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Document and Entity Information - shares	6 Months Ended
Document and Entity Information - shares	Jun. 30, 2016	Aug. 04, 2016
Document and Entity Information
Entity Registrant Name	AXCELIS TECHNOLOGIES INC
Entity Central Index Key	0001113232
Document Type	10-Q
Document Period End Date	Jun. 30, 2016
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		29,158,172
Document Fiscal Year Focus	2016
Document Fiscal Period Focus	Q2

Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Revenue:
Product	$ 58,859	$ 72,748	$ 121,034	$ 140,278
Services	5,592	5,689	10,938	11,442
Total revenue	64,451	78,437	131,972	151,720
Cost of revenue:
Product	34,638	46,560	74,902	91,745
Services	4,682	4,703	8,523	9,421
Total cost of revenue	39,320	51,263	83,425	101,166
Gross profit	25,131	27,174	48,547	50,554
Operating expenses:
Research and development	8,478	7,899	17,114	16,098
Sales and marketing	5,790	5,858	11,750	11,486
General and administrative	6,232	6,231	12,274	12,332
Restructuring charges		8	282	18
Total operating expenses	20,500	19,996	41,420	39,934
Income from operations	4,631	7,178	7,127	10,620
Other (expense) income:
Interest income	54	6	108	9
Interest expense	(1,338)	(1,310)	(2,385)	(2,353)
Other, net	(238)	49	(297)	(384)
Total other (expense) income	(1,522)	(1,255)	(2,574)	(2,728)
Income before income taxes	3,109	5,923	4,553	7,892
Income tax provision (benefit)	172	40	(332)	141
Net income	$ 2,937	$ 5,883	$ 4,885	$ 7,751
Net income per share
Basic (in dollars per share)	$ 0.10	$ 0.21	$ 0.17	$ 0.27
Diluted (in dollars per share)	$ 0.10	$ 0.20	$ 0.16	$ 0.26
Shares used in computing net income per share:
Basic weighted average common shares	29,097	28,446	29,066	28,367
Diluted weighted average common shares	30,701	30,153	30,607	29,975

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Consolidated Statements of Comprehensive Income
Net income	$ 2,937	$ 5,883	$ 4,885	$ 7,751
Other comprehensive (loss) income:
Foreign currency translation adjustments	(456)	329	593	(681)
Amortization of actuarial gains from pension plan	26	19	52	38
Total other comprehensive (loss) income	(430)	348	645	(643)
Comprehensive income	$ 2,507	$ 6,231	$ 5,530	$ 7,108

Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Current assets
Cash and cash equivalents	$ 60,981	$ 78,889
Accounts receivable, net	63,482	36,868
Inventories, net	110,582	109,408
Prepaid expenses and other current assets	7,658	4,792
Total current assets	242,703	229,957
Property, plant and equipment, net	31,057	30,031
Long-term restricted cash	6,862	6,936
Other assets	18,666	14,860
Total assets	299,288	281,784
Current liabilities
Accounts payable	26,836	19,849
Accrued compensation	5,935	9,059
Warranty	2,958	3,363
Income taxes	196	143
Deferred revenue	13,781	7,863
Other current liabilities	4,584	4,091
Total current liabilities	54,290	44,368
Sale leaseback obligation	47,586	47,586
Long-term deferred revenue	650	679
Other long-term liabilities	4,950	5,387
Total liabilities	107,476	98,020
Commitments and contingencies (Note 14)
Stockholders' equity
Common stock, $0.001 par value, 75,000 shares authorized; 29,134 shares issued and outstanding at June 30, 2016; 29,025 shares issued and 28,995 shares outstanding at December 31, 2015	29	29
Additional paid-in capital	530,389	529,089
Treasury stock, at cost, no shares at June 30, 2016 and 30 at December 31, 2015		(1,218)
Accumulated deficit	(337,820)	(342,705)
Accumulated other comprehensive loss	(786)	(1,431)
Total stockholders' equity	191,812	183,764
Total liabilities and stockholders' equity	$ 299,288	$ 281,784

Consolidated Balance Sheets (Parenthetical) - $ / shares shares in Thousands	Jun. 30, 2016	Dec. 31, 2015
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	29,134	29,025
Common stock, shares outstanding	29,134	28,995
Treasury stock, shares	0	30

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Cash flows from operating activities
Net income	$ 4,885	$ 7,751
Adjustments to reconcile net income to net cash (used in) provided by operating activities:
Depreciation and amortization	2,061	2,298
Deferred taxes	480	97
Stock-based compensation expense	2,079	3,055
Provision for excess and obsolete inventory	815	537
Changes in operating assets & liabilities:
Accounts receivable	(26,448)	516
Inventories	(1,540)	(19,381)
Prepaid expenses and other current assets	(3,054)	(2,205)
Accounts payable and other current liabilities	3,721	21,213
Deferred revenue	5,875	1,671
Income taxes	50	104
Other assets and liabilities	(5,629)	(3,888)
Net cash (used in) provided by operating activities	(16,705)	11,768
Cash flows from investing activities
Expenditures for property, plant, and equipment	(1,859)	(672)
Net cash used in investing activities	(1,859)	(672)
Cash flows from financing activities
Decrease in restricted cash	74	760
Financing fees and other expenses	(117)	(847)
Principal payments on term Loan		(14,530)
Principal payments on sale leaseback obligation		(392)
Proceeds from sale leaseback obligation		48,940
Proceeds from exercise of stock options	556	1,665
Proceeds from Employee Stock Purchase Plan		213
Net cash provided by financing activities	513	35,809
Effect of exchange rate changes on cash and cash equivalents	143	427
Net (decrease) increase in cash and cash equivalents	(17,908)	47,332
Cash and cash equivalents at beginning of period	78,889	30,753
Cash and cash equivalents at end of period	60,981	78,085
Supplemental disclosure of total cash, cash equivalents and restricted cash:
Cash and cash equivalents at end of period	60,981	78,085
Restricted cash at end of period	6,862	65
Total cash, cash equivalents and restricted cash at end of period	$ 67,843	$ 78,150

Nature of Business	6 Months Ended
Nature of Business	Jun. 30, 2016
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 periods 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, 2015 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, 2015.

Correction of Accounting Error in Prior Period

6 Months Ended

Jun. 30, 2016

Correction of Accounting Error in Prior Period

Correction of Accounting Error in Prior Period

Note 2. Correction of Accounting Error in Prior Period

Subsequent to March 31, 2016, but prior to filing this Form 10-Q for the quarter ended June 30, 2016, the Company discovered a cumulative error associated with the elimination of profits on sales of inventory to its subsidiaries. This error had no impact upon the Company’s consolidated statement of operations or consolidated statement of cash flows subsequent to the year ended December 31, 2010. The following financial statement line items reported in the Company’s consolidated balance sheets for the years ended December 31, 2015 and 2014 were affected by the correction of this accounting error:


(in thousands)	Previously Reported December 31, 2015			Adjusted December 31, 2015	Effect of Change
Inventory, net	$	115,904	$	109,408	$	(6,496)
Total current assets		236,453		229,957		(6,496)
Total assets		288,280		281,784		(6,496)
Accumulated deficit		(336,209)		(342,705)		(6,496)
Total stockholders' equity		190,260		183,764		(6,496)
Total liabilities and stockholders' equity	$	288,280	$	281,784	$	(6,496)

(in thousands)	Previously Reported December 31, 2014			Adjusted December 31, 2014	Effect of Change
Inventory, net	$	104,063	$	97,567	$	(6,496)
Total current assets		185,135		178,639		(6,496)
Total assets		227,654		221,158		(6,496)
Accumulated deficit		(350,887)		(357,383)		(6,496)
Total stockholders' equity		168,352		161,856		(6,496)
Total liabilities and stockholders' equity	$	227,654	$	221,158	$	(6,496)

This error was associated with transactions occurring prior to September 2010, at which time the Company revised its methodology to compute and eliminate intercompany profits. However, the Company failed to identify and record an entry to eliminate the cumulative error resulting from the prior methodology. This $6.5 million error resulted in an overstatement of inventory and a cumulative understatement of cost of product revenue as of September 2010. Thereafter, the effect was an overstatement of inventory and understatement of accumulative deficit for each subsequent reporting period. The consolidated balance sheets as of December 31, 2015 and 2014 have been revised to reflect the correction of the error through a decrease in inventory and an increase in accumulated deficit of $6.5 million. In the opinion of management, the effect is not material to the consolidated financial position or results of operations for any previously reported period. However, prior year amounts will be revised, as reflected above, in future filings.

1-for-4 Reverse Stock Split	6 Months Ended
1-for-4 Reverse Stock Split	Jun. 30, 2016
1-for-4 Reverse Stock Split
1-for-4 Reverse Stock Split	Note 3. 1-for-4 Reverse Stock Split As of 6:00 PM Eastern Time on June 30, 2016, the Company effected a 1-for-4 reverse stock split of its common stock. The Company continues to be traded under its unchanged symbol “ACLS.” All previously reported common stock share amounts in the accompanying financial statements and related notes have been retroactively adjusted to reflect the reverse stock split. As a result of the reduced number of shares outstanding after the reverse stock split, the stated capital attributable to common stock on the Company’s balance sheet (which consists of the unchanged $0.001 par value per share multiplied by the aggregate number of shares issued and outstanding), has been reduced. Correspondingly, the Company’s additional paid-in capital account, which consists of the difference between its stated capital and the aggregate amount paid to the Company upon issuance of all currently outstanding shares of its common stock, has been credited with the amount by which the stated capital was reduced. The Company’s stockholders’ equity, in the aggregate, remains unchanged. Immediately prior to the effectiveness of the reverse stock split, the Company retired 120,000 shares of common stock held in treasury to the status of authorized and unissued.

Stock-Based Compensation	6 Months Ended
Stock-Based Compensation	Jun. 30, 2016
Stock-Based Compensation
Stock-Based Compensation	Note 4. 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 2015 Annual Report on Form 10-K. The Company recognized stock-based compensation expense of $1.2 million for the three-month period ended June 30, 2016. The Company recognized $1.9 million for the three-month period ended June 30, 2015, which included $1.1 million of expense due to accelerated vesting of equity awards as a result of stock price performance vesting terms. The Company recognized stock-based compensation expense of $2.1 million and $3.1 million for the six-month periods ended June 30, 2016 and 2015, respectively. These amounts include compensation expense related to restricted stock units, non-qualified stock options and stock to be issued to participants under the ESPP. In the three-month and six-month periods ended June 30, 2016, the Company issued 0.1 million and 0.1 million shares of common stock, respectively, in connection with the exercise of stock options resulting in proceeds of $0.4 million and $0.6 million, respectively.

Computation of Net Earnings per Share

6 Months Ended

Jun. 30, 2016

Computation of Net Earnings per Share

Computation of Net Earnings per Share

Note 5. 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 earnings per share amounts presented within our financial statements and related notes and the related basic and diluted weighted average share amounts stated below have been revised to reflect the 1-for-4 reserve stock split described in Note 3 above.

The components of net earnings per share are as follows:


	Three months ended June 30,				Six months ended June 30,
	2016		2015		2016		2015
	(in thousands, except per share data)
Net income available to common stockholders	$	2,937	$	5,883	$	4,885	$	7,751
Weighted average common shares outstanding used in computing basic earnings per share		29,097		28,446		29,066		28,367
Incremental options and RSUs		1,604		1,707		1,541		1,608
Weighted average common shares outstanding used in computing diluted net earnings per share		30,701		30,153		30,607		29,975
Net earnings per share
Basic	$	0.10	$	0.21	$	0.17	$	0.27
Diluted	$	0.10	$	0.20	$	0.16	$	0.26

Diluted weighted average common shares outstanding does not include options, awards and restricted stock units outstanding to purchase 0.9 million and 0.1 million common equivalent shares for the three-month periods ended June 30, 2016 and 2015, respectively, and does not include options and restricted stock units outstanding to purchase 0.9 million and 0.2 million common equivalent shares for the six-month periods ended June 30, 2016 and 2015, respectively, as their effect would have been anti-dilutive.

Accumulated Other Comprehensive Loss

6 Months Ended

Jun. 30, 2016

Accumulated Other Comprehensive Loss

Accumulated Other Comprehensive Loss

Note 6. Accumulated Other Comprehensive Loss

The following table presents the changes in accumulated other comprehensive income (loss), net of tax, by component for the six months ended June 30, 2016:


	Foreign		Defined benefit
	currency		pension plan		Total
	(in thousands)
Balance at December 31, 2015	$	(744)	$	(687)	$	(1,431)
Other comprehensive income and pension reclassification (1)		593		52		645
Balance at June 30, 2016	$	(151)	$	(635)	$	(786)

(1)

The tax effect for pension reclassification was not material to the consolidated financial statements.

- 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

Inventories, net

6 Months Ended

Jun. 30, 2016

Inventories, net

Inventories, net

Note 7. Inventories, net

The components of inventories are as follows:


	June 30,		December 31,
	2016		2015
	(in thousands)
Raw materials	$	73,636	$	72,070
Work in process		28,399		29,219
Finished goods (completed systems)		8,547		8,119
	$	110,582	$	109,408

The value of raw materials shown for December 31, 2015, reflects the correction of an immaterial error discussed in Note. 2.

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 June 30, 2016 and December 31, 2015, inventories are stated net of inventory reserves of $9.6 million and $10.5 million, respectively.

Product Warranty

6 Months Ended

Jun. 30, 2016

Product Warranty

Product Warranty

Note 8. 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:


	Six months ended
	June 30,
	2016		2015
	(in thousands)
Balance at January 1 (beginning of year)	$	3,555	$	1,526
Warranties issued during the period		1,551		2,230
Settlements made during the period		(2,399)		(1,020)
Changes in estimate of liability for pre-existing warranties during the period		520		344
Balance at June 30 (end of period)	$	3,227	$	3,080

Amount classified as current	$	2,958	$	2,886
Amount classified as long-term		269		194
Total warranty liability	$	3,227	$	3,080

Restructuring Charges

6 Months Ended

Jun. 30, 2016

Restructuring Charges.

Restructuring Charges

Note 9. Restructuring Charges

In the first quarter of 2016, due to changes in customer service contracts resulting from a consolidation in our customer base, the Company had severance and other costs related to a reduction in force. Changes in the Company’s restructuring liability, which consist primarily of payments made on obligations of severance and related costs (which obligations are included in amounts reported as other current liabilities), are as follows:


	(in thousands)
Balance at December 31, 2015	$	—
Severance and, related costs		282
Cash payments		(194)
Balance at June 30, 2016	$	88

Fair Value Measurements

6 Months Ended

Jun. 30, 2016

Fair Value Measurements

Fair Value Measurements

Note 10. Fair Value Measurements

Certain of the assets and liabilities 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 Company’s sale leaseback obligation relating to the sale of our corporate headquarters is carried at amortized cost, which approximates fair value based on an implied borrowing rate of 10.65%. The underlying cash flow associated with our lease payments is being applied to both an interest and principal component using the effective interest method over the associated lease term. The liability is categorized as level 3 within the fair value hierarchy.

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


	June 30, 2016
	Fair Value Measurements
	Level 1		Level 2		Level 3		Total
	(in thousands)
Assets
Cash equivalents:
Money market funds	$	43,815	$	—	$	—	$	43,815
Liabilities
Sale leaseback obligation	$	—	$	—	$	47,586	$	47,586


	December 31, 2015
	Fair Value Measurements
	Level 1		Level 2		Level 3		Total
	(in thousands)
Assets
Cash equivalents:
Money market funds	$	65,327	$	—	$	—	$	65,327
Liabilities
Sale leaseback obligation	$	—	$	—	$	47,586	$	47,586

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	6 Months Ended
Financing Arrangements	Jun. 30, 2016
Financing Arrangements
Financing Arrangements	Note 11. Financing Arrangements Sale Leaseback Obligation On January 30, 2015, the Company sold its corporate headquarters facility to Beverly Property Owner LLC, an affiliate of Middleton Partners, based in Northbrook, Illinois, for the purchase price of $48.9 million. As part of the sale, the Company also entered into a 22-year lease agreement with Beverly Property Owner LLC. The sale leaseback is accounted for as a financing arrangement for financial reporting and, as such, the Company has recorded a financing obligation of $47.6 million as of June 30, 2016. 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. This letter of credit is cash collateralized and is classified as restricted cash as of June 30, 2016.

Income Taxes	6 Months Ended
Income Taxes	Jun. 30, 2016
Income Taxes
Income Taxes	Note 12. 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, 2015, the Company had $124.2 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 2016, the statute of limitations associated with a tax position previously taken by the Company expired. The related tax reserve of $0.6 million and accrued interest of $0.3 million that had been recorded were reversed during the six months ended June 30, 2016. See Note 15 for the effect of the adoption of Accounting Standards Update No. 2015-17.

Concentration of Risk	6 Months Ended
Concentration of Risk	Jun. 30, 2016
Concentration of Risk
Concentration of Risk	Note 13. Concentration of Risk For the three months ended June 30, 2016, three customers accounted for 14.8%, 11.7% and 10.4% of consolidated revenue, respectively. For the six months ended June 30, 2016, two customers accounted for 16.4% and 14.1% of consolidated revenue, respectively. For the three months ended June 30, 2015, two customers accounted for 29.9% and 10.0%, of consolidated revenue, respectively. For the six months ended June 30, 2015, one customer accounted for 33.1% of consolidated revenue. At June 30, 2016, three customers accounted for 16.5%, 14.5% and 10.8% consolidated accounts receivable, respectively. At December 31, 2015, three customers accounted for 22.9%, 12.7% and 11.6% of consolidated accounts receivable, respectively.

Contingencies	6 Months Ended
Contingencies	Jun. 30, 2016
Contingencies
Contingencies	Note 14. 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	6 Months Ended
Recent Accounting Guidance	Jun. 30, 2016
Recent Accounting Guidance
Recent Accounting Guidance	Note 15. Recent Accounting Guidance Accounting Standards or Updates Recently Adopted In November 2015, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) No. 2015-17, “Income Taxes (Topic 740): Balance Sheet Classification of Deferred Taxes.” The amendments in this Update require that deferred tax liabilities and assets be classified as noncurrent in a classified statement of financial position. They apply to all entities that present a classified statement of financial position. For public business entities, the amendments in this ASU are effective for financial statements issued for annual periods beginning after December 15, 2016, and interim periods within those annual periods. The Company adopted ASU No. 2015-17 early, effective June 30, 2016, on a prospective basis. As a result, we have presented all deferred tax assets and liabilities as noncurrent on our consolidated balance sheet as of June 30, 2016, reducing current deferred tax assets by $0.2 million, long-term deferred tax assets of $0.3 million and short-term deferred tax liabilities by $0.5 million. The current deferred tax assets and liabilities on our consolidated balance sheet as of December 31, 2015, have not been reclassified. 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 assessing the potential impact the adoption of these standards will have on our financial statements. In July 2015, the FASB issued 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 will change 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 amendments are effective for annual and interim periods beginning after December 15, 2016. We are currently assessing the potential impact the adoption of this standard 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 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. For public business entities, the amendments in this ASU are effective for annual periods beginning after December 15, 2016, and interim periods within those annual periods. Early adoption is permitted for all entities and any entity that elects early adoption must adopt all of the amendments in the same period. We are currently evaluating the impact of ASU 2016-09 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=6510796

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=56949863&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=56949863&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=56949863&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=51655806&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=51655806&loc=d3e725-108305

+ Details

Correction of Accounting Error in Prior Period (Tables)

6 Months Ended

Jun. 30, 2016

Correction of Accounting Error in Prior Period

Schedule of Effect of Error Corrections and Prior Period Adjustments


(in thousands)	Previously Reported December 31, 2015			Adjusted December 31, 2015	Effect of Change
Inventory, net	$	115,904	$	109,408	$	(6,496)
Total current assets		236,453		229,957		(6,496)
Total assets		288,280		281,784		(6,496)
Accumulated deficit		(336,209)		(342,705)		(6,496)
Total stockholders' equity		190,260		183,764		(6,496)
Total liabilities and stockholders' equity	$	288,280	$	281,784	$	(6,496)

(in thousands)	Previously Reported December 31, 2014			Adjusted December 31, 2014	Effect of Change
Inventory, net	$	104,063	$	97,567	$	(6,496)
Total current assets		185,135		178,639		(6,496)
Total assets		227,654		221,158		(6,496)
Accumulated deficit		(350,887)		(357,383)		(6,496)
Total stockholders' equity		168,352		161,856		(6,496)
Total liabilities and stockholders' equity	$	227,654	$	221,158	$	(6,496)

Computation of Net Earnings per Share (Tables)

6 Months Ended

Jun. 30, 2016

Computation of Net Earnings per Share

Schedule of components of net (loss) per share


	Three months ended June 30,				Six months ended June 30,
	2016		2015		2016		2015
	(in thousands, except per share data)
Net income available to common stockholders	$	2,937	$	5,883	$	4,885	$	7,751
Weighted average common shares outstanding used in computing basic earnings per share		29,097		28,446		29,066		28,367
Incremental options and RSUs		1,604		1,707		1,541		1,608
Weighted average common shares outstanding used in computing diluted net earnings per share		30,701		30,153		30,607		29,975
Net earnings per share
Basic	$	0.10	$	0.21	$	0.17	$	0.27
Diluted	$	0.10	$	0.20	$	0.16	$	0.26

Accumulated Other Comprehensive Loss (Tables)

6 Months Ended

Jun. 30, 2016

Accumulated Other Comprehensive Loss

Schedule of changes in accumulated other comprehensive income (loss), net of tax

	Foreign		Defined benefit
	currency		pension plan		Total
	(in thousands)
Balance at December 31, 2015	$	(744)	$	(687)	$	(1,431)
Other comprehensive income and pension reclassification (1)		593		52		645
Balance at June 30, 2016	$	(151)	$	(635)	$	(786)

(1)

The tax effect for pension reclassification was not material to the consolidated financial statements.

Inventories, net (Tables)

6 Months Ended

Jun. 30, 2016

Inventories, net

Schedule of components of inventories


	June 30,		December 31,
	2016		2015
	(in thousands)
Raw materials	$	73,636	$	72,070
Work in process		28,399		29,219
Finished goods (completed systems)		8,547		8,119
	$	110,582	$	109,408

Product Warranty (Tables)

6 Months Ended

Jun. 30, 2016

Product Warranty

Schedule of standard product warranty liability


	Six months ended
	June 30,
	2016		2015
	(in thousands)
Balance at January 1 (beginning of year)	$	3,555	$	1,526
Warranties issued during the period		1,551		2,230
Settlements made during the period		(2,399)		(1,020)
Changes in estimate of liability for pre-existing warranties during the period		520		344
Balance at June 30 (end of period)	$	3,227	$	3,080

Amount classified as current	$	2,958	$	2,886
Amount classified as long-term		269		194
Total warranty liability	$	3,227	$	3,080

Restructuring Charges (Tables)

6 Months Ended

Jun. 30, 2016

Restructuring Charges.

Schedule of changes in restructuring liability


	(in thousands)
Balance at December 31, 2015	$	—
Severance and, related costs		282
Cash payments		(194)
Balance at June 30, 2016	$	88

Fair Value Measurements (Tables)

6 Months Ended

Jun. 30, 2016

Fair Value Measurements

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


	June 30, 2016
	Fair Value Measurements
	Level 1		Level 2		Level 3		Total
	(in thousands)
Assets
Cash equivalents:
Money market funds	$	43,815	$	—	$	—	$	43,815
Liabilities
Sale leaseback obligation	$	—	$	—	$	47,586	$	47,586


	December 31, 2015
	Fair Value Measurements
	Level 1		Level 2		Level 3		Total
	(in thousands)
Assets
Cash equivalents:
Money market funds	$	65,327	$	—	$	—	$	65,327
Liabilities
Sale leaseback obligation	$	—	$	—	$	47,586	$	47,586

Correction of Accounting Error in Prior Period - (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015	Dec. 31, 2014
Error Corrections and Prior Period Adjustments Restatement
Inventory, Net	$ 110,582	$ 109,408
Total current assets	242,703	229,957
Total assets	299,288	281,784
Accumulated deficit	(337,820)	(342,705)
Total stockholders' equity	191,812	183,764
Total liabilities and stockholders' equity	$ 299,288	281,784
Previously Reported
Error Corrections and Prior Period Adjustments Restatement
Inventory, Net		115,904	$ 104,063
Total current assets		236,453	185,135
Total assets		288,280	227,654
Accumulated deficit		(336,209)	(350,887)
Total stockholders' equity		190,260	168,352
Total liabilities and stockholders' equity		288,280	227,654
Adjusted
Error Corrections and Prior Period Adjustments Restatement
Inventory, Net		109,408	97,567
Total current assets		229,957	178,639
Total assets		281,784	221,158
Accumulated deficit		(342,705)	(357,383)
Total stockholders' equity		183,764	161,856
Total liabilities and stockholders' equity		281,784	221,158
Effect of Change
Error Corrections and Prior Period Adjustments Restatement
Inventory, Net		(6,496)	(6,496)
Total current assets		(6,496)	(6,496)
Total assets		(6,496)	(6,496)
Accumulated deficit		(6,496)	(6,496)
Total stockholders' equity		(6,496)	(6,496)
Total liabilities and stockholders' equity		$ (6,496)	$ (6,496)

1-for-4 Reverse Stock Split -(Details)	6 Months Ended
1-for-4 Reverse Stock Split -(Details)	Jun. 30, 2016 $ / shares shares	Dec. 31, 2015 $ / shares
Class of Stock [Line Items]
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Treasury Stock, Shares, Retired \| shares	120,000
Common Stock
Class of Stock [Line Items]
Reverse stock split conversion ratio	0.25
Common stock, par value (in dollars per share)	$ 0.001

Stock-Based Compensation - (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Stock-based compensation
Stock-based compensation expense	$ 1,200	$ 1,900	$ 2,100	$ 3,100
Accelerated compensation expenses		$ 1,100
Common stock, shares issued	29,134,000		29,134,000		29,025,000
Proceeds from exercise of stock options			$ 556	$ 1,665
Common Stock
Stock-based compensation
Common stock, shares issued	100,000		100,000
Proceeds from exercise of stock options	$ 400		$ 600
2000 Stock Plan
Stock-based compensation
Number of shares of common stock available for future grant	0		0

Computation of Net Earnings per Share (Details) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016 USD ($) $ / shares shares	Jun. 30, 2015 USD ($) $ / shares shares	Jun. 30, 2016 USD ($) $ / shares shares	Jun. 30, 2015 USD ($) $ / shares shares
Computation of Net Earnings per Share
Net income available to common stockholders \| $	$ 2,937	$ 5,883	$ 4,885	$ 7,751
Weighted average common shares outstanding used in computing basic earnings per share	29,097	28,446	29,066	28,367
Incremental options and RSUs	1,604	1,707	1,541	1,608
Weighted average common shares outstanding used in computing diluted net earnings per share	30,701	30,153	30,607	29,975
Net earnings per share
Basic \| $ / shares	$ 0.10	$ 0.21	$ 0.17	$ 0.27
Diluted \| $ / shares	$ 0.10	$ 0.20	$ 0.16	$ 0.26
Weighted Average Number Diluted Shares Outstanding Adjustment, Total	900	100	900	200
Common Stock
Computation of Net Earnings per Share
Reverse stock split conversion ratio			0.25

Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Changes in accumulated other comprehensive income, net of tax
Balance at the beginning of period			$ (1,431)
Other comprehensive income and pension reclassification	$ (430)	$ 348	645	$ (643)
Balance at the end of period	(786)		(786)
Foreign currency
Changes in accumulated other comprehensive income, net of tax
Balance at the beginning of period			(744)
Other comprehensive income and pension reclassification			593
Balance at the end of period	(151)		(151)
Defined benefit pension plan
Changes in accumulated other comprehensive income, net of tax
Balance at the beginning of period			(687)
Other comprehensive income and pension reclassification			52
Balance at the end of period	$ (635)		$ (635)

- Definition

Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

+ References + Details

Inventories, net (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Inventories, net
Raw materials	$ 73,636	$ 72,070
Work in process	28,399	29,219
Finished goods (completed systems)	8,547	8,119
Inventories, net	110,582	109,408
Inventory reserves	$ 9,600	$ 10,500

Product Warranty (Details) - USD ($) $ in Thousands	6 Months Ended
Product Warranty (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Dec. 31, 2015	Jun. 30, 2015
Product Warranty
Product warranty period	1 year
Changes in standard product warranty liability
Balance at the beginning of the period	$ 3,555	$ 1,526
Warranties issued during the period	1,551	2,230
Settlements made during the period	(2,399)	(1,020)
Changes in estimate of liability for pre-existing warranties during the period	520	344
Balance at the end of the period	3,227	3,080
Product warranty classification
Amount classified as current			$ 2,958	$ 3,363	$ 2,886
Amount classified as long-term			269		194
Total warranty liability	$ 3,555	$ 1,526	$ 3,227	$ 3,555	$ 3,080

Restructuring Charges (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Restructuring Charges (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Changes in restructuring liability
Severance and, related costs	$ 8	$ 282	$ 18
Severance
Changes in restructuring liability
Severance and, related costs		282
Cash payments		(194)
Balance at the end of the period		$ 88

Fair Value Measurements (Details) - USD ($) $ in Thousands	6 Months Ended
Fair Value Measurements (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Sale leaseback obligation
Fair Value Measurements
Implicit interest rate on associated cash flows	10.65%
Recurring \| Total \| Sale leaseback obligation
Fair Value Measurements
Sale leaseback obligation	$ 47,586	$ 47,586
Recurring \| Money market accounts \| Total
Fair Value Measurements
Money market funds	43,815	65,327
Recurring \| Level 1 \| Money market accounts
Fair Value Measurements
Money market funds	43,815	65,327
Recurring \| Level 3 \| Sale leaseback obligation
Fair Value Measurements
Sale leaseback obligation	$ 47,586	$ 47,586

Financing Arrangements (Details) - USD ($) $ in Thousands	Jan. 30, 2015	Jun. 30, 2016	Dec. 31, 2015
Financing Arrangements
Sale leaseback obligation		$ 47,586	$ 47,586
Beverly Property Owner LLC \| Sale leaseback obligation \| Buildings
Financing Arrangements
Purchase price	$ 48,900
Lease term	22 years
Sale leaseback obligation		47,600
Security deposit		$ 5,900

Income Taxes (Details) - USD ($) $ in Millions	6 Months Ended
Income Taxes (Details) - USD ($) $ in Millions	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015
Income Taxes
Deferred tax assets valuation allowance			$ 124.2
Percentage of valuation allowance	100.00%
Deferred tax assets, net of valuation allowance	$ 0.0
Related tax reserve		$ (0.6)
Accrued interest		$ (0.3)

Concentration of Risk (Details) - customer	3 Months Ended		6 Months Ended		12 Months Ended
Concentration of Risk (Details) - customer	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Revenue \| Customer concentration risk \| One customer
Concentration of risk
Number of customers	3	2	2	1
Percentage of concentration risk		29.90%	16.40%	33.10%
Revenue \| Customer concentration risk \| Second customer
Concentration of risk
Number of customers	3	2	2
Percentage of concentration risk		10.00%	14.10%
Revenue \| Customer concentration risk \| Third customer
Concentration of risk
Number of customers	3
Consolidated accounts receivable \| Customer concentration risk \| One customer
Concentration of risk
Number of customers			3		3
Consolidated accounts receivable \| Customer concentration risk \| Second customer
Concentration of risk
Number of customers			3		3
Consolidated accounts receivable \| Customer concentration risk \| Third customer
Concentration of risk
Number of customers			3		3
Consolidated accounts receivable \| Credit concentration risk \| One customer
Concentration of risk
Percentage of concentration risk	14.80%		16.50%		22.90%
Consolidated accounts receivable \| Credit concentration risk \| Second customer
Concentration of risk
Percentage of concentration risk	11.70%		14.50%		12.70%
Consolidated accounts receivable \| Credit concentration risk \| Third customer
Concentration of risk
Percentage of concentration risk	10.40%		10.80%		11.60%

Recent Accounting Guidance (Details) - ASU No. 2015-17 - Adjusted $ in Millions	Jun. 30, 2016 USD ($)
Recent Accounting Guidance
Current deferred tax assets	$ (0.2)
Long-term deferred tax assets	(0.3)
Short-term deferred tax liabilities	$ (0.5)