,004 $ 1,058 $ 1,004 $ 1,058

Equity-Based Compensation (Tabl

Equity-Based Compensation (Tables)	9 Months Ended
	Sep. 30, 2018
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: Three Months Ended Nine Months Ended September 30, September 30, 2018 2017 2018 2017 Equity-based compensation expense recognized: Stock options $ 103 $ 768 $ 131 $ 1,244 Restricted stock 108 440 314 799 Other (a) 71 — 211 — Total equity-based compensation expense before income taxes 282 1,208 656 2,043 Benefit for income taxes (b) — — — — Total equity-based compensation expense net of income taxes $ 282 $ 1,208 $ 656 $ 2,043 (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	During the nine months ended September 30, 2018, 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: August 13, 2018 March 16, 2018 Weighted average fair value per stock option $3.01 $3.77 Volatility 63.67% 62.58% Average risk-free interest rate 2.66% 2.45% Dividend yield 0.00% 0.00% Expected term (years) 3.1 3.3 During the nine months ended September 30, 2017, 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: August 14, 2017 February 10, 2017 Weighted average fair value per stock option $3.28 - $4.38 $5.46 - $5.75 Volatility 61.68% - 67.92% 62.89% - 63.75% Average risk-free interest rate 1.40% - 1.82% 1.89% - 1.94% Dividend yield 0.00% 0.00% Expected term (years) 2.5 - 5.5 5.0 - 5.5
Summary of Activity for Stock Options	The activity for stock options was as follows: Nine Months Ended September 30, 2018 2017 Number Options Weighted Weighted Average Grant Date Fair Value Number Options Weighted Weighted Average Grant Date Fair Value Outstanding at beginning of period 674,470 $ 11.58 $ 6.41 314,303 $ 15.62 $ 9.38 Stock options granted 147,500 $ 7.01 $ 3.13 389,000 $ 8.16 $ 3.89 Stock options exercised (65,833 ) $ 7.91 $ 3.87 — $ — $ — Stock options forfeited (133,835 ) $ 9.44 $ 5.15 (500 ) $ 15.74 $ 9.60 Stock options expired (108,332 ) $ 13.28 $ 7.58 (6,666 ) $ 17.43 $ 10.67 Outstanding at end of period 513,970 $ 10.94 $ 5.89 696,137 $ 11.51 $ 6.35 Stock options exercisable at end of period 360,132 $ 12.41 $ 6.90 427,953 $ 12.67 $ 7.16 Stock options expected to vest at end of period 153,838 $ 7.49 $ 3.52 268,184 $ 9.66 $ 5.06
Summary of Activity for Restricted Stock Awards	The activity for restricted stock was as follows: Nine Months Ended September 30, 2018 2017 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 52,502 $ 11.07 94,171 $ 14.29 Restricted stock granted 57,000 $ 7.39 60,000 $ 9.01 Restricted stock vested (42,501 ) $ 10.51 (74,999 ) $ 12.40 Restricted stock forfeited — $ — (11,667 ) $ 14.28 Outstanding at end of period 67,001 $ 8.30 67,505 $ 11.69 Restricted stock expected to vest at end of period 67,001 $ 8.30 67,505 $ 11.69

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	9 Months Ended
	Sep. 30, 2018
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: September 30, December 31, 2018 2017 Carrying Value Fair Value Carrying Value Fair Value Cash and cash equivalents $ 10,705 $ 10,705 $ 21,848 $ 21,848 Restricted cash $ 1,312 $ 1,312 $ 330 $ 330 Debt issuance costs (a) $ 217 $ — $ — $ — Current portion of long-term debt (b) $ 142 $ 147 $ 137 $ 142 Current portion of capital leases $ 14 $ 14 $ 15 $ 15 Long-term debt ̶ (b) $ 1,401 $ 1,422 $ 1,508 $ 1,533 Capital leases ̶ $ 38 $ 38 $ 36 $ 36 (a) Represents debt issuance costs associated with the Company’s related party revolving credit facility (Note 11) of which (b) Carrying values at September 30, 2018 and December 31, 2017 are net of unamortized debt issuance costs of approximately $26 and $30, respectively.

Basis of Presentation - Additio

Basis of Presentation - Additional Information (Detail) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Jan. 01, 2017
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
State of incorporation	Delaware
Date of incorporation	Jan. 1, 2013
ASU 2016-16 [Member] | Retrospective Adjustment [Member] | Accumulated Deficit [Member]
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Cumulative-effect adjustment to accumulated deficit		$ (408)
Subsidiary Guarantor [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	Sep. 30, 2018	Mar. 31, 2016	Sep. 30, 2018	Sep. 30, 2018	Dec. 31, 2017
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Net income (loss)			$ (323,000)			$ (14,745,000)
Cash and cash equivalents			10,705,000		$ 10,705,000	10,705,000	$ 21,848,000
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
FBR Capital Markets & Co. and MLV & Co. LLC [Member] | At Market Issuance Offering [Member]
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Unrestricted net proceeds of secondary public offering				$ 595,000
FBR Capital Markets & Co. and MLV & Co. LLC [Member] | At Market Issuance Offering [Member] | Maximum [Member]
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Sale of common stock, value				$ 50,000,000
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		$ 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		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Statement Of Income And Comprehensive Income [Abstract]
Balance at beginning of period	$ (10,322)	$ (11,216)	$ (9,484)	$ (14,735)
Other comprehensive (loss) income	(429)	1,194	(1,267)	4,713
Balance at end of period	$ (10,751)	$ (10,022)	$ (10,751)	$ (10,022)

Accumulated Other Comprehensi_4

Accumulated Other Comprehensive Loss - Additional Information (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
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		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Stock Option [Member]
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Potential shares of anti-dilutive common stock	513,970	696,137	513,970	696,137
Restricted Stock [Member]
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Potential shares of anti-dilutive common stock	67,001	67,505	67,001	67,505

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						9 Months Ended
	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Sep. 30, 2018	Sep. 30, 2017
Earnings Per Share [Abstract]
Net loss	$ (323)	$ (8,037)	$ (6,385)	$ (4,863)	$ (6,403)	$ (6,791)	$ (14,745)	$ (18,057)
Weighted average shares outstanding (basic and diluted)	16,182,818			16,069,453			16,157,143	16,048,257
Net loss per common share:
Basic	$ (0.02)			$ (0.30)			$ (0.91)	$ (1.13)
Diluted	$ (0.02)			$ (0.30)			$ (0.91)	$ (1.13)

Restructuring - Additional Info

Restructuring - Additional Information (Detail) - USD ($)	May 09, 2017	Apr. 21, 2017	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Jun. 30, 2017	Mar. 31, 2017	Sep. 30, 2018	Sep. 30, 2017
Restructuring Cost And Reserve [Line Items]
Gain (loss) on disposal of assets									$ 33,000	$ 322,000
Proceeds from sale of property and equipment									77,000	$ 3,702,000
Houston, Texas 3D Printing Operations [Member]
Restructuring Cost And Reserve [Line Items]
Involuntary employee terminations charges			$ 28,000
Asset impairment charges			1,000
Additional charges expected to be incurred			0						0
Reclassifications of assets held for sale from property and equipment to prepaid and other current assets			822,000						$ 822,000
Houston, Texas 3D Printing Operations [Member] | Cost of Sales [Member]
Restructuring Cost And Reserve [Line Items]
Involuntary employee terminations charges			15,000
Houston, Texas 3D Printing Operations [Member] | Selling, General and Administrative Expenses [Member]
Restructuring Cost And Reserve [Line Items]
Involuntary employee terminations charges			$ 13,000
Desenzano Del Garada, Italy 3D Printing Operations [Member]
Restructuring Cost And Reserve [Line Items]
Involuntary employee terminations charges						$ 72,000
Asset impairment charges				$ 13,000	$ 228,000
Additional charges expected to be incurred				0
Total restructuring charges					245,000
Other exit costs					$ 17,000
Gain (loss) on disposal of assets				$ 51,000
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
North Las Vegas, Nevada 3D Printing Operations [Member]
Restructuring Cost And Reserve [Line Items]
Involuntary employee terminations charges							$ 32,000	$ 110,000
Asset impairment charges								867,000
Additional charges expected to be incurred						$ 0
Total restructuring charges								984,000
Other exit costs								7,000
North Las Vegas, Nevada 3D Printing Operations [Member] | Cost of Sales [Member]
Restructuring Cost And Reserve [Line Items]
Asset impairment charges								598,000
North Las Vegas, Nevada 3D Printing Operations [Member] | Selling, General and Administrative Expenses [Member]
Restructuring Cost And Reserve [Line Items]
Asset impairment charges								269,000
Chesterfield Michigan Non Core Specialty Machining Operations [Member]
Restructuring Cost And Reserve [Line Items]
Gain (loss) on disposal of assets							(42,000)
Proceeds from sale of inventories		$ 79,000
Proceeds from sale of property and equipment		2,475,000
Proceeds from sale of other contractual rights		269,000
Gross proceeds from the sale assets		2,050,000
Impairment loss								859,000
Chesterfield Michigan Non Core Specialty Machining Operations [Member] | Service [Member]
Restructuring Cost And Reserve [Line Items]
Direct cost of assets		$ 128,000
Chesterfield Michigan Non Core Specialty Machining Operations [Member] | Property Plant and Equipment [Member]
Restructuring Cost And Reserve [Line Items]
Impairment loss								590,000
Chesterfield Michigan Non Core Specialty Machining Operations [Member] | Intangible Assets [Member]
Restructuring Cost And Reserve [Line Items]
Impairment loss								269,000
North Las Vegas, Nevada [Member]
Restructuring Cost And Reserve [Line Items]
Gain (loss) on disposal of assets	$ 137,000
Proceeds from sale of property and equipment	$ 1,950,000
North Las Vegas, Nevada [Member] | Service [Member]
Restructuring Cost And Reserve [Line Items]
Direct cost of assets							$ 347,000
North Las Vegas, Nevada [Member] | Property Plant and Equipment [Member]
Restructuring Cost And Reserve [Line Items]
Gain (loss) on disposal of assets								$ (8,000)

Impairment - Additional Informa

Impairment - Additional Information (Detail)	3 Months Ended
	Sep. 30, 2018USD ($)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	Sep. 30, 2018	Dec. 31, 2017
Cash And Cash Equivalents [Abstract]
Cash and cash equivalents	$ 10,705	$ 21,848
Restricted cash	1,312	330
Cash, cash equivalents, and restricted cash	$ 12,017	$ 22,178

Cash, Cash Equivalents, and R_4

Cash, Cash Equivalents, and Restricted Cash - Additional Information (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Cash Cash Equivalents And Restricted Cash [Line Items]
Restricted cash associated with cash collateral	$ 1,312	$ 330
German Bank [Member]
Cash Cash Equivalents And Restricted Cash [Line Items]
Restricted cash associated with cash collateral	812
United States Bank [Member]
Cash Cash Equivalents And Restricted Cash [Line Items]
Restricted cash associated with cash collateral	$ 500	$ 330

Inventories - Schedule of Inven

Inventories - Schedule of Inventories (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Inventory Disclosure [Abstract]
Raw materials and components	$ 8,632	$ 7,171
Work in process	5,402	4,630
Finished goods	6,685	3,629
Inventories	$ 20,719	$ 15,430

Inventories - Additional Inform

Inventories - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended				9 Months Ended
	Sep. 30, 2018	Jun. 30, 2018	Sep. 30, 2017	Jun. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Inventory [Line Items]
Allowance for slow-moving and obsolete inventories	$ 4,079				$ 4,079		$ 3,437
Inventory (credit) charge	$ 59		$ (11)		$ 29	$ 116
Auburn, Washington 3D Printing Operations [Member]
Inventory [Line Items]
Inventory (credit) charge				$ 1,460
Industrial Microwave [Member]
Inventory [Line Items]
Inventory (credit) charge		$ 561

Product Warranty Reserves - Add

Product Warranty Reserves - Additional Information (Detail)	9 Months Ended
	Sep. 30, 2018
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		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Guarantees [Abstract]
Balance at beginning of period	$ 909	$ 1,075	$ 1,300	$ 1,115
Provisions for new issuances	445	243	831	763
Payments	(236)	(174)	(564)	(427)
Reserve adjustments	(103)	(100)	(542)	(466)
Foreign currency translation adjustments	(11)	14	(21)	73
Balance at end of period	$ 1,004	$ 1,058	$ 1,004	$ 1,058

Contingencies and Commitments -

Contingencies and Commitments - Additional Information (Detail) € in Thousands	Jul. 01, 2017USD ($)	Sep. 30, 2017USD ($)	Sep. 30, 2018USD ($)	Sep. 30, 2018EUR (€)	Dec. 31, 2017USD ($)	Dec. 31, 2017EUR (€)
Germany [Member] | German Bank [Member]
Line Of Credit Facility [Line Items]
Credit facility, maximum borrowing capacity			$ 1,500,000	€ 1,300
Credit facility, minimum increments			100,000	100
Credit facility, commitment fee			$ 0
Germany [Member] | German Bank [Member] | Minimum [Member]
Line Of Credit Facility [Line Items]
Debt Instrument, term			30 days
Germany [Member] | German Bank [Member] | Commercial Transactions Requiring Security [Member]
Line Of Credit Facility [Line Items]
Credit facility, interest rate			1.75%
Credit facility, outstanding amount					$ 1,128,000	€ 941
Germany [Member] | German Bank [Member] | 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			$ 93,000	80
Expiration date, description			June 2,022
Germany [Member] | German Bank [Member] | 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
Germany [Member] | German Bank [Member] | Short-Term Loans [Member]
Line Of Credit Facility [Line Items]
Outstanding borrowings in form of overdraft credit or short-term loans			0		$ 0
Germany [Member] | German Bank [Member] | Commercial Transactions Requiring Security Expiring From July Twenty Eighteen Through July Twenty Nineteen [Member]
Line Of Credit Facility [Line Items]
Credit facility, outstanding amount			$ 812,000	€ 699
Expiration date, description			October 2018 through November 2019
Kocel [Member]
Line Of Credit Facility [Line Items]
Settlement Agreement date			July 1, 2017
Settlement Agreement, counterparty's name			Kocel Foundry Limited (also known as Kocel CSR Casting Company, Limited) and Kocel Group (Hong Kong) Limited (collectively, “Kocel”)
Cash payment relates to Sales Agreement	$ 811,000
Revenue associated with Sales Agreement net of the cash payment		$ 2,762,000

Related Party Revolving Credi_2

Related Party Revolving Credit Facility - Additional Information (Detail) - USD ($)	Mar. 12, 2018	Mar. 31, 2018	Sep. 30, 2018	Sep. 30, 2018	Sep. 30, 2017	Jun. 30, 2018	Dec. 31, 2017
Related Party Transaction [Line Items]
Amortization of debt issuance costs				$ 52,000	$ 4,000
Accounts payable			$ 3,534,000	3,534,000			$ 4,291,000
Revolving Credit Facility [Member] | Prepaid Expenses and Other Current Assets [Member]
Related Party Transaction [Line Items]
Debt issuance costs, net			88,000	88,000
Revolving Credit Facility [Member] | Other Noncurrent Assets [Member]
Related Party Transaction [Line Items]
Debt issuance costs, net			129,000	129,000
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	$ 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	6.70%		7.30%	7.30%
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
Debt issuance costs			$ 265,000	$ 265,000
Interest expense relating to the Credit Agreement			51,000	110,000
Amortization of debt issuance costs			23,000	48,000
Debt issuance costs, net			217,000	217,000
Interest expense relating to the commitment fee			28,000	62,000
Accounts payable			9,000	9,000
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			$ 129,000	$ 129,000
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 ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Schedule Of Income Taxes [Line Items]
Provision (benefit) for income taxes	$ 17	$ 14	$ 52	$ 23
Effective tax rate	5.60%	0.30%	0.40%	0.10%
United States statutory rate			21.00%		34.00%
Liability for uncertain tax positions	$ 831		$ 831		$ 858
Subsidiaries [Member] | Germany [Member]
Schedule Of Income Taxes [Line Items]
Liability for uncertain tax positions	357		357		323
Subsidiaries [Member] | Japan [Member]
Schedule Of Income Taxes [Line Items]
Liability for uncertain tax positions	$ 218		$ 218		$ 594

Equity-Based Compensation - Add

Equity-Based Compensation - Additional Information (Detail) - USD ($)	Jan. 24, 2013	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense		$ 282,000	$ 1,208,000	$ 656,000	$ 2,043,000
Weighted-average remaining vesting period				1 year 6 months
Proceeds from exercise of employee stock options				$ 521,000
Incentive stock options exercised				65,833	0
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense		103,000	768,000	$ 131,000	$ 1,244,000
Total future compensation expense		497,000		497,000
Intrinsic value, stock options expected to vest		355,000		355,000
Intrinsic value, stock options exercisable		243,000		$ 243,000
Weighted average remaining contractual term of stock options exercisable				4 years 10 months 24 days
Weighted average remaining contractual term of stock options expected to vest				5 years 1 month 6 days
Intrinsic value of stock options exercised				$ 574,000
Proceeds from exercise of employee stock options				521,000
Income tax benefit				0
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense		108,000	$ 440,000	314,000	799,000
Total future compensation expense		$ 391,000		391,000
Fair value of restricted shares vested				$ 326,000	$ 670,000
Other Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Incentive stock options exercised				0		0
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		66,000
2013 Equity Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock reserved for issuance	500,000
2013 Equity Incentive Plan [Member] | Common Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of outstanding shares of common stock	3.00%
2013 Equity Incentive Plan [Member] | Common Stock [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Shares authorized	1,992,241
2018 Annual Incentive Program [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Target amount payable under Program		$ 1,423,000		$ 1,423,000
Compensation expense		159,000		464,000
Compensation expense, expected to be settled in equity		199,000		199,000
2018 Annual Incentive Program [Member] | Cost of Sales [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense		30,000		75,000
2018 Annual Incentive Program [Member] | Research and Development [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense		19,000		109,000
2018 Annual Incentive Program [Member] | Selling, General and Administrative Expenses [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense		$ 110,000		$ 280,000

Equity-Based Compensation - Sum

Equity-Based Compensation - Summary of Equity-Based Compensation Expense (Detail) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Equity-based compensation expense recognized:
Total equity-based compensation expense before income taxes		$ 282	$ 1,208	$ 656	$ 2,043
Benefit for income taxes	[1]	0	0	0	0
Total equity-based compensation expense net of income taxes		282	1,208	656	2,043
Stock Options [Member]
Equity-based compensation expense recognized:
Total equity-based compensation expense before income taxes		103	768	131	1,244
Restricted Stock [Member]
Equity-based compensation expense recognized:
Total equity-based compensation expense before income taxes		108	440	314	799
Other [Member]
Equity-based compensation expense recognized:
Total equity-based compensation expense before income taxes	[2]	$ 71	$ 0	$ 211	$ 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
[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		9 Months Ended
		Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
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	Aug. 13, 2018	Mar. 16, 2018	Aug. 14, 2017	Feb. 10, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average fair value per stock option	$ 3.01	$ 3.77
Volatility	63.67%	62.58%
Average risk-free interest rate	2.66%	2.45%
Dividend yield	0.00%	0.00%	0.00%	0.00%
Expected term (years)	3 years 1 month 6 days	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			$ 3.28	$ 5.46
Volatility			61.68%	62.89%
Average risk-free interest rate			1.40%	1.89%
Expected term (years)			2 years 6 months	5 years
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average fair value per stock option			$ 4.38	$ 5.75
Volatility			67.92%	63.75%
Average risk-free interest rate			1.82%	1.94%
Expected term (years)			5 years 6 months	5 years 6 months

Equity-Based Compensation - S_3

Equity-Based Compensation - Summary of Activity for Stock Options (Detail) - $ / shares	9 Months Ended		12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Stock options outstanding, Beginning balance	674,470	314,303	314,303
Stock options granted	147,500	389,000
Stock options exercised	(65,833)	0
Stock options forfeited	(133,835)	(500)
Stock options expired	(108,332)	(6,666)
Stock options outstanding, Ending balance	513,970	696,137	674,470
Stock options exercisable at end of period	360,132	427,953
Stock options expected to vest at end of period	153,838	268,184
Weighted average exercise price, Beginning balance	$ 11.58	$ 15.62	$ 15.62
Weighted average exercise price, Stock options granted	7.01	8.16
Weighted average exercise price, Stock options exercised	7.91	0
Weighted average exercise price, Stock options forfeited	9.44	15.74
Weighted average exercise price, Stock options expired	13.28	17.43
Weighted average exercise price, Ending balance	10.94	11.51	11.58
Weighted average exercise price, Stock options exercisable	12.41	12.67
Weighted average exercise price, Stock options expected to vest, net of forfeitures	7.49	9.66
Weighted average grant date fair value, Beginning balance	6.41	9.38	9.38
Weighted average grant date fair value, Stock options granted	3.13	3.89
Weighted average grant date fair value, Stock options exercised	3.87	0
Weighted average grant date fair value, Stock options forfeited	5.15	9.60
Weighted average grant date fair value, Stock options expired	7.58	10.67
Weighted average grant date fair value, Ending balance	5.89	6.35	$ 6.41
Weighted average grant date fair value, Stock options exercisable	6.90	7.16
Weighted average grant date fair value, Stock options expected to vest, net of forfeitures	$ 3.52	$ 5.06

Equity-Based Compensation - S_4

Equity-Based Compensation - Summary of Activity for Restricted Stock Awards (Detail) - Restricted Stock [Member] - $ / shares	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Restricted Shares, outstanding, Beginning Balance	52,502	94,171
Number of Restricted Shares, granted	57,000	60,000
Number of Restricted Shares, vested	(42,501)	(74,999)
Number of Restricted Shares, forfeited	0	(11,667)
Number of Restricted Shares, outstanding, Ending Balance	67,001	67,505
Number of Restricted Shares, expected to vest	67,001	67,505
Weighted Average Grant Date Fair Value, Beginning Balance	$ 11.07	$ 14.29
Weighted Average Grant Date Fair Value, granted	7.39	9.01
Weighted Average Grant Date Fair Value, vested	10.51	12.40
Weighted Average Grant Date Fair Value, forfeited	0	14.28
Weighted Average Grant Date Fair Value, Ending Balance	8.30	11.69
Weighted Average Grant Date Fair Value, expected to vest	$ 8.30	$ 11.69

Fair Value Measurements - Addit

Fair Value Measurements - Additional Information (Detail) - Level 2 Fair Value Measurements [Member] - German Bank [Member] € in Thousands, $ in Thousands	1 Months Ended		3 Months Ended
	Aug. 31, 2017USD ($)	Aug. 31, 2017EUR (€)	Mar. 31, 2017USD ($)Contract	Mar. 31, 2017EUR (€)Contract	Sep. 30, 2018Contract	Dec. 31, 2017Contract
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Number of foreign exchange forward contracts			2	2	0
Gain realized on settlement of foreign exchange forward contracts	$ 14	€ 12	$ 16	€ 15
Number of foreign exchange forward contracts outstanding					0	0

Fair Value Measurements - Carry

Fair Value Measurements - Carrying Values and Fair Values of Other Financial Instruments (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Carrying Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	$ 10,705	$ 21,848
Restricted cash	1,312	330
Debt issuance costs	217
Current portion of long-term debt	142	137
Current portion of capital leases	14	15
Long-term debt ̶ net of current portion	1,401	1,508
Capital leases ̶ net of current portion	38	36
Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	10,705	21,848
Restricted cash	1,312	330
Current portion of long-term debt	147	142
Current portion of capital leases	14	15
Long-term debt ̶ net of current portion	1,422	1,533
Capital leases ̶ net of current portion	$ 38	$ 36

Fair Value Measurements - Car_2

Fair Value Measurements - Carrying Values and Fair Values of Other Financial Instruments (Parenthetical) (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Unamortized debt issuance costs	$ 26	$ 30
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
Revolving Credit Facility [Member] | Other Noncurrent Assets [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt issuance costs	$ 129

Concentration of Credit Risk -

Concentration of Credit Risk - Additional Information (Detail) - Five Most Significant Customers [Member] - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Revenue, Major Customer [Line Items]
Accounts receivable from significant customers	$ 1,267		$ 1,267		$ 4,199
Customer Concentration Risk [Member] | Sales Revenue, Net [Member]
Revenue, Major Customer [Line Items]
Revenue concentration, by most significant customers	34.60%	46.00%	17.90%	22.20%

Related Party Transactions - Ad

Related Party Transactions - Additional Information (Detail) - USD ($)	3 Months Ended		6 Months Ended	9 Months Ended		12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Jun. 30, 2018	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Related Party Transaction [Line Items]
Revenue - related parties		$ 8,000		$ 0	$ 25,000
Amounts due from related parties reflected in accounts receivable	$ 0			0		$ 0
Accounts Payable [Member]
Related Party Transaction [Line Items]
Amounts due to related party	2,000			2,000		1,000
Former Chairman and Chief Executive Officer [Member]
Related Party Transaction [Line Items]
Purchases from related parties	4,000	$ 4,000		$ 16,000	$ 12,000
Fair market value of benefits received from related party	$ 5,000		$ 0			$ 0