Ultra Clean (UCTT) 10-Q 2 May 16 2016 Q1 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	3 Months Ended
	Mar. 25, 2016	Apr. 27, 2016
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 25, 2016
Document Fiscal Year Focus	2,016
Document Fiscal Period Focus	Q1
Trading Symbol	UCTT
Entity Registrant Name	Ultra Clean Holdings, Inc.
Entity Central Index Key	1,275,014
Current Fiscal Year End Date	--12-30
Entity Filer Category	Accelerated Filer
Entity Common Stock, Shares Outstanding		32,599,674

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 25, 2016	Dec. 25, 2015
Current assets:
Cash and cash equivalents	$ 45,539	$ 50,103
Accounts receivable, net of allowance of $159 and $158, respectively	66,669	59,148
Inventories	81,995	72,716
Prepaid expenses and other	6,517	8,172
Total current assets	200,720	190,139
Equipment and leasehold improvements, net	17,915	17,267
Goodwill	85,248	85,248
Purchased intangibles, net	41,342	42,782
Other non-current assets	725	717
Total assets	345,950	336,153
Current liabilities:
Bank borrowings	13,789	12,744
Accounts payable	52,951	39,660
Accrued compensation and related benefits	5,000	6,536
Deferred rent, current portion	592	584
Other current liabilities	7,372	5,187
Total current liabilities	79,704	64,711
Bank borrowings, net of current portion	59,870	62,795
Deferred tax liability	4,914	4,519
Deferred rent and other liabilities	3,037	3,185
Total liabilities	$ 147,525	$ 135,210
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; 32,505,755 and 32,279,429 shares issued and outstanding in 2016 and 2015, respectively	$ 33	$ 32
Additional paid-in capital	176,940	176,280
Common shares held in treasury, at cost, 601,944 shares in 2016 and 2015, respectively	(3,337)	(3,337)
Retained earnings	24,747	27,986
Accumulated other comprehensive income (loss)	42	(18)
Total stockholders' equity	198,425	200,943
Total liabilities and stockholders' equity	$ 345,950	$ 336,153

Condensed Consolidated Balance3

Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Mar. 25, 2016	Dec. 25, 2015
Statement of Financial Position [Abstract]
Account receivable, allowance	$ 159	$ 158
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	32,505,755	32,279,429
Common stock, shares outstanding	32,505,755	32,279,429
Treasury stock, shares	601,944	601,944

Condensed Consolidated Statemen

Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 25, 2016	Mar. 27, 2015
Income Statement [Abstract]
Sales	$ 112,229	$ 125,318
Cost of goods sold	97,659	105,399
Gross profit	14,570	19,919
Operating expenses:
Research and development	2,276	2,566
Sales and marketing	2,933	2,845
General and administrative	10,059	11,860
Total operating expenses	15,268	17,271
Income (loss) from operations	(698)	2,648
Interest and other income (expense), net	(1,091)	(956)
Income (loss) before provision for income taxes	(1,789)	1,692
Income tax provision	1,450	519
Net income (loss)	$ (3,239)	$ 1,173
Net income (loss) per share:
Basic	$ (0.10)	$ 0.04
Diluted	$ (0.10)	$ 0.04
Shares used in computing net income (loss) per share:
Basic	32,309	30,485
Diluted	32,309	30,964

Condensed Consolidated Stateme5

Condensed Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended
	Mar. 25, 2016	Mar. 27, 2015
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ (3,239)	$ 1,173
Other comprehensive income (loss):
Change in cumulative translation adjustment	97
Cash flow hedges:
Change in fair value of derivatives	(64)
Adjustment for net loss realized and included in net income	27
Total change in unrealized loss on derivative instruments	(37)
Other comprehensive gain	60
Comprehensive income (loss)	$ (3,179)	$ 1,173

Condensed Consolidated Stateme6

Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 25, 2016	Mar. 27, 2015
Cash flows from operating activities:
Net income (loss)	$ (3,239)	$ 1,173
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization	1,397	904
Amortization of finite-lived intangibles	1,440	1,137
Amortization of debt issuance costs	38	714
Stock-based compensation	1,065	474
Change in the fair value of the contingent earn out	421
Excess tax benefit from stock-based compensation		129
Changes in assets and liabilities, net of effects of acquisition:
Accounts receivable	(7,479)	(7,808)
Inventories	(9,173)	(1,765)
Prepaid expenses and other	1,673	(1,088)
Deferred income taxes	393	325
Other non-current assets	(8)	(54)
Accounts payable	13,244	(6)
Accrued compensation and related benefits	(1,546)	2
Income taxes payable		(129)
Other liabilities	1,578	340
Net cash used for operating activities	(196)	(5,652)
Cash flows from investing activities:
Acquisition of business		(29,734)
Purchases of equipment and leasehold improvements	(2,030)	(2,582)
Net cash used for investing activities	(2,030)	(32,316)
Cash flows from financing activities:
Proceeds from bank borrowings	1,637	76,189
Proceeds from issuance of common stock		2,192
Principal payments on bank borrowings	(3,566)	(48,844)
Payments of debt issuance costs		(500)
Excess tax benefit from stock-based compensation		(129)
Employees' taxes paid upon vesting of restricted stock units	(404)	(330)
Net cash provided by (used for) financing activities	(2,333)	28,578
Effect of exchange rate changes on cash and cash equivalents	(5)
Net decrease in cash	(4,564)	(9,390)
Cash and cash equivalents at beginning of period	50,103	78,997
Cash and cash equivalents at end of period	45,539	69,607
Supplemental cash flow information:
Income taxes paid	143	598
Income tax refunds	598
Interest paid	692	689
Non-cash investing activities:
Fair value of common shares issued for acquisition		13,843
Equipment and leasehold improvements purchased included in accounts payable	$ 146	$ 1,538

Organization and Significant Ac

Organization and Significant Accounting Policies	3 Months Ended
	Mar. 25, 2016
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 and equipment industry segments with similar requirements including consumer, medical and flat panel display. The Company focuses on providing specialized engineering and manufacturing solutions for these highly complex, highly configurable, limited volume 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, 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 while maintaining high quality standards for the Company’s customers. The Company believes that these characteristics allow the Company to provide global solutions for its customers’ 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, UCTS, UCME, UCAP, Marchi and Miconex. The Company’s international sales represented 43.9% and 31.8% of total sales for the three months ended March 25, 2016 and March 27, 2015, 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 Concentration of Credit Risk Significant sales to customers Three months ended March 25, March 27, Lam Research Corporation 56.6 % 46.7 % Applied Materials, Inc. 23.1 28.9 Total 79.7 % 75.6 % Three customers’ accounts receivable balances, Applied Materials, Inc., Lam Research Corporation and ASM International, were individually greater than 10% of accounts receivable as of March 25, 2016 and December 25, 2015 and in the aggregate represented approximately 90.5% and 84.6% 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. The following table summarizes, for assets or liabilities measured at fair value, the respective fair value and the classification by level of input within the fair value hierarchy (in thousands): Fair Value Measurement at Description March 25, 2016 Quoted Prices in Significant Significant Other liabilities: Interest rate swap $ 68 $ — $ 68 $ — Contingent earn-out liability $ 1,252 $ — $ — $ 1,252 Fair Value Measurement at Description December 25, 2015 Quoted Prices in Significant Significant Cash and cash equivalents: Money market fund deposits $ 640 $ 640 $ — $ — Other liabilities: Interest rate swap $ 23 $ — $ 23 $ — Contingent earn-out liability $ 831 $ — $ — $ 831 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 — Income Taxes The Company continued to maintain a full valuation allowance on its federal, state, and one of its Singapore subsidiary’s deferred tax amounts as of March 25, 2016. 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 The Company assesses collectability based on the credit worthiness of the customer and past transaction history. The Company performs on-going credit evaluations of customers and generally does not require collateral from customers. 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 straight-line 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 three months ended March 25, 2016: Shares Weighted Weighted Aggregate Outstanding at December 25, 2015 315,648 $ 10.02 2.06 $ 216 Granted — — Exercised — — Canceled (2,220 ) $ 8.96 Outstanding at March 25, 2016 313,428 $ 10.03 1.83 $ 180 Options exercisable at March 25, 2016 313,428 $ 10.03 1.83 $ 180 There were no options granted by the Company during either of the three month periods ended March 25, 2016 and March 27, 2015. As of March 25, 2016, 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 Restricted Stock Awards The following table summarizes the Company’s RSU and RSA activity for the three months ended March 25, 2016: Shares Aggregate Unvested restricted stock units and restricted stock awards at December 25, 2015 1,267,942 $ 6,563 Granted 644,000 Vested (304,843 ) Forfeited (35,543 ) Unvested restricted stock units and restricted stock awards at March 25, 2016 1,571,556 $ 7,984 Vested and expected to vest restricted stock units and restricted stock awards at March 25, 2016 1,267,799 $ 6,440 The following table shows the Company’s stock-based compensation expense included in the condensed consolidated statements of operations (in thousands): Three months ended March 25, March 27, Cost of sales (1) $ 276 $ 382 Research and development 61 50 Sales and marketing 77 111 General and administrative 651 (69 ) 1,065 474 Income tax benefit — (146 ) Net stock-based compensation expense $ 1,065 $ 328 (1) Stock-based compensation expenses capitalized in inventory for the three month periods ended March 25, 2016 and March 27, 2015 were not significant. Recent Accounting Pronouncements In May 2014, the Financial Accounting Standards Board (FASB) amended the existing accounting standards for revenue recognition. In August 2015, the FASB delayed the effective date of the amended accounting standard for revenue recognition by one year. The FASB also agreed to allow entities to choose to adopt the standard as of the original effective date. As such, the updated standard will be effective for us in the first quarter of 2018, with the option to adopt it in the first quarter of 2017. The Company is still evaluating the effect that the updated standard will have on the consolidated financial statements and related disclosures. 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 or the retail inventory method but applies to all other inventory including those measured using first-in, first-out 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. In November 2015, the FASB issued authoritative guidance on income taxes, which simplifies the presentation of deferred income taxes by requiring deferred tax assets and liabilities be classified as noncurrent on the balance sheet. The updated standard is effective for us beginning on January 1, 2017 with early application permitted as of the beginning of any interim or annual reporting period. The Company is currently evaluating the effect of this new guidance on the Company’s consolidated financial statements. In February 2016, the FASB issued new guidance related to how an entity should recognize lease assets and lease liabilities. The guidance specifies that an entity who is a lessee under lease agreements should recognize lease assets and lease liabilities for those leases classified as operating leases under previous FASB guidance. The guidance is effective beginning in the first quarter of 2019. Early adoption is permitted. In transition, lessees and lessors are required to recognize and measure leases at the beginning of the earliest period presented using a modified retrospective approach. The Company is evaluating the impact of adopting this guidance on the Company’s consolidated financial statements. In March 2016, the FASB issued new guidance which involves several aspects of the accounting for share-based payment transactions including the income tax consequences, classification of awards as either equity or liabilities, and classification on the statement of cash flows. Under the new standard, income tax benefits and deficiencies are to be recognized as income tax expense or benefit in the income statement and the tax effects of exercised or vested awards should be treated as discrete items in the reporting period in which they occur. An entity should also recognize excess tax benefits regardless of whether the benefit reduces taxes payable in the current period. Excess tax benefits should be classified along with other income tax cash flows as an operating activity. In regards to forfeitures, the entity may make an entity-wide accounting policy election to either estimate the number of awards that are expected to vest or account for forfeitures when they occur. The guidance is effective for fiscal years beginning after December 15, 2016 including interim periods within that reporting period, however early adoption is permitted. The Company is currently evaluating the guidance to determine the Company’s adoption method and the effect it will have on the Company’s consolidated financial statements.

Financial Instruments

Financial Instruments	3 Months Ended
	Mar. 25, 2016
Investments, All Other Investments [Abstract]
Financial Instruments	2. Financial Instruments Cash Equivalents As of December 25, 2015, the Company had 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. The carrying value and fair value of these money market funds as of December 25, 2015 was $0.6 million, based on Level 1 inputs. There were no money market funds as of March 25, 2015. 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 1 of the Company’s Condensed Consolidated Financial Statements as the valuation inputs are based on quoted prices and market observable data of similar instruments. The Company does not use derivatives for speculative or trading purposes. 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 0.44%, as of March 25, 2016. This interest rate swap effectively locks in a fixed interest rate of 3.74% on $18.7 million of the $35.0 million term loan as of March 25, 2016, 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 (expense), net. As of March 25, 2016, the effective portion of the Company’s cash flow hedge before tax effect was $64,000, of which $53,700 is expected to be reclassified from AOCI into earnings within the next 12 months. Non-Designated Derivatives Miconex interest swap to convert the variable interest rates on Miconex debt to fixed rates with a total notional amount of $0.4 million is not designated as hedging instruments. The Company recognizes gains and losses on this contract, as well any related costs in interest and other income (expense), net. 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 March 25, 2016 and December 25, 2015. March 25, 2016 Balance Sheet Fair Value of Fair Value of Total Derivative liabilities: Level 2: Interest rate swap Deferred rent and other liabilities $ 57 $ 11 $ 68 25-Dec-15 Balance Sheet Fair Value of Fair Value of Total Derivative liabilities: Level 2: Interest rate swap Deferred rent and other liabilities $ 23 $ 10 $ 33 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 Three Months Ended March 25, March 27, Derivatives in Cash Flow Hedging Relationship Interest rate swap $ (64 ) $ — Gains Reclassified from AOCI into Income (Effective Portion) Three Months Ended Income Statement Location March 25, March 27, Derivatives in Cash Flow Hedging Relationship Interest rate swap Interest and other income (expense), net $ 27 $ — 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 months ended March 25, 2016 and March 27, 2015. The effect of derivative instruments not designated as hedging instruments on income for the three months ended March 25, 2016 and March 27, 2015 is not significant to the financial statements.

Balance Sheet Information

Balance Sheet Information	3 Months Ended
	Mar. 25, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Balance Sheet Information	3. Balance Sheet Information Inventories consisted of the following (in thousands): March 25, December 25, Raw materials $ 62,282 $ 57,321 Work in process 21,762 17,954 Finished goods 5,163 4,561 89,207 79,836 Reserve for excess and obsolete (7,212 ) (7,120 ) Total $ 81,995 $ 72,716 Equipment and leasehold improvements, net, consisted of the following (in thousands): March 25, December 25, Computer equipment and software $ 10,898 $ 10,308 Furniture and fixtures 3,187 3,201 Machinery and equipment 16,424 16,253 Leasehold improvements 17,432 16,119 47,941 45,881 Accumulated depreciation (30,026 ) (28,614 ) Total $ 17,915 $ 17,267

Acquisitions

Acquisitions	3 Months Ended
	Mar. 25, 2016
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 expanded the Company’s capabilities with existing customers. Pursuant to the purchase agreement, the Company paid $15.6 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 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 $20.7 million, which includes the cash payment of $15.6 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 Consolidated Financial Statements. During the first quarter of fiscal year 2016, the Company reassessed the fair value of the earn-out payments, increasing the fair value from $0.8 million as of December 25, 2015 to $1.2 million as of March 25, 2016. The increase of $0.4 million was recorded as other expense in the condensed consolidated statements of operations. 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 of Miconex yet to be finalized relate to the fair value of 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 10,950 Purchased intangible assets 8,800 Total assets acquired 30,090 Bank borrowings (3,027 ) Accounts payable (3,509 ) Accrued compensation and related benefits (432 ) Other current liabilities (576 ) Deferred tax liability (1,856 ) Other liabilities (24 ) Total liabilities assumed (9,424 ) Purchase price allocated $ 20,666 Useful Purchased (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. 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 purchase price of Marchi to the tangible assets, liabilities and identifiable intangible assets acquired, based on their calculated 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 results of operations for the Company for the first quarter of fiscal 2015 include two full months of operating activity for Marchi. For the three months ended March 27, 2015, net sales of approximately $2.1 million and operating income of approximately $0.7 million attributable to Marchi were included in the consolidated results of operations. For the three months ended March 27, 2015, results of operations included charges of $0.4 million and $0.2 million, respectively, attributable to amortization of purchased intangible assets and deal costs associated with the acquisition. Deal costs are included in general and administrative expenses in the Company’s consolidated results of operations. The 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 Purchased (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 following unaudited pro forma consolidated results of operations assume the Marchi and Miconex acquisitions were completed as of the beginning of 2015 (in thousands, except per share amounts): Three Months March 27, Net sales $ 134,964 Net income $ 1,971 Basic earnings per share $ 0.06 Diluted earnings per share $ 0.06 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 months ended March 27, 2015 include acquisition related costs of $0.2 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	3 Months Ended
	Mar. 25, 2016
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 purchase 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. 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): March 25, 2016 December 25, 2015 Goodwill Intangible Total Goodwill Intangible Total Carrying amount $ 85,248 $ 41,342 $ 126,590 $ 85,248 $ 42,782 $ 128,030 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 March 25, 2016 As of December 25, 2015 Gross Accumulated Carrying Gross Accumulated Carrying Useful AIT Customer relationships $ 19,000 $ (15,738 ) $ 3,262 $ 19,000 $ (15,298 ) $ 3,702 7 Tradename 1,900 (1,900 ) — 1,900 (1,900 ) — 6 Intellectual property/know-how 1,600 (857 ) 743 1,600 (800 ) 800 7 Marchi Customer relationships 9,900 (1,155 ) 8,745 9,900 (907 ) 8,993 10 Tradename 1,170 (274 ) 896 1,170 (217 ) 953 6 Intellectual property/know-how 12,300 (1,609 ) 10,691 12,300 (1,264 ) 11,036 8-12 Miconex Customer relationships 8,800 (782 ) 8,018 8,800 (489 ) 8,311 7.5 UCT Tradename 8,987 — 8,987 8,987 — 8,987 * Total $ 63,657 $ (22,315 ) $ 41,342 $ 63,657 $ (20,875 ) $ 42,782 * 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 $1.4 million and $1.2 million for the three months ended March 25, 2016 and March 27, 2015, respectively. Amortization expense is charged to general and administrative. As of March 25, 2016, future estimated amortization expense is expected to be as follows (in thousands): Amortization 2016 (remaining in year) $ 4,318 2017 4,924 2018 4,582 2019 4,210 2020 3,682 Thereafter 10,639 Total $ 32,355

Borrowing Arrangements

Borrowing Arrangements	3 Months Ended
	Mar. 25, 2016
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. In addition, the Company expensed the unamortized debt issuance costs relating to the prior loan agreement 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 March 25, 2016, the interest rates on the outstanding New Term Loan and New Revolving Credit facility were 3.19% (2.75% applicable margin and 0.44% LIBOR) and 3.5% 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 (which amount decreases based on prorated quarterly principal payments over the remaining period of the New Term Loan) 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 0.44%, as of March 25, 2016. This interest rate swap effectively locks in a fixed interest rate of 3.74% on $18.7 million of the $35.0 million term loan balance outstanding as of March 25, 2016. 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 3.50 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. In December 2015, the Credit Agreement was amended to add a covenant requiring the Company to maintain a cash balance of $35.0 million at the end of each quarter. The Company was in compliance with all covenants for the quarter ended March 25, 2016. 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 March 25, 2016, the outstanding amounts under the New Term Loan and New Revolving Credit Facility were $35.0 million and $36.2 million, respectively, which are gross of unamortized debt issuance costs of $0.4 million for a total net debt balance of $70.8 million. In addition to the New Term Loan and New Revolving loan, the Company has $2.9 million of bank debt under a credit facility in the Czech Republic, with an interest rate of 1.3% and a variable rate based on the Euro Interbank Offered Rate and due dates from 2016 to 2020. As of March 25, 2016, our total bank debt was $73.7 million.

Income Tax

Income Tax	3 Months Ended
	Mar. 25, 2016
Income Tax Disclosure [Abstract]
Income Tax	7. Income Tax The Company’s income tax provision and effective tax rate for the three month period ended March 25, 2016 were $1.4 million and (80.8)%, respectively compared to $0.5 million and 30.7% respectively for the three month period ended March 27, 2015. 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 in jurisdictions with full federal and state valuation allowances for the three period ended March 25, 2016 compared to the impact of losses in jurisdictions with full state valuation allowances for the three month period ended March 27, 2015. Our effective tax rate was higher than the statutory rate for the first three months of 2016 primarily due to the impact of loss in jurisdictions with a full federal and state valuation allowances. Our effective tax rate was lower than the statutory rates for the first three months of 2015 primarily due to the geographic distribution of our world-wide earnings in foreign jurisdictions with lower tax rates. Company management continuously evaluates the need for a valuation allowance and, as of March 25, 2016, concluded that a full valuation allowance on its federal and state deferred tax assets as well as the deferred tax assets of one its Singapore subsidiaries was still appropriate. The Company earns a significant amount of its operating income outside the United States, almost all of it is 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 any other funds to the U.S., except for a portion of current year earnings from one of our Singapore subsidiaries. The Company expects 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 2016, 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 March 25, 2016, the Company had undistributed earnings of foreign subsidiaries that are indefinitely invested outside of the U.S. of approximately $71.4 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): Three months ended March 25, March 27, Balance as of the beginning of period $ 337 $ 356 Increase (decrease) related to current year tax 2 18 Balance as of the end of period $ 339 $ 374 The Company’s gross liability for unrecognized tax benefits as of March 25, 2016 and December 25, 2015 was $0.3 million and $0.4 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 considered to be de minimis for each of the three month period ended March 25, 2016 and March 27, 2015. 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 2011 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.

Net Income Per Share

Net Income Per Share	3 Months Ended
	Mar. 25, 2016
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 March 25, March 27, Numerator: Net income (loss) $ (3,239 ) $ 1,173 Denominator: Shares used in computation — basic: Weighted average common shares outstanding 32,309 30,485 Shares used in computation — diluted: Shares used in computing basic net income (loss) per share 32,309 30,485 Dilutive effect of common shares outstanding subject to repurchase — 333 Dilutive effect of options outstanding — 146 Weighted average shares used in computing diluted net income (loss) per share 32,309 30,964 Net income (loss) per share — basic $ (0.10 ) $ 0.04 Net income (loss) per share — diluted $ (0.10 ) $ 0.04 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 196,286 for the three month period ended March 25, 2016 and 277,648 for the three month period ended March 27, 2015. For the three months period ended March 25, 2016, all potentially dilutive securities outstanding were considered anti-dilutive, and therefore the calculation of basic and diluted net loss per share was the same.

Commitments and Contingencies

Commitments and Contingencies	3 Months Ended
	Mar. 25, 2016
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	9. Commitments and Contingencies The Company had commitments to purchase inventory totaling approximately $44.1 million at March 25, 2016. 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 the Czech Republic. The Company leases certain of its facilities under non-cancelable leases, which expire on various dates through 2022. As of March 25, 2016, future minimum payments under these operating leases were as follows (in thousands): Fiscal Year 2016 (remaining in year) $ 5,043 2017 5,857 2018 4,525 2019 3,557 2020 3,362 Thereafter 5,361 Total minimum lease payments $ 27,705 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	3 Months Ended
	Mar. 25, 2016
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 the 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 March 25, March 27, United States $ 65,839 $ 89,468 China 3,447 11,962 Singapore 32,684 18,233 Austria 8,502 — Other 1,757 5,655 $ 112,229 $ 125,318 At March 25, 2016, approximately $8.5 million and $1.8 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 March 27, 2015, approximately $8.5 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)	3 Months Ended
	Mar. 25, 2016
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
Concentration of Credit Risk	Concentration of Credit Risk
Significant sales to customers	Significant sales to customers Three months ended March 25, March 27, Lam Research Corporation 56.6 % 46.7 % Applied Materials, Inc. 23.1 28.9 Total 79.7 % 75.6 % Three customers’ accounts receivable balances, Applied Materials, Inc., Lam Research Corporation and ASM International, were individually greater than 10% of accounts receivable as of March 25, 2016 and December 25, 2015 and in the aggregate represented approximately 90.5% and 84.6% 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. The following table summarizes, for assets or liabilities measured at fair value, the respective fair value and the classification by level of input within the fair value hierarchy (in thousands): Fair Value Measurement at Description March 25, 2016 Quoted Prices in Significant Significant Other liabilities: Interest rate swap $ 68 $ — $ 68 $ — Contingent earn-out liability $ 1,252 $ — $ — $ 1,252 Fair Value Measurement at Description December 25, 2015 Quoted Prices in Significant Significant Cash and cash equivalents: Money market fund deposits $ 640 $ 640 $ — $ — Other liabilities: Interest rate swap $ 23 $ — $ 23 $ — Contingent earn-out liability $ 831 $ — $ — $ 831
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 —
Income Taxes	Income Taxes The Company continued to maintain a full valuation allowance on its federal, state, and one of its Singapore subsidiary’s deferred tax amounts as of March 25, 2016. 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 The Company assesses collectability based on the credit worthiness of the customer and past transaction history. The Company performs on-going credit evaluations of customers and generally does not require collateral from customers.
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 straight-line 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 three months ended March 25, 2016: Shares Weighted Weighted Aggregate Outstanding at December 25, 2015 315,648 $ 10.02 2.06 $ 216 Granted — — Exercised — — Canceled (2,220 ) $ 8.96 Outstanding at March 25, 2016 313,428 $ 10.03 1.83 $ 180 Options exercisable at March 25, 2016 313,428 $ 10.03 1.83 $ 180 There were no options granted by the Company during either of the three month periods ended March 25, 2016 and March 27, 2015. As of March 25, 2016, 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 Restricted Stock Awards The following table summarizes the Company’s RSU and RSA activity for the three months ended March 25, 2016: Shares Aggregate Unvested restricted stock units and restricted stock awards at December 25, 2015 1,267,942 $ 6,563 Granted 644,000 Vested (304,843 ) Forfeited (35,543 ) Unvested restricted stock units and restricted stock awards at March 25, 2016 1,571,556 $ 7,984 Vested and expected to vest restricted stock units and restricted stock awards at March 25, 2016 1,267,799 $ 6,440 The following table shows the Company’s stock-based compensation expense included in the condensed consolidated statements of operations (in thousands): Three months ended March 25, March 27, Cost of sales (1) $ 276 $ 382 Research and development 61 50 Sales and marketing 77 111 General and administrative 651 (69 ) 1,065 474 Income tax benefit — (146 ) Net stock-based compensation expense $ 1,065 $ 328 (1) Stock-based compensation expenses capitalized in inventory for the three month periods ended March 25, 2016 and March 27, 2015 were not significant.
Recent Accounting Pronouncements	Recent Accounting Pronouncements In May 2014, the Financial Accounting Standards Board (FASB) amended the existing accounting standards for revenue recognition. In August 2015, the FASB delayed the effective date of the amended accounting standard for revenue recognition by one year. The FASB also agreed to allow entities to choose to adopt the standard as of the original effective date. As such, the updated standard will be effective for us in the first quarter of 2018, with the option to adopt it in the first quarter of 2017. The Company is still evaluating the effect that the updated standard will have on the consolidated financial statements and related disclosures. 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 or the retail inventory method but applies to all other inventory including those measured using first-in, first-out 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. In November 2015, the FASB issued authoritative guidance on income taxes, which simplifies the presentation of deferred income taxes by requiring deferred tax assets and liabilities be classified as noncurrent on the balance sheet. The updated standard is effective for us beginning on January 1, 2017 with early application permitted as of the beginning of any interim or annual reporting period. The Company is currently evaluating the effect of this new guidance on the Company’s consolidated financial statements. In February 2016, the FASB issued new guidance related to how an entity should recognize lease assets and lease liabilities. The guidance specifies that an entity who is a lessee under lease agreements should recognize lease assets and lease liabilities for those leases classified as operating leases under previous FASB guidance. The guidance is effective beginning in the first quarter of 2019. Early adoption is permitted. In transition, lessees and lessors are required to recognize and measure leases at the beginning of the earliest period presented using a modified retrospective approach. The Company is evaluating the impact of adopting this guidance on the Company’s consolidated financial statements. In March 2016, the FASB issued new guidance which involves several aspects of the accounting for share-based payment transactions including the income tax consequences, classification of awards as either equity or liabilities, and classification on the statement of cash flows. Under the new standard, income tax benefits and deficiencies are to be recognized as income tax expense or benefit in the income statement and the tax effects of exercised or vested awards should be treated as discrete items in the reporting period in which they occur. An entity should also recognize excess tax benefits regardless of whether the benefit reduces taxes payable in the current period. Excess tax benefits should be classified along with other income tax cash flows as an operating activity. In regards to forfeitures, the entity may make an entity-wide accounting policy election to either estimate the number of awards that are expected to vest or account for forfeitures when they occur. The guidance is effective for fiscal years beginning after December 15, 2016 including interim periods within that reporting period, however early adoption is permitted. The Company is currently evaluating the guidance to determine the Company’s adoption method and the effect it will have on the Company’s consolidated financial statements.

Organization and Significant 18

Organization and Significant Accounting Policies (Tables)	3 Months Ended
	Mar. 25, 2016
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 March 25, March 27, Lam Research Corporation 56.6 % 46.7 % Applied Materials, Inc. 23.1 28.9 Total 79.7 % 75.6 %
Assets or Liabilities Measured at Fair Value	The following table summarizes, for assets or liabilities measured at fair value, the respective fair value and the classification by level of input within the fair value hierarchy (in thousands): Fair Value Measurement at Description March 25, 2016 Quoted Prices in Significant Significant Other liabilities: Interest rate swap $ 68 $ — $ 68 $ — Contingent earn-out liability $ 1,252 $ — $ — $ 1,252 Fair Value Measurement at Description December 25, 2015 Quoted Prices in Significant Significant Cash and cash equivalents: Money market fund deposits $ 640 $ 640 $ — $ — Other liabilities: Interest rate swap $ 23 $ — $ 23 $ — Contingent earn-out liability $ 831 $ — $ — $ 831
Schedule of Option Activity	Stock option activity for the three months ended March 25, 2016: Shares Weighted Weighted Aggregate Outstanding at December 25, 2015 315,648 $ 10.02 2.06 $ 216 Granted — — Exercised — — Canceled (2,220 ) $ 8.96 Outstanding at March 25, 2016 313,428 $ 10.03 1.83 $ 180 Options exercisable at March 25, 2016 313,428 $ 10.03 1.83 $ 180
Summary of Restricted Stock Unit and Restricted Stock Award Activity	The following table summarizes the Company’s RSU and RSA activity for the three months ended March 25, 2016: Shares Aggregate Unvested restricted stock units and restricted stock awards at December 25, 2015 1,267,942 $ 6,563 Granted 644,000 Vested (304,843 ) Forfeited (35,543 ) Unvested restricted stock units and restricted stock awards at March 25, 2016 1,571,556 $ 7,984 Vested and expected to vest restricted stock units and restricted stock awards at March 25, 2016 1,267,799 $ 6,440
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 March 25, March 27, Cost of sales (1) $ 276 $ 382 Research and development 61 50 Sales and marketing 77 111 General and administrative 651 (69 ) 1,065 474 Income tax benefit — (146 ) Net stock-based compensation expense $ 1,065 $ 328 (1) Stock-based compensation expenses capitalized in inventory for the three month periods ended March 25, 2016 and March 27, 2015 were not significant.

Financial Instruments (Tables)

Financial Instruments (Tables)	3 Months Ended
	Mar. 25, 2016
Investments, All Other Investments [Abstract]
Schedule of Derivative Instruments at Gross Fair Value	The following tables show the Company’s derivative instruments at gross fair value (in thousands) as of March 25, 2016 and December 25, 2015. March 25, 2016 Balance Sheet Fair Value of Fair Value of Total Derivative liabilities: Level 2: Interest rate swap Deferred rent and other liabilities $ 57 $ 11 $ 68 25-Dec-15 Balance Sheet Fair Value of Fair Value of Total Derivative liabilities: Level 2: Interest rate swap Deferred rent and other liabilities $ 23 $ 10 $ 33
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 Three Months Ended March 25, March 27, Derivatives in Cash Flow Hedging Relationship Interest rate swap $ (64 ) $ — Gains Reclassified from AOCI into Income (Effective Portion) Three Months Ended Income Statement Location March 25, March 27, Derivatives in Cash Flow Hedging Relationship Interest rate swap Interest and other income (expense), net $ 27 $ —

Balance Sheet Information (Tabl

Balance Sheet Information (Tables)	3 Months Ended
	Mar. 25, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Summary of Inventories	Inventories consisted of the following (in thousands): March 25, December 25, Raw materials $ 62,282 $ 57,321 Work in process 21,762 17,954 Finished goods 5,163 4,561 89,207 79,836 Reserve for excess and obsolete (7,212 ) (7,120 ) Total $ 81,995 $ 72,716
Equipment and Leasehold Improvements, Net	Equipment and leasehold improvements, net, consisted of the following (in thousands): March 25, December 25, Computer equipment and software $ 10,898 $ 10,308 Furniture and fixtures 3,187 3,201 Machinery and equipment 16,424 16,253 Leasehold improvements 17,432 16,119 47,941 45,881 Accumulated depreciation (30,026 ) (28,614 ) Total $ 17,915 $ 17,267

Acquisitions (Tables)

Acquisitions (Tables)	3 Months Ended
	Mar. 25, 2016
Schedule of Allocation of Preliminary Purchase Price for Acquisition	The 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 Purchased (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 2015 (in thousands, except per share amounts): Three Months March 27, Net sales $ 134,964 Net income $ 1,971 Basic earnings per share $ 0.06 Diluted earnings per share $ 0.06
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 10,950 Purchased intangible assets 8,800 Total assets acquired 30,090 Bank borrowings (3,027 ) Accounts payable (3,509 ) Accrued compensation and related benefits (432 ) Other current liabilities (576 ) Deferred tax liability (1,856 ) Other liabilities (24 ) Total liabilities assumed (9,424 ) Purchase price allocated $ 20,666
Summary of Purchased Intangible Assets	Useful Purchased (In years) (In thousands) Customer relationships 7.5 $ 8,800

Goodwill and Purchased Intang22

Goodwill and Purchased Intangible Assets (Tables)	3 Months Ended
	Mar. 25, 2016
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): March 25, 2016 December 25, 2015 Goodwill Intangible Total Goodwill Intangible Total Carrying amount $ 85,248 $ 41,342 $ 126,590 $ 85,248 $ 42,782 $ 128,030
Details of Purchased Intangible Assets	Details of purchased intangible assets were as follows (in thousands): As of March 25, 2016 As of December 25, 2015 Gross Accumulated Carrying Gross Accumulated Carrying Useful AIT Customer relationships $ 19,000 $ (15,738 ) $ 3,262 $ 19,000 $ (15,298 ) $ 3,702 7 Tradename 1,900 (1,900 ) — 1,900 (1,900 ) — 6 Intellectual property/know-how 1,600 (857 ) 743 1,600 (800 ) 800 7 Marchi Customer relationships 9,900 (1,155 ) 8,745 9,900 (907 ) 8,993 10 Tradename 1,170 (274 ) 896 1,170 (217 ) 953 6 Intellectual property/know-how 12,300 (1,609 ) 10,691 12,300 (1,264 ) 11,036 8-12 Miconex Customer relationships 8,800 (782 ) 8,018 8,800 (489 ) 8,311 7.5 UCT Tradename 8,987 — 8,987 8,987 — 8,987 * Total $ 63,657 $ (22,315 ) $ 41,342 $ 63,657 $ (20,875 ) $ 42,782 * 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 March 25, 2016, future estimated amortization expense is expected to be as follows (in thousands): Amortization 2016 (remaining in year) $ 4,318 2017 4,924 2018 4,582 2019 4,210 2020 3,682 Thereafter 10,639 Total $ 32,355

Income Tax (Tables)

Income Tax (Tables)	3 Months Ended
	Mar. 25, 2016
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): Three months ended March 25, March 27, Balance as of the beginning of period $ 337 $ 356 Increase (decrease) related to current year tax 2 18 Balance as of the end of period $ 339 $ 374

Net Income Per Share (Tables)

Net Income Per Share (Tables)	3 Months Ended
	Mar. 25, 2016
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 March 25, March 27, Numerator: Net income (loss) $ (3,239 ) $ 1,173 Denominator: Shares used in computation — basic: Weighted average common shares outstanding 32,309 30,485 Shares used in computation — diluted: Shares used in computing basic net income (loss) per share 32,309 30,485 Dilutive effect of common shares outstanding subject to repurchase — 333 Dilutive effect of options outstanding — 146 Weighted average shares used in computing diluted net income (loss) per share 32,309 30,964 Net income (loss) per share — basic $ (0.10 ) $ 0.04 Net income (loss) per share — diluted $ (0.10 ) $ 0.04

Commitments and Contingencies (

Commitments and Contingencies (Tables)	3 Months Ended
	Mar. 25, 2016
Commitments and Contingencies Disclosure [Abstract]
Summary of Future Minimum Payments under Operating Leases	As of March 25, 2016, future minimum payments under these operating leases were as follows (in thousands): Fiscal Year 2016 (remaining in year) $ 5,043 2017 5,857 2018 4,525 2019 3,557 2020 3,362 Thereafter 5,361 Total minimum lease payments $ 27,705

Segment and Geographic Inform26

Segment and Geographic Information (Tables)	3 Months Ended
	Mar. 25, 2016
Segment Reporting [Abstract]
Revenue by Geographic Area	The following table sets forth revenue by geographic area (in thousands): Three months ended March 25, March 27, United States $ 65,839 $ 89,468 China 3,447 11,962 Singapore 32,684 18,233 Austria 8,502 — Other 1,757 5,655 $ 112,229 $ 125,318

Organization and Significant 27

Organization and Significant Accounting Policies - Additional Information (Detail)	3 Months Ended		12 Months Ended
	Mar. 25, 2016CustomerSegment	Mar. 27, 2015	Dec. 25, 2015Customer
Concentration Risk [Line Items]
Number of reportable segments | Segment	1
Customer Concentration Risk [Member]
Concentration Risk [Line Items]
Number of customers with accounts receivable greater than 10% | Customer	3		3
Sales [Member] | Customer Concentration Risk [Member]
Concentration Risk [Line Items]
Concentration percentage	79.70%	75.60%
Sales [Member] | International Sales [Member]
Concentration Risk [Line Items]
Concentration percentage	43.90%	31.80%
Applied Materials, Inc., Lam Research Corporation and ASM International [Member] | Accounts Receivable [Member] | Customer Concentration Risk [Member]
Concentration Risk [Line Items]
Concentration percentage	90.50%		84.60%
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
	Mar. 25, 2016	Mar. 27, 2015
Concentration Risk [Line Items]
Total	79.70%	75.60%
Lam Research Corporation [Member]
Concentration Risk [Line Items]
Total	56.60%	46.70%
Applied Materials, Inc. [Member]
Concentration Risk [Line Items]
Total	23.10%	28.90%

Organization and Significant 29

Organization and Significant Accounting Policies - Assets or Liabilities Measured at Fair Value (Detail) - USD ($) $ in Thousands	Mar. 25, 2016	Dec. 25, 2015
Interest Rate Swap [Member]
Other liabilities:
Assets or liabilities measured at fair value	$ 68	$ 23
Cash and cash equivalents:
Assets or liabilities measured at fair value	68	23
Money Market Fund Deposits [Member]
Other liabilities:
Assets or liabilities measured at fair value		640
Cash and cash equivalents:
Assets or liabilities measured at fair value		640
Contingent Earn-out Liability [Member]
Other liabilities:
Assets or liabilities measured at fair value	1,252	831
Cash and cash equivalents:
Assets or liabilities measured at fair value	1,252	831
Level 1 [Member] | Money Market Fund Deposits [Member]
Other liabilities:
Assets or liabilities measured at fair value		640
Cash and cash equivalents:
Assets or liabilities measured at fair value		640
Significant Other Observable Inputs (Level 2) [Member] | Interest Rate Swap [Member]
Other liabilities:
Assets or liabilities measured at fair value	68	23
Cash and cash equivalents:
Assets or liabilities measured at fair value	68	23
Significant Unobservable Inputs (Level 3) [Member] | Contingent Earn-out Liability [Member]
Other liabilities:
Assets or liabilities measured at fair value	1,252	831
Cash and cash equivalents:
Assets or liabilities measured at fair value	$ 1,252	$ 831

Organization and Significant 30

Organization and Significant Accounting Policies - Additional Information 1 (Detail) - USD ($)	3 Months Ended
	Mar. 25, 2016	Mar. 27, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
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
Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares vesting period, years	3 years
Vested shares withheld to satisfy withholding tax obligations	78,517
Vested shares issued net of tax withholdings	226,326
Stock-based compensation cost, net of estimated forfeitures, recognized	$ 7,100,000
Outstanding restricted stock	1,523,556
Aggregate fair value	$ 7,700,000
Weighted average remaining contractual term (in years)	2 years 1 month 28 days
Granted, stock shares	438,500
Weighted average fair value, granted	$ 5.31
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
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
Unamortized expense of company's unvested restricted stock awards	$ 100,000
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 shares	205,500
Weighted average fair value, granted	$ 5.31

Organization and Significant 31

Organization and Significant Accounting Policies - Schedule of Stock Option Activity (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 25, 2016	Dec. 25, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Outstanding, Shares, Beginning balance	315,648
Granted, Shares	0
Exercised, Shares	0
Cancelled, Shares	(2,220)
Outstanding, Shares, Ending balance	313,428	315,648
Options exercisable, Shares	313,428
Weighted Average Exercise Price, Outstanding, Beginning balance	$ 10.02
Granted, Weighted Average Exercise Price	0
Exercised, Weighted Average Exercise Price	0
Canceled, Weighted Average Exercise Price	8.96
Weighted Average Exercise Price, Outstanding, Ending balance	10.03	$ 10.02
Options exercisable, Weighted Average Exercise Price	$ 10.03
Weighted Average Remaining Contractual Life (years), Outstanding	1 year 9 months 29 days	2 years 22 days
Weighted Average Remaining Contractual Life (years), Options exercisable	1 year 9 months 29 days
Aggregate Intrinsic Value, Outstanding, Beginning balance	$ 216
Aggregate Intrinsic Value, Outstanding, Ending balance	180	$ 216
Aggregate Intrinsic Value, Options exercisable	$ 180

Organization and Significant 32

Organization and Significant Accounting Policies - Summary of Restricted Stock Unit and Restricted Stock Award Activity (Detail) - Restricted Stock Unit and Restricted Stock Award [Member] $ in Thousands	3 Months Ended
	Mar. 25, 2016USD ($)shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unvested restricted stock units and restricted stock awards, Number of Shares, Beginning balance	1,267,942
Granted, Number of Shares	644,000
Vested, Number of Shares	(304,843)
Forfeited, Number of Shares	(35,543)
Unvested restricted stock units and restricted stock awards, Number of Shares, Ending balance	1,571,556
Vested and expected to vest restricted stock units and restricted stock awards, Number of Shares	1,267,799
Unvested restricted stock units and restricted stock awards, Beginning balance, Aggregate Intrinsic Value | $	$ 6,563
Unvested restricted stock units and restricted stock awards, Ending balance, Aggregate Intrinsic Value | $	7,984
Vested and expected to vest restricted stock units and restricted stock awards, Aggregate Intrinsic Value | $	$ 6,440

Organization and Significant 33

Organization and Significant Accounting Policies - Stock-Based Compensation Expense Included in Condensed Consolidated Statements of Operations (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 25, 2016	Mar. 27, 2015
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation	$ 1,065	$ 474
Income tax benefit		(146)
Net stock-based compensation expense	1,065	328
Cost of Goods Sold [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation	276	382
Research and Development [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation	61	50
Sales and Marketing [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation	77	111
General and Administrative [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation	$ 651	$ (69)

Financial Instruments - Additio

Financial Instruments - Additional Information (Detail) - USD ($)	Mar. 25, 2016	Sep. 25, 2015	Mar. 25, 2016	Mar. 27, 2015	Dec. 25, 2015	Sep. 30, 2015	Mar. 25, 2015	Dec. 26, 2014
Financial Instruments [Line Items]
Carrying value of cash and cash equivalents	$ 45,539,000		$ 45,539,000	$ 69,607,000	$ 50,103,000			$ 78,997,000
Effective portion of cash flow hedge before tax effect	64,000,000
Cash flow hedge, expected to be reclassified from AOCI into earnings	53,700,000
New Term Loan Credit Facility [Member]
Financial Instruments [Line Items]
Outstanding amounts	35,000,000		$ 35,000,000
Miconex [Member] | Derivatives Not Designated as Hedging Instruments [Member]
Financial Instruments [Line Items]
Non-Designated Derivatives, description			Miconex interest swap to convert the variable interest rates on Miconex debt to fixed rates with a total notional amount of $0.4 million is not designated as hedging instruments. The Company recognizes gains and losses on this contract, as well any related costs in interest and other income (expense), net.
Interest Rate Swap [Member] | New Term Loan Credit Facility [Member]
Financial Instruments [Line Items]
Derivative instrument, notional amount						$ 20,000,000
Interest Rate Swap [Member] | Miconex [Member] | Derivatives Not Designated as Hedging Instruments [Member]
Financial Instruments [Line Items]
Derivative instrument, notional amount	400,000		$ 400,000
Credit Agreement [Member] | New Term Loan Credit Facility [Member]
Financial Instruments [Line Items]
Outstanding amounts	35,000,000		$ 35,000,000
Debt instrument variable interest rate			2.75%
Credit Agreement [Member] | London Interbank Offered Rate (LIBOR) [Member] | New Term Loan Credit Facility [Member]
Financial Instruments [Line Items]
Debt instrument variable interest rate		0.44%	0.44%
Credit Agreement [Member] | Interest Rate Swap [Member] | New Term Loan Credit Facility [Member]
Financial Instruments [Line Items]
Derivative instrument, notional amount	$ 18,700,000		$ 18,700,000
Debt instrument interest rate	3.74%		3.74%
Debt instrument LIBOR rate		0.99%				0.99%
Money Market Fund Deposits [Member]
Financial Instruments [Line Items]
Carrying value of cash and cash equivalents					600,000		$ 0
Money Market Fund Deposits [Member] | Level 1 [Member]
Financial Instruments [Line Items]
Fair value of cash and cash equivalents					$ 600,000		$ 0
East West and City National Bank [Member] | Interest Rate Swap [Member]
Financial Instruments [Line Items]
Derivative instrument, notional amount		$ 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
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	$ 35,000,000		$ 35,000,000
Debt instrument interest rate	3.74%		3.74%
Derivatives in Cash Flow Hedging Relationship [Member] | East West and City National Bank [Member] | Interest Rate Swap [Member] | New Term Loan Credit Facility [Member]
Financial Instruments [Line Items]
Derivative instrument, notional amount	$ 18,700,000		$ 18,700,000

Financial Instruments - Schedul

Financial Instruments - Schedule of Derivative Instruments at Gross Fair Value (Detail) - Interest Rate Swap [Member] - Significant Other Observable Inputs (Level 2) [Member] - Deferred Rent and Other Liabilities [Member] - USD ($) $ in Thousands	Mar. 25, 2016	Dec. 25, 2015
Derivatives, Fair Value [Line Items]
Derivative liabilities, Fair Value of Derivatives Designated as Hedge Instrument	$ 57	$ 23
Derivative liabilities, Fair Value of Derivatives Not Designated as Hedge Instrument	11	10
Derivative liabilities, Total Fair Value	$ 68	$ 33

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] $ in Thousands	3 Months Ended
	Mar. 25, 2016USD ($)
Derivative Instruments, Gain (Loss) [Line Items]
Gains (Losses) Recognized in OCI on Derivatives Before Tax Effect (Effective Portion)	$ (64)
Interest and Other Income (Expense), Net [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gains Reclassified from AOCI into Income (Effective Portion)	$ 27

Balance Sheet Information - Sum

Balance Sheet Information - Summary of Inventories (Detail) - USD ($) $ in Thousands	Mar. 25, 2016	Dec. 25, 2015
Inventory Disclosure [Abstract]
Raw materials	$ 62,282	$ 57,321
Work in process	21,762	17,954
Finished goods	5,163	4,561
Inventory, gross	89,207	79,836
Reserve for excess and obsolete	(7,212)	(7,120)
Total	$ 81,995	$ 72,716

Balance Sheet Information - Equ

Balance Sheet Information - Equipment and Leasehold Improvements, Net (Detail) - USD ($) $ in Thousands	Mar. 25, 2016	Dec. 25, 2015
Property, Plant and Equipment [Line Items]
Equipment and leasehold improvements, gross	$ 47,941	$ 45,881
Accumulated depreciation	(30,026)	(28,614)
Total	17,915	17,267
Computer Equipment and Software [Member]
Property, Plant and Equipment [Line Items]
Equipment and leasehold improvements, gross	10,898	10,308
Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Equipment and leasehold improvements, gross	3,187	3,201
Machinery and Equipment [Member]
Property, Plant and Equipment [Line Items]
Equipment and leasehold improvements, gross	16,424	16,253
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Equipment and leasehold improvements, gross	$ 17,432	$ 16,119

Acquisitions - Additional Infor

Acquisitions - Additional Information (Detail) - USD ($)	Jul. 31, 2015	Feb. 05, 2015	Mar. 25, 2016	Mar. 27, 2015	Dec. 25, 2015	Feb. 28, 2015
Business Acquisition [Line Items]
Fair value of common stock per share	$ 7.64
Increase in fair value of earn-out payments			$ 421,000
Goodwill amortization period			15 years
Net sales			$ 112,229,000	$ 125,318,000
Operating income			(698,000)	2,648,000
Amortization of finite lived intangibles			1,440,000	1,137,000
Miconex [Member]
Business Acquisition [Line Items]
Cash paid for acquisition	$ 15,600,000
Business acquisition, potential cash earn-out payments	$ 1,300,000		1,200,000		$ 800,000
Business acquisition, potential cash payments period	2 years
Percentage of shareholding interest acquired	100.00%
Purchase price allocated	$ 20,666,000
Stock consideration for acquisition	3,800,000
Increase in fair value of earn-out payments			$ 400,000
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
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
Total purchase price		$ 43,700,000
Acquisition costs		200,000
Amount borrowed to finance cash portion of acquisition		$ 29,700,000
Net sales				2,100,000
Operating income				700,000
Amortization of finite lived intangibles				400,000
Marchi Thermal Systems Inc [Member] | General and Administrative [Member]
Business Acquisition [Line Items]
Acquisition costs				200,000
Marchi Thermal Systems Inc and Miconex S.r.o. [Member]
Business Acquisition [Line Items]
Acquisition related costs				$ 200,000

Acquisitions - Schedule of Allo

Acquisitions - Schedule of Allocation of Preliminary Purchase Price for Acquisition (Detail) - USD ($) $ in Thousands	Mar. 25, 2016	Dec. 25, 2015	Jul. 31, 2015	Feb. 28, 2015
Business Acquisition [Line Items]
Goodwill	$ 85,248	$ 85,248
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			10,950
Purchased intangible assets			8,800
Total assets acquired			30,090
Bank borrowings			(3,027)
Accounts payable			(3,509)
Accrued compensation and related benefits			(432)
Other current liabilities			(576)
Deferred tax liability			(1,856)
Other liabilities			(24)
Total liabilities assumed			(9,424)
Purchase price allocated			$ 20,666
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. 25, 2015	Mar. 25, 2016
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	$ 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	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	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	$ 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 Pro fo

Acquisitions - Unaudited Pro forma Consolidated Results of Operations (Detail) - Marchi Thermal Systems Inc and Miconex S.r.o. [Member] $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 27, 2015USD ($)$ / shares
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Net sales | $	$ 134,964
Net income | $	$ 1,971
Basic earnings per share | $ / shares	$ 0.06
Diluted earnings per share | $ / shares	$ 0.06

Goodwill and Purchased Intang43

Goodwill and Purchased Intangible Assets - Goodwill and Other Indefinite Lived Intangible Assets (Detail) - USD ($) $ in Thousands	Mar. 25, 2016	Dec. 25, 2015
Intangible Assets, Net (Including Goodwill) [Abstract]
Goodwill	$ 85,248	$ 85,248
Intangible Assets	41,342	42,782
Total	$ 126,590	$ 128,030

Goodwill and Purchased Intang44

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. 25, 2015	Mar. 25, 2016
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount			$ 63,657	$ 63,657
Accumulated Amortization			(20,875)	(22,315)
Carrying Value			42,782	41,342
American Integration Technologies LLC [Member] | Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount			19,000	19,000
Accumulated Amortization			(15,298)	(15,738)
Carrying Value			$ 3,702	3,262
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			$ (1,900)	(1,900)
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			(800)	(857)
Carrying Value			$ 800	743
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	9,900
Accumulated Amortization			(907)	(1,155)
Carrying Value			$ 8,993	8,745
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	1,170
Accumulated Amortization			(217)	(274)
Carrying Value			$ 953	896
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	12,300
Accumulated Amortization			(1,264)	(1,609)
Carrying Value			$ 11,036	10,691
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	8,800
Accumulated Amortization			(489)	(782)
Carrying Value			$ 8,311	8,018
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 Intang45

Goodwill and Purchased Intangible Assets - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 25, 2016	Mar. 27, 2015	Dec. 25, 2015
Finite-Lived Intangible Assets [Line Items]
Amortization of finite lived intangibles	$ 1,440	$ 1,137
Marchi Thermal Systems Inc [Member]
Finite-Lived Intangible Assets [Line Items]
Amortization of finite lived intangibles		$ 400
Customer Relationships [Member] | American Integration Technologies LLC [Member] | Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated economic lives for intangible assets			6 years
Customer Relationships [Member] | American Integration Technologies LLC [Member] | Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated economic lives for intangible assets			7 years
Customer Relationships [Member] | Miconex [Member] | Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated economic lives for intangible assets			7 years
Customer Relationships [Member] | Miconex [Member] | Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated economic lives for intangible assets			12 years
Customer Relationships [Member] | Marchi Thermal Systems Inc [Member] | Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated economic lives for intangible assets			7 years
Customer Relationships [Member] | Marchi Thermal Systems Inc [Member] | Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated economic lives for intangible assets			12 years
Trade Name [Member] | American Integration Technologies LLC [Member] | Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated economic lives for intangible assets			6 years
Trade Name [Member] | American Integration Technologies LLC [Member] | Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated economic lives for intangible assets			7 years
Trade Name [Member] | Marchi Thermal Systems Inc [Member] | Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated economic lives for intangible assets			6 years
Trade Name [Member] | Marchi Thermal Systems Inc [Member] | Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated economic lives for intangible assets			7 years
Intellectual Properties/Know-How [Member] | Miconex [Member] | Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated economic lives for intangible assets			7 years
Intellectual Properties/Know-How [Member] | Miconex [Member] | Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated economic lives for intangible assets			12 years
Intellectual Properties/Know-How [Member] | Marchi Thermal Systems Inc [Member] | Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated economic lives for intangible assets			7 years
Intellectual Properties/Know-How [Member] | Marchi Thermal Systems Inc [Member] | Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated economic lives for intangible assets			12 years

Goodwill and Purchased Intang46

Goodwill and Purchased Intangible Assets - Future Estimated Amortization Expense (Detail) $ in Thousands	Mar. 25, 2016USD ($)
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
2016 (remaining in year)	$ 4,318
2,017	4,924
2,018	4,582
2,019	4,210
2,020	3,682
Thereafter	10,639
Total	$ 32,355

Borrowing Arrangements - Additi

Borrowing Arrangements - Additional Information (Detail) - USD ($)	1 Months Ended		3 Months Ended
	Sep. 25, 2015	Jan. 31, 2015	Mar. 25, 2016	Mar. 27, 2015	Dec. 25, 2015	Sep. 30, 2015	Feb. 05, 2015	Feb. 04, 2015	Feb. 02, 2015
Debt Instrument [Line Items]
Unamortized debt issuance costs				$ 700,000
Amortization of debt discount			$ 600,000
Debt Instrument, covenant description			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 3.50 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. In December 2015, the Credit Agreement was amended to add a covenant requiring the Company to maintain a cash balance of $35.0 million at the end of each quarter. The Company was in compliance with all covenants for the quarter ended March 25, 2016.
Required cash balance					$ 35,000,000
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				1.25%
New term loan principal amount outstanding condition two			$ 10,000,000
Maximum [Member]
Debt Instrument [Line Items]
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
First Quarter [Member] | Maximum [Member]
Debt Instrument [Line Items]
Consolidated leverage ratio for first quarter of next fiscal year				3.50%
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 Credit Facility [Member]
Debt Instrument [Line Items]
Maturity date of debt			Feb. 2, 2019
Base rate interest			3.19%
Outstanding amount of borrowing under credit facility									40,000,000
Outstanding amounts			$ 35,000,000
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 Term Loan and New Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Unamortized debt issuance costs			400,000
Total debt balance			$ 70,800,000
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
Maturity date of debt			Jul. 3, 2016
Base rate interest		3.75%
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
Maturity date of debt			Jul. 3, 2016
Credit Agreement [Member] | New Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Borrowing capacity under credit facility									40,000,000
Debt instrument interest rate			3.50%
Credit Agreement [Member] | New Term Loan Credit Facility [Member]
Debt Instrument [Line Items]
Borrowing capacity under credit facility									40,000,000
Debt instrument variable interest rate			2.75%
Outstanding amounts			$ 35,000,000
Credit Agreement [Member] | New Term Loan Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Debt instrument variable interest rate	0.44%		0.44%
Credit Agreement [Member] | New Term Loan Credit Facility [Member] | Interest Rate Swap [Member]
Debt Instrument [Line Items]
Debt instrument interest rate			3.74%
Derivative instrument, notional amount			$ 18,700,000
Debt instrument LIBOR rate	0.99%					0.99%
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
Base Rate Loans [Member]
Debt Instrument [Line Items]
Debt instrument interest rate			3.25%
Bank Debt [Member] | New Term Loan and New Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Total debt balance			$ 73,700,000
Bank Debt [Member] | New Term Loan and New Revolving Credit Facility [Member] | Czech Republic [Member]
Debt Instrument [Line Items]
Debt instrument interest rate			1.30%
Total debt balance			$ 2,900,000
Debt due date, start year			2,016
Debt due date, end year			2,020

Income Tax - Additional Informa

Income Tax - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 25, 2016	Mar. 27, 2015	Dec. 25, 2015	Dec. 26, 2014
Income Tax Disclosure [Abstract]
Income tax provision	$ 1,450	$ 519
Effective tax rate	(80.80%)	30.70%
Undistributed earnings of foreign subsidiaries	$ 71,400
Gross liability for unrecognized tax benefits	$ 339	$ 374	$ 337	$ 356

Income Tax - Activity Related t

Income Tax - Activity Related to Company's Unrecognized Tax Benefits (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 25, 2016	Mar. 27, 2015
Income Tax Disclosure [Abstract]
Balance as of the beginning of period	$ 337	$ 356
Increase (decrease) related to current year tax	2	18
Balance as of the end of period	$ 339	$ 374

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
	Mar. 25, 2016	Mar. 27, 2015
Numerator:
Net income (loss)	$ (3,239)	$ 1,173
Shares used in computation - basic:
Weighted average common shares outstanding	32,309	30,485
Shares used in computation - diluted:
Shares used in computing basic net income (loss) per share	32,309	30,485
Dilutive effect of common shares outstanding subject to repurchase		333
Dilutive effect of options outstanding		146
Weighted average shares used in computing diluted net income (loss) per share	32,309	30,964
Net income (loss) per share - basic	$ (0.10)	$ 0.04
Net income (loss) per share - diluted	$ (0.10)	$ 0.04

Net Income Per Share - Addition

Net Income Per Share - Additional Information (Detail) - shares	3 Months Ended
	Mar. 25, 2016	Mar. 27, 2015
Employee Stock Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share	196,286	277,648

Commitments and Contingencies -

Commitments and Contingencies - Additional Information (Detail) $ in Millions	3 Months Ended
	Mar. 25, 2016USD ($)
Long-term Purchase Commitment [Line Items]
Operating lease expiration period	Various dates through 2022
Inventory [Member]
Long-term Purchase Commitment [Line Items]
Purchase commitments	$ 44.1

Commitments and Contingencies53

Commitments and Contingencies - Summary of Future Minimum Payments under Operating Leases (Detail) $ in Thousands	Mar. 25, 2016USD ($)
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
2016 (remaining in year)	$ 5,043
2,017	5,857
2,018	4,525
2,019	3,557
2,020	3,362
Thereafter	5,361
Total minimum lease payments	$ 27,705

Segment and Geographic Inform54

Segment and Geographic Information - Revenue by Geographic Area (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 25, 2016	Mar. 27, 2015
Segment Reporting Information [Line Items]
Sales	$ 112,229	$ 125,318
United States [Member]
Segment Reporting Information [Line Items]
Sales	65,839	89,468
China [Member]
Segment Reporting Information [Line Items]
Sales	3,447	11,962
Singapore [Member]
Segment Reporting Information [Line Items]
Sales	32,684	18,233
Austria [Member]
Segment Reporting Information [Line Items]
Sales	8,502
Other [Member]
Segment Reporting Information [Line Items]
Sales	$ 1,757	$ 5,655

Segment and Geographic Inform55

Segment and Geographic Information - Additional Information (Detail) - USD ($) $ in Millions	Mar. 25, 2016	Mar. 27, 2015
Other Asia [Member]
Segment Reporting Information [Line Items]
Net long-lived assets	$ 8.5	$ 8.5
Czech Republic [Member]
Segment Reporting Information [Line Items]
Net long-lived assets	$ 1.8