Intevac (IVAC) 10-Q 27 Oct 20 2020 Q3 Quarterly report Financial data

Cover Page

Cover Page - shares	9 Months Ended
	Sep. 26, 2020	Oct. 27, 2020
Cover [Abstract]
Document Type	10-Q
Amendment Flag	false
Entity Interactive Data Current	Yes
Document Period End Date	Sep. 26, 2020
Document Fiscal Year Focus	2020
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	--01-02
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		23,853,623
Security Exchange Name	NASDAQ

CONDENSED CONSOLIDATED BALANCE

CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 26, 2020	Dec. 28, 2019
Current assets:
Cash and cash equivalents	$ 27,245	$ 19,767
Short-term investments	18,342	16,720
Trade and other accounts receivable, net of allowances of $0 at both September 26, 2020 and at December 28, 2019	23,221	28,619
Inventories	23,638	24,907
Prepaid expenses and other current assets	2,031	1,504
Total current assets	94,477	91,517
Long-term investments	3,074	5,537
Restricted cash	787	787
Property, plant and equipment, net	11,552	11,598
Operating lease right-of-use-assets	8,739	10,279
Deferred income taxes and other long-term assets	5,740	6,604
Total assets	124,369	126,322
Current liabilities:
Current operating lease liabilities	2,776	2,524
Accounts payable	4,463	4,199
Accrued payroll and related liabilities	6,478	6,488
Other accrued liabilities	2,289	3,593
Customer advances	1,051	4,007
Total current liabilities	17,057	20,811
Noncurrent liabilities:
Noncurrent operating lease liabilities	7,516	9,532
Other long-term liabilities	688	186
Total noncurrent liabilities	8,204	9,718
Stockholders' equity:
Common stock, $0.001 par value	24	23
Additional paid-in capital	191,976	188,290
Treasury stock, 5,087 shares at September 26, 2020 and 4,989 shares at December 28, 2019	(29,551)	(29,158)
Accumulated other comprehensive income	502	424
Accumulated deficit	(63,843)	(63,786)
Total stockholders' equity	99,108	95,793
Total liabilities and stockholders' equity	$ 124,369	$ 126,322

CONDENSED CONSOLIDATED BALANC_2

CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Sep. 26, 2020	Dec. 28, 2019
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	4,989

CONDENSED CONSOLIDATED STATEMEN

CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 26, 2020	Sep. 28, 2019	Sep. 26, 2020	Sep. 28, 2019
Net revenues:
Total net revenues	$ 21,565	$ 26,299	$ 69,248	$ 73,441
Cost of net revenues:
Total cost of net revenues	12,265	17,521	40,372	49,066
Gross profit	9,300	8,778	28,876	24,375
Operating expenses:
Research and development	3,603	3,596	10,594	11,013
Selling, general and administrative	5,845	5,615	17,426	16,720
Total operating expenses	9,448	9,211	28,020	27,733
Income (loss) from operations	(148)	(433)	856	(3,358)
Interest income and other income (expense), net	8	126	212	448
Income (loss) before provision for income taxes	(140)	(307)	1,068	(2,910)
Provision for income taxes	217	173	1,125	1,144
Net loss	$ (357)	$ (480)	$ (57)	$ (4,054)
Net loss per share:
Basic and Diluted	$ (0.02)	$ (0.02)	$ 0	$ (0.18)
Weighted average common shares outstanding:
Basic and Diluted	23,771	23,130	23,605	22,992
Systems and components
Net revenues:
Total net revenues	$ 15,027	$ 21,090	$ 51,589	$ 59,965
Cost of net revenues:
Total cost of net revenues	8,389	14,180	29,969	39,741
Technology development
Net revenues:
Total net revenues	6,538	5,209	17,659	13,476
Cost of net revenues:
Total cost of net revenues	$ 3,876	$ 3,341	$ 10,403	$ 9,325

CONDENSED CONSOLIDATED STATEM_2

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 26, 2020	Sep. 28, 2019	Sep. 26, 2020	Sep. 28, 2019
Statement Of Income And Comprehensive Income [Abstract]
Net loss	$ (357)	$ (480)	$ (57)	$ (4,054)
Other comprehensive income (loss), before tax:
Other comprehensive income (loss), before tax Change in unrealized net gain on available-for-sale investments	(24)	3	29	80
Foreign currency translation gains (losses)	124	(87)	49	(87)
Other comprehensive income (loss), before tax	100	(84)	78	(7)
Income tax (expense) benefit related to items in other comprehensive income (loss)	0	0	0	0
Other comprehensive income (loss), net of tax	100	(84)	78	(7)
Comprehensive income (loss)	$ (257)	$ (564)	$ 21	$ (4,061)

CONDENSED CONSOLIDATED STATEM_3

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 26, 2020	Sep. 28, 2019
Operating activities
Net loss	$ (57)	$ (4,054)
Adjustments to reconcile net loss to net cash and cash equivalents provided by (used in) operating activities:
Depreciation and amortization	2,645	2,778
Net amortization (accretion) of investment premiums and discounts	(9)	(55)
Equity-based compensation	2,186	2,260
Straight-line rent adjustment and amortization of lease incentives	(224)	(238)
Change in the fair value of acquisition-related contingent consideration	0	7
Deferred income taxes	516	552
Loss on disposal of equipment	0	87
Changes in operating assets and liabilities	2,714	(2,470)
Total adjustments	7,828	2,921
Net cash and cash equivalents provided by (used in) operating activities	7,771	(1,133)
Investing activities
Purchases of investments	(17,071)	(18,917)
Proceeds from sales and maturities of investments	17,950	18,751
Purchases of leasehold improvements and equipment	(2,329)	(3,279)
Net cash and cash equivalents used in investing activities	(1,450)	(3,445)
Financing activities
Net proceeds from issuance of common stock	1,865	1,770
Common stock repurchases	(393)	(111)
Taxes paid related to net share settlement	(364)	(296)
Payment of acquisition-related contingent consideration	0	(230)
Net cash and cash equivalents provided by financing activities	1,108	1,133
Effect of exchange rate changes on cash	49	(87)
Net increase (decrease) in cash, cash equivalents and restricted cash	7,478	(3,532)
Cash, cash equivalents and restricted cash at beginning of period	20,554	19,884
Cash, cash equivalents and restricted cash at end of period	28,032	16,352
Non-cash investing and financing activity
Additions to right-of-use-assets obtained from new operating lease liabilities	$ 128	$ 0

Description of Business, Basis

Description of Business, Basis of Presentation and Significant Accounting Policy	9 Months Ended
	Sep. 26, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Description of Business, Basis of Presentation and Significant Accounting Policy	1. Description of Business, Basis of Presentation and Significant Accounting Policy 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”), and photovoltaic (“PV”) solar cell 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. COVID-19 In March 2020, the World Health Organization characterized the coronavirus (“COVID-19”) COVID-19 COVID-19, on-site 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 December 28, 2019 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 September 26, 2020 are not necessarily indicative of future operating results. The preparation of 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 financial statements and accompanying notes. Actual results could differ materially from those estimates. Significant Accounting Policy Government Grants and Credits The Company generally records grants from governmental agencies related to income as a reduction in operating expense. Grants are recognized when there is reasonable assurance that the Company will comply with the conditions attached to the grant arrangement and the grant will be received. Reimbursements of eligible expenditures pursuant to government assistance programs are recorded as reductions of operating costs when the related costs have been incurred and there is reasonable assurance regarding collection of the claim. Grant claims not settled by the balance sheet date are recorded as receivables, provided their receipt is reasonably assured. The determination of the amount of the claim, and accordingly the receivable amount, requires management to make calculations based on its interpretation of eligible expenditures in accordance with the terms of the programs. The reimbursement claims submitted by the Company are subject to review by the relevant government agencies. In Singapore, Intevac receives government assistance under the Job Support Scheme (“JSS”). 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 research and development (“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.

Revenue

Revenue	9 Months Ended
	Sep. 26, 2020
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 September 26, 2020 and September 28, 2019 along with the reportable segment for each category. Major Products and Service Lines TFE Three Months Ended Three Months Ended (In thousands) HDD DCP PV Total HDD DCP PV Total Systems, upgrades and spare parts $ 7,601 $ — $ 131 $ 7,732 $ 7,737 $ — $ 8,225 $ 15,962 Field service 1,635 — — 1,635 1,109 — 45 1,154 Total TFE net revenues $ 9,236 $ — $ 131 $ 9,367 $ 8,846 $ — $ 8,270 $ 17,116 Nine Months Ended Nine Months Ended (In thousands) HDD DCP PV Total HDD DCP PV Total Systems, upgrades and spare parts $ 29,189 $ — $ 400 $ 29,589 $ 31,210 $ — $ 14,616 $ 45,826 Field service 4,334 — 2 4,336 3,452 2 45 3,499 Total TFE net revenues $ 33,523 $ — $ 402 $ 33,925 $ 34,662 $ 2 $ 14,661 $ 49,325 Three Months Ended Nine Months Ended Photonics September 26, 2020 September 28, 2019 September 26, 2020 September 28, 2019 (In thousands) Products: Military products $ 4,947 $ 3,320 $ 15,758 $ 8,115 Commercial products 139 81 257 581 Repair and other services 574 573 1,649 1,944 Total Photonics product net revenues 5,660 3,974 17,664 10,640 Technology development: Firm Fixed Price (“FFP”) 5,482 3,218 15,374 7,995 Cost Plus Fixed Fee (“CPFF”) 1,056 1,991 2,285 5,479 Time and materials — — — 2 Total technology development net revenues 6,538 5,209 17,659 13,476 Total Photonics net revenues $ 12,198 $ 9,183 $ 35,323 $ 24,116 Primary Geographical Markets Three Months Ended Three Months Ended September 26, 2020 September 28, 2019 (In thousands) TFE Photonics Total TFE Photonics Total United States $ 1,764 $ 12,079 $ 13,843 $ 478 $ 9,050 $ 9,528 Asia 7,536 — 7,536 16,638 — 16,638 Europe 67 119 186 — 133 133 Total net revenues $ 9,367 $ 12,198 $ 21,565 $ 17,116 $ 9,183 $ 26,299 Nine Months Ended Nine Months Ended September 26, 2020 September 28, 2019 (In thousands) TFE Photonics Total TFE Photonics Total United States $ 2,596 $ 35,060 $ 37,656 $ 995 $ 23,578 $ 24,573 Asia 31,262 — 31,262 48,330 — 48,330 Europe 67 263 330 — 538 538 Total net revenues $ 33,925 $ 35,323 $ 69,248 $ 49,325 $ 24,116 $ 73,441 Timing of Revenue Recognition Three Months Ended Three Months Ended September 26, 2020 September 28, 2019 (In thousands) TFE Photonics Total TFE Photonics Total Products transferred at a point in time $ 9,367 $ 574 $ 9,941 $ 17,116 $ 573 $ 17,689 Products and services transferred over time — 11,624 11,624 — 8,610 8,610 $ 9,367 $ 12,198 $ 21,565 $ 17,116 $ 9,183 $ 26,299 Nine Months Ended Nine Months Ended September 26, 2020 September 28, 2019 (In thousands) TFE Photonics Total TFE Photonics Total Products transferred at a point in time $ 33,925 $ 1,649 $ 35,574 $ 49,325 $ 1,944 $ 51,269 Products and services transferred over time — 33,674 33,674 — 22,172 22,172 $ 33,925 $ 35,323 $ 69,248 $ 49,325 $ 24,116 $ 73,441 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 September 26, 2020: September 26, December 28, Nine Months Change (In thousands) TFE: Contract assets: Accounts receivable, unbilled $ 560 $ 760 $ (200 ) Contract liabilities: Deferred revenue $ 399 $ 320 $ 79 Customer advances 1,051 4,007 (2,956 ) $ 1,450 $ 4,327 $ (2,877 ) Photonics: Contract assets: Accounts receivable, unbilled $ 3,238 $ 3,210 $ 28 Retainage 123 99 24 $ 3,361 $ 3,309 $ 52 Contract liabilities: Deferred revenue $ 31 $ — $ 31 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 September 26, 2020, contract assets in our TFE segment decreased by $200,000 primarily due to the subsequent invoicing of certain unbilled spare parts revenue at December 28, 2019. 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 September 26, 2020, we recognized revenue in our TFE segment of $4.0 million and $119,000 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 September 26, 2020, contract assets in our Photonics segment increased by $52,000 primarily due to 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. On September 26, 2020, we had $63.3 million of remaining performance obligations, which we also refer to as backlog. Backlog at September 26, 2020 consisted of $18.1 million of TFE backlog and $45.2 million of Photonics backlog. We expect to recognize approximately 42% of our remaining performance obligations as revenue in 2020, 30% in 2021, 18% in 2022, 9% in 2023 and 1% in 2024 and thereafter.

Inventories

Inventories	9 Months Ended
	Sep. 26, 2020
Inventory Disclosure [Abstract]
Inventories	3. Inventories Inventories are stated at the lower of average cost or net realizable value and consist of the following: September 26, December 28, (In thousands) Raw materials $ 11,166 $ 15,286 Work-in-progress 5,732 4,748 Finished goods 6,740 4,873 $ 23,638 $ 24,907 Net inventories at September 26, 2020 and December 28, 2019 included one VERTEX SPECTRA system for DCP under evaluation in a customer’s factory and one MATRIX PVD system for advance semiconductor packaging under evaluation in a customer’s factory. Net inventories at September 26, 2020 also included one VERTEX SPECTRA system for DCP at Intevac’s factory.

Equity-Based Compensation

Equity-Based Compensation	9 Months Ended
	Sep. 26, 2020
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Equity-Based Compensation	4. Equity-Based Compensation At September 26, 2020, Intevac had equity-based awards outstanding under the 2020 Equity Incentive Plan, the 2012 Equity Incentive Plan and the 2004 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 September 26, 2020 and September 28, 2019 was as follows: Three Months Ended Nine Months Ended September 26, September 28, September 26, September 28, (In thousands) Equity-based compensation by type of award: Stock options $ 47 $ 213 $ 411 $ 610 RSUs 495 375 1,311 1,018 ESPP awards 316 163 464 632 Total equity-based compensation $ 858 $ 751 $ 2,186 $ 2,260 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 September 26, 2020 and changes during the nine months ended September 26, 2020 were as follows: Shares Weighted-Average Options outstanding at December 28, 2019 2,096,610 $ 6.63 Options granted 6,000 $ 4.88 Options cancelled and forfeited (193,461 ) $ 6.68 Options exercised (61,722 ) $ 4.77 Options outstanding at September 26, 2020 1,847,427 $ 6.68 Options exercisable at September 26, 2020 1,395,582 $ 6.80 Intevac issued 392,088 shares of common stock under the ESPP during the nine months ended September 26, 2020. 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 September 26, September 28, September 26, September 28, Stock Options: Weighted-average fair value of grants per share $ — $ 1.84 $ 1.82 $ 2.05 Expected volatility — 43.87 % 46.04 % 43.22 % Risk-free interest rate — 1.57 % 0.44 % 1.86 % Expected term of options (in years) — 4.32 4.39 4.56 Dividend yield — None None None Three Months Ended Nine Months Ended September 26, September 28, September 26, September 28, Stock Purchase Rights: Weighted-average fair value of grants per share $ 2.20 $ 1.45 $ 2.20 $ 1.73 Expected volatility 51.72 % 38.27 % 51.49 % 45.81 % Risk-free interest rate 0.12 % 1.85 % 0.14 % 2.28 % Expected term of purchase rights (in years) 1.26 0.75 1.24 0.91 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. Performance-based stock options (“PSOs”) vest upon the achievement of certain market conditions (our stock performance) during a set performance period (typically 4 years) subject to the grantee’s continued service with Intevac through the date the applicable market condition is achieved. The fair value is based on the values calculated using a Monte Carlo simulation model on the grant date. Compensation cost is not adjusted in future periods for subsequent changes in the expected outcome of market related conditions. The compensation expense is recognized over the derived service period. We granted 37,500 of such stock options to the Chief Executive Officer in the three months ended June 29, 2019. These PSOs have a derived service period of 1.1 years. Intevac estimated the weighted-average fair value of PSOs using the following weighted-average assumptions: Nine Months Ended Weighted-average fair value of grants per share $ 1.75 Expected volatility 43.43 % Risk free interest rate 1.96 % Expected term (in years) 4.60 Dividend yield None RSUs RSU activity as of September 26, 2020 and changes during the nine months ended September 26, 2020 were as follows: Shares Weighted-Average Grant Date Fair Value Non-vested 553,355 $ 6.15 Granted 658,090 $ 4.85 Vested (221,483 ) $ 6.51 Cancelled and forfeited (35,815 ) $ 6.05 Non-vested 954,147 $ 5.17 Time-based RSUs are converted into shares of Intevac common stock upon vesting on a one-for-one In May 2020, we granted 109,465 performance-based restricted stock units (“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

Purchased Intangible Assets

Purchased Intangible Assets	9 Months Ended
	Sep. 26, 2020
Goodwill and Intangible Assets Disclosure [Abstract]
Purchased Intangible Assets	5. Purchased Intangible Assets Details of finite-lived intangible assets by segment as of September 26, 2020 are as follows. September 26, 2020 Gross Accumulated Net (In thousands) TFE $ 7,172 $ (7,172 ) $ — Photonics 1,215 (1,211 ) 4 $ 8,387 $ (8,383 ) $ 4 Total amortization expense of finite-lived intangibles for the three and nine months ended September 26, 2020 was $11,000 and $270,000, respectively. On the condensed consolidated balance sheets, purchased intangible assets is included in deferred income taxes and other long-term assets. As of September 26, 2020, future amortization expense of $4,000 is expected to be recorded in 2020.

Acquisition-Related Contingent

Acquisition-Related Contingent Consideration	9 Months Ended
	Sep. 26, 2020
Business Combinations [Abstract]
Contingent Consideration	6. Acquisition-Related Contingent Consideration In connection with the acquisition of Solar Implant Technologies, Inc. (“SIT”), Intevac agreed to pay to the selling shareholders in cash a revenue earnout on Intevac’s net revenues from commercial sales of certain products over a specified period up to an aggregate of $9.0 million. The earnout period terminated on June 30, 2019. There is no remaining contingent consideration obligation associated with the earnout agreement at September 26, 2020. The following table represents a reconciliation of the change in the fair value measurement of the contingent consideration liability for the nine months ended September 28, 2019 (in thousands): Nine Months Ended September 28, 2019 Opening balance $ 223 Changes in fair value 7 Cash payments made (230 ) Closing balance $ —

Warranty

Warranty	9 Months Ended
	Sep. 26, 2020
Guarantees [Abstract]
Warranty	7. 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 and solar cell 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 September 26, 2020 and September 28, 2019: Three Months Ended Nine Months Ended September 26, 2020 September 28, 2019 September 26, 2020 September 28, 2019 (In thousands) Opening balance $ 662 $ 948 $ 1,022 $ 997 Expenditures incurred under warranties (89 ) (167 ) (398 ) (592 ) Accruals for product warranties issued during the reporting period 39 427 198 829 Adjustments to previously existing warranty accruals (57 ) (72 ) (267 ) (98 ) Closing balance $ 555 $ 1,136 $ 555 $ 1,136 The following table displays the balance sheet classification of the warranty provision account at September 26, 2020 and at December 28, 2019: September 26, December 28, 2020 2019 (In thousands) Other accrued liabilities $ 425 $ 846 Other long-term liabilities 130 176 Total warranty provision $ 555 $ 1,022

Guarantees

Guarantees	9 Months Ended
	Sep. 26, 2020
Guarantees [Abstract]
Guarantees	8. 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 September 26, 2020, we had letters of credit and bank guarantees outstanding totaling $787,000, 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 $787,000 of restricted cash.

Cash, Cash Equivalents and Inve

Cash, Cash Equivalents and Investments	9 Months Ended
	Sep. 26, 2020
Investments Debt And Equity Securities [Abstract]
Cash, Cash Equivalents and Investments	9. Cash, Cash Equivalents and Investments Cash and cash equivalents, short-term investments and long-term investments consist of: September 26, 2020 Amortized Cost Unrealized Unrealized Fair Value (In thousands) Cash and cash equivalents: Cash $ 23,829 $ — $ — $ 23,829 Money market funds 3,416 — — 3,416 Total cash and cash equivalents $ 27,245 $ — $ — $ 27,245 Short-term investments: Certificates of deposit $ 7,450 $ 7 $ — $ 7,457 Commercial paper 499 1 — 500 Corporate bonds and medium-term notes 3,842 27 — 3,869 U.S. treasury and agency securities 6,481 35 — 6,516 Total short-term investments $ 18,272 $ 70 $ — $ 18,342 Long-term investments: Certificates of deposit $ 500 $ — $ — $ 500 Corporate bonds and medium-term notes 2,572 2 — 2,574 Total long-term investments $ 3,072 $ 2 $ — $ 3,074 Total cash, cash equivalents, and investments $ 48,589 $ 72 $ — $ 48,661 December 28, 2019 Amortized Cost Unrealized Unrealized Fair Value (In thousands) Cash and cash equivalents: Cash $ 16,512 $ — $ — $ 16,512 Money market funds 3,255 — — 3,255 Total cash and cash equivalents $ 19,767 $ — $ — $ 19,767 Short-term investments: Certificates of deposit $ 3,000 $ 1 $ — $ 3,001 Commercial paper 1,891 2 — 1,893 Corporate bonds and medium-term notes 6,383 25 — 6,408 U.S. treasury and agency securities 5,417 1 — 5,418 Total short-term investments $ 16,691 $ 29 $ — $ 16,720 Long-term investments: Certificates of deposit $ 499 $ 1 $ — $ 500 Corporate bonds and medium-term notes 2,530 12 — 2,542 U.S. treasury and agency securities 2,494 1 — 2,495 Total long-term investments $ 5,523 $ 14 $ — $ 5,537 Total cash, cash equivalents, and investments $ 41,981 $ 43 $ — $ 42,024 The contractual maturities of available-for-sale September 26, 2020 Amortized Fair Value (In thousands) Due in one year or less $ 21,688 $ 21,758 Due after one through two years 3,072 3,074 $ 24,760 $ 24,832 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 Total Level 1 Level 2 (In thousands) Recurring fair value measurements: Available-for-sale Money market funds $ 3,416 $ 3,416 $ — U.S. treasury and agency securities 6,516 6,516 — Certificates of deposit 7,957 — 7,957 Commercial paper 500 — 500 Corporate bonds and medium-term notes 6,443 — 6,443 Total recurring fair value measurements $ 24,832 $ 9,932 $ 14,900

Derivative Instruments

Derivative Instruments	9 Months Ended
	Sep. 26, 2020
Derivative Instrument Detail [Abstract]
Derivative Instruments	10. 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 September 26, 2020 and December 28, 2019: Notional Amounts Derivative Liabilities Derivative Instrument September 26 December 28, September 26, December 28, Balance Fair Balance Fair (In thousands) Undesignated Hedges: Forward Foreign Currency Contracts $ 871 $ 1,035 (a) $ 5 (a) $ 4 Total Hedges $ 871 $ 1,035 $ 5 $ 4 (a) Other accrued liabilities

Equity

Equity	9 Months Ended
	Sep. 26, 2020
Equity [Abstract]
Equity	11. Equity Condensed Consolidated Statement of Changes in Equity The changes in stockholders’ equity by component for the three and nine months ended September 26, 2020 and September 28, 2019, are as follows (in thousands): 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 Three months ended September 28, 2019 Common Paid-in Treasury Accumulated Accumulated Total Balance at June 29, 2019 $ 185,489 $ (29,089 ) $ 455 $ (68,508 ) $ 88,347 Common stock issued under employee plans 749 — — — 749 Shares withheld for net share settlement of RSUs (28 ) — — — (28 ) Equity-based compensation expense 751 — — — 751 Net loss — — — (480 ) (480 ) Other comprehensive loss — — (84 ) — (84 ) Common stock repurchases — (69 ) — — (69 ) Balance at September 28, 2019 $ 186,961 $ (29,158 ) $ 371 $ (68,988 ) $ 89,186 Nine months ended September 28, 2019 Common Paid-in Treasury Accumulated Accumulated Total Balance at December 29, 2018 $ 183,227 $ (29,047 ) $ 378 $ (64,934 ) $ 89,624 Common stock issued under employee plans 1,770 — — — 1,770 Shares withheld for net share settlement of RSUs (296 ) — — — (296 ) Equity-based compensation expense 2,260 — — — 2,260 Net loss — — — (4,054 ) (4,054 ) Other comprehensive loss — — (7 ) — (7 ) Common stock repurchases — (111 ) — — (111 ) Balance at September 28, 2019 $ 186,961 $ (29,158 ) $ 371 $ (68,988 ) $ 89,186 Accumulated Other Comprehensive Income The changes in accumulated other comprehensive income by component for the three and nine months ended September 26, 2020 and September 28, 2019, are as follows. Three Months Ended Nine Months Ended September 26, 2020 Foreign 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 Three Months Ended Nine Months Ended September 28, 2019 Foreign Unrealized available-for-sale Total Foreign Unrealized available-for-sale Total (In thousands) Beginning balance $ 405 $ 50 $ 455 $ 405 $ (27 ) $ 378 Other comprehensive income (loss) before reclassification (87 ) 3 (84 ) (87 ) 80 (7 ) Amounts reclassified from other comprehensive income (loss) — — — — — — Net current-period other comprehensive loss (87 ) 3 (84 ) (87 ) 80 (7 ) Ending balance $ 318 $ 53 $ 371 $ 318 $ 53 $ 371 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 September 26, 2020, $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 September 26, 2020 September 28, 2019 September 26, 2020 September 28, 2019 (In thousands, except per share amounts) Shares of common stock repurchased — 15 98 24 Cost of stock repurchased $ — $ 69 $ 393 $ 111 Average price paid per share $ — $ 4.65 $ 3.97 $ 4.67 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
	Sep. 26, 2020
Earnings Per Share [Abstract]
Net Loss Per Share	12. 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 September 26, 2020 and September 28, 2019: Three Months Ended Nine Months Ended September 26, September 28, September 26, September 28, (In thousands, except per share amounts) Net loss $ (357 ) $ (480 ) $ (57 ) $ (4,054 ) Weighted-average shares – basic 23,771 23,130 23,605 22,992 Effect of dilutive potential common shares — — — — Weighted-average shares – diluted 23,771 23,130 23,605 22,992 Net loss per share – basic $ (0.02 ) $ (0.02 ) $ (0.00 ) $ (0.18 ) Net loss per share – diluted $ (0.02 ) $ (0.02 ) $ (0.00 ) $ (0.18 ) 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
	Sep. 26, 2020
Segment Reporting [Abstract]
Segment Reporting	13. 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 September 26, 2020 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 and DCP 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 September 26, 2020 and September 28, 2019 is as follows: Net Revenues Three Months Ended Nine Months Ended September 26, 2020 September 28, 2019 September 26, 2020 September 28, 2019 (In thousands) TFE $ 9,367 $ 17,116 $ 33,925 $ 49,325 Photonics 12,198 9,183 35,323 24,116 Total segment net revenues $ 21,565 $ 26,299 $ 69,248 $ 73,441 Operating Income (Loss) Three Months Ended Nine Months Ended September 26, 2020 September 28, 2019 September 26, 2020 September 28, 2019 (In thousands) TFE $ (1,661 ) $ (1,542 ) $ (4,366 ) $ (3,434 ) Photonics 3,032 2,268 9,480 3,114 Total segment operating income (loss) 1,371 726 5,114 (320 ) Unallocated costs (1,519 ) (1,159 ) (4,258 ) (3,038 ) Income (loss) from operations (148 ) (433 ) 856 (3,358 ) Interest income and other income (expense), net 8 126 212 448 Income (loss) before provision for income taxes $ (140 ) $ (307 ) $ 1,068 $ (2,910 ) Total assets for each reportable segment as of September 26, 2020 and December 28, 2019 are as follows: Assets September 26, December 28, (In thousands) TFE $ 45,819 $ 51,153 Photonics 19,049 22,071 Total segment assets 64,868 73,224 Cash, cash equivalents and investments 48,661 42,024 Restricted cash 787 787 Deferred income taxes 5,736 6,252 Other current assets 1,145 752 Common property, plant and equipment 1,461 1,307 Common operating lease right-of-use 1,711 1,898 Other assets — 78 Consolidated total assets $ 124,369 $ 126,322

Income Taxes

Income Taxes	9 Months Ended
	Sep. 26, 2020
Income Tax Disclosure [Abstract]
Income Taxes	14. Income Taxes Intevac recorded income tax provisions of $ 217,000 173,000 low-taxed The Inland Revenue Authority of Singapore (“IRAS”) conducted a review of the fiscal 2009 through 2010 tax returns of the Company’s wholly-owned subsidiary, Intevac Asia Pte. Ltd. IRAS challenged the Company’s tax position with respect to certain deductions. The Company paid all contested taxes and the related interest to have the right to defend its position under Singapore tax law. In October 2020, the Company received an unfavorable decision on its appeal to the Singapore High Court. Management is considering a further appeal to the Court of Appeal, which must be made within thirty days of the High Court decision. As of September 26, 2020, the $915,000 contested tax deposit reported on its balance sheet was fully reserved. 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 have 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. Under the JSS, Intevac expects to receive approximately $554,000 in JSS grants in fiscal 2020. 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
	Sep. 26, 2020
Restructuring and Related Activities [Abstract]
Restructuring Charges	15. Restructuring Charges During the third quarter of fiscal 2020, Intevac substantially completed implementation of the 2020 cost reduction plan (the “Cost Reduction Plan”), which was intended to reduce expenses and reduce its workforce by 1.0 percent. The cost of implementing the 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 third quarter of fiscal 2020. Implementation of the 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 Plan for the three and nine months ended September 26, 2020 were as follows. Three and Nine (In thousands) Beginning balance $ — Provision for restructuring reserves 103 Cash payments made (103 ) Ending balance $ —

Contingencies

Contingencies	9 Months Ended
	Sep. 26, 2020
Commitments and Contingencies Disclosure [Abstract]
Contingencies	16. 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.

Description of Business, Basi_2

Description of Business, Basis of Presentation and Significant Accounting Policy (Policies)	9 Months Ended
	Sep. 26, 2020
Policy Text Block [Abstract]
Government Grants and Credits	Government Grants and Credits The Company generally records grants from governmental agencies related to income as a reduction in operating expense. Grants are recognized when there is reasonable assurance that the Company will comply with the conditions attached to the grant arrangement and the grant will be received. Reimbursements of eligible expenditures pursuant to government assistance programs are recorded as reductions of operating costs when the related costs have been incurred and there is reasonable assurance regarding collection of the claim. Grant claims not settled by the balance sheet date are recorded as receivables, provided their receipt is reasonably assured. The determination of the amount of the claim, and accordingly the receivable amount, requires management to make calculations based on its interpretation of eligible expenditures in accordance with the terms of the programs. The reimbursement claims submitted by the Company are subject to review by the relevant government agencies. In Singapore, Intevac receives government assistance under the Job Support Scheme (“JSS”). 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 research and development (“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.

Revenue (Tables)

Revenue (Tables)	9 Months Ended
	Sep. 26, 2020
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 September 26, 2020 and September 28, 2019 along with the reportable segment for each category. Major Products and Service Lines TFE Three Months Ended Three Months Ended (In thousands) HDD DCP PV Total HDD DCP PV Total Systems, upgrades and spare parts $ 7,601 $ — $ 131 $ 7,732 $ 7,737 $ — $ 8,225 $ 15,962 Field service 1,635 — — 1,635 1,109 — 45 1,154 Total TFE net revenues $ 9,236 $ — $ 131 $ 9,367 $ 8,846 $ — $ 8,270 $ 17,116 Nine Months Ended Nine Months Ended (In thousands) HDD DCP PV Total HDD DCP PV Total Systems, upgrades and spare parts $ 29,189 $ — $ 400 $ 29,589 $ 31,210 $ — $ 14,616 $ 45,826 Field service 4,334 — 2 4,336 3,452 2 45 3,499 Total TFE net revenues $ 33,523 $ — $ 402 $ 33,925 $ 34,662 $ 2 $ 14,661 $ 49,325 Three Months Ended Nine Months Ended Photonics September 26, 2020 September 28, 2019 September 26, 2020 September 28, 2019 (In thousands) Products: Military products $ 4,947 $ 3,320 $ 15,758 $ 8,115 Commercial products 139 81 257 581 Repair and other services 574 573 1,649 1,944 Total Photonics product net revenues 5,660 3,974 17,664 10,640 Technology development: Firm Fixed Price (“FFP”) 5,482 3,218 15,374 7,995 Cost Plus Fixed Fee (“CPFF”) 1,056 1,991 2,285 5,479 Time and materials — — — 2 Total technology development net revenues 6,538 5,209 17,659 13,476 Total Photonics net revenues $ 12,198 $ 9,183 $ 35,323 $ 24,116 Primary Geographical Markets Three Months Ended Three Months Ended September 26, 2020 September 28, 2019 (In thousands) TFE Photonics Total TFE Photonics Total United States $ 1,764 $ 12,079 $ 13,843 $ 478 $ 9,050 $ 9,528 Asia 7,536 — 7,536 16,638 — 16,638 Europe 67 119 186 — 133 133 Total net revenues $ 9,367 $ 12,198 $ 21,565 $ 17,116 $ 9,183 $ 26,299 Nine Months Ended Nine Months Ended September 26, 2020 September 28, 2019 (In thousands) TFE Photonics Total TFE Photonics Total United States $ 2,596 $ 35,060 $ 37,656 $ 995 $ 23,578 $ 24,573 Asia 31,262 — 31,262 48,330 — 48,330 Europe 67 263 330 — 538 538 Total net revenues $ 33,925 $ 35,323 $ 69,248 $ 49,325 $ 24,116 $ 73,441 Timing of Revenue Recognition Three Months Ended Three Months Ended September 26, 2020 September 28, 2019 (In thousands) TFE Photonics Total TFE Photonics Total Products transferred at a point in time $ 9,367 $ 574 $ 9,941 $ 17,116 $ 573 $ 17,689 Products and services transferred over time — 11,624 11,624 — 8,610 8,610 $ 9,367 $ 12,198 $ 21,565 $ 17,116 $ 9,183 $ 26,299 Nine Months Ended Nine Months Ended September 26, 2020 September 28, 2019 (In thousands) TFE Photonics Total TFE Photonics Total Products transferred at a point in time $ 33,925 $ 1,649 $ 35,574 $ 49,325 $ 1,944 $ 51,269 Products and services transferred over time — 33,674 33,674 — 22,172 22,172 $ 33,925 $ 35,323 $ 69,248 $ 49,325 $ 24,116 $ 73,441
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 September 26, 2020: September 26, December 28, Nine Months Change (In thousands) TFE: Contract assets: Accounts receivable, unbilled $ 560 $ 760 $ (200 ) Contract liabilities: Deferred revenue $ 399 $ 320 $ 79 Customer advances 1,051 4,007 (2,956 ) $ 1,450 $ 4,327 $ (2,877 ) Photonics: Contract assets: Accounts receivable, unbilled $ 3,238 $ 3,210 $ 28 Retainage 123 99 24 $ 3,361 $ 3,309 $ 52 Contract liabilities: Deferred revenue $ 31 $ — $ 31

Inventories (Tables)

Inventories (Tables)	9 Months Ended
	Sep. 26, 2020
Inventory Disclosure [Abstract]
Summary of Inventories	Inventories are stated at the lower of average cost or net realizable value and consist of the following: September 26, December 28, (In thousands) Raw materials $ 11,166 $ 15,286 Work-in-progress 5,732 4,748 Finished goods 6,740 4,873 $ 23,638 $ 24,907

Equity-Based Compensation (Tabl

Equity-Based Compensation (Tables)	9 Months Ended
	Sep. 26, 2020
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 September 26, 2020 and September 28, 2019 was as follows: Three Months Ended Nine Months Ended September 26, September 28, September 26, September 28, (In thousands) Equity-based compensation by type of award: Stock options $ 47 $ 213 $ 411 $ 610 RSUs 495 375 1,311 1,018 ESPP awards 316 163 464 632 Total equity-based compensation $ 858 $ 751 $ 2,186 $ 2,260
Summary of Stock Option Activity	Option activity as of September 26, 2020 and changes during the nine months ended September 26, 2020 were as follows: Shares Weighted-Average Options outstanding at December 28, 2019 2,096,610 $ 6.63 Options granted 6,000 $ 4.88 Options cancelled and forfeited (193,461 ) $ 6.68 Options exercised (61,722 ) $ 4.77 Options outstanding at September 26, 2020 1,847,427 $ 6.68 Options exercisable at September 26, 2020 1,395,582 $ 6.80
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 September 26, September 28, September 26, September 28, Stock Options: Weighted-average fair value of grants per share $ — $ 1.84 $ 1.82 $ 2.05 Expected volatility — 43.87 % 46.04 % 43.22 % Risk-free interest rate — 1.57 % 0.44 % 1.86 % Expected term of options (in years) — 4.32 4.39 4.56 Dividend yield — None None None Three Months Ended Nine Months Ended September 26, September 28, September 26, September 28, Stock Purchase Rights: Weighted-average fair value of grants per share $ 2.20 $ 1.45 $ 2.20 $ 1.73 Expected volatility 51.72 % 38.27 % 51.49 % 45.81 % Risk-free interest rate 0.12 % 1.85 % 0.14 % 2.28 % Expected term of purchase rights (in years) 1.26 0.75 1.24 0.91 Dividend yield None None None None
Summary of Restricted Stock Units Activity	RSU activity as of September 26, 2020 and changes during the nine months ended September 26, 2020 were as follows: Shares Weighted-Average Grant Date Fair Value Non-vested 553,355 $ 6.15 Granted 658,090 $ 4.85 Vested (221,483 ) $ 6.51 Cancelled and forfeited (35,815 ) $ 6.05 Non-vested 954,147 $ 5.17
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 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
Performance Stock Options (PSO's)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee Stock Options Weighted-Average Assumptions	Intevac estimated the weighted-average fair value of PSOs using the following weighted-average assumptions: Nine Months Ended Weighted-average fair value of grants per share $ 1.75 Expected volatility 43.43 % Risk free interest rate 1.96 % Expected term (in years) 4.60 Dividend yield None

Purchased Intangible Assets (Ta

Purchased Intangible Assets (Tables)	9 Months Ended
	Sep. 26, 2020
Goodwill and Intangible Assets Disclosure [Abstract]
Information Regarding Other Acquisition Related Intangible Assets	Details of finite-lived intangible assets by segment as of September 26, 2020 are as follows. September 26, 2020 Gross Accumulated Net (In thousands) TFE $ 7,172 $ (7,172 ) $ — Photonics 1,215 (1,211 ) 4 $ 8,387 $ (8,383 ) $ 4

Acquisition-Related Contingen_2

Acquisition-Related Contingent Consideration (Tables)	9 Months Ended
	Sep. 26, 2020
Business Combinations [Abstract]
Reconciliation of Change in Fair Value Measurement of Contingent Consideration Liability	The following table represents a reconciliation of the change in the fair value measurement of the contingent consideration liability for the nine months ended September 28, 2019 (in thousands): Nine Months Ended September 28, 2019 Opening balance $ 223 Changes in fair value 7 Cash payments made (230 ) Closing balance $ —

Warranty (Tables)

Warranty (Tables)	9 Months Ended
	Sep. 26, 2020
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 September 26, 2020 and September 28, 2019: Three Months Ended Nine Months Ended September 26, 2020 September 28, 2019 September 26, 2020 September 28, 2019 (In thousands) Opening balance $ 662 $ 948 $ 1,022 $ 997 Expenditures incurred under warranties (89 ) (167 ) (398 ) (592 ) Accruals for product warranties issued during the reporting period 39 427 198 829 Adjustments to previously existing warranty accruals (57 ) (72 ) (267 ) (98 ) Closing balance $ 555 $ 1,136 $ 555 $ 1,136 The following table displays the balance sheet classification of the warranty provision account at September 26, 2020 and at December 28, 2019: September 26, December 28, 2020 2019 (In thousands) Other accrued liabilities $ 425 $ 846 Other long-term liabilities 130 176 Total warranty provision $ 555 $ 1,022

Cash, Cash Equivalents and In_2

Cash, Cash Equivalents and Investments (Tables)	9 Months Ended
	Sep. 26, 2020
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: September 26, 2020 Amortized Cost Unrealized Unrealized Fair Value (In thousands) Cash and cash equivalents: Cash $ 23,829 $ — $ — $ 23,829 Money market funds 3,416 — — 3,416 Total cash and cash equivalents $ 27,245 $ — $ — $ 27,245 Short-term investments: Certificates of deposit $ 7,450 $ 7 $ — $ 7,457 Commercial paper 499 1 — 500 Corporate bonds and medium-term notes 3,842 27 — 3,869 U.S. treasury and agency securities 6,481 35 — 6,516 Total short-term investments $ 18,272 $ 70 $ — $ 18,342 Long-term investments: Certificates of deposit $ 500 $ — $ — $ 500 Corporate bonds and medium-term notes 2,572 2 — 2,574 Total long-term investments $ 3,072 $ 2 $ — $ 3,074 Total cash, cash equivalents, and investments $ 48,589 $ 72 $ — $ 48,661 December 28, 2019 Amortized Cost Unrealized Unrealized Fair Value (In thousands) Cash and cash equivalents: Cash $ 16,512 $ — $ — $ 16,512 Money market funds 3,255 — — 3,255 Total cash and cash equivalents $ 19,767 $ — $ — $ 19,767 Short-term investments: Certificates of deposit $ 3,000 $ 1 $ — $ 3,001 Commercial paper 1,891 2 — 1,893 Corporate bonds and medium-term notes 6,383 25 — 6,408 U.S. treasury and agency securities 5,417 1 — 5,418 Total short-term investments $ 16,691 $ 29 $ — $ 16,720 Long-term investments: Certificates of deposit $ 499 $ 1 $ — $ 500 Corporate bonds and medium-term notes 2,530 12 — 2,542 U.S. treasury and agency securities 2,494 1 — 2,495 Total long-term investments $ 5,523 $ 14 $ — $ 5,537 Total cash, cash equivalents, and investments $ 41,981 $ 43 $ — $ 42,024
Contractual Maturities of Available-for-Sale Securities	The contractual maturities of available-for-sale September 26, 2020 Amortized Fair Value (In thousands) Due in one year or less $ 21,688 $ 21,758 Due after one through two years 3,072 3,074 $ 24,760 $ 24,832
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 Total Level 1 Level 2 (In thousands) Recurring fair value measurements: Available-for-sale Money market funds $ 3,416 $ 3,416 $ — U.S. treasury and agency securities 6,516 6,516 — Certificates of deposit 7,957 — 7,957 Commercial paper 500 — 500 Corporate bonds and medium-term notes 6,443 — 6,443 Total recurring fair value measurements $ 24,832 $ 9,932 $ 14,900

Derivative Instruments (Tables)

Derivative Instruments (Tables)	9 Months Ended
	Sep. 26, 2020
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 September 26, 2020 and December 28, 2019: Notional Amounts Derivative Liabilities Derivative Instrument September 26 December 28, September 26, December 28, Balance Fair Balance Fair (In thousands) Undesignated Hedges: Forward Foreign Currency Contracts $ 871 $ 1,035 (a) $ 5 (a) $ 4 Total Hedges $ 871 $ 1,035 $ 5 $ 4 (a) Other accrued liabilities

Equity (Tables)

Equity (Tables)	9 Months Ended
	Sep. 26, 2020
Equity [Abstract]
Schedule of Changes in Stockholders' Equity	The changes in stockholders’ equity by component for the three and nine months ended September 26, 2020 and September 28, 2019, are as follows (in thousands): 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 Three months ended September 28, 2019 Common Paid-in Treasury Accumulated Accumulated Total Balance at June 29, 2019 $ 185,489 $ (29,089 ) $ 455 $ (68,508 ) $ 88,347 Common stock issued under employee plans 749 — — — 749 Shares withheld for net share settlement of RSUs (28 ) — — — (28 ) Equity-based compensation expense 751 — — — 751 Net loss — — — (480 ) (480 ) Other comprehensive loss — — (84 ) — (84 ) Common stock repurchases — (69 ) — — (69 ) Balance at September 28, 2019 $ 186,961 $ (29,158 ) $ 371 $ (68,988 ) $ 89,186 Nine months ended September 28, 2019 Common Paid-in Treasury Accumulated Accumulated Total Balance at December 29, 2018 $ 183,227 $ (29,047 ) $ 378 $ (64,934 ) $ 89,624 Common stock issued under employee plans 1,770 — — — 1,770 Shares withheld for net share settlement of RSUs (296 ) — — — (296 ) Equity-based compensation expense 2,260 — — — 2,260 Net loss — — — (4,054 ) (4,054 ) Other comprehensive loss — — (7 ) — (7 ) Common stock repurchases — (111 ) — — (111 ) Balance at September 28, 2019 $ 186,961 $ (29,158 ) $ 371 $ (68,988 ) $ 89,186
Changes in Accumulated Other Comprehensive Income by Component	The changes in accumulated other comprehensive income by component for the three and nine months ended September 26, 2020 and September 28, 2019, are as follows. Three Months Ended Nine Months Ended September 26, 2020 Foreign 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 Three Months Ended Nine Months Ended September 28, 2019 Foreign Unrealized available-for-sale Total Foreign Unrealized available-for-sale Total (In thousands) Beginning balance $ 405 $ 50 $ 455 $ 405 $ (27 ) $ 378 Other comprehensive income (loss) before reclassification (87 ) 3 (84 ) (87 ) 80 (7 ) Amounts reclassified from other comprehensive income (loss) — — — — — — Net current-period other comprehensive loss (87 ) 3 (84 ) (87 ) 80 (7 ) Ending balance $ 318 $ 53 $ 371 $ 318 $ 53 $ 371
Schedule of Stock Repurchases	The following table summarizes Intevac’s stock repurchases: Three Months Ended Nine Months Ended September 26, 2020 September 28, 2019 September 26, 2020 September 28, 2019 (In thousands, except per share amounts) Shares of common stock repurchased — 15 98 24 Cost of stock repurchased $ — $ 69 $ 393 $ 111 Average price paid per share $ — $ 4.65 $ 3.97 $ 4.67

Net Loss Per Share (Tables)

Net Loss Per Share (Tables)	9 Months Ended
	Sep. 26, 2020
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 September 26, 2020 and September 28, 2019: Three Months Ended Nine Months Ended September 26, September 28, September 26, September 28, (In thousands, except per share amounts) Net loss $ (357 ) $ (480 ) $ (57 ) $ (4,054 ) Weighted-average shares – basic 23,771 23,130 23,605 22,992 Effect of dilutive potential common shares — — — — Weighted-average shares – diluted 23,771 23,130 23,605 22,992 Net loss per share – basic $ (0.02 ) $ (0.02 ) $ (0.00 ) $ (0.18 ) Net loss per share – diluted $ (0.02 ) $ (0.02 ) $ (0.00 ) $ (0.18 )

Segment Reporting (Tables)

Segment Reporting (Tables)	9 Months Ended
	Sep. 26, 2020
Segment Reporting [Abstract]
Information for Each Reportable Segment	Information for each reportable segment for the three and nine months ended September 26, 2020 and September 28, 2019 is as follows: Net Revenues Three Months Ended Nine Months Ended September 26, 2020 September 28, 2019 September 26, 2020 September 28, 2019 (In thousands) TFE $ 9,367 $ 17,116 $ 33,925 $ 49,325 Photonics 12,198 9,183 35,323 24,116 Total segment net revenues $ 21,565 $ 26,299 $ 69,248 $ 73,441 Operating Income (Loss) Three Months Ended Nine Months Ended September 26, 2020 September 28, 2019 September 26, 2020 September 28, 2019 (In thousands) TFE $ (1,661 ) $ (1,542 ) $ (4,366 ) $ (3,434 ) Photonics 3,032 2,268 9,480 3,114 Total segment operating income (loss) 1,371 726 5,114 (320 ) Unallocated costs (1,519 ) (1,159 ) (4,258 ) (3,038 ) Income (loss) from operations (148 ) (433 ) 856 (3,358 ) Interest income and other income (expense), net 8 126 212 448 Income (loss) before provision for income taxes $ (140 ) $ (307 ) $ 1,068 $ (2,910 )
Segment Assets	Total assets for each reportable segment as of September 26, 2020 and December 28, 2019 are as follows: Assets September 26, December 28, (In thousands) TFE $ 45,819 $ 51,153 Photonics 19,049 22,071 Total segment assets 64,868 73,224 Cash, cash equivalents and investments 48,661 42,024 Restricted cash 787 787 Deferred income taxes 5,736 6,252 Other current assets 1,145 752 Common property, plant and equipment 1,461 1,307 Common operating lease right-of-use 1,711 1,898 Other assets — 78 Consolidated total assets $ 124,369 $ 126,322

Restructuring Charges (Tables)

Restructuring Charges (Tables)	9 Months Ended
	Sep. 26, 2020
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 Plan for the three and nine months ended September 26, 2020 were as follows. Three and Nine (In thousands) Beginning balance $ — Provision for restructuring reserves 103 Cash payments made (103 ) Ending balance $ —

Description of Business, Basi_3

Description of Business, Basis of Presentation and Significant Accounting Policy - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 26, 2020	Sep. 26, 2020
Description of Business and Basis of Presentation and Significant Accounting Policies [Line Items]
Proceeds from government grants	$ 124	$ 434
Cost of Sales [Member] | Grant [Member]
Description of Business and Basis of Presentation and Significant Accounting Policies [Line Items]
Proceeds from government grants	72	252
Research and Development Expense [Member] | Grant [Member]
Description of Business and Basis of Presentation and Significant Accounting Policies [Line Items]
Proceeds from government grants	20	68
Selling, General and Administrative Expenses [Member] | Grant [Member]
Description of Business and Basis of Presentation and Significant Accounting Policies [Line Items]
Proceeds from government grants	$ 32	$ 114

Revenue -Disaggregation of Reve

Revenue -Disaggregation of Revenue from Contracts with Customers (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 26, 2020	Sep. 28, 2019	Sep. 26, 2020	Sep. 28, 2019
Disaggregation of Revenue [Line Items]
Total net revenues	$ 21,565	$ 26,299	$ 69,248	$ 73,441
TFE
Disaggregation of Revenue [Line Items]
Total net revenues	9,367	17,116	33,925	49,325
TFE | Systems, Upgrades and Spare Parts
Disaggregation of Revenue [Line Items]
Total net revenues	7,732	15,962	29,589	45,826
TFE | Field Service
Disaggregation of Revenue [Line Items]
Total net revenues	1,635	1,154	4,336	3,499
Photonics
Disaggregation of Revenue [Line Items]
Total net revenues	12,198	9,183	35,323	24,116
HDD | TFE
Disaggregation of Revenue [Line Items]
Total net revenues	9,236	8,846	33,523	34,662
HDD | TFE | Systems, Upgrades and Spare Parts
Disaggregation of Revenue [Line Items]
Total net revenues	7,601	7,737	29,189	31,210
HDD | TFE | Field Service
Disaggregation of Revenue [Line Items]
Total net revenues	1,635	1,109	4,334	3,452
DCP | TFE
Disaggregation of Revenue [Line Items]
Total net revenues				2
DCP | TFE | Systems, Upgrades and Spare Parts
Disaggregation of Revenue [Line Items]
Total net revenues
DCP | TFE | Field Service
Disaggregation of Revenue [Line Items]
Total net revenues				2
PV | TFE
Disaggregation of Revenue [Line Items]
Total net revenues	131	8,270	402	14,661
PV | TFE | Systems, Upgrades and Spare Parts
Disaggregation of Revenue [Line Items]
Total net revenues	131	8,225	400	14,616
PV | TFE | Field Service
Disaggregation of Revenue [Line Items]
Total net revenues		45	2	45
Military Products | Photonics
Disaggregation of Revenue [Line Items]
Total net revenues	4,947	3,320	15,758	8,115
Commercial Products | Photonics
Disaggregation of Revenue [Line Items]
Total net revenues	139	81	257	581
Repair and Other Services | Photonics
Disaggregation of Revenue [Line Items]
Total net revenues	574	573	1,649	1,944
Product | Photonics
Disaggregation of Revenue [Line Items]
Total net revenues	5,660	3,974	17,664	10,640
Firm Fixed Price [Member] | Photonics
Disaggregation of Revenue [Line Items]
Total net revenues	5,482	3,218	15,374	7,995
Cost Plus Fixed Fee [Member] | Photonics
Disaggregation of Revenue [Line Items]
Total net revenues	1,056	1,991	2,285	5,479
Times and Materials | Photonics
Disaggregation of Revenue [Line Items]
Total net revenues				2
Technology Development | Photonics
Disaggregation of Revenue [Line Items]
Total net revenues	$ 6,538	$ 5,209	$ 17,659	$ 13,476

Revenue - Primary Geography Mar

Revenue - Primary Geography Markets (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 26, 2020	Sep. 28, 2019	Sep. 26, 2020	Sep. 28, 2019
Disaggregation of Revenue [Line Items]
Total net revenues	$ 21,565	$ 26,299	$ 69,248	$ 73,441
Products Transferred at a Point in Time
Disaggregation of Revenue [Line Items]
Total net revenues	9,941	17,689	35,574	51,269
Products and Services Transferred Over Time
Disaggregation of Revenue [Line Items]
Total net revenues	11,624	8,610	33,674	22,172
United States
Disaggregation of Revenue [Line Items]
Total net revenues	13,843	9,528	37,656	24,573
Asia
Disaggregation of Revenue [Line Items]
Total net revenues	7,536	16,638	31,262	48,330
Europe
Disaggregation of Revenue [Line Items]
Total net revenues	186	133	330	538
TFE
Disaggregation of Revenue [Line Items]
Total net revenues	9,367	17,116	33,925	49,325
TFE | Products Transferred at a Point in Time
Disaggregation of Revenue [Line Items]
Total net revenues	9,367	17,116	33,925	49,325
TFE | United States
Disaggregation of Revenue [Line Items]
Total net revenues	1,764	478	2,596	995
TFE | Asia
Disaggregation of Revenue [Line Items]
Total net revenues	7,536	16,638	31,262	48,330
TFE | Europe
Disaggregation of Revenue [Line Items]
Total net revenues	67		67
Photonics
Disaggregation of Revenue [Line Items]
Total net revenues	12,198	9,183	35,323	24,116
Photonics | Products Transferred at a Point in Time
Disaggregation of Revenue [Line Items]
Total net revenues	574	573	1,649	1,944
Photonics | Products and Services Transferred Over Time
Disaggregation of Revenue [Line Items]
Total net revenues	11,624	8,610	33,674	22,172
Photonics | United States
Disaggregation of Revenue [Line Items]
Total net revenues	12,079	9,050	35,060	23,578
Photonics | Asia
Disaggregation of Revenue [Line Items]
Total net revenues
Photonics | Europe
Disaggregation of Revenue [Line Items]
Total net revenues	$ 119	$ 133	$ 263	$ 538

Revenue - Changes in Contract A

Revenue - Changes in Contract Assets and Contract Liabilities (Detail) - USD ($) $ in Thousands	9 Months Ended
	Sep. 26, 2020	Dec. 28, 2019
TFE
Contract liabilities:
Contract liabilities	$ 1,450	$ 4,327
Contract liabilities:
Change in contract liabilities	(2,877)
TFE | Accounts Receivable, Unbilled
Contract assets:
Contract assets	560	760
Contract assets:
Change in contract assets	(200)
TFE | Deferred Revenue
Contract liabilities:
Contract liabilities	399	320
Contract liabilities:
Change in contract liabilities	79
TFE | Customer Advances
Contract liabilities:
Contract liabilities	1,051	4,007
Contract liabilities:
Change in contract liabilities	(2,956)
Photonics
Contract assets:
Contract assets	3,361	3,309
Contract assets:
Change in contract assets	52
Photonics | Accounts Receivable, Unbilled
Contract assets:
Contract assets	3,238	3,210
Contract assets:
Change in contract assets	28
Photonics | Deferred Revenue
Contract liabilities:
Contract liabilities	31
Contract liabilities:
Change in contract liabilities	31
Photonics | Retainage
Contract assets:
Contract assets	123	$ 99
Contract assets:
Change in contract assets	$ 24

Revenue - Additional Informatio

Revenue - Additional Information (Detail) $ in Thousands	9 Months Ended
	Sep. 26, 2020USD ($)Installment
Revenue From Contract With Customers [Line Items]
Revenue remaining performance obligation	$ 63,300
TFE
Revenue From Contract With Customers [Line Items]
Revenue remaining performance obligation	$ 18,100
TFE | Accounts Receivable, Unbilled
Revenue From Contract With Customers [Line Items]
Number of installments | Installment	3
Change in contract assets	$ (200)
TFE | Customer Advances
Revenue From Contract With Customers [Line Items]
Contract with customer liability revenue recognized	4,000
TFE | Deferred Revenue
Revenue From Contract With Customers [Line Items]
Contract with customer liability revenue recognized	119
Photonics
Revenue From Contract With Customers [Line Items]
Change in contract assets	52
Revenue remaining performance obligation	45,200
Photonics | Accounts Receivable, Unbilled
Revenue From Contract With Customers [Line Items]
Change in contract assets	$ 28

Revenue - Additional Informat_2

Revenue - Additional Information (Detail 1)	Sep. 26, 2024	Sep. 26, 2023	Sep. 26, 2022	Sep. 26, 2021	Sep. 26, 2020
Revenue From Contract With Customers [Line Items]
Revenue, remaining performance obligation, percentage					42.00%
Scenario Forecast
Revenue From Contract With Customers [Line Items]
Revenue, remaining performance obligation, percentage	1.00%	9.00%	18.00%	30.00%

Inventories - Inventories State

Inventories - Inventories Stated at Lower of Average Cost or Net Realizable Value (Detail) - USD ($) $ in Thousands	Sep. 26, 2020	Dec. 28, 2019
Inventory Disclosure [Abstract]
Raw materials	$ 11,166	$ 15,286
Work-in-progress	5,732	4,748
Finished goods	6,740	4,873
Inventories	$ 23,638	$ 24,907

Equity-Based Compensation - Add

Equity-Based Compensation - Additional information (Detail) - USD ($)	Aug. 01, 2020	May 31, 2020	Jun. 29, 2019	Sep. 26, 2020
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%
Options granted under performance stock options				6,000
Stock issued under Employee Stock Purchase Plans				392,088
Employee stock obligation amount	$ 25,000
Chief Executive Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options granted under performance stock options			37,500
Performance stock option vesting period				1 year 1 month 6 days
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		100.00%
Granted		109,465		658,090

Equity-Based Compensation - Eff

Equity-Based Compensation - Effect of Recording Equity-Based Compensation (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 26, 2020	Sep. 28, 2019	Sep. 26, 2020	Sep. 28, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity-based compensation	$ 858	$ 751	$ 2,186	$ 2,260
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity-based compensation	47	213	411	610
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity-based compensation	495	375	1,311	1,018
ESPP awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity-based compensation	$ 316	$ 163	$ 464	$ 632

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
	Sep. 26, 2020	Sep. 28, 2019	Sep. 26, 2020	Sep. 28, 2019
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average fair value of grants per share	$ 0	$ 1.84	$ 1.82	$ 2.05
Expected volatility	0.00%	43.87%	46.04%	43.22%
Risk free interest rate	0.00%	1.57%	0.44%	1.86%
Expected term of options (in years)		4 years 3 months 25 days	4 years 4 months 20 days	4 years 6 months 21 days
Dividend yield	0.00%	0.00%	0.00%	0.00%
Stock Purchase Rights
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average fair value of grants per share	$ 2.20	$ 1.45	$ 2.20	$ 1.73
Expected volatility	51.72%	38.27%	51.49%	45.81%
Risk free interest rate	0.12%	1.85%	0.14%	2.28%
Expected term of options (in years)	1 year 3 months 3 days	9 months	1 year 2 months 26 days	10 months 28 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) - $ / shares	9 Months Ended
	Sep. 26, 2020	Sep. 28, 2019
Performance Stock Options (PSO's)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average fair value of grants per share		$ 1.75
Expected volatility		43.43%
Risk free interest rate		1.96%
Expected term (in years)		4 years 7 months 6 days
Dividend yield		0.00%
Performance Based Restricted Stock Units (PRSU's)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average fair value of grants per share	$ 3.16
Expected volatility	46.70%
Risk free interest rate	0.25%
Dividend yield	0.00%

Equity-Based Compensation - Opt

Equity-Based Compensation - Option Activity and Changes (Detail)	9 Months Ended
	Sep. 26, 2020$ / sharesshares
Shares
Options outstanding at December 28, 2019 | shares	2,096,610
Options granted | shares	6,000
Options cancelled and forfeited | shares	(193,461)
Options exercised | shares	(61,722)
Options outstanding at September 26, 2020 | shares	1,847,427
Options exercisable at September 26, 2020 | shares	1,395,582
Weighted-Average Exercise Price
Options outstanding at December 28, 2019 | $ / shares	$ 6.63
Options granted | $ / shares	4.88
Options cancelled and forfeited | $ / shares	6.68
Options exercised | $ / shares	4.77
Options outstanding at September 26, 2020 | $ / shares	6.68
Options exercisable at September 26, 2020 | $ / shares	$ 6.80

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, 2020	Sep. 26, 2020
Shares
Non-vested RSUs at December 28, 2019		553,355
Granted	109,465	658,090
Vested		(221,483)
Cancelled		(35,815)
Non-vested RSUs at September 26, 2020		954,147
Weighted Average Grant Date Fair Value
Non-vested RSUs at December 28, 2019		$ 6.15
Granted		4.85
Vested		6.51
Cancelled		6.05
Non-vested RSUs at September 26, 2020		$ 5.17

Purchased Intangible Assets - A

Purchased Intangible Assets - Additional Information (Detail)	3 Months Ended	9 Months Ended
	Sep. 26, 2020USD ($)	Sep. 26, 2020USD ($)
Business Combination Segment Allocation [Line Items]
Total amortization expense of finite-lived intangibles	$ 11,000	$ 270,000
Purchased Intangible Assets, future amortization expense	$ 4,000	$ 4,000

Purchased Intangible Assets - D

Purchased Intangible Assets - Details of Finite-lived Intangible Assets by Segment (Detail) $ in Thousands	Sep. 26, 2020USD ($)
Finite-Lived Intangible Assets [Line Items]
Finite Lived, Gross Carrying Amount	$ 8,387
Accumulated Amortization	(8,383)
Finite Lived, Net Carrying Amount	4
TFE
Finite-Lived Intangible Assets [Line Items]
Finite Lived, Gross Carrying Amount	7,172
Accumulated Amortization	(7,172)
Finite Lived, Net Carrying Amount	0
Photonics
Finite-Lived Intangible Assets [Line Items]
Finite Lived, Gross Carrying Amount	1,215
Accumulated Amortization	(1,211)
Finite Lived, Net Carrying Amount	$ 4

Acquisition-Related Contingen_3

Acquisition-Related Contingent Consideration - Additional Information (Detail) $ in Millions	Nov. 19, 2010USD ($)
Solar Implant Technologies | Revenue Earnout
Business Acquisition [Line Items]
Maximum amount of cash potentially earned in contingent compensation arrangements	$ 9

Acquisition-Related Contingen_4

Acquisition-Related Contingent Consideration - Reconciliation of Change in Fair Value Measurement of Contingent Consideration Liability (Detail) $ in Thousands	9 Months Ended
	Sep. 28, 2019USD ($)
Business Combinations [Abstract]
Beginning balance	$ 223
Changes in fair value	7
Cash payments made	(230)
Ending balance

Warranty - Additional Informati

Warranty - Additional Information (Detail)	9 Months Ended
	Sep. 26, 2020
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
	Sep. 26, 2020	Sep. 28, 2019	Sep. 26, 2020	Sep. 28, 2019
Guarantees [Abstract]
Opening balance	$ 662	$ 948	$ 1,022	$ 997
Expenditures incurred under warranties	(89)	(167)	(398)	(592)
Accruals for product warranties issued during the reporting period	39	427	198	829
Adjustments to previously existing warranty accruals	(57)	(72)	(267)	(98)
Closing balance	$ 555	$ 1,136	$ 555	$ 1,136

Warranty - Balance Sheet Classi

Warranty - Balance Sheet Classification of Warranty Provision Account (Detail) - USD ($) $ in Thousands	Sep. 26, 2020	Jun. 27, 2020	Dec. 28, 2019	Sep. 28, 2019	Jun. 29, 2019	Dec. 29, 2018
Guarantees [Abstract]
Other accrued liabilities	$ 425		$ 846
Other long-term liabilities	130		176
Total warranty provision	$ 555	$ 662	$ 1,022	$ 1,136	$ 948	$ 997

Guarantees - Additional Informa

Guarantees - Additional Information (Detail)	Sep. 26, 2020USD ($)
Guarantees [Abstract]
Letters of credit and bank guarantees outstanding, amount	$ 787,000
Letters of credit and bank guarantees collateralized by restricted cash	$ 787,000

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	Sep. 26, 2020	Dec. 28, 2019
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 48,589	$ 41,981
Unrealized Holding Gains	72	43
Unrealized Holding Losses		0
Fair Value	48,661	42,024
Cash and Cash Equivalents
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	27,245	19,767
Fair Value	27,245	19,767
Cash and Cash Equivalents | Cash
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	23,829	16,512
Fair Value	23,829	16,512
Cash and Cash Equivalents | Money market funds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	3,416	3,255
Fair Value	3,416	3,255
Short-term Investments
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	18,272	16,691
Unrealized Holding Gains	70	29
Unrealized Holding Losses		0
Fair Value	18,342	16,720
Short-term Investments | Corporate bonds and medium-term notes
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	3,842	6,383
Unrealized Holding Gains	27	25
Unrealized Holding Losses		0
Fair Value	3,869	6,408
Short-term Investments | U.S. treasury and agency securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	6,481	5,417
Unrealized Holding Gains	35	1
Fair Value	6,516	5,418
Short-term Investments | Certificates of deposit
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	7,450	3,000
Unrealized Holding Gains	7	1
Unrealized Holding Losses		0
Fair Value	7,457	3,001
Short-term Investments | Commercial paper
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	499	1,891
Unrealized Holding Gains	1	2
Unrealized Holding Losses		0
Fair Value	500	1,893
Long-term Investments
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	3,072	5,523
Unrealized Holding Gains	2	14
Unrealized Holding Losses		0
Fair Value	3,074	5,537
Long-term Investments | Corporate bonds and medium-term notes
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	2,572	2,530
Unrealized Holding Gains	2	12
Unrealized Holding Losses		0
Fair Value	2,574	2,542
Long-term Investments | U.S. treasury and agency securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost		2,494
Unrealized Holding Gains		1
Unrealized Holding Losses		0
Fair Value		2,495
Long-term Investments | Certificates of deposit
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	500	499
Unrealized Holding Gains		1
Unrealized Holding Losses
Fair Value	$ 500	$ 500

Cash, Cash Equivalents and In_4

Cash, Cash Equivalents and Investments - Contractual Maturities of Available-For-Sale Securities (Detail) $ in Thousands	Sep. 26, 2020USD ($)
Investments Debt And Equity Securities [Abstract]
Amortized Cost, Due in one year or less	$ 21,688
Amortized Cost, Due after one through five years	3,072
Amortized Cost	24,760
Fair Value, Due in one year or less	21,758
Fair Value, Due after one through five years	3,074
Fair Value	$ 24,832

Cash, Cash Equivalents and In_5

Cash, Cash Equivalents and Investments - Fair Value Hierarchy of Available-for-Sale Securities Measured at Fair Value on Recurring Basis (Detail) $ in Thousands	Sep. 26, 2020USD ($)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total recurring fair value measurements	$ 24,832
Fair Value, Measurements, Recurring
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total recurring fair value measurements	24,832
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	3,416
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	7,957
Fair Value, Measurements, Recurring | Commercial paper
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total recurring fair value measurements	500
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	6,516
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	6,443
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	9,932
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	3,416
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	6,516
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	14,900
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	7,957
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	500
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	$ 6,443

Derivative Instruments - Additi

Derivative Instruments - Additional Information (Detail)	9 Months Ended
	Sep. 26, 2020
Derivative Instrument Detail [Abstract]
Maturity of foreign currency derivative	30 days

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	Sep. 26, 2020	Dec. 28, 2019
Derivatives, Fair Value [Line Items]
Notional Amounts	$ 871	$ 1,035
Derivative Liabilities	5	4
Forward Foreign Currency Contracts
Derivatives, Fair Value [Line Items]
Notional Amounts	871	1,035
Derivative Liabilities	$ 5	$ 4

Equity - Schedule of Changes in

Equity - Schedule of Changes in Stockholders' Equity (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 26, 2020	Sep. 28, 2019	Sep. 26, 2020	Sep. 28, 2019
Class of Stock [Line Items]
Beginning balance	$ 97,655	$ 88,347	$ 95,793	$ 89,624
Common stock issued under employee plans	871	749	1,865	1,770
Shares withheld for net share settlement of RSUs	(19)	(28)	(364)	(296)
Equity-based compensation expense	858	751	2,186	2,260
Net income (loss)	(357)	(480)	(57)	(4,054)
Other comprehensive loss	100	(84)	78	(7)
Common stock repurchases	0	(69)	(393)	(111)
Ending balance	99,108	89,186	99,108	89,186
Common Stock and Additional Paid-in Capital
Class of Stock [Line Items]
Beginning balance	190,290	185,489	188,313	183,227
Common stock issued under employee plans	871	749	1,865	1,770
Shares withheld for net share settlement of RSUs	(19)	(28)	(364)	(296)
Equity-based compensation expense	858	751	2,186	2,260
Ending balance	192,000	186,961	192,000	186,961
Treasury Stock
Class of Stock [Line Items]
Beginning balance	(29,551)	(29,089)	(29,158)	(29,047)
Common stock repurchases		(69)	(393)	(111)
Ending balance	(29,551)	(29,158)	(29,551)	(29,158)
Accumulated Other Comprehensive Income
Class of Stock [Line Items]
Beginning balance	402	455	424	378
Other comprehensive loss	100	(84)	78	(7)
Ending balance	502	371	502	371
Accumulated Deficit
Class of Stock [Line Items]
Beginning balance	(63,486)	(68,508)	(63,786)	(64,934)
Net income (loss)	(357)	(480)	(57)	(4,054)
Ending balance	$ (63,843)	$ (68,988)	$ (63,843)	$ (68,988)

Equity - Changes in Accumulated

Equity - Changes in Accumulated Other Comprehensive Income by Component (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 26, 2020	Sep. 28, 2019	Sep. 26, 2020	Sep. 28, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	$ 97,655	$ 88,347	$ 95,793	$ 89,624
Other comprehensive income (loss), net of tax	100	(84)	78	(7)
Ending balance	99,108	89,186	99,108	89,186
Foreign currency
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	306	405	381	405
Other comprehensive income (loss) before reclassification	124	(87)	49	(87)
Other comprehensive income (loss), net of tax	124	(87)	49	(87)
Ending balance	430	318	430	318
Unrealized holding gains (losses) on available- for-sale investments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	96	50	43	(27)
Other comprehensive income (loss) before reclassification	(24)	3	29	80
Other comprehensive income (loss), net of tax	(24)	3	29	80
Ending balance	72	53	72	53
Accumulated Other Comprehensive Income
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	402	455	424	378
Other comprehensive income (loss) before reclassification	100	(84)	78	(7)
Other comprehensive income (loss), net of tax	100	(84)	78	(7)
Ending balance	$ 502	$ 371	$ 502	$ 371

Equity - Additional Information

Equity - Additional Information (Detail) - USD ($) $ in Millions	Aug. 15, 2018	Sep. 26, 2020	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 Stock Repu

Equity - Schedule of Stock Repurchases (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 26, 2020	Sep. 28, 2019	Sep. 26, 2020	Sep. 28, 2019
Equity [Abstract]
Shares of common stock repurchased	0	15	98	24
Cost of stock repurchased	$ 0	$ 69	$ 393	$ 111
Average price paid per share	$ 0	$ 4.65	$ 3.97	$ 4.67

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
	Sep. 26, 2020	Sep. 28, 2019	Sep. 26, 2020	Sep. 28, 2019
Earnings Per Share [Abstract]
Net loss	$ (357)	$ (480)	$ (57)	$ (4,054)
Weighted-average shares – basic	23,771	23,130	23,605	22,992
Effect of dilutive potential common shares	0	0	0	0
Weighted-average shares – diluted	23,771	23,130	23,605	22,992
Net loss per share – basic	$ (0.02)	$ (0.02)	$ 0	$ (0.18)
Net loss per share – diluted	$ (0.02)	$ (0.02)	$ 0	$ (0.18)

Segment Reporting - Additional

Segment Reporting - Additional Information (Detail)	9 Months Ended
	Sep. 26, 2020Segment
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
	Sep. 26, 2020	Sep. 28, 2019	Sep. 26, 2020	Sep. 28, 2019
Segment Reporting Information [Line Items]
Total segment net revenues	$ 21,565	$ 26,299	$ 69,248	$ 73,441
Operating income (loss)	(148)	(433)	856	(3,358)
Interest income	8	126	212	448
Income (loss) before provision for income taxes	(140)	(307)	1,068	(2,910)
TFE
Segment Reporting Information [Line Items]
Total segment net revenues	9,367	17,116	33,925	49,325
Photonics
Segment Reporting Information [Line Items]
Total segment net revenues	12,198	9,183	35,323	24,116
Operating Segments
Segment Reporting Information [Line Items]
Operating income (loss)	1,371	726	5,114	(320)
Operating Segments | TFE
Segment Reporting Information [Line Items]
Operating income (loss)	(1,661)	(1,542)	(4,366)	(3,434)
Operating Segments | Photonics
Segment Reporting Information [Line Items]
Operating income (loss)	3,032	2,268	9,480	3,114
Unallocated Amount to Segment
Segment Reporting Information [Line Items]
Unallocated costs	$ (1,519)	$ (1,159)	$ (4,258)	$ (3,038)

Segment Reporting - Assets for

Segment Reporting - Assets for Each Reportable Segment (Detail) - USD ($) $ in Thousands	Sep. 26, 2020	Dec. 28, 2019
Segment Reporting, Asset Reconciling Item [Line Items]
Consolidated total assets	$ 124,369	$ 126,322
Cash and investments	48,661	42,024
Restricted cash	787	787
Deferred income taxes	5,736	6,252
Other current assets	1,145	752
Common property, plant and equipment	1,461	1,307
Common operating lease right-of-use assets	1,711	1,898
Other assets	0	78
Operating Segments
Segment Reporting, Asset Reconciling Item [Line Items]
Consolidated total assets	64,868	73,224
Operating Segments | TFE
Segment Reporting, Asset Reconciling Item [Line Items]
Consolidated total assets	45,819	51,153
Operating Segments | Photonics
Segment Reporting, Asset Reconciling Item [Line Items]
Consolidated total assets	$ 19,049	$ 22,071

Income Taxes - Additional Infor

Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	Jul. 31, 2020	Sep. 26, 2020	Sep. 28, 2019	Sep. 26, 2020	Sep. 28, 2019	Dec. 29, 2020	Dec. 31, 2020
Government Grants [Line Items]
Provision for income taxes		$ 217	$ 173	$ 1,125	$ 1,144
Income tax provision on earnings of subsidiaries		111	48	659	611
Deferred payroll tax liability		547		547			$ 763
Proceeds from Income Tax Refunds	$ 157
Proceeds From Government Grants		124		434
Grant [Member] | Cost of Sales [Member]
Government Grants [Line Items]
Proceeds From Government Grants		72		252
Grant [Member] | Research and Development Expense [Member]
Government Grants [Line Items]
Proceeds From Government Grants		20		68
Grant [Member] | Selling, General and Administrative Expenses [Member]
Government Grants [Line Items]
Proceeds From Government Grants		32		114
Forecast [Member]
Government Grants [Line Items]
Proceeds From Government Grants						$ 554
Inland Revenue, Singapore (IRAS)
Government Grants [Line Items]
Deposit for contested taxes and related interest		915		915
Foreign Tax Authority | Singapore
Government Grants [Line Items]
Income tax charge (benefit)		$ 98	$ 130	$ 471	$ 534

Restructuring Charges - Additio

Restructuring Charges - Additional Information (Detail) $ in Thousands	3 Months Ended
	Sep. 26, 2020USD ($)
Restructuring and Related Activities [Abstract]
Percentage of reduction of global workforce	1.00%
Reduction in salary, wages and other employee-related expenses due to implementation of plan	$ 864

Restructuring Charges - Changes

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