Ultra Clean (UCTT) 10-Q 4 Nov 15 2015 Q3 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	9 Months Ended
	Sep. 25, 2015	Oct. 23, 2015
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 25, 2015
Document Fiscal Year Focus	2,015
Document Fiscal Period Focus	Q3
Trading Symbol	UCTT
Entity Registrant Name	Ultra Clean Holdings, Inc.
Entity Central Index Key	1,275,014
Current Fiscal Year End Date	--01-01
Entity Filer Category	Accelerated Filer
Entity Common Stock, Shares Outstanding		32,254,217

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 25, 2015	Dec. 26, 2014
Current assets:
Cash and cash equivalents	$ 59,783	$ 78,997
Accounts receivable, net of allowance of $132 and $81 in 2015 and 2014, respectively	57,534	61,817
Inventory	75,564	56,850
Deferred tax assets, net of valuation allowance	3,976	3,777
Prepaid expenses and other	8,522	7,006
Total current assets	205,379	208,447
Equipment and leasehold improvements, net	16,968	10,841
Goodwill	84,495	55,918
Purchased intangibles, net	44,952	16,824
Deferred tax assets, net of valuation allowance	3,607	3,445
Other non-current assets	705	667
Total assets	356,106	296,142
Current liabilities:
Bank borrowings	11,207	9,541
Accounts payable	47,503	48,944
Accrued compensation and related benefits	5,882	5,308
Deferred rent, current portion	562	245
Other current liabilities	5,371	2,130
Total current liabilities	70,525	66,168
Bank borrowings, net of current portion	65,716	38,614
Deferred tax liability	1,743	105
Deferred rent and other liabilities	3,283	2,703
Total liabilities	$ 141,267	$ 107,590
Commitments and contingencies (See Note 9)
Stockholders' equity:
Preferred stock - $0.001 par value, 10,000,000 authorized; none outstanding
Common stock - $0.001 par value, 90,000,000 authorized; 32,251,550 and 29,562,338 shares issued and outstanding in 2015 and 2014, respectively	$ 32	$ 30
Additional paid-in capital	174,390	153,141
Common shares held in treasury, at cost, 601,944 shares in 2015 and 2014	(3,337)	(3,337)
Retained earnings	43,774	38,718
Accumulated other comprehensive income	(20)
Total stockholders' equity	214,839	188,552
Total liabilities and stockholders' equity	$ 356,106	$ 296,142

Condensed Consolidated Balance3

Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Sep. 25, 2015	Dec. 26, 2014
Statement of Financial Position [Abstract]
Accounts receivable, allowance	$ 132	$ 81
Preferred stock, par value	$ 0.001	$ 0.001
Preferred stock, shares authorized	10,000,000	10,000,000
Preferred stock, shares outstanding	0	0
Common stock, par value	$ 0.001	$ 0.001
Common stock, shares authorized	90,000,000	90,000,000
Common stock, shares issued	32,251,550	29,562,338
Common stock, shares outstanding	32,251,550	29,562,338
Treasury stock, shares	601,944	601,944

Condensed Consolidated Statemen

Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 25, 2015	Sep. 26, 2014	Sep. 25, 2015	Sep. 26, 2014
Income Statement [Abstract]
Sales	$ 122,816	$ 117,041	$ 365,683	$ 393,942
Cost of goods sold	103,868	106,734	307,994	339,172
Gross profit	18,948	10,307	57,689	54,770
Operating expenses:
Research and development	2,352	1,806	7,319	5,371
Sales and marketing	2,844	2,493	8,494	7,746
General and administrative	10,673	9,971	32,721	28,395
Total operating expenses	15,869	14,270	48,534	41,512
Income (loss) from operations	3,079	(3,963)	9,155	13,258
Interest and other income (expense), net	(756)	(437)	(2,071)	(1,520)
Income (loss) before provision for income taxes	2,323	(4,400)	7,084	11,738
Income tax provision	647	862	2,028	3,913
Net income (loss)	$ 1,676	$ (5,262)	$ 5,056	$ 7,825
Net income (loss) per share:
Basic	$ 0.05	$ (0.18)	$ 0.16	$ 0.27
Diluted	$ 0.05	$ (0.18)	$ 0.16	$ 0.26
Shares used in computing net income (loss) per share:
Basic	31,993	29,477	31,359	29,242
Diluted	32,155	29,477	31,653	29,912

Condensed Consolidated Stateme5

Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 25, 2015	Sep. 26, 2014	Sep. 25, 2015	Sep. 26, 2014
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 1,676	$ (5,262)	$ 5,056	$ 7,825
Other comprehensive income (loss):
Change in foreign currency translation	67		67
Cash flow hedges:
Change in fair value of derivatives	(91)		(91)
Adjustment for net (gains) losses realized and included in net income	4		4
Total change in unrealized (gains) losses on derivative instruments	(87)		(87)
Total other comprehensive loss	(20)		(20)
Total comprehensive income (loss)	$ 1,656	$ (5,262)	$ 5,036	$ 7,825

Condensed Consolidated Stateme6

Condensed Consolidated Statements of Cash Flows $ in Thousands	9 Months Ended
	Sep. 25, 2015USD ($)	Sep. 26, 2014USD ($)
Cash flows from operating activities:
Net income	$ 5,056	$ 7,825
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	3,447	2,248
Amortization of finite lived intangibles	4,042	3,663
Amortization of debt issuance costs	790	366
Stock-based compensation	2,607	3,169
Excess tax benefit from stock-based compensation	809
Changes in assets and liabilities, net of effects of acquisitions:
Accounts receivable	7,416	9,991
Inventory	(11,071)	8,589
Prepaid expenses and other	(1,300)	(1,808)
Deferred income taxes	(196)	1,810
Other non-current assets	(12)	209
Accounts payable	(8,180)	(11,375)
Accrued compensation and related benefits	132	(659)
Income taxes payable	(809)
Other liabilities	1,712	151
Net cash provided by operating activities	4,443	24,179
Cash flows from investing activities:
Payments made in connection with business acquisitions, net	(44,495)
Purchases of equipment and leasehold improvements	(5,196)	(2,066)
Disposal of equipment and leasehold improvements		143
Net cash used in investing activities	(49,691)	(1,923)
Cash flows from financing activities:
Proceeds from bank borrowings	76,981	35,500
Proceeds from issuance of common stock	2,307	1,833
Principal payments on bank borrowings	(51,509)	(43,500)
Payments of debt issuance costs	(611)
Excess tax benefit from stock-based compensation	(809)
Employees' taxes paid upon vesting of restricted stock units	(331)	(1,357)
Net cash provided (used) in financing activities	26,028	(7,524)
Effect of exchange rate changes on cash and cash equivalents	6
Net increase (decrease) in cash	(19,214)	14,732
Cash and cash equivalents at beginning of period	78,997	60,415
Cash and cash equivalents at end of period	59,783	75,147
Cash paid during the period:
Income taxes paid	2,611	2,942
Income tax refunds		1,356
Interest	1,776	1,625
Non-cash activities:
Fair value of common shares issued for acquisition	17,661
Fair value of earn-out payments related to Miconex acquisition	1,280
Equipment and leasehold improvements purchased included in accounts payable	$ 3,531	$ 37

Organization and Significant Ac

Organization and Significant Accounting Policies	9 Months Ended
	Sep. 25, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization and Significant Accounting Policies	1. Organization and Significant Accounting Policies Organization The Company is a global leader in the design, engineering, and manufacture of production tools, modules and subsystems for the semiconductor capital equipment industry and industry segments with similar requirements including consumer, medical and flat panel display. The Company focuses on providing specialized engineering and manufacturing solutions for these applications. The Company enables its customers to realize lower manufacturing costs and reduced design-to-delivery cycle times while maintaining high quality standards. The Company provides its customers with complete solutions that combine its expertise in design, scan, assembly, test and component characterization. The Company’s customers value its highly flexible global manufacturing operations, its excellence in quality control and its scale and financial stability. The Company’s global footprint enables the Company to reduce manufacturing costs and design-to-delivery cycle times and maintains high quality standards for the Company’s customers. The Company believes that these characteristics allow the Company to provide global solutions for its customers’ growing product demands. The Company ships the majority of its products to U.S. registered customers with locations both in and outside the U.S. In addition to its U.S. manufacturing capabilities, the Company manufactures products in its Asian facilities to support local and U.S. based customers. The Company conducts its operating activities primarily through its wholly owned subsidiaries, Ultra Clean Technology Systems and Service, Inc., AIT LLC, Ultra Clean Technology (Shanghai) Co., Ltd., Ultra Clean Micro-Electronics Equipment (Shanghai) Co., Ltd., Ultra Clean Asia Pacific, Pte Ltd. (Singapore), Marchi and Miconex. The Company’s international sales represented 35.6% and 30.7% of total sales for the three months ended September 25, 2015 and September 26, 2014, respectively, and 33.3% and 29.5% of total sales for the nine months ended September 25, 2015 and September 26, 2014, respectively. See Note 10 to the Company’s Condensed Consolidated Financial Statements for further information about the Company’s geographic areas. Basis of Presentation Principles of Consolidation Foreign Currency Translation and Remeasurement Use of Accounting Estimates Certain Significant Risks and Uncertainties Concentration of Credit Risk Significant sales to customers Three months ended Nine months ended September 25, September 26, September 25, September 26, Lam Research Corporation 49.4 % 39.3 % 50.4 % 36.0 % Applied Materials, Inc. 26.4 20.9 27.1 22.0 ASM International * 13.9 * 17.0 Total 75.8 % 74.1 % 77.5 % 75.0 % * Total sales for the period are below 10%. Three customers’ accounts receivable balances, Applied Materials, Inc., Lam Research Corporation and ASM International, were individually greater than 10% of accounts receivable as of September 25, 2015 and December 26, 2014 and in the aggregate represented approximately 79.9% and 73.7% of accounts receivable, respectively. Fair Value of Measurements — Level 1 — Observable inputs that reflect quoted prices (unadjusted) for identical assets or liabilities in active markets. Level 2 — Inputs that are based upon quoted prices for similar instruments in active markets, quoted prices for identical or similar instruments in markets that are not active, and model-based valuation techniques for which all significant inputs are observable in the market or can be derived from observable market data. Where applicable, these models project future cash flows and discount the future amounts to a present value using market-based observable inputs including interest rate curves, foreign exchange rates, and credit ratings. Level 3 — Unobservable inputs that are supported by little or no market activities. The fair value hierarchy requires an entity to maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value. Derivative Financial Instruments Inventories Inventory write downs inherently involve judgments as to assumptions about expected future demand and the impact of market conditions on those assumptions. Although the Company believes that the assumptions it used in estimating inventory write downs are reasonable, significant changes in any one of the assumptions in the future could produce a significantly different result. There can be no assurances that future events and changing market conditions will not result in significant increases in inventory write downs. Equipment and Leasehold Improvements Product Warranty — Nine months ended September 25, 2015 September 26, 2014 Beginning balance $ 109 $ 101 Change in reserve 300 97 Warranty costs incurred in the current period (225 ) (85 ) Ending balance $ 184 $ 113 Income Taxes The Company continued to maintain a full valuation allowance on its California, Oregon, and one of its Chinese subsidiaries deferred tax amounts as of September 25, 2015 totaling $3.2 million. Income tax positions must meet a more likely than not recognition threshold to be recognized. Income tax positions that previously failed to meet the more likely than not threshold are recognized in the first subsequent financial reporting period in which that threshold is met. Previously recognized tax positions that no longer meet the more likely than not threshold are derecognized in the first subsequent financial reporting period in which that threshold is no longer met. The Company recognizes potential accrued interest and penalties related to unrecognized tax benefits within the consolidated statements of income as income tax expense. The calculation of tax liabilities involves significant judgment in estimating the impact of uncertainties in the application of complex tax laws. Resolution of these uncertainties in a manner inconsistent with the Company’s expectations could have a material impact on its results of operations and financial position. Management believes that it has adequately provided for any adjustments that may result from these examinations; however, the outcome of tax audits cannot be predicted with certainty. The determination of the Company’s tax provision is subject to judgments and estimates. Revenue Recognition Research and Development Costs Net Income per Share Segments Business Combinations Stock-Based Compensation Expense The Company maintains stock-based compensation plans which allow for the issuance of equity-based awards to executives, directors and certain employees. These equity-based awards include stock options, restricted stock awards (“RSAs”) and restricted stock units (“RSUs”) which can be either time-based or performance-based. The Company also maintains an employee stock purchase plan that provides for the issuance of shares to all eligible employees of the Company at a discounted price. Stock-based compensation expense includes compensation costs related to estimated fair values of stock options and awards granted. The estimated fair value of the Company’s equity-based awards, net of expected forfeitures, is amortized on a straightline basis over the awards’ vesting period, typically four years for stock options, three years for RSUs and one year for RSAs, and is adjusted for subsequent changes in estimated forfeitures related to all equity-based awards and performance as it relates to performance-based RSUs. The Company applies the fair value recognition provisions based on the FASB’s guidance regarding stock-based compensation. The exercise price of each stock option equals the market price of the Company’s stock on the date of grant. Most options are scheduled to vest over four years and expire no later than ten years from the grant date. The fair value of each option grant is estimated on the date of grant using the Black-Scholes option pricing model. The determination of the fair value of share-based payment awards on the date of grant using an option-pricing model is affected by the Company’s stock price as well as assumptions regarding certain variables. These variables include the expected term of the awards; the Company’s expected stock price volatility over the term of the awards, actual and projected employee stock option exercise behaviors, the risk-free interest rate and expected dividends. The Company estimates the expected term of share-based awards granted based on the Company’s historical option term experience. The Company estimates the volatility of its common stock based upon the Company’s historical stock price volatility over the length of the expected term of the options. The Company bases the risk-free interest rate that it uses in the option valuation model on U.S. Treasury zero-coupon issues with remaining maturities similar to the expected term of the options. The Company does not anticipate paying any cash dividends in the foreseeable future and therefore uses an expected dividend yield of zero in the option valuation model. The Company is required to estimate forfeitures at the time of grant and revise those estimates in subsequent periods if actual forfeitures differ from those estimates. The Company uses historical data to estimate pre-vesting option forfeitures and records share-based compensation expense only for those awards that are expected to vest. The Company also considers, each quarter, whether there have been any significant changes in facts and circumstances that would affect its estimated forfeiture rate. Stock Options Stock option activity for the nine months ended September 25, 2015: Shares Weighted Weighted Aggregate Outstanding at December 26, 2014 853,551 $ 8.87 1.35 $ 1,798 Granted — — Exercised (339,303 ) $ 6.48 Canceled (197,600 ) $ 11.18 Outstanding at September 25, 2015 316,648 $ 10.01 2.31 $ 234,133 Options exercisable at September 25, 2015 316,648 $ 10.01 2.31 $ 234,133 There were no options granted by the Company during either of the nine month periods ended September 25, 2015 and September 26, 2014. As of September 25, 2015, there was no stock-based compensation expense attributable to stock options as all outstanding options were fully vested. Employee Stock Purchase Plan The Company also maintains an employee stock purchase plan (“ESPP”) that provides for the issuance of shares to all eligible employees of the Company at a discounted price. Under the ESPP, substantially all employees may purchase the Company’s common stock through payroll deductions at a price equal to 95 percent of the fair market value of the Company’s stock at the end of each applicable purchase period. Restricted Stock Units and Restricted Stock Awards The Company grants RSUs to employees and RSAs to non-employee directors as part of the Company’s long term equity compensation plan. Restricted Stock Units During the quarter ended March 27, 2015, the Company granted 456,500 RSU’s, with a weighted average fair value of $8.68 per share, and granted 90,500 performance stock units with a weighted average fair value of $8.35 per share. During the quarter ended June 26, 2015, the Company granted 134,000 RSU’s, with a weighted average fair value of $6.53 per share. The Company granted 103,500 RSU’s with a weighted average fair value of $6.71 per share during the quarter ended September 25, 2015. During the nine months ended September 25, 2015, 39,938 vested shares were withheld to satisfy withholding tax obligations, resulting in the net issuance of 337,443 shares. As of September 25, 2015, approximately $ 6.8 million of stock-based compensation cost, net of estimated forfeitures, related to RSU’s remains to be amortized over a weighted average period of 2.1 years. As of September 25, 2015, a total of 1,277,741 RSU’s remain outstanding with an aggregate fair value of $6.8 million and a weighted average remaining contractual term of 1.3 years. Restricted Stock Awards The following table summarizes the Company’s RSU and RSA activity for the nine months September 25, 2015: Shares Aggregate Unvested restricted stock units and restricted stock awards at December 26, 2014 1,078,279 $ 9,673 Granted 840,500 Vested (424,381 ) Forfeited (216,657 ) Unvested restricted stock units and restricted stock awards at September 25, 2015 1,277,741 $ 6,800 Vested and expected to vest restricted stock units and restricted stock awards at September 25, 2015 1,076,186 $ 5,686 The following table shows the Company’s stock-based compensation expense included in the condensed consolidated statements of operations (in thousands): Three months ended Nine months ended September 25, 2015 September 26, 2014 September 25, 2015 September 26, 2014 Cost of sales (1) $ 304 $ 267 $ 908 $ 862 Research and development 658 100 1,247 245 Sales and marketing 49 119 150 334 General and administrative 103 671 302 1728 1,114 1,157 2,607 3,169 Income tax benefit (310 ) (226 ) (746 ) (1,056 ) Net stock-based compensation expense $ 804 $ 931 $ 1,861 $ 2,113 (1) Stock-based compensation expenses capitalized in inventory for the three and nine month periods ended September 25, 2015 and September 26, 2014 were considered immaterial. Recent Accounting Pronouncements In September 2015, the Financial Accounting Standards Board (FASB) issued updated guidance on the accounting for purchase accounting adjustments determined during the measurement period (i.e. up to one year after the acquisition). The new guidance requires an acquirer to recognize such adjustments in the reporting period in which the adjustment amounts are determined. Previously, such adjustments were required to be recorded on a retrospective basis. The Company has elected to early adopt this guidance beginning in the third quarter 2015 on a prospective basis. The adoption of this guidance did not have a significant impact on the condensed consolidated financial statements. In July 2015, the FASB issued authoritative guidance that requires inventory to be measured at the lower of cost and net realizable value instead of at lower of cost or market. This guidance does not apply to inventory that is measured using last-in, first out (LIFO) or the retail inventory method but applies to all other inventory including those measured using first-in, first-out (FIFO) or the average cost method. The authoritative guidance will be effective for the Company in the first quarter of fiscal 2018 and should be applied prospectively. Early adoption is permitted as of the beginning of an interim or annual reporting period. The Company is currently evaluating the effect of this new guidance on the Company’s consolidated financial statements. In April 2015, the FASB issued authoritative guidance that requires debt issuance costs to be presented in the balance sheet as a direct deduction from the carrying amount of the related debt liability, consistent with debt discounts. The authoritative guidance is effective for the Company in the first quarter of fiscal 2017 and should be applied retrospectively. Early adoption is permitted. The adoption of this guidance is not expected to have a significant impact on the Company’s consolidated financial statements.

Financial Instruments

Financial Instruments	9 Months Ended
	Sep. 25, 2015
Investments, All Other Investments [Abstract]
Financial Instruments	2. Financial Instruments Cash Equivalents The Company has an overnight sweep account invested in money market funds with maturities of less than 90 days from purchase and is thus classified as cash and cash equivalents on the Company’s balance sheet. These money market funds had a carrying value and fair value of $0.3 million at September 25, 2015 based on Level 1 inputs. Derivative Financial Instruments A subsidiary of the Company, Miconex, utilizes foreign currency forward contracts with a local financial institution to reduce the risk that its cash flows and earnings will be adversely affected by foreign currency exchange rate fluctuations. The Company also uses certain interest rate derivative contracts to hedge interest rate exposures on existing floating rate debt. The Company classifies its foreign currency and interest rate derivative contracts primarily within Level 2 of the fair-value hierarchy discussed in Note 1of the Company’s Condensed Consolidated Financial Statements as the valuation inputs are based on quoted prices and market observable data of similar instruments. Cash Flow Hedges In September 2015, the Company entered into an interest rate swap with East West and City National banks with a notional amount of $20.0 million pursuant to which the Company pays the counterparty a fixed rate of 0.99% and receives interest at a variable rate equal to the LIBOR rate the Company is required to pay under its term loan, or 0.2%, as of September 25, 2015. This interest rate swap effectively locks in a fixed interest rate of 3.49% on $20.0 million of the $37.5 million term loan balance outstanding as of September 25, 2015, with a decreasing notional amount based on prorated quarterly principal payments over the remaining period of the term loan. Gains or losses on the effective portion of a cash flow hedge are reflected as a component of AOCI and subsequently recorded to interest income (expense) when the hedged transactions are realized. If the hedged transactions become probable of not occurring, the corresponding amounts in AOCI would be immediately reclassified to interest and other income, net. As of September 25, 2015, the effective portion of the Company’s cash flow hedge before tax effect was $0.1 million, of which $0.1 million is expected to be reclassified from AOCI into earnings within the next 12 months. Non-Designated Derivatives Miconex derivatives are not designated as hedging instruments and consist of: a) forward contracts that Miconex uses to hedge forecasted transactions that are denominated in currencies other than the local currency of Miconex, and b) an interest rate swap with a total notional amount of $0.5 million to convert the variable interest rates on Miconex debt to fixed interest rates. The Company recognizes gains and losses on these contracts, as well any related costs in interest and other income, net. The notional principal of foreign exchange contracts outstanding was $1.3 million as of September 25, 2015 and $0 as of December 26, 2014. The Company records all derivatives in the Condensed Consolidated Balance Sheets at fair value. The Company’s accounting treatment for these derivative instruments is based on its hedge designation. The following tables show the Company’s derivative instruments at gross fair value (in thousands) as of September 25, 2015. There were no derivative instruments as of December 26, 2014. September 25, 2015 Fair Value of Derivatives Designated as Hedge Instruments Fair Value of Derivatives Not Designated as Hedge Instruments Balance Sheet Location Total Fair Value Derivative liabilities Level 2 Foreign exchange contracts Deferred rent and other liabilities $ — $ 12 $ 12 Interest rate swap Deferred rent and other liabilities $ 91 $ 10 $ 101 The effect of derivative instruments in cash flow hedging relationships on income and other comprehensive income (OCI) is summarized below (in thousands): Gains (Losses) Recognized in OCI on Derivatives Before Tax Three Months Ended Nine Months Ended September 25, September 26, September 25, September 26, Derivatives in Cash Flow Hedging Relationship Interest rate swap $ 87 $ — $ 87 $ — Gains Reclassified from AOCI into Income (Effective Portion) Three Months Ended Nine Months Ended Income Statement Location September 25, September 26, September 25, September 26, Derivatives in Cash Flow Hedging Relationship Interest rate swap Interest and other income (expense), net $ 4 $ — $ 4 $ — There were no gains (losses) recognized in income on derivatives that are excluded from the effectiveness testing and ineffective portion of the cash flow hedge for the three and nine months ended September 25, 2015 and September 26, 2014. The effect of derivative instruments not designated as hedging instruments on income for the three and nine months ended September 25, 2015 and September 26, 2014 is immaterial to the financial statements.

Balance Sheet Information

Balance Sheet Information	9 Months Ended
	Sep. 25, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Balance Sheet Information	3. Balance Sheet Information Inventory consisted of the following (in thousands): September 25, 2015 December 26, 2014 Raw materials $ 60,484 $ 45,294 Work in process 18,741 14,103 Finished goods 4,111 3,922 83,336 63,319 Reserve for excess and obsolete (7,772 ) (6,469 ) Total $ 75,564 $ 56,850 Equipment and leasehold improvements, net, consisted of the following (in thousands): September 25, 2015 December 26, 2014 Computer equipment and software $ 10,989 $ 9,299 Furniture and fixtures 6,076 2,582 Machinery and equipment 15,467 10,774 Leasehold improvements 12,853 12,847 45,385 35,502 Accumulated depreciation (28,417 ) (24,661 ) Total $ 16,968 $ 10,841

Acquisitions

Acquisitions	9 Months Ended
	Sep. 25, 2015
Business Combinations [Abstract]
Acquisitions	4. Acquisitions Miconex On July 31, 2015, the Company acquired 100.0% of the shareholding interest of Miconex, a limited liability company incorporated under the laws of the Czech Republic and a provider of advanced precision fabrication of plastics, primarily for the semiconductor industry. This acquisition is expected to expand the Company’s capabilities with existing customers. Pursuant to the purchase agreement, the Company paid $15.0 million in cash and issued 500,000 shares of the Company’s common stock. In addition, the former owners of Miconex are entitled to up to $4.0 million of potential cash “earn-out” payments over a two-year period following closing, based on Miconex’s achievement of specified performance targets based on EBIT (earnings before interest and taxes) pursuant to the provisions of the purchase agreement. The preliminary estimated acquisition price of Miconex for purposes of the Company’s preliminary purchase price allocation was determined to be $20.1 million, which includes the cash payment of $15.0 million, the stock consideration valued at $3.8 million, and the fair value of the potential earn-out payments of approximately $1.3 million. The fair value of the common stock issued was determined based on the average of the high and low trading prices per share of the Company’s common stock on the acquisition date of approximately $7.64 per share. The fair value of the earn-out payments at the acquisition date was determined providing risk adjusted earnings projections using the Monte Carlo Simulation. These inputs are not observable in the market and thus represent a Level 3 measurement as discussed in Note 1 of the Company’s Condensed Consolidated Financial Statements. As of September 25, 2015, there were no significant changes in the fair value of the earn-out. The Company preliminarily allocated the purchase price of Miconex to the tangible and intangible assets acquired and liabilities assumed based on their estimated fair values. The excess of the purchase price over the aggregate fair value was recorded as goodwill. Goodwill associated with this acquisition is primarily attributable to future technology, market presence and knowledgeable and experienced workforce. The fair value assigned to identifiable intangible assets acquired was determined using the income approach taking into account the Company’s consideration of a number of inputs, including an independent third party analysis that was based upon estimates and assumptions provided by the Company. These estimates and assumptions were determined through established and generally accepted valuation techniques. The primary areas of the preliminary purchase price allocation yet to be finalized relate to the fair value of certain tangible assets and liabilities acquired, income and non-income based taxes and residual goodwill. During the measurement period, which can be no more than one year from the date of acquisition, we expect to continue to obtain information to assist us in determining the final fair value of the net assets acquired at the acquisition date. The preliminary purchase price for this acquisition has been allocated as follows: Fair Market Values (in thousands) Cash and cash equivalents $ 239 Accounts receivable 3,065 Inventories 6,198 Deferred tax assets 196 Prepaid expenses and other 214 Equipment and leasehold improvements 428 Goodwill 10,197 Purchased intangible assets 8,800 Total assets acquired 29,337 Bank borrowings (3,027 ) Accounts payable (3,509 ) Accrued compensation and related benefits (432 ) Other current liabilities (576 ) Deferred tax liability (1,672 ) Other liabilities (24 ) Total liabilities assumed (9,240 ) Purchase price allocated $ 20,097 Useful Life Purchased Intangible (In years) (In thousands) Customer relationships 7.5 $ 8,800 Goodwill is not amortized but is reviewed for impairment at least annually and whenever events or changes in circumstances indicate that the carrying value of an asset may not be recoverable. Although goodwill is not amortized for financial accounting purposes, it is amortized in its entirety for tax purposes over fifteen years. The results of operations for the Company for the three and nine month periods ended September 25, 2015 include two months of operating activity for Miconex. For the three and nine months ended September 25, 2015, net sales of approximately $5.2 million and operating income of approximately $0.4 million attributable to Miconex were included in the consolidated results of operations. For the three and nine months ended September 25, 2015, results of operations included charges of $0.2 million attributable to amortization of purchased intangible assets and $0.4 million of deal costs associated with the acquisition. Deal costs are included in general and administrative expenses in the Company’s Condensed Consolidated Statements of Operations. Marchi On February 5, 2015, the Company acquired 100.0% of the shareholding interest of Marchi, a designer and manufacturer of specialty thermocouples, heaters and temperature controllers, for approximately $29.9 million in cash and 1,437,500 shares of newly issued common stock for a total purchase price of approximately $43.7 million. In addition, the Company incurred approximately $0.2 million of costs related to the acquisition. The Company completed this acquisition primarily in order to expand its capabilities with existing customers and to bring the Company closer to the customer in the design stage of new products and next generation equipment. The Company financed the cash portion of the acquisition by borrowing a total of $29.7 million under a new Credit Agreement. See further discussion of the borrowing arrangements in Note 6 to the Company’s Condensed Consolidated Financial Statements. The Company allocated the preliminary purchase price of Marchi to the tangible assets, liabilities and identifiable intangible assets acquired, based on their estimated fair values. The excess of purchase price over the aggregate fair value was recorded as goodwill. Goodwill associated with the Marchi acquisition is primarily attributable to the future technology, market presence and knowledgeable and experienced workforce. The fair value assigned to identifiable intangible assets acquired was determined using the income approach taking into account the Company’s consideration of a number of inputs, including an independent third party analysis that was based upon estimates and assumptions provided by the Company. These estimates and assumptions were determined through established and generally accepted valuation techniques. The estimated fair value of the tangible and intangible assets acquired was allocated at Marchi’s acquisition date. The primary areas of the preliminary purchase price allocation that are not yet finalized relate to the fair values of inventory, non-income based taxes and residual goodwill. During the measurement period, which can be no more than one year from the date of acquisition, we expect to continue to obtain information to assist us in determining the final fair value of the net assets acquired at the acquisition. The preliminary purchase price for this acquisition has been allocated as follows: Fair Market Values (in thousands) Inventories $ 1,297 Equipment and leasehold improvements 767 Goodwill 18,380 Purchased intangible assets 23,370 Other non-current assets 26 Total assets acquired 43,840 Other liabilities (100 ) Total liabilities assumed (100 ) Purchase price allocated $ 43,740 Useful Life Purchased Intangible (In years) (In thousands) Customer relationships 10 $ 9,900 Trade name 6 1,170 Intellectual properties/know-how 8-12 12,300 Total purchased intangible assets $ 23,370 The results of operations for the Company for the nine month period ended September 25, 2015 include eight full months of operating activity for Marchi. For the three and nine months ended September 25, 2015, net sales of approximately $3.9 million and $10.1 million, respectively and operating income of approximately $1.7 million and $4.4 million, respectively attributable to Marchi were included in the consolidated results of operations. For the three and nine months ended September 25, 2015, results of operations included charges of $0.7 million and $1.7 million, respectively, attributable to amortization of purchased intangible assets and $0.2 million of deal costs associated with the acquisition. Deal costs are included in general and administrative expenses in the Company’s consolidated results of operations. The following unaudited pro forma consolidated results of operations assume the Marchi and Miconex acquisitions were completed as of the beginning of the year of the reporting periods presented (in thousands, except per share amounts): Three Months Ended Nine Months Ended September 25, 2015 September 26, 2014 September 25, 2015 September 26, 2014 Net sales $ 127,348 $ 126,857 $ 386,889 $ 428,703 Net income $ 1,560 $ (4,301 ) $ 6,049 $ 11,414 Basic earnings per share $ 0.05 $ (0.14 ) $ 0.19 $ 0.37 Diluted earnings per share $ 0.05 $ (0.14 ) $ 0.19 $ 0.36 The unaudited pro forma results above include adjustments related to the purchase price allocation and financing of the Marchi and Miconex acquisitions, primarily to increase amortization for the identifiable intangible assets, to increase interest expense for the additional debt incurred to complete the acquisition of Marchi, to reflect the related income tax effect of the pro forma adjustments and to adjust weighted shares issued as part of the acquisitions. The unaudited pro forma results for the three and nine months ended September 25, 2015 include acquisitions related costs of $0.6 million which are not expected to occur in future quarters. The unaudited pro forma condensed combined financial information has been prepared by management for illustrative purposes only and are not necessarily indicative of the condensed consolidated financial position or results of income in future periods or the results that actually would have been realized had UCT, Marchi and Miconex been a combined company during the specified periods. The unaudited pro forma condensed combined financial information does not reflect any operating efficiencies and/or cost savings that we may achieve with respect to the combined companies, or any liabilities that may result from integration activities.

Goodwill and Purchased Intangib

Goodwill and Purchased Intangible Assets	9 Months Ended
	Sep. 25, 2015
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Purchased Intangible Assets	5. Goodwill and Purchased Intangible Assets The Company’s methodology for allocating the purchase price relating to acquisitions is determined through established and generally accepted valuation techniques. Goodwill is measured as the excess of the cost of the acquisition over the sum of the amounts assigned to tangible and identifiable intangible assets acquired less liabilities assumed. The Company assigns assets acquired (including goodwill) and liabilities assumed to one or more reporting units as of the date of acquisition. Typically, acquisitions relate to a single reporting unit and thus do not require the allocation of goodwill to multiple reporting units. If the products obtained in an acquisition are assigned to multiple reporting units, the goodwill is distributed to the respective reporting units as part of the purchase price allocation process. Goodwill and purchased intangible assets with indefinite useful lives are not amortized, but are reviewed for impairment at least annually and whenever events or changes in circumstances indicate that the carrying value of an asset may not be recoverable. The Company regularly monitors current business conditions and other factors including, but not limited to, adverse industry or economic trends and lower projections of profitability that may impact future operating results. To test goodwill for impairment, the Company first performs a qualitative assessment to determine whether it is more likely than not that the fair value of a reporting unit is less than its carrying value. If it is concluded that this is the case, the Company then performs the two-step goodwill impairment test. Otherwise, the two-step goodwill impairment test is not required. Under the two-step goodwill impairment test, the Company would in the first step compare the estimated fair value of each reporting unit to its carrying value. The Company determines the fair value of each of its reporting units based on a weighting of income and market approaches. If the carrying value of a reporting unit exceeds its fair value, the Company would then perform the second step of the impairment test in order to determine the implied fair value of the reporting unit’s goodwill. If the Company determines that the carrying value of a reporting unit’s goodwill exceeds its implied fair value, the Company would record an impairment charge equal to the difference. The evaluation of goodwill and intangible assets for impairment requires the exercise of significant judgment. In the event of future changes in business conditions, the Company will be required to reassess and update its forecasts and estimates used in future impairment analyses. If the results of these future analyses are lower than current estimates, a material impairment charge may result at that time. Details of goodwill and other intangible assets were as follows (in thousands): September 25, 2015 December 26, 2014 Goodwill Intangible Assets Total Goodwill Intangible Assets Total Carrying amount $ 84,495 $ 44,952 $ 129,447 $ 55,918 $ 16,824 $ 72,742 Purchased Intangible Assets Intangible assets are generally recorded in connection with a business acquisition. The Company evaluates the useful lives of its intangible assets each reporting period to determine whether events and circumstances require revising the remaining period of amortization. In addition, the Company reviews indefinite lived intangible assets for impairment when events or changes in circumstances indicate their carrying value may not be recoverable and tests definite lives intangible assets at least annually for impairment. Management considers such indicators as significant differences in product demand from the estimates, changes in the competitive and economic environment, technological advances, and changes in cost structure. Details of purchased intangible assets were as follows (in thousands): As of September 25, 2015 As of December 26, 2014 Gross Gross Carrying Accumulated Carrying Carrying Accumulated Carrying Useful Life Amount Amortization Value Amount Amortization Value (in years) AIT Customer relationships $ 19,000 $ (14,726 ) $ 4,274 $ 19,000 $ (13,011 ) $ 5,989 7 Tradename 1,900 (1,304 ) 596 1,900 (1,081 ) 819 6 Intellectual property/know-how 1,600 (743 ) 857 1,600 (571 ) 1,029 7 Marchi Customer relationships 9,900 (660 ) 9,240 — — — 10 Tradename 1,170 (158 ) 1,012 — — — 6 Intellectual property/know-how 12,300 (919 ) 11,381 — — — 8-12 Miconex Customer relationships 8,800 (195 ) 8,605 — — — 7.5 UCT Tradename 8,987 — 8,987 8,987 — 8,987 * Total $ 63,657 $ (18,705 ) $ 44,952 $ 31,487 $ (14,663 ) $ 16,824 * The Company concluded that the UCT tradename intangible asset life is indefinite and is therefore not amortized but is reviewed for impairment at least annually and whenever events or changes in circumstances indicate that the carrying value of an asset may not be recoverable. The Company amortizes its tradenames for AIT and Marchi and customer relationships intangible asset for AIT using an accelerated method over the estimated economic life of the assets, ranging from 6 to 7 years. The Company amortizes its intellectual property/know-how and customer relationships intangible assets for Marchi and Miconex on a straight-line basis with an estimated economic life of the assets ranging from 7 to 12 years. Amortization expense was approximately $1.6 million and $1.2 million for the three months ended September 25, 2015 and September 26, 2014, respectively and $4.0 million and $3.7 million for the nine months ended September 25, 2015 and September 26, 2014, respectively. Amortization expense is charged to general and administrative. As of September 25, 2015, future estimated amortization expense is expected to be as follows (in thousands): Amortization Expense 2015 (remaining in year) $ 1,648 2016 6,062 2017 5,142 2018 4,582 2019 4,210 Thereafter 14,321 Total $ 35,965

Borrowing Arrangements

Borrowing Arrangements	9 Months Ended
	Sep. 25, 2015
Debt Disclosure [Abstract]
Borrowing Arrangements	6. Borrowing Arrangements Prior to February 5, 2015, the Company had borrowing arrangements with Silicon Valley Bank under a Loan and Security Agreement (the “Loan Agreement”) which included a $40.0 million revolving credit facility (the “Revolver”), maturing on July 3, 2016, and a $40.0 million term loan (the “Term Loan”), maturing on July 3, 2016. The interest rate on the Revolver during the month of January 2015 was 3.75%. On February 2, 2015, the Company entered into a new credit agreement (the “Credit Agreement”) by and among the Company, certain of its subsidiaries and East West Bank and City National Bank (collectively, the “Lenders”). The new credit agreement was amended on April 3, 2015 (as amended, the “Credit Agreement”) to modify certain terms of the agreement. The Credit Agreement provides for a term loan in an aggregate principal amount of $40.0 million (the “New Term Loan”) and a revolving credit facility in an aggregate principal amount of $40.0 million (the “New Revolving Credit Facility”), a letter of credit facility in the aggregate availability amount of $20.0 million (as a sublimit of such New Revolving Credit Facility) (the “L/C Facility”) and a swingline sub-facility in the aggregate availability amount of $5.0 million (as a sublimit of the New Revolving Credit Facility) (together with the Term Loan, the Revolving Credit Facility and the L/C Facility, the “Senior Secured Credit Facility”). On February 2, 2015, the Company borrowed an aggregate of $40.0 million under the New Term Loan and approximately $6.5 million under the New Revolving Credit Facility. The borrowed funds were used to repay the outstanding balance to Silicon Valley Bank as lender under our prior Loan Agreement. The prior Loan Agreement was terminated in connection with this transaction and, as a result, the outstanding balance of the revolver of $31.3 million was classified as long-term debt as of December 26, 2014 in accordance with the terms of the new debt agreement. In addition, the Company expensed the unamortized debt issuance costs of approximately $0.7 million in the first quarter of 2015. On February 5, 2015, in order to finance the acquisition of Marchi, the Company borrowed $29.7 million under the New Revolving Credit Facility. The New Term Loan must be repaid in consecutive quarterly installments of $1.25 million for the first four installments and $2.9 million for the remaining twelve installments, with the first payment made on March 31, 2015, and with the balance of the outstanding principal amount of the New Term Loan due at the final maturity, which is February 2, 2019. The New Revolving Credit Facility is available for the four-year period beginning on February 2, 2015. The Credit Agreement includes customary representations, warranties, covenants and events of default. The Company and certain of its subsidiaries have agreed to secure all of their obligations under the Credit Agreement by granting a first priority lien in substantially all of their respective personal property assets (subject to certain exceptions and limitations). At the Company’s option, borrowings under the New Term Loan and New Revolving Credit Facility (subject to certain limitations) bear interest at either a base rate or at the London Interbank Offered Rate (“LIBOR”) (with the LIBOR being adjusted for certain Eurocurrency reserve requirements, if any, as described in the Credit Agreement), plus, in each case, an applicable margin based on the Company’s consolidated leverage ratio. All loans described above made on February 2, 2015 were initially base rate loans, carrying interest of 3.25%. The effective interest rate will be higher due to the incurrence of certain loan-related costs of $0.6 million that have been treated as a discount on the debt and amortized over the life of the loan. As of September 25, 2015, the interest rates on the outstanding New Term Loan and New Revolving Credit facility were 2.70% (2.5% fixed and 0.2% variable based on LIBOR) and 3.0% fixed, respectively. In order to manage interest rate risk on the variable component of the New Term Loan the Company entered into an interest rate swap with the Lenders in September 2015 with a total notional amount of $20.0 million pursuant to which the Company pays the counterparty a fixed rate of 0.99% and receives interest at a variable rate equal to the LIBOR rate the Company is required to pay under its New Term Loan, or 0.2%, as of September 25, 2015. This interest rate swap effectively locks in a fixed interest rate of 3.49% on $20.0 million of the $37.5 million term loan balance outstanding as of September 25, 2015, with a decreasing notional amount based on prorated quarterly principal payments over the remaining period of the term loan. The Credit Agreement requires the Company to maintain certain financial covenants including a consolidated fixed charge coverage ratio (as defined in the Credit Agreement) of at least 1.25 to 1.00 starting with the end of the first quarter of fiscal 2015 and a consolidated leverage ratio (as defined in the Credit Agreement) no greater than 3.5 to 1.00 starting with the end of the first quarter of fiscal 2015. The Credit Agreement also includes other customary affirmative and negative covenants. The Company was in compliance with all covenants for the quarter ended September 25, 2015. The Credit Agreement also contains provisions requiring the following mandatory prepayments (subject to certain exceptions and limitations): annual prepayments in an amount equal to (a) 33% of excess cash flow (as defined in the Credit Agreement) if the aggregate outstanding principal amount of the New Term Loan equals or exceeds $20.0 million and (b) 25% of excess cash flow if the aggregate outstanding principal amount of the New Term Loan equals or exceeds $10.0 million but is less than $20.0 million. The Credit Agreement also restricts us from declaring or paying any cash dividends. The fair value of the Company’s long term debt was based on Level 2 inputs, and fair value was determined using quoted prices for similar liabilities in inactive markets. The fair value of the Company’s outstanding borrowings under the Company’s revolving credit facility was based on Level 2 inputs, and fair value was determined using inputs other than quoted prices that are observable, specifically, discounted cash flows of expected payments at current borrowing rates. The Company’s carrying value approximates fair value for the Company’s long term debt and revolving credit facility. As of September 25, 2015, the outstanding amounts under the Company’s New Term Loan and New Revolving Credit Facility were $37.5 million and $36.2 million, respectively, which are gross of unamortized debt issuance costs of $0.5 million for a total of $73.2 million. In addition to the New Term Loan and New Revolving loan, the Company has $3.7 million of bank debt from the acquired company, Miconex, with interest rates ranges from 1.3% to 10.5% and due dates from 2015 to 2020. As of September 25, 2015, our total bank debt was $76.9 million.

Income Tax

Income Tax	9 Months Ended
	Sep. 25, 2015
Income Tax Disclosure [Abstract]
Income Tax	7. Income Tax The Company’s income tax provision and effective tax rate for the three and nine month periods ended September 25, 2015 were $ 0.6 million and 27.8% and $2.0 million and 28.6%, respectively compared to $0.9 million and 19.6% and $3.9 million and 33.3%, respectively for the three and nine month periods ended September 26, 2014. The change in respective rates reflects, primarily, changes in the geographic mix of worldwide earnings and financial results, as well as the impact of losses which have a full valuation allowance for the three and nine month periods ended September 25, 2015 compared to the three and nine month periods ended September 26, 2014. Our effective tax rates were lower than the statutory rates for the first nine months of 2015 and 2014 primarily due to the geographic distribution of our world-wide earnings in foreign jurisdictions with lower tax rates or tax holidays, such as the tax holiday we are currently enjoying in Singapore. Company management continuously evaluates the need for a valuation allowance and as of September 25, 2015, concluded that a full valuation allowance on its California, Oregon, and one of its Chinese subsidiaries was still appropriate. The Company earns a significant amount of its operating income outside the United States, which is deemed to be indefinitely reinvested in foreign jurisdictions. As a result, most of the Company’s cash and cash equivalents are held by foreign subsidiaries. The Company currently does not intend nor foresee a need to repatriate these funds to the U.S. The Company expects existing domestic cash and cash flows from operations to continue to be sufficient to fund its domestic operating activities and cash commitments for investing and financing activities, such as debt repayment and capital expenditures, for at least the next 12 months and thereafter for the foreseeable future. If the Company should require more capital in the U.S. than is generated by its domestic operations, for example to fund significant discretionary activities such as business acquisitions, the Company could elect to repatriate future earnings from foreign jurisdictions or raise capital in the United States through debt or equity issuances. These alternatives could result in higher effective tax rates, increased interest expense, or dilution of our earnings. The Company has borrowed funds domestically and continues to believe it has the ability to do so at reasonable interest rates. The Company does not provide for U.S. taxes on its undistributed earnings of foreign subsidiaries that it intends to invest indefinitely outside the U.S., unless such taxes are otherwise required under U.S. tax law. In 2014, the Company determined that a portion of the current year earnings of one of its China subsidiaries may be remitted in the future to one of its foreign subsidiaries outside of mainland China and, accordingly, the Company provided for the related withholding taxes in its consolidated financial statements. If the Company changes its intent to reinvest its undistributed foreign earnings indefinitely or if a greater amount of undistributed earnings are needed than the previous anticipated remaining unremitted foreign earnings, the Company could be required to accrue or pay U.S. taxes on some or all of these undistributed earnings. As of September 25, 2015, the Company had undistributed earnings of foreign subsidiaries that are indefinitely invested outside of the U.S. of approximately $64.5 million. It is not practicable to determine the income tax liability that might be incurred if these earnings were to be distributed. The following table summarizes the activity related to the Company’s unrecognized tax benefits (in thousands): Nine months ended September 25, September 26, 2015 2014 Balance as of the beginning of period $ 356 $ 165 Increase (decrease) related to current year tax positions (26 ) 180 Balance as of the end of period $ 330 $ 345 The Company’s gross liability for unrecognized tax benefits as of September 25, 2015 and December 26, 2014 was $0.3 million and $0.3 million, respectively. Increases or decreases to interest and penalties on uncertain tax positions are included in the income tax provision in the condensed consolidated statements of operations. Interest related to uncertain tax positions was immaterial for each of the three and six month periods ended September 25, 2015 and September 26, 2014. Although it is possible some of the unrecognized tax benefits could be settled within the next twelve months, the Company cannot reasonably estimate the outcome at this time. The determination of the Company’s tax provision is subject to judgments and estimates. The carrying value of the Company’s net deferred tax assets, which is made up primarily of tax deductions and net operating loss carryforwards, assumes the Company will be able to generate sufficient future income to fully realize the income tax benefit. In determining whether the realization of these deferred tax assets may be impaired, the Company makes judgments with respect to whether the Company is likely to generate sufficient future taxable income to realize these assets. In addition, the calculation of tax liabilities involves significant judgment in estimating the impact of uncertainties in the application of complex tax laws. Resolution of these uncertainties in a manner inconsistent with the Company’s expectations could have a material impact on the Company’s results of operations and financial position. The Company files income tax returns in the U.S. federal jurisdiction, various states and foreign jurisdictions. The Company’s 2012 through 2014 federal income tax returns are open to audit through the statute of limitations by the Internal Revenue Service. The Company’s 2010 through 2014 state income tax returns are open to audit by the California Franchise Tax Board. The Company is also subject to examination in various other jurisdictions for various periods. The Company is currently enjoying a zero rate tax holiday related to its Singapore subsidiary that will expire for tax years beginning January 2016. This tax rate is subject to achieving certain commitments agreed to with the Economic Development Board of Singapore including investment and employment thresholds. The Company’s Singapore subsidiary recorded a net profit of $1.7 million and $6.2 million for the three and nine month periods ended September 25, 2015, respectively.

Net Income Per Share

Net Income Per Share	9 Months Ended
	Sep. 25, 2015
Earnings Per Share [Abstract]
Net Income Per Share	8. Net Income Per Share Basic net income per share excludes dilution and is computed by dividing net income by the weighted average number of common shares outstanding for the period. Diluted net income per share reflects the potential dilution that would occur if outstanding securities or other contracts to issue common stock were exercised or converted into common stock. The following is a reconciliation of the numerators and denominators used in computing basic and diluted net income per share (in thousands, except per share data): Three months ended Nine months ended September 25, September 26, September 25, September 26, 2015 2014 2015 2014 Numerator: Net income (loss) $ 1,676 $ (5,262 ) $ 5,056 $ 7,825 Denominator: Shares used in computation — basic: Weighted average common shares outstanding 31,993 29,477 31,359 29,242 Shares used in computation — diluted: Shares used in computing basic net income per share 31,993 29,477 31,359 29,242 Dilutive effect of common shares outstanding subject to repurchase 110 — 222 261 Dilutive effect of options outstanding 52 — 72 409 Weighted average shares used in computing diluted net income per share 32,155 29,477 31,653 29,912 Net income (loss) per share — basic $ 0.05 $ (0.18 ) $ 0.16 $ 0.27 Net income (loss) per share — diluted $ 0.05 $ (0.18 ) $ 0.16 $ 0.26 The Company had securities outstanding which could potentially dilute basic net income per share in the future, but the incremental shares from the assumed exercise of these securities were excluded in the computation of diluted net income per share, as their effect would have been anti-dilutive. Such outstanding securities consisted of 204,154 and 281,507 stock options for the three and nine month periods ended September 25, 2015, respectively. For the three months period ended September 26, 2014, all potentially dilutive securities outstanding were considered anti-dilutive, and therefore the calculation of basic and diluted net loss per share was the same and 268,706 stock options for the nine months period ended September 26, 2014 was excluded as their effect would have been anti-dilutive.

Commitments and Contingencies

Commitments and Contingencies	9 Months Ended
	Sep. 25, 2015
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	9. Commitments and Contingencies The Company had commitments to purchase inventory totaling approximately $36.5 million at September 25, 2015. The Company leases properties domestically in Hayward, California; Austin, Texas, Pflugerville, Texas; Chandler, Arizona; and South San Francisco, California and internationally in China, Singapore, Philippines and Czech Republic. The Company leases certain of its facilities under non-cancelable leases, which expire on various dates through 2022. As of September 25, 2015, future minimum payments under these operating leases were as follows (in thousands): Fiscal Year 2015 (remaining in year) $ 1,687 2016 6,136 2017 5,662 2018 4,479 2019 3,276 Thereafter 8,715 Total minimum lease payments $ 29,955 From time to time, the Company is subject to various legal proceedings and claims, either asserted or unasserted, that arise in the ordinary course of business. Although the outcome of the various legal proceedings and claims cannot be predicted with certainty, the Company has not had a history of outcomes to date that have been material to the statement of operations and does not believe that any of these proceedings or other claims will have a material adverse effect on its consolidated financial condition or results of operations.

Segment and Geographic Informat

Segment and Geographic Information	9 Months Ended
	Sep. 25, 2015
Segment Reporting [Abstract]
Segment and Geographic Information	10. Segment and Geographic Information The Company operates in one operating and reportable segment as the nature of the Company’s products and production processes, as well as type of customers and distribution methods, is consistent among all of the Company’s products and is engaged in the development, manufacture and supply of critical subsystems for the semiconductor capital equipment, consumer, medical, energy, industrial, flat panel and research industries. The Company’s foreign operations are conducted primarily through its wholly-owned subsidiaries in China, Singapore and Czech Republic. The Company’s principal markets include North America, Asia and Europe. Sales by geographic area represent sales to unaffiliated customers and are based upon the location to which the products were shipped. The following table sets forth revenue by geographic area (in thousands): Three months ended Nine months ended September 25, September 26, September 25, September 26, 2015 2014 2015 2014 United States $ 82,708 $ 82,310 $ 252,138 $ 282,336 China 1,017 16,035 18,267 52,461 Singapore 29,952 13,277 77,354 43,942 Austria 5,059 — 5,059 — Other 4,080 5,419 12,865 15,203 $ 122,816 $ 117,041 $ 365,683 $ 393,942 At September 25, 2015, approximately $9.8 million and $0.5 million of the Company’s net long-lived assets were located in Asia and Czech Republic, respectively, and the remaining balances were located in the United States. At September 26, 2014, approximately $3.9 million of the Company’s net long-lived assets were located in Asia, and the remaining balances were located in the United States.

Organization and Significant 17

Organization and Significant Accounting Policies (Policies)	9 Months Ended
	Sep. 25, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	Basis of Presentation
Principles of Consolidation	Principles of Consolidation
Foreign Currency Translation and Remeasurement	Foreign Currency Translation and Remeasurement
Use of Accounting Estimates	Use of Accounting Estimates
Certain Significant Risks and Uncertainties	Certain Significant Risks and Uncertainties
Concentration of Credit Risk	Concentration of Credit Risk
Significant sales to customers	Significant sales to customers Three months ended Nine months ended September 25, September 26, September 25, September 26, Lam Research Corporation 49.4 % 39.3 % 50.4 % 36.0 % Applied Materials, Inc. 26.4 20.9 27.1 22.0 ASM International * 13.9 * 17.0 Total 75.8 % 74.1 % 77.5 % 75.0 % * Total sales for the period are below 10%. Three customers’ accounts receivable balances, Applied Materials, Inc., Lam Research Corporation and ASM International, were individually greater than 10% of accounts receivable as of September 25, 2015 and December 26, 2014 and in the aggregate represented approximately 79.9% and 73.7% of accounts receivable, respectively.
Fair Value of Measurements	Fair Value of Measurements — Level 1 — Observable inputs that reflect quoted prices (unadjusted) for identical assets or liabilities in active markets. Level 2 — Inputs that are based upon quoted prices for similar instruments in active markets, quoted prices for identical or similar instruments in markets that are not active, and model-based valuation techniques for which all significant inputs are observable in the market or can be derived from observable market data. Where applicable, these models project future cash flows and discount the future amounts to a present value using market-based observable inputs including interest rate curves, foreign exchange rates, and credit ratings. Level 3 — Unobservable inputs that are supported by little or no market activities. The fair value hierarchy requires an entity to maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value.
Derivative Financial Instruments	Derivative Financial Instruments
Inventories	Inventories Inventory write downs inherently involve judgments as to assumptions about expected future demand and the impact of market conditions on those assumptions. Although the Company believes that the assumptions it used in estimating inventory write downs are reasonable, significant changes in any one of the assumptions in the future could produce a significantly different result. There can be no assurances that future events and changing market conditions will not result in significant increases in inventory write downs.
Equipment and Leasehold Improvements	Equipment and Leasehold Improvements
Product Warranty	Product Warranty — Nine months ended September 25, 2015 September 26, 2014 Beginning balance $ 109 $ 101 Change in reserve 300 97 Warranty costs incurred in the current period (225 ) (85 ) Ending balance $ 184 $ 113
Income Taxes	Income Taxes The Company continued to maintain a full valuation allowance on its California, Oregon, and one of its Chinese subsidiaries deferred tax amounts as of September 25, 2015 totaling $3.2 million. Income tax positions must meet a more likely than not recognition threshold to be recognized. Income tax positions that previously failed to meet the more likely than not threshold are recognized in the first subsequent financial reporting period in which that threshold is met. Previously recognized tax positions that no longer meet the more likely than not threshold are derecognized in the first subsequent financial reporting period in which that threshold is no longer met. The Company recognizes potential accrued interest and penalties related to unrecognized tax benefits within the consolidated statements of income as income tax expense. The calculation of tax liabilities involves significant judgment in estimating the impact of uncertainties in the application of complex tax laws. Resolution of these uncertainties in a manner inconsistent with the Company’s expectations could have a material impact on its results of operations and financial position. Management believes that it has adequately provided for any adjustments that may result from these examinations; however, the outcome of tax audits cannot be predicted with certainty. The determination of the Company’s tax provision is subject to judgments and estimates.
Revenue Recognition	Revenue Recognition
Research and Development Costs	Research and Development Costs
Net Income per Share	Net Income per Share
Segments	Segments
Business Combinations	Business Combinations
Stock-Based Compensation Expense	Stock-Based Compensation Expense The Company maintains stock-based compensation plans which allow for the issuance of equity-based awards to executives, directors and certain employees. These equity-based awards include stock options, restricted stock awards (“RSAs”) and restricted stock units (“RSUs”) which can be either time-based or performance-based. The Company also maintains an employee stock purchase plan that provides for the issuance of shares to all eligible employees of the Company at a discounted price. Stock-based compensation expense includes compensation costs related to estimated fair values of stock options and awards granted. The estimated fair value of the Company’s equity-based awards, net of expected forfeitures, is amortized on a straightline basis over the awards’ vesting period, typically four years for stock options, three years for RSUs and one year for RSAs, and is adjusted for subsequent changes in estimated forfeitures related to all equity-based awards and performance as it relates to performance-based RSUs. The Company applies the fair value recognition provisions based on the FASB’s guidance regarding stock-based compensation. The exercise price of each stock option equals the market price of the Company’s stock on the date of grant. Most options are scheduled to vest over four years and expire no later than ten years from the grant date. The fair value of each option grant is estimated on the date of grant using the Black-Scholes option pricing model. The determination of the fair value of share-based payment awards on the date of grant using an option-pricing model is affected by the Company’s stock price as well as assumptions regarding certain variables. These variables include the expected term of the awards; the Company’s expected stock price volatility over the term of the awards, actual and projected employee stock option exercise behaviors, the risk-free interest rate and expected dividends. The Company estimates the expected term of share-based awards granted based on the Company’s historical option term experience. The Company estimates the volatility of its common stock based upon the Company’s historical stock price volatility over the length of the expected term of the options. The Company bases the risk-free interest rate that it uses in the option valuation model on U.S. Treasury zero-coupon issues with remaining maturities similar to the expected term of the options. The Company does not anticipate paying any cash dividends in the foreseeable future and therefore uses an expected dividend yield of zero in the option valuation model. The Company is required to estimate forfeitures at the time of grant and revise those estimates in subsequent periods if actual forfeitures differ from those estimates. The Company uses historical data to estimate pre-vesting option forfeitures and records share-based compensation expense only for those awards that are expected to vest. The Company also considers, each quarter, whether there have been any significant changes in facts and circumstances that would affect its estimated forfeiture rate.
Stock Options	Stock Options Stock option activity for the nine months ended September 25, 2015: Shares Weighted Weighted Aggregate Outstanding at December 26, 2014 853,551 $ 8.87 1.35 $ 1,798 Granted — — Exercised (339,303 ) $ 6.48 Canceled (197,600 ) $ 11.18 Outstanding at September 25, 2015 316,648 $ 10.01 2.31 $ 234,133 Options exercisable at September 25, 2015 316,648 $ 10.01 2.31 $ 234,133 There were no options granted by the Company during either of the nine month periods ended September 25, 2015 and September 26, 2014. As of September 25, 2015, there was no stock-based compensation expense attributable to stock options as all outstanding options were fully vested.
Employee Stock Purchase Plan	Employee Stock Purchase Plan The Company also maintains an employee stock purchase plan (“ESPP”) that provides for the issuance of shares to all eligible employees of the Company at a discounted price. Under the ESPP, substantially all employees may purchase the Company’s common stock through payroll deductions at a price equal to 95 percent of the fair market value of the Company’s stock at the end of each applicable purchase period.
Restricted Stock Units and Restricted Stock Awards	Restricted Stock Units and Restricted Stock Awards The Company grants RSUs to employees and RSAs to non-employee directors as part of the Company’s long term equity compensation plan. Restricted Stock Units During the quarter ended March 27, 2015, the Company granted 456,500 RSU’s, with a weighted average fair value of $8.68 per share, and granted 90,500 performance stock units with a weighted average fair value of $8.35 per share. During the quarter ended June 26, 2015, the Company granted 134,000 RSU’s, with a weighted average fair value of $6.53 per share. The Company granted 103,500 RSU’s with a weighted average fair value of $6.71 per share during the quarter ended September 25, 2015. During the nine months ended September 25, 2015, 39,938 vested shares were withheld to satisfy withholding tax obligations, resulting in the net issuance of 337,443 shares. As of September 25, 2015, approximately $ 6.8 million of stock-based compensation cost, net of estimated forfeitures, related to RSU’s remains to be amortized over a weighted average period of 2.1 years. As of September 25, 2015, a total of 1,277,741 RSU’s remain outstanding with an aggregate fair value of $6.8 million and a weighted average remaining contractual term of 1.3 years. Restricted Stock Awards The following table summarizes the Company’s RSU and RSA activity for the nine months September 25, 2015: Shares Aggregate Unvested restricted stock units and restricted stock awards at December 26, 2014 1,078,279 $ 9,673 Granted 840,500 Vested (424,381 ) Forfeited (216,657 ) Unvested restricted stock units and restricted stock awards at September 25, 2015 1,277,741 $ 6,800 Vested and expected to vest restricted stock units and restricted stock awards at September 25, 2015 1,076,186 $ 5,686 The following table shows the Company’s stock-based compensation expense included in the condensed consolidated statements of operations (in thousands): Three months ended Nine months ended September 25, 2015 September 26, 2014 September 25, 2015 September 26, 2014 Cost of sales (1) $ 304 $ 267 $ 908 $ 862 Research and development 658 100 1,247 245 Sales and marketing 49 119 150 334 General and administrative 103 671 302 1728 1,114 1,157 2,607 3,169 Income tax benefit (310 ) (226 ) (746 ) (1,056 ) Net stock-based compensation expense $ 804 $ 931 $ 1,861 $ 2,113 (1) Stock-based compensation expenses capitalized in inventory for the three and nine month periods ended September 25, 2015 and September 26, 2014 were considered immaterial.
Recent Accounting Pronouncements	Recent Accounting Pronouncements In September 2015, the Financial Accounting Standards Board (FASB) issued updated guidance on the accounting for purchase accounting adjustments determined during the measurement period (i.e. up to one year after the acquisition). The new guidance requires an acquirer to recognize such adjustments in the reporting period in which the adjustment amounts are determined. Previously, such adjustments were required to be recorded on a retrospective basis. The Company has elected to early adopt this guidance beginning in the third quarter 2015 on a prospective basis. The adoption of this guidance did not have a significant impact on the condensed consolidated financial statements. In July 2015, the FASB issued authoritative guidance that requires inventory to be measured at the lower of cost and net realizable value instead of at lower of cost or market. This guidance does not apply to inventory that is measured using last-in, first out (LIFO) or the retail inventory method but applies to all other inventory including those measured using first-in, first-out (FIFO) or the average cost method. The authoritative guidance will be effective for the Company in the first quarter of fiscal 2018 and should be applied prospectively. Early adoption is permitted as of the beginning of an interim or annual reporting period. The Company is currently evaluating the effect of this new guidance on the Company’s consolidated financial statements. In April 2015, the FASB issued authoritative guidance that requires debt issuance costs to be presented in the balance sheet as a direct deduction from the carrying amount of the related debt liability, consistent with debt discounts. The authoritative guidance is effective for the Company in the first quarter of fiscal 2017 and should be applied retrospectively. Early adoption is permitted. The adoption of this guidance is not expected to have a significant impact on the Company’s consolidated financial statements.

Organization and Significant 18

Organization and Significant Accounting Policies (Tables)	9 Months Ended
	Sep. 25, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Customers as Percentage of Total Sales	The Company’s most significant customers (having accounted for 10% or more of sales) and their related sales as a percentage of total sales were as follows: Three months ended Nine months ended September 25, September 26, September 25, September 26, Lam Research Corporation 49.4 % 39.3 % 50.4 % 36.0 % Applied Materials, Inc. 26.4 20.9 27.1 22.0 ASM International * 13.9 * 17.0 Total 75.8 % 74.1 % 77.5 % 75.0 % * Total sales for the period are below 10%.
Components of Reserve for Warranty Costs	Components of the reserve for warranty costs consisted of the following (in thousands): Nine months ended September 25, 2015 September 26, 2014 Beginning balance $ 109 $ 101 Change in reserve 300 97 Warranty costs incurred in the current period (225 ) (85 ) Ending balance $ 184 $ 113
Schedule of Stock Option Activity	Stock option activity for the nine months ended September 25, 2015: Shares Weighted Weighted Aggregate Outstanding at December 26, 2014 853,551 $ 8.87 1.35 $ 1,798 Granted — — Exercised (339,303 ) $ 6.48 Canceled (197,600 ) $ 11.18 Outstanding at September 25, 2015 316,648 $ 10.01 2.31 $ 234,133 Options exercisable at September 25, 2015 316,648 $ 10.01 2.31 $ 234,133
Summary of Restricted Stock Unit and Restricted Stock Award Activity	The following table summarizes the Company’s RSU and RSA activity for the nine months September 25, 2015: Shares Aggregate Unvested restricted stock units and restricted stock awards at December 26, 2014 1,078,279 $ 9,673 Granted 840,500 Vested (424,381 ) Forfeited (216,657 ) Unvested restricted stock units and restricted stock awards at September 25, 2015 1,277,741 $ 6,800 Vested and expected to vest restricted stock units and restricted stock awards at September 25, 2015 1,076,186 $ 5,686
Stock-Based Compensation Expense Included in Condensed Consolidated Statements of Operations	The following table shows the Company’s stock-based compensation expense included in the condensed consolidated statements of operations (in thousands): Three months ended Nine months ended September 25, 2015 September 26, 2014 September 25, 2015 September 26, 2014 Cost of sales (1) $ 304 $ 267 $ 908 $ 862 Research and development 658 100 1,247 245 Sales and marketing 49 119 150 334 General and administrative 103 671 302 1728 1,114 1,157 2,607 3,169 Income tax benefit (310 ) (226 ) (746 ) (1,056 ) Net stock-based compensation expense $ 804 $ 931 $ 1,861 $ 2,113 (1) Stock-based compensation expenses capitalized in inventory for the three and nine month periods ended September 25, 2015 and September 26, 2014 were considered immaterial.

Financial Instruments (Tables)

Financial Instruments (Tables)	9 Months Ended
	Sep. 25, 2015
Investments, All Other Investments [Abstract]
Schedule of Derivative Instruments at Gross Fair Value	The Company records all derivatives in the Condensed Consolidated Balance Sheets at fair value. The Company’s accounting treatment for these derivative instruments is based on its hedge designation. The following tables show the Company’s derivative instruments at gross fair value (in thousands) as of September 25, 2015. There were no derivative instruments as of December 26, 2014. September 25, 2015 Fair Value of Derivatives Designated as Hedge Instruments Fair Value of Derivatives Not Designated as Hedge Instruments Balance Sheet Location Total Fair Value Derivative liabilities Level 2 Foreign exchange contracts Deferred rent and other liabilities $ — $ 12 $ 12 Interest rate swap Deferred rent and other liabilities $ 91 $ 10 $ 101
Effect of Derivative Instruments in Cash Flow Hedging Relationships on Income and Other Comprehensive Income	The effect of derivative instruments in cash flow hedging relationships on income and other comprehensive income (OCI) is summarized below (in thousands): Gains (Losses) Recognized in OCI on Derivatives Before Tax Three Months Ended Nine Months Ended September 25, September 26, September 25, September 26, Derivatives in Cash Flow Hedging Relationship Interest rate swap $ 87 $ — $ 87 $ — Gains Reclassified from AOCI into Income (Effective Portion) Three Months Ended Nine Months Ended Income Statement Location September 25, September 26, September 25, September 26, Derivatives in Cash Flow Hedging Relationship Interest rate swap Interest and other income (expense), net $ 4 $ — $ 4 $ —

Balance Sheet Information (Tabl

Balance Sheet Information (Tables)	9 Months Ended
	Sep. 25, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Summary of Inventory	Inventory consisted of the following (in thousands): September 25, 2015 December 26, 2014 Raw materials $ 60,484 $ 45,294 Work in process 18,741 14,103 Finished goods 4,111 3,922 83,336 63,319 Reserve for excess and obsolete (7,772 ) (6,469 ) Total $ 75,564 $ 56,850
Equipment and Leasehold Improvements, Net	Equipment and leasehold improvements, net, consisted of the following (in thousands): September 25, 2015 December 26, 2014 Computer equipment and software $ 10,989 $ 9,299 Furniture and fixtures 6,076 2,582 Machinery and equipment 15,467 10,774 Leasehold improvements 12,853 12,847 45,385 35,502 Accumulated depreciation (28,417 ) (24,661 ) Total $ 16,968 $ 10,841

Acquisitions (Tables)

Acquisitions (Tables)	9 Months Ended
	Sep. 25, 2015
Schedule of Allocation of Preliminary Purchase Price for Acquisition	The preliminary purchase price for this acquisition has been allocated as follows: Fair Market Values (in thousands) Inventories $ 1,297 Equipment and leasehold improvements 767 Goodwill 18,380 Purchased intangible assets 23,370 Other non-current assets 26 Total assets acquired 43,840 Other liabilities (100 ) Total liabilities assumed (100 ) Purchase price allocated $ 43,740
Summary of Purchased Intangible Assets	Useful Life Purchased Intangible (In years) (In thousands) Customer relationships 10 $ 9,900 Trade name 6 1,170 Intellectual properties/know-how 8-12 12,300 Total purchased intangible assets $ 23,370
Unaudited Proforma Consolidated Results of Operations	The following unaudited pro forma consolidated results of operations assume the Marchi and Miconex acquisitions were completed as of the beginning of the year of the reporting periods presented (in thousands, except per share amounts): Three Months Ended Nine Months Ended September 25, 2015 September 26, 2014 September 25, 2015 September 26, 2014 Net sales $ 127,348 $ 126,857 $ 386,889 $ 428,703 Net income $ 1,560 $ (4,301 ) $ 6,049 $ 11,414 Basic earnings per share $ 0.05 $ (0.14 ) $ 0.19 $ 0.37 Diluted earnings per share $ 0.05 $ (0.14 ) $ 0.19 $ 0.36
Miconex [Member]
Schedule of Allocation of Preliminary Purchase Price for Acquisition	The preliminary purchase price for this acquisition has been allocated as follows: Fair Market Values (in thousands) Cash and cash equivalents $ 239 Accounts receivable 3,065 Inventories 6,198 Deferred tax assets 196 Prepaid expenses and other 214 Equipment and leasehold improvements 428 Goodwill 10,197 Purchased intangible assets 8,800 Total assets acquired 29,337 Bank borrowings (3,027 ) Accounts payable (3,509 ) Accrued compensation and related benefits (432 ) Other current liabilities (576 ) Deferred tax liability (1,672 ) Other liabilities (24 ) Total liabilities assumed (9,240 ) Purchase price allocated $ 20,097
Summary of Purchased Intangible Assets	Useful Life Purchased Intangible (In years) (In thousands) Customer relationships 7.5 $ 8,800

Goodwill and Purchased Intang22

Goodwill and Purchased Intangible Assets (Tables)	9 Months Ended
	Sep. 25, 2015
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Other Indefinite Lived Intangible Assets	Details of goodwill and other intangible assets were as follows (in thousands): September 25, 2015 December 26, 2014 Goodwill Intangible Assets Total Goodwill Intangible Assets Total Carrying amount $ 84,495 $ 44,952 $ 129,447 $ 55,918 $ 16,824 $ 72,742
Details of Purchased Intangible Assets	Details of purchased intangible assets were as follows (in thousands): As of September 25, 2015 As of December 26, 2014 Gross Gross Carrying Accumulated Carrying Carrying Accumulated Carrying Useful Life Amount Amortization Value Amount Amortization Value (in years) AIT Customer relationships $ 19,000 $ (14,726 ) $ 4,274 $ 19,000 $ (13,011 ) $ 5,989 7 Tradename 1,900 (1,304 ) 596 1,900 (1,081 ) 819 6 Intellectual property/know-how 1,600 (743 ) 857 1,600 (571 ) 1,029 7 Marchi Customer relationships 9,900 (660 ) 9,240 — — — 10 Tradename 1,170 (158 ) 1,012 — — — 6 Intellectual property/know-how 12,300 (919 ) 11,381 — — — 8-12 Miconex Customer relationships 8,800 (195 ) 8,605 — — — 7.5 UCT Tradename 8,987 — 8,987 8,987 — 8,987 * Total $ 63,657 $ (18,705 ) $ 44,952 $ 31,487 $ (14,663 ) $ 16,824 * The Company concluded that the UCT tradename intangible asset life is indefinite and is therefore not amortized but is reviewed for impairment at least annually and whenever events or changes in circumstances indicate that the carrying value of an asset may not be recoverable.
Future Estimated Amortization Expense	As of September 25, 2015, future estimated amortization expense is expected to be as follows (in thousands): Amortization Expense 2015 (remaining in year) $ 1,648 2016 6,062 2017 5,142 2018 4,582 2019 4,210 Thereafter 14,321 Total $ 35,965

Income Tax (Tables)

Income Tax (Tables)	9 Months Ended
	Sep. 25, 2015
Income Tax Disclosure [Abstract]
Activity Related to Company's Unrecognized Tax Benefits	The following table summarizes the activity related to the Company’s unrecognized tax benefits (in thousands): Nine months ended September 25, September 26, 2015 2014 Balance as of the beginning of period $ 356 $ 165 Increase (decrease) related to current year tax positions (26 ) 180 Balance as of the end of period $ 330 $ 345

Net Income Per Share (Tables)

Net Income Per Share (Tables)	9 Months Ended
	Sep. 25, 2015
Earnings Per Share [Abstract]
Basic and Diluted Net Income Per Share	The following is a reconciliation of the numerators and denominators used in computing basic and diluted net income per share (in thousands, except per share data): Three months ended Nine months ended September 25, September 26, September 25, September 26, 2015 2014 2015 2014 Numerator: Net income (loss) $ 1,676 $ (5,262 ) $ 5,056 $ 7,825 Denominator: Shares used in computation — basic: Weighted average common shares outstanding 31,993 29,477 31,359 29,242 Shares used in computation — diluted: Shares used in computing basic net income per share 31,993 29,477 31,359 29,242 Dilutive effect of common shares outstanding subject to repurchase 110 — 222 261 Dilutive effect of options outstanding 52 — 72 409 Weighted average shares used in computing diluted net income per share 32,155 29,477 31,653 29,912 Net income (loss) per share — basic $ 0.05 $ (0.18 ) $ 0.16 $ 0.27 Net income (loss) per share — diluted $ 0.05 $ (0.18 ) $ 0.16 $ 0.26

Commitments and Contingencies (

Commitments and Contingencies (Tables)	9 Months Ended
	Sep. 25, 2015
Commitments and Contingencies Disclosure [Abstract]
Summary of Future Minimum Payments under Operating Leases	As of September 25, 2015, future minimum payments under these operating leases were as follows (in thousands): Fiscal Year 2015 (remaining in year) $ 1,687 2016 6,136 2017 5,662 2018 4,479 2019 3,276 Thereafter 8,715 Total minimum lease payments $ 29,955

Segment and Geographic Inform26

Segment and Geographic Information (Tables)	9 Months Ended
	Sep. 25, 2015
Segment Reporting [Abstract]
Revenue by Geographic Area	The following table sets forth revenue by geographic area (in thousands): Three months ended Nine months ended September 25, September 26, September 25, September 26, 2015 2014 2015 2014 United States $ 82,708 $ 82,310 $ 252,138 $ 282,336 China 1,017 16,035 18,267 52,461 Singapore 29,952 13,277 77,354 43,942 Austria 5,059 — 5,059 — Other 4,080 5,419 12,865 15,203 $ 122,816 $ 117,041 $ 365,683 $ 393,942

Organization and Significant 27

Organization and Significant Accounting Policies - Additional Information (Detail) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 25, 2015USD ($)	Sep. 26, 2014	Sep. 25, 2015USD ($)SegmentCustomer	Sep. 26, 2014	Dec. 26, 2014Customer
Concentration Risk [Line Items]
Number of reportable segments | Segment			1
California and Oregon [Member]
Concentration Risk [Line Items]
Valuation allowance on deferred tax assets	$ 3.2		$ 3.2
Subsidiaries [Member] | China [Member]
Concentration Risk [Line Items]
Valuation allowance on deferred tax assets	$ 3.2		$ 3.2
Customer concentration risk [Member]
Concentration Risk [Line Items]
Number of customers with accounts receivable greater than 10% | Customer			3		3
Sales [Member] | International Sales [Member]
Concentration Risk [Line Items]
Concentration percentage	35.60%	30.70%	33.30%	29.50%
Sales [Member] | Customer concentration risk [Member]
Concentration Risk [Line Items]
Concentration percentage	75.80%	74.10%	77.50%	75.00%
Applied Materials, Inc., Lam Research Corporation and ASM International [Member] | Accounts receivable [Member] | Customer concentration risk [Member]
Concentration Risk [Line Items]
Concentration percentage			79.90%		73.70%
Minimum [Member]
Concentration Risk [Line Items]
Fiscal year duration			364 days
Useful lives range			3 years
Maximum [Member]
Concentration Risk [Line Items]
Fiscal year duration			371 days
Useful lives range			15 years
Product warranty period (in years)			2 years
Measurement period to determine fair value of assets and liabilities			12 months

Organization and Significant 28

Organization and Significant Accounting Policies - Customers as Percentage of Total Sales (Detail) - Sales [Member] - Customer concentration risk [Member]	3 Months Ended		9 Months Ended
	Sep. 25, 2015	Sep. 26, 2014	Sep. 25, 2015	Sep. 26, 2014
Concentration Risk [Line Items]
Total	75.80%	74.10%	77.50%	75.00%
Lam Research Corporation [Member]
Concentration Risk [Line Items]
Total	49.40%	39.30%	50.40%	36.00%
Applied Materials, Inc. [Member]
Concentration Risk [Line Items]
Total	26.40%	20.90%	27.10%	22.00%
ASM International [Member]
Concentration Risk [Line Items]
Total		13.90%		17.00%

Organization and Significant 29

Organization and Significant Accounting Policies - Customers as Percentage of Total Sales (Parenthetical) (Detail) - Sales [Member] - Customer concentration risk [Member]	3 Months Ended		9 Months Ended
	Sep. 25, 2015	Sep. 26, 2014	Sep. 25, 2015	Sep. 26, 2014
Concentration Risk [Line Items]
Total	75.80%	74.10%	77.50%	75.00%
ASM International [Member]
Concentration Risk [Line Items]
Total		13.90%		17.00%
ASM International [Member] | Maximum [Member]
Concentration Risk [Line Items]
Total	10.00%		10.00%

Organization and Significant 30

Organization and Significant Accounting Policies - Components of Reserve for Warranty Costs (Detail) - USD ($) $ in Thousands	9 Months Ended
	Sep. 25, 2015	Sep. 26, 2014
Standard Product Warranty Disclosure [Abstract]
Beginning balance	$ 109	$ 101
Change in reserve	300	97
Warranty costs incurred in the current period	(225)	(85)
Ending balance	$ 184	$ 113

Organization and Significant 31

Organization and Significant Accounting Policies - Additional Information 1 (Detail) - USD ($)	3 Months Ended			9 Months Ended
	Sep. 25, 2015	Jun. 26, 2015	Mar. 27, 2015	Sep. 25, 2015	Sep. 26, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Dividend yield				0.00%
Number of options granted				0
Employee stock options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares vesting period, years				4 years
Number of options granted				0	0
Stock-based compensation expense				$ 0
Employee stock options [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares vesting period, years				4 years
Employee stock options [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares vesting period, years				10 years
Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares vesting period, years				3 years
Granted stock units	103,500	134,000	456,500
Weighted average fair value, granted	$ 6.71	$ 6.53	$ 8.68
Vested shares withheld to satisfy withholding tax obligations				39,938
Vested shares issued net of tax withholdings				337,443
Stock-based compensation cost, net of estimated forfeitures, recognized				$ 6,800,000
Outstanding restricted stock	1,277,741			1,277,741
Aggregate fair value	$ 6,800,000			$ 6,800,000
Weighted average remaining contractual term (in years)				1 year 3 months 18 days
Restricted Stock Units [Member] | Employees [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares vesting period, years				3 years
Unit purchase price of Restricted Stock Units				$ 0
Restricted Stock Units [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares vesting period, years				2 years 1 month 6 days
Restricted Stock Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares vesting period, years				1 year
Restricted Stock Awards [Member] | Non-Employee Directors [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding restricted stock	48,000			48,000
Unamortized expense of company's unvested restricted stock awards	$ 200,000			$ 200,000
Employee Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee common stock fair market value rate				95.00%
Performance Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted stock units			90,500
Weighted average fair value, granted			$ 8.35

Organization and Significant 32

Organization and Significant Accounting Policies - Schedule of Stock Option Activity (Detail) - USD ($) $ / shares in Units, $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 25, 2015	Dec. 26, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Outstanding, Shares, Beginning balance	853,551
Granted, Shares	0
Exercised, Shares	(339,303)
Cancelled, Shares	(197,600)
Outstanding, Shares, Ending balance	316,648	853,551
Options exercisable, Shares	316,648
Weighted Average Exercise Price, Outstanding, Beginning balance	$ 8.87
Granted, Weighted Average Exercise Price	0
Exercised, Weighted Average Exercise Price	6.48
Cancelled, Weighted Average Exercise Price	11.18
Weighted Average Exercise Price, Outstanding, Ending balance	10.01	$ 8.87
Options exercisable, Weighted Average Exercise Price	$ 10.01
Weighted Average Remaining Contractual Life (years), Outstanding	2 years 3 months 22 days	1 year 4 months 6 days
Weighted Average Remaining Contractual Life (years), Options exercisable	2 years 3 months 22 days
Aggregate Intrinsic Value, Outstanding, Beginning balance	$ 1,798
Aggregate Intrinsic Value, Outstanding, Ending balance	234,133	$ 1,798
Aggregate Intrinsic Value, Options exercisable	$ 234,133

Organization and Significant 33

Organization and Significant Accounting Policies - Summary of Restricted Stock Unit and Restricted Stock Award Activity (Detail) - Restricted Stock Unit and Restricted Stock Award [Member] - USD ($) $ in Thousands	9 Months Ended
	Sep. 25, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unvested restricted stock units and restricted stock awards, Number of Shares, Beginning balance	1,078,279
Granted, Number of Shares	840,500
Vested, Number of Shares	(424,381)
Forfeited, Number of Shares	(216,657)
Unvested restricted stock units and restricted stock awards, Number of Shares, Ending balance	1,277,741
Vested and expected to vest restricted stock units and restricted stock awards, Number of Shares	1,076,186
Unvested restricted stock units and restricted stock awards, Beginning balance, Aggregate Fair Value	$ 9,673
Unvested restricted stock units and restricted stock awards, Ending balance, Aggregate Fair Value	6,800
Vested and expected to vest restricted stock units and restricted stock awards, Aggregate Fair Value	$ 5,686

Organization and Significant 34

Organization and Significant Accounting Policies - Stock-Based Compensation Expense Included in Condensed Consolidated Statements of Operations (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 25, 2015	Sep. 26, 2014	Sep. 25, 2015	Sep. 26, 2014
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation	$ 1,114	$ 1,157	$ 2,607	$ 3,169
Income tax benefit	(310)	(226)	(746)	(1,056)
Net stock-based compensation expense	804	931	1,861	2,113
Cost of goods sold [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation	304	267	908	862
Research and development [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation	658	100	1,247	245
Sales and marketing [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation	49	119	150	334
General and administrative [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation	$ 103	$ 671	$ 302	$ 1,728

Financial Instruments - Additio

Financial Instruments - Additional Information (Detail) - USD ($)	Sep. 25, 2015	Sep. 25, 2015	Sep. 26, 2014	Sep. 25, 2015	Sep. 26, 2014	Dec. 26, 2014	Dec. 27, 2013
Financial Instruments [Line Items]
Carrying value of cash and cash equivalents	$ 59,783,000	$ 59,783,000	$ 75,147,000	$ 59,783,000	$ 75,147,000	$ 78,997,000	$ 60,415,000
Effective portion of cash flow hedge before tax effect	100,000
Cash flow hedge, expected to be reclassified from AOCI into earnings	100,000
Money market fund deposits [Member]
Financial Instruments [Line Items]
Carrying value of cash and cash equivalents	300,000	300,000		300,000
Money market fund deposits [Member] | Level 1 [Member]
Financial Instruments [Line Items]
Fair value of cash and cash equivalents	300,000	300,000		300,000
New Term Loan Credit Facility [Member]
Financial Instruments [Line Items]
Outstanding amounts	37,500,000	37,500,000		$ 37,500,000
Miconex [Member] | Derivatives Not Designated As Hedging Instruments [Member]
Financial Instruments [Line Items]
Non-Designated Derivatives, description				Miconex derivatives are not designated as hedging instruments and consist of a) forward contracts that Miconex uses to hedge forecasted transactions that are denominated in currencies other than the local currency of Miconex, and b) an interest rate swap with a total notional amount of $18,000 to convert the variable interest rates on Miconex debt to fixed interest rates.
Interest Rate Swap [Member] | New Term Loan Credit Facility [Member]
Financial Instruments [Line Items]
Derivative instrument, notional amount	20,000,000	20,000,000		$ 20,000,000
Interest Rate Swap [Member] | Miconex [Member] | Derivatives Not Designated As Hedging Instruments [Member]
Financial Instruments [Line Items]
Derivative instrument, notional amount	500,000	500,000		500,000
Foreign Exchange Contracts [Member] | Miconex [Member] | Derivatives Not Designated As Hedging Instruments [Member]
Financial Instruments [Line Items]
Derivative instrument, notional amount	1,300,000	1,300,000		1,300,000		$ 0
Credit Agreement [Member] | New Term Loan Credit Facility [Member]
Financial Instruments [Line Items]
Outstanding amounts	$ 37,500,000	$ 37,500,000		$ 37,500,000
Debt instrument interest rate	2.50%	2.50%		2.50%
Credit Agreement [Member] | London Interbank Offered Rate (LIBOR) [Member] | New Term Loan Credit Facility [Member]
Financial Instruments [Line Items]
Debt instrument variable interest rate				0.20%
Credit Agreement [Member] | Interest Rate Swap [Member] | New Term Loan Credit Facility [Member]
Financial Instruments [Line Items]
Debt instrument interest rate	3.49%	3.49%		3.49%
Debt instrument LIBOR rate	0.99%	0.99%		0.99%
East West and City National Bank [Member] | Interest Rate Swap [Member]
Financial Instruments [Line Items]
Derivative instrument, notional amount	$ 20,000,000	$ 20,000,000		$ 20,000,000
Derivatives in Cash Flow Hedging Relationship [Member]
Financial Instruments [Line Items]
Gains (losses) recognized in income on derivatives that are excluded from effectiveness testing and ineffective portion		0	$ 0	0	$ 0
Derivatives in Cash Flow Hedging Relationship [Member] | East West and City National Bank [Member] | New Term Loan Credit Facility [Member]
Financial Instruments [Line Items]
Outstanding amounts	$ 37,500,000	$ 37,500,000		$ 37,500,000
Debt instrument interest rate	3.49%	3.49%		3.49%

Financial Instruments - Schedul

Financial Instruments - Schedule of Derivative Instruments at Gross Fair Value (Detail) - Level 2 [Member] - Deferred Rent and Other Liabilities [Member] $ in Thousands	Sep. 25, 2015USD ($)
Foreign Exchange Contracts [Member]
Derivatives, Fair Value [Line Items]
Derivative liabilities, Fair Value of Derivatives Not Designated as Hedge Instruments	$ 12
Derivative liabilities, Total Fair Value	12
Interest Rate Swap [Member]
Derivatives, Fair Value [Line Items]
Derivative liabilities, Fair Value of Derivatives Designated as Hedge Instruments	91
Derivative liabilities, Fair Value of Derivatives Not Designated as Hedge Instruments	10
Derivative liabilities, Total Fair Value	$ 101

Financial Instruments - Effect

Financial Instruments - Effect of Derivative Instruments in Cash Flow Hedging Relationships on Income and Other Comprehensive Income (Detail) - Interest Rate Swap [Member] - Derivatives in Cash Flow Hedging Relationship [Member] - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 25, 2015	Sep. 25, 2015
Derivative Instruments, Gain (Loss) [Line Items]
Gains (Losses) Recognized in OCI on Derivatives Before Tax Effect (Effective Portion)	$ 87	$ 87
Interest and other income (expense), net [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gains Reclassified from AOCI into Income (Effective Portion)	$ 4	$ 4

Balance Sheet Information - Sum

Balance Sheet Information - Summary of Inventory (Detail) - USD ($) $ in Thousands	Sep. 25, 2015	Dec. 26, 2014
Inventory Disclosure [Abstract]
Raw materials	$ 60,484	$ 45,294
Work in process	18,741	14,103
Finished goods	4,111	3,922
Inventory, gross	83,336	63,319
Reserve for excess and obsolete	(7,772)	(6,469)
Total	$ 75,564	$ 56,850

Balance Sheet Information - Equ

Balance Sheet Information - Equipment and Leasehold Improvements, Net (Detail) - USD ($) $ in Thousands	Sep. 25, 2015	Dec. 26, 2014
Property, Plant and Equipment [Line Items]
Equipment and leasehold improvements, gross	$ 45,385	$ 35,502
Accumulated depreciation	(28,417)	(24,661)
Total	16,968	10,841
Computer equipment and software [Member]
Property, Plant and Equipment [Line Items]
Equipment and leasehold improvements, gross	10,989	9,299
Furniture and fixtures [Member]
Property, Plant and Equipment [Line Items]
Equipment and leasehold improvements, gross	6,076	2,582
Machinery and equipment [Member]
Property, Plant and Equipment [Line Items]
Equipment and leasehold improvements, gross	15,467	10,774
Leasehold improvements [Member]
Property, Plant and Equipment [Line Items]
Equipment and leasehold improvements, gross	$ 12,853	$ 12,847

Acquisitions - Additional Infor

Acquisitions - Additional Information (Detail) - USD ($)	Jul. 31, 2015	Feb. 05, 2015	Sep. 25, 2015	Sep. 26, 2014	Sep. 25, 2015	Sep. 26, 2014	Feb. 28, 2015
Business Acquisition [Line Items]
Business acquisition, potential cash earn-out payments			$ 1,280,000		$ 1,280,000
Fair value of common stock per share	$ 7.64
Goodwill amortization period					15 years
Net sales			122,816,000	$ 117,041,000	$ 365,683,000	$ 393,942,000
Operating income			3,079,000	(3,963,000)	9,155,000	13,258,000
Amortization of finite lived intangibles			1,600,000	$ 1,200,000	4,042,000	$ 3,663,000
Miconex [Member]
Business Acquisition [Line Items]
Cash paid for acquisition	$ 15,000,000
Business acquisition, potential cash earn-out payments	$ 1,300,000
Business acquisition, potential cash payments period	2 years
Percentage of shareholding interest acquired	100.00%
Purchase price allocated	$ 20,097,000
Stock consideration for acquisition	3,800,000
Net sales			5,200,000		5,200,000
Operating income			400,000		400,000
Amortization of finite lived intangibles			200,000		200,000
Miconex [Member] | Maximum [Member]
Business Acquisition [Line Items]
Business acquisition, potential cash earn-out payments	$ 4,000,000
Miconex [Member] | Common Stock [Member]
Business Acquisition [Line Items]
Shares of newly issued common stock	500,000
Miconex [Member] | General and administrative [Member]
Business Acquisition [Line Items]
Acquisition costs					400,000
Marchi Thermal Systems Inc [Member]
Business Acquisition [Line Items]
Cash paid for acquisition		$ 29,900,000
Shares of newly issued common stock		1,437,500
Percentage of shareholding interest acquired		100.00%
Purchase price allocated							$ 43,740,000
Net sales			3,900,000		10,100,000
Operating income			1,700,000		4,400,000
Amortization of finite lived intangibles			700,000		1,700,000
Acquisition costs		$ 200,000
Total purchase price		43,700,000
Amount borrowed to finance cash portion of acquisition		$ 29,700,000
Marchi Thermal Systems Inc [Member] | General and administrative [Member]
Business Acquisition [Line Items]
Acquisition costs					200,000
Marchi Thermal Systems Inc And Miconex Sro [Member]
Business Acquisition [Line Items]
Acquisition related costs			$ 600,000		$ 600,000

Acquisitions - Schedule of Allo

Acquisitions - Schedule of Allocation of Preliminary Purchase Price for Acquisition (Detail) - USD ($) $ in Thousands	Sep. 25, 2015	Jul. 31, 2015	Feb. 28, 2015	Dec. 26, 2014
Business Acquisition [Line Items]
Goodwill	$ 84,495			$ 55,918
Miconex [Member]
Business Acquisition [Line Items]
Cash and cash equivalents		$ 239
Accounts receivable		3,065
Inventories		6,198
Deferred tax assets		196
Prepaid expenses and other		214
Equipment and leasehold improvements		428
Goodwill		10,197
Purchased intangible assets		8,800
Total assets acquired		29,337
Accounts payable		(3,509)
Bank borrowings		(3,027)
Accrued compensation and related benefits		(432)
Other current liabilities		(576)
Deferred tax liability		(1,672)
Other liabilities		(24)
Total liabilities assumed		(9,240)
Purchase price allocated		$ 20,097
Marchi Thermal Systems Inc [Member]
Business Acquisition [Line Items]
Inventories			$ 1,297
Equipment and leasehold improvements			767
Goodwill			18,380
Purchased intangible assets			23,370
Other non-current assets			26
Total assets acquired			43,840
Other liabilities			(100)
Total liabilities assumed			(100)
Purchase price allocated			$ 43,740

Acquisitions - Summary of Purch

Acquisitions - Summary of Purchased Intangible Assets (Detail) - USD ($) $ in Thousands	1 Months Ended		12 Months Ended
	Jul. 31, 2015	Feb. 28, 2015	Dec. 26, 2014	Sep. 25, 2015
Miconex [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Total purchased intangible assets	$ 8,800
Marchi Thermal Systems Inc [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Total purchased intangible assets		$ 23,370
Customer relationships [Member] | Miconex [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Purchased intangible assets, Useful Life	7 years 6 months		7 years 6 months
Total purchased intangible assets	$ 8,800			$ 8,800
Customer relationships [Member] | Marchi Thermal Systems Inc [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Purchased intangible assets, Useful Life		10 years	10 years
Total purchased intangible assets		$ 9,900		9,900
Trade name [Member] | Marchi Thermal Systems Inc [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Purchased intangible assets, Useful Life		6 years	6 years
Total purchased intangible assets		$ 1,170		1,170
Intellectual Properties/Know-How [Member] | Marchi Thermal Systems Inc [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Total purchased intangible assets		$ 12,300		$ 12,300
Intellectual Properties/Know-How [Member] | Marchi Thermal Systems Inc [Member] | Minimum [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Purchased intangible assets, Useful Life		8 years	8 years
Intellectual Properties/Know-How [Member] | Marchi Thermal Systems Inc [Member] | Maximum [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Purchased intangible assets, Useful Life		12 years	12 years

Acquisitions - Unaudited Profor

Acquisitions - Unaudited Proforma Consolidated Results of Operations (Detail) - Marchi Thermal Systems Inc And Miconex Sro [Member] - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 25, 2015	Sep. 26, 2014	Sep. 25, 2015	Sep. 26, 2014
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Net sales	$ 127,348	$ 126,857	$ 386,889	$ 428,703
Net income	$ 1,560	$ (4,301)	$ 6,049	$ 11,414
Basic earnings per share	$ 0.05	$ (0.14)	$ 0.19	$ 0.37
Diluted earnings per share	$ 0.05	$ (0.14)	$ 0.19	$ 0.36

Goodwill and Purchased Intang44

Goodwill and Purchased Intangible Assets - Goodwill and Other Indefinite Lived Intangible Assets (Detail) - USD ($) $ in Thousands	Sep. 25, 2015	Dec. 26, 2014
Intangible Assets, Net (Including Goodwill) [Abstract]
Goodwill	$ 84,495	$ 55,918
Intangible Assets	44,952	16,824
Total	$ 129,447	$ 72,742

Goodwill and Purchased Intang45

Goodwill and Purchased Intangible Assets - Details of Purchased Intangible Assets (Detail) - USD ($) $ in Thousands	1 Months Ended		12 Months Ended
	Jul. 31, 2015	Feb. 28, 2015	Dec. 26, 2014	Sep. 25, 2015
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount			$ 31,487	$ 63,657
Accumulated Amortization			(14,663)	(18,705)
Carrying Value			16,824	44,952
American Integration Technologies LLC [Member] | Customer relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount			19,000	19,000
Accumulated Amortization			(13,011)	(14,726)
Carrying Value			$ 5,989	4,274
Useful Life (in years)			7 years
American Integration Technologies LLC [Member] | Trade name [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount			$ 1,900	1,900
Accumulated Amortization			(1,081)	(1,304)
Carrying Value			$ 819	596
Useful Life (in years)			6 years
American Integration Technologies LLC [Member] | Intellectual Properties/Know-How [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount			$ 1,600	1,600
Accumulated Amortization			(571)	(743)
Carrying Value			$ 1,029	857
Useful Life (in years)			7 years
Marchi Thermal Systems Inc [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount		$ 23,370
Marchi Thermal Systems Inc [Member] | Customer relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount		$ 9,900		9,900
Accumulated Amortization				(660)
Carrying Value				9,240
Useful Life (in years)		10 years	10 years
Marchi Thermal Systems Inc [Member] | Trade name [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount		$ 1,170		1,170
Accumulated Amortization				(158)
Carrying Value				1,012
Useful Life (in years)		6 years	6 years
Marchi Thermal Systems Inc [Member] | Intellectual Properties/Know-How [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount		$ 12,300		12,300
Accumulated Amortization				(919)
Carrying Value				11,381
Marchi Thermal Systems Inc [Member] | Intellectual Properties/Know-How [Member] | Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Useful Life (in years)		8 years	8 years
Marchi Thermal Systems Inc [Member] | Intellectual Properties/Know-How [Member] | Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Useful Life (in years)		12 years	12 years
Miconex [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 8,800
Miconex [Member] | Customer relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 8,800			8,800
Accumulated Amortization				(195)
Carrying Value				8,605
Useful Life (in years)	7 years 6 months		7 years 6 months
UCT [Member] | Trade name [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount			$ 8,987	8,987
Carrying Value			$ 8,987	$ 8,987

Goodwill and Purchased Intang46

Goodwill and Purchased Intangible Assets - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 25, 2015	Sep. 26, 2014	Sep. 25, 2015	Sep. 26, 2014
Finite-Lived Intangible Assets [Line Items]
Amortization of finite lived intangibles	$ 1,600	$ 1,200	$ 4,042	$ 3,663
American Integration Technologies LLC [Member] | Customer relationships [Member] | Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated economic lives for intangible assets			6 years
American Integration Technologies LLC [Member] | Customer relationships [Member] | Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated economic lives for intangible assets			7 years
American Integration Technologies LLC [Member] | Trade name [Member] | Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated economic lives for intangible assets			6 years
American Integration Technologies LLC [Member] | Trade name [Member] | Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated economic lives for intangible assets			7 years
Miconex [Member]
Finite-Lived Intangible Assets [Line Items]
Amortization of finite lived intangibles	200		$ 200
Miconex [Member] | Customer relationships [Member] | Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated economic lives for intangible assets			6 years
Miconex [Member] | Customer relationships [Member] | Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated economic lives for intangible assets			7 years
Miconex [Member] | Intellectual Properties/Know-How [Member] | Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated economic lives for intangible assets			7 years
Miconex [Member] | Intellectual Properties/Know-How [Member] | Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated economic lives for intangible assets			12 years
Marchi Thermal Systems Inc [Member]
Finite-Lived Intangible Assets [Line Items]
Amortization of finite lived intangibles	$ 700		$ 1,700
Marchi Thermal Systems Inc [Member] | Customer relationships [Member] | Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated economic lives for intangible assets			7 years
Marchi Thermal Systems Inc [Member] | Customer relationships [Member] | Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated economic lives for intangible assets			12 years
Marchi Thermal Systems Inc [Member] | Trade name [Member] | Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated economic lives for intangible assets			6 years
Marchi Thermal Systems Inc [Member] | Trade name [Member] | Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated economic lives for intangible assets			7 years
Marchi Thermal Systems Inc [Member] | Intellectual Properties/Know-How [Member] | Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated economic lives for intangible assets			7 years
Marchi Thermal Systems Inc [Member] | Intellectual Properties/Know-How [Member] | Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated economic lives for intangible assets			12 years

Goodwill and Purchased Intang47

Goodwill and Purchased Intangible Assets - Future Estimated Amortization Expense (Detail) $ in Thousands	Sep. 25, 2015USD ($)
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
2015 (remaining in year)	$ 1,648
2,016	6,062
2,017	5,142
2,018	4,582
2,019	4,210
Thereafter	14,321
Carrying amount	$ 35,965

Borrowing Arrangements - Additi

Borrowing Arrangements - Additional Information (Detail) - USD ($)	1 Months Ended	9 Months Ended
	Jan. 31, 2015	Sep. 25, 2015	Mar. 27, 2015	Feb. 05, 2015	Feb. 04, 2015	Feb. 02, 2015	Dec. 26, 2014
Debt Instrument [Line Items]
Unamortized debt issuance costs			$ 700,000
Outstanding amount of borrowing classified as long-term debt		$ 76,900,000
Amortization of debt discount		$ 600,000
Percentage of excess cash flow used for annual debt payment condition one		33.00%
New term loan principal amount outstanding condition one		$ 20,000,000
Percentage of excess cash flow used for annual debt payment condition two		25.00%
Minimum [Member]
Debt Instrument [Line Items]
Fixed charge coverage ratio for the next fiscal year		125.00%
New term loan principal amount outstanding condition two		$ 10,000,000
Maximum [Member]
Debt Instrument [Line Items]
Consolidated leverage ratio for first quarter of next fiscal year		350.00%
New term loan principal amount outstanding condition two		$ 20,000,000
Marchi Thermal Systems Inc [Member]
Debt Instrument [Line Items]
Outstanding amount of borrowing under credit facility				$ 29,700,000
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Outstanding amount of borrowing classified as long-term debt							$ 31,300,000
Revolving Credit Facility [Member] | Silicon Valley Bank [Member]
Debt Instrument [Line Items]
Maturity date of debt		Jul. 3, 2016
Base rate interest	3.75%
Term Loan Credit Facility [Member] | Silicon Valley Bank [Member]
Debt Instrument [Line Items]
Maturity date of debt		Jul. 3, 2016
New Term Loan Credit Facility [Member]
Debt Instrument [Line Items]
Maturity date of debt		Feb. 2, 2019
Base rate interest		2.70%
Outstanding amount of borrowing under credit facility						$ 40,000,000
Outstanding amounts		$ 37,500,000
New Term Loan Credit Facility [Member] | First Four Quarter [Member]
Debt Instrument [Line Items]
New term loan repaid		1,250,000
New Term Loan Credit Facility [Member] | Remaining Twelve Quarter [Member]
Debt Instrument [Line Items]
New term loan repaid		2,900,000
New Term Loan Credit Facility [Member] | Interest Rate Swap [Member]
Debt Instrument [Line Items]
Derivative instrument, notional amount		$ 20,000,000
New Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Credit agreement amendment date		Apr. 3, 2015
Outstanding amount of borrowing under credit facility						$ 6,500,000
New line of credit facility maturity period		4 years
Outstanding amounts		$ 36,200,000
New Revolving Credit Facility [Member] | Marchi Thermal Systems Inc [Member]
Debt Instrument [Line Items]
Outstanding amount of borrowing under credit facility				29,700,000
New Term Loan and New Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Unamortized debt issuance costs		500,000
Outstanding amount of borrowing classified as long-term debt		$ 73,200,000
Loan and Security Agreement [Member] | Revolving Credit Facility [Member] | Silicon Valley Bank [Member]
Debt Instrument [Line Items]
Borrowing capacity under credit facility					$ 40,000,000
Loan and Security Agreement [Member] | Term Loan Credit Facility [Member] | Silicon Valley Bank [Member]
Debt Instrument [Line Items]
Borrowing capacity under credit facility					$ 40,000,000
Base Rate Loans [Member]
Debt Instrument [Line Items]
Debt instrument interest rate		3.25%
Credit Agreement [Member] | New Term Loan Credit Facility [Member]
Debt Instrument [Line Items]
Borrowing capacity under credit facility				40,000,000
Debt instrument interest rate		2.50%
Outstanding amounts		$ 37,500,000
Credit Agreement [Member] | New Term Loan Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Debt instrument variable interest rate		0.20%
Credit Agreement [Member] | New Term Loan Credit Facility [Member] | Interest Rate Swap [Member]
Debt Instrument [Line Items]
Debt instrument interest rate		3.49%
Debt instrument LIBOR rate		0.99%
Credit Agreement [Member] | New Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Borrowing capacity under credit facility				40,000,000
Debt instrument interest rate		3.00%
Credit Agreement [Member] | Letter of Credit [Member]
Debt Instrument [Line Items]
Borrowing capacity under credit facility				20,000,000
Credit Agreement [Member] | Swing Line Sub-Facility [Member]
Debt Instrument [Line Items]
Borrowing capacity under credit facility				$ 5,000,000
Bank Debt [Member] | New Term Loan and New Revolving Credit Facility [Member] | Miconex [Member]
Debt Instrument [Line Items]
Outstanding amount of borrowing classified as long-term debt		$ 3,700,000
Debt Interest rate, minimum		1.30%
Debt Interest rate, maximum		10.50%
Debt due date, start year		2,015
Debt due date, end year		2,020

Income Taxes - Additional Infor

Income Taxes - Additional Information (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 25, 2015	Sep. 26, 2014	Sep. 25, 2015	Sep. 26, 2014	Dec. 26, 2014	Dec. 27, 2013
Income Taxes [Line Items]
Income tax provision	$ 647,000	$ 862,000	$ 2,028,000	$ 3,913,000
Effective tax rate	27.80%	19.60%	28.60%	33.30%
Undistributed earnings of foreign subsidiaries	$ 64,500,000		$ 64,500,000
Gross liability for unrecognized tax benefits	330,000	$ 345,000	$ 330,000	$ 345,000	$ 356,000	$ 165,000
Income tax holiday, description			The Company is currently enjoying a zero rate tax holiday related to its Singapore subsidiary that will expire for tax years beginning January 2016.
Income tax holiday, amount			$ 0
Net profit	1,676,000	$ (5,262,000)	5,056,000	$ 7,825,000
Singapore [Member]
Income Taxes [Line Items]
Net profit	$ 1,700,000		$ 6,200,000

Income Taxes - Activity Related

Income Taxes - Activity Related to Company's Unrecognized Tax Benefits (Detail) - USD ($) $ in Thousands	9 Months Ended
	Sep. 25, 2015	Sep. 26, 2014
Income Tax Disclosure [Abstract]
Balance as of the beginning of period	$ 356	$ 165
Increase (decrease) related to current year tax positions	(26)	180
Balance as of the end of period	$ 330	$ 345

Net Income Per Share - Basic an

Net Income Per Share - Basic and Diluted Net Income Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 25, 2015	Sep. 26, 2014	Sep. 25, 2015	Sep. 26, 2014
Numerator:
Net income (loss)	$ 1,676	$ (5,262)	$ 5,056	$ 7,825
Shares used in computation - basic:
Weighted average common shares outstanding	31,993	29,477	31,359	29,242
Shares used in computation - diluted:
Weighted average common shares outstanding	31,993	29,477	31,359	29,242
Dilutive effect of common shares outstanding subject to repurchase	110		222	261
Dilutive effect of options outstanding	52		72	409
Weighted average shares used in computing diluted net income per share	32,155	29,477	31,653	29,912
Net income (loss) per share - basic	$ 0.05	$ (0.18)	$ 0.16	$ 0.27
Net income (loss) per share - diluted	$ 0.05	$ (0.18)	$ 0.16	$ 0.26

Net Income Per Share - Addition

Net Income Per Share - Additional Information (Detail) - shares	3 Months Ended	9 Months Ended
	Sep. 25, 2015	Sep. 25, 2015	Sep. 26, 2014
Employee stock options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share	204,154	281,507	268,706

Commitments and Contingencies -

Commitments and Contingencies - Additional Information (Detail) $ in Millions	9 Months Ended
	Sep. 25, 2015USD ($)
Long-term Purchase Commitment [Line Items]
Operating lease expiration period	Various dates through 2022
Inventory [Member]
Long-term Purchase Commitment [Line Items]
Purchase commitments	$ 36.5

Commitments and Contingencies54

Commitments and Contingencies - Summary of Future Minimum Payments under Operating Leases (Detail) $ in Thousands	Sep. 25, 2015USD ($)
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
2015 (remaining in year)	$ 1,687
2,016	6,136
2,017	5,662
2,018	4,479
2,019	3,276
Thereafter	8,715
Total minimum lease payments	$ 29,955

Segment and Geographic Inform55

Segment and Geographic Information - Additional Information (Detail) $ in Millions	9 Months Ended
	Sep. 25, 2015USD ($)Segment	Sep. 26, 2014USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments	1
Number of operating segments	1
Other Asia [Member]
Segment Reporting Information [Line Items]
Net long-lived assets | $	$ 9.8	$ 3.9
Czech Republic [Member]
Segment Reporting Information [Line Items]
Net long-lived assets | $	$ 0.5

Segment and Geographic Inform56

Segment and Geographic Information - Revenue by Geographic Area (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 25, 2015	Sep. 26, 2014	Sep. 25, 2015	Sep. 26, 2014
Segment Reporting Information [Line Items]
Sales	$ 122,816	$ 117,041	$ 365,683	$ 393,942
United States [Member]
Segment Reporting Information [Line Items]
Sales	82,708	82,310	252,138	282,336
China [Member]
Segment Reporting Information [Line Items]
Sales	1,017	16,035	18,267	52,461
Singapore [Member]
Segment Reporting Information [Line Items]
Sales	29,952	13,277	77,354	43,942
Austria [Member]
Segment Reporting Information [Line Items]
Sales	5,059		5,059
Other [Member]
Segment Reporting Information [Line Items]
Sales	$ 4,080	$ 5,419	$ 12,865	$ 15,203