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Document and Entity Information - shares	3 Months Ended
Document and Entity Information - shares	Mar. 31, 2017	May 01, 2017
Document and Entity Information
Entity Registrant Name	AXCELIS TECHNOLOGIES INC
Entity Central Index Key	0001113232
Document Type	10-Q
Document Period End Date	Mar. 31, 2017
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Entity Current Reporting Status	Yes
Entity Filer Category	Accelerated Filer
Entity Common Stock, Shares Outstanding		30,095,828
Document Fiscal Year Focus	2017
Document Fiscal Period Focus	Q1

Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Revenue:
Product	$ 81,978	$ 62,175
Services	4,915	5,346
Total revenue	86,893	67,521
Cost of revenue:
Product	46,797	40,263
Services	5,382	3,842
Total cost of revenue	52,179	44,105
Gross profit	34,714	23,416
Operating expenses:
Research and development	9,895	8,636
Sales and marketing	7,049	5,960
General and administrative	7,057	6,042
Restructuring charges		282
Total operating expenses	24,001	20,920
Income from operations	10,713	2,496
Other (expense) income:
Interest income	69	54
Interest expense	(1,111)	(1,047)
Other, net	(154)	(59)
Total other expense	(1,196)	(1,052)
Income before income taxes	9,517	1,444
Income tax provision (benefit)	11	(504)
Net income	$ 9,506	$ 1,948
Net income per share:
Basic (in dollars per share)	$ 0.32	$ 0.07
Diluted (in dollars per share)	$ 0.29	$ 0.06
Shares used in computing net income per share:
Basic weighted average common shares	29,772	29,038
Diluted weighted average common shares	32,255	30,520

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Consolidated Statements of Comprehensive Income
Net income	$ 9,506	$ 1,948
Other comprehensive income:
Foreign currency translation adjustments	1,915	1,049
Amortization of actuarial gains/losses and other adjustments from pension plan	28	26
Total other comprehensive income	1,943	1,075
Comprehensive income	$ 11,449	$ 3,023

Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 69,429	$ 70,791
Accounts receivable, net	67,083	50,573
Inventories, net	115,635	113,853
Prepaid expenses and other current assets	7,937	5,512
Total current assets	260,084	240,729
Property, plant and equipment, net	31,486	30,840
Long-term restricted cash	6,792	6,864
Other assets	24,245	23,798
Total assets	322,607	302,231
Current liabilities:
Accounts payable	26,426	24,996
Accrued compensation	5,920	5,142
Warranty	2,748	2,426
Income taxes	252	240
Deferred revenue	12,179	10,335
Other current liabilities	5,310	4,592
Total current liabilities	52,835	47,731
Sale leaseback obligation	47,681	47,586
Long-term deferred revenue	942	674
Other long-term liabilities	4,906	4,785
Total liabilities	106,364	100,776
Stockholders' equity:
Common stock, $0.001 par value, 75,000 shares authorized; 29,995 shares issued and outstanding at March 31, 2017; 29,518 shares issued and outstanding at December 31, 2016	30	30
Additional paid-in capital	538,747	535,408
Accumulated deficit	(322,198)	(331,704)
Accumulated other comprehensive loss	(336)	(2,279)
Total stockholders' equity	216,243	201,455
Total liabilities and stockholders' equity	$ 322,607	$ 302,231

Consolidated Balance Sheets (Parenthetical) - $ / shares shares in Thousands	Mar. 31, 2017	Dec. 31, 2016
Consolidated Balance Sheets
Preferred stock, par value (in dollars per share)	$ 0.001	$ 0.001
Preferred stock, shares authorized	30,000	30,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, shares authorized	75,000	75,000
Common stock, shares issued	29,995	29,518
Common stock, shares outstanding	29,995	29,518

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Cash flows from operating activities
Net income	$ 9,506	$ 1,948
Adjustments to reconcile net income to net cash used in operating activities:
Depreciation and amortization	1,177	918
Deferred taxes	(22)	(50)
Stock-based compensation expense	1,075	838
Provision for excess and obsolete inventory	578	549
Changes in operating assets & liabilities:
Accounts receivable	(16,178)	(10,287)
Inventories	(844)	1,143
Prepaid expenses and other current assets	(2,347)	(1,214)
Accounts payable and other current liabilities	3,049	1,082
Deferred revenue	2,085	226
Income taxes	2	30
Other assets and liabilities	(749)	(5,364)
Net cash used in operating activities	(2,668)	(10,181)
Cash flows from investing activities
Expenditures for property, plant and equipment	(1,116)	(1,275)
Net cash used in investing activities	(1,116)	(1,275)
Cash flows from financing activities
Net settlement on restricted stock grants	(286)	(2)
Proceeds from exercise of stock options	2,531	194
Net cash provided by financing activities	2,245	192
Effect of exchange rate changes on cash and cash equivalents	105	(127)
Net decrease in cash, cash equivalents and restricted cash	(1,434)	(11,391)
Cash, cash equivalents and restricted cash at beginning of period	77,655	85,825
Cash, cash equivalents and restricted cash at end of period	$ 76,221	$ 74,434

Nature of Business	3 Months Ended
Nature of Business	Mar. 31, 2017
Nature of Business
Nature of Business	Note 1. Nature of Business Axcelis Technologies, Inc. (“Axcelis” or the “Company”) was incorporated in Delaware in 1995, and is a worldwide producer of ion implantation and other processing equipment used in the fabrication of semiconductor chips in the United States, Europe and Asia. In addition, the Company provides extensive aftermarket service and support, including spare parts, equipment upgrades, used equipment and maintenance services to the semiconductor industry. The accompanying unaudited consolidated financial statements have been prepared in accordance with U.S. generally accepted accounting principles for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by generally accepted accounting principles for complete financial statements. In the opinion of management, all adjustments which are of a normal recurring nature and considered necessary for a fair presentation of these financial statements have been included. Operating results for the interim period presented are not necessarily indicative of the results that may be expected for other interim periods or for the year as a whole. The balance sheet at December 31, 2016 has been derived from the audited financial statements at that date but does not include all of the information and footnotes required by generally accepted accounting principles for complete financial statements. For further information, refer to the consolidated financial statements and footnotes thereto included in Axcelis Technologies, Inc.’s Annual Report on Form 10-K for the year ended December 31, 2016.

Stock-Based Compensation	3 Months Ended
Stock-Based Compensation	Mar. 31, 2017
Stock-Based Compensation
Stock-Based Compensation	Note 2. Stock-Based Compensation The Company maintains the Axcelis Technologies, Inc. 2012 Equity Incentive Plan (the “2012 Equity Plan”), which became effective on May 2, 2012, and permits the issuance of options, restricted stock, restricted stock units and performance awards to selected employees, directors and consultants of the Company. The Company’s 2000 Stock Plan (the “2000 Stock Plan”), expired on May 1, 2012 and no new grants may be made under that plan after that date. However, unexpired awards granted under the 2000 Stock Plan remain outstanding and subject to the terms of the 2000 Stock Plan. The Company also maintains the Axcelis Technologies, Inc. Employee Stock Purchase Plan (the “ESPP”), an Internal Revenue Code Section 423 plan. The 2012 Equity Plan and the ESPP are more fully described in Note 14 to the consolidated financial statements in the Company’s 2016 Annual Report on Form 10-K. The Company recognized stock-based compensation expense of $1.1 million and $0.8 million for the three month periods ended March 31, 2017 and 2016, respectively. These amounts include compensation expense related to restricted stock units and non-qualified stock options. In the three month periods ended March 31, 2017 and 2016, the Company issued 0.5 million and 0.1 million shares of common stock, respectively, in relation to stock option exercises and vesting of restricted stock units. In the three month periods ended March 31, 2017 and 2016, the Company received proceeds of $2.5 million and $0.2 million, respectively, in connection with the exercise of stock options.

- Definition

The entire disclosure for compensation-related costs for equity-based compensation, which may include disclosure of policies, compensation plan details, allocation of equity compensation, incentive distributions, equity-based arrangements to obtain goods and services, deferred compensation arrangements, employee stock ownership plan details and employee stock purchase plan details.

+ References + Details

Computation of Net Earnings per Share

3 Months Ended

Mar. 31, 2017

Computation of Net Earnings per Share

Computation of Net Earnings per Share

Note 3. Computation of Net Earnings per Share

Basic earnings per share is computed by dividing income available to common stockholders (the numerator) by the weighted‑average number of common shares outstanding (the denominator) for the period. The computation of diluted earnings per share is similar to basic earnings per share, except that the denominator is increased by the number of additional common shares that would have been outstanding if the potentially dilutive common shares issuable for stock options, restricted stock units and employee stock purchase plan accounts had been issued, calculated using the treasury stock method.

The components of net earnings per share are as follows:


	Three months ended March 31,
	2017		2016

Net income available to common stockholders	$	9,506	$	1,948
Weighted average common shares outstanding used in computing basic income per share		29,772		29,038
Incremental options and RSUs		2,483		1,482
Weighted average common shares outstanding used in computing diluted net income per share		32,255		30,520
Net income per share
Basic	$	0.32	$	0.07
Diluted	$	0.29	$	0.06

Diluted weighted average common shares outstanding does not include options and restricted stock units outstanding to purchase 0.1 million and 0.9 million common equivalent shares for the three month periods ended March 31, 2017 and 2016, respectively, as their effect would have been anti-dilutive.

Accumulated Other Comprehensive Loss

3 Months Ended

Mar. 31, 2017

Accumulated Other Comprehensive Loss

Accumulated Other Comprehensive Loss

Note 4. Accumulated Other Comprehensive Loss

The following table presents the changes in accumulated other comprehensive income (loss), net of tax, by component for the three months ended March 31, 2017:


	Foreign		Defined benefit
	currency		pension plan		Total
	(in thousands)
Balance at December 31, 2016	$	(1,591)	$	(688)	$	(2,279)
Other comprehensive income and pension reclassification		1,915		28		1,943
Balance at March 31, 2017	$	324	$	(660)	$	(336)

- Definition

The entire disclosure for comprehensive income, which includes, but is not limited to, 1) the amount of income tax expense or benefit allocated to each component of other comprehensive income, including reclassification adjustments, 2) the reclassification adjustments for each classification of other comprehensive income and 3) the ending accumulated balances for each component of comprehensive income.

+ References

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+ Details

Cash, cash equivalents and restricted cash

3 Months Ended

Mar. 31, 2017

Cash, cash equivalents and restricted cash

Cash, cash equivalents and restricted cash

Note 5. Cash, cash equivalents and restricted cash

The following table provides a reconciliation of cash, cash equivalents, and restricted cash reported within the statement of financial position that sum to the total of the same such amounts shown in the statement of cash flows.


	March 31,
	2017			2016
	(dollars in thousands)
Cash and cash equivalents	$	69,429	$	67,571
Long-term restricted cash		6,792		6,863
Total cash, cash equivalents and long-term restricted cash	$	76,221	$	74,434

The restricted cash balances of $6.8 million as of March 31, 2017 relates to a $5.9 million letter of credit associated to the security deposit for the sale leaseback transaction, a $0.8 million letter of credit relating to workers’ compensation insurance and a $0.1 million deposit relating to customs activity. The restricted cash balance of $6.9 million as of March 31, 2016 includes the $5.9 million letter of credit associated to the security deposit for the sale leaseback transaction, a $0.9 million letter of credit relating to workers’ compensation insurance and a $0.1 million deposit relating to customs activity.

Inventories, net

3 Months Ended

Mar. 31, 2017

Inventories, net

Inventories, net

Note 6. Inventories, net

The components of inventories are as follows:


	March 31,		December 31,
	2017		2016
	(in thousands)
Raw materials	$	78,055	$	82,263
Work in process		19,892		14,117
Finished goods (completed systems)		17,688		17,473
Inventories, net	$	115,635	$	113,853

When recorded, inventory reserves are intended to reduce the carrying value of inventories to their net realizable value. The Company establishes inventory reserves when conditions exist that indicate inventory may be in excess of anticipated demand or is obsolete based upon assumptions about future demand for the Company’s products or market conditions. The Company regularly evaluates the ability to realize the value of inventories based on a combination of factors including the following: forecasted sales or usage, estimated product end of life dates, estimated current and future market value and new product introductions. Purchasing and usage alternatives are also explored to mitigate inventory exposure. As of March 31, 2017 and December 31, 2016, inventories are stated net of inventory reserves of $8.6 million and $8.8 million, respectively.

Product Warranty

3 Months Ended

Mar. 31, 2017

Product Warranty

Product Warranty

Note 7. Product Warranty

The Company generally offers a one year warranty for all of its systems, the terms and conditions of which vary depending upon the product sold. For all systems sold, the Company accrues a liability for the estimated cost of standard warranty at the time of system shipment and defers the portion of systems revenue attributable to the fair value of non-standard warranty. Costs for non-standard warranty are expensed as incurred. Factors that affect the Company’s warranty liability include the number of installed units, historical and anticipated product failure rates, material usage and service labor costs. The Company periodically assesses the adequacy of its recorded liability and adjusts the amount as necessary.

The changes in the Company’s standard product warranty liability are as follows:


	Three months ended
	March 31,
	2017		2016
	(in thousands)
Balance at January 1 (beginning of year)	$	2,666	$	3,555
Warranties issued during the period		1,166		921
Settlements made during the period		(454)		(1,306)
Changes in estimate of liability for pre-existing warranties during the period		(254)		365
Balance at March 31 (end of period)	$	3,124	$	3,535

Amount classified as current	$	2,748	$	3,288
Amount classified as long-term		376		247
Total warranty liability	$	3,124	$	3,535

Fair Value Measurements

3 Months Ended

Mar. 31, 2017

Fair Value Measurements

Fair Value Measurements

Note 8. Fair Value Measurements

Certain assets on the Company’s balance sheets are reported at their “fair value.” Fair value is defined as the exchange price that would be received for an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date.

(a) Fair Value Hierarchy

The accounting guidance for fair value measurement requires an entity to maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value. The standard establishes a fair value hierarchy based on the level of independent, objective evidence surrounding the inputs used to measure fair value. A financial instrument’s categorization within the fair value hierarchy is based upon the lowest level of input that is significant to the fair value measurement. The fair value hierarchy is as follows:

Level 1 - applies to assets or liabilities for which there are quoted prices in active markets for identical assets or liabilities.

Level 2 - applies to assets or liabilities for which there are inputs other than quoted prices that are observable for the asset or liability, such as quoted prices for similar assets or liabilities in active markets; quoted prices for identical assets or liabilities in markets with insufficient volume or infrequent transactions (less active markets); or model-derived valuations in which significant inputs are observable or can be derived principally from, or corroborated by, observable market data.

Level 3 - applies to assets or liabilities for which there are unobservable inputs to the valuation methodology that are significant to the measurement of the fair value of the assets or liabilities.

(b) Fair Value Measurements

The Company’s money market funds are included in cash and cash equivalents in the consolidated balance sheets and are considered a level 1 investment as they are valued at quoted market prices in active markets.

The following table sets forth the Company’s assets by level within the fair value hierarchy:


	March 31, 2017
	Fair Value Measurements
	Level 1		Level 2		Level 3		Total
	(in thousands)
Assets
Cash equivalents:
Money market funds	$	53,164	$	—	$	—	$	53,164


	December 31, 2016
	Fair Value Measurements
	Level 1		Level 2		Level 3		Total
	(in thousands)
Assets
Cash equivalents:
Money market funds	$	54,170	$	—	$	—	$	54,170

The carrying amounts reflected in the consolidated balance sheets for cash and cash equivalents (which are comprised primarily of deposit and investment accounts), accounts receivable, prepaid expenses and other current and non-current assets, accounts payable and accrued expenses approximate fair value due to their short-term maturities.

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

+ References + Details

Financing Arrangements	3 Months Ended
Financing Arrangements	Mar. 31, 2017
Financing Arrangements
Financing Arrangements	Note 9. Financing Arrangements Sale Leaseback Obligation On January 30, 2015, the Company sold its corporate headquarters facility for $48.9 million. As part of the sale, the Company also entered into a 22-year lease agreement. The sale leaseback is accounted for as a financing arrangement for financial reporting and, as such, the Company has recorded a financing obligation of $47.7 million as of March 31, 2017. The associated lease payments are deemed to include both an interest component and payment of principal, with the underlying liability being extinguished at the end of the original lease term. The Company posted a collateralized security deposit of $5.9 million in the form of an irrevocable letter of credit at the time of the closing. Upon the termination of a credit facility in October 2015, this letter of credit was cash collateralized.

Income Taxes	3 Months Ended
Income Taxes	Mar. 31, 2017
Income Taxes
Income Taxes	Note 10. Income Taxes Income tax expense relates principally to operating results of foreign entities in jurisdictions, primarily in Europe and Asia, where the Company earns taxable income. The Company has significant net operating losses in the United States and certain other tax jurisdictions and, as a result, does not pay significant income taxes in those jurisdictions. At December 31, 2016, the Company had $124.0 million of deferred tax assets worldwide relating to net operating loss carryforwards, tax credit carryforwards and other temporary differences, which are available to reduce income taxes in future years. The Company maintains a 100% domestic valuation allowance, reducing the carrying value of the deferred tax assets in the United States to zero. The Company will continue to maintain a full valuation allowance for those tax assets until accounting principles require the release of the allowance based on expectations of continuing profitability. During the first quarter of 2017, the statute of limitations associated with tax positions previously taken by the Company expired. The related tax reserve of $0.3 million and accrued interest of $0.2 million that had been recorded were reversed during the three months ended March 31, 2017.

Concentration of Risk	3 Months Ended
Concentration of Risk	Mar. 31, 2017
Concentration of Risk
Concentration of Risk	Note 11. Concentration of Risk For the three months ended March 31, 2017, four customers accounted for 19.2%, 16.6%, 16.4% and 16.3% of consolidated revenue, respectively. For the three months ended March 31, 2016, three customers accounted for 20.8%, 13.4% and 13.2%, of consolidated revenue, respectively. At March 31, 2017, three customers accounted for 24.9%, 21.5% and 12.7% of consolidated accounts receivable, respectively. At December 31, 2016, four customers accounted for 22.0%, 12.3%, 12.0% and 10.6% of accounts receivable, respectively.

Contingencies	3 Months Ended
Contingencies	Mar. 31, 2017
Contingencies
Contingencies	Note 12. Contingencies (a) Litigation The Company is, from time to time, a party to litigation that arises in the normal course of its business operations. The Company is not presently a party to any litigation that it believes might have a material adverse effect on its business operations. (b) Indemnifications The Company’s system sales agreements typically include provisions under which the Company agrees to take certain actions, provide certain remedies and defend its customers against third-party claims of intellectual property infringement under specified conditions and to indemnify customers against any damage and costs awarded in connection with such claims. The Company has not incurred any material costs as a result of such indemnifications and has not accrued any liabilities related to such obligations in the accompanying consolidated financial statements.

Recent Accounting Guidance	3 Months Ended
Recent Accounting Guidance	Mar. 31, 2017
Recent Accounting Guidance
Recent Accounting Guidance	Note 13. Recent Accounting Guidance Accounting Standards or Updates Adopted In July 2015, the FASB issued Accounting Standards Update (ASU) No. 2015-11, “Simplifying the Measurement of Inventory,” which changes the inventory measurement principles for entities using the first-in, first-out (FIFO) or average cost methods. For entities utilizing one of these methods, the inventory measurement principle changes from lower of cost or market to the lower of cost and net realizable value. Net realizable value is the estimated selling price in the ordinary course of business, less the reasonably predictable costs of completion, disposal and transportation. The prospective adoption of this ASU in the first quarter of 2017 did not have a material impact on our financial statements and disclosures. In March 2016, the FASB issued ASU No. 2016-09 “Compensation — Stock Compensation,” which changes the accounting for stock-based payment transactions, including the income tax consequences, classification of awards as either equity or liabilities, and classification on the statement of cash flows. The amended guidance eliminates the requirement to record excess tax benefits as a reduction in current taxes payable and an increase to additional paid-in capital. The Company adopted this ASU in the first quarter of 2017. The prospective adoption associated with excess tax benefits resulted in the generation of approximately $1.2 million of deferred tax assets relating to federal and state net operating losses that are fully offset by a corresponding increase in the valuation allowance. As a result, there was no adjustment to accumulated deficit. The retrospective adoption of the presentation of employee taxes paid on the statement of cash flows when an employer withholds shares for tax withholding purposes is presented as a financing activity. This resulted in a $0.3 million and a two thousand dollar reduction in net cash provided by financing activities for the three month periods ended March 31, 2017 and 2016, respectively. Prior to adoption, these amounts were reflected within cash flows from operating activities. The Company has also elected to continue to estimate a forfeiture rate associated with our stock-based awards and related expense. In November 2016, the FASB issued ASU 2016-18, “Statement of Cash Flows (Topic 203): Restricted Cash (a consensus of the FASB Emerging Issues Task Force).” This ASU requires the statement of cash flows to explain the change during the period in the total cash, cash equivalents, and amounts generally described as restricted cash or restricted cash equivalents. Therefore, amounts generally described as restricted cash and restricted cash equivalents are to be included with cash and cash equivalents when reconciling the beginning of period and end of period amounts shown on the statement of cash flows. The retrospective adoption of this ASU in the first quarter of 2017 resulted in $6.9 million of restricted cash being included in cash, cash equivalents and restricted cash balances on the statement of cash flows for the periods presented. Please see Note 5 for additional information. Accounting Standards or Updates Not Yet Effective In May 2014, the FASB issued ASU No. 2014-09, “Revenue from Contracts with Customers,” which provides guidance for revenue recognition. The standard’s core principle is that a company will recognize revenue when it transfers promised goods or services to customers in an amount that reflects the consideration to which the company expects to be entitled in exchange for those goods or services. In April 2016, the FASB issued ASU 2016-10, “Revenue from Contracts with Customers” (Topic 606): Identifying Performance Obligations and Licensing, which further clarifies performance obligations in a contract with a customer. In May 2016, the FASB issued ASU 2016-12, “Revenue from Contracts with Customers” (Topic 606): Narrow-Scope Improvements and Practical Expedients, which provides a more narrow interpretation of ASU No. 2014-09. These ASUs are effective for annual reporting periods beginning after December 15, 2017 and interim periods within those annual periods. We are currently evaluating the method of adoption and assessing the potential impact the adoption of these standards will have on our financial statements. In February 2016, the FASB issued ASU No. 2016-02 “Leases.” The ASU requires lessees to recognize the rights and obligations created by most leases as assets and liabilities on their balance sheet and continue to recognize expenses on their income statement over the lease term. It will also require disclosures designed to give financial statement users information on the amount, timing, and uncertainty of cash flows arising from leases. The guidance is effective for annual reporting periods beginning after December 15, 2018, and interim periods within those years. Early adoption is permitted for all entities. We are currently evaluating the impact of ASU 2016-02 on the consolidated financial statements and disclosures. In August 2016, the FASB issued ASU No. 2016-15 “Classification of Certain Cash Receipts and Cash Payments.” The ASU is intended to add or clarify guidance on the classification of certain receipts and payments in the statement of cash flows and to eliminate the diversity in practice related to such classifications. The guidance in ASU 2016-15 is required for annual reporting periods beginning after December 15, 2017, with early adoption permitted. We are currently evaluating the impact of ASU 2016-15 on the consolidated financial statements and disclosures. In March 2017, the FASB issued ASU No. 2017-07 “Compensation – Retirement Benefits (Topic 715): Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost.” The ASU is intended to improve the presentation of net periodic pension cost and net periodic postretirement benefit cost. The amendment applies to all entities offering defined benefit pension plan, other postretirement benefit plans, or other types of benefits accounted for under Topic 715. The amendments in the ASU require an employer to report the service cost component in the same line item or items as other compensation costs arising from services rendered by the pertinent employees during the period. The other components of net benefit cost are required to be presented in the income statement separately from the service cost component and outside a subtotal of income from operations. The amendments in this ASU are effective for public business entities for annual periods beginning after December 15, 2017, including interim periods within the annual period. The amendments in this ASU should be applied retrospectively for the presentation of the service cost component and the other components of net periodic pension cost and net periodic postretirement benefit cost in the income statement and prospectively, on and after the effective date, for the capitalization of the service cost component of net periodic pension cost and net periodic postretirement benefit in assets. We are currently evaluating the impact of ASU 2017-07 on the consolidated financial statements and disclosures.

- Definition

The entire disclosure of changes in accounting principles, including adoption of new accounting pronouncements, that describes the new methods, amount and effects on financial statement line items.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Change in Accounting Principle
-URI http://asc.fasb.org/extlink&oid=6507316

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Direct Effects of a Change in Accounting Principle
-URI http://asc.fasb.org/extlink&oid=66092750

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=64853466&loc=d3e22583-107794

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Indirect Effects of a Change in Accounting Principle
-URI http://asc.fasb.org/extlink&oid=6515603

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=64853466&loc=d3e22580-107794

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 270
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.10-01.(b)(6))
-URI http://asc.fasb.org/extlink&oid=27015980&loc=d3e46468-122699

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Accounting Change
-URI http://asc.fasb.org/extlink&oid=6503790

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=64853466&loc=d3e22499-107794

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Retrospective Application
-URI http://asc.fasb.org/extlink&oid=6523989

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 270
-SubTopic 10
-Section 45
-Paragraph 13
-URI http://asc.fasb.org/extlink&oid=68064558&loc=d3e765-108305

Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 270
-SubTopic 10
-Section 45
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=68064558&loc=d3e725-108305

+ Details

Computation of Net Earnings per Share (Tables)

3 Months Ended

Mar. 31, 2017

Computation of Net Earnings per Share

Schedule of components of net earnings per share


	Three months ended March 31,
	2017		2016

Net income available to common stockholders	$	9,506	$	1,948
Weighted average common shares outstanding used in computing basic income per share		29,772		29,038
Incremental options and RSUs		2,483		1,482
Weighted average common shares outstanding used in computing diluted net income per share		32,255		30,520
Net income per share
Basic	$	0.32	$	0.07
Diluted	$	0.29	$	0.06

Accumulated Other Comprehensive Loss (Tables)

3 Months Ended

Mar. 31, 2017

Accumulated Other Comprehensive Loss

Schedule of changes in accumulated other comprehensive income, net of tax


	Foreign		Defined benefit
	currency		pension plan		Total
	(in thousands)
Balance at December 31, 2016	$	(1,591)	$	(688)	$	(2,279)
Other comprehensive income and pension reclassification		1,915		28		1,943
Balance at March 31, 2017	$	324	$	(660)	$	(336)

Cash, cash equivalents and restricted cash (Tables)

3 Months Ended

Mar. 31, 2017

Cash, cash equivalents and restricted cash

Schedule of reconciliation of cash, cash equivalents and restricted cash


	March 31,
	2017			2016
	(dollars in thousands)
Cash and cash equivalents	$	69,429	$	67,571
Long-term restricted cash		6,792		6,863
Total cash, cash equivalents and long-term restricted cash	$	76,221	$	74,434

Inventories, net (Tables)

3 Months Ended

Mar. 31, 2017

Inventories, net

Schedule of components of inventories


	March 31,		December 31,
	2017		2016
	(in thousands)
Raw materials	$	78,055	$	82,263
Work in process		19,892		14,117
Finished goods (completed systems)		17,688		17,473
Inventories, net	$	115,635	$	113,853

Product Warranty (Tables)

3 Months Ended

Mar. 31, 2017

Product Warranty

Schedule of product warranty liability


	Three months ended
	March 31,
	2017		2016
	(in thousands)
Balance at January 1 (beginning of year)	$	2,666	$	3,555
Warranties issued during the period		1,166		921
Settlements made during the period		(454)		(1,306)
Changes in estimate of liability for pre-existing warranties during the period		(254)		365
Balance at March 31 (end of period)	$	3,124	$	3,535

Amount classified as current	$	2,748	$	3,288
Amount classified as long-term		376		247
Total warranty liability	$	3,124	$	3,535

Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2017

Fair Value Measurements

Schedule of Company's assets and liabilities by level within the fair value hierarchy


	March 31, 2017
	Fair Value Measurements
	Level 1		Level 2		Level 3		Total
	(in thousands)
Assets
Cash equivalents:
Money market funds	$	53,164	$	—	$	—	$	53,164


	December 31, 2016
	Fair Value Measurements
	Level 1		Level 2		Level 3		Total
	(in thousands)
Assets
Cash equivalents:
Money market funds	$	54,170	$	—	$	—	$	54,170

Stock-Based Compensation - (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Stock-based compensation
Stock-based compensation expense	$ 1,100	$ 800
Proceeds from exercise of stock options	$ 2,531	$ 194
Common Stock
Stock-based compensation
Exercise of stock options (in shares)	500,000	100,000
Proceeds from exercise of stock options	$ 2,500	$ 200
2000 Stock Plan
Stock-based compensation
Number of shares of common stock available for future grant	0

Computation of Net Earnings per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Computation of Net Earnings per Share
Net income available to common stockholders	$ 9,506	$ 1,948
Weighted average common shares outstanding used in computing basic income per share	29,772	29,038
Incremental options and RSUs	2,483	1,482
Weighted average common shares outstanding used in computing diluted net income per share	32,255	30,520
Net income per share
Basic	$ 0.32	$ 0.07
Diluted	$ 0.29	$ 0.06
Weighted average number diluted shares outstanding adjustment	100	900

Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Changes in accumulated other comprehensive income, net of tax
Balance at the beginning of period	$ (2,279)
Other comprehensive income and pension reclassification	1,943	$ 1,075
Balance at the end of period	(336)
Foreign currency
Changes in accumulated other comprehensive income, net of tax
Balance at the beginning of period	(1,591)
Other comprehensive income and pension reclassification	1,915
Balance at the end of period	324
Defined benefit pension plan
Changes in accumulated other comprehensive income, net of tax
Balance at the beginning of period	(688)
Other comprehensive income and pension reclassification	28
Balance at the end of period	$ (660)

Cash, cash equivalents and restricted cash (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016	Mar. 31, 2016	Dec. 31, 2015
Cash and cash equivalents	$ 69,429	$ 70,791	$ 67,571
Long-term restricted cash	6,792		6,863
Total cash, cash equivalents and long-term restricted cash	76,221	$ 77,655	74,434	$ 85,825
Workers' Compensation Liability	800		900
Deposit related to customs activity	100		100
Revolving credit facility
Availability used to support outstanding letters of credit	6,800		6,900
Revolving credit facility \| Sale leaseback obligation
Security Deposit	$ 5,900		$ 5,900

Inventories, net (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Inventories, net
Raw materials	$ 78,055	$ 82,263
Work in process	19,892	14,117
Finished goods (completed systems)	17,688	17,473
Inventories, net	115,635	113,853
Inventory reserves	$ 8,600	$ 8,800

Product Warranty (Details) - USD ($) $ in Thousands	3 Months Ended
Product Warranty (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2017	Dec. 31, 2016	Mar. 31, 2016
Product Warranty
Product warranty period	1 year
Changes in standard product warranty liability
Balance at the beginning of the period	$ 2,666	$ 3,555
Warranties issued during the period	1,166	921
Settlements made during the period	(454)	(1,306)
Changes in estimate of liability for pre-existing warranties during the period	(254)	365
Balance at the end of the period	3,124	3,535
Product warranty classification
Amount classified as current			$ 2,748	$ 2,426	$ 3,288
Amount classified as long-term			376		247
Total warranty liability	$ 2,666	$ 3,555	$ 3,124	$ 2,666	$ 3,535

Fair Value Measurements (Details) - Recurring - Money market funds - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Total
Fair Value Measurements
Money market funds	$ 53,164	$ 54,170
Level 1
Fair Value Measurements
Money market funds	$ 53,164	$ 54,170

Financing Arrangements (Details) - USD ($) $ in Thousands	Jan. 30, 2015	Mar. 31, 2017	Dec. 31, 2016
Financing Arrangements
Sale leaseback obligation		$ 47,681	$ 47,586
Beverly Property Owner LLC \| Sale leaseback obligation \| Buildings
Financing Arrangements
Purchase price	$ 48,900
Lease term	22 years
Sale leaseback obligation		47,700
Security deposit		$ 5,900

Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended
Income Taxes (Details) - USD ($) $ in Millions	Mar. 31, 2017	Dec. 31, 2016
Income Taxes
Deferred tax assets valuation allowance		$ 124.0
Percentage of valuation allowance	100.00%
Deferred tax assets, net of valuation allowance	$ 0.0
Reversal of tax reserve	0.3
Reversal of accrued interest	$ 0.2

Concentration of Risk (Details) - customer	3 Months Ended		12 Months Ended
Concentration of Risk (Details) - customer	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Revenue \| Customer concentration risk \| One customer
Concentration of risk
Number of customers	4	3
Percentage of concentration risk		20.80%	22.00%
Revenue \| Customer concentration risk \| Second customer
Concentration of risk
Number of customers	4	3
Percentage of concentration risk		13.40%	12.30%
Revenue \| Customer concentration risk \| Third customer
Concentration of risk
Number of customers	4	3
Percentage of concentration risk		13.20%	12.00%
Revenue \| Customer concentration risk \| Fourth customer
Concentration of risk
Number of customers			4
Percentage of concentration risk			10.60%
Revenue \| Credit concentration risk \| One customer
Concentration of risk
Percentage of concentration risk	19.20%
Revenue \| Credit concentration risk \| Second customer
Concentration of risk
Percentage of concentration risk	16.60%
Revenue \| Credit concentration risk \| Third customer
Concentration of risk
Percentage of concentration risk	16.40%
Revenue \| Credit concentration risk \| Fourth customer
Concentration of risk
Percentage of concentration risk	16.30%
Consolidated accounts receivable \| Customer concentration risk \| One customer
Concentration of risk
Number of customers	3		4
Consolidated accounts receivable \| Customer concentration risk \| Second customer
Concentration of risk
Number of customers	3		4
Consolidated accounts receivable \| Customer concentration risk \| Third customer
Concentration of risk
Number of customers	3		4
Consolidated accounts receivable \| Customer concentration risk \| Fourth customer
Concentration of risk
Number of customers			4
Consolidated accounts receivable \| Credit concentration risk \| One customer
Concentration of risk
Percentage of concentration risk	24.90%
Consolidated accounts receivable \| Credit concentration risk \| Second customer
Concentration of risk
Percentage of concentration risk	21.50%
Consolidated accounts receivable \| Credit concentration risk \| Third customer
Concentration of risk
Percentage of concentration risk	12.70%