ExOne (XONE) 10-Q 12 Nov 21 2021 Q3 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2021	Nov. 12, 2021
Cover [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2021
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q3
Trading Symbol	XONE
Entity Registrant Name	ExOne Co
Entity Central Index Key	0001561627
Current Fiscal Year End Date	--12-31
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	false
Entity Common Stock, Shares Outstanding		22,401,254
Document Quarterly Report	true
Document Transition Report	false
Entity Interactive Data Current	Yes
Entity Current Reporting Status	Yes
Entity Shell Company	false
Title of 12(b) Security	Common stock
Security Exchange Name	NASDAQ
Entity File Number	001-35806
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	46-1684608
Entity Address, Address Line One	127 Industry Boulevard
Entity Address, City or Town	North Huntingdon
Entity Address, State or Province	PA
Entity Address, Postal Zip Code	15642
City Area Code	724
Local Phone Number	863-9663

Condensed Statement of Consolid

Condensed Statement of Consolidated Operations and Comprehensive Loss - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Income Statement [Abstract]
Revenue	$ 19,043	$ 17,399	$ 50,846	$ 41,881
Cost of sales	13,721	13,500	38,648	31,263
Gross profit	5,322	3,899	12,198	10,618
Operating expenses
Research and development	2,909	2,013	8,541	6,858
Selling, general and administrative	9,585	4,825	22,676	15,476
Gain from sale-leaseback of property and equipment				(1,462)
Total operating expenses	12,494	6,838	31,217	20,872
Loss from operations	(7,172)	(2,939)	(19,019)	(10,254)
Other (income) expense
Interest expense	2	54	169	171
Other (income) expense ̶ net	(48)	314	63	319
Gain on extinguishment of the Paycheck Protection Program loan	(2,220)		(2,220)
Total other (income) expense	(2,266)	368	(1,988)	490
Loss before income taxes	(4,906)	(3,307)	(17,031)	(10,744)
Provision (benefit) for income taxes	1	(34)	(410)	200
Net loss	$ (4,907)	$ (3,273)	$ (16,621)	$ (10,944)
Net loss per common share:
Basic	$ (0.22)	$ (0.19)	$ (0.76)	$ (0.65)
Diluted	$ (0.22)	$ (0.19)	$ (0.76)	$ (0.65)
Comprehensive loss:
Net loss	$ (4,907)	$ (3,273)	$ (16,621)	$ (10,944)
Other comprehensive (loss) income:
Foreign currency translation adjustments	(465)	856	(1,362)	388
Comprehensive loss	$ (5,372)	$ (2,417)	$ (17,983)	$ (10,556)

Condensed Consolidated Balance

Condensed Consolidated Balance Sheet - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 122,809	$ 49,668
Restricted cash	1,870	508
Accounts receivable ̶ net	8,712	5,225
Current portion of net investment in sales-type leases ̶ net	241	229
Inventories ̶ net	25,078	20,562
Prepaid expenses and other current assets	6,313	4,451
Total current assets	165,023	80,643
Property and equipment, net of accumulated depreciation of $20,041 (2021) and $20,823 (2020)	22,815	21,300
Operating lease right-of-use assets	2,489	4,043
Net investment in sales-type leases ̶ net of current portion ̶ net	326	509
Other noncurrent assets	687	794
Total assets	191,340	107,289
Current liabilities:
Current portion of long-term debt		1,622
Current portion of operating lease liabilities	1,926	1,958
Accounts payable	7,657	4,501
Accrued expenses and other current liabilities	6,766	4,978
Current portion of contract liabilities	16,729	13,586
Total current liabilities	33,078	26,645
Long-term debt ̶ net of current portion		1,783
Operating lease liabilities ̶ net of current portion	563	2,085
Contract liabilities ̶ net of current portion	31	159
Other noncurrent liabilities	328	314
Total liabilities	34,000	30,986
Contingencies and commitments
Stockholders' equity
Common stock, $0.01 par value, 200,000,000 shares authorized, 22,179,243 (2021) and 20,009,157 (2020) shares issued and outstanding	222	200
Additional paid-in capital	317,111	218,113
Accumulated deficit	(148,493)	(131,872)
Accumulated other comprehensive loss	(11,500)	(10,138)
Total stockholders' equity	157,340	76,303
Total liabilities and stockholders' equity	$ 191,340	$ 107,289

Condensed Consolidated Balanc_2

Condensed Consolidated Balance Sheet (Parenthetical) - USD ($)	Sep. 30, 2021	Dec. 31, 2020
Statement Of Financial Position [Abstract]
Accumulated depreciation	$ 20,041	$ 20,823
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	200,000,000	200,000,000
Common stock, shares issued	22,179,243	20,009,157
Common stock, shares outstanding	22,179,243	20,009,157

Condensed Statement of Consol_2

Condensed Statement of Consolidated Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Operating activities
Net loss	$ (16,621)	$ (10,944)
Adjustments to reconcile net loss to net cash used for operations:
Depreciation and amortization	2,746	2,925
Equity-based compensation	1,108	828
Amortization of debt issuance costs	7	39
Recoveries for bad debts ̶ net	(38)	(4)
Provision for slow-moving, obsolete and lower of cost or net realizable value inventories ̶ net	378	335
Foreign exchange losses on intercompany transactions ̶ net	73	250
Gain from sale-leaseback of property and equipment		(1,462)
Deferred income taxes		195
Gain on extinguishment of debt - net	(2,101)
Changes in assets and liabilities, excluding effects of foreign currency translation adjustments:
(Increase) decrease in accounts receivable	(3,666)	1,092
Decrease in net investment in sales-type leases	170	158
Increase in inventories	(7,226)	(3,310)
Increase in prepaid expenses and other assets	(173)	(1,682)
Increase (decrease) in accounts payable	3,303	(1,679)
Increase in accrued expenses and other liabilities	624	396
Increase in contract liabilities	3,370	248
Net cash used for operating activities	(18,046)	(12,615)
Investing activities
Capital expenditures	(3,451)	(772)
Proceeds from sale of property and equipment		16,229
Net cash (used for) provided by investing activities	(3,451)	15,457
Financing activities
Proceeds from borrowings on long-term debt		2,194
Payments on long-term debt	(1,226)	(117)
Proceeds from exercise of employee stock options	2,429	858
Proceeds from common stock offerings, net of issuance costs	95,288	27,699
Taxes related to the net share settlement of equity-based awards	(7)	(15)
Other	(24)	(63)
Net cash provided by financing activities	96,460	30,556
Effect of exchange rate changes on cash, cash equivalents, and restricted cash	(460)	295
Net change in cash, cash equivalents, and restricted cash	74,503	33,693
Cash, cash equivalents, and restricted cash at beginning of period	50,176	6,243
Cash, cash equivalents, and restricted cash at end of period	124,679	39,936
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	2,943	1,434
Transfer of internally developed 3D printing machines from property and equipment to inventories for sale	1,333	2,771
Property and equipment included in accounts payable	246	113
Unsettled proceeds from exercise of employee stock options included in prepaid expenses and other current assets	$ 31
At-the-market offering issuance costs included in accounts payable		147
At-the-market offering issuance costs included in accrued expense and other current liabilities		$ 66

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, 2019	$ 48,582	$ 163	$ 176,850	$ (116,948)	$ (11,483)
Beginning Balance, Shares at Dec. 31, 2019		16,347,000
Net loss	(3,648)			(3,648)
Other comprehensive income (loss)	(838)				(838)
Equity-based compensation	292	$ 1	291
Common stock issued from equity incentive plan, shares		39,000
Ending Balance at Mar. 31, 2020	44,388	$ 164	177,141	(120,596)	(12,321)
Ending Balance, Shares at Mar. 31, 2020		16,386,000
Beginning Balance at Dec. 31, 2019	48,582	$ 163	176,850	(116,948)	(11,483)
Beginning Balance, Shares at Dec. 31, 2019		16,347,000
Net loss	$ (10,944)
Exercise of employee stock options, shares	117,854
Ending Balance at Sep. 30, 2020	$ 67,183	$ 190	205,980	(127,892)	(11,095)
Ending Balance, Shares at Sep. 30, 2020		18,988,000
Beginning Balance at Mar. 31, 2020	44,388	$ 164	177,141	(120,596)	(12,321)
Beginning Balance, Shares at Mar. 31, 2020		16,386,000
Net loss	(4,023)			(4,023)
Other comprehensive income (loss)	370				370
Equity-based compensation	157		157
Exercise of employee stock options	541	$ 1	540
Exercise of employee stock options, shares		73,000
Common stock issued from equity incentive plan, shares		22,000
At-the-market offerings of common stock, net of issuance costs	3,098	$ 4	3,094
At the market offerings of common stock,net of issuance costs, shares		383,000
Ending Balance at Jun. 30, 2020	44,531	$ 169	180,932	(124,619)	(11,951)
Ending Balance, Shares at Jun. 30, 2020		16,864,000
Net loss	(3,273)			(3,273)
Other comprehensive income (loss)	856				856
Equity-based compensation	379		379
Exercise of employee stock options	317		317
Exercise of employee stock options, shares		44,000
Common stock issued from equity incentive plan, shares		20,000
Tax withholding related to the net share settlement of equity-based awards	(15)		(15)
Tax withholding related to the net share settlement of equity-based awards, shares		(1,000)
At-the-market offerings of common stock, net of issuance costs	24,388	$ 21	24,367
At the market offerings of common stock,net of issuance costs, shares		2,061,000
Ending Balance at Sep. 30, 2020	67,183	$ 190	205,980	(127,892)	(11,095)
Ending Balance, Shares at Sep. 30, 2020		18,988,000
Beginning Balance at Dec. 31, 2020	$ 76,303	$ 200	218,113	(131,872)	(10,138)
Beginning Balance, Shares at Dec. 31, 2020	20,009,157	20,009,000
Net loss	$ (6,140)			(6,140)
Other comprehensive income (loss)	(1,120)				(1,120)
Equity-based compensation	282		282
Exercise of employee stock options	1,440	$ 1	1,439
Exercise of employee stock options, shares		111,000
Common stock issued from equity incentive plan, shares		37,000
Common stock offering, net of issuance costs	95,459	$ 19	95,440
Common stock offering, net of issuance costs, shares		1,873,000
Ending Balance at Mar. 31, 2021	166,224	$ 220	315,274	(138,012)	(11,258)
Ending Balance, Shares at Mar. 31, 2021		22,030,000
Beginning Balance at Dec. 31, 2020	$ 76,303	$ 200	218,113	(131,872)	(10,138)
Beginning Balance, Shares at Dec. 31, 2020	20,009,157	20,009,000
Net loss	$ (16,621)
Exercise of employee stock options, shares	208,259
Ending Balance at Sep. 30, 2021	$ 157,340	$ 222	317,111	(148,493)	(11,500)
Ending Balance, Shares at Sep. 30, 2021	22,179,243	22,179,000
Beginning Balance at Mar. 31, 2021	$ 166,224	$ 220	315,274	(138,012)	(11,258)
Beginning Balance, Shares at Mar. 31, 2021		22,030,000
Net loss	(5,574)			(5,574)
Other comprehensive income (loss)	223				223
Equity-based compensation	376		376
Exercise of employee stock options	9		9
Exercise of employee stock options, shares		2,000
Common stock issued from equity incentive plan, shares		1,000
Ending Balance at Jun. 30, 2021	161,258	$ 220	315,659	(143,586)	(11,035)
Ending Balance, Shares at Jun. 30, 2021		22,033,000
Net loss	(4,907)			(4,907)
Other comprehensive income (loss)	(465)				(465)
Equity-based compensation	450	$ 1	449
Exercise of employee stock options	1,011	$ 1	1,010
Exercise of employee stock options, shares		96,000
Common stock issued from equity incentive plan, shares		50,000
Tax withholding related to the net share settlement of equity-based awards	(7)		(7)
Ending Balance at Sep. 30, 2021	$ 157,340	$ 222	$ 317,111	$ (148,493)	$ (11,500)
Ending Balance, Shares at Sep. 30, 2021	22,179,243	22,179,000

Basis of Presentation

Basis of Presentation	9 Months Ended
	Sep. 30, 2021
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, and its wholly-owned subsidiaries, ExOne Americas LLC (United States); ExOne GmbH (Germany); ExOne Property GmbH (Germany); and ExOne KK (Japan). Collectively, the consolidated group is referred to as the “Company”. 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, 2020 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, 2020, 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; revenue (including the allocation of a sales contract’s total transaction price to each performance obligation for contracts with multiple performance obligations); and equity-based compensation (including the valuation of certain equity-based compensation awards issued by the Company). 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. Merger Transaction On August 11, 2021, the Company entered into an Agreement and Plan of Merger (the “Merger Agreement”) with Desktop Metal, Inc., a Delaware corporation (“DM”), Texas Merger Sub I, Inc., a Delaware corporation and wholly-owned subsidiary of DM (“Merger Sub I”) and Texas Merger Sub II, LLC, a Delaware limited liability company and wholly-owned subsidiary of DM (“Merger Sub II”). Upon the terms and subject to the conditions set forth in the Merger Agreement, Merger Sub I will merge with and into the Company, with the Company surviving the merger as a wholly owned subsidiary of DM (the “First Merger”) and immediately thereafter, the Company will merge with and into Merger Sub II, with Merger Sub II surviving the subsequent merger (the “Second Merger”, and, together with the First Merger, the “Mergers”). Subject to the terms and conditions of the Merger Agreement, stockholders of the Company will receive, in exchange for each share of our common stock held immediately prior to the Mergers, (i) $8.50 in cash and (ii) a number of shares of DM common stock, equal to the Exchange Ratio (defined below). The “Exchange Ratio” shall be determined based on DM’s 20-day average closing stock price three trading days prior to closing: (i) if the average closing DM stock price is greater than or equal to $9.70, then the Exchange Ratio shall be set at 1.7522; (ii) if the average closing DM stock price is less than or equal to $7.94, then the Exchange Ratio shall be set at 2.1416; (iii) if the average closing DM stock price is less than $9.70 but greater than $7.94, then the Exchange Ratio shall be equal to 1.9274 multiplied by the quotient of (x) $8.82 divided by (y) the average closing DM stock price. On October 20, 2021, the Company and DM received clearance from the German Federal Ministry for Economic Affairs and Energy, a foreign investment regulatory authority, that the transactions contemplated by the Merger Agreement have been cleared pursuant to section 58a paragraph 1 of the German Foreign Trade and Payments Ordinance. Additionally, the waiting period under the Hart-Scott-Rodino Antitrust Improvements Act of 1976, as amended, expired on October 28, 2021 at 11:59 p.m. Eastern Time. Accordingly, the Company and DM have now received all regulatory approvals required as a condition to consummate the Mergers. On November 9, 2021, the Company held a special meeting of stockholders. At that special meeting, the ExOne stockholders voted to approve the Merger Agreement. Pursuant to the Merger Agreement, the proposed transaction may close as soon as three business days following the date of the special meeting of ExOne stockholders, subject to customary closing conditions. During the three months and nine months ended September 30, 2021, the Company incurred expenses associated with the planned merger transaction of $3,376 and $3,477, respectively, all of which are included in selling, general and administrative expenses in the accompanying condensed statement of consolidated operations and comprehensive loss. COVID-19 In March 2020, the World Health Organization declared the novel strain of coronavirus a global pandemic (“COVID-19”) and recommended containment and mitigation measures worldwide. The impact of COVID-19 and the related economic, business and market disruptions were wide-ranging and continue to be significant. As a result of COVID-19, the Company was required to temporarily close its operations at its North Huntingdon, Pennsylvania facility for the period from March 23 through March 30, 2020. In response to COVID-19, the Company has incurred incremental costs associated with protecting the health and safety of the Company’s global workforce, enhanced sanitization of the Company’s global operating facilities, and information technology capabilities for employees operating remotely. Beginning in March 2020, restrictions imposed by various governmental authorities on both domestic and international shipping and travel have caused disruptions to the timing of delivery and installation of the Company’s three-dimensional (“3D”) printing machines, resulting in negative impacts to the Company’s financial position, results of operations and cash flows. The duration and severity of the outbreak and its long-term impact on the Company’s business remain uncertain. The Company is unable to predict the impact that COVID-19 will have on its future financial position, results of operations and cash flows. Recently Issued Accounting Guidance The Company considers the applicability and impact of all Accounting Standards Updates (“ASUs”) issued by the Financial Accounting Standards Board (the “FASB”). Recently issued ASUs not listed below either were assessed and determined to be not applicable or are currently expected to have no impact on the consolidated financial statements of the Company. In May 2021, the FASB issued ASU 2021-04, “Issuer’s Accounting for Certain Modifications or Exchanges of Freestanding Equity-Classified Written Call Options”. This ASU clarifies the accounting treatment for freestanding equity-classified written call options that are modified or exchanged as part of or directly related to a modification or an exchange of existing debt. This ASU becomes effective for the Company on January 1, 2022. Early adoption is permitted. This guidance would only be applicable to the consolidated financial statements of the Company in the event that freestanding equity-classified written call options were modified or exchanged as a part of or directly related to the modification or exchange of existing debt. As no such transactions have occurred during the current year and no such transactions are anticipated, management determined that the adoption of this ASU will not have an impact on the consolidated financial statements of the Company. In June 2016, the FASB issued ASU 2016-13, “Financial Instruments – Credit Losses.” This ASU added a new impairment model (known as the current expected credit loss (“CECL”) model) that is based on expected losses rather than incurred losses. Under the new guidance, an entity recognizes as an allowance its estimate of expected credit losses. The CECL model applies to most debt instruments, trade receivables, lease receivables, financial guarantee contracts, and other loan commitments. The CECL model does not have a minimum threshold for recognition of impairment losses and entities will need to measure expected credit losses on assets that have a low risk of loss. As a smaller reporting company pursuant to Rule 12b-2 of the Securities Exchange Act of 1934, as amended, these changes become effective for the Company on January 1, 2023. Management is currently evaluating the potential impact of these changes on the consolidated financial statements of the Company.

Common Stock Offerings

Common Stock Offerings	9 Months Ended
	Sep. 30, 2021
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Common Stock Offering	Note 2. Common Stock Offerings In September 2020, the Company entered into an Equity Distribution Agreement with Canaccord Genuity LLC (“Canaccord”) pursuant to which Canaccord agreed to act as sales agent in the sale of up to $25,000 in the aggregate of ExOne common stock in “at-the-market offerings” as defined in Rule 415 under the Securities Act of 1933, as amended (the “Securities Act”). In February 2021, the Company terminated the Equity Distribution Agreement. At the time of the termination of the Equity Distribution Agreement, the remaining maximum offering capacity was $9,269. The Company did not sell any shares of its common stock under the Equity Distribution Agreement during 2021 prior to its termination. There were no fees or penalties incurred by the Company in connection with the termination of the Equity Distribution Agreement. In February 2021, following the termination of the Equity Distribution Agreement, the Company entered into an underwriting agreement with Stifel, Nicolaus & Company, Incorporated, Canaccord and certain other underwriters pursuant to which the Company agreed to issue and sell up to 1,666,667 shares of its common stock at a public offering price of $54.00 per share. Under the agreement, the Company agreed to pay underwriting discounts and commissions of $2.835 per share, as well as reimburse the underwriters for certain expenses. In addition, the Company granted the underwriters a 30-day option to purchase up to an additional 205,907 shares of its common stock at the public offering price, less underwriting discounts and commissions. The underwriters exercised their option to purchase 205,907 shares of the Company’s stock in-full. As a result of this common stock offering, during February 2021, the Company sold 1,872,574 shares of its common stock and received net proceeds (after deducting underwriting discounts and commissions) of $95,725. The Company incurred expenses (other than underwriting discounts and commissions) associated with the common stock offering of $ 266 , all of which was recognized during the three months ended March 31, 2021 . The Company has not sold any shares of its common stock through common stock offerings subsequent to the February 2021 common stock offering.

Accumulated Other Comprehensive

Accumulated Other Comprehensive Loss	9 Months Ended
	Sep. 30, 2021
Equity [Abstract]
Accumulated Other Comprehensive Loss	Note 3. Accumulated Other Comprehensive Loss The following table summarizes changes in the components of accumulated other comprehensive loss for the periods indicated: Three Months Ended Nine Months Ended September 30, September 30, 2021 2020 2021 2020 Foreign currency translation adjustments Balance at beginning of period $ (11,035 ) $ (11,951 ) $ (10,138 ) $ (11,483 ) Other comprehensive (loss) income (465 ) 856 (1,362 ) 388 Balance at end of period $ (11,500 ) $ (11,095 ) $ (11,500 ) $ (11,095 ) 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 any of the periods presented.

Loss Per Share

Loss Per Share	9 Months Ended
	Sep. 30, 2021
Earnings Per Share [Abstract]
Loss Per Share	Note 4. Loss Per Share The Company presents basic and diluted loss per common share amounts. Basic loss per common share is calculated by dividing net loss available to common stockholders by the weighted average number of common shares outstanding during the applicable period. Diluted loss per common share is calculated by dividing net loss available to common stockholders by the weighted average number of common shares and common share equivalents outstanding during the applicable period. As the Company incurred a net loss during each of the three months and nine months ended September 30, 2021 and 2020, basic average common shares outstanding and diluted average common shares outstanding were the same because the effect of potential shares of common stock, including stock options (436,973 – 2021 and 654,617 – 2020) and unvested restricted stock issued (182,011 – 2021 and 199,391 – 2020), was anti-dilutive. The information used to compute basic and diluted net loss per common share was as follows for the periods indicated: Three Months Ended Nine Months Ended September 30, September 30, 2021 2020 2021 2020 Net loss $ (4,907 ) $ (3,273 ) $ (16,621 ) $ (10,944 ) Weighted average shares outstanding (basic and diluted) 22,096,704 17,596,076 21,727,561 16,812,806 Net loss per common share: Basic $ (0.22 ) $ (0.19 ) $ (0.76 ) $ (0.65 ) Diluted $ (0.22 ) $ (0.19 ) $ (0.76 ) $ (0.65 )

Revenue

Revenue	9 Months Ended
	Sep. 30, 2021
Revenue From Contract With Customer [Abstract]
Revenue	Note 5. Revenue The Company derives revenue from the sale of 3D printing machines and 3D printed and other products, materials and services. Revenue is recognized when the Company satisfies its performance obligation(s) under a contract (either implicit or explicit) by transferring the promised product or service to a customer, which is when (or as) the customer obtains control of the product or service. A performance obligation is a promise in a contract to transfer a distinct product or service to a customer. A contract’s transaction price is allocated to each distinct performance obligation. Revenue is measured as the amount of consideration the Company expects to receive in exchange for transferring products or providing services. As such, revenue is recorded net of returns, allowances, customer discounts, and incentives. Sales, value add, and other taxes collected from customers and remitted to governmental authorities are accounted for on a net (excluded from revenue) basis. Shipping and handling costs are included in cost of sales. Certain of the Company’s contracts with customers contain multiple performance obligations. Sales of 3D printing machines may also include optional equipment, materials, replacement components and services (installation, training and other services, including maintenance services and/or an extended warranty). Certain other contracts have a single performance obligation, as the promise to transfer products or services is not separately identifiable from other promises in the contract and, therefore, not distinct. For contracts with multiple performance obligations, the Company allocates the contract’s transaction price to each performance obligation using the Company’s best estimate of stand-alone selling price for each distinct product or service in the contract, which is generally based on an observable price. When the Company sells products to customers, revenue is recognized at a point in time. The Company’s contracts for 3D printing machines generally include substantive customer acceptance provisions. Revenue under these contracts is recognized when customer acceptance provisions have been satisfied. For all other product sales, the Company recognizes revenue at the point in time in which the customer obtains control of the product, which is generally when product title passes to the customer upon delivery. In certain cases, title does not transfer and revenue is not recognized until the customer has received the products at its physical location. The Company’s revenue from service arrangements includes deferred maintenance contracts and extended warranties that can be purchased at the customer’s option. The Company generally provides a standard one-year warranty on the Company’s 3D printing machines, which is considered an assurance type warranty, and not considered a separate performance obligation (Note 8). Revenue associated with deferred maintenance contracts is generally recognized at a point in time when the related services are performed where sufficient historical evidence indicates that the costs of performing the related services under the contract are not incurred on a straight-line basis, with such revenue recognized in proportion to the costs expected to be incurred. Revenue associated with extended warranties is generally recognized over time on a straight-line basis over the related contract period. The Company generates certain revenues through the sale of research and development services. Revenue under research and development service contracts is generally recognized over time where progress is measured in a manner that reflects the transfer of control of the promised goods or services to the customer. Depending on the facts and circumstances surrounding each research and development service contract, revenue is recognized over time using either an input measure (based on the entity’s direct costs incurred in an effort to satisfy the performance obligations) or an output measure (specifically units or parts delivered, based upon certain customer acceptance and delivery requirements). A portion of the Company’s service revenue is generated through contracts with the federal government under fixed-fee, cost reimbursable and time and materials arrangements (certain of which may have periods of performance greater than one year). Revenue under these contracts is generally recognized over time using an input measure based upon direct costs incurred. The following table summarizes the Company’s revenue by product group for the periods indicated: Three Months Ended Nine Months Ended September 30, September 30, 2021 2020 2021 2020 3D printing machines $ 10,792 $ 10,488 $ 26,200 $ 21,703 3D printed and other products, materials and services 8,251 6,911 24,646 20,178 $ 19,043 $ 17,399 $ 50,846 $ 41,881 The timing of revenue recognition, billings and cash collections results in billed receivables, unbilled receivables (contract assets) and deferred revenue and customer prepayments (contract liabilities) in the accompanying condensed consolidated balance sheet. The Company considers a number of factors in its evaluation of the creditworthiness of its customers, including past due amounts, past payment history, and current 30 to 60 days recognizes For the nine months ended September 30, 2021, the Company recognized revenue of $9,361 related to contract liabilities at January 1, 2021. There As of September 30, 2021, the notwithstanding uncertainty related to the impact of COVID-19 (Note 1) including, but not limited to, international shipping and travel restrictions brought about by COVID-19, which could have an adverse effect on the timing of delivery and installation of products and/or services to customers The Company has elected to apply the practical expedient associated with incremental costs of obtaining a contract, and as such, sales commission expense is generally Accounts receivable and net investment in sales-type leases are reported at their net realizable value. The Company carries its investment in sales-type leases based on discounting the minimum lease payments by the interest rate implicit in the lease, less an allowance for doubtful accounts. The Company’s estimate of the allowance for doubtful accounts related to accounts receivable and net investment in sales-type leases is based on the Company’s evaluation of customer accounts with past-due outstanding balances or specific accounts for which it has information that the customer may be unable to meet its financial obligations. Based upon review of these accounts, and management’s analysis and judgment, the Company records a specific allowance for that customer’s accounts receivable or net investment in sales-type lease balance to reduce the outstanding balance to the amount expected to be collected. The allowance is re-evaluated and adjusted periodically as additional information is received that impacts the allowance amount reserved. At September 30, 2021 and December 31, 2020 , the allowance for doubtful accounts was $529 and $576 , respectively. During the three months ended September 30, 2021 and 2020 , the Company recorded net provision for bad debts of $15 and $15 , respectively. During the nine months ended September 30, 2021 and 2020 , the Company recorded net recoveries for bad debts of $ 38 and $ 4 , respectively.

Cash, Cash Equivalents, and Res

Cash, Cash Equivalents, and Restricted Cash	9 Months Ended
	Sep. 30, 2021
Cash And Cash Equivalents [Abstract]
Cash, Cash Equivalents, and Restricted Cash	Note 6. Cash, Cash Equivalents, and Restricted Cash The following provides a reconciliation of cash, cash equivalents, and restricted cash as reported in the accompanying condensed consolidated balance sheet to the same such amounts shown in the accompanying condensed statement of consolidated cash flows as of the dates indicated: September 30, December 31, 2021 2020 Cash and cash equivalents $ 122,809 $ 49,668 Restricted cash 1,870 508 Cash, cash equivalents, and restricted cash $ 124,679 $ 50,176 Restricted cash at September 30, 2021 included $1,270 Restricted cash at December 31, 2020 included $508 of 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 above are considered legally restricted by the Company.

Inventories

Inventories	9 Months Ended
	Sep. 30, 2021
Inventory Disclosure [Abstract]
Inventories	Note 7. Inventories Inventories consisted of the following as of the dates indicated: September 30, December 31, 2021 2020 Raw materials and components $ 14,728 $ 9,436 Work in process 5,481 4,797 Finished goods 4,869 6,329 $ 25,078 $ 20,562 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, 2021 and December 31, 2020, the allowance for slow-moving and obsolete inventories was $2,870 and $2,678, respectively, and has been reflected as a reduction to inventories (principally raw materials and components). The following table summarizes changes in the allowance for slow-moving and obsolete inventories for the periods indicated: Three Months Ended Nine Months Ended September 30, September 30, 2021 2020 2021 2020 Balance at beginning of period $ 2,813 $ 2,493 $ 2,678 $ 3,443 Provision for slow-moving and obsolete inventories ̶ net 160 30 378 130 Reductions for sale, consumption or scrap of previously reserved amounts (42 ) (55 ) (50 ) (1,110 ) Foreign currency translation adjustments (61 ) 94 (136 ) 99 Balance at end of period $ 2,870 $ 2,562 $ 2,870 $ 2,562 Reductions for sale, consumption or scrap of previously reserved amounts for the nine months ended September 30, 2020 consisted principally of certain raw material and component inventories associated with the Company’s former Exerial 3D printing platform, which were disposed of during the period. There was no significant benefit or charge recorded during the nine months ended September 30, 2020 in connection with the related disposals. During the nine months ended September 30, 2020, the Company recorded a charge of $205 to cost of sales in the accompanying condensed statement of consolidated operations and comprehensive loss associated with certain inventories for which cost was determined to exceed net realizable value.

Product Warranty Reserves

Product Warranty Reserves	9 Months Ended
	Sep. 30, 2021
Product Warranties Disclosures [Abstract]
Product Warranty Reserves	Note 8. Product Warranty Reserves Substantially all of the Company’s 3D printing machines are covered by a standard one-year 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 the associated product warranty reserves is recorded to cost of sales in the period that such a determination is made. At September 30, 2021 and December 31, 2020, the product warranty reserves balance was $1,011 and $1,335, respectively, and has been reflected in accrued expense and other current liabilities in the accompanying condensed consolidated balance sheet. The following table summarizes changes in the product warranty reserves balance for the periods indicated: Three Months Ended Nine Months Ended September 30, September 30, 2021 2020 2021 2020 Balance at beginning of period $ 1,100 $ 603 $ 1,335 $ 866 Provisions for new issuances 422 391 1,313 854 Payments (373 ) (561 ) (1,769 ) (1,406 ) Reserve adjustments (126 ) 607 167 728 Foreign currency translation adjustments (12 ) 25 (35 ) 23 Balance at end of period $ 1,011 $ 1,065 $ 1,011 $ 1,065

Contingencies and Commitments

Contingencies and Commitments	9 Months Ended
	Sep. 30, 2021
Commitments And Contingencies Disclosure [Abstract]
Contingencies and Commitments	Note 9. Contingencies and Commitments Contingencies On March 1, 2018, the Company’s ExOne GmbH subsidiary notified Voxeljet AG that it had materially breached a 2003 Patent and Know-How Transfer Agreement and asserted its rights to set-off damages as a result of the breaches against the annual license fee due from the Company under the agreement. At this time, the Company cannot reasonably estimate a contingency, if any, related to this matter. The Company is subject to various litigation, claims, and proceedings which have been or may be instituted or asserted from time to time in the ordinary course of business. Management does not believe that the outcome of any pending or threatened matters will have a material adverse effect, individually or in the aggregate, on the financial position, results of operations or cash flows of the Company. Commitments In the normal course of its operations, ExOne GmbH issues short-term financial guarantees and letters of credit to third parties in connection with certain commercial transactions requiring security through a credit facility with a German bank. The credit facility provides a capacity amount of $4,057 (€3,500) for the issuance of financial guarantees and letters of credit for commercial transactions requiring security. The credit facility does not require cash collateral for the issuance of financial guarantees and letters of credit for commercial transactions requiring security for amounts up to $1,159 (€1,000). Amounts in excess of $1,159 (€1,000) require cash collateral under the credit facility. At September 30, 2021, total outstanding financial guarantees and letters of credit issued by ExOne GmbH under the credit facility were $2,429 ( €2,096 November 2021 March 2023 €1,096

Related Party Revolving Credit

Related Party Revolving Credit Facility	9 Months Ended
	Sep. 30, 2021
Related Party Transactions [Abstract]
Related Party Revolving Credit Facility	Note 10. Related Party Revolving Credit Facility On March 12, 2018, the Company and its ExOne Americas LLC and ExOne GmbH subsidiaries, as guarantors (collectively, the “Loan Parties”), entered into a Credit Agreement and related ancillary agreements with LBM Holdings, LLC (“LBM”), a company controlled by S. Kent Rockwell, who was the Executive Chairman of the Company (a related party) at such date and is currently Chairman of the Company, relating to a $15,000 revolving credit facility (the “Credit Agreement”) to provide additional funding to the Company for working capital and general corporate purposes. The Credit Agreement provided a credit facility for a term of three years (through March 12, 2021), bearing interest at a rate of one-month LIBOR plus an applicable margin of 500 basis points. The Credit Agreement required a commitment fee of 75 basis points, or 0.75%, on the unused portion of the facility, payable monthly in arrears. In addition, an up-front commitment fee of 125 basis points, or 1.25% ($188), was required at closing. Borrowings under the Credit Agreement were collateralized by the accounts receivable, inventories and machinery and equipment of the Loan Parties. On February 18, 2020, the Loan Parties and LBM entered into a First Amendment to the Credit Agreement (the “Amendment”) which (i) reduced the available capacity under the revolving credit facility to $10,000, (ii) extended the term of the credit facility until March 31, 2024, (iii) increased the commitment fee to 100 basis points, or 1.00%, on the unused portion of the revolving credit facility, and (iv) provided a process for the replacement of the LIBOR index after 2021. In addition, the accounts receivable of ExOne GmbH no longer served as collateral for borrowings under the amended revolving credit facility. Under the terms of the amended credit facility, the Company could make prepayments against outstanding borrowings, reduce the credit commitment or terminate the credit commitment at any time without penalty. The Company incurred $265 in debt issuance costs associated with the inception of the credit facility (including the aforementioned up-front commitment fee paid at closing to LBM) and $49 in debt issuance costs associated with the Amendment. On March 5, 2021, the Company terminated the related party revolving credit facility. There were no penalties associated with the Company’s termination of the credit facility. Due to the termination, the Company accelerated the amortization of the remaining debt issuance costs associated with the credit facility, resulting in recognition of a $105 loss on the extinguishment of debt during the three months ended March 31, 2021. During the three months ended March 31, 2021, the Company recorded interest expense related to the credit facility of $129, comprised of the aforementioned $105 loss on extinguishment of debt, $18 associated with the commitment fee on the unused portion of the revolving credit facility and $6 associated with the amortization of debt issuance costs. As the credit facility was terminated in March 2021, there was no interest expense related to the credit facility recognized subsequent to the three months ended March 31, 2021. There were no borrowings under the credit facility during 2021 prior to its termination. During the three months and nine months ended September 30, 2020, the Company recorded interest expense related to the credit facility of $34 and $113, respectively. Included in interest expense for the three months and nine months ended September 30, 2020 was $8 and $35, respectively, associated with amortization of debt issuance costs, and $26 and $78, respectively, associated with the commitment fee on the unused portion of the revolving credit facility. There were no borrowings under the credit facility during the three or nine months ended September 30, 2020.

Long-Term Debt

Long-Term Debt	9 Months Ended
	Sep. 30, 2021
Debt Disclosure [Abstract]
Long Term Debt	Note 11. Long-Term Debt Long-term debt consisted of the following as of the dates indicated: September 30, 2021 December 31, 2020 Principal Unamortized Debt Issuance Costs Net Principal Unamortized Debt Issuance Costs Net Paycheck Protection Program loan $ — $ — $ — $ 2,194 $ — $ 2,194 Building note payable — — — 1,226 (15 ) 1,211 Less: Amount due within one year — — — (1,626 ) 4 (1,622 ) $ — $ — $ — $ 1,794 $ (11 ) $ 1,783 Paycheck Protection Program Loan On April 18, 2020, the Company entered into an unsecured promissory note (the “Note”) with an unrelated United States bank (the “Lender”) reflecting a loan in the principal amount of $2,194 (the “Loan”). The Loan was granted pursuant to the Paycheck Protection Program (the “PPP”) administered by the United States Small Business Administration (the “SBA”) as part of the Coronavirus Aid, Relief, and Economic Security Act (the “CARES Act”). Pursuant to the terms of the Note, the Loan bore interest at a rate of 1.00% per annum and matured on April 18, 2022 (the “Maturity Date”). Under the terms of the Note, principal and interest payments on the Loan were deferred until November 18, 2020, at which time equal installments of principal and interest would have been due and payable monthly through the Maturity Date. Subsequent to the Company entering into the Note, in June 2020, the Paycheck Protection Program Flexibility Act of 2020 was enacted, which extended the deferral of principal and interest payments on the Loan from November 2020 to August 2021. Pursuant to the terms of the PPP, the Loan, or a portion thereof, could be forgiven if Loan proceeds were used for qualifying expenses as described in the CARES Act, such as payroll costs, costs used to continue group health care benefits, mortgage interest payments, rent and utilities. The Company used all of the Loan proceeds for qualifying expenses. During June 2021, the Company submitted an application to the SBA requesting full forgiveness of the Loan. On July 8, 2021, the Company received notice from the SBA that the Loan had been forgiven in full, including forgiveness of all interest accrued to date. This formal notice from the SBA legally released the Company of any obligations under the Loan. As a result, the Company recognized a gain on extinguishment of the PPP loan of $2,220 during the three months ended September 30, 2021. The total gain on extinguishment of debt of $2,220 was comprised of $2,194 related to the forgiveness of principal and $26 related to the forgiveness of accrued interest. Building Note Payable On May 21, 2012, the Company entered into a building note payable with an unrelated United States bank. Terms of the building note payable included monthly payments of $18, including interest at 4.00% through May 2017, and subsequently, monthly payments of $19 including interest at the monthly average yield on United States Treasury Securities plus 3.25% for the remainder of the term through May 2027. On February 26, 2021, the Company extinguished its building note payable in-full through cash payment of $1,199. The Company did not incur any prepayment penalties related to the extinguishment of the building note payable in advance of the maturity date (May 2027). At the extinguishment date, the net carrying amount of the building note payable was $1,185. As a result, during the three months ended March 31, 2021, the Company recognized a loss on the extinguishment of debt of $14 (included in interest expense in the accompanying condensed statement of consolidated operations and comprehensive loss), which represents the write-off of unamortized debt issuance costs. As the building note payable was terminated in February 2021, there was no interest expense related to the building note payable recognized subsequent to the three months ended March 31, 2021.

Income Taxes

Income Taxes	9 Months Ended
	Sep. 30, 2021
Income Tax Disclosure [Abstract]
Income Taxes	Note 12. Income Taxes The provision (benefit) for income taxes for the three months ended September 30, 2021 and 2020 was $1 and ($34), respectively. The (benefit) provision for income taxes for the nine months ended September 30, 2021 and 2020 was ($410) and $200, respectively. The Company has completed a discrete period computation of its provision (benefit) for income taxes for each of the periods presented. The discrete period computation was required as a result of jurisdictions with losses before income taxes for which no tax benefit can be recognized and an inability to generate reliable estimates for results in certain jurisdictions as a result of inconsistencies in generating net operating profits (losses) in those jurisdictions. The effective tax rate for the three months ended September 30, 2021 and 2020 was 0.0% (provision on a loss) and 1.0% (benefit on a loss), respectively. The effective tax rate for the nine months ended September 30, 2021 and 2020 was 2.4% (benefit on a loss) and 1.9% (provision on a loss), respectively. For the three months ended September 30, 2021 and the three months and nine months ended September 30, 2020, the effective tax rate differed from the United States federal statutory tax rate of 21.0% primarily due to net changes in valuation allowances for the period. For the nine months ended September 30, 2021, the effective tax rate differed from the United States federal statutory rate of 21.0% primarily due to net changes in valuation allowances for the period and recognition of a discrete income tax benefit of $412 related to the carryback of net operating losses in Japan. During the three months ended March 31, 2021, the Company received confirmation from Japanese tax authorities that ExOne KK met the definition of a small or medium-sized enterprise (SME) under Japanese tax regulations, eliminating certain restrictions on the use of net operating losses to offset taxable income. ExOne KK filed amended tax returns related to tax years 2016 through 2019 to carryback net operating losses, resulting in total tax refunds of $412. The Company has provided a valuation allowance for certain of its net deferred tax assets as a result of the Company not generating consistent net operating profits in certain jurisdictions in which it operates. As such, certain benefits from deferred taxes in the periods presented have been fully offset by changes in the valuation allowance for the related 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 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.

Equity-Based Compensation

Equity-Based Compensation	9 Months Ended
	Sep. 30, 2021
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Equity-Based Compensation	Note 13. Equity-Based Compensation On January 24, 2013, the Board adopted the 2013 Equity Incentive Plan (the “Plan”). In connection with the adoption of the Plan, 500,000 shares of common stock were reserved for issuance pursuant to the Plan, with automatic increases in such reserve available each year annually on January 1 from 2014 through 2023 equal to the lesser of 3.0% of the total outstanding shares of common stock as of December 31 of the immediately preceding year, or a number of shares of common stock determined by the Board, provided that the maximum number of shares authorized under the Plan could not exceed 1,992,241 shares, subject to certain adjustments. The maximum number of shares authorized under the Plan was reached on January 1, 2017. At September 30, 2021, 412,404 shares remained available for future issuance under the Plan Stock options and restricted stock issued by the Company under the Plan are generally subject to service conditions resulting in annual vesting on the anniversary of the date of grant over a period typically ranging between one and three years. Certain equity-based compensation awards issued by the Company under the Plan vest immediately upon issuance. Stock options issued by the Company under the Plan have contractual lives which expire over a period typically ranging between five and ten years from the date of grant, subject to continued service to the Company by the participant . On February 5, 2020, the Compensation Committee of the Board adopted the 2020 Annual Incentive Program (the “2020 Program”) as a subplan under the Plan. The 2020 Program provided an opportunity for performance-based compensation to senior executive officers of the Company, among others. The target annual incentive for each 2020 Program participant was expressed as a percentage of base salary and was conditioned on the achievement of certain financial goals (as approved by the Compensation Committee of the Board). The Compensation Committee of the Board retained negative discretion over amounts payable under the 2020 Program. During the three months and nine months ended September 30, 2020, the Company recorded no equity-based compensation expense based on the estimated outcome of the defined financial goals for 2020 under the 2020 Program. On February 2, 2021, the Compensation Committee of the Board adopted the 2021 Annual Incentive Program (the “2021 Program”) as a subplan under the Plan. The 2021 Program provided an opportunity for performance-based compensation to senior executive officers of the Company, among others. The target annual incentive for each 2021 Program participant was expressed as a percentage of base salary and was conditioned on the achievement of certain financial and/or individual performance goals (as approved by the Compensation Committee of the Board). The Compensation Committee of the Board retained negative discretion over amounts payable under the 2021 Program. During the three months and nine months ended September 30, 2021, the Company recorded $24 and $69, respectively, in equity-based compensation expense based on the estimated outcome of the defined financial and individual goals for 2021 under the 2021 Program. On February 2, 2021, the Compensation Committee of the Board adopted the 2021 Executive Stock Performance Program (the “ESPP”) as a subplan under the Plan. The ESPP provided an opportunity for senior executive officers of the Company to earn performance-based compensation based on the performance of the Company’s common stock over a one-year period ending December 31, 2021. During the three months and nine months ended September 30, 2021, the Company recorded $21 and $56, respectively, in equity-based compensation expense based on the estimated fair value of the equity-based compensation awards expected to be granted under the ESPP. The following table summarizes the total equity-based compensation expense recognized by the Company for the periods indicated: Three Months Ended Nine Months Ended September 30, September 30, 2021 2020 2021 2020 Equity-based compensation expense recognized: Stock options $ 57 $ 127 $ 242 $ 316 Restricted stock 338 244 697 490 Other (a) 55 8 169 22 Total equity-based compensation expense before income taxes 450 379 1,108 828 Benefit for income taxes (b) — — — — Total equity-based compensation expense net of income taxes $ 450 $ 379 $ 1,108 $ 828 (a) For both the three months and nine months ended September 30, 2021, Other represents expense associated with the 2021 Program, the ESPP, and certain employee contractual amounts to be settled in equity. For the nine months ended September 30, 2021, Other also includes expense associated with unrestricted stock issued to a non-employee director. For each of the 2020 periods, Other represents expense associated with certain employee contractual amounts to be settled in equity. (b) The Benefit for income taxes from equity-based compensation for each of the periods presented has been determined to be $0 based on recorded valuation allowances against net deferred tax assets. At September 30, 2021, total future compensation expense related to unvested awards yet to be recognized by the Company was $137 for stock options and $2,460 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 0.9 years. The fair value of stock options granted was estimated on the date of grant using the Black-Scholes option pricing model with the following assumptions for the periods indicated: Nine Months Ended September 30, 2021 2020 Weighted average fair value per stock option $19.04 $5.11 - $6.20 Volatility 71.1% 58.0% - 58.6% Average risk-free interest rate 0.5% 0.2% Dividend yield 0.0% 0.0% Expected term (years) 3.5 3.5 Volatility is estimated based on the historical volatility of the Company’s stock price consistent with the expected term of the awards. The average risk-free rate is based on a weighted average yield curve of risk-free interest rates consistent with the expected term of the awards. Expected dividend yield is based on historical dividend data as well as future expectations. Expected term is calculated using the simplified method as the Company does not have sufficient historical exercise experience upon which to base an estimate. The activity for stock options was as follows for the periods indicated: Nine Months Ended September 30, 2021 2020 Number Options Weighted Exercise Price Weighted Average Grant Date Fair Value Number Options Weighted Exercise Price Weighted Average Grant Date Fair Value Outstanding at beginning of period 641,232 $ 9.80 $ 4.74 854,259 $ 9.34 $ 4.49 Stock options granted 4,500 $ 38.22 $ 19.04 25,022 $ 14.40 $ 5.99 Stock options exercised (208,259 ) $ 11.81 $ 6.45 (117,854 ) $ 7.28 $ 3.12 Stock options forfeited (500 ) $ 7.11 $ 2.77 (79,936 ) $ 7.85 $ 3.41 Stock options expired — $ — $ — (26,874 ) $ 12.02 $ 6.78 Outstanding at end of period 436,973 $ 9.14 $ 4.07 654,617 $ 9.81 $ 4.75 Exercisable at end of period 409,591 $ 8.81 $ 3.92 506,295 $ 10.46 $ 5.27 Expected to vest at end of period 27,382 $ 14.05 $ 6.29 148,322 $ 7.62 $ 3.01 At September 30, 2021, intrinsic value associated with stock options exercisable and expected to vest was $5,966 and $322, respectively. The weighted average remaining contractual term of stock options exercisable and expected to vest at September 30, 2021, was 2.3 years and 3.6 years, respectively. Stock options with an aggregate intrinsic value of $5,906 were exercised by employees during the nine months ended September 30, 2021, resulting in proceeds to the Company from the exercise of stock options of $2,460. Stock options with an aggregate intrinsic value of $1,096 were exercised by employees during the nine months ended September 30, 2020, resulting in proceeds to the Company from the exercise of stock options of $858. The Company recorded no income tax benefit related to these exercises. The activity for restricted stock was as follows for the periods indicated: Nine Months Ended September 30, 2021 2020 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 188,891 $ 9.52 66,513 $ 8.76 Restricted stock granted 81,083 $ 22.12 209,891 $ 9.58 Restricted stock vested (87,963 ) $ 8.84 (77,013 ) $ 8.94 Restricted stock forfeited — $ — — $ — Outstanding at end of period 182,011 $ 15.47 199,391 $ 9.55 Restricted stock expected to vest at end of period 182,011 $ 15.47 199,391 $ 9.55 Restricted stock that vested during the nine months ended September 30, 2021 and 2020, had a fair value of $2,424 and $635, respectively. Participants have the option to elect net settlement for restricted stock awards. Under net settlement, the Company withholds shares of stock that would otherwise be delivered to the employee and remits cash equal to the fair value of shares withheld to the taxing authority to satisfy tax withholding obligations. During the nine months ended September 30, 2021 and 2020, the Company withheld shares with a fair value of $7 and $15, respectively, related to the net settlement of restricted stock awards.

Concentration of Credit Risk

Concentration of Credit Risk	9 Months Ended
	Sep. 30, 2021
Risks And Uncertainties [Abstract]
Concentration of Credit Risk	Note 14. Concentration of Credit Risk During the three months and nine months ended September 30, 2021 and 2020, the Company conducted a significant portion of its business with a limited number of customers, though not necessarily the same customers for each respective period. For the three months ended September 30, 2021 and 2020, the Company’s five most significant customers represented 33.3% and 39.5% of total revenue, respectively. For the nine months ended September 30, 2021 and 2020, the Company’s five most significant customers represented 18.7% and 20.0% of total revenue, respectively. At September 30, 2021 and December 31, 2020, accounts receivable from the Company’s five most significant customers were $3,175 and $1,633, respectively.

Other (Income) Expense - Net

Other (Income) Expense - Net	9 Months Ended
	Sep. 30, 2021
Other Income And Expenses [Abstract]
Other (Income) Expense - Net	Note 15. Other (Income) Expense – Net Other (income) expense – net consisted of the following for the periods indicated: Three Months Ended Nine Months Ended September 30, September 30, 2021 2020 2021 2020 Interest income $ (8 ) $ (4 ) $ (14 ) $ (19 ) Foreign currency (gains) losses - net (36 ) 299 112 262 Other – net (4 ) 19 (35 ) 76 $ (48 ) $ 314 $ 63 $ 319

Subsequent Events

Subsequent Events	9 Months Ended
	Sep. 30, 2021
Subsequent Events [Abstract]
Subsequent Events	Note 16. Subsequent Events The Company has evaluated all of its activities and concluded that no other 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, 2021
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, and its wholly-owned subsidiaries, ExOne Americas LLC (United States); ExOne GmbH (Germany); ExOne Property GmbH (Germany); and ExOne KK (Japan). Collectively, the consolidated group is referred to as the “Company”. 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, 2020 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, 2020, 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; revenue (including the allocation of a sales contract’s total transaction price to each performance obligation for contracts with multiple performance obligations); and equity-based compensation (including the valuation of certain equity-based compensation awards issued by the Company). 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.
Merger Transaction	Merger Transaction On August 11, 2021, the Company entered into an Agreement and Plan of Merger (the “Merger Agreement”) with Desktop Metal, Inc., a Delaware corporation (“DM”), Texas Merger Sub I, Inc., a Delaware corporation and wholly-owned subsidiary of DM (“Merger Sub I”) and Texas Merger Sub II, LLC, a Delaware limited liability company and wholly-owned subsidiary of DM (“Merger Sub II”). Upon the terms and subject to the conditions set forth in the Merger Agreement, Merger Sub I will merge with and into the Company, with the Company surviving the merger as a wholly owned subsidiary of DM (the “First Merger”) and immediately thereafter, the Company will merge with and into Merger Sub II, with Merger Sub II surviving the subsequent merger (the “Second Merger”, and, together with the First Merger, the “Mergers”). Subject to the terms and conditions of the Merger Agreement, stockholders of the Company will receive, in exchange for each share of our common stock held immediately prior to the Mergers, (i) $8.50 in cash and (ii) a number of shares of DM common stock, equal to the Exchange Ratio (defined below). The “Exchange Ratio” shall be determined based on DM’s 20-day average closing stock price three trading days prior to closing: (i) if the average closing DM stock price is greater than or equal to $9.70, then the Exchange Ratio shall be set at 1.7522; (ii) if the average closing DM stock price is less than or equal to $7.94, then the Exchange Ratio shall be set at 2.1416; (iii) if the average closing DM stock price is less than $9.70 but greater than $7.94, then the Exchange Ratio shall be equal to 1.9274 multiplied by the quotient of (x) $8.82 divided by (y) the average closing DM stock price. On October 20, 2021, the Company and DM received clearance from the German Federal Ministry for Economic Affairs and Energy, a foreign investment regulatory authority, that the transactions contemplated by the Merger Agreement have been cleared pursuant to section 58a paragraph 1 of the German Foreign Trade and Payments Ordinance. Additionally, the waiting period under the Hart-Scott-Rodino Antitrust Improvements Act of 1976, as amended, expired on October 28, 2021 at 11:59 p.m. Eastern Time. Accordingly, the Company and DM have now received all regulatory approvals required as a condition to consummate the Mergers. On November 9, 2021, the Company held a special meeting of stockholders. At that special meeting, the ExOne stockholders voted to approve the Merger Agreement. Pursuant to the Merger Agreement, the proposed transaction may close as soon as three business days following the date of the special meeting of ExOne stockholders, subject to customary closing conditions. During the three months and nine months ended September 30, 2021, the Company incurred expenses associated with the planned merger transaction of $3,376 and $3,477, respectively, all of which are included in selling, general and administrative expenses in the accompanying condensed statement of consolidated operations and comprehensive loss.
COVID-19	COVID-19 In March 2020, the World Health Organization declared the novel strain of coronavirus a global pandemic (“COVID-19”) and recommended containment and mitigation measures worldwide. The impact of COVID-19 and the related economic, business and market disruptions were wide-ranging and continue to be significant. As a result of COVID-19, the Company was required to temporarily close its operations at its North Huntingdon, Pennsylvania facility for the period from March 23 through March 30, 2020. In response to COVID-19, the Company has incurred incremental costs associated with protecting the health and safety of the Company’s global workforce, enhanced sanitization of the Company’s global operating facilities, and information technology capabilities for employees operating remotely. Beginning in March 2020, restrictions imposed by various governmental authorities on both domestic and international shipping and travel have caused disruptions to the timing of delivery and installation of the Company’s three-dimensional (“3D”) printing machines, resulting in negative impacts to the Company’s financial position, results of operations and cash flows. The duration and severity of the outbreak and its long-term impact on the Company’s business remain uncertain. The Company is unable to predict the impact that COVID-19 will have on its future financial position, results of operations and cash flows.
Recently Issued Accounting Guidance	Recently Issued Accounting Guidance The Company considers the applicability and impact of all Accounting Standards Updates (“ASUs”) issued by the Financial Accounting Standards Board (the “FASB”). Recently issued ASUs not listed below either were assessed and determined to be not applicable or are currently expected to have no impact on the consolidated financial statements of the Company. In May 2021, the FASB issued ASU 2021-04, “Issuer’s Accounting for Certain Modifications or Exchanges of Freestanding Equity-Classified Written Call Options”. This ASU clarifies the accounting treatment for freestanding equity-classified written call options that are modified or exchanged as part of or directly related to a modification or an exchange of existing debt. This ASU becomes effective for the Company on January 1, 2022. Early adoption is permitted. This guidance would only be applicable to the consolidated financial statements of the Company in the event that freestanding equity-classified written call options were modified or exchanged as a part of or directly related to the modification or exchange of existing debt. As no such transactions have occurred during the current year and no such transactions are anticipated, management determined that the adoption of this ASU will not have an impact on the consolidated financial statements of the Company. In June 2016, the FASB issued ASU 2016-13, “Financial Instruments – Credit Losses.” This ASU added a new impairment model (known as the current expected credit loss (“CECL”) model) that is based on expected losses rather than incurred losses. Under the new guidance, an entity recognizes as an allowance its estimate of expected credit losses. The CECL model applies to most debt instruments, trade receivables, lease receivables, financial guarantee contracts, and other loan commitments. The CECL model does not have a minimum threshold for recognition of impairment losses and entities will need to measure expected credit losses on assets that have a low risk of loss. As a smaller reporting company pursuant to Rule 12b-2 of the Securities Exchange Act of 1934, as amended, these changes become effective for the Company on January 1, 2023. Management is currently evaluating the potential impact of these changes on the consolidated financial statements of the Company.
Loss Per Share	The Company presents basic and diluted loss per common share amounts. Basic loss per common share is calculated by dividing net loss available to common stockholders by the weighted average number of common shares outstanding during the applicable period. Diluted loss per common share is calculated by dividing net loss available to common stockholders by the weighted average number of common shares and common share equivalents outstanding during the applicable period.
Revenue	The Company derives revenue from the sale of 3D printing machines and 3D printed and other products, materials and services. Revenue is recognized when the Company satisfies its performance obligation(s) under a contract (either implicit or explicit) by transferring the promised product or service to a customer, which is when (or as) the customer obtains control of the product or service. A performance obligation is a promise in a contract to transfer a distinct product or service to a customer. A contract’s transaction price is allocated to each distinct performance obligation. Revenue is measured as the amount of consideration the Company expects to receive in exchange for transferring products or providing services. As such, revenue is recorded net of returns, allowances, customer discounts, and incentives. Sales, value add, and other taxes collected from customers and remitted to governmental authorities are accounted for on a net (excluded from revenue) basis. Shipping and handling costs are included in cost of sales. Certain of the Company’s contracts with customers contain multiple performance obligations. Sales of 3D printing machines may also include optional equipment, materials, replacement components and services (installation, training and other services, including maintenance services and/or an extended warranty). Certain other contracts have a single performance obligation, as the promise to transfer products or services is not separately identifiable from other promises in the contract and, therefore, not distinct. For contracts with multiple performance obligations, the Company allocates the contract’s transaction price to each performance obligation using the Company’s best estimate of stand-alone selling price for each distinct product or service in the contract, which is generally based on an observable price.

Accumulated Other Comprehensi_2

Accumulated Other Comprehensive Loss (Tables)	9 Months Ended
	Sep. 30, 2021
Equity [Abstract]
Summary of Changes in the Components of Accumulated Other Comprehensive Loss	The following table summarizes changes in the components of accumulated other comprehensive loss for the periods indicated: Three Months Ended Nine Months Ended September 30, September 30, 2021 2020 2021 2020 Foreign currency translation adjustments Balance at beginning of period $ (11,035 ) $ (11,951 ) $ (10,138 ) $ (11,483 ) Other comprehensive (loss) income (465 ) 856 (1,362 ) 388 Balance at end of period $ (11,500 ) $ (11,095 ) $ (11,500 ) $ (11,095 )

Loss Per Share (Tables)

Loss Per Share (Tables)	9 Months Ended
	Sep. 30, 2021
Earnings Per Share [Abstract]
Computation of Basic and Diluted Loss Per Common Share	The information used to compute basic and diluted net loss per common share was as follows for the periods indicated: Three Months Ended Nine Months Ended September 30, September 30, 2021 2020 2021 2020 Net loss $ (4,907 ) $ (3,273 ) $ (16,621 ) $ (10,944 ) Weighted average shares outstanding (basic and diluted) 22,096,704 17,596,076 21,727,561 16,812,806 Net loss per common share: Basic $ (0.22 ) $ (0.19 ) $ (0.76 ) $ (0.65 ) Diluted $ (0.22 ) $ (0.19 ) $ (0.76 ) $ (0.65 )

Revenue (Tables)

Revenue (Tables)	9 Months Ended
	Sep. 30, 2021
Revenue From Contract With Customer [Abstract]
Summary of Revenue by Product Group	The following table summarizes the Company’s revenue by product group for the periods indicated: Three Months Ended Nine Months Ended September 30, September 30, 2021 2020 2021 2020 3D printing machines $ 10,792 $ 10,488 $ 26,200 $ 21,703 3D printed and other products, materials and services 8,251 6,911 24,646 20,178 $ 19,043 $ 17,399 $ 50,846 $ 41,881

Cash, Cash Equivalents, and R_2

Cash, Cash Equivalents, and Restricted Cash (Tables)	9 Months Ended
	Sep. 30, 2021
Cash And Cash Equivalents [Abstract]
Schedule of Reconciliation of Cash, Cash Equivalents and Restricted Cash	The following provides a reconciliation of cash, cash equivalents, and restricted cash as reported in the accompanying condensed consolidated balance sheet to the same such amounts shown in the accompanying condensed statement of consolidated cash flows as of the dates indicated: September 30, December 31, 2021 2020 Cash and cash equivalents $ 122,809 $ 49,668 Restricted cash 1,870 508 Cash, cash equivalents, and restricted cash $ 124,679 $ 50,176

Inventories (Tables)

Inventories (Tables)	9 Months Ended
	Sep. 30, 2021
Inventory Disclosure [Abstract]
Schedule of Inventories	Inventories consisted of the following as of the dates indicated: September 30, December 31, 2021 2020 Raw materials and components $ 14,728 $ 9,436 Work in process 5,481 4,797 Finished goods 4,869 6,329 $ 25,078 $ 20,562
Summary of Changes in Allowance for Slow-moving and Obsolete Inventories	The following table summarizes changes in the allowance for slow-moving and obsolete inventories for the periods indicated: Three Months Ended Nine Months Ended September 30, September 30, 2021 2020 2021 2020 Balance at beginning of period $ 2,813 $ 2,493 $ 2,678 $ 3,443 Provision for slow-moving and obsolete inventories ̶ net 160 30 378 130 Reductions for sale, consumption or scrap of previously reserved amounts (42 ) (55 ) (50 ) (1,110 ) Foreign currency translation adjustments (61 ) 94 (136 ) 99 Balance at end of period $ 2,870 $ 2,562 $ 2,870 $ 2,562

Product Warranty Reserves (Tabl

Product Warranty Reserves (Tables)	9 Months Ended
	Sep. 30, 2021
Product Warranties Disclosures [Abstract]
Summary of Changes in Product Warranty Reserves	At September 30, 2021 and December 31, 2020, the product warranty reserves balance was $1,011 and $1,335, respectively, and has been reflected in accrued expense and other current liabilities in the accompanying condensed consolidated balance sheet. The following table summarizes changes in the product warranty reserves balance for the periods indicated: Three Months Ended Nine Months Ended September 30, September 30, 2021 2020 2021 2020 Balance at beginning of period $ 1,100 $ 603 $ 1,335 $ 866 Provisions for new issuances 422 391 1,313 854 Payments (373 ) (561 ) (1,769 ) (1,406 ) Reserve adjustments (126 ) 607 167 728 Foreign currency translation adjustments (12 ) 25 (35 ) 23 Balance at end of period $ 1,011 $ 1,065 $ 1,011 $ 1,065

Long-Term Debt (Tables)

Long-Term Debt (Tables)	9 Months Ended
	Sep. 30, 2021
Debt Disclosure [Abstract]
Components of Long-Term Debt	September 30, 2021 December 31, 2020 Principal Unamortized Debt Issuance Costs Net Principal Unamortized Debt Issuance Costs Net Paycheck Protection Program loan $ — $ — $ — $ 2,194 $ — $ 2,194 Building note payable — — — 1,226 (15 ) 1,211 Less: Amount due within one year — — — (1,626 ) 4 (1,622 ) $ — $ — $ — $ 1,794 $ (11 ) $ 1,783

Equity-Based Compensation (Tabl

Equity-Based Compensation (Tables)	9 Months Ended
	Sep. 30, 2021
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Summary of Equity-Based Compensation Expense	The following table summarizes the total equity-based compensation expense recognized by the Company for the periods indicated: Three Months Ended Nine Months Ended September 30, September 30, 2021 2020 2021 2020 Equity-based compensation expense recognized: Stock options $ 57 $ 127 $ 242 $ 316 Restricted stock 338 244 697 490 Other (a) 55 8 169 22 Total equity-based compensation expense before income taxes 450 379 1,108 828 Benefit for income taxes (b) — — — — Total equity-based compensation expense net of income taxes $ 450 $ 379 $ 1,108 $ 828 (a) For both the three months and nine months ended September 30, 2021, Other represents expense associated with the 2021 Program, the ESPP, and certain employee contractual amounts to be settled in equity. For the nine months ended September 30, 2021, Other also includes expense associated with unrestricted stock issued to a non-employee director. For each of the 2020 periods, Other represents expense associated with certain employee contractual amounts to be settled in equity. (b) The Benefit for income taxes from equity-based compensation for each of the periods presented has been determined to be $0 based on recorded valuation allowances against net deferred tax assets.
Assumptions for Fair Value of Stock Options Granted Estimated on the Date of Grant Using the Black-Scholes Option	The fair value of stock options granted was estimated on the date of grant using the Black-Scholes option pricing model with the following assumptions for the periods indicated:
Summary of Activity for Stock Options	The activity for stock options was as follows for the periods indicated: Nine Months Ended September 30, 2021 2020 Number Options Weighted Exercise Price Weighted Average Grant Date Fair Value Number Options Weighted Exercise Price Weighted Average Grant Date Fair Value Outstanding at beginning of period 641,232 $ 9.80 $ 4.74 854,259 $ 9.34 $ 4.49 Stock options granted 4,500 $ 38.22 $ 19.04 25,022 $ 14.40 $ 5.99 Stock options exercised (208,259 ) $ 11.81 $ 6.45 (117,854 ) $ 7.28 $ 3.12 Stock options forfeited (500 ) $ 7.11 $ 2.77 (79,936 ) $ 7.85 $ 3.41 Stock options expired — $ — $ — (26,874 ) $ 12.02 $ 6.78 Outstanding at end of period 436,973 $ 9.14 $ 4.07 654,617 $ 9.81 $ 4.75 Exercisable at end of period 409,591 $ 8.81 $ 3.92 506,295 $ 10.46 $ 5.27 Expected to vest at end of period 27,382 $ 14.05 $ 6.29 148,322 $ 7.62 $ 3.01
Summary of Activity for Restricted Stock Awards	The activity for restricted stock was as follows for the periods indicated: Nine Months Ended September 30, 2021 2020 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 188,891 $ 9.52 66,513 $ 8.76 Restricted stock granted 81,083 $ 22.12 209,891 $ 9.58 Restricted stock vested (87,963 ) $ 8.84 (77,013 ) $ 8.94 Restricted stock forfeited — $ — — $ — Outstanding at end of period 182,011 $ 15.47 199,391 $ 9.55 Restricted stock expected to vest at end of period 182,011 $ 15.47 199,391 $ 9.55

Other (Income) Expense - Net (T

Other (Income) Expense - Net (Tables)	9 Months Ended
	Sep. 30, 2021
Other Income And Expenses [Abstract]
Schedule of Other (Income) Expense - Net	Other (income) expense – net consisted of the following for the periods indicated: Three Months Ended Nine Months Ended September 30, September 30, 2021 2020 2021 2020 Interest income $ (8 ) $ (4 ) $ (14 ) $ (19 ) Foreign currency (gains) losses - net (36 ) 299 112 262 Other – net (4 ) 19 (35 ) 76 $ (48 ) $ 314 $ 63 $ 319

Basis of Presentation - Additio

Basis of Presentation - Additional Information (Detail) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended	9 Months Ended
	Aug. 11, 2021	Sep. 30, 2021	Sep. 30, 2021
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Entity Incorporation, State or Country Code			DE
Date of incorporation			Jan. 1, 2013
Exchange ratio description	The “Exchange Ratio” shall be determined based on DM’s 20-day average closing stock price three trading days prior to closing: (i) if the average closing DM stock price is greater than or equal to $9.70, then the Exchange Ratio shall be set at 1.7522; (ii) if the average closing DM stock price is less than or equal to $7.94, then the Exchange Ratio shall be set at 2.1416; (iii) if the average closing DM stock price is less than $9.70 but greater than $7.94, then the Exchange Ratio shall be equal to 1.9274 multiplied by the quotient of (x) $8.82 divided by (y) the average closing DM stock price.
Selling, General and Administrative Expenses [Member]
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Merger transaction expenses		$ 3,376	$ 3,477
Merger Agreement [Member]
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Business Acquisition, Equity Interest Issued or Issuable, Description	Subject to the terms and conditions of the Merger Agreement, stockholders of the Company will receive, in exchange for each share of our common stock held immediately prior to the Mergers, (i) $8.50 in cash and (ii) a number of shares of DM common stock, equal to the Exchange Ratio (defined below).

Common Stock Offering - Additio

Common Stock Offering - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended	3 Months Ended	9 Months Ended
	Feb. 28, 2021	Mar. 31, 2021	Sep. 30, 2021	Sep. 30, 2020
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Exercise of employee stock options, shares			208,259	117,854
Sale of common stock	1,872,574
Proceeds from common stock offerings, net of issuance costs	$ 95,725		$ 95,288	$ 27,699
Incurred expenses		$ 266
Equity Distribution Agreement [Member]
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Maximum offering capacity	$ 9,269
Canaccord Equity Distribution Agreement [Member]
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Sale of stock, consideration received on transaction				$ 25,000
Public Offering [Member]
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Issued and sale of common stock	1,666,667
Sale of stock, price per share	$ 54
Additional common stock shares issued	205,907
Underwriting discount and commission per share	$ 2.835
Exercise of employee stock options, shares	205,907

Accumulated Other Comprehensi_3

Accumulated Other Comprehensive Loss - Summary of Changes in the Components of Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Statement Of Income And Comprehensive Income [Abstract]
Balance at beginning of period	$ (11,035)	$ (11,951)	$ (10,138)	$ (11,483)
Foreign currency translation adjustments	(465)	856	(1,362)	388
Balance at end of period	$ (11,500)	$ (11,095)	$ (11,500)	$ (11,095)

Accumulated Other Comprehensi_4

Accumulated Other Comprehensive Loss - Additional Information (Detail) - USD ($)	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Statement Of Income And Comprehensive Income [Abstract]
Accumulated other comprehensive loss, tax	$ 0	$ 0
Amounts reclassified to earnings from accumulated other comprehensive loss	$ 0	$ 0

Loss Per Share - Additional Inf

Loss Per Share - Additional Information (Detail) - shares	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Stock Option [Member]
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Potential shares of anti-dilutive common stock	436,973	654,617	436,973	654,617
Restricted Stock [Member]
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Potential shares of anti-dilutive common stock	182,011	199,391	182,011	199,391

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, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2021	Sep. 30, 2020
Earnings Per Share [Abstract]
Net loss	$ (4,907)	$ (5,574)	$ (6,140)	$ (3,273)	$ (4,023)	$ (3,648)	$ (16,621)	$ (10,944)
Weighted average shares outstanding (basic and diluted)	22,096,704			17,596,076			21,727,561	16,812,806
Net loss per common share:
Basic	$ (0.22)			$ (0.19)			$ (0.76)	$ (0.65)
Diluted	$ (0.22)			$ (0.19)			$ (0.76)	$ (0.65)

Revenue - Summary of Revenue by

Revenue - Summary of Revenue by Product Group (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Revenue from External Customer [Line Items]
Revenue	$ 19,043	$ 17,399	$ 50,846	$ 41,881
3D Printing Machines [Member]
Revenue from External Customer [Line Items]
Revenue	10,792	10,488	26,200	21,703
3D Printed and Other Products, Materials and Services [Member]
Revenue from External Customer [Line Items]
Revenue	$ 8,251	$ 6,911	$ 24,646	$ 20,178

Revenue - Additional Informatio

Revenue - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Disaggregation Of Revenue [Line Items]
Revenue, description of payment terms			the Company’s terms of sale generally require payment within 30 to 60 days after delivery, although the Company also recognizes that longer payment periods are customary in certain countries where it transacts business.
Revenue recognized related to contract liabilities			$ 9,361
Revenue, remaining performance obligation	$ 57,300		57,300
Allowance for doubtful accounts	529		529		$ 576
Recoveries for bad debts - net	$ 15	$ 15	$ (38)	$ (4)
Minimum [Member]
Disaggregation Of Revenue [Line Items]
Term till payment is required from date of shipment			30 days
Maximum [Member]
Disaggregation Of Revenue [Line Items]
Term till payment is required from date of shipment			60 days

Revenue - Additional Informat_2

Revenue - Additional Information (Detail 1) $ in Thousands	Sep. 30, 2021USD ($)
Disaggregation Of Revenue [Line Items]
Revenue, remaining performance obligation	$ 57,300
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-10-01
Disaggregation Of Revenue [Line Items]
Revenue, remaining performance obligation	$ 50,700
Revenue, remaining performance obligation, Expected timing of satisfaction, period	12 months

Cash, Cash Equivalents, and R_3

Cash, Cash Equivalents, and Restricted Cash - Schedule of Reconciliation of Cash, Cash Equivalents, and Restricted Cash (Detail) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Cash And Cash Equivalents [Abstract]
Cash and cash equivalents	$ 122,809	$ 49,668
Restricted cash	1,870	508
Cash, cash equivalents, and restricted cash	$ 124,679	$ 50,176

Cash, Cash Equivalents, and R_4

Cash, Cash Equivalents, and Restricted Cash - Additional Information (Detail) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Cash Cash Equivalents And Restricted Cash [Line Items]
Restricted cash associated with cash collateral	$ 1,870	$ 508
German Bank [Member]
Cash Cash Equivalents And Restricted Cash [Line Items]
Restricted cash associated with cash collateral	1,270
United States Bank [Member]
Cash Cash Equivalents And Restricted Cash [Line Items]
Restricted cash associated with cash collateral	$ 600	$ 508

Inventories - Schedule of Inven

Inventories - Schedule of Inventories (Detail) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Inventory Disclosure [Abstract]
Raw materials and components	$ 14,728	$ 9,436
Work in process	5,481	4,797
Finished goods	4,869	6,329
Inventories	$ 25,078	$ 20,562

Inventories - Additional Inform

Inventories - Additional Information (Detail) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2021	Jun. 30, 2021	Dec. 31, 2020	Jun. 30, 2020	Dec. 31, 2019
Inventory [Line Items]
Allowance for slow-moving and obsolete inventories	$ 2,562	$ 2,870	$ 2,813	$ 2,678	$ 2,493	$ 3,443
Inventories
Inventory [Line Items]
Inventory (credit) charge	$ 205

Inventories - Summary of Change

Inventories - Summary of Changes in Allowance for Slow-moving and Obsolete Inventories (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Inventory Disclosure [Abstract]
Balance at beginning of period	$ 2,813	$ 2,493	$ 2,678	$ 3,443
Provision for slow-moving and obsolete inventories ̶ net	160	30	378	130
Reductions for sale, consumption or scrap of previously reserved amounts	(42)	(55)	(50)	(1,110)
Foreign currency translation adjustments	(61)	94	(136)	99
Balance at end of period	$ 2,870	$ 2,562	$ 2,870	$ 2,562

Product Warranty Reserves - Add

Product Warranty Reserves - Additional Information (Detail) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Product Warranties Disclosures [Abstract]
Standard product warranty period	Substantially all of the Company’s 3D printing machines are covered by a standard one-year 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 balance	$ 1,011	$ 1,335

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, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Guarantees [Abstract]
Balance at beginning of period	$ 1,100	$ 603	$ 1,335	$ 866
Provisions for new issuances	422	391	1,313	854
Payments	(373)	(561)	(1,769)	(1,406)
Reserve adjustments	(126)	607	167	728
Foreign currency translation adjustments	(12)	25	(35)	23
Balance at end of period	$ 1,011	$ 1,065	$ 1,011	$ 1,065

Contingencies and Commitments -

Contingencies and Commitments - Additional Information (Detail) € in Thousands, $ in Thousands	Feb. 24, 2020USD ($)	Feb. 24, 2020EUR (€)	Sep. 30, 2021USD ($)	Sep. 30, 2021EUR (€)	Dec. 31, 2020USD ($)	Dec. 31, 2020EUR (€)
Line Of Credit Facility [Line Items]
Cash collateral			$ 1,270	€ 1,096	$ 0
Amended GmbH Credit Agreement [Member] | Financial Guarantees and Letters of Credit [Member]
Line Of Credit Facility [Line Items]
Line of credit facility, increased capacity amount	$ 4,057	€ 3,500
Amended GmbH Credit Agreement [Member] | Financial Guarantees and Letters of Credit [Member] | German Bank [Member]
Line Of Credit Facility [Line Items]
Credit facility, outstanding amount			$ 2,429	€ 2,096	$ 928	€ 756
Debt expiration dates range start			Nov. 30, 2021
Debt expiration dates range end			Mar. 31, 2023
Minimum [Member] | Amended GmbH Credit Agreement [Member] | Financial Guarantees and Letters of Credit [Member] | German Bank [Member]
Line Of Credit Facility [Line Items]
Issuance of financial guarantees and letters of credit	1,159	1,000
Maximum [Member] | Cash Collateral [Member] | Amended GmbH Credit Agreement [Member] | Financial Guarantees and Letters of Credit [Member] | German Bank [Member]
Line Of Credit Facility [Line Items]
Issuance of financial guarantees and letters of credit	$ 1,159	€ 1,000

Related Party Revolving Credi_2

Related Party Revolving Credit Facility - Additional Information (Detail) - USD ($)	Feb. 18, 2020	Mar. 12, 2018	Mar. 31, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Related Party Transaction [Line Items]
Amortization of debt issuance costs					$ 7,000	$ 39,000
Revolving Credit Facility [Member]
Related Party Transaction [Line Items]
Cash payment			$ 105,000
Revolving Credit Facility [Member] | LBM Holdings, LLC [Member]
Related Party Transaction [Line Items]
Line of credit facility, maximum borrowing capacity		$ 15,000,000
Credit facility, expiration period		3 years
Credit facility, expiration date		Mar. 12, 2021
Credit facility, description of variable rate basis					one-month LIBOR
Credit facility, commitment fee on unused portion, percentage		0.75%
Credit facility, commitment fee on unused portion, payable term					The Credit Agreement required a commitment fee of 75 basis points, or 0.75%, on the unused portion of the facility, payable monthly in arrears
Credit facility, up-front commitment fee percentage		1.25%
Credit facility, up-front commitment fee amount		$ 188,000
Debt issuance costs, gross					$ 265,000
Interest expense relating to the Credit Agreement			129,000	$ 34,000		113,000
Interest expense related to commitment fee			18,000	26,000		78,000
Amortization of debt issuance costs			6,000	8,000		35,000
Debt issuance costs, net			$ 105,000
Credit facility, borrowings				$ 0		$ 0
Revolving Credit Facility [Member] | LBM Holdings, LLC [Member] | London Interbank Offered Rate (LIBOR)
Related Party Transaction [Line Items]
Credit facility, basis spread on variable rate		5.00%
Amended Revolving Credit Facility [Member] | LBM Holdings, LLC [Member]
Related Party Transaction [Line Items]
Line of credit facility, maximum borrowing capacity	$ 10,000,000
Credit facility, expiration date	Mar. 31, 2024
Credit facility, commitment fee on unused portion, percentage	1.00%
Debt issuance costs, gross					$ 49,000

Long-Term Debt - Components of

Long-Term Debt - Components of Long-Term Debt (Detail) $ in Thousands	Dec. 31, 2020USD ($)
Debt Disclosure [Abstract]
Paycheck Protection Program loan	$ 2,194
Building note payable, Principal	1,226
Less: amount due within one year, Principal	(1,626)
Long-term debt - net of current portion, Principal	1,794
Building note payable, Unamortized Debt Issuance Costs	(15)
Less: amount due within one year, Unamortized Debt Issuance Costs	4
Long-term debt - net of current portion, Unamortized Debt Issuance Costs	(11)
Paycheck Protection Program loan	2,194
Building note payable, Net	1,211
Less: amount due within one year, Net	(1,622)
Long-term debt ̶ net of current portion	$ 1,783

Long-Term Debt - Additional Inf

Long-Term Debt - Additional Information (Detail) - USD ($) $ in Thousands	Feb. 26, 2021	Apr. 18, 2020	Sep. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Debt Instrument [Line Items]
Loan principal amount								$ 2,194
Gains On Extinguishment Of Debt			$ 2,220			$ 2,101
Interest expense			$ 2		$ 54	169	$ 171
Building Note Payable [Member]
Debt Instrument [Line Items]
Gains On Extinguishment Of Debt				$ 14
Notes payable monthly payments						$ 18
Building note payable, with monthly payments interest rate			4.00%			4.00%
Building note payable, with monthly payments basis spread						3.25%
Date of interest rate adjustment						2017-05
Notes payable maturity						2027-05
Cash payment	$ 1,199
Notes Payable	$ 1,185
Interest expense				$ 0
United States Treasury Securities [Member] | Building Note Payable [Member]
Debt Instrument [Line Items]
Notes payable monthly payments						$ 19
Principal Forgiveness
Debt Instrument [Line Items]
Gains On Extinguishment Of Debt			$ 2,194
Accrued Interest Forgiveness
Debt Instrument [Line Items]
Gains On Extinguishment Of Debt			$ 26
Paycheck Protection Program [Member]
Debt Instrument [Line Items]
Loan bears interest rate		1.00%
Maturity date		Apr. 18, 2022
Lender [Member] | Paycheck Protection Program [Member]
Debt Instrument [Line Items]
Loan principal amount		$ 2,194

Income Taxes - Additional Infor

Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Schedule Of Income Taxes [Line Items]
Provision (benefit) for income taxes	$ 1	$ (34)	$ (410)	$ 200
Effective tax rate	0.00%	1.00%	2.40%	1.90%
United States statutory rate	21.00%	21.00%	21.00%	21.00%
Japanese Tax Authorities [Member]
Schedule Of Income Taxes [Line Items]
Provision (benefit) for income taxes			$ (412)
Income tax refunds			$ 412

Equity-Based Compensation - Add

Equity-Based Compensation - Additional Information (Detail) - USD ($)	Jan. 24, 2013	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity-based compensation expense		$ 450,000	$ 379,000	$ 1,108,000	$ 828,000
Weighted-average remaining vesting period				10 months 24 days
Proceeds from exercise of employee stock options				$ 2,429,000	858,000
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity-based compensation expense		57,000	127,000	242,000	316,000
Total future compensation expense		137,000		137,000
Intrinsic value, stock options exercisable		5,966,000		5,966,000
Intrinsic value, stock options expected to vest		322,000		$ 322,000
Weighted average remaining contractual term of stock options exercisable				2 years 3 months 18 days
Weighted average remaining contractual term of stock options expected to vest				3 years 7 months 6 days
Intrinsic value of stock options exercised				$ 5,906,000	1,096,000
Proceeds from exercise of employee stock options				2,460,000	858,000
Income tax benefit				0
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity-based compensation expense		338,000	244,000	697,000	490,000
Total future compensation expense		$ 2,460,000		2,460,000
Fair value of restricted shares vested				2,424,000	635,000
Fair value of shares withheld				$ 7,000	15,000
Maximum [Member] | Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period				3 years
Stock options contractual expiration period				10 years
Maximum [Member] | Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period				3 years
Minimum [Member] | Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period				1 year
Stock options contractual expiration period				5 years
Minimum [Member] | Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period				1 year
2013 Equity Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock reserved for issuance	500,000
Remaining shares available for future issuances		412,404		412,404
2013 Equity Incentive Plan [Member] | Common Stock [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of outstanding shares of common stock	3.00%
Number of Shares authorized	1,992,241
2020 Annual Incentive Programme [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity-based compensation expense			$ 0		$ 0
2021 Annual Incentive Program [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity-based compensation expense		$ 24,000		$ 69,000
Two Thousand And Twenty One Executive Stock Performance Program
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity-based compensation expense		$ 21,000		$ 56,000

Equity-Based Compensation - Sum

Equity-Based Compensation - Summary of Equity-Based Compensation Expense (Detail) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Equity-based compensation expense recognized:
Total equity-based compensation expense before income taxes		$ 450	$ 379	$ 1,108	$ 828
Benefit for income taxes		0	0	0	0
Total equity-based compensation expense net of income taxes		450	379	1,108	828
Stock Options [Member]
Equity-based compensation expense recognized:
Total equity-based compensation expense before income taxes		57	127	242	316
Restricted Stock [Member]
Equity-based compensation expense recognized:
Total equity-based compensation expense before income taxes		338	244	697	490
Other [Member]
Equity-based compensation expense recognized:
Total equity-based compensation expense before income taxes	[1]	$ 55	$ 8	$ 169	$ 22
[1]	For both the three months and nine months ended September 30, 2021, Other represents expense associated with the 2021 Program, the ESPP, and certain employee contractual amounts to be settled in equity. For the nine months ended September 30, 2021, Other also includes expense associated with unrestricted stock issued to a non-employee director. For each of the 2020 periods, Other represents expense associated with certain employee contractual amounts to be settled in equity.

Equity-Based Compensation - S_2

Equity-Based Compensation - Summary of Equity-Based Compensation Expense (Parenthetical) (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Benefit for income taxes from equity-based compensation	$ 0	$ 0	$ 0	$ 0

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	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average fair value per stock option	$ 19.04
Volatility	71.10%
Volatility, minimum		58.00%
Volatility, maximum		58.60%
Average risk-free interest rate	0.50%	0.20%
Dividend yield	0.00%	0.00%
Expected term (years)	3 years 6 months	3 years 6 months
Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average fair value per stock option		$ 5.11
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average fair value per stock option		$ 6.20

Equity-Based Compensation - S_3

Equity-Based Compensation - Summary of Activity for Stock Options (Detail) - $ / shares	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Stock options outstanding, Beginning balance	641,232	854,259
Stock options granted	4,500	25,022
Stock options exercised	(208,259)	(117,854)
Stock options forfeited	(500)	(79,936)
Stock options expired		(26,874)
Stock options outstanding, Ending balance	436,973	654,617
Exercisable at end of period	409,591	506,295
Expected to vest at end of period	27,382	148,322
Weighted average exercise price, Beginning balance	$ 9.80	$ 9.34
Weighted average exercise price, Stock options granted	38.22	14.40
Weighted average exercise price, Stock options exercised	11.81	7.28
Weighted average exercise price, Stock options forfeited	7.11	7.85
Weighted average exercise price, Stock options expired		12.02
Weighted average exercise price, Ending balance	9.14	9.81
Weighted average exercise price, Exercisable	8.81	10.46
Weighted average exercise price, Expected to vest, net of forfeitures	14.05	7.62
Weighted average grant date fair value, Beginning balance	4.74	4.49
Weighted average grant date fair value, Stock options granted	19.04	5.99
Weighted average grant date fair value, Stock options exercised	6.45	3.12
Weighted average grant date fair value, Stock options forfeited	2.77	3.41
Weighted average grant date fair value, Stock options expired		6.78
Weighted average grant date fair value, Ending balance	4.07	4.75
Weighted average grant date fair value, Exercisable	3.92	5.27
Weighted average grant date fair value, Expected to vest, net of forfeitures	$ 6.29	$ 3.01

Equity-Based Compensation - S_4

Equity-Based Compensation - Summary of Activity for Restricted Stock Awards (Detail) - Restricted Stock [Member] - $ / shares	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Restricted Shares, outstanding, Beginning Balance	188,891	66,513
Number of Restricted Shares, granted	81,083	209,891
Number of Restricted Shares, vested	(87,963)	(77,013)
Number of Restricted Shares, outstanding, Ending Balance	182,011	199,391
Number of Restricted Shares, expected to vest	182,011	199,391
Weighted Average Grant Date Fair Value, Beginning Balance	$ 9.52	$ 8.76
Weighted Average Grant Date Fair Value, granted	22.12	9.58
Weighted Average Grant Date Fair Value, vested	8.84	8.94
Weighted Average Grant Date Fair Value, Ending Balance	15.47	9.55
Weighted Average Grant Date Fair Value, expected to vest	$ 15.47	$ 9.55

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, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Revenue, Major Customer [Line Items]
Accounts receivable from significant customers	$ 3,175		$ 3,175		$ 1,633
Customer Concentration Risk [Member] | Sales Revenue, Net [Member]
Revenue, Major Customer [Line Items]
Revenue concentration, by most significant customers	33.30%	39.50%	18.70%	20.00%

Other (Income) Expense - Net -

Other (Income) Expense - Net - Schedule of Other (Income) Expense - Net (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Other Income And Expenses [Abstract]
Interest income	$ (8)	$ (4)	$ (14)	$ (19)
Foreign currency (gains) losses - net	(36)	299	112	262
Other – net	(4)	19	(35)	76
Other (income) expense - net	$ (48)	$ 314	$ 63	$ 319