Intevac (IVAC) 10-Q 2 Nov 21 2021 Q3 Quarterly report Financial data

Cover Page

Cover Page - shares	9 Months Ended
	Oct. 02, 2021	Nov. 02, 2021
Cover [Abstract]
Document Type	10-Q
Amendment Flag	false
Entity Interactive Data Current	Yes
Document Period End Date	Oct. 2, 2021
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q3
Document Quarterly Report	true
Document Transition Report	false
Entity Registrant Name	INTEVAC, INC.
Entity Central Index Key	0001001902
Current Fiscal Year End Date	--01-01
Entity Current Reporting Status	Yes
Entity Filer Category	Accelerated Filer
Trading Symbol	IVAC
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity File Number	0-26946
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	94-3125814
Entity Address, Address Line One	3560 Bassett Street
Entity Address, City or Town	Santa Clara
Entity Address, State or Province	CA
Entity Address, Postal Zip Code	95054
City Area Code	408
Local Phone Number	986-9888
Entity Small Business	true
Title of 12(b) Security	Common Stock
Entity Common Stock, Shares Outstanding		24,590,904
Security Exchange Name	NASDAQ

CONDENSED CONSOLIDATED BALANCE

CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Oct. 02, 2021	Jan. 02, 2021
Current assets:
Cash and cash equivalents	$ 33,696	$ 29,341
Short-term investments	11,137	14,839
Trade and other accounts receivable, net of allowances of $0 at both October 2, 2021 and at January 2, 2021	13,470	28,646
Inventories	22,453	21,689
Prepaid expenses and other current assets	1,981	1,893
Total current assets	82,737	96,408
Long-term investments	5,825	5,388
Restricted cash	786	787
Property, plant and equipment, net	9,209	11,004
Operating lease right-of-use-assets	6,382	8,165
Deferred income taxes and other long-term assets	5,554	5,486
Total assets	110,493	127,238
Current liabilities:
Current operating lease liabilities	3,047	2,853
Accounts payable	4,659	4,259
Accrued payroll and related liabilities	5,657	7,679
Other accrued liabilities	2,649	3,631
Total current liabilities	16,012	18,422
Noncurrent liabilities:
Noncurrent operating lease liabilities	4,476	6,803
Other long-term liabilities	450	457
Total noncurrent liabilities	4,926	7,260
Stockholders' equity:
Common stock, $0.001 par value	25	24
Additional paid-in capital	198,117	193,173
Treasury stock, 5,087 shares at both October 2, 2021 and at January 2, 2021	(29,551)	(29,551)
Accumulated other comprehensive income	557	640
Accumulated deficit	(79,593)	(62,730)
Total stockholders' equity	89,555	101,556
Total liabilities and stockholders' equity	$ 110,493	$ 127,238

CONDENSED CONSOLIDATED BALANC_2

CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Oct. 02, 2021	Jan. 02, 2021
Statement of Financial Position [Abstract]
Net of allowances of trade, note and other accounts receivable	$ 0	$ 0
Common stock, par value	$ 0.001	$ 0.001
Treasury stock, shares	5,087	5,087

CONDENSED CONSOLIDATED STATEMEN

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 02, 2021	Sep. 26, 2020	Oct. 02, 2021	Sep. 26, 2020
Net revenues:
Total net revenues	$ 14,793	$ 21,565	$ 44,847	$ 69,248
Cost of net revenues:
Total cost of net revenues	9,266	12,265	33,158	40,372
Gross profit	5,527	9,300	11,689	28,876
Operating expenses:
Research and development	3,743	3,603	11,262	10,594
Selling, general and administrative	5,752	5,845	17,208	17,426
Total operating expenses	9,495	9,448	28,470	28,020
Income (loss) from operations	(3,968)	(148)	(16,781)	856
Interest income and other income (expense), net	25	8	75	212
Income (loss) before provision for income taxes	(3,943)	(140)	(16,706)	1,068
Provision for income taxes	290	217	157	1,125
Net loss	$ (4,233)	$ (357)	$ (16,863)	$ (57)
Net loss per share:
Basic and Diluted	$ (0.17)	$ (0.02)	$ (0.69)	$ 0
Weighted average common shares outstanding:
Basic and Diluted	24,522	23,771	24,265	23,605
Systems and components
Net revenues:
Total net revenues	$ 11,700	$ 15,027	$ 35,410	$ 51,589
Cost of net revenues:
Total cost of net revenues	7,120	8,389	25,708	29,969
Technology development
Net revenues:
Total net revenues	3,093	6,538	9,437	17,659
Cost of net revenues:
Total cost of net revenues	$ 2,146	$ 3,876	$ 7,450	$ 10,403

CONDENSED CONSOLIDATED STATEM_2

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 02, 2021	Sep. 26, 2020	Oct. 02, 2021	Sep. 26, 2020
Statement Of Income And Comprehensive Income [Abstract]
Net loss	$ (4,233)	$ (357)	$ (16,863)	$ (57)
Other comprehensive income (loss), before tax:
Change in unrealized net gain on available-for-sale investments	(7)	(24)	(36)	29
Foreign currency translation gains (losses)	(7)	124	(47)	49
Other comprehensive income (loss), before tax	(14)	100	(83)	78
Income tax (expense) benefit related to items in other comprehensive income (loss)	0	0	0	0
Other comprehensive income (loss), net of tax	(14)	100	(83)	78
Comprehensive income(loss)	$ (4,247)	$ (257)	$ (16,946)	$ 21

CONDENSED CONSOLIDATED STATEM_3

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Oct. 02, 2021	Sep. 26, 2020
Operating activities
Net loss	$ (16,863)	$ (57)
Adjustments to reconcile net loss to net cash and cash equivalents provided by (used in) operating activities:
Depreciation and amortization	2,568	2,645
Net amortization (accretion) of investment premiums and discounts	88	(9)
Equity-based compensation	2,872	2,186
Straight-line rent adjustment and amortization of lease incentives	(350)	(224)
Deferred income taxes	(36)	516
Changes in operating assets and liabilities	11,681	2,714
Total adjustments	16,823	7,828
Net cash and cash equivalents provided by (used in) operating activities	(40)	7,771
Investing activities
Purchases of investments	(13,214)	(17,071)
Proceeds from sales and maturities of investments	16,355	17,950
Purchases of leasehold improvements and equipment	(773)	(2,329)
Net cash and cash equivalents provided by (used in) investing activities	2,368	(1,450)
Financing activities
Net proceeds from issuance of common stock	2,618	1,865
Common stock repurchases	0	(393)
Taxes paid related to net share settlement	(545)	(364)
Net cash and cash equivalents provided by financing activities	2,073	1,108
Effect of exchange rate changes on cash	(47)	49
Net increase in cash, cash equivalents and restricted cash	4,354	7,478
Cash, cash equivalents and restricted cash at beginning of period	30,128	20,554
Cash, cash equivalents and restricted cash at end of period	34,482	28,032
Non-cash investing and financing activity
Additions to right-of-use-assets obtained from new operating lease liabilities	$ 0	$ 128

Description of Business and Bas

Description of Business and Basis of Presentation	9 Months Ended
	Oct. 02, 2021
Accounting Policies [Abstract]
Description of Business and Basis of Presentation	1. Description of Business and Basis of Presentation Description of Business Intevac, Inc. (together with its subsidiaries “Intevac,” the “Company” or “we”) is a provider of vacuum deposition equipment for a wide variety of thin-film applications, and a leading provider of digital night-vision technologies and products to the defense industry. The Company leverages its core capabilities in high-volume manufacturing of small substrates to provide process manufacturing equipment solutions to the hard disk drive (“HDD”), display cover panel (“DCP”), photovoltaic (“PV”) solar cell and advanced semiconductor packaging (“ASP”) industries. Intevac also provides sensors, cameras and systems for government applications such as night vision. Intevac’s customers include manufacturers of hard disk media, DCPs and solar cells as well as the U.S. government and its agencies, allies and contractors. Intevac reports two segments: Thin-film Equipment (“TFE”) and Photonics. Basis of Presentation In the opinion of management, the unaudited interim condensed consolidated financial statements of Intevac included herein have been prepared on a basis consistent with the January 2, 2021 audited consolidated financial statements and include all material adjustments, consisting of normal recurring adjustments, necessary to fairly present the information set forth therein. Intevac’s results of operations for the three and nine months ended October 2, 2021 are not necessarily indicative of future operating results. The preparation of consolidated financial statements in conformity with accounting principles generally accepted in the United States of America requires management to make judgments, estimates and assumptions that affect the amounts reported in the consolidated financial statements and accompanying notes. Actual results could differ materially from those estimates. COVID-19 The COVID-19 COVID-19, COVID-19 COVID-19 COVID-19

Revenue

Revenue	9 Months Ended
	Oct. 02, 2021
Revenue from Contract with Customer [Abstract]
Revenue	2. Revenue The following tables represent a disaggregation of revenue from contracts with customers for the three and nine months ended October 2, 2021 and September 26, 2020 along with the reportable segment for each category. Major Products and Service Lines TFE Three Months Ended October 2, 2021 Three Months Ended September 26, 2020 (In thousands) HDD DCP PV ASP Total HDD PV Total Systems, upgrades and spare parts $ 6,495 $ — $ 61 $ — $ 6,556 $ 7,601 $ 131 $ 7,732 Field service 1,424 — 18 — 1,442 1,635 — 1,635 Total TFE net revenues $ 7,919 $ — $ 79 $ — $ 7,998 $ 9,236 $ 131 $ 9,367 Nine Months Ended October 2, 2021 Nine Months Ended September 26, 2020 (In thousands) HDD DCP PV ASP Total HDD PV Total Systems, upgrades and spare parts $ 14,034 $ 3 $ 219 $ 3,850 $ 18,106 $ 29,189 $ 400 $ 29,589 Field service 4,425 14 60 — 4,499 4,334 2 4,336 Total TFE net revenues $ 18,459 $ 17 $ 279 $ 3,850 $ 22,605 $ 33,523 $ 402 $ 33,925 Three Months Ended Nine Months Ended Photonics October 2, 2021 September 26, 2020 October 2, 2021 September 26, 2020 (In thousands) Products: Military products $ 3,343 $ 4,947 $ 11,552 $ 15,758 Commercial products 100 139 278 257 Repair and other services 259 574 975 1,649 Total Photonics product net revenues 3,702 5,660 12,805 17,664 Technology development: Firm Fixed Price (“FFP”) 1,571 5,482 4,919 15,374 Cost Plus Fixed Fee (“CPFF”) 1,522 1,056 4,518 2,285 Total technology development net revenues 3,093 6,538 9,437 17,659 Total Photonics net revenues $ 6,795 $ 12,198 $ 22,242 $ 35,323 Primary Geographical Markets Three Months Ended Three Months Ended October 2, 2021 September 26, 2020 (In thousands) TFE Photonics Total TFE Photonics Total United States $ 220 $ 6,738 $ 6,958 $ 1,764 $ 12,079 $ 13,843 Asia 7,778 — 7,778 7,536 — 7,536 Europe — 57 57 67 119 186 Total net revenues $ 7,998 $ 6,795 $ 14,793 $ 9,367 $ 12,198 $ 21,565 Nine Months Ended Nine Months Ended October 2, 2021 September 26, 2020 (In thousands) TFE Photonics Total TFE Photonics Total United States $ 2,708 $ 22,069 $ 24,777 $ 2,596 $ 35,060 $ 37,656 Asia 16,047 — 16,047 31,262 — 31,262 Europe 3,850 173 4,023 67 263 330 Total net revenues $ 22,605 $ 22,242 $ 44,847 $ 33,925 $ 35,323 $ 69,248 Timing of Revenue Recognition Three Months Ended Three Months Ended October 2, 2021 September 26, 2020 (In thousands) TFE Photonics Total TFE Photonics Total Products transferred at a point in time $ 7,998 $ 259 $ 8,257 $ 9,367 $ 574 $ 9,941 Products and services transferred over time — 6,536 6,536 — 11,624 11,624 $ 7,998 $ 6,795 $ 14,793 $ 9,367 $ 12,198 $ 21,565 Nine Months Ended Nine Months Ended October 2, 2021 September 26, 2020 (In thousands) TFE Photonics Total TFE Photonics Total Products transferred at a point in time $ 22,605 $ 574 $ 23,179 $ 33,925 $ 1,649 $ 35,574 Products and services transferred over time — 21,668 21,668 — 33,674 33,674 $ 22,605 $ 22,242 $ 44,847 $ 33,925 $ 35,323 $ 69,248 The following table reflects the changes in our contract assets, which we classify as accounts receivable, unbilled or retainage, and our contract liabilities, which we classify as deferred revenue and customer advances, for the nine months ended October 2, 2021: October 2, 2021 January 2, 2021 Nine Months Change (In thousands) TFE: Contract assets: Accounts receivable, unbilled $ — $ 369 $ (369 ) Contract liabilities: Deferred revenue $ 197 $ 482 $ (285 ) Customer advances 24 33 (9 ) $ 221 $ 515 $ (294 ) Photonics: Contract assets: Accounts receivable, unbilled $ 1,493 $ 5,439 $ (3,946 ) Retainage 87 126 (39 ) $ 1,580 $ 5,565 $ (3,985 ) Contract liabilities: Deferred revenue $ 550 $ 779 $ (229 ) Accounts receivable, unbilled in our TFE segment represents a contract asset for revenue that has been recognized in advance of billing the customer. For our system and certain upgrade sales, our TFE customers generally pay in three installments, with a portion of the system price billed upon receipt of an order, a portion of the price billed upon shipment, and the balance of the price due upon completion of installation and acceptance of the system at the customer’s factory. Accounts receivable, unbilled in our TFE segment generally represents the balance of the system price that is due upon completion of installation and acceptance, less the amount that has been deferred as revenue for the performance of the installation tasks. During the nine months ended October 2, 2021, contract assets in our TFE segment decreased by $369,000 primarily due to the recognition of revenue for the installation portion of revenue for one system that completed installation and acceptance. Customer advances in our TFE segment generally represent a contract liability for amounts billed to the customer prior to transferring goods. The Company has elected to use the practical expedient to disregard the effect of the time value of money in a significant financing component when its payment terms are less than one year. These contract advances are liquidated when revenue is recognized. Deferred revenue in our TFE segment generally represents a contract liability for amounts billed to a customer for completed systems at the customer site that are undergoing installation and acceptance testing where transfer of control has not yet occurred, as Intevac does not yet have a demonstrated history of meeting the acceptance criteria upon the customer’s receipt of product. During the nine months ended October 2, 2021, we recognized revenue in our TFE segment of $33,000 and $296,000 that was included in customer advances and deferred revenue, respectively, at the beginning of the period. Accounts receivable, unbilled in our Photonics segment represents a contract asset for revenue that has been recognized in advance of billing the customer, which is common for contracts in the defense industry. In our Photonics segment, amounts are billed as work progresses in accordance with agreed-upon contractual terms, either at periodic intervals (e.g., monthly) or upon achievement of contractual milestones. Generally, billing occurs subsequent to revenue recognition, resulting in contract assets. Our contracts with the U.S. government may also contain retainage provisions. Retainage represents a contract asset for the portion of the contract price earned by us for work performed but held for payment by the U.S. government as a form of security until satisfactory completion of the contract. The retainage is billable upon completion of the contract performance and approval of final indirect expense rates by the government. During the nine months ended October 2, 2021, contract assets in our Photonics segment decreased by $4.0 million primarily due to the billing of contractual milestones, offset in part by the accrual of revenue for incurred costs under FFP and CPFF contracts. Deferred revenue in our Photonics segment generally represents a contract liability for amounts billed to the customer upon achievement of contractual milestones. These amounts are liquidated when revenue is recognized. During the nine months ended October 2, 2021, we recognized revenue in our Photonics segment of $779,000 that was included in deferred revenue at the beginning of the period. On October 2, 2021, we had $44.9 million of remaining performance obligations, which we also refer to as backlog. Backlog at October 2, 2021 consisted of $16.9 million of TFE backlog and $27.9 million of Photonics backlog. We expect to recognize approximately 38% of our remaining performance obligations as revenue in 2021, 40% in 2022, 21% in 2023 and 1% in 2024.

Inventories

Inventories	9 Months Ended
	Oct. 02, 2021
Inventory Disclosure [Abstract]
Inventories	3. Inventories Inventories are stated at the lower of average cost or net realizable value and consist of the following: October 2, January 2, 2021 2021 (In thousands) Raw materials $ 11,262 $ 9,999 Work-in-progress 6,929 4,832 Finished goods 4,262 6,858 $ 22,453 $ 21,689 Finished goods inventory at October 2, 2021 included one VERTEX SPECTRA system for DCP at a customer’s factory previously under evaluation for which the evaluation period has ended but the tool is being considered for another application at that site. Finished goods inventory at January 2, 2021 included one VERTEX SPECTRA system for DCP under evaluation at a customer’s factory and one MATRIX PVD system for advanced semiconductor packaging under evaluation at a customer’s factory.

Equity-Based Compensation

Equity-Based Compensation	9 Months Ended
	Oct. 02, 2021
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Equity-Based Compensation	4. Equity-Based Compensation At October 2, 2021, Intevac had equity-based awards outstanding under the 2020 Equity Incentive Plan and the 2012 Equity Incentive Plan (together, the “Plans”) and the 2003 Employee Stock Purchase Plan (the “ESPP”). Intevac’s stockholders approved all of these plans. The Plans permit the grant of incentive or non-statutory The ESPP provides that eligible employees may purchase Intevac’s common stock through payroll deductions at a price equal to 85% of the lower of the fair market value at the entry date of the applicable offering period or at the end of each applicable purchase interval. Offering periods are generally two years in length, and consist of a series of six-month six-month Equity-based Compensation Expense The effect of recording equity-based compensation for the three and nine months ended October 2, 2021 and September 26, 2020 was as follows: Three Months Ended Nine Months Ended October 2, 2021 September 26, 2020 October 2, 2021 September 26, 2020 (In thousands) Equity-based compensation by type of award: Stock options $ 27 $ 47 $ 159 $ 411 RSUs 673 495 1,872 1,311 ESPP awards 185 316 841 464 Total equity-based compensation $ 885 $ 858 $ 2,872 $ 2,186 Stock Options and ESPP The fair value of stock options and ESPP awards is estimated at the grant date using the Black-Scholes option valuation model. The determination of fair value of stock options and ESPP awards on the date of grant using an option-pricing model is affected by Intevac’s stock price as well as assumptions regarding a number of highly complex and subjective variables. These variables include, but are not limited to, our expected stock price volatility over the term of the awards and actual employee stock option exercise behavior. Intevac accounts for forfeitures as they occur, rather than estimating expected forfeitures. Option activity as of October 2, 2021 and changes during the nine months ended October 2, 2021 were as follows: Shares Weighted-Average Exercise Price Options outstanding at January 2, 2021 1,814,467 $ 6.66 Options granted — $ — Options cancelled and forfeited (211,042 ) $ 7.47 Options exercised (73,744 ) $ 5.89 Options outstanding at October 2, 2021 1,529,681 $ 6.57 Options exercisable at October 2, 2021 1,317,356 $ 6.78 Intevac issued 434,054 shares of common stock under the ESPP during the nine months ended October 2, 2021. Intevac estimated the weighted-average fair value of stock options and employee stock purchase rights using the following weighted-average assumptions: Three Months Ended Nine Months Ended October 2, September 26, October 2, September 26, Stock Options: Weighted-average fair value of grants per share $ — $ — $ — $ 1.82 Expected volatility — — — 46.04 % Risk-free interest rate — — — 0.44 % Expected term of options (in years) — — — 4.39 Dividend yield — — — None Three Months Ended Nine Months Ended October 2, September 26, October 2, September 26, Stock Purchase Rights: Weighted-average fair value of grants per share $ 2.43 $ 2.20 $ 2.59 $ 2.20 Expected volatility 64.94 % 51.72 % 60.88 % 51.49 % Risk-free interest rate 0.07 % 0.12 % 0.08 % 0.14 % Expected term of purchase rights (in years) 0.75 1.26 0.91 1.24 Dividend yield None None None None The computation of the expected volatility assumptions used in the Black-Scholes calculations for new stock option grants and ESPP purchase rights is based on the historical volatility of Intevac’s stock price, measured over a period equal to the expected term of the stock option grant or purchase right. The risk-free interest rate is based on the yield available on U.S. Treasury Strips with an equivalent remaining term. The expected term of employee stock options represents the weighted-average period that the stock options are expected to remain outstanding and was determined based on historical experience of similar awards, giving consideration to the contractual terms of the equity-based awards and vesting schedules. The expected term of purchase rights represents the period of time remaining in the current offering period. The dividend yield assumption is based on Intevac’s history of not paying dividends and the assumption of not paying dividends in the future. RSUs RSU activity as of October 2, 2021 and changes during the nine months ended October 2, 2021 were as follows: Shares Weighted-Average Grant Date Fair Value Non-vested 901,634 $ 5.30 Granted 590,931 $ 6.18 Vested (301,305 ) $ 6.07 Cancelled and forfeited (82,529 ) $ 4.66 Non-vested 1,108,731 $ 5.60 Time-based RSUs are converted into shares of Intevac common stock upon vesting on a one-for-one In May 2021, we granted 126,320 performance-based restricted stock units (“PRSUs”) to members of our senior management. The number of PRSUs that will vest is determined by our common stock achieving a certain Total Shareholder Return (“TSR”) for the Company, relative to the TSR of a specified peer group over a measurement period of two years from the time of grant. The fair value of each PRSU award was estimated on the date of grant using a Monte Carlo simulation. PRSU activity is included in the above RSU tables. At the end of the performance measurement period, the Compensation Committee of the Board of Directors (the “Compensation Committee”) will determine the achievement against the performance objectives. Depending on the Company’s TSR relative to the peer group TSR, the actual number of shares that will be vested for each PRSU grant can range from zero to 200% of the initial grant. Intevac estimated the weighted-average fair value of PRSUs using the following weighted-average assumptions: Nine Months Ended October 2, 2021 Weighted-average fair value of grants per share $ 7.65 Expected volatility 56.26 % Risk-free interest rate 0.15 % Dividend yield None In May 2020, we granted 109,465 PRSUs to members of our senior management. The PRSUs were issued collectively in four separate tranches with individual one-year Intevac estimated the weighted-average fair value of PRSUs using the following weighted-average assumptions: Nine Months Ended September 26, 2020 Weighted-average fair value of grants per share $ 3.16 Expected volatility 46.7 % Risk-free interest rate 0.25 % Dividend yield None

Warranty

Warranty	9 Months Ended
	Oct. 02, 2021
Guarantees [Abstract]
Warranty	5. Warranty Intevac provides for the estimated cost of warranty when revenue is recognized. Intevac’s warranty is subject to contract terms and, for its HDD manufacturing, DCP manufacturing, solar cell manufacturing and advanced semiconductor packaging manufacturing systems, the warranty typically ranges between 12 and 24 months from customer acceptance. During this warranty period any defective non-consumable On the condensed consolidated balance sheets, the short-term portion of the warranty provision is included in other accrued liabilities, while the long-term portion is included in other long-term liabilities. The expense associated with product warranties issued or adjusted is included in cost of net revenues on the condensed consolidated statements of operations. The following table displays the activity in the warranty provision account for the three and nine months ended October 2, 2021 and September 26, 2020: Three Months Ended Nine Months Ended October 2, 2021 September 26, 2020 October 2, 2021 September 26, 2020 (In thousands) Opening balance $ 572 $ 662 $ 480 $ 1,022 Expenditures incurred under warranties (148 ) (89 ) (564 ) (398 ) Accruals for product warranties issued during the reporting period 80 39 553 198 Adjustments to previously existing warranty accruals 106 (57 ) 141 (267 ) Closing balance $ 610 $ 555 $ 610 $ 555 The following table displays the balance sheet classification of the warranty provision account at October 2, 2021 and at January 2, 2021: October 2, 2021 January 2, 2021 (In thousands) Other accrued liabilities $ 542 $ 405 Other long-term liabilities 68 75 Total warranty provision $ 610 $ 480

Guarantees

Guarantees	9 Months Ended
	Oct. 02, 2021
Guarantees [Abstract]
Guarantees	6. Guarantees Officer and Director Indemnifications As permitted or required under Delaware law and to the maximum extent allowable under that law, Intevac has certain obligations to indemnify its current and former officers and directors for certain events or occurrences while the officer or director is, or was, serving at Intevac’s request in such capacity. These indemnification obligations are valid as long as the director or officer acted in good faith and in a manner the person reasonably believed to be in or not opposed to the best interests of the Company and, with respect to any criminal action or proceeding, had no reasonable cause to believe his or her conduct was unlawful. The maximum potential amount of future payments Intevac could be required to make under these indemnification obligations is unlimited; however, Intevac has a director and officer insurance policy that mitigates Intevac’s exposure and enables Intevac to recover a portion of any future amounts paid. As a result of Intevac’s insurance policy coverage, Intevac believes the estimated fair value of these indemnification obligations is not material. Other Indemnifications As is customary in Intevac’s industry, many of Intevac’s contracts provide remedies to certain third parties such as defense, settlement, or payment of judgments for intellectual property claims related to the use of its products. Such indemnification obligations may not be subject to maximum loss clauses. Historically, payments made related to these indemnifications have been immaterial. Letters of Credit As of October 2, 2021, we had letters of credit and bank guarantees outstanding totaling $786,000, including the standby letter of credit outstanding under the Santa Clara, California facility lease and various other guarantees with our bank. These letters of credit and bank guarantees are collateralized by $786,000 of restricted cash.

Cash, Cash Equivalents and Inve

Cash, Cash Equivalents and Investments	9 Months Ended
	Oct. 02, 2021
Investments Debt And Equity Securities [Abstract]
Cash, Cash Equivalents and Investments	7. Cash, Cash Equivalents and Investments Cash and cash equivalents, short-term investments and long-term investments consist of: October 2, 2021 Amortized Cost Unrealized Gains Unrealized Losses Fair Value (In thousands) Cash and cash equivalents: Cash $ 28,749 $ — $ — $ 28,749 Money market funds 4,447 — — 4,447 Municipal bonds 500 — — 500 Total cash and cash equivalents $ 33,696 $ — $ — $ 33,696 Short-term investments: Certificates of deposit $ 6,299 $ 3 $ — $ 6,302 Commercial paper 400 — — 400 Corporate bonds and medium-term notes 2,919 1 — 2,920 Municipal bonds 515 — — 515 U.S. treasury and agency securities 1,000 — — 1,000 Total short-term investments $ 11,133 $ 4 $ — $ 11,137 Long-term investments: Asset backed securities $ 480 $ — $ — $ 480 Certificates of deposit 500 — 1 499 Corporate bonds and medium-term notes 2,541 1 1 2,541 Municipal bonds 145 — 1 144 U.S. treasury and agency securities 2,161 — — 2,161 Total long-term investments $ 5,827 $ 1 $ 3 $ 5,825 Total cash, cash equivalents, and investments $ 50,656 $ 5 $ 3 $ 50,658 January 2, 2021 Amortized Cost Unrealized Unrealized Fair Value (In thousands) Cash and cash equivalents: Cash $ 24,729 $ — $ — $ 24,729 Money market funds 3,612 — — 3,612 Certificates of deposit 1,000 — — 1,000 Total cash and cash equivalents $ 29,341 $ — $ — $ 29,341 Short-term investments: Certificates of deposit $ 6,450 $ 2 $ — $ 6,452 Commercial paper 500 — — 500 Corporate bonds and medium-term notes 2,929 6 — 2,935 Municipal bonds 400 — — 400 U.S. treasury and agency securities 4,527 25 — 4,552 Total short-term investments $ 14,806 $ 33 $ — $ 14,839 Long-term investments: Certificates of deposit $ 500 $ — $ — $ 500 Corporate bonds and medium-term notes 3,474 4 — 3,478 U.S. treasury and agency securities 1,409 1 — 1,410 Total long-term investments $ 5,383 $ 5 $ — $ 5,388 Total cash, cash equivalents, and investments $ 49,530 $ 38 $ — $ 49,568 The contractual maturities of available-for-sale October 2, 2021 Amortized Cost Fair Value (In thousands) Due in one year or less $ 16,080 $ 16,084 Due after one through three years 5,827 5,825 $ 21,907 $ 21,909 The following table provides the fair market value of Intevac’s investments with unrealized losses that are not deemed to be other-than temporarily impaired as of October 2, 2021. October 2, 2021 In Loss Position for Less than 12 Months In Loss Position for Greater than 12 Months Fair Value Gross Unrealized Losses Fair Value Gross Unrealized (In thousands) Certificates of deposit $ 499 $ 1 $ — $ — Corporate bonds and medium-term notes 1,944 1 — — Municipal bond 145 1 — — $ 2,588 $ 3 $ — $ — All prices for the fixed maturity securities including U.S. Treasury and agency securities, certificates of deposit, commercial paper, corporate bonds and municipal bonds are received from independent pricing services utilized by Intevac’s outside investment manager. This investment manager performs a review of the pricing methodologies and inputs utilized by the independent pricing services for each asset type priced by the vendor. In addition, on at least an annual basis, the investment manager conducts due diligence visits and interviews with each pricing vendor to verify the inputs utilized for each asset class. The due diligence visits include a review of the procedures performed by each vendor to ensure that pricing evaluations are representative of the price that would be received for a security in an orderly sale. Any pricing where the input is based solely on a broker price is deemed to be a Level 3 price. Intevac uses the pricing data obtained from its outside investment manager as the primary input to make its assessments and determinations as to the ultimate valuation of the above-mentioned securities and has not made, during the periods presented, any material adjustments to such inputs. The following table represents the fair value hierarchy of Intevac’s available-for-sale Fair Value Measurements at October 2, 2021 Total Level 1 Level 2 (In thousands) Recurring fair value measurements: Available-for-sale Money market funds $ 4,447 $ 4,447 $ — U.S. treasury and agency securities 3,161 3,161 — Asset backed securities 480 — 480 Certificates of deposit 6,801 — 6,801 Commercial paper 400 — 400 Corporate bonds and medium-term notes 5,461 — 5,461 Municipal bonds 1,159 — 1,159 Total recurring fair value measurements $ 21,909 $ 7,608 $ 14,301

Derivative Instruments

Derivative Instruments	9 Months Ended
	Oct. 02, 2021
Derivative Instrument Detail [Abstract]
Derivative Instruments	8. Derivative Instruments The Company uses foreign currency forward contracts to mitigate variability in gains and losses generated from the re-measurement re-measurement The following table summarizes the Company’s outstanding derivative instruments on a gross basis as recorded in its condensed consolidated balance sheets as of October 2, 2021 and January 2, 2021: Notional Amounts Derivative Liabilities Derivative Instrument October 2 2021 January 2, 2021 October 2, 2021 January 2, 2021 Balance Sheet Line Fair Value Balance Sheet Line Fair Value (In thousands) Undesignated Hedges: Forward Foreign Currency Contracts $ 811 $ 983 (a ) $ 2 (a ) $ 3 Total Hedges $ 811 $ 983 $ 2 $ 3 (a) Other accrued liabilities

Equity

Equity	9 Months Ended
	Oct. 02, 2021
Equity [Abstract]
Equity	9. Equity Condensed Consolidated Statement of Changes in Equity The changes in stockholders’ equity by component for the three and nine months ended October 2, 2021 and September 26, 2020, are as follows (in thousands): Three months ended October 2, 2021 Common Paid-in Treasury Accumulated Accumulated Total Balance at July 3, 2021 $ 196,088 $ (29,551 ) $ 571 $ (75,360 ) $ 91,748 Common stock issued under employee plans 1,182 — — — 1,182 Shares withheld for net share settlement of RSUs (13 ) — — — (13 ) Equity-based compensation expense 885 — — — 885 Net loss — — — (4,233 ) (4,233 ) Other comprehensive loss — — (14 ) — (14 ) Balance at October 2, 2021 $ 198,142 $ (29,551 ) $ 557 $ (79,593 ) $ 89,555 Nine months ended October 2, 2021 Common Paid-in Treasury Accumulated Accumulated Total Balance at January 2, 2021 $ 193,197 $ (29,551 ) $ 640 $ (62,730 ) $ 101,556 Common stock issued under employee plans 2,618 — — — 2,618 Shares withheld for net share settlement of RSUs (545 ) — — — (545 ) Equity-based compensation expense 2,872 — — — 2,872 Net loss — — — (16,863 ) (16,863 ) Other comprehensive loss — — (83 ) — (83 ) Balance at October 2, 2021 $ 198,142 $ (29,551 ) $ 557 $ (79,593 ) $ 89,555 Three months ended September 26, 2020 Common Paid-in Treasury Accumulated Accumulated Total Balance at June 27, 2020 $ 190,290 $ (29,551 ) $ 402 $ (63,486 ) $ 97,655 Common stock issued under employee plans 871 — — — 871 Shares withheld for net share settlement of RSUs (19 ) — — — (19 ) Equity-based compensation expense 858 — — — 858 Net loss — — — (357 ) (357 ) Other comprehensive income — — 100 — 100 Balance at September 26, 2020 $ 192,000 $ (29,551 ) $ 502 $ (63,843 ) $ 99,108 Nine months ended September 26, 2020 Common Paid-in Treasury Accumulated Accumulated Total Balance at December 28, 2019 $ 188,313 $ (29,158 ) $ 424 $ (63,786 ) $ 95,793 Common stock issued under employee plans 1,865 — — — 1,865 Shares withheld for net share settlement of RSUs (364 ) — — — (364 ) Equity-based compensation expense 2,186 — — — 2,186 Net loss — — — (57 ) (57 ) Other comprehensive income — — 78 — 78 Common stock repurchases — (393 ) — — (393 ) Balance at September 26, 2020 $ 192,000 $ (29,551 ) $ 502 $ (63,843 ) $ 99,108 Accumulated Other Comprehensive Income The changes in accumulated other comprehensive income by component for the three and nine months ended October 2, 2021 and September 26, 2020, are as follows. Three Months Ended Nine Months Ended October 2, 2021 Foreign currency Unrealized available-for-sale Total Foreign Unrealized available-for-sale Total (In thousands) Beginning balance $ 562 $ 9 $ 571 $ 602 $ 38 $ 640 Other comprehensive loss before reclassification (7 ) (7 ) (14 ) (47 ) (36 ) (83 ) Amounts reclassified from other comprehensive income (loss) — — — — — — Net current-period other comprehensive loss (7 ) (7 ) (14 ) (47 ) (36 ) (83 ) Ending balance $ 555 $ 2 $ 557 $ 555 $ 2 $ 557 Three Months Ended Nine Months Ended September 26, 2020 Foreign currency Unrealized available-for-sale Total Foreign Unrealized available-for-sale Total (In thousands) Beginning balance $ 306 $ 96 $ 402 $ 381 $ 43 $ 424 Other comprehensive income (loss) before reclassification 124 (24 ) 100 49 29 78 Amounts reclassified from other comprehensive income (loss) — — — — — — Net current-period other comprehensive income 124 (24 ) 100 49 29 78 Ending balance $ 430 $ 72 $ 502 $ 430 $ 72 $ 502 Stock Repurchase Program On November 21, 2013, Intevac’s Board of Directors approved a stock repurchase program authorizing up to $30.0 million in repurchases. On August 15, 2018, Intevac’s Board of Directors approved a $10.0 million increase to the original stock repurchase program for an aggregate authorized amount of up to $40.0 million. At October 2, 2021, $10.4 million remains available for future stock repurchases under the repurchase program. The following table summarizes Intevac’s stock repurchases: Three Months Ended Nine Months Ended October 2, 2021 September 26, 2020 October 2, 2021 September 26, 2020 (In thousands, except per share amounts) Shares of common stock repurchased — — — 98 Cost of stock repurchased $ — $ — $ — $ 393 Average price paid per share $ — $ — $ — $ 3.97 Intevac records treasury stock purchases under the cost method using the first-in, first-out paid-in paid-in

Net Loss Per Share

Net Loss Per Share	9 Months Ended
	Oct. 02, 2021
Earnings Per Share [Abstract]
Net Loss Per Share	10. Net Loss Per Share The following table sets forth the computation of basic and diluted net loss per share for the three and nine months ended October 2, 2021 and September 26, 2020: Three Months Ended Nine Months Ended October 2, 2021 September 26, 2020 October 2, 2021 September 26, 2020 (In thousands, except per share amounts) Net loss $ (4,233 ) $ (357 ) $ (16,863 ) $ (57 ) Weighted-average shares – basic 24,522 23,771 24,265 23,605 Effect of dilutive potential common shares — — — — Weighted-average shares – diluted 24,522 23,771 24,265 23,605 Net loss per share – basic $ (0.17 ) $ (0.02 ) $ (0.69 ) $ (0.00 ) Net loss per share –diluted $ (0.17 ) $ (0.02 ) $ (0.69 ) $ (0.00 ) As the Company is in a net loss position, all of the Company’s equity instruments are considered antidilutive.

Segment Reporting

Segment Reporting	9 Months Ended
	Oct. 02, 2021
Segment Reporting [Abstract]
Segment Reporting	11. Segment Reporting Intevac’s two reportable segments are TFE and Photonics. Intevac’s chief operating decision-maker has been identified as the President and CEO, who reviews operating results to make decisions about allocating resources and assessing performance for the entire Company. Segment information is presented based upon Intevac’s management organization structure as of October 2, 2021 and the distinctive nature of each segment. Future changes to this internal financial structure may result in changes to the reportable segments disclosed. Each reportable segment is separately managed and has separate financial results that are reviewed by Intevac’s chief operating decision-maker. Each reportable segment contains closely related products that are unique to the particular segment. Segment operating profit is determined based upon internal performance measures used by the chief operating decision-maker. Intevac derives the segment results from its internal management reporting system. The accounting policies Intevac uses to derive reportable segment results are substantially the same as those used for external reporting purposes. Management measures the performance of each reportable segment based upon several metrics, including orders, net revenues and operating income. Management uses these results to evaluate the performance of, and to assign resources to, each of the reportable segments. Intevac manages certain operating expenses separately at the corporate level. Intevac allocates certain of these corporate expenses to the segments in an amount equal to 3% of net revenues. Segment operating income excludes interest income/expense and other financial charges and income taxes according to how a particular reportable segment’s management is measured. Management does not consider impairment charges, gains and losses on divestitures and sales of intellectual property, or unallocated costs in measuring the performance of the reportable segments. The TFE segment designs, develops and markets vacuum process equipment solutions for high-volume manufacturing of small substrates with precise thin-film properties, such as for the hard drive, solar cell, DCP and advanced semiconductor packaging industries, as well as other adjacent thin-film markets. The Photonics segment develops compact, cost-effective, high-sensitivity digital-optical products for the capture and display of low-light Information for each reportable segment for the three and nine months ended October 2, 2021 and September 26, 2020 is as follows: Net Revenues Three Months Ended Nine Months Ended October 2, 2021 September 26, 2020 October 2, 2021 September 26, 2020 (In thousands) TFE $ 7,998 $ 9,367 $ 22,605 $ 33,925 Photonics 6,795 12,198 22,242 35,323 Total segment net revenues $ 14,793 $ 21,565 $ 44,847 $ 69,248 Operating Income (Loss) Three Months Ended Nine Months Ended October 2, 2021 September 26, 2020 October 2, 2021 September 26, 2020 (In thousands) TFE $ (1,841 ) $ (1,661 ) $ (10,148 ) $ (4,366 ) Photonics (341 ) 3,032 (1,742 ) 9,480 Total segment operating income (loss) (2,182 ) 1,371 (11,890 ) 5,114 Unallocated costs (1,786 ) (1,519 ) (4,891 ) (4,258 ) Income (loss) from operations (3,968 ) (148 ) (16,781 ) 856 Interest income and other income (expense), net 25 8 75 212 Income (loss) before provision for income taxes $ (3,943 ) $ (140 ) $ (16,706 ) $ 1,068 Total assets for each reportable segment as of October 2, 2021 and January 2, 2021 are as follows: Assets October 2, 2021 January 2, 2021 (In thousands) TFE $ 33,411 $ 44,335 Photonics 16,810 22,923 Total segment assets 50,221 67,258 Cash, cash equivalents and investments 50,658 49,568 Restricted cash 786 787 Deferred income taxes 5,371 5,335 Other current assets 907 1,093 Common property, plant and equipment 1,100 1,443 Common operating lease right-of-use 1,267 1,603 Other assets 183 151 Consolidated total assets $ 110,493 $ 127,238

Income Taxes

Income Taxes	9 Months Ended
	Oct. 02, 2021
Income Tax Disclosure [Abstract]
Income Taxes	12. Income Taxes Intevac recorded income tax provisions of $290,000 and $157,000 for the three and nine months ended October 2, 2021, respectively, and income tax provisions of $217,000 and $1.1 million for the three and nine months ended September 26, 2020, respectively. The income tax provisions for these three and nine month periods are based upon estimates of annual income (loss), annual permanent differences and statutory tax rates in the various jurisdictions in which Intevac operates. For the three months ended October 2, 2021 Intevac recorded an income tax provision on earnings of its international subsidiaries of $179,000. For the nine months ended October 2, 2021 Intevac recorded an income tax benefit of $29,000 on losses of its international subsidiaries. For the three and nine months ended October 2, 2021 Intevac recorded $111,000 and $183,000, respectively, for withholding taxes on royalties paid into the United States from Intevac’s Singapore subsidiary as discrete items. For the three and nine month periods ended September 26, 2020 Intevac recorded income tax provisions on earnings of its international subsidiaries of $111,000 and $659,000, respectively, and recorded $98,000 and $471,000, respectively, for withholding taxes on royalties paid into the United States from Intevac’s Singapore subsidiary as discrete items. For all periods presented Intevac utilized net operating loss carry-forwards to offset the impact of global intangible low-taxed The Coronavirus Aid, Relief, and Economic Security Act (“CARES Act”) was enacted on March 27, 2020 in the United States. The CARES Act includes several significant provisions for corporations, including the usage of net operating losses and payroll benefits. Several foreign (non-U.S.) non-U.S. Under the CARES Act, we elected to defer payment, on an interest-free basis, of the employer portion of social security payroll taxes incurred from March 27, 2020 to December 31, 2020. One-half In Singapore, Intevac receives government assistance under the Job Support Scheme (“JSS”). The purpose of the JSS is to provide wage support to employers to help them retain their local employees. During the nine months ended October 2, 2021, the Company received $83,000 in JSS grants, of which $56,000 is reported as a reduction of cost of net revenues, $10,000 is reported as a reduction of research and development (“R&D”) expenses and $17,000 is reported as a reduction of selling, general and administrative expenses on the condensed consolidated statements of operations. During the quarter ended September 26, 2020, the Company received $124,000 in JSS grants, of which $72,000 is reported as a reduction of cost of net revenues, $20,000 is reported as a reduction of R&D expenses and $32,000 is reported as a reduction of selling, general and administrative expenses on the condensed consolidated statement of operations. During the nine months ended September 26, 2020, the Company received $434,000 in JSS grants, of which $252,000 is reported as a reduction of cost of net revenues, $68,000 is reported as a reduction of R&D expenses and $114,000 is reported as a reduction of selling, general and administrative expenses on the condensed consolidated statement of operations.

Restructuring Charges

Restructuring Charges	9 Months Ended
	Oct. 02, 2021
Restructuring and Related Activities [Abstract]
Restructuring Charges	13. Restructuring Charges During the third quarter of fiscal 2021, Intevac substantially completed implementation of the 2021 cost reduction plan (the “2021 Cost Reduction Plan”), which was intended to reduce expenses and reduce its workforce by 5.2 percent. The cost of implementing the 2021 Cost Reduction Plan was reported under cost of net revenues and operating expenses in the condensed consolidated statements of operations. Substantially all cash outlays in connection with the Cost Reduction Plan occurred in the first nine months of fiscal 2021. Implementation of the 2021 Cost Reduction Plan is expected to reduce salary, wages and other employee-related expenses by approximately $2.0 million on an annual basis. During the third quarter of fiscal 2020, Intevac substantially completed implementation of the 2020 cost reduction plan (the “2020 Cost Reduction Plan”), which was intended to reduce expenses and reduce its workforce by 1.0 percent. The cost of implementing the 2020 Cost Reduction Plan was reported under cost of net revenues and operating expenses in the condensed consolidated statements of operations. Substantially all cash outlays in connection with the 2020 Cost Reduction Plan occurred in the third quarter of fiscal 2020. Implementation of the 2020 Cost Reduction Plan is expected to reduce salary, wages and other employee-related expenses by approximately $864,000 on an annual basis. The changes in restructuring reserves, which resulted from cash-based severance payments and other employee-related costs, associated with the cost reduction plans for the three and nine months ended October 2, 2021 and September 26, 2020 were as follows. Three October 2, 2021 Nine October 2, 2021 Three and Months 26, 2020 (In thousands) Severance and other employee-related costs Beginning balance $ — $ — $ — Provision for restructuring reserves 276 319 103 Cash payments made (276 ) (319 ) (103 ) Ending balance $ — $ — $ —

Contingencies

Contingencies	9 Months Ended
	Oct. 02, 2021
Commitments and Contingencies Disclosure [Abstract]
Contingencies	14. Contingencies From time to time, Intevac may have certain contingent liabilities that arise in the ordinary course of its business activities. Intevac accounts for contingent liabilities when it is probable that future expenditures will be made and such expenditures can be reasonably estimated. In July 2020, a former contract employee who worked for us via a staffing agency filed an action against us under the Private Attorneys General Act in California state court alleging that the Company failed to provide rest and meal breaks, pay overtime and reimburse business expenses for non-exempt

Revenue (Tables)

Revenue (Tables)	9 Months Ended
	Oct. 02, 2021
Revenue from Contract with Customer [Abstract]
Disaggregation of Revenue from Contracts with Customers	The following tables represent a disaggregation of revenue from contracts with customers for the three and nine months ended October 2, 2021 and September 26, 2020 along with the reportable segment for each category. Major Products and Service Lines TFE Three Months Ended October 2, 2021 Three Months Ended September 26, 2020 (In thousands) HDD DCP PV ASP Total HDD PV Total Systems, upgrades and spare parts $ 6,495 $ — $ 61 $ — $ 6,556 $ 7,601 $ 131 $ 7,732 Field service 1,424 — 18 — 1,442 1,635 — 1,635 Total TFE net revenues $ 7,919 $ — $ 79 $ — $ 7,998 $ 9,236 $ 131 $ 9,367 Nine Months Ended October 2, 2021 Nine Months Ended September 26, 2020 (In thousands) HDD DCP PV ASP Total HDD PV Total Systems, upgrades and spare parts $ 14,034 $ 3 $ 219 $ 3,850 $ 18,106 $ 29,189 $ 400 $ 29,589 Field service 4,425 14 60 — 4,499 4,334 2 4,336 Total TFE net revenues $ 18,459 $ 17 $ 279 $ 3,850 $ 22,605 $ 33,523 $ 402 $ 33,925 Three Months Ended Nine Months Ended Photonics October 2, 2021 September 26, 2020 October 2, 2021 September 26, 2020 (In thousands) Products: Military products $ 3,343 $ 4,947 $ 11,552 $ 15,758 Commercial products 100 139 278 257 Repair and other services 259 574 975 1,649 Total Photonics product net revenues 3,702 5,660 12,805 17,664 Technology development: Firm Fixed Price (“FFP”) 1,571 5,482 4,919 15,374 Cost Plus Fixed Fee (“CPFF”) 1,522 1,056 4,518 2,285 Total technology development net revenues 3,093 6,538 9,437 17,659 Total Photonics net revenues $ 6,795 $ 12,198 $ 22,242 $ 35,323 Primary Geographical Markets Three Months Ended Three Months Ended October 2, 2021 September 26, 2020 (In thousands) TFE Photonics Total TFE Photonics Total United States $ 220 $ 6,738 $ 6,958 $ 1,764 $ 12,079 $ 13,843 Asia 7,778 — 7,778 7,536 — 7,536 Europe — 57 57 67 119 186 Total net revenues $ 7,998 $ 6,795 $ 14,793 $ 9,367 $ 12,198 $ 21,565 Nine Months Ended Nine Months Ended October 2, 2021 September 26, 2020 (In thousands) TFE Photonics Total TFE Photonics Total United States $ 2,708 $ 22,069 $ 24,777 $ 2,596 $ 35,060 $ 37,656 Asia 16,047 — 16,047 31,262 — 31,262 Europe 3,850 173 4,023 67 263 330 Total net revenues $ 22,605 $ 22,242 $ 44,847 $ 33,925 $ 35,323 $ 69,248 Timing of Revenue Recognition Three Months Ended Three Months Ended October 2, 2021 September 26, 2020 (In thousands) TFE Photonics Total TFE Photonics Total Products transferred at a point in time $ 7,998 $ 259 $ 8,257 $ 9,367 $ 574 $ 9,941 Products and services transferred over time — 6,536 6,536 — 11,624 11,624 $ 7,998 $ 6,795 $ 14,793 $ 9,367 $ 12,198 $ 21,565 Nine Months Ended Nine Months Ended October 2, 2021 September 26, 2020 (In thousands) TFE Photonics Total TFE Photonics Total Products transferred at a point in time $ 22,605 $ 574 $ 23,179 $ 33,925 $ 1,649 $ 35,574 Products and services transferred over time — 21,668 21,668 — 33,674 33,674 $ 22,605 $ 22,242 $ 44,847 $ 33,925 $ 35,323 $ 69,248
Changes in Contract Assets and Contract Liabilities	The following table reflects the changes in our contract assets, which we classify as accounts receivable, unbilled or retainage, and our contract liabilities, which we classify as deferred revenue and customer advances, for the nine months ended October 2, 2021: October 2, 2021 January 2, 2021 Nine Months Change (In thousands) TFE: Contract assets: Accounts receivable, unbilled $ — $ 369 $ (369 ) Contract liabilities: Deferred revenue $ 197 $ 482 $ (285 ) Customer advances 24 33 (9 ) $ 221 $ 515 $ (294 ) Photonics: Contract assets: Accounts receivable, unbilled $ 1,493 $ 5,439 $ (3,946 ) Retainage 87 126 (39 ) $ 1,580 $ 5,565 $ (3,985 ) Contract liabilities: Deferred revenue $ 550 $ 779 $ (229 )

Inventories (Tables)

Inventories (Tables)	9 Months Ended
	Oct. 02, 2021
Inventory Disclosure [Abstract]
Summary of Inventories	Inventories are stated at the lower of average cost or net realizable value and consist of the following: October 2, January 2, 2021 2021 (In thousands) Raw materials $ 11,262 $ 9,999 Work-in-progress 6,929 4,832 Finished goods 4,262 6,858 $ 22,453 $ 21,689

Equity-Based Compensation (Tabl

Equity-Based Compensation (Tables)	9 Months Ended
	Oct. 02, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Effect of Recording Equity-Based Compensation	The effect of recording equity-based compensation for the three and nine months ended October 2, 2021 and September 26, 2020 was as follows: Three Months Ended Nine Months Ended October 2, 2021 September 26, 2020 October 2, 2021 September 26, 2020 (In thousands) Equity-based compensation by type of award: Stock options $ 27 $ 47 $ 159 $ 411 RSUs 673 495 1,872 1,311 ESPP awards 185 316 841 464 Total equity-based compensation $ 885 $ 858 $ 2,872 $ 2,186
Summary of Stock Option Activity	Option activity as of October 2, 2021 and changes during the nine months ended October 2, 2021 were as follows: Shares Weighted-Average Exercise Price Options outstanding at January 2, 2021 1,814,467 $ 6.66 Options granted — $ — Options cancelled and forfeited (211,042 ) $ 7.47 Options exercised (73,744 ) $ 5.89 Options outstanding at October 2, 2021 1,529,681 $ 6.57 Options exercisable at October 2, 2021 1,317,356 $ 6.78
Employee Stock Options Weighted-Average Assumptions	Intevac estimated the weighted-average fair value of stock options and employee stock purchase rights using the following weighted-average assumptions: Three Months Ended Nine Months Ended October 2, September 26, October 2, September 26, Stock Options: Weighted-average fair value of grants per share $ — $ — $ — $ 1.82 Expected volatility — — — 46.04 % Risk-free interest rate — — — 0.44 % Expected term of options (in years) — — — 4.39 Dividend yield — — — None Three Months Ended Nine Months Ended October 2, September 26, October 2, September 26, Stock Purchase Rights: Weighted-average fair value of grants per share $ 2.43 $ 2.20 $ 2.59 $ 2.20 Expected volatility 64.94 % 51.72 % 60.88 % 51.49 % Risk-free interest rate 0.07 % 0.12 % 0.08 % 0.14 % Expected term of purchase rights (in years) 0.75 1.26 0.91 1.24 Dividend yield None None None None
Summary of Restricted Stock Units Activity	RSU activity as of October 2, 2021 and changes during the nine months ended October 2, 2021 were as follows: Shares Weighted-Average Grant Date Fair Value Non-vested 901,634 $ 5.30 Granted 590,931 $ 6.18 Vested (301,305 ) $ 6.07 Cancelled and forfeited (82,529 ) $ 4.66 Non-vested 1,108,731 $ 5.60
Employee Stock Purchase Rights Weighted-Average Assumptions	Intevac estimated the weighted-average fair value of PRSUs using the following weighted-average assumptions: Nine Months Ended October 2, 2021 Weighted-average fair value of grants per share $ 7.65 Expected volatility 56.26 % Risk-free interest rate 0.15 % Dividend yield None Intevac estimated the weighted-average fair value of PRSUs using the following weighted-average assumptions: Nine Months Ended September 26, 2020 Weighted-average fair value of grants per share $ 3.16 Expected volatility 46.7 % Risk-free interest rate 0.25 % Dividend yield None

Warranty (Tables)

Warranty (Tables)	9 Months Ended
	Oct. 02, 2021
Guarantees [Abstract]
Schedule of Product Warranty Liability	The following table displays the activity in the warranty provision account for the three and nine months ended October 2, 2021 and September 26, 2020: Three Months Ended Nine Months Ended October 2, 2021 September 26, 2020 October 2, 2021 September 26, 2020 (In thousands) Opening balance $ 572 $ 662 $ 480 $ 1,022 Expenditures incurred under warranties (148 ) (89 ) (564 ) (398 ) Accruals for product warranties issued during the reporting period 80 39 553 198 Adjustments to previously existing warranty accruals 106 (57 ) 141 (267 ) Closing balance $ 610 $ 555 $ 610 $ 555 The following table displays the balance sheet classification of the warranty provision account at October 2, 2021 and at January 2, 2021: October 2, 2021 January 2, 2021 (In thousands) Other accrued liabilities $ 542 $ 405 Other long-term liabilities 68 75 Total warranty provision $ 610 $ 480

Cash, Cash Equivalents and In_2

Cash, Cash Equivalents and Investments (Tables)	9 Months Ended
	Oct. 02, 2021
Investments, All Other Investments [Abstract]
Cash, Cash Equivalents and Short-Term Investments and Long-Term Investments	Cash and cash equivalents, short-term investments and long-term investments consist of: October 2, 2021 Amortized Cost Unrealized Gains Unrealized Losses Fair Value (In thousands) Cash and cash equivalents: Cash $ 28,749 $ — $ — $ 28,749 Money market funds 4,447 — — 4,447 Municipal bonds 500 — — 500 Total cash and cash equivalents $ 33,696 $ — $ — $ 33,696 Short-term investments: Certificates of deposit $ 6,299 $ 3 $ — $ 6,302 Commercial paper 400 — — 400 Corporate bonds and medium-term notes 2,919 1 — 2,920 Municipal bonds 515 — — 515 U.S. treasury and agency securities 1,000 — — 1,000 Total short-term investments $ 11,133 $ 4 $ — $ 11,137 Long-term investments: Asset backed securities $ 480 $ — $ — $ 480 Certificates of deposit 500 — 1 499 Corporate bonds and medium-term notes 2,541 1 1 2,541 Municipal bonds 145 — 1 144 U.S. treasury and agency securities 2,161 — — 2,161 Total long-term investments $ 5,827 $ 1 $ 3 $ 5,825 Total cash, cash equivalents, and investments $ 50,656 $ 5 $ 3 $ 50,658 January 2, 2021 Amortized Cost Unrealized Unrealized Fair Value (In thousands) Cash and cash equivalents: Cash $ 24,729 $ — $ — $ 24,729 Money market funds 3,612 — — 3,612 Certificates of deposit 1,000 — — 1,000 Total cash and cash equivalents $ 29,341 $ — $ — $ 29,341 Short-term investments: Certificates of deposit $ 6,450 $ 2 $ — $ 6,452 Commercial paper 500 — — 500 Corporate bonds and medium-term notes 2,929 6 — 2,935 Municipal bonds 400 — — 400 U.S. treasury and agency securities 4,527 25 — 4,552 Total short-term investments $ 14,806 $ 33 $ — $ 14,839 Long-term investments: Certificates of deposit $ 500 $ — $ — $ 500 Corporate bonds and medium-term notes 3,474 4 — 3,478 U.S. treasury and agency securities 1,409 1 — 1,410 Total long-term investments $ 5,383 $ 5 $ — $ 5,388 Total cash, cash equivalents, and investments $ 49,530 $ 38 $ — $ 49,568
Contractual Maturities of Available-for-Sale Securities	The contractual maturities of available-for-sale October 2, 2021 Amortized Cost Fair Value (In thousands) Due in one year or less $ 16,080 $ 16,084 Due after one through three years 5,827 5,825 $ 21,907 $ 21,909
Fair Market Value of Investments with Unrealized Losses Not Deemed to be Other-Than Temporarily Impaired	The following table provides the fair market value of Intevac’s investments with unrealized losses that are not deemed to be other-than temporarily impaired as of October 2, 2021. October 2, 2021 In Loss Position for Less than 12 Months In Loss Position for Greater than 12 Months Fair Value Gross Unrealized Losses Fair Value Gross Unrealized (In thousands) Certificates of deposit $ 499 $ 1 $ — $ — Corporate bonds and medium-term notes 1,944 1 — — Municipal bond 145 1 — — $ 2,588 $ 3 $ — $ —
Fair Value Hierarchy of Available-for-Sale Securities Measured at Fair Value on Recurring Basis	The following table represents the fair value hierarchy of Intevac’s available-for-sale Fair Value Measurements at October 2, 2021 Total Level 1 Level 2 (In thousands) Recurring fair value measurements: Available-for-sale Money market funds $ 4,447 $ 4,447 $ — U.S. treasury and agency securities 3,161 3,161 — Asset backed securities 480 — 480 Certificates of deposit 6,801 — 6,801 Commercial paper 400 — 400 Corporate bonds and medium-term notes 5,461 — 5,461 Municipal bonds 1,159 — 1,159 Total recurring fair value measurements $ 21,909 $ 7,608 $ 14,301

Derivative Instruments (Tables)

Derivative Instruments (Tables)	9 Months Ended
	Oct. 02, 2021
Derivative Instrument Detail [Abstract]
Summary of Outstanding Derivative Instruments on Gross Basis as Recorded in Consolidated Balance Sheets	The following table summarizes the Company’s outstanding derivative instruments on a gross basis as recorded in its condensed consolidated balance sheets as of October 2, 2021 and January 2, 2021: Notional Amounts Derivative Liabilities Derivative Instrument October 2 2021 January 2, 2021 October 2, 2021 January 2, 2021 Balance Sheet Line Fair Value Balance Sheet Line Fair Value (In thousands) Undesignated Hedges: Forward Foreign Currency Contracts $ 811 $ 983 (a ) $ 2 (a ) $ 3 Total Hedges $ 811 $ 983 $ 2 $ 3 (a) Other accrued liabilities

Equity (Tables)

Equity (Tables)	9 Months Ended
	Oct. 02, 2021
Equity [Abstract]
Schedule of Changes in Stockholders' Equity	The changes in stockholders’ equity by component for the three and nine months ended October 2, 2021 and September 26, 2020, are as follows (in thousands): Three months ended October 2, 2021 Common Paid-in Treasury Accumulated Accumulated Total Balance at July 3, 2021 $ 196,088 $ (29,551 ) $ 571 $ (75,360 ) $ 91,748 Common stock issued under employee plans 1,182 — — — 1,182 Shares withheld for net share settlement of RSUs (13 ) — — — (13 ) Equity-based compensation expense 885 — — — 885 Net loss — — — (4,233 ) (4,233 ) Other comprehensive loss — — (14 ) — (14 ) Balance at October 2, 2021 $ 198,142 $ (29,551 ) $ 557 $ (79,593 ) $ 89,555 Nine months ended October 2, 2021 Common Paid-in Treasury Accumulated Accumulated Total Balance at January 2, 2021 $ 193,197 $ (29,551 ) $ 640 $ (62,730 ) $ 101,556 Common stock issued under employee plans 2,618 — — — 2,618 Shares withheld for net share settlement of RSUs (545 ) — — — (545 ) Equity-based compensation expense 2,872 — — — 2,872 Net loss — — — (16,863 ) (16,863 ) Other comprehensive loss — — (83 ) — (83 ) Balance at October 2, 2021 $ 198,142 $ (29,551 ) $ 557 $ (79,593 ) $ 89,555 Three months ended September 26, 2020 Common Paid-in Treasury Accumulated Accumulated Total Balance at June 27, 2020 $ 190,290 $ (29,551 ) $ 402 $ (63,486 ) $ 97,655 Common stock issued under employee plans 871 — — — 871 Shares withheld for net share settlement of RSUs (19 ) — — — (19 ) Equity-based compensation expense 858 — — — 858 Net loss — — — (357 ) (357 ) Other comprehensive income — — 100 — 100 Balance at September 26, 2020 $ 192,000 $ (29,551 ) $ 502 $ (63,843 ) $ 99,108 Nine months ended September 26, 2020 Common Paid-in Treasury Accumulated Accumulated Total Balance at December 28, 2019 $ 188,313 $ (29,158 ) $ 424 $ (63,786 ) $ 95,793 Common stock issued under employee plans 1,865 — — — 1,865 Shares withheld for net share settlement of RSUs (364 ) — — — (364 ) Equity-based compensation expense 2,186 — — — 2,186 Net loss — — — (57 ) (57 ) Other comprehensive income — — 78 — 78 Common stock repurchases — (393 ) — — (393 ) Balance at September 26, 2020 $ 192,000 $ (29,551 ) $ 502 $ (63,843 ) $ 99,108
Changes in Accumulated Other Comprehensive Income by Component	The changes in accumulated other comprehensive income by component for the three and nine months ended October 2, 2021 and September 26, 2020, are as follows. Three Months Ended Nine Months Ended October 2, 2021 Foreign currency Unrealized available-for-sale Total Foreign Unrealized available-for-sale Total (In thousands) Beginning balance $ 562 $ 9 $ 571 $ 602 $ 38 $ 640 Other comprehensive loss before reclassification (7 ) (7 ) (14 ) (47 ) (36 ) (83 ) Amounts reclassified from other comprehensive income (loss) — — — — — — Net current-period other comprehensive loss (7 ) (7 ) (14 ) (47 ) (36 ) (83 ) Ending balance $ 555 $ 2 $ 557 $ 555 $ 2 $ 557 Three Months Ended Nine Months Ended September 26, 2020 Foreign currency Unrealized available-for-sale Total Foreign Unrealized available-for-sale Total (In thousands) Beginning balance $ 306 $ 96 $ 402 $ 381 $ 43 $ 424 Other comprehensive income (loss) before reclassification 124 (24 ) 100 49 29 78 Amounts reclassified from other comprehensive income (loss) — — — — — — Net current-period other comprehensive income 124 (24 ) 100 49 29 78 Ending balance $ 430 $ 72 $ 502 $ 430 $ 72 $ 502
Schedule of Stock Repurchases	The following table summarizes Intevac’s stock repurchases: Three Months Ended Nine Months Ended October 2, 2021 September 26, 2020 October 2, 2021 September 26, 2020 (In thousands, except per share amounts) Shares of common stock repurchased — — — 98 Cost of stock repurchased $ — $ — $ — $ 393 Average price paid per share $ — $ — $ — $ 3.97

Net Loss Per Share (Tables)

Net Loss Per Share (Tables)	9 Months Ended
	Oct. 02, 2021
Earnings Per Share [Abstract]
Computation of Basic and Diluted Net Loss Per Share	The following table sets forth the computation of basic and diluted net loss per share for the three and nine months ended October 2, 2021 and September 26, 2020: Three Months Ended Nine Months Ended October 2, 2021 September 26, 2020 October 2, 2021 September 26, 2020 (In thousands, except per share amounts) Net loss $ (4,233 ) $ (357 ) $ (16,863 ) $ (57 ) Weighted-average shares – basic 24,522 23,771 24,265 23,605 Effect of dilutive potential common shares — — — — Weighted-average shares – diluted 24,522 23,771 24,265 23,605 Net loss per share – basic $ (0.17 ) $ (0.02 ) $ (0.69 ) $ (0.00 ) Net loss per share –diluted $ (0.17 ) $ (0.02 ) $ (0.69 ) $ (0.00 )

Segment Reporting (Tables)

Segment Reporting (Tables)	9 Months Ended
	Oct. 02, 2021
Segment Reporting [Abstract]
Information for Each Reportable Segment	Information for each reportable segment for the three and nine months ended October 2, 2021 and September 26, 2020 is as follows: Net Revenues Three Months Ended Nine Months Ended October 2, 2021 September 26, 2020 October 2, 2021 September 26, 2020 (In thousands) TFE $ 7,998 $ 9,367 $ 22,605 $ 33,925 Photonics 6,795 12,198 22,242 35,323 Total segment net revenues $ 14,793 $ 21,565 $ 44,847 $ 69,248 Operating Income (Loss) Three Months Ended Nine Months Ended October 2, 2021 September 26, 2020 October 2, 2021 September 26, 2020 (In thousands) TFE $ (1,841 ) $ (1,661 ) $ (10,148 ) $ (4,366 ) Photonics (341 ) 3,032 (1,742 ) 9,480 Total segment operating income (loss) (2,182 ) 1,371 (11,890 ) 5,114 Unallocated costs (1,786 ) (1,519 ) (4,891 ) (4,258 ) Income (loss) from operations (3,968 ) (148 ) (16,781 ) 856 Interest income and other income (expense), net 25 8 75 212 Income (loss) before provision for income taxes $ (3,943 ) $ (140 ) $ (16,706 ) $ 1,068
Segment Assets	Total assets for each reportable segment as of October 2, 2021 and January 2, 2021 are as follows: Assets October 2, 2021 January 2, 2021 (In thousands) TFE $ 33,411 $ 44,335 Photonics 16,810 22,923 Total segment assets 50,221 67,258 Cash, cash equivalents and investments 50,658 49,568 Restricted cash 786 787 Deferred income taxes 5,371 5,335 Other current assets 907 1,093 Common property, plant and equipment 1,100 1,443 Common operating lease right-of-use 1,267 1,603 Other assets 183 151 Consolidated total assets $ 110,493 $ 127,238

Restructuring Charges (Tables)

Restructuring Charges (Tables)	9 Months Ended
	Oct. 02, 2021
Restructuring and Related Activities [Abstract]
Changes in Restructuring Reserves	The changes in restructuring reserves, which resulted from cash-based severance payments and other employee-related costs, associated with the cost reduction plans for the three and nine months ended October 2, 2021 and September 26, 2020 were as follows. Three October 2, 2021 Nine October 2, 2021 Three and Months 26, 2020 (In thousands) Severance and other employee-related costs Beginning balance $ — $ — $ — Provision for restructuring reserves 276 319 103 Cash payments made (276 ) (319 ) (103 ) Ending balance $ — $ — $ —

Revenue - Disaggregation of Rev

Revenue - Disaggregation of Revenue from Contracts with Customers (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 02, 2021	Sep. 26, 2020	Oct. 02, 2021	Sep. 26, 2020
Disaggregation of Revenue [Line Items]
Total net revenues	$ 14,793	$ 21,565	$ 44,847	$ 69,248
TFE
Disaggregation of Revenue [Line Items]
Total net revenues	7,998	9,367	22,605	33,925
TFE | Systems, Upgrades and Spare Parts
Disaggregation of Revenue [Line Items]
Total net revenues	6,556	7,732	18,106	29,589
TFE | Field Service
Disaggregation of Revenue [Line Items]
Total net revenues	1,442	1,635	4,499	4,336
Photonics
Disaggregation of Revenue [Line Items]
Total net revenues	6,795	12,198	22,242	35,323
HDD | TFE
Disaggregation of Revenue [Line Items]
Total net revenues	7,919	9,236	18,459	33,523
HDD | TFE | Systems, Upgrades and Spare Parts
Disaggregation of Revenue [Line Items]
Total net revenues	6,495	7,601	14,034	29,189
HDD | TFE | Field Service
Disaggregation of Revenue [Line Items]
Total net revenues	1,424	1,635	4,425	4,334
DCP | TFE
Disaggregation of Revenue [Line Items]
Total net revenues	0		17
DCP | TFE | Systems, Upgrades and Spare Parts
Disaggregation of Revenue [Line Items]
Total net revenues	0		3
DCP | TFE | Field Service
Disaggregation of Revenue [Line Items]
Total net revenues	0		14
PV | TFE
Disaggregation of Revenue [Line Items]
Total net revenues	79	131	279	402
PV | TFE | Systems, Upgrades and Spare Parts
Disaggregation of Revenue [Line Items]
Total net revenues	61	131	219	400
PV | TFE | Field Service
Disaggregation of Revenue [Line Items]
Total net revenues	18	0	60	2
ASP | TFE
Disaggregation of Revenue [Line Items]
Total net revenues	0		3,850
ASP | TFE | Systems, Upgrades and Spare Parts
Disaggregation of Revenue [Line Items]
Total net revenues	0		3,850
ASP | TFE | Field Service
Disaggregation of Revenue [Line Items]
Total net revenues	0		0
Military Products | Photonics
Disaggregation of Revenue [Line Items]
Total net revenues	3,343	4,947	11,552	15,758
Commercial Products | Photonics
Disaggregation of Revenue [Line Items]
Total net revenues	100	139	278	257
Repair and Other Services | Photonics
Disaggregation of Revenue [Line Items]
Total net revenues	259	574	975	1,649
Product | Photonics
Disaggregation of Revenue [Line Items]
Total net revenues	3,702	5,660	12,805	17,664
Firm Fixed Price [Member] | Photonics
Disaggregation of Revenue [Line Items]
Total net revenues	1,571	5,482	4,919	15,374
Cost Plus Fixed Fee [Member] | Photonics
Disaggregation of Revenue [Line Items]
Total net revenues	1,522	1,056	4,518	2,285
Technology Development | Photonics
Disaggregation of Revenue [Line Items]
Total net revenues	$ 3,093	$ 6,538	$ 9,437	$ 17,659

Revenue - Primary Geography Mar

Revenue - Primary Geography Markets (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 02, 2021	Sep. 26, 2020	Oct. 02, 2021	Sep. 26, 2020
Disaggregation of Revenue [Line Items]
Total net revenues	$ 14,793	$ 21,565	$ 44,847	$ 69,248
Products Transferred at a Point in Time
Disaggregation of Revenue [Line Items]
Total net revenues	8,257	9,941	23,179	35,574
Products and Services Transferred Over Time
Disaggregation of Revenue [Line Items]
Total net revenues	6,536	11,624	21,668	33,674
United States
Disaggregation of Revenue [Line Items]
Total net revenues	6,958	13,843	24,777	37,656
Asia
Disaggregation of Revenue [Line Items]
Total net revenues	7,778	7,536	16,047	31,262
Europe
Disaggregation of Revenue [Line Items]
Total net revenues	57	186	4,023	330
TFE
Disaggregation of Revenue [Line Items]
Total net revenues	7,998	9,367	22,605	33,925
TFE | Products Transferred at a Point in Time
Disaggregation of Revenue [Line Items]
Total net revenues	7,998	9,367	22,605	33,925
TFE | Products and Services Transferred Over Time
Disaggregation of Revenue [Line Items]
Total net revenues	0	0	0	0
TFE | United States
Disaggregation of Revenue [Line Items]
Total net revenues	220	1,764	2,708	2,596
TFE | Asia
Disaggregation of Revenue [Line Items]
Total net revenues	7,778	7,536	16,047	31,262
TFE | Europe
Disaggregation of Revenue [Line Items]
Total net revenues	0	67	3,850	67
Photonics
Disaggregation of Revenue [Line Items]
Total net revenues	6,795	12,198	22,242	35,323
Photonics | Products Transferred at a Point in Time
Disaggregation of Revenue [Line Items]
Total net revenues	259	574	574	1,649
Photonics | Products and Services Transferred Over Time
Disaggregation of Revenue [Line Items]
Total net revenues	6,536	11,624	21,668	33,674
Photonics | United States
Disaggregation of Revenue [Line Items]
Total net revenues	6,738	12,079	22,069	35,060
Photonics | Asia
Disaggregation of Revenue [Line Items]
Total net revenues	0	0	0	0
Photonics | Europe
Disaggregation of Revenue [Line Items]
Total net revenues	$ 57	$ 119	$ 173	$ 263

Revenue - Changes in Contract A

Revenue - Changes in Contract Assets and Contract Liabilities (Detail) - USD ($) $ in Thousands	9 Months Ended
	Oct. 02, 2021	Jan. 02, 2021
TFE
Contract liabilities:
Contract liabilities	$ 221	$ 515
Contract liabilities:
Change in contract liabilities	(294)
TFE | Accounts Receivable, Unbilled
Contract assets:
Contract assets	0	369
Contract assets:
Change in contract assets	(369)
TFE | Deferred Revenue
Contract liabilities:
Contract liabilities	197	482
Contract liabilities:
Change in contract liabilities	(285)
TFE | Customer Advances
Contract liabilities:
Contract liabilities	24	33
Contract liabilities:
Change in contract liabilities	(9)
Photonics
Contract assets:
Contract assets	1,580	5,565
Contract assets:
Change in contract assets	(3,985)
Photonics | Accounts Receivable, Unbilled
Contract assets:
Contract assets	1,493	5,439
Contract assets:
Change in contract assets	(3,946)
Photonics | Deferred Revenue
Contract liabilities:
Contract liabilities	550	779
Contract liabilities:
Change in contract liabilities	(229)
Photonics | Retainage
Contract assets:
Contract assets	87	$ 126
Contract assets:
Change in contract assets	$ (39)

Revenue - Additional Informatio

Revenue - Additional Information (Detail) $ in Thousands	9 Months Ended
	Oct. 02, 2021USD ($)Installment
Revenue From Contract With Customers [Line Items]
Revenue remaining performance obligation	$ 44,900
TFE
Revenue From Contract With Customers [Line Items]
Revenue remaining performance obligation	$ 16,900
TFE | Accounts Receivable, Unbilled
Revenue From Contract With Customers [Line Items]
Number of installments | Installment	3
Change in contract assets	$ (369)
TFE | Customer Advances
Revenue From Contract With Customers [Line Items]
Contract with customer liability revenue recognized	33
TFE | Deferred Revenue
Revenue From Contract With Customers [Line Items]
Contract with customer liability revenue recognized	296
Photonics
Revenue From Contract With Customers [Line Items]
Change in contract assets	(3,985)
Revenue remaining performance obligation	27,900
Photonics | Accounts Receivable, Unbilled
Revenue From Contract With Customers [Line Items]
Change in contract assets	$ (3,946)

Revenue - Additional Informat_2

Revenue - Additional Information (Detail 1)	Oct. 02, 2024	Oct. 02, 2023	Oct. 02, 2022	Oct. 02, 2021
Revenue From Contract With Customers [Line Items]
Revenue, remaining performance obligation, percentage				38.00%
Scenario Forecast
Revenue From Contract With Customers [Line Items]
Revenue, remaining performance obligation, percentage	1.00%	21.00%	40.00%

Inventories - Inventories State

Inventories - Inventories Stated at Lower of Average Cost or Net Realizable Value (Detail) - USD ($) $ in Thousands	Oct. 02, 2021	Jan. 02, 2021
Inventory Disclosure [Abstract]
Raw materials	$ 11,262	$ 9,999
Work-in-progress	6,929	4,832
Finished goods	4,262	6,858
Inventories	$ 22,453	$ 21,689

Equity-Based Compensation - Add

Equity-Based Compensation - Additional information (Detail) - USD ($)	1 Months Ended		9 Months Ended
	May 31, 2021	May 31, 2020	Oct. 02, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Purchase of common stock through payroll deductions			85.00%
Offering periods			2 years
Maximum employee salary withholdings for purchase of common stock under the terms of the ESPP			50.00%
Stock issued under Employee Stock Purchase Plans			434,054
Employee stock obligation amount			$ 25,000
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award, vesting period			4 years
Share-based compensation arrangement by share-based payment award, award vesting rights, percentage	200.00%	100.00%
Granted	126,320	109,465	590,931
Cancelled	27,366		82,529

Equity-Based Compensation - Eff

Equity-Based Compensation - Effect of Recording Equity-Based Compensation (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 02, 2021	Sep. 26, 2020	Oct. 02, 2021	Sep. 26, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity-based compensation	$ 885	$ 858	$ 2,872	$ 2,186
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity-based compensation	27	47	159	411
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity-based compensation	673	495	1,872	1,311
ESPP awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity-based compensation	$ 185	$ 316	$ 841	$ 464

Equity-Based Compensation - Wei

Equity-Based Compensation - Weighted-Average Fair Value of Stock Options and Employee Stock Purchase Rights using Weighted-Average Assumptions (Detail) - $ / shares	3 Months Ended		9 Months Ended
	Oct. 02, 2021	Sep. 26, 2020	Oct. 02, 2021	Sep. 26, 2020
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average fair value of grants per share	$ 0	$ 0	$ 0	$ 1.82
Expected volatility	0.00%	0.00%	0.00%	46.04%
Risk free interest rate	0.00%	0.00%	0.00%	0.44%
Expected term of options (in years)	0 years	0 years	0 years	4 years 4 months 20 days
Dividend yield	0.00%	0.00%	0.00%	0.00%
ESPP Purchase Rights
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average fair value of grants per share	$ 2.43	$ 2.20	$ 2.59	$ 2.20
Expected volatility	64.94%	51.72%	60.88%	51.49%
Risk free interest rate	0.07%	0.12%	0.08%	0.14%
Expected term of options (in years)	9 months	1 year 3 months 3 days	10 months 28 days	1 year 2 months 26 days
Dividend yield	0.00%	0.00%	0.00%	0.00%

Equity-Based Compensation - W_2

Equity-Based Compensation - Weighted-Average Fair Value of Performance Stock Options Using Weighted-Average Assumptions (Detail) - Performance Based Restricted Stock Units (PRSU's) - $ / shares	9 Months Ended
	Oct. 02, 2021	Sep. 26, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average fair value of grants per share	$ 7.65	$ 3.16
Expected volatility	56.26%	46.70%
Risk free interest rate	0.15%	0.25%
Dividend yield	0.00%	0.00%

Equity-Based Compensation - Opt

Equity-Based Compensation - Option Activity and Changes (Detail)	9 Months Ended
	Oct. 02, 2021$ / sharesshares
Shares
Options outstanding at January 2, 2021 | shares	1,814,467
Options granted | shares
Options cancelled and forfeited | shares	(211,042)
Options exercised | shares	(73,744)
Options outstanding at October 2, 2021 | shares	1,529,681
Options exercisable at October 2, 2021 | shares	1,317,356
Weighted-Average Exercise Price
Options outstanding at January 2, 2021 | $ / shares	$ 6.66
Options granted | $ / shares
Options cancelled and forfeited | $ / shares	7.47
Options exercised | $ / shares	5.89
Options outstanding at October 2, 2021 | $ / shares	6.57
Options exercisable at October 2, 2021 | $ / shares	$ 6.78

Equity-Based Compensation - Sum

Equity-Based Compensation - Summary of Restricted Stock Units Activity (Detail) - Restricted Stock Units (RSUs) - $ / shares	1 Months Ended		9 Months Ended
	May 31, 2021	May 31, 2020	Oct. 02, 2021
Shares
Non-vested RSUs at january 2, 2021			901,634
Granted	126,320	109,465	590,931
Vested			(301,305)
Cancelled	(27,366)		(82,529)
Non-vested RSUs at October 2, 2021			1,108,731
Weighted Average Grant Date Fair Value
Non-vested RSUs at january 2, 2021			$ 5.30
Granted			6.18
Vested			6.07
Cancelled			4.66
Non-vested RSUs at October 2, 2021			$ 5.60

Warranty - Additional Informati

Warranty - Additional Information (Detail)	9 Months Ended
	Oct. 02, 2021
Guarantees [Abstract]
Minimum product warranty range	12 months
Maximum product warranty range	24 months

Warranty - Activity in Warranty

Warranty - Activity in Warranty Provision Account (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 02, 2021	Sep. 26, 2020	Oct. 02, 2021	Sep. 26, 2020
Guarantees [Abstract]
Opening balance	$ 572	$ 662	$ 480	$ 1,022
Expenditures incurred under warranties	(148)	(89)	(564)	(398)
Accruals for product warranties issued during the reporting period	80	39	553	198
Adjustments to previously existing warranty accruals	106	(57)	141	(267)
Closing balance	$ 610	$ 555	$ 610	$ 555

Warranty - Balance Sheet Classi

Warranty - Balance Sheet Classification of Warranty Provision Account (Detail) - USD ($) $ in Thousands	Oct. 02, 2021	Jul. 03, 2021	Jan. 02, 2021	Sep. 26, 2020	Jun. 27, 2020	Dec. 28, 2019
Guarantees [Abstract]
Other accrued liabilities	$ 542		$ 405
Other long-term liabilities	68		75
Total warranty provision	$ 610	$ 572	$ 480	$ 555	$ 662	$ 1,022

Guarantees - Additional Informa

Guarantees - Additional Information (Detail)	Oct. 02, 2021USD ($)
Guarantees [Abstract]
Letters of credit and bank guarantees outstanding, amount	$ 786,000
Letters of credit and bank guarantees collateralized by restricted cash	$ 786,000

Cash, Cash Equivalents and In_3

Cash, Cash Equivalents and Investments - Cash, Cash Equivalents and Short-Term Investments and Long-Term Investments (Detail) - USD ($) $ in Thousands	Oct. 02, 2021	Jan. 02, 2021
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 50,656	$ 49,530
Unrealized Holding Gains	5	38
Unrealized Holding Losses	3	0
Fair Value	50,658	49,568
Cash and Cash Equivalents
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	33,696	29,341
Fair Value	33,696	29,341
Cash and Cash Equivalents | Cash
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	28,749	24,729
Fair Value	28,749	24,729
Cash and Cash Equivalents | Money market funds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	4,447	3,612
Fair Value	4,447	3,612
Cash and Cash Equivalents | Certificates of deposit
Debt Securities, Available-for-sale [Line Items]
Amortized Cost		1,000
Fair Value		1,000
Cash and Cash Equivalents | Municipal bonds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	500
Fair Value	500
Short-term Investments
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	11,133	14,806
Unrealized Holding Gains	4	33
Unrealized Holding Losses		0
Fair Value	11,137	14,839
Short-term Investments | Corporate bonds and medium-term notes
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	2,919	2,929
Unrealized Holding Gains	1	6
Unrealized Holding Losses		0
Fair Value	2,920	2,935
Short-term Investments | Municipal bonds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	515
Fair Value	515
Short-term Investments | U.S. treasury and agency securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	1,000	4,527
Unrealized Holding Gains		25
Unrealized Holding Losses		0
Fair Value	1,000	4,552
Short-term Investments | Certificates of deposit
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	6,299	6,450
Unrealized Holding Gains	3	2
Unrealized Holding Losses		0
Fair Value	6,302	6,452
Short-term Investments | Commercial paper
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	400	500
Unrealized Holding Gains		0
Unrealized Holding Losses		0
Fair Value	400	500
Short-term Investments | Municipal bonds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost		400
Fair Value		400
Long-term Investments
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	5,827	5,383
Unrealized Holding Gains	1	5
Unrealized Holding Losses	3	0
Fair Value	5,825	5,388
Long-term Investments | Asset backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	480
Fair Value	480
Long-term Investments | Corporate bonds and medium-term notes
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	2,541	3,474
Unrealized Holding Gains	1	4
Unrealized Holding Losses	1	0
Fair Value	2,541	3,478
Long-term Investments | U.S. treasury and agency securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	2,161	1,409
Unrealized Holding Gains		1
Unrealized Holding Losses		0
Fair Value	2,161	1,410
Long-term Investments | Certificates of deposit
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	500	500
Unrealized Holding Gains		0
Unrealized Holding Losses	1	0
Fair Value	499	$ 500
Long-term Investments | Municipal bonds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	145
Unrealized Holding Losses	1
Fair Value	$ 144

Cash, Cash Equivalents and In_4

Cash, Cash Equivalents and Investments - Contractual Maturities of Available-For-Sale Securities (Detail) $ in Thousands	Oct. 02, 2021USD ($)
Investments Debt And Equity Securities [Abstract]
Amortized Cost, Due in one year or less	$ 16,080
Amortized Cost, Due after one through three years	5,827
Amortized Cost	21,907
Fair Value, Due in one year or less	16,084
Fair Value, Due after one through three years	5,825
Fair Value	$ 21,909

Cash, Cash Equivalents and In_5

Cash, Cash Equivalents and Investments - Fair Market Value of Investments with Unrealized Losses Not Deemed to be Other-Than Temporarily Impaired (Detail) $ in Thousands	Oct. 02, 2021USD ($)
Debt Securities, Available-for-sale [Line Items]
Unrealized Loss Position, Less than 12 Months, Fair Value	$ 2,588
Unrealized Loss Position, Less than 12 Months, Gross Unrealized Losses	3
Unrealized Loss Position, Greater than 12 Months, Fair Value	0
Unrealized Loss Position, Greater than 12 Months, Gross Unrealized Losses	0
Certificates of deposit
Debt Securities, Available-for-sale [Line Items]
Unrealized Loss Position, Less than 12 Months, Fair Value	499
Unrealized Loss Position, Less than 12 Months, Gross Unrealized Losses	1
Unrealized Loss Position, Greater than 12 Months, Fair Value	0
Unrealized Loss Position, Greater than 12 Months, Gross Unrealized Losses	0
Corporate bonds and medium-term notes
Debt Securities, Available-for-sale [Line Items]
Unrealized Loss Position, Less than 12 Months, Fair Value	1,944
Unrealized Loss Position, Less than 12 Months, Gross Unrealized Losses	1
Unrealized Loss Position, Greater than 12 Months, Fair Value	0
Unrealized Loss Position, Greater than 12 Months, Gross Unrealized Losses	0
Municipal bonds
Debt Securities, Available-for-sale [Line Items]
Unrealized Loss Position, Less than 12 Months, Fair Value	145
Unrealized Loss Position, Less than 12 Months, Gross Unrealized Losses	1
Unrealized Loss Position, Greater than 12 Months, Fair Value	0
Unrealized Loss Position, Greater than 12 Months, Gross Unrealized Losses	$ 0

Cash, Cash Equivalents and In_6

Cash, Cash Equivalents and Investments - Fair Value Hierarchy of Available-for-Sale Securities Measured at Fair Value on Recurring Basis (Detail) $ in Thousands	Oct. 02, 2021USD ($)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total recurring fair value measurements	$ 21,909
Fair Value, Measurements, Recurring
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total recurring fair value measurements	21,909
Fair Value, Measurements, Recurring | Money market funds
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total recurring fair value measurements	4,447
Fair Value, Measurements, Recurring | Certificates of deposit
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total recurring fair value measurements	6,801
Fair Value, Measurements, Recurring | Commercial paper
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total recurring fair value measurements	400
Fair Value, Measurements, Recurring | U.S. treasury and agency securities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total recurring fair value measurements	3,161
Fair Value, Measurements, Recurring | Corporate bonds and medium-term notes
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total recurring fair value measurements	5,461
Fair Value, Measurements, Recurring | Municipal bonds
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total recurring fair value measurements	1,159
Fair Value, Measurements, Recurring | Asset backed securities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total recurring fair value measurements	480
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total recurring fair value measurements	7,608
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 | Money market funds
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total recurring fair value measurements	4,447
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 | U.S. treasury and agency securities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total recurring fair value measurements	3,161
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total recurring fair value measurements	14,301
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Certificates of deposit
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total recurring fair value measurements	6,801
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Commercial paper
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total recurring fair value measurements	400
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Corporate bonds and medium-term notes
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total recurring fair value measurements	5,461
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Municipal bonds
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total recurring fair value measurements	1,159
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Asset backed securities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total recurring fair value measurements	$ 480

Derivative Instruments - Summar

Derivative Instruments - Summary of Outstanding Derivative Instruments on Gross Basis as Recorded in Consolidated Balance Sheets (Detail) - Undesignated Hedges - USD ($) $ in Thousands	Oct. 02, 2021	Jan. 02, 2021
Derivatives, Fair Value [Line Items]
Notional Amounts	$ 811	$ 983
Derivative Liabilities	2	3
Forward Foreign Currency Contracts
Derivatives, Fair Value [Line Items]
Notional Amounts	811	983
Derivative Liabilities	$ 2	$ 3

Equity - Additional Information

Equity - Additional Information (Detail) - USD ($) $ in Millions	Aug. 15, 2018	Oct. 02, 2021	Nov. 21, 2013
Equity [Abstract]
Stock repurchase authorized amount	$ 40		$ 30
Increase in stock repurchase program	$ 10
Stock repurchase remained available for future stock repurchase		$ 10.4

Equity - Schedule of Changes in

Equity - Schedule of Changes in Stockholders' Equity (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 02, 2021	Sep. 26, 2020	Oct. 02, 2021	Sep. 26, 2020
Class of Stock [Line Items]
Beginning balance	$ 91,748	$ 97,655	$ 101,556	$ 95,793
Common stock issued under employee plans	1,182	871	2,618	1,865
Shares withheld for net share settlement of RSUs	(13)	(19)	(545)	(364)
Equity-based compensation expense	885	858	2,872	2,186
Net income (loss)	(4,233)	(357)	(16,863)	(57)
Other comprehensive income (loss)	(14)	100	(83)	78
Common stock repurchases	0	0	0	(393)
Ending balance	89,555	99,108	89,555	99,108
Common Stock and Additional Paid-in Capital
Class of Stock [Line Items]
Beginning balance	196,088	190,290	193,197	188,313
Common stock issued under employee plans	1,182	871	2,618	1,865
Shares withheld for net share settlement of RSUs	(13)	(19)	(545)	(364)
Equity-based compensation expense	885	858	2,872	2,186
Ending balance	198,142	192,000	198,142	192,000
Treasury Stock
Class of Stock [Line Items]
Beginning balance	(29,551)	(29,551)	(29,551)	(29,158)
Common stock repurchases				(393)
Ending balance	(29,551)	(29,551)	(29,551)	(29,551)
Accumulated Other Comprehensive Income
Class of Stock [Line Items]
Beginning balance	571	402	640	424
Other comprehensive income (loss)	(14)	100	(83)	78
Ending balance	557	502	557	502
Accumulated Deficit
Class of Stock [Line Items]
Beginning balance	(75,360)	(63,486)	(62,730)	(63,786)
Net income (loss)	(4,233)	(357)	(16,863)	(57)
Ending balance	$ (79,593)	$ (63,843)	$ (79,593)	$ (63,843)

Equity - Changes in Accumulated

Equity - Changes in Accumulated Other Comprehensive Income by Component (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 02, 2021	Sep. 26, 2020	Oct. 02, 2021	Sep. 26, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	$ 91,748	$ 97,655	$ 101,556	$ 95,793
Net current-period other comprehensive income loss	(14)	100	(83)	78
Ending balance	89,555	99,108	89,555	99,108
Foreign currency
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	562	306	602	381
Other comprehensive income (loss) before reclassification	(7)	124	(47)	49
Net current-period other comprehensive income loss	(7)	124	(47)	49
Ending balance	555	430	555	430
Unrealized holding gains (losses) on available- for-sale investments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	9	96	38	43
Other comprehensive income (loss) before reclassification	(7)	(24)	(36)	29
Net current-period other comprehensive income loss	(7)	(24)	(36)	29
Ending balance	2	72	2	72
Accumulated Other Comprehensive Income
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	571	402	640	424
Other comprehensive income (loss) before reclassification	(14)	100	(83)	78
Net current-period other comprehensive income loss	(14)	100	(83)	78
Ending balance	$ 557	$ 502	$ 557	$ 502

Equity - Schedule of Stock Repu

Equity - Schedule of Stock Repurchases (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 02, 2021	Sep. 26, 2020	Oct. 02, 2021	Sep. 26, 2020
Equity [Abstract]
Shares of common stock repurchased	0	0	0	98
Cost of stock repurchased	$ 0	$ 0	$ 0	$ 393
Average price paid per share	$ 0	$ 0	$ 0	$ 3.97

Net Loss Per Share - Computatio

Net Loss Per Share - Computation of Basic and Diluted Net Loss Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 02, 2021	Sep. 26, 2020	Oct. 02, 2021	Sep. 26, 2020
Earnings Per Share [Abstract]
Net loss	$ (4,233)	$ (357)	$ (16,863)	$ (57)
Weighted-average shares – basic	24,522	23,771	24,265	23,605
Effect of dilutive potential common shares	0	0	0	0
Weighted-average shares – diluted	24,522	23,771	24,265	23,605
Net loss per share – basic	$ (0.17)	$ (0.02)	$ (0.69)	$ 0
Net loss per share –diluted	$ (0.17)	$ (0.02)	$ (0.69)	$ 0

Segment Reporting - Additional

Segment Reporting - Additional Information (Detail)	9 Months Ended
	Oct. 02, 2021Segment
Segment Reporting [Abstract]
Number of reportable segments	2
Allocation of corporate expenses to the segments	3.00%

Segment Reporting - Information

Segment Reporting - Information for Each Reportable Segment (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 02, 2021	Sep. 26, 2020	Oct. 02, 2021	Sep. 26, 2020
Segment Reporting Information [Line Items]
Total segment net revenues	$ 14,793	$ 21,565	$ 44,847	$ 69,248
Income (loss) from operations	(3,968)	(148)	(16,781)	856
Interest income and other income (expense), net	25	8	75	212
Income (loss) before provision for income taxes	(3,943)	(140)	(16,706)	1,068
TFE
Segment Reporting Information [Line Items]
Total segment net revenues	7,998	9,367	22,605	33,925
Photonics
Segment Reporting Information [Line Items]
Total segment net revenues	6,795	12,198	22,242	35,323
Operating Segments
Segment Reporting Information [Line Items]
Income (loss) from operations	(2,182)	1,371	(11,890)	5,114
Operating Segments | TFE
Segment Reporting Information [Line Items]
Income (loss) from operations	(1,841)	(1,661)	(10,148)	(4,366)
Operating Segments | Photonics
Segment Reporting Information [Line Items]
Income (loss) from operations	(341)	3,032	(1,742)	9,480
Unallocated Amount to Segment
Segment Reporting Information [Line Items]
Unallocated costs	$ (1,786)	$ (1,519)	$ (4,891)	$ (4,258)

Segment Reporting - Assets for

Segment Reporting - Assets for Each Reportable Segment (Detail) - USD ($) $ in Thousands	Oct. 02, 2021	Jan. 02, 2021
Segment Reporting, Asset Reconciling Item [Line Items]
Consolidated total assets	$ 110,493	$ 127,238
Cash, cash equivalents and investments	50,658	49,568
Restricted cash	786	787
Deferred income taxes	5,371	5,335
Other current assets	907	1,093
Common property, plant and equipment	1,100	1,443
Common operating lease right-of-use assets	1,267	1,603
Other assets	183	151
Operating Segments
Segment Reporting, Asset Reconciling Item [Line Items]
Consolidated total assets	50,221	67,258
Operating Segments | TFE
Segment Reporting, Asset Reconciling Item [Line Items]
Consolidated total assets	33,411	44,335
Operating Segments | Photonics
Segment Reporting, Asset Reconciling Item [Line Items]
Consolidated total assets	$ 16,810	$ 22,923

Income Taxes - Additional Infor

Income Taxes - Additional Information (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Oct. 02, 2021	Sep. 26, 2020	Oct. 02, 2021	Sep. 26, 2020	Dec. 31, 2020
Government Grants [Line Items]
Provision for income taxes	$ 290,000	$ 217,000	$ 157,000	$ 1,125,000
Income tax benefit			29,000
Income tax provision on earnings of subsidiaries	179,000	111,000		659,000
Deferred payroll tax liability					$ 764,000
Proceeds From Government Grants		124,000	83,000	434,000
Grant [Member] | Cost of Sales [Member]
Government Grants [Line Items]
Proceeds From Government Grants		72,000	56,000	252,000
Grant [Member] | Research and Development Expense [Member]
Government Grants [Line Items]
Proceeds From Government Grants		20,000	10,000	68,000
Grant [Member] | Selling, General and Administrative Expenses [Member]
Government Grants [Line Items]
Proceeds From Government Grants		32,000	17,000	114,000
Foreign Tax Authority | Singapore
Government Grants [Line Items]
Income tax charge (benefit)	$ 111,000	$ 98,000	$ 183,000	$ 471,000

Restructuring Charges - Additio

Restructuring Charges - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 02, 2021	Oct. 02, 2020	Oct. 02, 2021
Restructuring and Related Activities [Abstract]
Percentage of reduction of global workforce	5.20%	1.00%
Reduction in salary, wages and other employee-related expenses due to implementation of plan		$ 864	$ 2,000

Restructuring Charges - Changes

Restructuring Charges - Changes in Restructuring Reserves (Detail) - Severance and Other Employee Related Costs - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 02, 2021	Sep. 26, 2020	Oct. 02, 2021
Restructuring Cost and Reserve [Line Items]
Provision for restructuring reserves	$ 276	$ 103	$ 319
Cash payments made	$ (276)	$ (103)	$ (319)