ExOne (XONE) 10-Q 9 Nov 17 2017 Q3 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2017	Nov. 09, 2017
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2017
Document Fiscal Year Focus	2,017
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 Common Stock, Shares Outstanding		16,158,619

Condensed Statement of Consolid

Condensed Statement of Consolidated Operations and Comprehensive Loss - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Income Statement [Abstract]
Revenue	$ 15,887	$ 12,988	$ 37,555	$ 33,157
Cost of sales	11,790	9,428	29,829	24,215
Gross profit	4,097	3,560	7,726	8,942
Operating expenses
Research and development	2,871	1,898	7,219	5,737
Selling, general and administrative	6,062	5,234	18,338	15,222
Total operating expenses	8,933	7,132	25,557	20,959
Loss from operations	(4,836)	(3,572)	(17,831)	(12,017)
Other expense (income)
Interest expense	24	22	69	276
Other (income) expense ̶ net	(11)	(8)	134	(306)
Total other (income) expense	13	14	203	(30)
Loss before income taxes	(4,849)	(3,586)	(18,034)	(11,987)
Provision for income taxes	14	25	23	43
Net loss	$ (4,863)	$ (3,611)	$ (18,057)	$ (12,030)
Net loss per common share:
Basic	$ (0.30)	$ (0.23)	$ (1.13)	$ (0.76)
Diluted	$ (0.30)	$ (0.23)	$ (1.13)	$ (0.76)
Comprehensive loss:
Net loss	$ (4,863)	$ (3,611)	$ (18,057)	$ (12,030)
Other comprehensive income:
Foreign currency translation adjustments	1,194	489	4,713	2,288
Comprehensive loss	$ (3,669)	$ (3,122)	$ (13,344)	$ (9,742)

Condensed Consolidated Balance

Condensed Consolidated Balance Sheet - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 17,706	$ 27,825
Restricted cash	1,098	330
Accounts receivable ̶ net of allowance of $1,494 (2017) and $1,566 (2016)	6,539	6,447
Inventories ̶ net	16,643	15,838
Prepaid expenses and other current assets	2,293	1,159
Total current assets	44,279	51,599
Property and equipment ̶ net	49,489	51,134
Intangible assets ̶ net	152	668
Other noncurrent assets	781	777
Total assets	94,701	104,178
Current liabilities:
Current portion of long-term debt	135	132
Current portion of capital leases	25	72
Accounts payable	4,311	2,036
Accrued expenses and other current liabilities	5,033	5,124
Deferred revenue and customer prepayments	7,533	7,371
Total current liabilities	17,037	14,735
Long-term debt ̶ net of current portion	1,543	1,644
Capital leases ̶ net of current portion	41	10
Other noncurrent liabilities	9	9
Total liabilities	18,630	16,398
Contingencies and commitments
Stockholders' equity
Common stock, $0.01 par value, 200,000,000 shares authorized, 16,092,114 (2017) and 16,017,115 (2016) shares issued and outstanding	161	160
Additional paid-in capital	173,158	171,116
Accumulated deficit	(87,226)	(68,761)
Accumulated other comprehensive loss	(10,022)	(14,735)
Total stockholders' equity	76,071	87,780
Total liabilities and stockholders' equity	$ 94,701	$ 104,178

Condensed Consolidated Balance4

Condensed Consolidated Balance Sheet (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Statement Of Financial Position [Abstract]
Allowance for accounts receivable	$ 1,494	$ 1,566
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	200,000,000	200,000,000
Common stock, shares issued	16,092,114	16,017,115
Common stock, shares outstanding	16,092,114	16,017,115

Condensed Statement of Consoli5

Condensed Statement of Consolidated Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Operating activities
Net loss	$ (18,057)	$ (12,030)
Adjustments to reconcile net loss to net cash used for operations:
Depreciation and amortization	4,966	4,280
Equity-based compensation	2,043	1,104
Amortization of debt issuance costs	4	209
Deferred income taxes		(29)
Recoveries for bad debts ̶ net	(51)	(256)
Provision (recoveries) for slow-moving, obsolete and lower of cost or market inventories ̶ net	1,872	(356)
(Gain) loss from disposal of property and equipment ̶ net	(322)	163
Changes in assets and liabilities, excluding effects of foreign currency translation adjustments:
Decrease in accounts receivable	288	4,681
(Increase) decrease in inventories	(2,772)	399
(Increase) decrease in prepaid expenses and other assets	(1,438)	795
Increase (decrease) in accounts payable	2,032	(1,296)
Decrease in accrued expenses and other liabilities	(522)	(1,259)
(Decrease) increase in deferred revenue and customer prepayments	(938)	1,687
Net cash used for operating activities	(12,895)	(1,908)
Investing activities
Capital expenditures	(874)	(690)
Proceeds from sale of property and equipment	3,702	52
Net cash provided by (used for) investing activities	2,828	(638)
Financing activities
Net proceeds from issuance of common stock ̶ registered direct offering to a related party		12,447
Net proceeds from issuance of common stock ̶ at the market offerings		595
Payments on long-term debt	(102)	(102)
Payments on capital leases	(64)	(61)
Net cash (used for) provided by financing activities	(166)	12,879
Effect of exchange rate changes on cash, cash equivalents, and restricted cash	882	138
Net change in cash, cash equivalents, and restricted cash	(9,351)	10,471
Cash, cash equivalents, and restricted cash at beginning of period	28,155	19,672
Cash, cash equivalents, and restricted cash at end of period	18,804	30,143
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	2,363	2,666
Transfer of internally developed 3D printing machines from property and equipment to inventories for sale	597	1,276
Property and equipment acquired through financing arrangements	48
Property and equipment included in accounts payable	94	15
Property and equipment included in accrued expenses and other current liabilities	84
Advance deposits on property and equipment	$ 12	$ 203

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, 2015	$ 89,073	$ 144	$ 156,627	$ (54,163)	$ (13,535)
Beginning Balance, Shares at Dec. 31, 2015		14,447,000
Registered direct offering of common stock to a related party, net of issuance costs	12,447	$ 15	12,432
Registered direct offering of common stock to a related party, net of issuance costs, Shares		1,424,000
At the market offerings of common stock, net of issuance costs	595	$ 1	594
At the market offerings of common stock, net of issuance costs, Shares		92,000
Net loss	(12,030)			(12,030)
Other comprehensive income	2,288				2,288
Equity-based compensation	1,104		1,104
Equity-based compensation, Shares		32,000
Ending Balance at Sep. 30, 2016	93,477	$ 160	170,757	(66,193)	(11,247)
Ending Balance, Shares at Sep. 30, 2016		15,995,000
Beginning Balance at Dec. 31, 2016	$ 87,780	$ 160	171,116	(68,761)	(14,735)
Beginning Balance, Shares at Dec. 31, 2016	16,017,115	16,017,000
Cumulative-effect adjustment due to the adoption of Financial Accounting Standards Board Accounting Standards Update 2016-16	$ (408)			(408)
Net loss	(18,057)			(18,057)
Other comprehensive income	4,713				4,713
Equity-based compensation	2,043	$ 1	2,042
Equity-based compensation, Shares		75,000
Ending Balance at Sep. 30, 2017	$ 76,071	$ 161	$ 173,158	$ (87,226)	$ (10,022)
Ending Balance, Shares at Sep. 30, 2017	16,092,114	16,092,000

Basis of Presentation

Basis of Presentation	9 Months Ended
	Sep. 30, 2017
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); ExOne Sweden AB (Sweden); and through September 2016, MWT—Gesellschaft für Industrielle Mikrowellentechnik mbH (Germany). Collectively, the consolidated group is referred to as the “Company”. On September 15, 2016, the Company completed a transaction merging its MWT—Gesellschaft für Industrielle Mikrowellentechnik mbH (Germany) subsidiary with and into its ExOne GmbH (Germany) subsidiary. The purpose of this transaction was to further simplify the Company’s legal structure. There were no significant accounting or tax related impacts associated with the merger of these wholly owned subsidiaries. The Company filed a registration statement on Form S-3 (No. 333-203353) 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, 2016 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, 2016, which includes all disclosures required by GAAP. The preparation of these condensed consolidated financial statements requires the Company to make certain judgments, estimates and assumptions regarding uncertainties that affect the reported amounts of assets, liabilities, revenue and expenses and related disclosure of contingent assets and liabilities. Areas that require significant judgments, estimates and assumptions include accounting for accounts receivable (including the allowance for doubtful accounts); inventories (including the allowance for slow-moving and obsolete inventories); product warranty reserves; contingencies; income taxes (including the valuation allowance on certain deferred tax assets and liabilities for uncertain tax positions); equity-based compensation (including the valuation of certain equity-based compensation awards issued by the Company); and testing for impairment of long-lived assets (including the identification of asset groups by management, estimates of future cash flows of identified asset groups and fair value estimates used in connection with assessing the valuation of identified asset groups). The Company bases its estimates on historical experience and on various other assumptions that are believed to be reasonable, the results of which form the basis for making judgments about the carrying values of assets and liabilities that are not readily apparent from other sources. Actual results may differ from these estimates. Certain amounts relating to restricted cash ($330) and intangible assets – net ($668) in the accompanying condensed consolidated balance sheet at December 31, 2016, have been reclassified from prepaid expenses and other current assets and other noncurrent assets, respectively, to conform to current period presentation. Certain amounts relating to provision (recoveries) for slow-moving, obsolete and lower of cost or market inventories – net ($356) and amortization of debt issuance costs ($5) in the accompanying condensed statement of consolidated cash flows for the nine months ended September 30, 2016, have been reclassified from decrease in inventories and decrease in prepaid expenses and other assets, respectively, to conform to current period presentation. Recently Adopted Accounting Guidance On January 1, 2017, the Company adopted Financial Accounting Standards Board (“FASB”) Accounting Standards Update (“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. On January 1, 2017, the Company adopted FASB ASU 2016-17, “Consolidation: Interests Held through Related Parties That Are under Common Control.” This ASU modifies former guidance with respect to how a decision maker that holds an indirect interest in a variable interest entity (“VIE”) through a common control party determines whether it is the primary beneficiary of the VIE as part of the analysis of whether the VIE would need to be consolidated. Under the ASU, a decision maker needs to consider only its proportionate indirect interest in the VIE held through a common control party. Previous guidance had required the decision maker to treat the common control party’s interest in the VIE as if the decision maker held the interest itself. The Company does not have significant involvement with entities subject to consolidation considerations impacted by VIE model factors addressed by this ASU. Management has determined that the adoption of this ASU did not have an impact on the condensed consolidated financial statements of the Company. On January 1, 2017, the Company adopted FASB ASU 2015-11, “Inventory: Simplifying the Measurement of Inventory.” This ASU requires inventories to be measured at the lower of cost and net realizable value, with net realizable value defined as the estimated selling price in the normal course of business, less reasonably predictable costs of completion, disposal and transportation. Management has determined that the adoption of this ASU did not have an impact on the condensed consolidated financial statements of the Company. Recently Issued Accounting Guidance The Company considers the applicability and impact of all ASUs issued by the FASB. Recently issued ASUs not listed below were assessed and determined to be either not applicable or are currently expected to have no impact on the consolidated financial statements of the Company. In May 2017, the FASB issued 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. This ASU becomes effective for the Company on January 1, 2018, and is to be applied prospectively to new awards granted after adoption. Management is currently evaluating the potential impact of this ASU on the consolidated financial statements of the Company. In August 2016, the FASB issued ASU 2016-15, “Statement of Cash Flows: Classification of Certain Cash Receipts and Cash Payments.” This ASU is intended to reduce diversity in practice in how certain cash receipts and payments are presented and classified in the statement of cash flows. The standard provides guidance in a number of situations including, among others, settlement of zero-coupon bonds, contingent consideration payments made after a business combination, proceeds from the settlement of insurance claims, and distributions received from equity method investees. The ASU also provides guidance for classifying cash receipts and payments that have aspects of more than one class of cash flows. This ASU becomes effective for the Company on January 1, 2019. Early adoption is permitted. Management is currently evaluating the potential impact of this ASU 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, or January 1, 2018, in the event that the Company no longer qualifies as an EGC. Early adoption is permitted, but the Company may adopt the changes no earlier than January 1, 2017 (regardless of EGC status). Management is currently evaluating the potential impact of these collective changes on the consolidated financial statements of the Company.

Liquidity

Liquidity	9 Months Ended
	Sep. 30, 2017
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Liquidity	Note 2. Liquidity On February 6, 2013, the Company commenced an initial public offering of 6,095,000 shares of its common stock at a price to the public of $18.00 per share, of which 5,483,333 shares of common stock were sold by the Company and 611,667 shares of common stock were sold by a selling stockholder (including consideration of the exercise of the underwriters’ over-allotment option). The Company received approximately $90,371 in unrestricted net proceeds in connection with this offering (net of underwriting commissions and offering costs). On September 9, 2013, the Company commenced a secondary public offering of 3,054,400 shares of its common stock at a price to the public of $62.00 per share, of which 1,106,000 shares of common stock were sold by the Company and 1,948,400 shares of common stock were sold by selling stockholders (including consideration of the exercise of the underwriters’ over-allotment option). The Company received approximately $64,948 in unrestricted net proceeds in connection with this offering (net of underwriting commissions and offering costs). On January 8, 2016, the Company announced that it had entered into 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”). On January 11, 2016, the Company announced that it had entered into a subscription agreement with Rockwell Forest Products, Inc. and S. Kent Rockwell for the registered direct offering and sale of 1,423,877 shares of ExOne common stock at a per share price of $9.13 (a $0.50 premium from the closing price on the close of business on January 8, 2016). Both Rockwell Forest Products, Inc. and S. Kent Rockwell were identified as related parties to the Company as S. Kent Rockwell served as Chairman and CEO of the Company and was the controlling shareholder of Rockwell Forest Products, Inc. at the time of the transaction. The terms of this transaction were reviewed and approved by a sub-committee of independent members of the Board of Directors of the Company (which included each of the members of the Audit Committee of the Board of Directors). The sub-committee of independent members of the Board of Directors of the Company were advised on the transaction by an independent financial advisor and independent legal counsel. Concurrent with the approval of this sale of common stock under the terms identified, a separate sub-committee of independent members of the Board of Directors of the Company approved the termination of the Company’s revolving credit facility with RHI Investments, LLC. Following completion of the registered direct offering on January 13, 2016, the Company received gross proceeds of approximately $13,000. Unrestricted net proceeds to the Company from the sale of common stock in the registered direct offering were approximately $12,447 (after deducting offering costs of approximately $553). 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 $4,863 and $18,057 for the quarter and nine months ended September 30, 2017, respectively. As noted above, the Company has received cumulative unrestricted net proceeds from the sale of its common stock of approximately $168,361 to fund its operations. At September 30, 2017, the Company had approximately $17,706 in unrestricted cash and cash equivalents. 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. Further, the Company may 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, 2017
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: Quarter Ended Nine Months Ended September 30, September 30, Foreign currency translation adjustments 2017 2016 2017 2016 Balance at beginning of period $ (11,216 ) $ (11,736 ) $ (14,735 ) $ (13,535 ) Other comprehensive income 1,194 489 4,713 2,288 Balance at end of period $ (10,022 ) $ (11,247 ) $ (10,022 ) $ (11,247 ) 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, 2017
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 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 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 quarters and nine months ended September 30, 2017 and 2016, basic average shares outstanding and diluted average shares outstanding were the same because the effect of potential shares of common stock, including stock options (696,137 – 2017 and 317,637 – 2016) and unvested restricted stock issued (67,505 – 2017 and 112,504 – 2016), was anti-dilutive. The information used to compute basic and diluted loss per common share was as follows: Quarter Ended Nine Months Ended September 30, September 30, 2017 2016 2017 2016 Net loss $ (4,863 ) $ (3,611 ) $ (18,057 ) $ (12,030 ) Weighted average shares outstanding (basic and diluted) 16,069,453 15,997,146 16,048,257 15,912,628 Net loss per common share: Basic $ (0.30 ) $ (0.23 ) $ (1.13 ) $ (0.76 ) Diluted $ (0.30 ) $ (0.23 ) $ (1.13 ) $ (0.76 )

Restructuring

Restructuring	9 Months Ended
	Sep. 30, 2017
Restructuring And Related Activities [Abstract]
Restructuring	Note 5. Restructuring On January 26, 2017, the Company committed to a plan to consolidate certain of its three-dimensional (“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 sand printing technology in North America which has resulted in a refocus of the Company’s operational strategy. As a result of these actions, during the quarter 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 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 operations and comprehensive loss. During the quarter ended June 30, 2017, the Company recorded a 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 have been no additional charges recorded associated with this plan in subsequent periods. There are no additional charges expected to be incurred associated with this plan in future periods. Charges associated with asset impairments 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 quarter 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, and a loss on disposal (recorded to cost of sales in the accompanying condensed statement of operations and comprehensive loss) during the quarter ended June 30, 2017, of approximately $42. Additionally, the Company recorded an impairment loss during the quarter 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. 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 operations and comprehensive loss) during the quarter ended June 30, 2017, of approximately $347. In April 2016, the Company committed to a plan to consolidate certain of its 3D printing operations in its Auburn, Washington facility into its North Las Vegas, Nevada facility and reorganize certain of its corporate departments as part of its 2016 operating plan. As a result of these actions, during the quarter ended June 30, 2016, the Company incurred a net charge of approximately $170 including, $57 associated with involuntary employee terminations and $113 associated with the disposal of certain property and equipment related to the Auburn, Washington facility which was either sold or abandoned. This net charge was split between cost of sales ($129), research and development ($2) and selling, general and administrative expenses ($39) in the accompanying statement of consolidated operations and comprehensive loss. In addition to the net charge incurred by the Company in connection with this plan, the Company also has an operating lease commitment for the Auburn, Washington facility with a lease term through December 2018. At the time of closure of this facility, the Company was able to secure a firmly committed sublease arrangement with a third party which fully offsets its remaining contractual operating lease liability. There have been no additional charges recorded associated with this plan in subsequent periods.

Impairment

Impairment	9 Months Ended
	Sep. 30, 2017
Asset Impairment Charges [Abstract]
Impairment	Note 6. Impairment During the quarter ended September 30, 2017, 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 for use at the asset group level. Assessing the recoverability of long-lived assets held for use 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 for use, the Company determined the carrying amount of long-lived assets held for use 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 for use, 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 for use 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 for use, resulting in a material adverse effect on the financial position and results of operations of the Company.

Cash, Cash Equivalents, and Res

Cash, Cash Equivalents, and Restricted Cash	9 Months Ended
	Sep. 30, 2017
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, 2017 2016 Cash and cash equivalents $ 17,706 $ 27,825 Restricted cash 1,098 330 Cash, cash equivalents, and restricted cash shown in the condensed statement of consolidated cash flows $ 18,804 $ 28,155 Restricted cash at September 30, 2017 includes approximately $768 associated with cash collateral required by a German bank for a financial guarantee issued by ExOne GmbH in connection with a commercial transaction requiring security. Restricted cash at both September 30, 2017 and December 31, 2016 includes approximately $330 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, 2017
Inventory Disclosure [Abstract]
Inventories	Note 8. Inventories Inventories consist of the following: September 30, December 31, 2017 2016 Raw materials and components $ 7,306 $ 7,429 Work in process 6,253 5,166 Finished goods 3,084 3,243 $ 16,643 $ 15,838 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, 2017 and December 31, 2016, the allowance for slow-moving and obsolete inventories was approximately $3,364 and $1,517, respectively, and has been reflected as a reduction to inventories (principally raw materials and components). Included in the allowance for slow-moving and obsolete inventories at September 30, 2017, is approximately $1,631 related to certain raw material and component inventories associated with the Company’s Exerial 3D printing machine platform (see further discussion below). During the quarter 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 and improvements to the underlying platform (rendering certain elements of the previous design obsolete). During the quarter ended June 30, 2016, the Company recorded a credit of approximately $507 to cost of sales in the accompanying condensed statement of consolidated operations and comprehensive loss attributable to the reversal of a previously recorded reserve for certain inventories associated with the Company’s laser micromachining product line which was discontinued at the end of 2014, based on the sale of such laser micromachining inventories during the period. During the quarter and nine months ended September 30, 2017, the Company recorded a (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 work in process inventories for which cost was determined to exceed net realizable value. There were no such credits or charges recorded by the Company during the quarter or nine months ended September 30, 2016.

Product Warranty Reserves

Product Warranty Reserves	9 Months Ended
	Sep. 30, 2017
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 reflected in accrued expenses and other current liabilities in the accompanying condensed consolidated balance sheet for each respective period): Quarter Ended Nine Months Ended September 30, September 30, 2017 2016 2017 2016 Balance at beginning of period $ 1,075 $ 992 $ 1,115 $ 1,308 Provisions for new issuances 243 403 763 699 Payments (174 ) (146 ) (427 ) (648 ) Reserve adjustments (100 ) (89 ) (466 ) (235 ) Foreign currency translation adjustments 14 4 73 40 Balance at end of period $ 1,058 $ 1,164 $ 1,058 $ 1,164

Contingencies and Commitments

Contingencies and Commitments	9 Months Ended
	Sep. 30, 2017
Commitments And Contingencies Disclosure [Abstract]
Contingencies and Commitments	Note 10. Contingencies and Commitments Contingencies 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, such payment made on July 5, 2017) and the related cost of sales, during the quarter ending September 30, 2017. The Company and its subsidiaries are subject to various litigation, claims, and proceedings which have been or may be instituted or asserted from time to time in the ordinary course of business. Other than the matter further described above, 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 financial guarantees and letters of credit to third parties in connection with certain commercial transactions requiring security. ExOne GmbH maintains a credit facility agreement 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 approximately $1,500 (€1,300). In addition, ExOne GmbH may use the credit facility agreement for short-term, fixed-rate loans in minimum increments of approximately $100 (€100) with minimum terms of at least thirty 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 agreement 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 agreement. There are no negative covenants associated with the credit facility agreement. The credit facility agreement has been guaranteed by the Company. At September 30, 2017 and December 31, 2016, there were no outstanding borrowings in the form of overdraft credit or short-term loans under the credit facility agreement. At September 30, 2017, total outstanding financial guarantees and letters of credit issued by ExOne GmbH under the credit facility agreement were approximately $865 (€732). Included in the total outstanding financial guarantees and letters of credit issued by ExOne GmbH are approximately $584 (€494) with expiration dates ranging from October In addition to amounts issued by ExOne GmbH under the credit facility agreement, during the quarter ended March 31, 2017, ExOne GmbH entered 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 security agreement except that the German bank required cash collateral to be posted by ExOne GmbH in connection with any related issuance. At September 30, 2017, total outstanding financial guarantees and letters of credit issued by ExOne GmbH under these separate agreements were approximately $768 (€650) which expired in October 2017.

Income Taxes

Income Taxes	9 Months Ended
	Sep. 30, 2017
Income Tax Disclosure [Abstract]
Income Taxes	Note 11. Income Taxes The provision for income taxes for the quarters ended September 30, 2017 and 2016 was $14 and $25, respectively. The provision for income taxes for the nine months ended September 30, 2017 and 2016 was $23 and $43, respectively. The Company has completed a discrete period computation of its provision for income taxes for each of the periods presented. Discrete period computation is as a result of 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 quarters ended September 30, 2017 and 2016 was 0.3% (provision on a loss) and 0.7% (provision on a loss), respectively. The effective tax rate for the nine months ended September 30, 2017 and 2016 was 0.1% (provision on a loss) and 0.4% (provision on a loss), respectively. The effective tax rate differs from the United States federal statutory rate of 34.0% for each of the periods presented primarily due to net changes in valuation allowances for the periods. The Company has provided a valuation allowance for its net deferred tax assets as a result of the Company not generating consistent net operating profits in jurisdictions 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, 2017 and December 31, 2016, the liability for uncertain tax positions was approximately $846 and $754, respectively, and is included in accrued expenses and other current liabilities in the accompanying condensed consolidated balance sheet. At September 30, 2017 and December 31, 2016, the Company had an additional liability for uncertain tax positions related to its ExOne GmbH (Germany) subsidiary of approximately $304 and $232, respectively, which were fully offset against net operating loss carryforwards. At September 30, 2017 and December 31, 2016, the Company had an additional liability for uncertain tax positions related to its ExOne KK (Japan) subsidiary of approximately $554 and $416, respectively, which were fully offset against net operating loss carryforwards. In July 2017, local taxing authorities in Japan completed their examination of the Company’s ExOne KK (2014-2016) subsidiary, resulting in an income tax obligation of approximately $5, which was reflected in the provision for income taxes in the accompanying condensed statement of consolidated operations during the quarter ended June 30, 2017. At September 30, 2017, 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, 2017
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Equity-Based Compensation	Note 12. Equity-Based Compensation On January 24, 2013, the Board of Directors of the Company adopted the 2013 Equity Incentive Plan (the “Plan”). In connection with the adoption of the Plan, 500,000 shares of common stock were reserved for issuance pursuant to the Plan, with automatic increases in such reserve available each year annually on January 1 from 2014 through 2023 equal to the lesser of 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 of Directors, provided that the maximum number of shares authorized under the Plan will not exceed 1,992,241 shares, subject to certain adjustments. Stock options and restricted stock issued by the Company 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 vest immediately upon issuance. Stock options issued by the Company have a contractual life which expires 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 . The following table summarizes the total equity-based compensation expense recognized for awards issued under the Plan: Quarter Ended Nine Months Ended September 30, September 30, 2017 2016 2017 2016 Equity-based compensation expense recognized: Stock options $ 768 $ 347 $ 1,244 $ 490 Restricted stock 440 203 799 614 Total equity-based compensation expense before income taxes 1,208 550 2,043 1,104 Benefit for income taxes* — — — — Total equity-based compensation expense net of income taxes $ 1,208 $ 550 $ 2,043 $ 1,104 * 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, 2017, total future compensation expense related to unvested awards yet to be recognized by the Company was approximately $1,145 for stock options and $449 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 1.3 years. 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: February 10, 2017 August 14, 2017 Weighted average fair value per stock option $5.46 - $5.75 $3.40 - $4.38 Volatility 62.89% - 63.75% 61.68% - 67.92% Average risk-free interest rate 1.89% - 1.94% 1.40% - 1.82% Dividend yield 0.00% 0.00% Expected term (years) 5.0 - 5.5 2.5 - 5.5 During the nine months ended September 30, 2016, 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 12, 2016 August 19, 2016 Weighted average fair value per stock option $8.07 $7.97 Volatility 66.43% 66.24% Average risk-free interest rate 1.18% 1.20% Dividend yield 0.00% 0.00% Expected term (years) 6.0 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 2017 2016 Number Options Weighted Weighted Average Grant Date Fair Value Number Options Weighted Weighted Average Grant Date Fair Value Outstanding at beginning of period 314,303 $ 15.62 $ 9.38 210,970 $ 17.43 $ 10.67 Stock options granted 389,000 $ 8.16 $ 3.89 139,000 $ 13.72 $ 8.00 Stock options exercised — $ — $ — — $ — $ — Stock options forfeited (500 ) $ 15.74 $ 9.60 (6,001 ) $ 15.74 $ 9.60 Stock options expired (6,666 ) $ 17.43 $ 10.67 (26,332 ) $ 17.74 $ 10.87 Outstanding at end of period 696,137 $ 11.51 $ 6.35 317,637 $ 15.77 $ 9.48 Stock options exercisable at end of period 427,953 $ 12.67 $ 7.16 178,304 $ 17.01 $ 10.32 Stock options expected to vest at end of period 268,184 $ 9.66 $ 5.06 132,908 $ 14.18 $ 8.38 At September 30, 2017, intrinsic value associated with stock options exercisable was approximately $586. At September 30, 2017, intrinsic value associated with stock options expected to vest was approximately $659. The weighted average remaining contractual term of stock options exercisable and expected to vest at September 30, 2017, was approximately 6.7 years and 7.2 years, respectively. There were no stock option exercises during the nine months ended September 30, 2017 or 2016. The activity for restricted stock was as follows: Nine Months Ended 2017 2016 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 94,171 $ 14.29 77,670 $ 19.57 Restricted stock granted 60,000 $ 9.01 74,500 $ 11.78 Restricted stock vested (74,999 ) $ 12.40 (35,998 ) $ 19.25 Restricted stock forfeited (11,667 ) $ 14.28 (3,668 ) $ 19.46 Outstanding at end of period 67,505 $ 11.69 112,504 $ 14.52 Restricted stock expected to vest at end of period 67,505 $ 11.69 112,504 $ 14.52 Restricted stock vested during the nine months ended September 30, 2017 and 2016, had a fair value of approximately $670 and $351, respectively.

Fair Value Measurements

Fair Value Measurements	9 Months Ended
	Sep. 30, 2017
Fair Value Disclosures [Abstract]
Fair Value Measurements	Note 13. 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 quarter 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 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 quarter 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) for all periods have been recorded to other (income) expense – net in the accompanying condensed statement of consolidated operations and comprehensive loss. The Company has classified both contracts as Level 2 fair value measurements. 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, 2017 2016 Carrying Value Fair Value Carrying Value Fair Value Cash and cash equivalents $ 17,706 $ 17,706 $ 27,825 $ 27,825 Restricted cash $ 1,098 $ 1,098 $ 330 $ 330 Current portion of long-term debt* $ 135 $ 140 $ 132 $ 138 Current portion of capital leases $ 25 $ 25 $ 72 $ 72 Long-term debt ̶ $ 1,543 $ 1,570 $ 1,644 $ 1,674 Capital leases ̶ $ 41 $ 41 $ 10 $ 10 * Carrying values at September 30, 2017 and December 31, 2016 are net of unamortized debt issuance costs of approximately $32 and $36, 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 are classified in 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 are classified in Level 2 .

Concentration of Credit Risk

Concentration of Credit Risk	9 Months Ended
	Sep. 30, 2017
Risks And Uncertainties [Abstract]
Concentration of Credit Risk	Note 14. Concentration of Credit Risk During the quarters and nine months ended September 30, 2017 and 2016, 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 quarters ended September 30, 2017 and 2016, the Company’s five most significant customers represented approximately 46.0% and 36.0% of total revenue, respectively. For the nine months ended September 30, 2017 and 2016, the Company’s five most significant customers represented approximately 22.2% and 21.4% of total revenue, respectively. At September 30, 2017 and December 31, 2016, accounts receivable from the Company’s five most significant customers were approximately $2,293 and $1,867, respectively.

Related Party Transactions

Related Party Transactions	9 Months Ended
	Sep. 30, 2017
Related Party Transactions [Abstract]
Related Party Transactions	Note 15. Related Party Transactions Revenues Sales of products and/or services to related parties for the quarters ended September 30, 2017 and 2016 were approximately $8 and $1, respectively. Sales of products and/or services to related parties for the nine months ended September 30, 2017 and 2016 were approximately $25 and $73, respectively. None of the transactions met a threshold requiring review and approval by the Audit Committee of the Board of Directors of the Company. There were no amounts due from related parties at September 30, 2017. Expenses During the quarters ended September 30, 2017 and 2016, purchases from related parties were approximately $4 and $3, respectively. During the nine months ended September 30, 2017 and 2016, purchases from related parties were approximately $12 and $13, respectively. Purchases by the Company during the quarters and nine months ended September 30, 2017 and 2016 included website design services and leased office space from related parties under common control by the Executive Chairman of the Company (formerly the Chairman and CEO of the Company through August 19, 2016). None of the transactions met a threshold requiring review and approval by the Audit Committee of the Board of Directors of the Company. The Company also receives the benefit of the corporate use of an airplane from a related party under common control by the Executive Chairman of the Company (formerly the Chairman and CEO of the Company through August 19, 2016) for no consideration. The Company estimates the fair market value of the benefits received during the quarter and nine months ended September 30, 2016 were approximately $17 and $21, respectively. There were no such benefits received during the quarter or nine months ended September 30, 2017. Amounts due to related parties at September 30, 2017 and December 31, 2016, were approximately $1 and $1, respectively. Amounts due to related parties for both periods are reflected in accounts payable in the accompanying condensed consolidated balance sheet. Revolving Credit Facility with a Related Party On October 23, 2015, ExOne and its ExOne Americas LLC and ExOne GmbH subsidiaries, as guarantors, entered into a Credit Agreement (the “Credit Agreement”) with RHI Investments, LLC (“RHI”), a related party, on a $15,000 revolving credit facility to (i) assist the Company in its efforts to finance customer acquisition of its 3D printing machines and 3D printed and other products and services and (ii) provide additional funding for working capital and general corporate purposes. RHI was determined to be a related party based on common control by the former Chairman and CEO of the Company (the Executive Chairman of the Company effective August 19, 2016). Prior to execution, the Credit Agreement was subject to review and approval by a sub-committee of independent members of the Board of Directors of the Company (which included each of the members of the Audit Committee of the Board of Directors). The Company incurred approximately $215 in debt issuance costs associated with the Credit Agreement. On January 10, 2016, the Company delivered notice to RHI of its intent to terminate the Credit Agreement in connection with the closing of a registered direct offering of common stock to an entity under common control by the former Chairman and CEO of the Company . There were no borrowings under the Credit Agreement from January 1, 2016 through the effective date of its termination, January 13, 2016. In connection with the termination, the Company settled its remaining accrued interest under the Credit Agreement of approximately $5 relating to the commitment fee on the unused portion of the revolving credit facility . In addition, during the quarter ended March 31, 2016, the Company recorded approximately $204 to interest expense related to the accelerated amortization of debt issuance costs. Upon termination of the Credit Agreement, all liens and guaranties in respect thereof were released. Other Refer to Note 2 for further discussion relating to two separate equity offerings during the quarter ended March 31, 2016, certain elements of which qualified as related party transactions.

Subsequent Events

Subsequent Events	9 Months Ended
	Sep. 30, 2017
Subsequent Events [Abstract]
Subsequent Events	Note 16. 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, 2017
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); ExOne Sweden AB (Sweden); and through September 2016, MWT—Gesellschaft für Industrielle Mikrowellentechnik mbH (Germany). Collectively, the consolidated group is referred to as the “Company”. On September 15, 2016, the Company completed a transaction merging its MWT—Gesellschaft für Industrielle Mikrowellentechnik mbH (Germany) subsidiary with and into its ExOne GmbH (Germany) subsidiary. The purpose of this transaction was to further simplify the Company’s legal structure. There were no significant accounting or tax related impacts associated with the merger of these wholly owned subsidiaries. The Company filed a registration statement on Form S-3 (No. 333-203353) 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, 2016 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, 2016, which includes all disclosures required by GAAP. The preparation of these condensed consolidated financial statements requires the Company to make certain judgments, estimates and assumptions regarding uncertainties that affect the reported amounts of assets, liabilities, revenue and expenses and related disclosure of contingent assets and liabilities. Areas that require significant judgments, estimates and assumptions include accounting for accounts receivable (including the allowance for doubtful accounts); inventories (including the allowance for slow-moving and obsolete inventories); product warranty reserves; contingencies; income taxes (including the valuation allowance on certain deferred tax assets and liabilities for uncertain tax positions); equity-based compensation (including the valuation of certain equity-based compensation awards issued by the Company); and testing for impairment of long-lived assets (including the identification of asset groups by management, estimates of future cash flows of identified asset groups and fair value estimates used in connection with assessing the valuation of identified asset groups). The Company bases its estimates on historical experience and on various other assumptions that are believed to be reasonable, the results of which form the basis for making judgments about the carrying values of assets and liabilities that are not readily apparent from other sources. Actual results may differ from these estimates. Certain amounts relating to restricted cash ($330) and intangible assets – net ($668) in the accompanying condensed consolidated balance sheet at December 31, 2016, have been reclassified from prepaid expenses and other current assets and other noncurrent assets, respectively, to conform to current period presentation. Certain amounts relating to provision (recoveries) for slow-moving, obsolete and lower of cost or market inventories – net ($356) and amortization of debt issuance costs ($5) in the accompanying condensed statement of consolidated cash flows for the nine months ended September 30, 2016, have been reclassified from decrease in inventories and decrease in prepaid expenses and other assets, respectively, to conform to current period presentation.
Recently Adopted and Issued Accounting Guidance	Recently Adopted Accounting Guidance On January 1, 2017, the Company adopted Financial Accounting Standards Board (“FASB”) Accounting Standards Update (“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. On January 1, 2017, the Company adopted FASB ASU 2016-17, “Consolidation: Interests Held through Related Parties That Are under Common Control.” This ASU modifies former guidance with respect to how a decision maker that holds an indirect interest in a variable interest entity (“VIE”) through a common control party determines whether it is the primary beneficiary of the VIE as part of the analysis of whether the VIE would need to be consolidated. Under the ASU, a decision maker needs to consider only its proportionate indirect interest in the VIE held through a common control party. Previous guidance had required the decision maker to treat the common control party’s interest in the VIE as if the decision maker held the interest itself. The Company does not have significant involvement with entities subject to consolidation considerations impacted by VIE model factors addressed by this ASU. Management has determined that the adoption of this ASU did not have an impact on the condensed consolidated financial statements of the Company. On January 1, 2017, the Company adopted FASB ASU 2015-11, “Inventory: Simplifying the Measurement of Inventory.” This ASU requires inventories to be measured at the lower of cost and net realizable value, with net realizable value defined as the estimated selling price in the normal course of business, less reasonably predictable costs of completion, disposal and transportation. Management has determined that the adoption of this ASU did not have an impact on the condensed consolidated financial statements of the Company. Recently Issued Accounting Guidance The Company considers the applicability and impact of all ASUs issued by the FASB. Recently issued ASUs not listed below were assessed and determined to be either not applicable or are currently expected to have no impact on the consolidated financial statements of the Company. In May 2017, the FASB issued 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. This ASU becomes effective for the Company on January 1, 2018, and is to be applied prospectively to new awards granted after adoption. Management is currently evaluating the potential impact of this ASU on the consolidated financial statements of the Company. In August 2016, the FASB issued ASU 2016-15, “Statement of Cash Flows: Classification of Certain Cash Receipts and Cash Payments.” This ASU is intended to reduce diversity in practice in how certain cash receipts and payments are presented and classified in the statement of cash flows. The standard provides guidance in a number of situations including, among others, settlement of zero-coupon bonds, contingent consideration payments made after a business combination, proceeds from the settlement of insurance claims, and distributions received from equity method investees. The ASU also provides guidance for classifying cash receipts and payments that have aspects of more than one class of cash flows. This ASU becomes effective for the Company on January 1, 2019. Early adoption is permitted. Management is currently evaluating the potential impact of this ASU 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, or January 1, 2018, in the event that the Company no longer qualifies as an EGC. Early adoption is permitted, but the Company may adopt the changes no earlier than January 1, 2017 (regardless of EGC status). Management is currently evaluating the potential impact of these collective changes on the consolidated financial statements of the Company.
Loss Per Share	The Company presents basic and diluted loss per common share amounts. Basic loss per 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 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 Comprehensi24

Accumulated Other Comprehensive Loss (Tables)	9 Months Ended
	Sep. 30, 2017
Equity [Abstract]
Summary of Changes in the Components of Accumulated Other Comprehensive Loss	The following table summarizes changes in the components of accumulated other comprehensive loss: Quarter Ended Nine Months Ended September 30, September 30, Foreign currency translation adjustments 2017 2016 2017 2016 Balance at beginning of period $ (11,216 ) $ (11,736 ) $ (14,735 ) $ (13,535 ) Other comprehensive income 1,194 489 4,713 2,288 Balance at end of period $ (10,022 ) $ (11,247 ) $ (10,022 ) $ (11,247 )

Loss Per Share (Tables)

Loss Per Share (Tables)	9 Months Ended
	Sep. 30, 2017
Earnings Per Share [Abstract]
Computation of Basic and Diluted Loss Per Common Share	The information used to compute basic and diluted loss per common share was as follows: Quarter Ended Nine Months Ended September 30, September 30, 2017 2016 2017 2016 Net loss $ (4,863 ) $ (3,611 ) $ (18,057 ) $ (12,030 ) Weighted average shares outstanding (basic and diluted) 16,069,453 15,997,146 16,048,257 15,912,628 Net loss per common share: Basic $ (0.30 ) $ (0.23 ) $ (1.13 ) $ (0.76 ) Diluted $ (0.30 ) $ (0.23 ) $ (1.13 ) $ (0.76 )

Cash, Cash Equivalents, and R26

Cash, Cash Equivalents, and Restricted Cash (Tables)	9 Months Ended
	Sep. 30, 2017
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, 2017 2016 Cash and cash equivalents $ 17,706 $ 27,825 Restricted cash 1,098 330 Cash, cash equivalents, and restricted cash shown in the condensed statement of consolidated cash flows $ 18,804 $ 28,155

Inventories (Tables)

Inventories (Tables)	9 Months Ended
	Sep. 30, 2017
Inventory Disclosure [Abstract]
Schedule of Inventories	Inventories consist of the following: September 30, December 31, 2017 2016 Raw materials and components $ 7,306 $ 7,429 Work in process 6,253 5,166 Finished goods 3,084 3,243 $ 16,643 $ 15,838

Product Warranty Reserves (Tabl

Product Warranty Reserves (Tables)	9 Months Ended
	Sep. 30, 2017
Product Warranties Disclosures [Abstract]
Summary of Changes in Product Warranty Reserves	The following table summarizes changes in product warranty reserves (such amounts reflected in accrued expenses and other current liabilities in the accompanying condensed consolidated balance sheet for each respective period): Quarter Ended Nine Months Ended September 30, September 30, 2017 2016 2017 2016 Balance at beginning of period $ 1,075 $ 992 $ 1,115 $ 1,308 Provisions for new issuances 243 403 763 699 Payments (174 ) (146 ) (427 ) (648 ) Reserve adjustments (100 ) (89 ) (466 ) (235 ) Foreign currency translation adjustments 14 4 73 40 Balance at end of period $ 1,058 $ 1,164 $ 1,058 $ 1,164

Equity-Based Compensation (Tabl

Equity-Based Compensation (Tables)	9 Months Ended
	Sep. 30, 2017
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 for awards issued under the Plan: Quarter Ended Nine Months Ended September 30, September 30, 2017 2016 2017 2016 Equity-based compensation expense recognized: Stock options $ 768 $ 347 $ 1,244 $ 490 Restricted stock 440 203 799 614 Total equity-based compensation expense before income taxes 1,208 550 2,043 1,104 Benefit for income taxes* — — — — Total equity-based compensation expense net of income taxes $ 1,208 $ 550 $ 2,043 $ 1,104 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, 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: February 10, 2017 August 14, 2017 Weighted average fair value per stock option $5.46 - $5.75 $3.40 - $4.38 Volatility 62.89% - 63.75% 61.68% - 67.92% Average risk-free interest rate 1.89% - 1.94% 1.40% - 1.82% Dividend yield 0.00% 0.00% Expected term (years) 5.0 - 5.5 2.5 - 5.5 During the nine months ended September 30, 2016, 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 12, 2016 August 19, 2016 Weighted average fair value per stock option $8.07 $7.97 Volatility 66.43% 66.24% Average risk-free interest rate 1.18% 1.20% Dividend yield 0.00% 0.00% Expected term (years) 6.0 5.5
Summary of Activity for Stock Options	The activity for stock options was as follows: Nine Months Ended 2017 2016 Number Options Weighted Weighted Average Grant Date Fair Value Number Options Weighted Weighted Average Grant Date Fair Value Outstanding at beginning of period 314,303 $ 15.62 $ 9.38 210,970 $ 17.43 $ 10.67 Stock options granted 389,000 $ 8.16 $ 3.89 139,000 $ 13.72 $ 8.00 Stock options exercised — $ — $ — — $ — $ — Stock options forfeited (500 ) $ 15.74 $ 9.60 (6,001 ) $ 15.74 $ 9.60 Stock options expired (6,666 ) $ 17.43 $ 10.67 (26,332 ) $ 17.74 $ 10.87 Outstanding at end of period 696,137 $ 11.51 $ 6.35 317,637 $ 15.77 $ 9.48 Stock options exercisable at end of period 427,953 $ 12.67 $ 7.16 178,304 $ 17.01 $ 10.32 Stock options expected to vest at end of period 268,184 $ 9.66 $ 5.06 132,908 $ 14.18 $ 8.38
Summary of Activity for Restricted Stock Awards	The activity for restricted stock was as follows: Nine Months Ended 2017 2016 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 94,171 $ 14.29 77,670 $ 19.57 Restricted stock granted 60,000 $ 9.01 74,500 $ 11.78 Restricted stock vested (74,999 ) $ 12.40 (35,998 ) $ 19.25 Restricted stock forfeited (11,667 ) $ 14.28 (3,668 ) $ 19.46 Outstanding at end of period 67,505 $ 11.69 112,504 $ 14.52 Restricted stock expected to vest at end of period 67,505 $ 11.69 112,504 $ 14.52

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	9 Months Ended
	Sep. 30, 2017
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, 2017 2016 Carrying Value Fair Value Carrying Value Fair Value Cash and cash equivalents $ 17,706 $ 17,706 $ 27,825 $ 27,825 Restricted cash $ 1,098 $ 1,098 $ 330 $ 330 Current portion of long-term debt* $ 135 $ 140 $ 132 $ 138 Current portion of capital leases $ 25 $ 25 $ 72 $ 72 Long-term debt ̶ $ 1,543 $ 1,570 $ 1,644 $ 1,674 Capital leases ̶ $ 41 $ 41 $ 10 $ 10 * Carrying values at

Basis of Presentation - Additio

Basis of Presentation - Additional Information (Detail) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Jan. 01, 2017	Dec. 31, 2016
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
State of incorporation	Delaware
Date of incorporation	Jan. 1, 2013
Restricted cash	$ 1,098			$ 330
Intangible assets ̶ net	152			$ 668
Provision (recoveries) for slow-moving, obsolete and lower of cost or market inventories ̶ net	$ (1,872)	$ 356
Amortization of debt issuance costs		$ 5
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 ($)	Jan. 13, 2016	Jan. 11, 2016	Jan. 08, 2016	Sep. 09, 2013	Feb. 06, 2013	Sep. 30, 2017	Mar. 31, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Unrestricted net proceeds of secondary public offering									$ 595,000
Sale of common stock, value									$ 595,000
Net income (loss)						$ (4,863,000)		$ (18,057,000)
Cumulative unrestricted net proceeds of secondary public offering								168,361,000
Cash and cash equivalents						$ 17,706,000		$ 17,706,000		$ 27,825,000
IPO [Member]
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Common stock, new issuances					6,095,000
Common stock price per share					$ 18
Common stock, new shares sold by Company					5,483,333
Common stock, new shares sold by stockholder					611,667
Unrestricted net proceeds of initial public offering					$ 90,371,000
Secondary Public Offering [Member]
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Common stock, new issuances				3,054,400
Common stock price per share				$ 62
Common stock, new shares sold by Company				1,106,000
Common stock, new shares sold by stockholder				1,948,400
Unrestricted net proceeds of secondary public offering				$ 64,948,000
At Market Issuance Offering [Member] | FBR Capital Markets & Co. and MLV & Co. LLC [Member]
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Common stock, new shares sold by Company							91,940	0
Unrestricted net proceeds of secondary public offering							$ 595,000
Percentage of commission on sale of common stock			3.00%
Initial reimbursement of certain legal expenses			$ 25,000
Gross proceeds from the sale of shares							843,000
Offering costs							248,000
Payments related to initial reimbursement of certain legal expenses and commissions							$ 50,000
At Market Issuance Offering [Member] | FBR Capital Markets & Co. and MLV & Co. LLC [Member] | Maximum [Member]
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Sale of common stock, value			$ 50,000,000
At Market Issuance Offering [Member] | FBR Capital Markets & Co. and MLV & Co. LLC [Member] | Weighted Average [Member]
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Common stock price per share							$ 9.17
Registered Direct Offering [Member] | Rockwell Forest Products, Inc. and S. Kent Rockwell [Member]
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Common stock price per share		$ 9.13
Common stock, new shares sold by Company		1,423,877
Unrestricted net proceeds of secondary public offering	$ 12,447,000
Gross proceeds from the sale of shares	13,000,000
Offering costs	$ 553,000
Premium per share on closing price		$ 0.50

Accumulated Other Comprehensi33

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, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Statement Of Income And Comprehensive Income [Abstract]
Balance at beginning of period	$ (11,216)	$ (11,736)	$ (14,735)	$ (13,535)
Other comprehensive income	1,194	489	4,713	2,288
Balance at end of period	$ (10,022)	$ (11,247)	$ (10,022)	$ (11,247)

Accumulated Other Comprehensi34

Accumulated Other Comprehensive Loss - Additional Information (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
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, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Stock Option [Member]
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Potential shares of anti-dilutive common stock	696,137	317,637	696,137	317,637
Restricted Stock [Member]
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Potential shares of anti-dilutive common stock	67,505	112,504	67,505	112,504

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, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Earnings Per Share [Abstract]
Net loss	$ (4,863)	$ (3,611)	$ (18,057)	$ (12,030)
Weighted average shares outstanding (basic and diluted)	16,069,453	15,997,146	16,048,257	15,912,628
Net loss per common share:
Basic	$ (0.30)	$ (0.23)	$ (1.13)	$ (0.76)
Diluted	$ (0.30)	$ (0.23)	$ (1.13)	$ (0.76)

Restructuring - Additional Info

Restructuring - Additional Information (Detail) - USD ($)	May 09, 2017	Apr. 21, 2017	Jun. 30, 2017	Mar. 31, 2017	Jun. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Restructuring Cost And Reserve [Line Items]
Proceeds from sale of property and equipment						$ 3,702,000	$ 52,000
Gain on disposal of assets						$ 322,000	$ (163,000)
North Las Vegas, Nevada 3D Printing Operations [Member]
Restructuring Cost And Reserve [Line Items]
Total restructuring charges				$ 984,000
Involuntary employee terminations charges				110,000	$ 32,000
Other exit costs				7,000
Asset impairment charges				867,000
Additional charges expected to be incurred			$ 0
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]
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			42,000	859,000
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]
Proceeds from sale of property and equipment	$ 1,950,000
Direct cost of assets			$ 347,000
Gain on disposal of assets	$ 137,000
North Las Vegas, Nevada [Member] | Property Plant and Equipment [Member]
Restructuring Cost And Reserve [Line Items]
Gain on disposal of assets				$ 8,000
Auburn, Washington 3D Printing Operations [Member]
Restructuring Cost And Reserve [Line Items]
Total restructuring charges					170,000
Involuntary employee terminations charges					57,000
Additional charges expected to be incurred					0
Disposal charges of certain property and equipment					113,000
Auburn, Washington 3D Printing Operations [Member] | Cost of Sales [Member]
Restructuring Cost And Reserve [Line Items]
Disposal charges of certain property and equipment					129,000
Auburn, Washington 3D Printing Operations [Member] | Selling, General and Administrative Expenses [Member]
Restructuring Cost And Reserve [Line Items]
Disposal charges of certain property and equipment					39,000
Auburn, Washington 3D Printing Operations [Member] | Research and Development [Member]
Restructuring Cost And Reserve [Line Items]
Disposal charges of certain property and equipment					$ 2,000

Impairment - Additional Informa

Impairment - Additional Information (Detail)	9 Months Ended
	Sep. 30, 2017USD ($)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 R39

Cash, Cash Equivalents, and Restricted Cash - Schedule of Reconciliation of Cash, Cash Equivalents, and Restricted Cash (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016	Sep. 30, 2016	Dec. 31, 2015
Cash And Cash Equivalents [Abstract]
Cash and cash equivalents	$ 17,706	$ 27,825
Restricted cash	1,098	330
Cash, cash equivalents, and restricted cash shown in the condensed statement of consolidated cash flows	$ 18,804	$ 28,155	$ 30,143	$ 19,672

Cash, Cash Equivalents, and R40

Cash, Cash Equivalents, and Restricted Cash - Additional Information (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Cash Cash Equivalents And Restricted Cash [Line Items]
Restricted cash associated with cash collateral	$ 1,098	$ 330
German Bank [Member]
Cash Cash Equivalents And Restricted Cash [Line Items]
Restricted cash associated with cash collateral	768
United States Bank [Member]
Cash Cash Equivalents And Restricted Cash [Line Items]
Restricted cash associated with cash collateral	$ 330	$ 330

Inventories - Schedule of Inven

Inventories - Schedule of Inventories (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Inventory Disclosure [Abstract]
Raw materials and components	$ 7,306	$ 7,429
Work in process	6,253	5,166
Finished goods	3,084	3,243
Inventories	$ 16,643	$ 15,838

Inventories - Additional Inform

Inventories - Additional Information (Detail) - USD ($)	3 Months Ended				9 Months Ended
	Sep. 30, 2017	Jun. 30, 2017	Sep. 30, 2016	Jun. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Inventory [Line Items]
Allowance for slow-moving and obsolete inventories	$ 3,364,000				$ 3,364,000		$ 1,517,000
Inventory (credit) charge	(11,000)		$ 0		116,000	$ 0
Auburn, Washington 3D Printing Operations [Member]
Inventory [Line Items]
Allowance for slow-moving and obsolete inventories	$ 1,631,000				$ 1,631,000
Inventory (credit) charge		$ 1,460,000
Laser Micromachining Product [Member]
Inventory [Line Items]
Inventory (credit) charge				$ (507,000)

Product Warranty Reserves - Add

Product Warranty Reserves - Additional Information (Detail)	9 Months Ended
	Sep. 30, 2017
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, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Guarantees [Abstract]
Balance at beginning of period	$ 1,075	$ 992	$ 1,115	$ 1,308
Provisions for new issuances	243	403	763	699
Payments	(174)	(146)	(427)	(648)
Reserve adjustments	(100)	(89)	(466)	(235)
Foreign currency translation adjustments	14	4	73	40
Balance at end of period	$ 1,058	$ 1,164	$ 1,058	$ 1,164

Contingencies and Commitments -

Contingencies and Commitments - Additional Information (Detail) € in Thousands	Jul. 01, 2017USD ($)	Sep. 30, 2017USD ($)	Sep. 30, 2017USD ($)	Sep. 30, 2017EUR (€)	Dec. 31, 2016USD ($)	Dec. 31, 2016EUR (€)
Germany [Member] | German Bank [Member]
Line Of Credit Facility [Line Items]
Credit facility, maximum borrowing capacity		$ 1,500,000	$ 1,500,000	€ 1,300
Credit facility, minimum increments		100,000	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		865,000	$ 865,000	732	$ 400,000	€ 380
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		768,000	$ 768,000	650
Expiration date, description			October 2,017
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		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		$ 0
Germany [Member] | German Bank [Member] | Commercial Transactions Requiring Security Expiring From October Twenty Seventeen Through July Twenty Eighteen [Member]
Line Of Credit Facility [Line Items]
Credit facility, outstanding amount		584,000	$ 584,000	494
Expiration date, description			October 2017 through July 2018
Germany [Member] | German Bank [Member] | Commercial Transactions Requiring Security Without Expiration [Member]
Line Of Credit Facility [Line Items]
Credit facility, outstanding amount		281,000	$ 281,000	€ 238
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

Income Taxes - Additional Infor

Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Jun. 30, 2017	Dec. 31, 2016
Schedule Of Income Taxes [Line Items]
Provision (benefit) for income taxes	$ 14	$ 25	$ 23	$ 43
Effective tax rate	0.30%	0.70%	0.10%	0.40%
United States federal statutory rate	34.00%	34.00%	34.00%	34.00%
Liability for uncertain tax positions	$ 846		$ 846			$ 754
Income tax obligation					$ 5
Subsidiaries [Member] | Germany [Member]
Schedule Of Income Taxes [Line Items]
Liability for uncertain tax positions	304		304			232
Subsidiaries [Member] | Japan [Member]
Schedule Of Income Taxes [Line Items]
Liability for uncertain tax positions	$ 554		$ 554			$ 416

Equity-Based Compensation - Add

Equity-Based Compensation - Additional Information (Detail) - USD ($) $ in Thousands	Jan. 24, 2013	Sep. 30, 2017	Sep. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average remaining vesting period		1 year 3 months 19 days
Intrinsic value, stock options expected to vest		$ 659
Incentive stock options exercised		0	0
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total future compensation expense		$ 1,145
Intrinsic value, stock options exercisable		$ 586
Weighted average remaining contractual term of stock options exercisable		6 years 8 months 12 days
Weighted average remaining contractual term of stock options expected to vest		7 years 2 months 12 days
Incentive stock options exercised		0	0
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total future compensation expense		$ 449
Fair value of restricted shares vested		$ 670	$ 351
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
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

Equity-Based Compensation - Sum

Equity-Based Compensation - Summary of Total Equity-Based Compensation Expense Recognized for All ISOs, Restricted Stock and Stock Bonus Awards (Detail) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Equity-based compensation expense recognized:
Total equity-based compensation expense before income taxes		$ 1,208	$ 550	$ 2,043	$ 1,104
Benefit for income taxes	[1]	0	0	0	0
Total equity-based compensation expense net of income taxes		1,208	550	2,043	1,104
Stock Options [Member]
Equity-based compensation expense recognized:
Total equity-based compensation expense before income taxes		768	347	1,244	490
Restricted Stock [Member]
Equity-based compensation expense recognized:
Total equity-based compensation expense before income taxes		$ 440	$ 203	$ 799	$ 614
[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 - S49

Equity-Based Compensation - Summary of Total Equity-Based Compensation Expense Recognized for All ISOs, Restricted Stock and Stock Bonus Awards (Parenthetical) (Detail) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
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. 14, 2017	Feb. 10, 2017	Aug. 19, 2016	Aug. 12, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average fair value per stock option			$ 7.97	$ 8.07
Volatility			66.24%	66.43%
Average risk-free interest rate			1.20%	1.18%
Dividend yield	0.00%	0.00%	0.00%	0.00%
Expected term (years)			5 years 6 months	6 years
Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average fair value per stock option	$ 3.40	$ 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 - S51

Equity-Based Compensation - Summary of Activity for Stock Options (Detail) - $ / shares	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Stock options outstanding, Beginning balance	314,303	210,970
Stock options granted	389,000	139,000
Stock options exercised	0	0
Stock options forfeited	(500)	(6,001)
Stock options expired	(6,666)	(26,332)
Stock options outstanding, Ending balance	696,137	317,637
Stock options exercisable at end of period	427,953	178,304
Stock options expected to vest at end of period	268,184	132,908
Weighted average exercise price, Beginning balance	$ 15.62	$ 17.43
Weighted average exercise price, Stock options granted	8.16	13.72
Weighted average exercise price, Stock options exercised	0	0
Weighted average exercise price, Stock options forfeited	15.74	15.74
Weighted average exercise price, Stock options expired	17.43	17.74
Weighted average exercise price, Ending balance	11.51	15.77
Weighted average exercise price, Stock options exercisable	12.67	17.01
Weighted average exercise price, Stock options expected to vest, net of forfeitures	9.66	14.18
Weighted average grant date fair value, Beginning balance	9.38	10.67
Weighted average grant date fair value, Stock options granted	3.89	8
Weighted average grant date fair value, Stock options exercised	0	0
Weighted average grant date fair value, Stock options forfeited	9.60	9.60
Weighted average grant date fair value, Stock options expired	10.67	10.87
Weighted average grant date fair value, Ending balance	6.35	9.48
Weighted average grant date fair value, Stock options exercisable	7.16	10.32
Weighted average grant date fair value, Stock options expected to vest, net of forfeitures	$ 5.06	$ 8.38

Equity-Based Compensation - S52

Equity-Based Compensation - Summary of Activity for Restricted Stock Awards (Detail) - Restricted Stock [Member] - $ / shares	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Restricted Shares, outstanding, Beginning Balance	94,171	77,670
Number of Restricted Shares, granted	60,000	74,500
Number of Restricted Shares, vested	(74,999)	(35,998)
Number of Restricted Shares, forfeited	(11,667)	(3,668)
Number of Restricted Shares, outstanding, Ending Balance	67,505	112,504
Number of Restricted Shares, expected to vest	67,505	112,504
Weighted Average Grant Date Fair Value, Beginning Balance	$ 14.29	$ 19.57
Weighted Average Grant Date Fair Value, granted	9.01	11.78
Weighted Average Grant Date Fair Value, vested	12.40	19.25
Weighted Average Grant Date Fair Value, forfeited	14.28	19.46
Weighted Average Grant Date Fair Value, Ending Balance	11.69	14.52
Weighted Average Grant Date Fair Value, expected to vest	$ 11.69	$ 14.52

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
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Number of foreign exchange forward contracts			2	2
Gain realized on settlement of foreign exchange forward contracts	$ 14	€ 12	$ 16	€ 15

Fair Value Measurements - Carry

Fair Value Measurements - Carrying Values and Fair Values of Other Financial Instruments (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	$ 17,706	$ 27,825
Restricted cash	1,098	330
Current portion of long-term debt	135	132
Current portion of capital leases	25	72
Long-term debt ̶ net of current portion	1,543	1,644
Capital leases ̶ net of current portion	41	10
Carrying Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	17,706	27,825
Restricted cash	1,098	330
Current portion of long-term debt	135	132
Current portion of capital leases	25	72
Long-term debt ̶ net of current portion	1,543	1,644
Capital leases ̶ net of current portion	41	10
Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	17,706	27,825
Restricted cash	1,098	330
Current portion of long-term debt	140	138
Current portion of capital leases	25	72
Long-term debt ̶ net of current portion	1,570	1,674
Capital leases ̶ net of current portion	$ 41	$ 10

Fair Value Measurements - Car55

Fair Value Measurements - Carrying Values and Fair Values of Other Financial Instruments (Parenthetical) (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Fair Value Disclosures [Abstract]
Unamortized debt issuance costs	$ 32	$ 36

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, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Revenue, Major Customer [Line Items]
Accounts receivable from significant customers	$ 2,293		$ 2,293		$ 1,867
Customer Concentration Risk [Member] | Sales Revenue, Net [Member]
Revenue, Major Customer [Line Items]
Revenue concentration, by most significant customers	46.00%	36.00%	22.20%	21.40%

Related Party Transactions - Ad

Related Party Transactions - Additional Information (Detail)	Jan. 13, 2016USD ($)	Sep. 30, 2017USD ($)	Sep. 30, 2016USD ($)	Mar. 31, 2016USD ($)Offering	Sep. 30, 2017USD ($)	Sep. 30, 2016USD ($)	Dec. 31, 2016USD ($)	Oct. 23, 2015USD ($)
Related Party Transaction [Line Items]
Revenue - related party		$ 8,000	$ 1,000		$ 25,000	$ 73,000
Amounts due from related parties reflected in accounts receivable		0			0		$ 1,000
Prepayments received		8,000			8,000		0
Amounts due to related party		1,000			1,000		$ 1,000
Amortization of debt issuance costs					4,000	209,000
Number of separate equity offerings | Offering				2
Revolving Credit Facility [Member] | RHI Investments, LLC [Member]
Related Party Transaction [Line Items]
Line of credit facility, maximum borrowing capacity								$ 15,000,000
Debt issuance costs								$ 215,000
Credit facility, outstanding amount	$ 0
Interest expense relating to the commitment fee	$ 5,000
Commitment fee	1.00%
Amortization of debt issuance costs				$ 204,000
Former Chairman and Chief Executive Officer [Member]
Related Party Transaction [Line Items]
Purchases from related parties		4,000	3,000		12,000	13,000
Fair market value of benefits received from related party		$ 0	$ 17,000		$ 0	$ 21,000