Onto Innovation (ONTO) 10-Q 5 May 20 2020 Q1 Quarterly report Financial data

Document and Entity Information

Document and Entity Information Document - shares	3 Months Ended
	Mar. 28, 2020	Apr. 19, 2020
Cover [Abstract]
Entity Registrant Name	ONTO INNOVATION INC.
Trading Symbol	ONTO
Entity Central Index Key	0000704532
Current Fiscal Year End Date	--12-28
Entity Filer Category	Large Accelerated Filer
Document Type	10-Q
Document Period End Date	Mar. 28, 2020
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q1
Document Quarterly Report	true
Document Transition Report	false
Entity Interactive Data Current	Yes
Amendment Flag	false
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Current Reporting Status	Yes
Entity Shell Company	false
Title of 12(b) Security	Common Stock, $0.001 par value per share
Security Exchange Name	NYSE
Entity Common Stock, Shares Outstanding		48,552,370
Entity File Number	001-39110
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	94-2276314
Entity Address, Address Line One	16 Jonspin Road
Entity Address, City or Town	Wilmington
Entity Address, State or Province	MA
Entity Address, Postal Zip Code	01887
City Area Code	978
Local Phone Number	253-6200

CONDENSED CONSOLIDATED STATEMEN

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 28, 2020	Mar. 31, 2019
Income Statement [Abstract]
Revenue	$ 139,928	$ 60,892
Cost of revenue	77,297	28,873
Gross profit	62,631	32,019
Operating expenses:
Research and development	20,927	10,540
Sales and marketing	13,071	4,726
General and administrative	20,147	8,758
Amortization	13,732	387
Total operating expenses	67,877	24,411
Operating (loss) income	(5,246)	7,608
Interest income, net	1,210	806
Other income, net	32	381
(Loss) income before provision for income taxes	(4,004)	8,795
Provision for income taxes	400	1,219
Net (loss) income	$ (4,404)	$ 7,576
(Loss) earnings per share:
Basic	$ (0.09)	$ 0.30
Diluted	$ (0.09)	$ 0.30
Weighted average shares outstanding:
Basic	50,121	24,863
Diluted	50,121	25,144

Condensed Consolidated Statem_2

Condensed Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 28, 2020	Mar. 31, 2019
Statement Of Income And Comprehensive Income [Abstract]
Net (loss) income	$ (4,404)	$ 7,576
Other comprehensive (loss), net of tax:
Change in net unrealized (losses) gains on available-for-sale marketable securities	(526)	95
Change in currency translation adjustments	(2,231)	(518)
Other comprehensive (loss)	(2,757)	(423)
Total comprehensive (loss) income	$ (7,161)	$ 7,153

CONDENSED CONSOLIDATED BALANCE

CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 28, 2020	Dec. 31, 2019
Current Assets:
Cash and cash equivalents	$ 101,320	$ 130,673
Marketable securities	190,629	189,563
Accounts receivable, less allowance of $1,398 and $1,247	149,229	123,656
Inventories, net	160,543	176,134
Prepaid expenses and other current assets	26,798	21,638
Total current assets	628,519	641,664
Property, plant and equipment, net	96,973	98,420
Goodwill	307,626	307,148
Identifiable intangible assets, net	358,222	371,953
Deferred income taxes	1,397	1,456
Other assets	23,650	27,939
Total assets	1,416,387	1,448,580
Current liabilities:
Accounts payable	32,205	27,738
Accrued liabilities	29,395	26,204
Deferred revenue	15,570	12,629
Other current liabilities	17,158	19,172
Total current liabilities	94,328	85,743
Deferred and other tax liabilities	66,263	67,040
Other non-current liabilities	29,991	31,771
Total liabilities	190,582	184,554
Commitments and contingencies
Stockholders’ equity:
Common stock	49	50
Additional paid-in capital	1,238,378	1,269,437
Accumulated other comprehensive loss	(3,355)	(598)
Accumulated deficit	(9,267)	(4,863)
Total stockholders’ equity	1,225,805	1,264,026
Total liabilities and stockholders’ equity	$ 1,416,387	$ 1,448,580

CONDENSED CONSOLIDATED BALANC_2

CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Mar. 28, 2020	Dec. 31, 2019
Statement Of Financial Position [Abstract]
Allowances for doubtful accounts	$ 1,398	$ 1,247

CONDENSED CONSOLIDATED STATEM_3

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 28, 2020	Mar. 31, 2019
Cash flows from operating activities:
Net (loss) income	$ (4,404)	$ 7,576
Adjustments to reconcile net income to net cash and cash equivalents provided by (used in) operating activities:
Amortization of intangibles	13,732	387
Depreciation	3,103	1,254
Share-based compensation	3,955	2,163
Acquired inventory step-up amortization	9,898
Provision for doubtful accounts and inventory valuation	928	1,028
Other, net	(144)	(381)
Changes in operating assets and liabilities	(18,170)	(13,593)
Net cash and cash equivalents provided by (used in) operating activities	8,898	(1,566)
Cash flows from investing activities:
Purchases of marketable securities	(76,460)	(22,142)
Proceeds from sales of marketable securities	74,857	14,295
Purchases of property, plant and equipment	(997)	(1,320)
Net cash and cash equivalents used in investing activities	(2,600)	(9,167)
Cash flows from financing activities:
Purchase of common stock	(33,614)	(744)
Tax payments related to shares withheld for share-based compensation plans	(1,565)	(598)
Issuance of shares through share-based compensation plans	164
Net cash and cash equivalents used in financing activities	(35,015)	(1,342)
Effect of exchange rate changes on cash and cash equivalents	(636)	(145)
Net decrease in cash and cash equivalents	(29,353)	(12,220)
Cash and cash equivalents at beginning of period	130,673	112,388
Cash and cash equivalents at end of period	101,320	100,168
Supplemental disclosure of cash flow information:
Income taxes paid	$ 588	$ 114

Consolidated Statements of Stoc

Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Other Comprehensive Loss [Member]	Retained Earnings (Accumulated Deficit) [Member]
Balance at Dec. 31, 2018	$ 361,888	$ 31	$ 369,893	$ (1,263)	$ (6,773)
Balance, Shares at Dec. 31, 2018		24,855
Issuance of shares through share-based compensation plans, net, Shares		83
Repurchase of common stock	(744)		(744)
Repurchase of common stock, Shares		(30)
Net (loss) income	7,576				7,576
Share-based compensation	2,163		2,163
Share-based compensation plan withholdings	(598)		(598)
Share-based compensation plan withholdings, Shares		(22)
Currency translation	(518)			(518)
Unrealized gain (loss) on investments	95			95
Balance at Mar. 31, 2019	369,862	$ 31	370,714	(1,686)	803
Balance, shares at Mar. 31, 2019		24,886
Balance at Dec. 31, 2019	1,264,026	$ 50	1,269,437	(598)	(4,863)
Balance, Shares at Dec. 31, 2019		50,184
Issuance of shares through share-based compensation plans, net	164		164
Issuance of shares through share-based compensation plans, net, Shares		240
Repurchase of common stock	(33,614)	$ (1)	(33,613)
Repurchase of common stock, Shares		(1,250)
Net (loss) income	(4,404)				(4,404)
Share-based compensation	3,955		3,955
Share-based compensation plan withholdings	(1,565)		(1,565)
Share-based compensation plan withholdings, Shares		(42)
Currency translation	(2,231)			(2,231)
Unrealized gain (loss) on investments	(526)			(526)
Balance at Mar. 28, 2020	$ 1,225,805	$ 49	$ 1,238,378	$ (3,355)	$ (9,267)
Balance, shares at Mar. 28, 2020		49,132

Basis of Presentation

Basis of Presentation	3 Months Ended
	Mar. 28, 2020
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Basis of Presentation	NOTE 1. Basis of Presentation The accompanying interim unaudited Condensed Consolidated Financial Statements have been prepared by Onto Innovations Inc. (the “Company” or “Onto”) and in the opinion of management reflect all adjustments, consisting of normal recurring accruals, necessary for their fair presentation in accordance with accounting principles generally accepted in the United States of America (“U.S. GAAP”). Preparing financial statements requires management to make estimates and assumptions that affect amounts reported in the financial statements and accompanying notes. Actual amounts could differ materially from reported amounts. The interim results for the three months ended March 28, 2020 are not necessarily indicative of results to be expected for the entire year or any future periods. This interim financial information should be read in conjunction with the financial statements and the notes thereto included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2019 (“2019 Form 10-K”) filed with the Securities and Exchange Commission (“SEC”) on February 25, 2020. The accompanying Condensed Consolidated Balance Sheet at December 31, 2019 has been derived from the audited consolidated financial statements included in the 2019 Form 10-K. As further discussed in Note 2 of Notes to the Condensed Consolidated Financial Statements, Rudolph Technologies, Inc. (“Rudolph”) and Nanometrics Incorporated (“Nanometrics”) completed a merger effective October 25, 2019 (the “Merger”). Upon consummation of the Merger, the combined company was renamed Onto Innovation. The Merger was accounted for as a reverse acquisition where Rudolph was the accounting acquirer and Nanometrics was the legal acquirer in accordance with Accounting Standards Codification (“ASC”) Topic 805, “Business Combinations” (“ASC 805”). Accordingly, Rudolph’s historical results of operations replaced the Nanometrics historical results of operations for all periods prior to the merger. Specifically, the accompanying Condensed Consolidated Financial Statements for all periods prior to the Merger are those of Rudolph and for the period after the Merger, also include Nanometrics. The Condensed Consolidated Financial Statements reflect the assets and liabilities of Rudolph at historical cost basis and the assets and liabilities of Nanometrics are reflected at fair value under the acquisition method. While Rudolph applied the acquisition method of accounting to Nanometrics, the legal capital in the current and prior periods has been retroactively adjusted to reflect the legal capital of Nanometrics. Accordingly, earnings per share has been retroactively restated for periods prior to the merger date. On February 28, 2020, the Board of Directors of Onto Innovation Inc. (the “Company”) determined it is in the best interests of the Company to change its fiscal year end from December 31 to a 52-53 week fiscal year ending on the Saturday closest to December 31. The change is intended to align the Company’s fiscal periods more closely with industry peers and improve comparability. The Company made the fiscal year change on a prospective basis and has not adjusted operating results for prior periods. The change affects the prior year comparability of the Company’s fiscal quarters in 2020 and will result in shifts in the quarterly periods, which will not have a material impact on quarterly financial results. The first fiscal quarter of 2020 began on January 1, 2020 and ended March 28, 2020 and is referred to throughout this report as the “three months ended March 28, 2020” or the “first quarter of 2020.” The registrant’s current fiscal year will end on December 26, 2020. Reclassifications . In conjunction with the Merger, the Company assessed the need to realign its financial statement presentation and certain income statement classifications were adjusted with prior periods reclassified to conform with current period presentation. The changes made were as follows: • Amounts related to sales and marketing are now presented on a separate line on the Condensed Consolidated Statements of Operations and were previously reported under the caption “Selling, general and administrative.” • Amounts related to applications engineering are now presented under the caption, “Sales and marketing” on the Condensed Consolidated Statements of Operations and were previously reported under the caption “Research and development.” Impact of COVID-19 on our Business The impact of the COVID-19 pandemic continues to unfold. The extent of the pandemic’s effect on the Company’s operational and financial performance will depend in large part on future developments, which cannot be predicted with confidence at this time. Future developments include the duration, scope and severity of the pandemic, the actions taken to contain or mitigate its impact, the impact on governmental programs and budgets, the development of treatments or vaccines, and the resumption of widespread economic activity. Due to the inherent uncertainty of the unprecedented and rapidly evolving situation, the Company is unable to predict with any confidence the likely impact of the COVID-19 pandemic on its future operations. Recent Accounting Pronouncements Recently Adopted Effective January 1, 2020, the Company adopted Accounting Standards Update (“ASU”) No. 2018-13, “Fair Value Measurement (Topic 820): Disclosure Framework – Changes to the Disclosure Requirements for Fair Value Measurement.” This ASU is part of the Financial Account Standard Board’s (“FASB”) larger disclosure framework project intended to improve the effectiveness of financial statement footnote disclosure. ASU No. 2018-13 modifies required fair value disclosures related primarily to Level 3 investments. This ASU is effective for annual periods beginning after December 15, 2019 and interim periods within those annual periods. The adoption of ASU No. 2018-13 did not have a material impact on the Company’s consolidated financial position, results of operations, and cash flows. Effective January 1, 2020, the Company adopted ASU No. 2017-09, “Compensation - Stock Compensation (Topic 718): Scope of Modification Accounting.” This ASU amends the scope of modification accounting for share-based payment arrangements and provides guidance on the types of changes to the terms or conditions of share-based payment awards to which an entity would be required to apply modification accounting under Accounting Standards Codification (“ASC”) 718. The ASU is effective for the fiscal years beginning after December 15, 2019 and for interim periods within those fiscal years. The adoption of ASU No. 2017-09 did not have a material impact on the Company’s consolidated financial position, results of operations, and cash flows. Effective January 1, 2020, the Company adopted ASU No. 2016-13, “Financial Instruments – Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments,” which represents a credit loss standard that changes the impairment model for most financial assets and certain other financial instruments. Specifically, this guidance requires entities to utilize a new “expected loss” model as it relates to trade receivables, notes and other commitments to extend credit held by a reporting entity Recently Issued In December 2019, the FASB issued ASU No. 2019-12, “Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes.” This standard simplifies the accounting for income taxes by eliminating certain exceptions to the guidance in Topic 740 related to the approach for intraperiod tax allocation, the methodology for calculating income taxes in an interim period and the recognition of deferred tax liabilities for outside basis differences. The new guidance also simplifies aspects of the accounting for franchise Recently issued accounting guidance not discussed above is not applicable or is not expected to have a material impact to the Company’s consolidated financial position, results of operations, and cash flows.

Business Combination

Business Combination	3 Months Ended
	Mar. 28, 2020
Business Combinations [Abstract]
Business Combination	NOTE 2. Business Combination Rudolph and Nanometrics completed the Merger effective October 25, 2019. The Company accounted for the Merger as a reverse acquisition, using the acquisition method of accounting in accordance with generally accepted accounting principles, with Rudolph being treated as the accounting acquiring entity. The acquired assets and liabilities of Nanometrics were recorded at their respective fair values including an amount for goodwill, which represents the purchase price paid in excess of the fair value of the net tangible and intangible assets acquired and liabilities assumed, and is attributable primarily to expected synergies, economies of scale and the assembled workforce of Nanometrics. The following table summarizes the preliminary allocation of the total purchase consideration to the initial estimated fair values of the assets acquired and liabilities assumed as of October 25, 2019, as well as adjustments aggregating $478 to other non-current liabilities during the three months ended March 28, 2020: Cash and cash equivalents $ 43,882 Marketable securities 94,389 Account receivables 49,917 Inventories 98,478 Prepaid expenses and other current assets 7,734 Property, plant and equipment 77,451 Operating lease right-of-use assets 9,658 Identifiable intangible assets 374,900 Deferred income taxes 1,352 Other assets 850 Total assets acquired 758,611 Accounts payable (23,361 ) Payroll and related expenses (20,290 ) Deferred revenue (5,931 ) Other current liabilities (10,739 ) Income taxes payable (2,699 ) Other non-current liabilities (90,591 ) Net assets acquired 605,000 Goodwill 285,131 Total purchase consideration $ 890,131

Fair Value Measurements

Fair Value Measurements	3 Months Ended
	Mar. 28, 2020
Fair Value Disclosures [Abstract]
Fair Value Measurements	NOTE 3. Fair Value Measurements The Company applies a three-level valuation hierarchy for fair value measurements. This hierarchy prioritizes the inputs into three broad levels. Level 1 inputs are quoted prices (unadjusted) in active markets for identical assets or liabilities. Level 2 inputs are quoted prices for similar assets and liabilities in active markets or inputs that are observable for the asset or liability, either directly or indirectly through market corroboration, for substantially the full term of the asset or liability. Level 3 inputs are unobservable inputs based on management’s assumptions used to measure assets and liabilities at fair value. A financial asset’s or liability’s fair value measurement classification within the hierarchy is determined based on the lowest level input that is significant to the fair value measurement. The following tables provide the assets and liabilities carried at fair value measured on a recurring basis at March 28, 2020 and December 31, 2019: Fair Value Measurements Using Carrying Value Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) March 28, 2020 Assets: Available-for-sale debt securities: Municipal notes and bonds $ 70,785 $ — $ 70,785 $ — Asset-backed securities 12,159 — 12,159 — Certificates of deposit 32,905 — 32,905 — Commercial paper 42,446 — 42,446 — Corporate bonds 32,334 — 32,334 — Foreign currency forward contracts 283 — 283 — Total assets $ 190,912 $ — $ 190,912 $ — Liabilities: Contingent consideration - acquisitions $ 569 $ — $ — $ 569 Total liabilities $ 569 $ — $ — $ 569 December 31, 2019 Assets: Available-for-sale debt securities: Municipal notes and bonds $ 81,108 $ — $ 81,108 $ — Asset-backed securities 10,779 — 10,779 — Certificates of deposit 30,507 — 30,507 — Commercial paper 30,708 — 30,708 — Corporate bonds 36,461 — 36,461 — Foreign currency forward contracts 120 — 120 — Total assets $ 189,683 $ — $ 189,683 $ — Liabilities: Contingent consideration - acquisitions $ 569 $ — $ — $ 569 Total liabilities $ 569 $ — $ — $ 569 The Company’s available-for-sale debt securities classified as Level 2 are valued using observable inputs to quoted market prices, benchmark yields, reported trades, broker/dealer quotes or alternative pricing sources with reasonable levels of price transparency. The foreign currency forward contracts are primarily measured based on the foreign currency spot and forward rates quoted by the banks or foreign currency dealers. Investment prices are obtained from third party pricing providers, which model prices utilizing the above observable inputs, for each asset class. Level 3 liabilities consisted of contingent consideration related to an acquisition for which the Company uses a discounted cash flow model to value these liabilities. The Level 3 assumptions used in the discounted cash flow model for the contingent consideration included projected revenue, timing of cash flows and estimates of discount rates of 0.0% and 9.2% for the three months ended March 28, 2020 and March 31, 2019, respectively. A significant decrease in the projected revenue or increase in discount rates could result in a significantly lower fair value measurement for the contingent consideration. This table presents a reconciliation of all liabilities measured at fair value on a recurring basis using significant unobservable inputs (Level 3) for the three months ended March 28, 2020: Fair Value Measurements Using Significant Unobservable Inputs (Level 3) Balance at December 31, 2019 $ 569 Additions — Payments — Transfer into (out of) Level 3 — Balance at March 28, 2020 $ 569 See Note 4 for additional discussion regarding the fair value of the Company’s marketable securities. Fair Value of Other Financial Instruments The carrying value of cash and cash equivalents, accounts receivable, accounts payable and accrued liabilities approximates fair value because of the short-term maturity of these instruments. The estimated fair value of these obligations is based, primarily, on a market approach, comparing the Company’s interest rates to those rates the Company believes it would reasonably receive upon re-entry into the market. Judgment is required to estimate the fair value using available market information and appropriate valuation methods.

Marketable Securities

Marketable Securities	3 Months Ended
	Mar. 28, 2020
Marketable Securities [Abstract]
Marketable Securities	NOTE 4. Marketable Securities The Company has evaluated its investment policies and determined that all of its marketable securities, which are comprised of debt securities, are to be classified as available-for-sale. The Company’s available-for-sale debt securities are carried at fair value, with the unrealized gains and losses reported in Stockholders’ equity under the caption “Accumulated other comprehensive loss.” Realized gains and losses on available-for-sale securities are included in “Other income, net” on the Condensed Consolidated Statements of Operations. The Company records other-than-temporary impairment charges for its available-for-sale debt securities when it intends to sell the securities, it is more-likely-than not that it will be required to sell the securities before a recovery, or when it does not expect to recover the entire amortized cost basis of the securities. The cost of securities sold is based on the specific identification method. The Company has determined that the gross unrealized losses on its marketable securities at March 28, 2020 and December 31, 2019 are temporary in nature. The Company reviews its investment portfolio to identify and evaluate marketable securities that have indications of possible impairment. Factors considered in determining whether a loss is other-than-temporary include the length of time and extent to which fair value has been less than the cost basis, credit quality and the Company’s ability and intent to hold the securities for a period of time sufficient to allow for any anticipated recovery in market value. At March 28, 2020 and December 31, 2019, marketable securities are categorized as follows: Amortized Cost Gross Unrealized Holding Gains Gross Unrealized Holding Losses Fair Value March 28, 2020 Municipal notes and bonds $ 70,499 $ 296 $ 10 $ 70,785 Asset-backed securities 12,216 2 59 12,159 Certificates of deposit 33,154 13 262 32,905 Commercial paper 42,511 1 66 42,446 Corporate bonds 32,507 6 179 32,334 Total marketable securities $ 190,887 $ 318 $ 576 $ 190,629 December 31, 2019 Municipal notes and bonds $ 80,926 $ 188 $ 6 $ 81,108 Asset-backed securities 10,767 12 — 10,779 Certificates of deposit 30,500 7 — 30,507 Commercial paper 30,707 1 — 30,708 Corporate bonds 36,409 52 — 36,461 Total marketable securities $ 189,309 $ 260 $ 6 $ 189,563 The amortized cost and estimated fair value of marketable securities classified by the maturity date listed on the security, regardless of the Condensed Consolidated Balance Sheets classification, is as follows at March 28, 2020 and December 31, 2019: March 28, 2020 December 31, 2019 Amortized Cost Fair Value Amortized Cost Fair Value Due within one year $ 155,514 $ 155,462 $ 152,649 $ 152,852 Due after one through five years 35,373 35,167 36,660 36,711 Due after five through ten years — — — — Due after ten years — — — — Total marketable securities $ 190,887 $ 190,629 $ 189,309 $ 189,563 The following table summarizes the estimated fair value and gross unrealized holding losses of marketable securities, aggregated by investment instrument and period of time in an unrealized loss position, at March 28, 2020 and December 31, 2019: In Unrealized Loss Position For Less Than 12 Months In Unrealized Loss Position For Greater Than 12 Months Fair Value Gross Unrealized Losses Fair Value Gross Unrealized Losses March 28, 2020 Municipal notes and bonds $ 5,086 $ 10 $ — $ — Asset-backed securities 10,978 59 — — Certificates of deposit 23,841 262 — — Commercial paper 22,457 66 — — Corporate bonds 25,458 179 — — Total $ 87,820 $ 576 $ — $ — December 31, 2019 Municipal notes and bonds $ 14,166 $ 6 $ — $ — Total $ 14,166 $ 6 $ — $ — See Note 3 for additional discussion regarding the fair value of the Company’s marketable securities.

Derivative Instruments and Hedg

Derivative Instruments and Hedging Activities	3 Months Ended
	Mar. 28, 2020
Derivative Instruments And Hedging Activities Disclosure [Abstract]
Derivative Instruments and Hedging Activities	NOTE 5. Derivative Instruments and Hedging Activities The Company, when it considers it to be appropriate, enters into forward contracts to hedge the economic exposures arising from foreign currency denominated transactions. At March 28, 2020 and December 31, 2019, these contracts included the future sale of Japanese Yen, Korean Won, Taiwanese dollar and Chinese Yuan Renminbi to purchase U.S. dollars. Foreign currency forward contracts are not designated as hedges for accounting purposes and therefore, the change in fair value is recorded in general and administrative expenses in the Condensed Consolidated Statements of Operations. The Company records its forward contracts at fair value in either prepaid expenses and other current assets or other current liabilities in the Condensed Consolidated Balance Sheets. The dollar equivalent of the U.S. dollar forward contracts and related fair values as of March 28, 2020 and December 31, 2019 were as follows: March 28, 2020 December 31, 2019 Notional amount $ 29,031 $ 38,887 Fair value of asset $ 283 $ 120

Purchased Intangible Assets

Purchased Intangible Assets	3 Months Ended
	Mar. 28, 2020
Goodwill And Intangible Assets Disclosure [Abstract]
Purchased Intangible Assets	NOTE 6. Purchased Intangible Assets Goodwill The changes in the carrying amount of goodwill are as follows: Balance at December 31, 2019 $ 307,148 Goodwill adjustments (Note 2) 478 Balance at March 28, 2020 $ 307,626 Purchased intangible assets as of March 28, 2020 and December 31, 2019 are as follows: Gross Carrying Amount Accumulated Amortization Net March 28, 2020 Finite-lived intangibles: Developed technology $ 326,726 $ 78,636 $ 248,090 Customer and distributor relationships 69,261 13,739 55,522 Trademarks and trade names 12,461 4,451 8,010 Total finite-lived intangible assets 408,448 96,826 311,622 In-process research and development 46,600 — 46,600 Total identifiable intangible assets $ 455,048 $ 96,826 $ 358,222 December 31, 2019 Finite-lived intangibles: Developed technology $ 326,726 $ 67,861 $ 258,865 Customer and distributor relationships 69,261 11,078 58,183 Trademarks and trade names 12,461 4,156 8,305 Total finite-lived intangible assets 408,448 83,095 325,353 In-process research and development 46,600 — 46,600 Total identifiable intangible assets $ 455,048 $ 83,095 $ 371,953 Intangible assets amortization expenses for the three months ended March 28, 2020 and March 31, 2019 were $13,732 and $387, respectively. Assuming no change in the gross carrying value of identifiable intangible assets and estimated lives, estimated amortization expenses for the remainder of fiscal 2020 are $40,009, and for each of the next five fiscal years estimated amortization expenses are $48,009 for 2021, $47,610 for 2022, $47,135 for 2023, $41,450 for 2024, and $24,900 for 2025.

Convertible Notes Receivable

Convertible Notes Receivable	3 Months Ended
	Mar. 28, 2020
Receivables [Abstract]
Convertible Notes Receivable	NOTE 7. Convertible Notes Receivable On May 31, 2018, the Company entered into a convertible note agreement with Simax Precision Technologies Limited (“the borrower”), which allowed them to borrow up to $15,000 in multiple promissory notes with an interest rate of 4.25% per annum payable on a semi-annual basis. The Company expected to be a supplier of lithography modules to Simax, which is used in the manufacture, sale and service of lithography systems. During the first quarter of 2020, the Company and the borrower entered into a settlement agreement to end their relationship as it pertains to this convertible note agreement. At the time of the settlement, the Company had $5,000 in outstanding convertible notes receivable with the borrower and the settlement amount of $2,848 was agreed to by both parties. Therefore, the Company increased its reserve against the convertible notes receivable to $2,152 as of March 28, 2020. The settlement was subsequently paid in April 2020.

Balance Sheet Details

Balance Sheet Details	3 Months Ended
	Mar. 28, 2020
Balance Sheet Detail [Abstract]
Balance Sheet Details	NOTE 8. Balance Sheet Details Inventories Inventories, net are comprised of the following: March 28, 2020 December 31, 2019 Materials $ 110,392 $ 108,492 Work-in-process 26,988 42,694 Finished goods 23,163 24,948 Total inventories, net $ 160,543 $ 176,134 Property, Plant and Equipment Property, plant and equipment, net is comprised of the following: March 28, 2020 December 31, 2019 Land and building $ 46,913 $ 47,222 Machinery and equipment 56,475 56,504 Furniture and fixtures 4,134 3,968 Computer equipment and software 16,116 15,770 Leasehold improvements 13,171 13,069 136,809 136,533 Accumulated depreciation (39,836 ) (38,113 ) Total property, plant and equipment, net $ 96,973 $ 98,420 Other assets Other assets is comprised of the following: March 28, 2020 December 31, 2019 Convertible notes receivable, net of allowance of $2,000 $ — $ 3,000 Operating lease right-of-use assets 22,382 23,588 Other 1,268 1,351 Total other assets $ 23,650 $ 27,939 Accrued liabilities Accrued liabilities is comprised of the following: March 28, 2020 December 31, 2019 Payroll and related expenses $ 22,504 $ 19,365 Warranty 6,384 6,348 Other 507 491 Total accrued liabilities $ 29,395 $ 26,204 Other current liabilities Other current liabilities is comprised of the following: March 28, 2020 December 31, 2019 Contingent consideration - acquisitions $ 569 $ 569 Income tax payable 3,689 2,783 Current operating lease obligations 4,798 4,906 Customer deposits 471 1,994 Accrued inventory 1,120 1,614 Accrued professional fees 1,293 1,520 Other 5,218 5,786 Total other current liabilities $ 17,158 $ 19,172 Other non-current liabilities Other non-current liabilities is comprised of the following: March 28, 2020 December 31, 2019 Unrecognized tax benefits (including interest) $ 6,520 $ 6,384 Non-current operating lease obligations 18,950 19,970 Deferred revenue 2,462 2,464 Other 2,059 2,953 Total other non-current liabilities $ 29,991 $ 31,771

Commitments and Contingencies

Commitments and Contingencies	3 Months Ended
	Mar. 28, 2020
Commitments And Contingencies Disclosure [Abstract]
Commitments and Contingencies	NOTE 9. Commitments and Contingencies Factoring The Company maintains arrangements under which eligible accounts receivable in Japan are sold without recourse to unrelated third-party financial institutions. These receivables were not included in the condensed consolidated balance sheets as the criteria for sale treatment had been met. The Company sold $3,777 of receivables during the three months ended March 28, 2020. There were no material gains or losses on the sale of such receivables. There were no amounts due from such third-party financial institutions at March 28, 2020. Intellectual Property Indemnification Obligations The Company has entered into agreements with customers that include limited intellectual property indemnification obligations that are customary in the industry. These guarantees generally require the Company to compensate the other party for certain damages and costs incurred as a result of third-party intellectual property claims arising from these transactions. The nature of the intellectual property indemnification obligations prevents the Company from making a reasonable estimate of the maximum potential amount it could be required to pay to its customers. Historically, the Company has not made any indemnification payments under such agreements, and no amount has been accrued in the accompanying consolidated financial statements with respect to these indemnification guarantees. Warranty Reserves The Company generally provides a warranty on its products for a period of 12 to 14 months against defects in material and workmanship. The Company estimates the costs that may be incurred during the warranty period and records a liability in the amount of such costs at the time revenue is recognized. The Company’s estimate is based primarily on historical experience. The Company periodically assesses the adequacy of its recorded warranty liabilities and adjusts the amounts as necessary. Settlements of warranty reserves are generally associated with sales that occurred during the 12 to 14 months prior to the year-end and warranty accruals are related to sales during the same year. Changes in the Company’s warranty reserves are as follows: Three Months Ended March 28, March 31, 2020 2019 Balance, beginning of the period $ 6,348 $ 2,441 Accruals 2,313 672 Usage (2,277 ) (853 ) Balance, end of the period $ 6,384 $ 2,260 Warranty reserves are reported in the Condensed Consolidated Balance Sheets under the caption “Accrued liabilities.” Legal Matters From time to time, the Company is subject to legal proceedings and claims in the ordinary course of business. The following reflects an overview of the material activities with regard to these matters. Optical Solutions Inc. v. Nanometrics Incorporated (Case No. 18-cv-00417-BLF) Lin e of Credit The Company has a credit agreement with a bank that provides for a line of credit which is secured by the marketable securities the Company has with the bank. The Company is permitted to borrow up to 70% of the value of eligible securities held at the time the line of credit is accessed. The available line of credit as of March 28, 2020 was approximately $71.1 million with an available interest rate of 1.8%. The credit agreement is available to the Company until such time that either party terminates the arrangement at their discretion. The Company has not utilized the line of credit to date.

Revenue

Revenue	3 Months Ended
	Mar. 28, 2020
Revenue From Contract With Customer [Abstract]
Revenue	NOTE 10. Revenue The following table represents a disaggregation of revenue by timing of revenue: Three Months Ended March 28, March 31, 2020 2019 Point-in-time $ 133,745 $ 56,591 Over-time 6,183 4,301 Total revenue $ 139,928 $ 60,892 See Note 16 of the Notes to the Condensed Consolidated Financial Statements for additional discussion of the Company’s disaggregated revenue in detail. Contract Liabilities The Company records contract liabilities when the customer has been billed in advance of the Company completing its performance obligations. These amounts are recorded as deferred revenue in the Condensed Consolidated Balance Sheets. Changes in deferred revenue were as follows: Three Months Ended March 28, March 31, 2020 2019 Balance, beginning of the period $ 15,093 $ 8,080 Deferral of revenue 14,434 1,805 Recognition of deferred revenue (11,495 ) (1,198 ) Balance, end of the period $ 18,032 $ 8,687

Share-Based Compensation

Share-Based Compensation	3 Months Ended
	Mar. 28, 2020
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Share-Based Compensation	NOTE 11. Share-Based Compensation Restricted Stock Unit Activity A summary of the Company’s restricted stock unit activity with respect to the three months ended March 28, 2020 is as follows: Number of Shares Weighted Average Grant Date Fair Value Nonvested at December 31, 2019 1,107 $ 28.89 Granted 127 $ 43.13 Vested (169 ) $ 29.02 Forfeited (60 ) $ 29.12 Nonvested at March 28, 2020 1,005 $ 30.58 As of March 28, 2020 and December 31, 2019, there was $22,111 and $22,230 of total unrecognized compensation cost related to restricted stock units granted under the Company’s stock plans, respectively. That cost is expected to be recognized over a weighted average period of 1.9 years for each of the respective periods.

Other Income, Net

Other Income, Net	3 Months Ended
	Mar. 28, 2020
Other Income Expense [Abstract]
Other Income, Net	NOTE 12. Other Income, Net Other income, net, is comprised of the following: Three Months Ended March 28, March 31, 2020 2019 Foreign currency exchange gains (losses), net $ (35 ) $ 381 Other 67 — Total other income, net $ 32 $ 381

Income Taxes

Income Taxes	3 Months Ended
	Mar. 28, 2020
Income Tax Disclosure [Abstract]
Income Taxes	NOTE 13. Income Taxes The following table provides details of income taxes: Three Months Ended March 28, March 31, 2020 2019 (Loss) income before income taxes $ (4,004 ) $ 8,795 Provision for income taxes $ 400 $ 1,219 Effective tax rate (10 %) 14 % The income tax provision for the three months ended March 28, 2020 was computed based on the Company’s annual forecast of profit by jurisdiction and forecasted effective tax rate for the year. The changes in the Company’s effective tax rate for the three months ended March 28, 2020 as compared to the three months ended March 31, 2019 are primarily due to (i) changes in the mix of forecasted earnings by jurisdictions, (ii) computed research and development credits on forecasted earnings levels, and (iii) a one-time provision for additional withholding tax related to a dividend distribution from the Company’s Korea subsidiary. The Company’s recorded effective tax rate is less than the U.S. statutory rate primarily due to projected Foreign Derived Intangible Income Deductions and federal research and development tax credits. The Company currently has a partial valuation allowance recorded against certain foreign and state net operating loss and credit carryforwards where the realizability of such deferred tax assets is substantially in doubt. Each quarter, the Company assesses the likelihood that it will be able to recover its deferred tax assets. The Company considers available evidence, both positive and negative, including forecasted earnings in assessing its need for a valuation allowance. As a result of the Company’s analysis, it concluded that it is more likely than not that a portion of its deferred tax assets will not be realized. Therefore, the Company continues to provide a valuation allowance against certain deferred tax assets. The Company continues to monitor available evidence and may reverse some or all of the remaining valuation allowance in future periods, if appropriate. The Company has a recorded valuation allowance against certain of its deferred tax assets of $14,116 and $14,160 as of March 28, 2020 and December 31, 2019, respectively. On March 27, 2020, the “Coronavirus Aid, Relief and Economic Security Act” (the “CARES Act”) was enacted. The CARES Act includes provisions relating to refundable payroll tax credits, deferment of the employer portion of certain payroll taxes, net operating loss carryback periods, alternative minimum tax credit refunds, modifications to the net interest deduction limitations and technical corrections to tax depreciation methods for qualified improvement property. The Company is currently analyzing the impact of these changes and therefore an estimate of the impact to income taxes is not yet available.

Earnings (Loss) Per Share

Earnings (Loss) Per Share	3 Months Ended
	Mar. 28, 2020
Earnings Per Share [Abstract]
Earnings (Loss) Per Share	NOTE 14. Earnings (Loss) Per Share Basic earnings (loss) per share is calculated using the weighted average number of shares of common stock outstanding during the period. Diluted earnings per share is computed in the same manner and also gives effect to all dilutive common stock equivalent shares outstanding during the period. Potential common shares that would have the effect of increasing diluted earnings per share are considered to be anti-dilutive. In accordance with U.S. GAAP, these shares were not included in calculating diluted earnings per share. For the three months ended March 28, 2020, all weighted average outstanding stock options and restricted stock units totaling 1,087, were excluded from the computation of diluted loss per share because the effect in the period would be anti-dilutive. For the three months ended March 31, 2019, the weighted average number of restricted stock units excluded from the computation of diluted earnings per share were 167 . The Company’s basic and diluted earnings per share amounts are as follows: Three Months Ended March 28, March 31, 2020 2019 Numerator: Net (loss) income $ (4,404 ) $ 7,576 Denominator: Basic (loss) earnings per share - weighted average shares outstanding 50,121 24,863 Effect of potential dilutive securities: Employee stock options and restricted stock units - dilutive shares — 281 Diluted (loss) earnings per share - weighted average shares outstanding 50,121 25,144 (Loss) earnings per share: Basic $ (0.09 ) $ 0.30 Diluted $ (0.09 ) $ 0.30

Accumulated Other Comprehensive

Accumulated Other Comprehensive Loss	3 Months Ended
	Mar. 28, 2020
Accumulated Other Comprehensive Loss [Abstract]
Accumulated Other Comprehensive Loss	NOTE 15. Accumulated Other Comprehensive Loss The components of accumulated other comprehensive loss, net of tax at March 28, 2020, as well as the activity for the three months ended March 28, 2020, were as follows: Accumulated Foreign Currency Translation Adjustment Accumulated Net Unrealized Loss on Available-For-Sale Marketable Securities Accumulated Other Comprehensive Loss Balance at December 31, 2019 $ 564 $ 34 $ 598 Net current period other comprehensive loss 2,231 526 2,757 Reclassifications — — — Balance at March 28, 2020 $ 2,795 $ 560 $ 3,355

Segment Reporting and Geographi

Segment Reporting and Geographic Information	3 Months Ended
	Mar. 28, 2020
Segment Reporting [Abstract]
Segment Reporting and Geographic Information	NOTE 16. Segment Reporting and Geographic Information The Company and its subsidiaries currently operate in a single operating segment: the design, development, manufacture and support of high-performance process control defect inspection and metrology, advanced packaging lithography and process control software systems used by microelectronics device manufacturers. Therefore, the Company has one reportable segment. The Company’s chief operating decision maker is the Chief Executive Officer (the “CEO”). The CEO allocates resources and assesses performance of the business and other activities at the reportable segment level. The following table lists the different sources of revenue: Three Months Ended March 28, March 31, 2020 2019 Systems and software 114,330 82 % 49,809 82 % Parts 13,575 10 % 8,077 13 % Services 12,023 8 % 3,006 5 % Total revenue $ 139,928 100 % $ 60,892 100 % The Company’s significant operations outside the United States include sales, service and application offices in Asia and Europe. For geographical revenue reporting, revenue is attributed to the geographic location to which the product is shipped. Revenu e by geographic region is as follows: Three Months Ended March 28, March 31, 2020 2019 Revenue from third parties: United States $ 19,648 $ 9,131 Taiwan 35,181 11,031 Japan 15,027 3,940 China 31,383 16,044 South Korea 20,757 10,771 Singapore 2,590 2,016 Other Asia 273 993 Germany 6,082 1,850 Other Europe 8,987 5,116 Total revenue $ 139,928 $ 60,892 The following customers accounted for more than 10% of total revenue for the indicated periods: Three Months Ended March 28, March 31, 2020 2019 Customer A 17.5 % 3.8 % Customer B 17.0 % 6.2 % Customer C 5.7 % 27.2 %

Share Repurchase Authorization

Share Repurchase Authorization	3 Months Ended
	Mar. 28, 2020
Share Repurchase Program [Abstract]
Share Repurchase Authorization	NOTE 17. Share Repurchase Authorization Following the Merger, the Company assumed the share repurchase authorization previously approved by the former Nanometrics Board of Directors. This share repurchase authorization allows for the Company to purchase up to $80,000 worth of shares of its common stock. Under the terms of this share repurchase authorization, shares may be repurchased through open market or privately negotiated transactions. Share repurchases during the three months ended March 28, 2020 were made under this repurchase authorization and at March 28, 2020, there was $46,385 available for future share repurchases. During the three months ended March 31, 2019, share repurchases were made under a legacy Rudolph share repurchase authorization which was terminated on October 25, 2019 due to closing of the Merger. See Note 2 for additional information regarding the Merger. The following table summarizes the Company’s share repurchases for the periods indicated: Three Months Ended March 28, March 31, 2020 2019 Shares of common stock repurchased 1,250 30 Cost of shares repurchased $ 33,614 $ 744 Average price paid per share $ 26.89 $ 24.68

Basis of Presentation (Policies

Basis of Presentation (Policies)	3 Months Ended
	Mar. 28, 2020
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Reclassifications	Reclassifications . In conjunction with the Merger, the Company assessed the need to realign its financial statement presentation and certain income statement classifications were adjusted with prior periods reclassified to conform with current period presentation. The changes made were as follows: • Amounts related to sales and marketing are now presented on a separate line on the Condensed Consolidated Statements of Operations and were previously reported under the caption “Selling, general and administrative.” • Amounts related to applications engineering are now presented under the caption, “Sales and marketing” on the Condensed Consolidated Statements of Operations and were previously reported under the caption “Research and development.”
Recent Accounting Pronouncements	Recent Accounting Pronouncements Recently Adopted Effective January 1, 2020, the Company adopted Accounting Standards Update (“ASU”) No. 2018-13, “Fair Value Measurement (Topic 820): Disclosure Framework – Changes to the Disclosure Requirements for Fair Value Measurement.” This ASU is part of the Financial Account Standard Board’s (“FASB”) larger disclosure framework project intended to improve the effectiveness of financial statement footnote disclosure. ASU No. 2018-13 modifies required fair value disclosures related primarily to Level 3 investments. This ASU is effective for annual periods beginning after December 15, 2019 and interim periods within those annual periods. The adoption of ASU No. 2018-13 did not have a material impact on the Company’s consolidated financial position, results of operations, and cash flows. Effective January 1, 2020, the Company adopted ASU No. 2017-09, “Compensation - Stock Compensation (Topic 718): Scope of Modification Accounting.” This ASU amends the scope of modification accounting for share-based payment arrangements and provides guidance on the types of changes to the terms or conditions of share-based payment awards to which an entity would be required to apply modification accounting under Accounting Standards Codification (“ASC”) 718. The ASU is effective for the fiscal years beginning after December 15, 2019 and for interim periods within those fiscal years. The adoption of ASU No. 2017-09 did not have a material impact on the Company’s consolidated financial position, results of operations, and cash flows. Effective January 1, 2020, the Company adopted ASU No. 2016-13, “Financial Instruments – Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments,” which represents a credit loss standard that changes the impairment model for most financial assets and certain other financial instruments. Specifically, this guidance requires entities to utilize a new “expected loss” model as it relates to trade receivables, notes and other commitments to extend credit held by a reporting entity Recently Issued In December 2019, the FASB issued ASU No. 2019-12, “Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes.” This standard simplifies the accounting for income taxes by eliminating certain exceptions to the guidance in Topic 740 related to the approach for intraperiod tax allocation, the methodology for calculating income taxes in an interim period and the recognition of deferred tax liabilities for outside basis differences. The new guidance also simplifies aspects of the accounting for franchise Recently issued accounting guidance not discussed above is not applicable or is not expected to have a material impact to the Company’s consolidated financial position, results of operations, and cash flows.

Business Combination (Tables)

Business Combination (Tables)	3 Months Ended
	Mar. 28, 2020
Business Combinations [Abstract]
Summary of Preliminary Allocation of the Total Purchase Consideration to Initial Estimated Fair Values of the Assets Acquired and Liabilities Assumed	The following table summarizes the preliminary allocation of the total purchase consideration to the initial estimated fair values of the assets acquired and liabilities assumed as of October 25, 2019, as well as adjustments aggregating $478 to other non-current liabilities during the three months ended March 28, 2020: Cash and cash equivalents $ 43,882 Marketable securities 94,389 Account receivables 49,917 Inventories 98,478 Prepaid expenses and other current assets 7,734 Property, plant and equipment 77,451 Operating lease right-of-use assets 9,658 Identifiable intangible assets 374,900 Deferred income taxes 1,352 Other assets 850 Total assets acquired 758,611 Accounts payable (23,361 ) Payroll and related expenses (20,290 ) Deferred revenue (5,931 ) Other current liabilities (10,739 ) Income taxes payable (2,699 ) Other non-current liabilities (90,591 ) Net assets acquired 605,000 Goodwill 285,131 Total purchase consideration $ 890,131

Fair Value Measurements - (Tabl

Fair Value Measurements - (Tables)	3 Months Ended
	Mar. 28, 2020
Fair Value Disclosures [Abstract]
Schedule of Assets and Liabilities Carried at Fair Value Measured on a Recurring Basis	The following tables provide the assets and liabilities carried at fair value measured on a recurring basis at March 28, 2020 and December 31, 2019: Fair Value Measurements Using Carrying Value Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) March 28, 2020 Assets: Available-for-sale debt securities: Municipal notes and bonds $ 70,785 $ — $ 70,785 $ — Asset-backed securities 12,159 — 12,159 — Certificates of deposit 32,905 — 32,905 — Commercial paper 42,446 — 42,446 — Corporate bonds 32,334 — 32,334 — Foreign currency forward contracts 283 — 283 — Total assets $ 190,912 $ — $ 190,912 $ — Liabilities: Contingent consideration - acquisitions $ 569 $ — $ — $ 569 Total liabilities $ 569 $ — $ — $ 569 December 31, 2019 Assets: Available-for-sale debt securities: Municipal notes and bonds $ 81,108 $ — $ 81,108 $ — Asset-backed securities 10,779 — 10,779 — Certificates of deposit 30,507 — 30,507 — Commercial paper 30,708 — 30,708 — Corporate bonds 36,461 — 36,461 — Foreign currency forward contracts 120 — 120 — Total assets $ 189,683 $ — $ 189,683 $ — Liabilities: Contingent consideration - acquisitions $ 569 $ — $ — $ 569 Total liabilities $ 569 $ — $ — $ 569
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation	This table presents a reconciliation of all liabilities measured at fair value on a recurring basis using significant unobservable inputs (Level 3) for the three months ended March 28, 2020: Fair Value Measurements Using Significant Unobservable Inputs (Level 3) Balance at December 31, 2019 $ 569 Additions — Payments — Transfer into (out of) Level 3 — Balance at March 28, 2020 $ 569

Marketable Securities - (Tables

Marketable Securities - (Tables)	3 Months Ended
	Mar. 28, 2020
Marketable Securities [Abstract]
Schedule of Marketable Securities by Category	At March 28, 2020 and December 31, 2019, marketable securities are categorized as follows: Amortized Cost Gross Unrealized Holding Gains Gross Unrealized Holding Losses Fair Value March 28, 2020 Municipal notes and bonds $ 70,499 $ 296 $ 10 $ 70,785 Asset-backed securities 12,216 2 59 12,159 Certificates of deposit 33,154 13 262 32,905 Commercial paper 42,511 1 66 42,446 Corporate bonds 32,507 6 179 32,334 Total marketable securities $ 190,887 $ 318 $ 576 $ 190,629 December 31, 2019 Municipal notes and bonds $ 80,926 $ 188 $ 6 $ 81,108 Asset-backed securities 10,767 12 — 10,779 Certificates of deposit 30,500 7 — 30,507 Commercial paper 30,707 1 — 30,708 Corporate bonds 36,409 52 — 36,461 Total marketable securities $ 189,309 $ 260 $ 6 $ 189,563
Schedule of Amortized Cost and Estimated Fair Value of Marketable Securities Classified by Maturity Date	The amortized cost and estimated fair value of marketable securities classified by the maturity date listed on the security, regardless of the Condensed Consolidated Balance Sheets classification, is as follows at March 28, 2020 and December 31, 2019: March 28, 2020 December 31, 2019 Amortized Cost Fair Value Amortized Cost Fair Value Due within one year $ 155,514 $ 155,462 $ 152,649 $ 152,852 Due after one through five years 35,373 35,167 36,660 36,711 Due after five through ten years — — — — Due after ten years — — — — Total marketable securities $ 190,887 $ 190,629 $ 189,309 $ 189,563
Summary of Estimated Fair Value and Gross Unrealized Holding Losses of Marketable Securities in Unrealized Loss Position	The following table summarizes the estimated fair value and gross unrealized holding losses of marketable securities, aggregated by investment instrument and period of time in an unrealized loss position, at March 28, 2020 and December 31, 2019: In Unrealized Loss Position For Less Than 12 Months In Unrealized Loss Position For Greater Than 12 Months Fair Value Gross Unrealized Losses Fair Value Gross Unrealized Losses March 28, 2020 Municipal notes and bonds $ 5,086 $ 10 $ — $ — Asset-backed securities 10,978 59 — — Certificates of deposit 23,841 262 — — Commercial paper 22,457 66 — — Corporate bonds 25,458 179 — — Total $ 87,820 $ 576 $ — $ — December 31, 2019 Municipal notes and bonds $ 14,166 $ 6 $ — $ — Total $ 14,166 $ 6 $ — $ —

Derivative Instruments and He_2

Derivative Instruments and Hedging Activities (Tables)	3 Months Ended
	Mar. 28, 2020
Derivative Instruments And Hedging Activities Disclosure [Abstract]
Forward Contracts and Related Fair Values	The dollar equivalent of the U.S. dollar forward contracts and related fair values as of March 28, 2020 and December 31, 2019 were as follows: March 28, 2020 December 31, 2019 Notional amount $ 29,031 $ 38,887 Fair value of asset $ 283 $ 120

Purchased Intangible Assets - (

Purchased Intangible Assets - (Tables)	3 Months Ended
	Mar. 28, 2020
Goodwill And Intangible Assets Disclosure [Abstract]
Changes in the Carrying Amount of Goodwill	The changes in the carrying amount of goodwill are as follows: Balance at December 31, 2019 $ 307,148 Goodwill adjustments (Note 2) 478 Balance at March 28, 2020 $ 307,626
Schedule of Purchased Intangible Assets	Purchased intangible assets as of March 28, 2020 and December 31, 2019 are as follows: Gross Carrying Amount Accumulated Amortization Net March 28, 2020 Finite-lived intangibles: Developed technology $ 326,726 $ 78,636 $ 248,090 Customer and distributor relationships 69,261 13,739 55,522 Trademarks and trade names 12,461 4,451 8,010 Total finite-lived intangible assets 408,448 96,826 311,622 In-process research and development 46,600 — 46,600 Total identifiable intangible assets $ 455,048 $ 96,826 $ 358,222 December 31, 2019 Finite-lived intangibles: Developed technology $ 326,726 $ 67,861 $ 258,865 Customer and distributor relationships 69,261 11,078 58,183 Trademarks and trade names 12,461 4,156 8,305 Total finite-lived intangible assets 408,448 83,095 325,353 In-process research and development 46,600 — 46,600 Total identifiable intangible assets $ 455,048 $ 83,095 $ 371,953

Balance Sheet Details (Tables)

Balance Sheet Details (Tables)	3 Months Ended
	Mar. 28, 2020
Balance Sheet Detail [Abstract]
Schedule of Inventories	Inventories, net are comprised of the following: March 28, 2020 December 31, 2019 Materials $ 110,392 $ 108,492 Work-in-process 26,988 42,694 Finished goods 23,163 24,948 Total inventories, net $ 160,543 $ 176,134
Schedule of Property, Plant and Equipment, Net	Property, plant and equipment, net is comprised of the following: March 28, 2020 December 31, 2019 Land and building $ 46,913 $ 47,222 Machinery and equipment 56,475 56,504 Furniture and fixtures 4,134 3,968 Computer equipment and software 16,116 15,770 Leasehold improvements 13,171 13,069 136,809 136,533 Accumulated depreciation (39,836 ) (38,113 ) Total property, plant and equipment, net $ 96,973 $ 98,420
Schedule of Other Assets	Other assets is comprised of the following: March 28, 2020 December 31, 2019 Convertible notes receivable, net of allowance of $2,000 $ — $ 3,000 Operating lease right-of-use assets 22,382 23,588 Other 1,268 1,351 Total other assets $ 23,650 $ 27,939
Schedule of Accrued Liabilities	Accrued liabilities is comprised of the following: March 28, 2020 December 31, 2019 Payroll and related expenses $ 22,504 $ 19,365 Warranty 6,384 6,348 Other 507 491 Total accrued liabilities $ 29,395 $ 26,204
Schedule of Other Current Liabilities	Other current liabilities is comprised of the following: March 28, 2020 December 31, 2019 Contingent consideration - acquisitions $ 569 $ 569 Income tax payable 3,689 2,783 Current operating lease obligations 4,798 4,906 Customer deposits 471 1,994 Accrued inventory 1,120 1,614 Accrued professional fees 1,293 1,520 Other 5,218 5,786 Total other current liabilities $ 17,158 $ 19,172
Schedule of Other Non-Current Liabilities	Other non-current liabilities is comprised of the following: March 28, 2020 December 31, 2019 Unrecognized tax benefits (including interest) $ 6,520 $ 6,384 Non-current operating lease obligations 18,950 19,970 Deferred revenue 2,462 2,464 Other 2,059 2,953 Total other non-current liabilities $ 29,991 $ 31,771

Commitments and Contingencies (

Commitments and Contingencies (Tables)	3 Months Ended
	Mar. 28, 2020
Commitments And Contingencies Disclosure [Abstract]
Schedule of Changes in Warranty Reserves	Changes in the Company’s warranty reserves are as follows: Three Months Ended March 28, March 31, 2020 2019 Balance, beginning of the period $ 6,348 $ 2,441 Accruals 2,313 672 Usage (2,277 ) (853 ) Balance, end of the period $ 6,384 $ 2,260

Revenue (Tables)

Revenue (Tables)	3 Months Ended
	Mar. 28, 2020
Revenue From Contract With Customer [Abstract]
Schedule of Disaggregation of Revenue	The following table represents a disaggregation of revenue by timing of revenue: Three Months Ended March 28, March 31, 2020 2019 Point-in-time $ 133,745 $ 56,591 Over-time 6,183 4,301 Total revenue $ 139,928 $ 60,892
Schedule of Changes in Deferred Revenue	Changes in deferred revenue were as follows: Three Months Ended March 28, March 31, 2020 2019 Balance, beginning of the period $ 15,093 $ 8,080 Deferral of revenue 14,434 1,805 Recognition of deferred revenue (11,495 ) (1,198 ) Balance, end of the period $ 18,032 $ 8,687

Share-Based Compensation - (Tab

Share-Based Compensation - (Tables)	3 Months Ended
	Mar. 28, 2020
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Summary of Restricted Stock Unit Activity	A summary of the Company’s restricted stock unit activity with respect to the three months ended March 28, 2020 is as follows: Number of Shares Weighted Average Grant Date Fair Value Nonvested at December 31, 2019 1,107 $ 28.89 Granted 127 $ 43.13 Vested (169 ) $ 29.02 Forfeited (60 ) $ 29.12 Nonvested at March 28, 2020 1,005 $ 30.58

Other Income, Net (Tables)

Other Income, Net (Tables)	3 Months Ended
	Mar. 28, 2020
Other Income Expense [Abstract]
Schedule of Other Income, Net	Other income, net, is comprised of the following: Three Months Ended March 28, March 31, 2020 2019 Foreign currency exchange gains (losses), net $ (35 ) $ 381 Other 67 — Total other income, net $ 32 $ 381

Income Taxes - (Tables)

Income Taxes - (Tables)	3 Months Ended
	Mar. 28, 2020
Income Tax Disclosure [Abstract]
Details of Income Tax	The following table provides details of income taxes: Three Months Ended March 28, March 31, 2020 2019 (Loss) income before income taxes $ (4,004 ) $ 8,795 Provision for income taxes $ 400 $ 1,219 Effective tax rate (10 %) 14 %

Earnings (Loss) Per Share - (Ta

Earnings (Loss) Per Share - (Tables)	3 Months Ended
	Mar. 28, 2020
Earnings Per Share [Abstract]
Schedule of Basic and Diluted Earnings Per Share	The Company’s basic and diluted earnings per share amounts are as follows: Three Months Ended March 28, March 31, 2020 2019 Numerator: Net (loss) income $ (4,404 ) $ 7,576 Denominator: Basic (loss) earnings per share - weighted average shares outstanding 50,121 24,863 Effect of potential dilutive securities: Employee stock options and restricted stock units - dilutive shares — 281 Diluted (loss) earnings per share - weighted average shares outstanding 50,121 25,144 (Loss) earnings per share: Basic $ (0.09 ) $ 0.30 Diluted $ (0.09 ) $ 0.30

Accumulated Other Comprehensi_2

Accumulated Other Comprehensive Loss (Tables)	3 Months Ended
	Mar. 28, 2020
Accumulated Other Comprehensive Loss [Abstract]
Components of Accumulated Other Comprehensive Loss, Net of Tax	The components of accumulated other comprehensive loss, net of tax at March 28, 2020, as well as the activity for the three months ended March 28, 2020, were as follows: Accumulated Foreign Currency Translation Adjustment Accumulated Net Unrealized Loss on Available-For-Sale Marketable Securities Accumulated Other Comprehensive Loss Balance at December 31, 2019 $ 564 $ 34 $ 598 Net current period other comprehensive loss 2,231 526 2,757 Reclassifications — — — Balance at March 28, 2020 $ 2,795 $ 560 $ 3,355

Segment Reporting and Geograp_2

Segment Reporting and Geographic Information - (Tables)	3 Months Ended
	Mar. 28, 2020
Segment Reporting [Abstract]
Schedule of Revenue from External Customers by Products and Services	The following table lists the different sources of revenue: Three Months Ended March 28, March 31, 2020 2019 Systems and software 114,330 82 % 49,809 82 % Parts 13,575 10 % 8,077 13 % Services 12,023 8 % 3,006 5 % Total revenue $ 139,928 100 % $ 60,892 100 %
Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area	For geographical revenue reporting, revenue is attributed to the geographic location to which the product is shipped. Revenu e by geographic region is as follows: Three Months Ended March 28, March 31, 2020 2019 Revenue from third parties: United States $ 19,648 $ 9,131 Taiwan 35,181 11,031 Japan 15,027 3,940 China 31,383 16,044 South Korea 20,757 10,771 Singapore 2,590 2,016 Other Asia 273 993 Germany 6,082 1,850 Other Europe 8,987 5,116 Total revenue $ 139,928 $ 60,892
Schedule of Revenue by Major Customer by Reporting Segments	The following customers accounted for more than 10% of total revenue for the indicated periods: Three Months Ended March 28, March 31, 2020 2019 Customer A 17.5 % 3.8 % Customer B 17.0 % 6.2 % Customer C 5.7 % 27.2 %

Share Repurchase Authorization

Share Repurchase Authorization (Tables)	3 Months Ended
	Mar. 28, 2020
Share Repurchase Program [Abstract]
Summary of Stock Repurchases	The following table summarizes the Company’s share repurchases for the periods indicated: Three Months Ended March 28, March 31, 2020 2019 Shares of common stock repurchased 1,250 30 Cost of shares repurchased $ 33,614 $ 744 Average price paid per share $ 26.89 $ 24.68

Business Combination - Textual

Business Combination - Textual (Details) $ in Thousands	3 Months Ended
	Mar. 28, 2020USD ($)
Business Acquisition [Line Items]
Aggregate adjustments to estimated fair values of assets acquired and liabilities	$ 478
Other Non-current Liabilities [Member] | Rudolph and Nanometrics [Member]
Business Acquisition [Line Items]
Aggregate adjustments to estimated fair values of assets acquired and liabilities	$ 478

Business Combination - Summary

Business Combination - Summary of Preliminary Allocation of the Total Purchase Consideration to Initial Estimated Fair Values of the Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands	Mar. 28, 2020	Dec. 31, 2019	Oct. 25, 2019
Business Acquisition [Line Items]
Goodwill	$ 307,626	$ 307,148
Rudolph Technologies, Inc. [Member]
Business Acquisition [Line Items]
Cash and cash equivalents			$ 43,882
Marketable securities			94,389
Account receivables			49,917
Inventories			98,478
Prepaid expenses and other current assets			7,734
Property, plant and equipment			77,451
Operating lease right-of-use assets			9,658
Identifiable intangible assets			374,900
Deferred income taxes			1,352
Other assets			850
Total assets acquired			758,611
Accounts payable			(23,361)
Payroll and related expenses			(20,290)
Deferred revenue			(5,931)
Other current liabilities			(10,739)
Income taxes payable			(2,699)
Other non-current liabilities			(90,591)
Net assets acquired			605,000
Goodwill			285,131
Total purchase consideration			$ 890,131

Fair Value Measurements - Sched

Fair Value Measurements - Schedule of Assets and Liabilities Carried at Fair Value Measured on a Recurring Basis (Details) - USD ($) $ in Thousands	Mar. 28, 2020	Dec. 31, 2019
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Available-for-sale debt securities	$ 190,629	$ 189,563
Carrying Value [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Foreign currency forward contracts	283	120
Total assets	190,912	189,683
Contingent consideration - acquisitions	569	569
Total liabilities	569	569
Carrying Value [Member] | Fair Value, Measurements, Recurring [Member] | Municipal notes and bonds [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Available-for-sale debt securities	70,785	81,108
Carrying Value [Member] | Fair Value, Measurements, Recurring [Member] | Asset-backed securities [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Available-for-sale debt securities	12,159	10,779
Carrying Value [Member] | Fair Value, Measurements, Recurring [Member] | Certificates of deposits [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Available-for-sale debt securities	32,905	30,507
Carrying Value [Member] | Fair Value, Measurements, Recurring [Member] | Commercial paper [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Available-for-sale debt securities	42,446	30,708
Carrying Value [Member] | Fair Value, Measurements, Recurring [Member] | Corporate bonds [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Available-for-sale debt securities	32,334	36,461
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Foreign currency forward contracts	0	0
Total assets	0	0
Contingent consideration - acquisitions	0	0
Total liabilities	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fair Value, Measurements, Recurring [Member] | Municipal notes and bonds [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Available-for-sale debt securities	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fair Value, Measurements, Recurring [Member] | Asset-backed securities [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Available-for-sale debt securities	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fair Value, Measurements, Recurring [Member] | Certificates of deposits [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Available-for-sale debt securities	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fair Value, Measurements, Recurring [Member] | Commercial paper [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Available-for-sale debt securities	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fair Value, Measurements, Recurring [Member] | Corporate bonds [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Available-for-sale debt securities	0	0
Significant Other Observable Inputs (Level 2) [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Foreign currency forward contracts	283	120
Total assets	190,912	189,683
Contingent consideration - acquisitions	0	0
Total liabilities	0	0
Significant Other Observable Inputs (Level 2) [Member] | Fair Value, Measurements, Recurring [Member] | Municipal notes and bonds [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Available-for-sale debt securities	70,785	81,108
Significant Other Observable Inputs (Level 2) [Member] | Fair Value, Measurements, Recurring [Member] | Asset-backed securities [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Available-for-sale debt securities	12,159	10,779
Significant Other Observable Inputs (Level 2) [Member] | Fair Value, Measurements, Recurring [Member] | Certificates of deposits [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Available-for-sale debt securities	32,905	30,507
Significant Other Observable Inputs (Level 2) [Member] | Fair Value, Measurements, Recurring [Member] | Commercial paper [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Available-for-sale debt securities	42,446	30,708
Significant Other Observable Inputs (Level 2) [Member] | Fair Value, Measurements, Recurring [Member] | Corporate bonds [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Available-for-sale debt securities	32,334	36,461
Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Foreign currency forward contracts	0	0
Total assets	0	0
Contingent consideration - acquisitions	569	569
Total liabilities	569	569
Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Recurring [Member] | Municipal notes and bonds [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Available-for-sale debt securities	0	0
Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Recurring [Member] | Asset-backed securities [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Available-for-sale debt securities	0	0
Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Recurring [Member] | Certificates of deposits [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Available-for-sale debt securities	0	0
Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Recurring [Member] | Commercial paper [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Available-for-sale debt securities	0	0
Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Recurring [Member] | Corporate bonds [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Available-for-sale debt securities	$ 0	$ 0

Fair Value Measurements - Textu

Fair Value Measurements - Textual (Details)	Mar. 28, 2020	Mar. 31, 2019
Significant Unobservable Inputs (Level 3) [Member] | Measurement Input Discount Rate [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Estimated discount rates	0	0.092

Fair Value Measurements - Fair

Fair Value Measurements - Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation (Details) - Fair Value, Measurements, Recurring [Member] - Significant Unobservable Inputs (Level 3) [Member] $ in Thousands	3 Months Ended
	Mar. 28, 2020USD ($)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Balance at December 31, 2019	$ 569
Additions	0
Payments	0
Transfer into (out of) Level 3	0
Balance at March 28, 2020	$ 569

Marketable Securities - Schedul

Marketable Securities - Schedule of Marketable Securities by Category (Details) - USD ($) $ in Thousands	Mar. 28, 2020	Dec. 31, 2019
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 190,887	$ 189,309
Gross Unrealized Holding Gains	318	260
Gross Unrealized Holding Losses	576	6
Fair Value	190,629	189,563
Municipal notes and bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	70,499	80,926
Gross Unrealized Holding Gains	296	188
Gross Unrealized Holding Losses	10	6
Fair Value	70,785	81,108
Asset-backed securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	12,216	10,767
Gross Unrealized Holding Gains	2	12
Gross Unrealized Holding Losses	59
Fair Value	12,159	10,779
Certificates of deposits [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	33,154	30,500
Gross Unrealized Holding Gains	13	7
Gross Unrealized Holding Losses	262
Fair Value	32,905	30,507
Commercial paper [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	42,511	30,707
Gross Unrealized Holding Gains	1	1
Gross Unrealized Holding Losses	66
Fair Value	42,446	30,708
Corporate bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	32,507	36,409
Gross Unrealized Holding Gains	6	52
Gross Unrealized Holding Losses	179
Fair Value	$ 32,334	$ 36,461

Marketable Securities - Sched_2

Marketable Securities - Schedule of Amortized Cost and Estimated Fair Value of Marketable Securities Classified by Maturity Date (Details) - USD ($) $ in Thousands	Mar. 28, 2020	Dec. 31, 2019
Available For Sale Securities Debt Maturities Fair Value [Abstract]
Amortized Cost, Due within one year	$ 155,514	$ 152,649
Amortized Cost, Due after one through five years	35,373	36,660
Amortized Cost, Due after five through ten years	0	0
Amortized Cost, Due after ten years	0	0
Amortized Cost	190,887	189,309
Fair Value, Due within one year	155,462	152,852
Fair Value, Due after one through five years	35,167	36,711
Fair Value, Due after five through ten years	0	0
Fair Value, Due after ten years	0	0
Fair Value, Total marketable securities	$ 190,629	$ 189,563

Marketable Securities - Summary

Marketable Securities - Summary of Estimated Fair Value and Gross Unrealized Holding Losses of Marketable Securities in Unrealized Loss Position (Details) - USD ($) $ in Thousands	Mar. 28, 2020	Dec. 31, 2019
Schedule of Available-for-sale Securities [Line Items]
In Unrealized Loss Position For Less Than 12 Months, Fair Value	$ 87,820	$ 14,166
In Unrealized Loss Position For Less Than 12 Months, Gross Unrealized Losses	576	6
In Unrealized Loss Position For Greater Than 12 Months, Fair Value	0	0
In Unrealized Loss Position For Greater Than 12 Months, Gross Unrealized Losses	0	0
Municipal notes and bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
In Unrealized Loss Position For Less Than 12 Months, Fair Value	5,086	14,166
In Unrealized Loss Position For Less Than 12 Months, Gross Unrealized Losses	10	6
In Unrealized Loss Position For Greater Than 12 Months, Fair Value	0	0
In Unrealized Loss Position For Greater Than 12 Months, Gross Unrealized Losses	0	$ 0
Asset-backed securities [Member]
Schedule of Available-for-sale Securities [Line Items]
In Unrealized Loss Position For Less Than 12 Months, Fair Value	10,978
In Unrealized Loss Position For Less Than 12 Months, Gross Unrealized Losses	59
In Unrealized Loss Position For Greater Than 12 Months, Fair Value	0
In Unrealized Loss Position For Greater Than 12 Months, Gross Unrealized Losses	0
Certificates of deposits [Member]
Schedule of Available-for-sale Securities [Line Items]
In Unrealized Loss Position For Less Than 12 Months, Fair Value	23,841
In Unrealized Loss Position For Less Than 12 Months, Gross Unrealized Losses	262
In Unrealized Loss Position For Greater Than 12 Months, Fair Value	0
In Unrealized Loss Position For Greater Than 12 Months, Gross Unrealized Losses	0
Commercial paper [Member]
Schedule of Available-for-sale Securities [Line Items]
In Unrealized Loss Position For Less Than 12 Months, Fair Value	22,457
In Unrealized Loss Position For Less Than 12 Months, Gross Unrealized Losses	66
In Unrealized Loss Position For Greater Than 12 Months, Fair Value	0
In Unrealized Loss Position For Greater Than 12 Months, Gross Unrealized Losses	0
Corporate bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
In Unrealized Loss Position For Less Than 12 Months, Fair Value	25,458
In Unrealized Loss Position For Less Than 12 Months, Gross Unrealized Losses	179
In Unrealized Loss Position For Greater Than 12 Months, Fair Value	0
In Unrealized Loss Position For Greater Than 12 Months, Gross Unrealized Losses	$ 0

Derivative Instruments and He_3

Derivative Instruments and Hedging Activities - Forward Contracts and Related Fair Values (Details) - USD ($) $ in Thousands	Mar. 28, 2020	Dec. 31, 2019
Derivative Instruments And Hedging Activities Disclosure [Abstract]
Notional amount	$ 29,031	$ 38,887
Fair value of asset	$ 283	$ 120

Purchased Intangible Assets - C

Purchased Intangible Assets - Changes in the Carrying Amount of Goodwill (Details) $ in Thousands	3 Months Ended
	Mar. 28, 2020USD ($)
Goodwill Roll Forward
Balance at December 31, 2019	$ 307,148
Goodwill adjustments (Note 2)	478
Balance at March 28, 2020	$ 307,626

Purchased Intangible Assets - S

Purchased Intangible Assets - Schedule of Purchased Intangible Assets (Details) - USD ($) $ in Thousands	Mar. 28, 2020	Dec. 31, 2019
Finite Lived Intangible Assets [Line Items]
Finite-lived intangibles, Gross Carrying Amount	$ 408,448	$ 408,448
Finite-lived intangibles, Accumulated Amortization	96,826	83,095
Finite-lived intangibles, Net	311,622	325,353
Identifiable intangibles assets, Gross Carrying Amount	455,048	455,048
Identifiable intangibles assets, Accumulated Amortization	96,826	83,095
Identifiable intangibles assets, Net	358,222	371,953
Developed technology [Member]
Finite Lived Intangible Assets [Line Items]
Finite-lived intangibles, Gross Carrying Amount	326,726	326,726
Finite-lived intangibles, Accumulated Amortization	78,636	67,861
Finite-lived intangibles, Net	248,090	258,865
Customer and distributor relationships [Member]
Finite Lived Intangible Assets [Line Items]
Finite-lived intangibles, Gross Carrying Amount	69,261	69,261
Finite-lived intangibles, Accumulated Amortization	13,739	11,078
Finite-lived intangibles, Net	55,522	58,183
Trademarks and trade names [Member]
Finite Lived Intangible Assets [Line Items]
Finite-lived intangibles, Gross Carrying Amount	12,461	12,461
Finite-lived intangibles, Accumulated Amortization	4,451	4,156
Finite-lived intangibles, Net	8,010	8,305
In-process research and development [Member]
Finite Lived Intangible Assets [Line Items]
Identifiable intangibles assets, Gross Carrying Amount	46,600	46,600
Identifiable intangibles assets, Net	$ 46,600	$ 46,600

Purchased Intangible Assets - T

Purchased Intangible Assets - Textual (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 28, 2020	Mar. 31, 2019
Goodwill And Intangible Assets Disclosure [Abstract]
Amortization of intangibles	$ 13,732	$ 387
Estimated amortization expense, Remainder of 2020	40,009
Estimated amortization expense, 2021	48,009
Estimated amortization expense, 2022	47,610
Estimated amortization expense, 2023	47,135
Estimated amortization expense, 2024	41,450
Estimated amortization expense, 2025	$ 24,900

Convertible Notes Receivable -

Convertible Notes Receivable - Textual (Details) - USD ($)	3 Months Ended
	Mar. 28, 2020	Dec. 31, 2019	May 31, 2018
Loans And Leases Receivable Disclosure [Line Items]
Convertible notes receivable	$ 0	$ 3,000,000
Convertible Loan Agreement [Member] | Simax Precision Technologies Limited [Member]
Loans And Leases Receivable Disclosure [Line Items]
Funds available in multiple promissory notes			$ 15,000,000
Convertible notes rate of interest			4.25%
Settlement Agreement [Member] | Simax Precision Technologies Limited [Member]
Loans And Leases Receivable Disclosure [Line Items]
Convertible notes receivable	5,000,000
Settlement of convertible notes receivable	2,848,000
Convertible notes receivable, reserve amount	$ 2,152,000

Balance Sheet Details - Schedul

Balance Sheet Details - Schedule of Inventories (Details) - USD ($) $ in Thousands	Mar. 28, 2020	Dec. 31, 2019
Inventory Details [Abstract]
Materials	$ 110,392	$ 108,492
Work-in-process	26,988	42,694
Finished goods	23,163	24,948
Total inventories, net	$ 160,543	$ 176,134

Balance Sheet Details - Sched_2

Balance Sheet Details - Schedule of Property, Plant and Equipment, Net (Details) - USD ($) $ in Thousands	Mar. 28, 2020	Dec. 31, 2019
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	$ 136,809	$ 136,533
Accumulated depreciation	(39,836)	(38,113)
Total property, plant and equipment, net	96,973	98,420
Land and building [Member]
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	46,913	47,222
Machinery and equipment [Member]
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	56,475	56,504
Furniture and fixtures [Member]
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	4,134	3,968
Computer equipment and software [Member]
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	16,116	15,770
Leasehold improvements [Member]
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	$ 13,171	$ 13,069

Balance Sheet Details - Sched_3

Balance Sheet Details - Schedule of Other Assets (Details) - USD ($) $ in Thousands	Mar. 28, 2020	Dec. 31, 2019
Other Assets [Abstract]
Convertible notes receivable	$ 0	$ 3,000
Operating lease right-of-use assets	22,382	23,588
Other	1,268	1,351
Total other assets	$ 23,650	$ 27,939

Balance Sheet Details - Sched_4

Balance Sheet Details - Schedule of Other Assets (Parenthetical) (Details) - USD ($) $ in Thousands	Mar. 28, 2020	Dec. 31, 2019
Other Assets [Abstract]
Allowance for convertible notes receivable	$ 2,000	$ 2,000

Balance Sheet Details - Sched_5

Balance Sheet Details - Schedule of Accrued Liabilities (Details) - USD ($) $ in Thousands	Mar. 28, 2020	Dec. 31, 2019
Accrued Liabilities Current [Abstract]
Payroll and related expenses	$ 22,504	$ 19,365
Warranty	6,384	6,348
Other	507	491
Total accrued liabilities	$ 29,395	$ 26,204

Balance Sheet Details - Sched_6

Balance Sheet Details - Schedule of Other Current Liabilities (Details) - USD ($) $ in Thousands	Mar. 28, 2020	Dec. 31, 2019
Other Liabilities Current [Abstract]
Contingent consideration - acquisitions	$ 569	$ 569
Income tax payable	3,689	2,783
Current operating lease obligations	4,798	4,906
Customer deposits	471	1,994
Accrued inventory	1,120	1,614
Accrued professional fees	1,293	1,520
Other	5,218	5,786
Total other current liabilities	$ 17,158	$ 19,172

Balance Sheet Details - Sched_7

Balance Sheet Details - Schedule of Other Non-Current Liabilities (Details) - USD ($) $ in Thousands	Mar. 28, 2020	Dec. 31, 2019
Other Liabilities Noncurrent [Abstract]
Unrecognized tax benefits (including interest)	$ 6,520	$ 6,384
Non-current operating lease obligations	18,950	19,970
Deferred revenue	2,462	2,464
Other	2,059	2,953
Total other non-current liabilities	$ 29,991	$ 31,771

Commitments and Contingencies -

Commitments and Contingencies - Textual (Details)	3 Months Ended
	Mar. 28, 2020USD ($)
Commitments And Contingencies [Line Items]
Sold receivables amount	$ 3,777,000
Due from unrelated third parties	0
Liabilities recorded for obligations	$ 0
Percentage of maximum borrowing capacity of value of eligible securities	70.00%
Available line of credit	$ 71,100,000
Available interest rate on line of credit	1.80%
Minimum [Member]
Commitments And Contingencies [Line Items]
Warranty period	12 months
Maximum [Member]
Commitments And Contingencies [Line Items]
Warranty period	14 months

Commitments and Contingencies_2

Commitments and Contingencies - Schedule of Changes in Warranty Reserves (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 28, 2020	Mar. 31, 2019
Commitments And Contingencies Disclosure [Abstract]
Balance, beginning of the period	$ 6,348	$ 2,441
Accruals	2,313	672
Usage	(2,277)	(853)
Balance, end of the period	$ 6,384	$ 2,260

Revenue - Schedule of Disaggreg

Revenue - Schedule of Disaggregation of Revenue by Timing of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 28, 2020	Mar. 31, 2019
Disaggregation Of Revenue [Line Items]
Total revenue	$ 139,928	$ 60,892
Transferred at Point in Time [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	133,745	56,591
Transferred over Time [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	$ 6,183	$ 4,301

Revenue - Schedule of Changes i

Revenue - Schedule of Changes in Deferred Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 28, 2020	Mar. 31, 2019
Deferred Revenue Disclosure [Abstract]
Balance, beginning of the period	$ 15,093	$ 8,080
Deferral of revenue	14,434	1,805
Recognition of deferred revenue	(11,495)	(1,198)
Balance, end of the period	$ 18,032	$ 8,687

Share-Based Compensation - Summ

Share-Based Compensation - Summary of Restricted Stock Unit Activity (Details) - Restricted Stock Units (RSUs) [Member]	3 Months Ended
	Mar. 28, 2020$ / sharesshares
Activity for RSUs [Roll Forward]
Number of Shares, Beginning balance (in shares) | shares	1,107,000
Number of Shares, Granted (in shares) | shares	127,000
Number of Shares, Vested (in shares) | shares	(169,000)
Number of Shares, Forfeited (in shares) | shares	(60,000)
Number of Shares, Ending balance (in shares) | shares	1,005,000
Weighted Average Grant Date Fair Value for RSUs [Roll Forward]
Weighted Average Grant Date Fair Value, Beginning balance (in dollars per share) | $ / shares	$ 28.89
Weighted Average Grant Date Fair Value, Granted (in dollars per share) | $ / shares	43.13
Weighted Average Grant Date Fair Value, Vested (in dollars per share) | $ / shares	29.02
Weighted Average Grant Date Fair Value, Forfeited (in dollars per share) | $ / shares	29.12
Weighted Average Grant Date Fair Value, Ending balance (in dollars per share) | $ / shares	$ 30.58

Share-Based Compensation - Text

Share-Based Compensation - Textual (Details) - Restricted Stock Units (RSUs) [Member] - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 28, 2020	Dec. 31, 2019
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total unrecognized compensation cost related to restricted stock units granted	$ 22,111	$ 22,230
Unrecognized compensation cost related to restricted stock units, weighted average period	1 year 10 months 24 days	1 year 10 months 24 days

Other Income, Net - Schedule of

Other Income, Net - Schedule of Other Income, Net (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 28, 2020	Mar. 31, 2019
Other Income Expense [Abstract]
Foreign currency exchange gains (losses), net	$ (35)	$ 381
Other	67	0
Total other income, net	$ 32	$ 381

Income Taxes - Details of Incom

Income Taxes - Details of Income Tax (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 28, 2020	Mar. 31, 2019
Income Tax Disclosure [Abstract]
(Loss) income before income taxes	$ (4,004)	$ 8,795
Provision for income taxes	$ 400	$ 1,219
Effective tax rate	(10.00%)	14.00%

Income Taxes - Textual (Details

Income Taxes - Textual (Details) - USD ($) $ in Thousands	Mar. 28, 2020	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Deferred tax assets, valuation allowance	$ 14,116	$ 14,160

Earnings (Loss) Per Share - Tex

Earnings (Loss) Per Share - Textual (Details) - shares shares in Thousands	3 Months Ended
	Mar. 28, 2020	Mar. 31, 2019
Stock Options and Restricted Stock Units [Member]
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Weighted average number of shares excluded from the computation of diluted earnings per share	1,087
Restricted Stock Units (RSUs) [Member]
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Weighted average number of shares excluded from the computation of diluted earnings per share		167

Earnings (Loss) Per Share - Sch

Earnings (Loss) Per Share - Schedule of Basic and Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 28, 2020	Mar. 31, 2019
Earnings Per Share [Abstract]
Net (loss) income	$ (4,404)	$ 7,576
Basic (loss) earnings per share - weighted average shares outstanding	50,121	24,863
Employee stock options and restricted stock units - dilutive shares	0	281
Diluted (loss) earnings per share - weighted average shares outstanding	50,121	25,144
Basic	$ (0.09)	$ 0.30
Diluted	$ (0.09)	$ 0.30

Accumulated Other Comprehensi_3

Accumulated Other Comprehensive Loss - Components of Accumulated Other Comprehensive Loss, Net of Tax (Details) $ in Thousands	3 Months Ended
	Mar. 28, 2020USD ($)
Accumulated Other Comprehensive Income Loss [Line Items]
Balance at December 31, 2019	$ (1,264,026)
Balance at March 28, 2020	(1,225,805)
Accumulated Foreign Currency Translation Adjustment [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Balance at December 31, 2019	564
Net current period other comprehensive loss	2,231
Reclassifications	0
Balance at March 28, 2020	2,795
Accumulated Net Unrealized Loss on Available-For-Sale Marketable Securities [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Balance at December 31, 2019	34
Net current period other comprehensive loss	526
Reclassifications	0
Balance at March 28, 2020	560
Accumulated Other Comprehensive Loss [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Balance at December 31, 2019	598
Net current period other comprehensive loss	2,757
Reclassifications	0
Balance at March 28, 2020	$ 3,355

Segment Reporting and Geograp_3

Segment Reporting and Geographic Information - Additional Information (Details)	3 Months Ended
	Mar. 28, 2020Segment
Segment Reporting [Abstract]
Number of reportable segments	1

Segment Reporting and Geograp_4

Segment Reporting and Geographic Information - Schedule of Revenue from External Customers by Products and Services (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 28, 2020	Mar. 31, 2019
Segment Reporting Information [Line Items]
Total revenue	$ 139,928	$ 60,892
Sales [Member] | Product [Member]
Segment Reporting Information [Line Items]
Concentration risk, percentage	100.00%	100.00%
Systems and Software [Member]
Segment Reporting Information [Line Items]
Total revenue	$ 114,330	$ 49,809
Systems and Software [Member] | Sales [Member] | Product [Member]
Segment Reporting Information [Line Items]
Concentration risk, percentage	82.00%	82.00%
Parts Revenue [Member]
Segment Reporting Information [Line Items]
Total revenue	$ 13,575	$ 8,077
Parts Revenue [Member] | Sales [Member] | Product [Member]
Segment Reporting Information [Line Items]
Concentration risk, percentage	10.00%	13.00%
Service Revenue [Member]
Segment Reporting Information [Line Items]
Total revenue	$ 12,023	$ 3,006
Service Revenue [Member] | Sales [Member] | Product [Member]
Segment Reporting Information [Line Items]
Concentration risk, percentage	8.00%	5.00%

Segment Reporting and Geograp_5

Segment Reporting and Geographic Information - Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 28, 2020	Mar. 31, 2019
Segment Reporting Information [Line Items]
Total revenue	$ 139,928	$ 60,892
United States [Member]
Segment Reporting Information [Line Items]
Total revenue	19,648	9,131
Taiwan [Member]
Segment Reporting Information [Line Items]
Total revenue	35,181	11,031
Japan [Member]
Segment Reporting Information [Line Items]
Total revenue	15,027	3,940
China [Member]
Segment Reporting Information [Line Items]
Total revenue	31,383	16,044
South Korea [Member]
Segment Reporting Information [Line Items]
Total revenue	20,757	10,771
Singapore [Member]
Segment Reporting Information [Line Items]
Total revenue	2,590	2,016
Other Asia [Member]
Segment Reporting Information [Line Items]
Total revenue	273	993
Germany [Member]
Segment Reporting Information [Line Items]
Total revenue	6,082	1,850
Other Europe [Member]
Segment Reporting Information [Line Items]
Total revenue	$ 8,987	$ 5,116

Segment Reporting and Geograp_6

Segment Reporting and Geographic Information - Schedule of Revenue by Major Customer by Reporting Segments (Details) - Sales [Member] - Customer Concentration Risk [Member]	3 Months Ended
	Mar. 28, 2020	Mar. 31, 2019
Customer A [Member]
Segment Reporting Information [Line Items]
Entity-wide revenue, major customer, percentage	17.50%	3.80%
Customer B [Member]
Segment Reporting Information [Line Items]
Entity-wide revenue, major customer, percentage	17.00%	6.20%
Customer C [Member]
Segment Reporting Information [Line Items]
Entity-wide revenue, major customer, percentage	5.70%	27.20%

Share Repurchase Authorizatio_2

Share Repurchase Authorization - Textual (Details) - USD ($)	3 Months Ended
	Mar. 28, 2020	Mar. 14, 2019
Shares Repurchase Authorization [Line Items]
Amount available for future repurchase	$ 46,385,000
Stock repurchase, authorization termination date	Oct. 25, 2019
Maximum [Member]
Shares Repurchase Authorization [Line Items]
Stock repurchase, authorized amount		$ 80,000,000

Share Repurchase Authorizatio_3

Share Repurchase Authorization - Summary of Stock Repurchases (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 28, 2020	Mar. 31, 2019
Share Repurchase Program [Abstract]
Shares of common stock repurchased	1,250,000	30,000
Cost of shares repurchased	$ 33,614	$ 744
Average price paid per share	$ 26.89	$ 24.68