Intevac (IVAC) 10-Q 28 Jul 20 2020 Q2 Quarterly report Financial data

Cover Page

Cover Page - shares	6 Months Ended
	Jun. 27, 2020	Jul. 28, 2020
Cover [Abstract]
Document Type	10-Q
Amendment Flag	false
Entity Interactive Data Current	Yes
Document Period End Date	Jun. 27, 2020
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q2
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		23,635,197
Security Exchange Name	NASDAQ

CONDENSED CONSOLIDATED BALANCE

CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 27, 2020	Dec. 28, 2019
Current assets:
Cash and cash equivalents	$ 23,944	$ 19,767
Short-term investments	14,435	16,720
Trade and other accounts receivable, net of allowances of $0 at both June 27, 2020 and at December 28, 2019	28,957	28,619
Inventories	22,210	24,907
Prepaid expenses and other current assets	1,853	1,504
Total current assets	91,399	91,517
Long-term investments	5,604	5,537
Restricted cash	787	787
Property, plant and equipment, net	11,897	11,598
Operating lease right-of-use assets	9,302	10,279
Intangible assets, net of accumulated amortization of $8,373 at June 27, 2020 and $8,113 at December 28, 2019	14	274
Deferred income taxes and other long-term assets	5,826	6,330
Total assets	124,829	126,322
Current liabilities:
Current operating lease liabilities	2,709	2,524
Accounts payable	5,135	4,199
Accrued payroll and related liabilities	6,316	6,488
Other accrued liabilities	3,916	3,593
Customer advances	433	4,007
Total current liabilities	18,509	20,811
Noncurrent liabilities:
Noncurrent operating lease liabilities	8,228	9,532
Other long-term liabilities	437	186
Total noncurrent liabilities	8,665	9,718
Stockholders' equity:
Common stock, $0.001 par value	24	23
Additional paid-in capital	190,266	188,290
Treasury stock, 5,087 shares at June 27, 2020 and 4,989 shares at December 28, 2019	(29,551)	(29,158)
Accumulated other comprehensive income	402	424
Accumulated deficit	(63,486)	(63,786)
Total stockholders' equity	97,655	95,793
Total liabilities and stockholders' equity	$ 124,829	$ 126,322

CONDENSED CONSOLIDATED BALANC_2

CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Jun. 27, 2020	Dec. 28, 2019
Statement of Financial Position [Abstract]
Net of allowances of trade, note and other accounts receivable	$ 0	$ 0
Net of amortization of intangible assets	$ 8,373	$ 8,113
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		6 Months Ended
	Jun. 27, 2020	Jun. 29, 2019	Jun. 27, 2020	Jun. 29, 2019
Net revenues:
Total net revenues	$ 28,842	$ 22,314	$ 47,682	$ 47,141
Cost of net revenues:
Total cost of net revenues	17,422	13,957	28,105	31,544
Gross profit	11,420	8,357	19,577	15,597
Operating expenses:
Research and development	3,707	3,431	6,991	7,417
Selling, general and administrative	5,609	5,854	11,581	11,105
Total operating expenses	9,316	9,285	18,572	18,522
Income (loss) from operations	2,104	(928)	1,005	(2,925)
Interest income and other income (expense), net	62	163	204	322
Income (loss) before provision for income taxes	2,166	(765)	1,209	(2,603)
Provision for income taxes	642	417	909	971
Net income (loss)	$ 1,524	$ (1,182)	$ 300	$ (3,574)
Net income (loss) per share:
Basic	$ 0.06	$ (0.05)	$ 0.01	$ (0.16)
Diluted	$ 0.06	$ (0.05)	$ 0.01	$ (0.16)
Weighted average common shares outstanding:
Basic	23,561	22,991	23,522	22,923
Diluted	23,906	22,991	23,953	22,923
Systems and components
Net revenues:
Total net revenues	$ 22,725	$ 17,237	$ 36,561	$ 38,874
Cost of net revenues:
Total cost of net revenues	13,812	10,462	21,579	25,560
Technology development
Net revenues:
Total net revenues	6,117	5,077	11,121	8,267
Cost of net revenues:
Total cost of net revenues	$ 3,610	$ 3,495	$ 6,526	$ 5,984

CONDENSED CONSOLIDATED STATEM_2

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 27, 2020	Jun. 29, 2019	Jun. 27, 2020	Jun. 29, 2019
Statement Of Income And Comprehensive Income [Abstract]
Net income (loss)	$ 1,524	$ (1,182)	$ 300	$ (3,574)
Other comprehensive income (loss), before tax:
Change in unrealized net gain on available-for-sale investments	51	32	53	77
Foreign currency translation gains (losses)	20	(61)	(75)	0
Other comprehensive income (loss), before tax	71	(29)	(22)	77
Income taxes related to items in other comprehensive income (loss)	0	0	0	0
Other comprehensive income (loss), net of tax	71	(29)	(22)	77
Comprehensive income (loss)	$ 1,595	$ (1,211)	$ 278	$ (3,497)

CONDENSED CONSOLIDATED STATEM_3

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 27, 2020	Jun. 29, 2019
Operating activities
Net income (loss)	$ 300	$ (3,574)
Adjustments to reconcile the net income (loss) to net cash and cash equivalents provided by operating activities:
Depreciation & amortization	1,797	1,920
Net amortization (accretion) of investment premiums and discounts	(26)	(34)
Equity-based compensation	1,328	1,509
Straight-line rent adjustment and amortization of lease incentives	(142)	(158)
Change in the fair value of acquisition-related contingent consideration	0	7
Deferred income taxes	426	517
Loss on disposal of fixed assets	0	45
Changes in operating assets and liabilities	(148)	776
Total adjustments	3,235	4,582
Net cash and cash equivalents provided by operating activities	3,535	1,008
Investing activities
Purchase of investments	(12,213)	(10,150)
Proceeds from sales and maturities of investments	14,510	14,961
Purchase of leasehold improvements and equipment	(1,837)	(1,398)
Net cash and cash equivalents provided by investing activities	460	3,413
Financing activities
Net proceeds from issuance of common stock	994	1,021
Common stock repurchases	(393)	(42)
Taxes paid related to net share settlement	(345)	(268)
Payment of acquisition-related contingent consideration	0	(230)
Net cash and cash equivalents provided by financing activities	256	481
Effect of exchange rate changes on cash and cash equivalents	(74)	0
Net increase in cash, cash equivalents and restricted cash	4,177	4,902
Cash, cash equivalents and restricted cash at beginning of period	20,554	19,884
Cash, cash equivalents and restricted cash at end of period	24,731	24,786
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	6 Months Ended
	Jun. 27, 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 six months ended June 27, 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 June 27, 2020, the Company received $310,000 in JSS grants, of which $180,000 is reported as a reduction of cost of net revenues, $49,000 is reported as a reduction of research and development (“R&D”) expenses and $81,000 is reported as a reduction of selling, general and administrative expenses on the condensed consolidated statements of operations.

Revenue

Revenue	6 Months Ended
	Jun. 27, 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 six months ended June 27, 2020 and June 29, 2019 along with the reportable segment for each category. Major Products and Service Lines TFE Three Months Ended June 27, 2020 Three Months Ended June 29, 2019 (In thousands) HDD DCP PV Total HDD DCP PV Total Systems, upgrades $ 15,226 $ — $ 61 $ 15,287 $ 12,423 $ — $ 18 $ 12,441 Field service 1,306 — 2 1,308 821 2 — 823 Total TFE net revenues $ 16,532 $ — $ 63 $ 16,595 $ 13,244 $ 2 $ 18 $ 13,264 Six Months Ended June 27, 2020 Six Months Ended June 29, 2019 (In thousands) HDD DCP PV Total HDD DCP PV Total Systems, upgrades and spare parts $ 21,587 $ — $ 269 $ 21,856 $ 23,473 $ — $ 6,391 $ 29,864 Field service 2,699 — 2 2,701 2,343 2 — 2,345 Total TFE net revenues $ 24,286 $ — $ 271 $ 24,557 $ 25,816 $ 2 $ 6,391 $ 32,209 Three Months Ended Six Months Ended Photonics June 27, 2020 June 29, 2019 June 27, 2020 June 29, 2019 (In thousands) Products: Military products $ 5,446 $ 2,981 $ 10,811 $ 4,794 Commercial products 39 182 118 500 Repair and other services 645 810 1,075 1,371 Total Photonics product net revenues 6,130 3,973 12,004 6,665 Technology development: Firm Fixed Price (“FFP”) 5,462 3,085 9,892 4,777 Cost Plus Fixed Fee (“CPFF”) 655 1,992 1,229 3,488 Time and materials — — — 2 Total technology development net revenues 6,117 5,077 11,121 8,267 Total Photonics net revenues $ 12,247 $ 9,050 $ 23,125 $ 14,932 Primary Geographical Markets Three Months Ended Three Months Ended June 27, 2020 June 29, 2019 (In thousands) TFE Photonics Total TFE Photonics Total United States $ 313 $ 12,125 $ 12,438 $ 356 $ 8,811 $ 9,167 Asia 16,282 — 16,282 12,908 — 12,908 Europe — 122 122 — 239 239 Total net revenues $ 16,595 $ 12,247 $ 28,842 $ 13,264 $ 9,050 $ 22,314 Six Months Ended Six Months Ended June 27, 2020 June 29, 2019 (In thousands) TFE Photonics Total TFE Photonics Total United States $ 832 $ 22,981 $ 23,813 $ 517 $ 14,527 $ 15,044 Asia 23,725 — 23,725 31,692 — 31,692 Europe — 144 144 — 405 405 Total net revenues $ 24,557 $ 23,125 $ 47,682 $ 32,209 $ 14,932 $ 47,141 Timing of Revenue Recognition Three Months Ended Three Months Ended June 27, 2020 June 29, 2019 (In thousands) TFE Photonics Total TFE Photonics Total Products transferred at a point in time $ 16,595 $ 645 $ 17,240 $ 13,264 $ 810 $ 14,074 Products and services transferred over time — 11,602 11,602 — 8,240 8,240 $ 16,595 $ 12,247 $ 28,842 $ 13,264 $ 9,050 $ 22,314 Six Months Ended Six Months Ended June 27, 2020 June 29, 2019 (In thousands) TFE Photonics Total TFE Photonics Total Products transferred at a point in time $ 24,557 $ 1,075 $ 25,632 $ 32,209 $ 1,371 $ 33,580 Products and services transferred over time — 22,050 22,050 — 13,561 13,561 $ 24,557 $ 23,125 $ 47,682 $ 32,209 $ 14,932 $ 47,141 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 six months ended June 27, 2020: June 27, December 28, Six Months Change (In thousands) TFE: Contract assets: Accounts receivable, unbilled $ 560 $ 760 $ (200 ) Contract liabilities: Deferred revenue $ 464 $ 320 $ 144 Customer advances 433 4,007 (3,574 ) $ 897 $ 4,327 $ (3,430 ) Photonics: Contract assets: Accounts receivable, unbilled $ 574 $ 3,210 $ (2,636 ) Retainage 121 99 22 $ 695 $ 3,309 $ (2,614 ) Contract liabilities: Deferred revenue $ 1,259 $ — $ 1,259 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 six months ended June 27, 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 six months ended June 27, 2020, we recognized revenue in our TFE segment of $4.0 million and $55,000 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 six months ended June 27, 2020, contract assets in our Photonics segment decreased by $2.6 million primarily due to the billing of contractual milestones, offset in part by the accrual of revenue for incurred costs under FFP and CPFF contracts. Deferred revenue in our Photonics segment generally represents a contract liability for amounts billed to the customer upon achievement of contractual milestones. These amounts are liquidated when revenue is recognized. On June 27, 2020, we had $69.0 million of remaining performance obligations, which we also refer to as backlog. Backlog at June 27, 2020 consisted of $14.6 million of TFE backlog and $54.4 million of Photonics backlog. We expect to recognize approximately 49% of our remaining performance obligations as revenue in 2020, 26% in 2021, 17% in 2022 and 8% in 2023.

Inventories

Inventories	6 Months Ended
	Jun. 27, 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: June 27, 2020 December 28, 2019 (In thousands) Raw materials $ 11,280 $ 15,286 Work-in-progress 4,363 4,748 Finished goods 6,567 4,873 $ 22,210 $ 24,907 Net inventories at June 27, 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 June 27, 2020 also included one VERTEX SPECTRA system for DCP at Intevac’s factory pending delivery to a customer for evaluation.

Equity-Based Compensation

Equity-Based Compensation	6 Months Ended
	Jun. 27, 2020
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Equity-Based Compensation	4. Equity-Based Compensation At June 27, 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 Compensation Expense The effect of recording equity-based compensation for the three and six months ended June 27, 2020 and June 29, 2019 was as follows: Three Months Ended Six Months Ended June 27, June 29, June 27, June 29, (In thousands) Equity-based compensation by type of award: Stock options $ 149 $ 191 $ 364 $ 398 RSUs 450 352 816 642 Employee stock purchase plan 57 210 148 469 Total equity-based compensation $ 656 $ 753 $ 1,328 $ 1,509 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 June 27, 2020 and changes during the six months ended June 27, 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 (13,742 ) $ 5.80 Options exercised (51,097 ) $ 4.69 Options outstanding at June 27, 2020 2,037,771 $ 6.68 Options exercisable at June 27, 2020 1,541,989 $ 6.78 Intevac issued 189,833 shares of common stock under the ESPP during the six months ended June 27, 2020. Intevac estimated the weighted-average fair value of stock options and ESPP purchase rights using the following weighted-average assumptions: Three Months Ended Six Months Ended June 27, 2020 June 29, 2019 June 27, 2020 June 29, 2019 Stock Options: Weighted-average fair value of grants per share — $ 2.05 $ 1.82 $ 2.06 Expected volatility — 43.19 % 46.06 % 43.20 % Risk-free interest rate — 1.86 % 0.44 % 1.88 % Expected term of options (in years) — 4.6 4.39 4.6 Dividend yield None None None None Six Months Ended June 27, 2020 June 29, 2019 ESPP Purchase Rights: Weighted-average fair value of grants per share $ 1.66 $ 1.89 Expected volatility 36.69 % 50.00 % Risk-free interest rate 1.56 % 2.53 % Expected term of purchase rights (in years) 0.5 1.0 Dividend yield 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: Three Months Ended June 29, 2019 Weighted-average fair value of grants per share $ 1.75 Expected volatility 43.43 % Risk-free interest rate 1.96 % Expected term (in years) 4.6 Dividend yield None RSUs RSU activity as of June 27, 2020 and changes during the six months ended June 27, 2020 were as follows: Shares Weighted Average Grant Date Fair Value Non-vested 553,355 $ 6.15 Granted 584,289 $ 4.72 Vested (212,848 ) $ 6.54 Cancelled and forfeited (6,304 ) $ 6.13 Non-vested 918,492 $ 5.15 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: Three Months Ended June 27, 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	6 Months Ended
	Jun. 27, 2020
Goodwill and Intangible Assets Disclosure [Abstract]
Purchased Intangible Assets	5. Purchased Intangible Assets Details of finite-lived intangible assets by segment as of June 27, 2020, are as follows: June 27, 2020 Gross Carrying Accumulated Net Carrying (In thousands) TFE $ 7,172 $ (7,172 ) $ — Photonics 1,215 (1,201 ) 14 $ 8,387 $ (8,373 ) $ 14 Total amortization expense of finite-lived intangibles for the three and six months ended June 27, 2020 was $106,000 and $260,000, respectively. As of June 27, 2020, future amortization expense is expected to be as follows: (In thousands) 2020 $ 14

Acquisition-Related Contingent

Acquisition-Related Contingent Consideration	6 Months Ended
	Jun. 27, 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 June 27, 2020. The following table represents a reconciliation of the change in the fair value measurement of the contingent consideration liability for the three and six months ended June 29, 2019: Three Months End Six Months End June 29, 2019 June 29, 2019 (In thousands) Opening balance $ 132 $ 223 Changes in fair value — 7 Cash payments made (132 ) (230 ) Closing balance $ — $ —

Warranty

Warranty	6 Months Ended
	Jun. 27, 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 six months ended June 27, 2020 and June 29, 2019: Three Months Ended Six Months Ended June 27, 2020 June 29, 2019 June 27, 2020 June 29, 2019 (In thousands) Opening balance $ 725 $ 1,297 $ 1,022 $ 997 Expenditures incurred under warranties (189 ) (257 ) (308 ) (424 ) Accruals for product warranties issued during the reporting period 135 78 159 402 Adjustments to previously existing warranty accruals (9 ) (170 ) (211 ) (27 ) Closing balance $ 662 $ 948 $ 662 $ 948 The following table displays the balance sheet classification of the warranty provision account at June 27, 2020 and at December 28, 2019. June 27, December 28, 2020 2019 (In thousands) Other accrued liabilities $ 487 $ 846 Other long-term liabilities 175 176 Total warranty provision $ 662 $ 1,022

Guarantees

Guarantees	6 Months Ended
	Jun. 27, 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 June 27, 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	6 Months Ended
	Jun. 27, 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: June 27, 2020 Amortized Cost Unrealized Unrealized Fair Value (In thousands) Cash and cash equivalents: Cash $ 19,185 $ — $ — $ 19,185 Money market funds 4,759 — — 4,759 Total cash and cash equivalents $ 23,944 $ — $ — $ 23,944 Short-term investments: Certificates of deposit $ 5,200 $ 10 $ 1 $ 5,209 Commercial paper 1,897 2 — 1,899 Corporate bonds and medium-term notes 3,846 33 1 3,878 U.S. treasury and agency securities 3,448 1 — 3,449 Total short-term investments $ 14,391 $ 46 $ 2 $ 14,435 Long-term investments: Certificates of deposit $ 1,000 $ — $ — $ 1,000 Corporate bonds and medium-term notes 2,056 9 — 2,065 U.S. treasury and agency securities 2,496 43 — 2,539 Total long-term investments $ 5,552 $ 52 $ — $ 5,604 Total cash, cash equivalents, and investments $ 43,887 $ 98 $ 2 $ 43,983 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 Amortized Cost Fair Value (In thousands) Due in one year or less $ 19,150 $ 19,194 Due after one through five years 5,552 5,604 $ 24,702 $ 24,798 The following table provides the fair market value of Intevac’s investments with unrealized losses that are not deemed to be other-than temporarily impaired as of June 27, 2020. June 27, 2020 In Loss Position for Less than 12 Months In Loss Position for Greater than 12 Months Fair Value Gross Unrealized Losses Fair Value Gross Unrealized Losses (In thousands) Certificates of deposit $ 2,199 $ 1 $ — $ — Corporate bonds and medium-term notes 1,027 1 — — $ 3,226 $ 2 $ — $ — All prices for the fixed maturity securities including U.S. treasury and agency securities, certificates of deposit, commercial paper, corporate bonds, asset backed securities 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 to sell a security in an orderly transaction. Any pricing where the input is based solely on a broker price is deemed to be a Level 3 price. Intevac uses the pricing data obtained from its outside investment manager as the primary input to make its assessments and determinations as to the ultimate valuation of the above-mentioned securities and has not made, during the periods presented, any material adjustments to such inputs. The following table represents the fair value hierarchy of Intevac’s available-for-sale Fair Value Measurements at June 27, 2020 Total Level 1 Level 2 (In thousands) Recurring fair value measurements: Available-for-sale Money market funds $ 4,759 $ 4,759 $ — U.S. treasury and agency securities 5,988 5,988 — Certificates of deposit 6,209 — 6,209 Commercial paper 1,899 — 1,899 Corporate bonds and medium-term notes 5,943 — 5,943 Total recurring fair value measurements $ 24,798 $ 10,747 $ 14,051

Derivative Instruments

Derivative Instruments	6 Months Ended
	Jun. 27, 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 June 27, 2020 and December 28, 2019. Notional Amounts Derivative Liabilities Derivative Instrument June 27, December 28, June 27, 2020 December 28, Balance Sheet Line Fair Value Balance Sheet Line Fair Value (In thousands) Undesignated Hedges: Forward Foreign Currency Contracts $ 574 $ 1,035 * $ 2 * $ 4 Total Hedges $ 574 $ 1,035 $ 2 $ 4 * Other accrued liabilities

Equity

Equity	6 Months Ended
	Jun. 27, 2020
Equity [Abstract]
Equity	11. Equity 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 June 27, 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 Six Months Ended June 27, 2020 June 29, 2019 June 27, 2020 June 29, 2019 (In thousands, except per share amounts) Shares of common stock repurchased — 9 98 9 Cost of stock repurchased $ — $ 42 $ 393 $ 42 Average price paid per share $ — $ 4.69 $ 3.97 $ 4.69 Intevac records treasury stock purchases under the cost method using the first-in, first-out paid-in paid-in Condensed Consolidated Statement of Changes in Equity The changes in stockholders’ equity by component for the three and six months ended June 27, 2020 and June 29, 2019, are as follows (in thousands): Three months ended June 27, 2020 Common Stock and Additional Paid-in Capital Treasury Stock Accumulated Other Comprehensive Income Accumulated Deficit Total Stockholders’ Equity Balance at March 28, 2020 $ 189,899 $ (29,551 ) $ 331 $ (65,010 ) $ 95,669 Common stock issued under employee plans 44 — — — 44 Shares withheld for net share settlement of RSUs (309 ) — — — (309 ) Equity-based compensation expense 656 — — — 656 Net income — — — 1,524 1,524 Other comprehensive income — — 71 — 71 Balance at June 27, 2020 $ 190,290 $ (29,551 ) $ 402 $ (63,486 ) $ 97,655 Six months ended June 27, 2020 Common Stock and Additional Paid-in Capital Treasury Stock Accumulated Other Comprehensive Income Accumulated Deficit Total Stockholders’ Equity Balance at December 28, 2019 $ 188,313 $ (29,158 ) $ 424 $ (63,786 ) $ 95,793 Common stock issued under employee plans 994 — — — 994 Shares withheld for net share settlement of RSUs (345 ) — — — (345 ) Equity-based compensation expense 1,328 — — — 1,328 Net income — — — 300 300 Other comprehensive loss — — (22 ) — (22 ) Common stock repurchases — (393 ) — — (393 ) Balance at June 27, 2020 $ 190,290 $ (29,551 ) $ 402 $ (63,486 ) $ 97,655 Three months ended June 29, 2019 Common Stock and Additional Paid-in Capital Treasury Stock Accumulated Other Comprehensive Income Accumulated Deficit Total Stockholders’ Equity Balance at March 30, 2019 $ 184,976 $ (29,047 ) $ 484 $ (67,326 ) $ 89,087 Shares withheld for net share settlement of RSUs (240 ) — — — (240 ) Equity-based compensation expense 753 — — — 753 Net loss — — — (1,182 ) (1,182 ) Other comprehensive loss — — (29 ) — (29 ) Common stock repurchases — (42 ) — — (42 ) Balance at June 29, 2019 $ 185,489 $ (29,089 ) $ 455 $ (68,508 ) $ 88,347 Six months ended June 29, 2019 Common Stock and Additional Paid-in Capital Treasury Stock Accumulated Other Comprehensive Income Accumulated Deficit Total Stockholders’ Equity Balance at December 29, 2018 $ 183,227 $ (29,047 ) $ 378 $ (64,934 ) $ 89,624 Common stock issued under employee plans 1,021 — — — 1,021 Shares withheld for net share settlement of RSUs (268 ) — — — (268 ) Equity-based compensation expense 1,509 — — — 1,509 Net loss — — — (3,574 ) (3,574 ) Other comprehensive income — — 77 — 77 Common stock repurchases — (42 ) — — (42 ) Balance at June 29, 2019 $ 185,489 $ (29,089 ) $ 455 $ (68,508 ) $ 88,347 Accumulated Other Comprehensive Income The changes in accumulated other comprehensive income by component for the three and six months ended June 27, 2020 and June 29, 2019, are as follows. Three Months Ended Six Months Ended June 27, 2020 Foreign Unrealized gain s available-for-sale Total Foreign Unrealized gains available-for-sale Total (In thousands) Beginning balance $ 286 $ 45 $ 331 $ 381 $ 43 $ 424 Other comprehensive income (loss) before reclassification 20 51 71 (75 ) 53 (22 ) Amounts reclassified from other comprehensive income — — — — — — Net current-period other comprehensive income (loss) 20 51 71 (75 ) 53 (22 ) Ending balance $ 306 $ 96 $ 402 $ 306 $ 96 $ 402 Three Months Ended Six Months Ended June 29, 2019 Foreign Unrealized available-for-sale Total Foreign Unrealized available-for-sale Total (In thousands) Beginning balance $ 466 $ 18 $ 484 $ 405 $ (27 ) $ 378 Other comprehensive income (loss) before reclassification (61 ) 32 (29 ) — 77 77 Amounts reclassified from other comprehensive income — — — — — — Net current-period other comprehensive income (loss) (61 ) 32 (29 ) — 77 77 Ending balance $ 405 $ 50 $ 455 $ 405 $ 50 $ 455

Net Loss Per Share

Net Loss Per Share	6 Months Ended
	Jun. 27, 2020
Earnings Per Share [Abstract]
Net Loss Per Share	12. Net Income (Loss) Per Share The following table sets forth the computation of basic and diluted net income (loss) per share: Three Months Ended Six Months Ended June 27, 2020 June 29, 2019 June 27, 2020 June 29, 2019 (In thousands, except per share amounts) Net income (loss) $ 1,524 $ (1,182 ) $ 300 $ (3,574 ) Weighted-average shares – basic 23,561 22,991 23,522 22,923 Effect of dilutive potential common shares 345 — 431 — Weighted-average shares – diluted 23,906 22,991 23,953 22,923 Net income (loss) per share – basic $ 0.06 $ (0.05 ) $ 0.01 $ (0.16 ) Net income (loss) per share –diluted $ 0.06 $ (0.05 ) $ 0.01 $ (0.16 ) The following potentially dilutive securities were excluded (as common stock equivalents) from the computation of diluted net income (loss) per share for the periods presented as their effect would have been antidilutive: Three Months Ended Six Months Ended June 27, 2020 June 29, 2019 June 27, 2020 June 29, 2019 (In thousands) Stock options to purchase common stock 1,596 2,211 1,596 2,211 RSUs 19 583 19 583 Employee stock purchase plan 2 64 2 64

Segment Reporting

Segment Reporting	6 Months Ended
	Jun. 27, 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 June 27, 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 six months ended June 27, 2020 and June 29, 2019 is as follows: Net Revenues Three Months Ended Six Months Ended June 27, 2020 June 29, 2019 June 27, 2020 June 29, 2019 (In thousands) TFE $ 16,595 $ 13,264 $ 24,557 $ 32,209 Photonics 12,247 9,050 23,125 14,932 Total segment net revenues $ 28,842 $ 22,314 $ 47,682 $ 47,141 Operating Income (Loss) Three Months Ended Six Months Ended June 27, 2020 June 29, 2019 June 27, 2020 June 29, 2019 (In thousands) TFE $ (174 ) $ (1,291 ) $ (2,705 ) $ (1,892 ) Photonics 3,536 1,487 6,448 846 Total income (loss) from segment operations 3,362 196 3,743 (1,046 ) Unallocated costs (1,258 ) (1,124 ) (2,738 ) (1,879 ) Income (loss) from operations 2,104 (928 ) 1,005 (2,925 ) Interest income and other income (expense), net 62 163 204 322 Income (loss) before provision for income taxes $ 2,166 $ (765 ) $ 1,209 $ (2,603 ) Total assets for each reportable segment as of June 27, 2020 and December 28, 2019 are as follows: Assets June 27, December 28, (In thousands) TFE $ 43,175 $ 51,153 Photonics 26,622 22,071 Total segment assets 69,797 73,244 Cash, cash equivalents and investments 43,983 42,024 Restricted cash 787 787 Deferred income taxes 5,826 6,252 Other current assets 1,207 752 Common property, plant and equipment 1,414 1,307 Common operating lease right-of-use 1,815 1,898 Other assets — 78 Consolidated total assets $ 124,829 $ 126,322

Income Taxes

Income Taxes	6 Months Ended
	Jun. 27, 2020
Income Tax Disclosure [Abstract]
Income Taxes	14. Income Taxes Intevac recorded income tax provisions of $642,000 and $909,000 for the three and six months ended June 27, 2020, respectively, and $417,000 and $971,000 for the three and six months ended June 29, 2019, respectively. The income tax provisions for these three and six month periods are based upon estimates of annual income (loss), annual permanent differences and statutory tax rates in the various jurisdictions in which Intevac operates. For the three and six month periods ended June 27, 2020 Intevac recorded income tax provisions on earnings of its international subsidiaries of $369,000 and $548,000, respectively, and recorded $272,000 and $373,000, respectively, for withholding taxes on royalties paid into the United States from Intevac’s Singapore subsidiary as discrete items. For the three and six month periods ended June 29, 2019, Intevac recorded income tax provisions on earnings of its international subsidiaries of $201,000 and $563,000, respectively, and recorded $213,000 and $404,000, respectively, for withholding taxes on royalties paid into the United States from Intevac’s Singapore subsidiary as discrete items. For all periods presented Intevac utilized net operating loss carry-forwards to offset the impact of global intangible low-taxed The Coronavirus Aid, Relief, and Economic Security Act (“CARES Act”) was enacted on March 27, 2020 in the United States. The CARES Act includes several significant provisions for corporations, including the usage of net operating losses and payroll benefits. Several foreign (non-U.S.) non-U.S. Under the CARES Act, we 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 was received in July 2020 and is included in trade and other accounts receivable at June 27, 2020 on the condensed consolidated balance sheets. 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 $535,000 in JSS grants in fiscal 2020. During the quarter ended June 27, 2020, the Company received $310,000 in JSS grants, of which $180,000 is reported as a reduction of cost of net revenues, $49,000 is reported as a reduction of R&D expenses and $81,000 is reported as a reduction of selling, general and administrative expenses on the condensed consolidated statement of operations.

Contingencies

Contingencies	6 Months Ended
	Jun. 27, 2020
Commitments and Contingencies Disclosure [Abstract]
Contingencies	15. 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)	6 Months Ended
	Jun. 27, 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 June 27, 2020, the Company received $310,000 in JSS grants, of which $180,000 is reported as a reduction of cost of net revenues, $49,000 is reported as a reduction of research and development (“R&D”) expenses and $81,000 is reported as a reduction of selling, general and administrative expenses on the condensed consolidated statements of operations.

Revenue (Tables)

Revenue (Tables)	6 Months Ended
	Jun. 27, 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 six months ended June 27, 2020 and June 29, 2019 along with the reportable segment for each category. Major Products and Service Lines TFE Three Months Ended June 27, 2020 Three Months Ended June 29, 2019 (In thousands) HDD DCP PV Total HDD DCP PV Total Systems, upgrades $ 15,226 $ — $ 61 $ 15,287 $ 12,423 $ — $ 18 $ 12,441 Field service 1,306 — 2 1,308 821 2 — 823 Total TFE net revenues $ 16,532 $ — $ 63 $ 16,595 $ 13,244 $ 2 $ 18 $ 13,264 Six Months Ended June 27, 2020 Six Months Ended June 29, 2019 (In thousands) HDD DCP PV Total HDD DCP PV Total Systems, upgrades and spare parts $ 21,587 $ — $ 269 $ 21,856 $ 23,473 $ — $ 6,391 $ 29,864 Field service 2,699 — 2 2,701 2,343 2 — 2,345 Total TFE net revenues $ 24,286 $ — $ 271 $ 24,557 $ 25,816 $ 2 $ 6,391 $ 32,209 Three Months Ended Six Months Ended Photonics June 27, 2020 June 29, 2019 June 27, 2020 June 29, 2019 (In thousands) Products: Military products $ 5,446 $ 2,981 $ 10,811 $ 4,794 Commercial products 39 182 118 500 Repair and other services 645 810 1,075 1,371 Total Photonics product net revenues 6,130 3,973 12,004 6,665 Technology development: Firm Fixed Price (“FFP”) 5,462 3,085 9,892 4,777 Cost Plus Fixed Fee (“CPFF”) 655 1,992 1,229 3,488 Time and materials — — — 2 Total technology development net revenues 6,117 5,077 11,121 8,267 Total Photonics net revenues $ 12,247 $ 9,050 $ 23,125 $ 14,932 Primary Geographical Markets Three Months Ended Three Months Ended June 27, 2020 June 29, 2019 (In thousands) TFE Photonics Total TFE Photonics Total United States $ 313 $ 12,125 $ 12,438 $ 356 $ 8,811 $ 9,167 Asia 16,282 — 16,282 12,908 — 12,908 Europe — 122 122 — 239 239 Total net revenues $ 16,595 $ 12,247 $ 28,842 $ 13,264 $ 9,050 $ 22,314 Six Months Ended Six Months Ended June 27, 2020 June 29, 2019 (In thousands) TFE Photonics Total TFE Photonics Total United States $ 832 $ 22,981 $ 23,813 $ 517 $ 14,527 $ 15,044 Asia 23,725 — 23,725 31,692 — 31,692 Europe — 144 144 — 405 405 Total net revenues $ 24,557 $ 23,125 $ 47,682 $ 32,209 $ 14,932 $ 47,141 Timing of Revenue Recognition Three Months Ended Three Months Ended June 27, 2020 June 29, 2019 (In thousands) TFE Photonics Total TFE Photonics Total Products transferred at a point in time $ 16,595 $ 645 $ 17,240 $ 13,264 $ 810 $ 14,074 Products and services transferred over time — 11,602 11,602 — 8,240 8,240 $ 16,595 $ 12,247 $ 28,842 $ 13,264 $ 9,050 $ 22,314 Six Months Ended Six Months Ended June 27, 2020 June 29, 2019 (In thousands) TFE Photonics Total TFE Photonics Total Products transferred at a point in time $ 24,557 $ 1,075 $ 25,632 $ 32,209 $ 1,371 $ 33,580 Products and services transferred over time — 22,050 22,050 — 13,561 13,561 $ 24,557 $ 23,125 $ 47,682 $ 32,209 $ 14,932 $ 47,141
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 six months ended June 27, 2020: June 27, December 28, Six Months Change (In thousands) TFE: Contract assets: Accounts receivable, unbilled $ 560 $ 760 $ (200 ) Contract liabilities: Deferred revenue $ 464 $ 320 $ 144 Customer advances 433 4,007 (3,574 ) $ 897 $ 4,327 $ (3,430 ) Photonics: Contract assets: Accounts receivable, unbilled $ 574 $ 3,210 $ (2,636 ) Retainage 121 99 22 $ 695 $ 3,309 $ (2,614 ) Contract liabilities: Deferred revenue $ 1,259 $ — $ 1,259

Inventories (Tables)

Inventories (Tables)	6 Months Ended
	Jun. 27, 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: June 27, 2020 December 28, 2019 (In thousands) Raw materials $ 11,280 $ 15,286 Work-in-progress 4,363 4,748 Finished goods 6,567 4,873 $ 22,210 $ 24,907

Equity-Based Compensation (Tabl

Equity-Based Compensation (Tables)	6 Months Ended
	Jun. 27, 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 six months ended June 27, 2020 and June 29, 2019 was as follows: Three Months Ended Six Months Ended June 27, June 29, June 27, June 29, (In thousands) Equity-based compensation by type of award: Stock options $ 149 $ 191 $ 364 $ 398 RSUs 450 352 816 642 Employee stock purchase plan 57 210 148 469 Total equity-based compensation $ 656 $ 753 $ 1,328 $ 1,509
Summary of Stock Option Activity	Option activity as of June 27, 2020 and changes during the six months ended June 27, 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 (13,742 ) $ 5.80 Options exercised (51,097 ) $ 4.69 Options outstanding at June 27, 2020 2,037,771 $ 6.68 Options exercisable at June 27, 2020 1,541,989 $ 6.78
Employee Stock Options Weighted-Average Assumptions	Intevac estimated the weighted-average fair value of stock options and ESPP purchase rights using the following weighted-average assumptions: Three Months Ended Six Months Ended June 27, 2020 June 29, 2019 June 27, 2020 June 29, 2019 Stock Options: Weighted-average fair value of grants per share — $ 2.05 $ 1.82 $ 2.06 Expected volatility — 43.19 % 46.06 % 43.20 % Risk-free interest rate — 1.86 % 0.44 % 1.88 % Expected term of options (in years) — 4.6 4.39 4.6 Dividend yield None None None None Six Months Ended June 27, 2020 June 29, 2019 ESPP Purchase Rights: Weighted-average fair value of grants per share $ 1.66 $ 1.89 Expected volatility 36.69 % 50.00 % Risk-free interest rate 1.56 % 2.53 % Expected term of purchase rights (in years) 0.5 1.0 Dividend yield None None
Summary of Restricted Stock Units Activity	RSU activity as of June 27, 2020 and changes during the six months ended June 27, 2020 were as follows: Shares Weighted Average Grant Date Fair Value Non-vested 553,355 $ 6.15 Granted 584,289 $ 4.72 Vested (212,848 ) $ 6.54 Cancelled and forfeited (6,304 ) $ 6.13 Non-vested 918,492 $ 5.15
Employee Stock Purchase Rights Weighted-Average Assumptions	Intevac estimated the weighted-average fair value of PRSUs using the following weighted-average assumptions: Three Months Ended June 27, 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: Three Months Ended June 29, 2019 Weighted-average fair value of grants per share $ 1.75 Expected volatility 43.43 % Risk-free interest rate 1.96 % Expected term (in years) 4.6 Dividend yield None

Purchased Intangible Assets (Ta

Purchased Intangible Assets (Tables)	6 Months Ended
	Jun. 27, 2020
Goodwill and Intangible Assets Disclosure [Abstract]
Information Regarding Other Acquisition Related Intangible Assets	Details of finite-lived intangible assets by segment as of June 27, 2020, are as follows: June 27, 2020 Gross Carrying Accumulated Net Carrying (In thousands) TFE $ 7,172 $ (7,172 ) $ — Photonics 1,215 (1,201 ) 14 $ 8,387 $ (8,373 ) $ 14
Estimated Future Amortization Expense Related to Finite-Lived Purchased Intangible Assets	As of June 27, 2020, future amortization expense is expected to be as follows: (In thousands) 2020 $ 14

Acquisition-Related Contingen_2

Acquisition-Related Contingent Consideration (Tables)	6 Months Ended
	Jun. 27, 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 three and six months ended June 29, 2019: Three Months End Six Months End June 29, 2019 June 29, 2019 (In thousands) Opening balance $ 132 $ 223 Changes in fair value — 7 Cash payments made (132 ) (230 ) Closing balance $ — $ —

Warranty (Tables)

Warranty (Tables)	6 Months Ended
	Jun. 27, 2020
Guarantees [Abstract]
Schedule of Product Warranty Liability	The following table displays the activity in the warranty provision account for the three and six months ended June 27, 2020 and June 29, 2019: Three Months Ended Six Months Ended June 27, 2020 June 29, 2019 June 27, 2020 June 29, 2019 (In thousands) Opening balance $ 725 $ 1,297 $ 1,022 $ 997 Expenditures incurred under warranties (189 ) (257 ) (308 ) (424 ) Accruals for product warranties issued during the reporting period 135 78 159 402 Adjustments to previously existing warranty accruals (9 ) (170 ) (211 ) (27 ) Closing balance $ 662 $ 948 $ 662 $ 948 The following table displays the balance sheet classification of the warranty provision account at June 27, 2020 and at December 28, 2019. June 27, December 28, 2020 2019 (In thousands) Other accrued liabilities $ 487 $ 846 Other long-term liabilities 175 176 Total warranty provision $ 662 $ 1,022

Cash, Cash Equivalents and In_2

Cash, Cash Equivalents and Investments (Tables)	6 Months Ended
	Jun. 27, 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: June 27, 2020 Amortized Cost Unrealized Unrealized Fair Value (In thousands) Cash and cash equivalents: Cash $ 19,185 $ — $ — $ 19,185 Money market funds 4,759 — — 4,759 Total cash and cash equivalents $ 23,944 $ — $ — $ 23,944 Short-term investments: Certificates of deposit $ 5,200 $ 10 $ 1 $ 5,209 Commercial paper 1,897 2 — 1,899 Corporate bonds and medium-term notes 3,846 33 1 3,878 U.S. treasury and agency securities 3,448 1 — 3,449 Total short-term investments $ 14,391 $ 46 $ 2 $ 14,435 Long-term investments: Certificates of deposit $ 1,000 $ — $ — $ 1,000 Corporate bonds and medium-term notes 2,056 9 — 2,065 U.S. treasury and agency securities 2,496 43 — 2,539 Total long-term investments $ 5,552 $ 52 $ — $ 5,604 Total cash, cash equivalents, and investments $ 43,887 $ 98 $ 2 $ 43,983 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 Amortized Cost Fair Value (In thousands) Due in one year or less $ 19,150 $ 19,194 Due after one through five years 5,552 5,604 $ 24,702 $ 24,798
Fair Market Value of Investments with Unrealized Losses Not Deemed to be Other-Than Temporarily Impaired	The following table provides the fair market value of Intevac’s investments with unrealized losses that are not deemed to be other-than temporarily impaired as of June 27, 2020. June 27, 2020 In Loss Position for Less than 12 Months In Loss Position for Greater than 12 Months Fair Value Gross Unrealized Losses Fair Value Gross Unrealized Losses (In thousands) Certificates of deposit $ 2,199 $ 1 $ — $ — Corporate bonds and medium-term notes 1,027 1 — — $ 3,226 $ 2 $ — $ —
Fair Value Hierarchy of Available-for-Sale Securities Measured at Fair Value on Recurring Basis	The following table represents the fair value hierarchy of Intevac’s available-for-sale Fair Value Measurements at June 27, 2020 Total Level 1 Level 2 (In thousands) Recurring fair value measurements: Available-for-sale Money market funds $ 4,759 $ 4,759 $ — U.S. treasury and agency securities 5,988 5,988 — Certificates of deposit 6,209 — 6,209 Commercial paper 1,899 — 1,899 Corporate bonds and medium-term notes 5,943 — 5,943 Total recurring fair value measurements $ 24,798 $ 10,747 $ 14,051

Derivative Instruments (Tables)

Derivative Instruments (Tables)	6 Months Ended
	Jun. 27, 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 June 27, 2020 and December 28, 2019. Notional Amounts Derivative Liabilities Derivative Instrument June 27, December 28, June 27, 2020 December 28, Balance Sheet Line Fair Value Balance Sheet Line Fair Value (In thousands) Undesignated Hedges: Forward Foreign Currency Contracts $ 574 $ 1,035 * $ 2 * $ 4 Total Hedges $ 574 $ 1,035 $ 2 $ 4 * Other accrued liabilities

Equity (Tables)

Equity (Tables)	6 Months Ended
	Jun. 27, 2020
Equity [Abstract]
Schedule of Stock Repurchases	The following table summarizes Intevac’s stock repurchases: Three Months Ended Six Months Ended June 27, 2020 June 29, 2019 June 27, 2020 June 29, 2019 (In thousands, except per share amounts) Shares of common stock repurchased — 9 98 9 Cost of stock repurchased $ — $ 42 $ 393 $ 42 Average price paid per share $ — $ 4.69 $ 3.97 $ 4.69
Schedule of Changes in Stockholders' Equity	The changes in stockholders’ equity by component for the three and six months ended June 27, 2020 and June 29, 2019, are as follows (in thousands): Three months ended June 27, 2020 Common Stock and Additional Paid-in Capital Treasury Stock Accumulated Other Comprehensive Income Accumulated Deficit Total Stockholders’ Equity Balance at March 28, 2020 $ 189,899 $ (29,551 ) $ 331 $ (65,010 ) $ 95,669 Common stock issued under employee plans 44 — — — 44 Shares withheld for net share settlement of RSUs (309 ) — — — (309 ) Equity-based compensation expense 656 — — — 656 Net income — — — 1,524 1,524 Other comprehensive income — — 71 — 71 Balance at June 27, 2020 $ 190,290 $ (29,551 ) $ 402 $ (63,486 ) $ 97,655 Six months ended June 27, 2020 Common Stock and Additional Paid-in Capital Treasury Stock Accumulated Other Comprehensive Income Accumulated Deficit Total Stockholders’ Equity Balance at December 28, 2019 $ 188,313 $ (29,158 ) $ 424 $ (63,786 ) $ 95,793 Common stock issued under employee plans 994 — — — 994 Shares withheld for net share settlement of RSUs (345 ) — — — (345 ) Equity-based compensation expense 1,328 — — — 1,328 Net income — — — 300 300 Other comprehensive loss — — (22 ) — (22 ) Common stock repurchases — (393 ) — — (393 ) Balance at June 27, 2020 $ 190,290 $ (29,551 ) $ 402 $ (63,486 ) $ 97,655 Three months ended June 29, 2019 Common Stock and Additional Paid-in Capital Treasury Stock Accumulated Other Comprehensive Income Accumulated Deficit Total Stockholders’ Equity Balance at March 30, 2019 $ 184,976 $ (29,047 ) $ 484 $ (67,326 ) $ 89,087 Shares withheld for net share settlement of RSUs (240 ) — — — (240 ) Equity-based compensation expense 753 — — — 753 Net loss — — — (1,182 ) (1,182 ) Other comprehensive loss — — (29 ) — (29 ) Common stock repurchases — (42 ) — — (42 ) Balance at June 29, 2019 $ 185,489 $ (29,089 ) $ 455 $ (68,508 ) $ 88,347 Six months ended June 29, 2019 Common Stock and Additional Paid-in Capital Treasury Stock Accumulated Other Comprehensive Income Accumulated Deficit Total Stockholders’ Equity Balance at December 29, 2018 $ 183,227 $ (29,047 ) $ 378 $ (64,934 ) $ 89,624 Common stock issued under employee plans 1,021 — — — 1,021 Shares withheld for net share settlement of RSUs (268 ) — — — (268 ) Equity-based compensation expense 1,509 — — — 1,509 Net loss — — — (3,574 ) (3,574 ) Other comprehensive income — — 77 — 77 Common stock repurchases — (42 ) — — (42 ) Balance at June 29, 2019 $ 185,489 $ (29,089 ) $ 455 $ (68,508 ) $ 88,347
Changes in Accumulated Other Comprehensive Income by Component	The changes in accumulated other comprehensive income by component for the three and six months ended June 27, 2020 and June 29, 2019, are as follows. Three Months Ended Six Months Ended June 27, 2020 Foreign Unrealized gain s available-for-sale Total Foreign Unrealized gains available-for-sale Total (In thousands) Beginning balance $ 286 $ 45 $ 331 $ 381 $ 43 $ 424 Other comprehensive income (loss) before reclassification 20 51 71 (75 ) 53 (22 ) Amounts reclassified from other comprehensive income — — — — — — Net current-period other comprehensive income (loss) 20 51 71 (75 ) 53 (22 ) Ending balance $ 306 $ 96 $ 402 $ 306 $ 96 $ 402 Three Months Ended Six Months Ended June 29, 2019 Foreign Unrealized available-for-sale Total Foreign Unrealized available-for-sale Total (In thousands) Beginning balance $ 466 $ 18 $ 484 $ 405 $ (27 ) $ 378 Other comprehensive income (loss) before reclassification (61 ) 32 (29 ) — 77 77 Amounts reclassified from other comprehensive income — — — — — — Net current-period other comprehensive income (loss) (61 ) 32 (29 ) — 77 77 Ending balance $ 405 $ 50 $ 455 $ 405 $ 50 $ 455

Net Loss Per Share (Tables)

Net Loss Per Share (Tables)	6 Months Ended
	Jun. 27, 2020
Earnings Per Share [Abstract]
Computation of Basic and Diluted Net Income Per Share	The following table sets forth the computation of basic and diluted net income (loss) per share: Three Months Ended Six Months Ended June 27, 2020 June 29, 2019 June 27, 2020 June 29, 2019 (In thousands, except per share amounts) Net income (loss) $ 1,524 $ (1,182 ) $ 300 $ (3,574 ) Weighted-average shares – basic 23,561 22,991 23,522 22,923 Effect of dilutive potential common shares 345 — 431 — Weighted-average shares – diluted 23,906 22,991 23,953 22,923 Net income (loss) per share – basic $ 0.06 $ (0.05 ) $ 0.01 $ (0.16 ) Net income (loss) per share –diluted $ 0.06 $ (0.05 ) $ 0.01 $ (0.16 )
Antidilutive Securities Excluded from Computation of Diluted Net Income Per Share	The following potentially dilutive securities were excluded (as common stock equivalents) from the computation of diluted net income (loss) per share for the periods presented as their effect would have been antidilutive: Three Months Ended Six Months Ended June 27, 2020 June 29, 2019 June 27, 2020 June 29, 2019 (In thousands) Stock options to purchase common stock 1,596 2,211 1,596 2,211 RSUs 19 583 19 583 Employee stock purchase plan 2 64 2 64

Segment Reporting (Tables)

Segment Reporting (Tables)	6 Months Ended
	Jun. 27, 2020
Segment Reporting [Abstract]
Information for Each Reportable Segment	Information for each reportable segment for the three and six months ended June 27, 2020 and June 29, 2019 is as follows: Net Revenues Three Months Ended Six Months Ended June 27, 2020 June 29, 2019 June 27, 2020 June 29, 2019 (In thousands) TFE $ 16,595 $ 13,264 $ 24,557 $ 32,209 Photonics 12,247 9,050 23,125 14,932 Total segment net revenues $ 28,842 $ 22,314 $ 47,682 $ 47,141 Operating Income (Loss) Three Months Ended Six Months Ended June 27, 2020 June 29, 2019 June 27, 2020 June 29, 2019 (In thousands) TFE $ (174 ) $ (1,291 ) $ (2,705 ) $ (1,892 ) Photonics 3,536 1,487 6,448 846 Total income (loss) from segment operations 3,362 196 3,743 (1,046 ) Unallocated costs (1,258 ) (1,124 ) (2,738 ) (1,879 ) Income (loss) from operations 2,104 (928 ) 1,005 (2,925 ) Interest income and other income (expense), net 62 163 204 322 Income (loss) before provision for income taxes $ 2,166 $ (765 ) $ 1,209 $ (2,603 )
Segment Assets	Total assets for each reportable segment as of June 27, 2020 and December 28, 2019 are as follows: Assets June 27, December 28, (In thousands) TFE $ 43,175 $ 51,153 Photonics 26,622 22,071 Total segment assets 69,797 73,244 Cash, cash equivalents and investments 43,983 42,024 Restricted cash 787 787 Deferred income taxes 5,826 6,252 Other current assets 1,207 752 Common property, plant and equipment 1,414 1,307 Common operating lease right-of-use 1,815 1,898 Other assets — 78 Consolidated total assets $ 124,829 $ 126,322

Description of Business, Basi_3

Description of Business, Basis of Presentation and Significant Accounting Policy - Additional Information (Detail) $ in Thousands	3 Months Ended
	Jun. 27, 2020USD ($)
Description of Business and Basis of Presentation and Significant Accounting Policies [Line Items]
Proceeds from government grants	$ 310
Cost of Sales [Member] | Grant [Member]
Description of Business and Basis of Presentation and Significant Accounting Policies [Line Items]
Proceeds from government grants	180
Research and Development Expense [Member] | Grant [Member]
Description of Business and Basis of Presentation and Significant Accounting Policies [Line Items]
Proceeds from government grants	49
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	$ 81

Revenue -Disaggregation of Reve

Revenue -Disaggregation of Revenue from Contracts with Customers (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 27, 2020	Jun. 29, 2019	Jun. 27, 2020	Jun. 29, 2019
Disaggregation of Revenue [Line Items]
Total net revenues	$ 28,842	$ 22,314	$ 47,682	$ 47,141
TFE
Disaggregation of Revenue [Line Items]
Total net revenues	16,595	13,264	24,557	32,209
TFE | Systems, Upgrades and Spare Parts
Disaggregation of Revenue [Line Items]
Total net revenues	15,287	12,441	21,856	29,864
TFE | Field Service
Disaggregation of Revenue [Line Items]
Total net revenues	1,308	823	2,701	2,345
Photonics
Disaggregation of Revenue [Line Items]
Total net revenues	12,247	9,050	23,125	14,932
HDD | TFE
Disaggregation of Revenue [Line Items]
Total net revenues	16,532	13,244	24,286	25,816
HDD | TFE | Systems, Upgrades and Spare Parts
Disaggregation of Revenue [Line Items]
Total net revenues	15,226	12,423	21,587	23,473
HDD | TFE | Field Service
Disaggregation of Revenue [Line Items]
Total net revenues	1,306	821	2,699	2,343
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		2
PV | TFE
Disaggregation of Revenue [Line Items]
Total net revenues	63	18	271	6,391
PV | TFE | Systems, Upgrades and Spare Parts
Disaggregation of Revenue [Line Items]
Total net revenues	61	18	269	6,391
PV | TFE | Field Service
Disaggregation of Revenue [Line Items]
Total net revenues			2
Military Products | Photonics
Disaggregation of Revenue [Line Items]
Total net revenues	5,446	2,981	10,811	4,794
Commercial Products | Photonics
Disaggregation of Revenue [Line Items]
Total net revenues	39	182	118	500
Repair and Other Services | Photonics
Disaggregation of Revenue [Line Items]
Total net revenues	645	810	1,075	1,371
Product | Photonics
Disaggregation of Revenue [Line Items]
Total net revenues	6,130	3,973	12,004	6,665
Firm Fixed Price [Member] | Photonics
Disaggregation of Revenue [Line Items]
Total net revenues	5,462	3,085	9,892	4,777
Cost Plus Fixed Fee [Member] | Photonics
Disaggregation of Revenue [Line Items]
Total net revenues	655	1,992	1,229	3,488
Times and Materials | Photonics
Disaggregation of Revenue [Line Items]
Total net revenues				2
Technology Development | Photonics
Disaggregation of Revenue [Line Items]
Total net revenues	$ 6,117	$ 5,077	$ 11,121	$ 8,267

Revenue - Primary Geography Mar

Revenue - Primary Geography Markets (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 27, 2020	Jun. 29, 2019	Jun. 27, 2020	Jun. 29, 2019
Disaggregation of Revenue [Line Items]
Total net revenues	$ 28,842	$ 22,314	$ 47,682	$ 47,141
Products Transferred at a Point in Time
Disaggregation of Revenue [Line Items]
Total net revenues	17,240	14,074	25,632	33,580
Products and Services Transferred Over Time
Disaggregation of Revenue [Line Items]
Total net revenues	11,602	8,240	22,050	13,561
United States
Disaggregation of Revenue [Line Items]
Total net revenues	12,438	9,167	23,813	15,044
Asia
Disaggregation of Revenue [Line Items]
Total net revenues	16,282	12,908	23,725	31,692
Europe
Disaggregation of Revenue [Line Items]
Total net revenues	122	239	144	405
TFE
Disaggregation of Revenue [Line Items]
Total net revenues	16,595	13,264	24,557	32,209
TFE | Products Transferred at a Point in Time
Disaggregation of Revenue [Line Items]
Total net revenues	16,595	13,264	24,557	32,209
TFE | United States
Disaggregation of Revenue [Line Items]
Total net revenues	313	356	832	517
TFE | Asia
Disaggregation of Revenue [Line Items]
Total net revenues	16,282	12,908	23,725	31,692
Photonics
Disaggregation of Revenue [Line Items]
Total net revenues	12,247	9,050	23,125	14,932
Photonics | Products Transferred at a Point in Time
Disaggregation of Revenue [Line Items]
Total net revenues	645	810	1,075	1,371
Photonics | Products and Services Transferred Over Time
Disaggregation of Revenue [Line Items]
Total net revenues	11,602	8,240	22,050	13,561
Photonics | United States
Disaggregation of Revenue [Line Items]
Total net revenues	12,125	8,811	22,981	14,527
Photonics | Asia
Disaggregation of Revenue [Line Items]
Total net revenues
Photonics | Europe
Disaggregation of Revenue [Line Items]
Total net revenues	$ 122	$ 239	$ 144	$ 405

Revenue - Changes in Contract A

Revenue - Changes in Contract Assets and Contract Liabilities (Detail) - USD ($) $ in Thousands	6 Months Ended
	Jun. 27, 2020	Dec. 28, 2019
TFE
Contract liabilities:
Contract liabilities	$ 897	$ 4,327
Contract liabilities:
Change in contract liabilities	(3,430)
TFE | Accounts Receivable, Unbilled
Contract assets:
Contract assets	560	760
Contract assets:
Change in contract assets	(200)
TFE | Deferred Revenue
Contract liabilities:
Contract liabilities	464	320
Contract liabilities:
Change in contract liabilities	144
TFE | Customer Advances
Contract liabilities:
Contract liabilities	433	4,007
Contract liabilities:
Change in contract liabilities	(3,574)
Photonics
Contract assets:
Contract assets	695	3,309
Contract assets:
Change in contract assets	(2,614)
Photonics | Accounts Receivable, Unbilled
Contract assets:
Contract assets	574	3,210
Contract assets:
Change in contract assets	(2,636)
Photonics | Deferred Revenue
Contract liabilities:
Contract liabilities	1,259
Contract liabilities:
Change in contract liabilities	1,259
Photonics | Retainage
Contract assets:
Contract assets	121	$ 99
Contract assets:
Change in contract assets	$ 22

Revenue - Additional Informatio

Revenue - Additional Information (Detail) $ in Thousands	6 Months Ended
	Jun. 27, 2020USD ($)Installment
Revenue From Contract With Customers [Line Items]
Revenue remaining performance obligation	$ 69,000
TFE
Revenue From Contract With Customers [Line Items]
Revenue remaining performance obligation	$ 14,600
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	55
Photonics
Revenue From Contract With Customers [Line Items]
Change in contract assets	(2,614)
Revenue remaining performance obligation	54,400
Photonics | Accounts Receivable, Unbilled
Revenue From Contract With Customers [Line Items]
Change in contract assets	$ (2,636)

Revenue - Additional Informat_2

Revenue - Additional Information (Detail 1)	Jun. 27, 2023	Jun. 27, 2022	Jun. 27, 2021	Jun. 27, 2020
Revenue From Contract With Customers [Line Items]
Revenue, remaining performance obligation, percentage				49.00%
Scenario Forecast
Revenue From Contract With Customers [Line Items]
Revenue, remaining performance obligation, percentage	8.00%	17.00%	26.00%

Inventories - Inventories State

Inventories - Inventories Stated at Lower of Average Cost or Net Realizable Value (Detail) - USD ($) $ in Thousands	Jun. 27, 2020	Dec. 28, 2019
Inventory Disclosure [Abstract]
Raw materials	$ 11,280	$ 15,286
Work-in-progress	4,363	4,748
Finished goods	6,567	4,873
Inventories	$ 22,210	$ 24,907

Equity-Based Compensation - Add

Equity-Based Compensation - Additional information (Detail) - USD ($)	Aug. 01, 2020	May 31, 2020	Jun. 29, 2019	Jun. 27, 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%			15.00%
Options granted under performance stock options				6,000
Stock issued under Employee Stock Purchase Plans				189,833
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		584,289

Equity-Based Compensation - Eff

Equity-Based Compensation - Effect of Recording Equity-Based Compensation (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 27, 2020	Jun. 29, 2019	Jun. 27, 2020	Jun. 29, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity-based compensation	$ 656	$ 753	$ 1,328	$ 1,509
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity-based compensation	149	191	364	398
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity-based compensation	450	352	816	642
Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity-based compensation	$ 57	$ 210	$ 148	$ 469

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		6 Months Ended
	Jun. 27, 2020	Jun. 29, 2019	Jun. 27, 2020	Jun. 29, 2019
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average fair value of grants per share	$ 0	$ 2.05	$ 1.82	$ 2.06
Expected volatility	0.00%	43.19%	46.06%	43.20%
Risk free interest rate	0.00%	1.86%	0.44%	1.88%
Expected term of options (in years)		4 years 7 months 6 days	4 years 4 months 20 days	4 years 7 months 6 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			$ 1.66	$ 1.89
Expected volatility			36.69%	50.00%
Risk free interest rate			1.56%	2.53%
Expected term of options (in years)			6 months	1 year
Dividend yield			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	3 Months Ended
	Jun. 27, 2020	Jun. 29, 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)	6 Months Ended
	Jun. 27, 2020$ / sharesshares
Shares
Options outstanding at December 28, 2019 | shares	2,096,610
Options granted | shares	6,000
Options cancelled and forfeited | shares	(13,742)
Options exercised | shares	(51,097)
Options outstanding at June 27, 2020 | shares	2,037,771
Options exercisable at June 27, 2020 | shares	1,541,989
Weighted-Average Exercise Price
Options outstanding at December 28, 2019 | $ / shares	$ 6.63
Options granted | $ / shares	4.88
Options cancelled and forfeited | $ / shares	5.80
Options exercised | $ / shares	4.69
Options outstanding at June 27, 2020 | $ / shares	6.68
Options exercisable at June 27, 2020 | $ / shares	$ 6.78

Equity-Based Compensation - Sum

Equity-Based Compensation - Summary of Restricted Stock Units Activity (Detail) - Restricted Stock Units (RSUs) - $ / shares	1 Months Ended	6 Months Ended
	May 31, 2020	Jun. 27, 2020
Shares
Non-vested RSUs at December 28, 2019		553,355
Granted	109,465	584,289
Vested		(212,848)
Cancelled		(6,304)
Non-vested RSUs at june 27, 2020		918,492
Weighted Average Grant Date Fair Value
Non-vested RSUs at December 28, 2019		$ 6.15
Granted		4.72
Vested		6.54
Cancelled		6.13
Non-vested RSUs at June 27, 2020		$ 5.15

Purchased Intangible Assets - A

Purchased Intangible Assets - Additional Information (Detail) - USD ($)	3 Months Ended	6 Months Ended
	Jun. 27, 2020	Jun. 27, 2020
Business Combination Segment Allocation [Line Items]
Total amortization expense of finite-lived intangibles	$ 106,000	$ 260,000

Purchased Intangible Assets - D

Purchased Intangible Assets - Details of Finite-lived Intangible Assets by Segment (Detail) - USD ($) $ in Thousands	Jun. 27, 2020	Dec. 28, 2019
Finite-Lived Intangible Assets [Line Items]
Finite Lived, Gross Carrying Amount	$ 8,387
Accumulated Amortization	(8,373)	$ (8,113)
Finite Lived, Net Carrying Amount	14	$ 274
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	(1,201)
Finite Lived, Net Carrying Amount	$ 14

Purchased Intangible Assets - F

Purchased Intangible Assets - Future Amortization Expense (Detail) $ in Thousands	Jun. 27, 2020USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
2020	$ 14

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) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 29, 2019	Jun. 29, 2019
Business Combinations [Abstract]
Beginning balance	$ 132	$ 223
Changes in fair value		7
Cash payments made	(132)	(230)
Ending balance

Warranty - Additional Informati

Warranty - Additional Information (Detail)	6 Months Ended
	Jun. 27, 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		6 Months Ended
	Jun. 27, 2020	Jun. 29, 2019	Jun. 27, 2020	Jun. 29, 2019
Guarantees [Abstract]
Opening balance	$ 725	$ 1,297	$ 1,022	$ 997
Expenditures incurred under warranties	(189)	(257)	(308)	(424)
Accruals for product warranties issued during the reporting period	135	78	159	402
Adjustments to previously existing warranty accruals	(9)	(170)	(211)	(27)
Closing balance	$ 662	$ 948	$ 662	$ 948

Warranty - Balance Sheet Classi

Warranty - Balance Sheet Classification of Warranty Provision Account (Detail) - USD ($) $ in Thousands	Jun. 27, 2020	Mar. 28, 2020	Dec. 28, 2019	Jun. 29, 2019	Mar. 29, 2019	Dec. 29, 2018
Guarantees [Abstract]
Other accrued liabilities	$ 487		$ 846
Other long-term liabilities	175		176
Total warranty provision	$ 662	$ 725	$ 1,022	$ 948	$ 1,297	$ 997

Guarantees - Additional Informa

Guarantees - Additional Information (Detail)	Jun. 27, 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	Jun. 27, 2020	Dec. 28, 2019
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 43,887	$ 41,981
Unrealized Holding Gains	98	43
Unrealized Holding Losses	2	0
Fair Value	43,983	42,024
Cash and Cash Equivalents
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	23,944	19,767
Fair Value	23,944	19,767
Cash and Cash Equivalents | Cash
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	19,185	16,512
Fair Value	19,185	16,512
Cash and Cash Equivalents | Money market funds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	4,759	3,255
Fair Value	4,759	3,255
Short-term Investments
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	14,391	16,691
Unrealized Holding Gains	46	29
Unrealized Holding Losses	2	0
Fair Value	14,435	16,720
Short-term Investments | Corporate bonds and medium-term notes
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	3,846	6,383
Unrealized Holding Gains	33	25
Unrealized Holding Losses	1	0
Fair Value	3,878	6,408
Short-term Investments | U.S. treasury and agency securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	3,448	5,417
Unrealized Holding Gains	1	1
Fair Value	3,449	5,418
Short-term Investments | Certificates of deposit
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	5,200	3,000
Unrealized Holding Gains	10	1
Unrealized Holding Losses	1	0
Fair Value	5,209	3,001
Short-term Investments | Commercial paper
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	1,897	1,891
Unrealized Holding Gains	2	2
Unrealized Holding Losses		0
Fair Value	1,899	1,893
Long-term Investments
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	5,552	5,523
Unrealized Holding Gains	52	14
Unrealized Holding Losses		0
Fair Value	5,604	5,537
Long-term Investments | Corporate bonds and medium-term notes
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	2,056	2,530
Unrealized Holding Gains	9	12
Unrealized Holding Losses		0
Fair Value	2,065	2,542
Long-term Investments | U.S. treasury and agency securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	2,496	2,494
Unrealized Holding Gains	43	1
Unrealized Holding Losses		0
Fair Value	2,539	2,495
Long-term Investments | Certificates of deposit
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	1,000	499
Unrealized Holding Gains		1
Unrealized Holding Losses
Fair Value	$ 1,000	$ 500

Cash, Cash Equivalents and In_4

Cash, Cash Equivalents and Investments - Contractual Maturities of Available-For-Sale Securities (Detail) $ in Thousands	Jun. 27, 2020USD ($)
Investments Debt And Equity Securities [Abstract]
Amortized Cost, Due in one year or less	$ 19,150
Amortized Cost, Due after one through five years	5,552
Amortized Cost	24,702
Fair Value, Due in one year or less	19,194
Fair Value, Due after one through five years	5,604
Fair Value	$ 24,798

Cash, Cash Equivalents and In_5

Cash, Cash Equivalents and Investments - Fair Market Value of Investments with Unrealized Losses Not Deemed to be Other-Than Temporarily Impaired (Detail) $ in Thousands	Jun. 27, 2020USD ($)
Debt Securities, Available-for-sale [Line Items]
Unrealized Loss Position, Less than 12 Months, Fair Value	$ 3,226
Unrealized Loss Position, Less than 12 Months, Gross Unrealized Losses	2
Unrealized Loss Position, Greater than 12 Months, Fair Value	0
Unrealized Loss Position, Greater than 12 Months, Gross Unrealized Losses	0
Certificates of deposit
Debt Securities, Available-for-sale [Line Items]
Unrealized Loss Position, Less than 12 Months, Fair Value	2,199
Unrealized Loss Position, Less than 12 Months, Gross Unrealized Losses	1
Unrealized Loss Position, Greater than 12 Months, Fair Value	0
Unrealized Loss Position, Greater than 12 Months, Gross Unrealized Losses	0
Corporate bonds and medium-term notes
Debt Securities, Available-for-sale [Line Items]
Unrealized Loss Position, Less than 12 Months, Fair Value	1,027
Unrealized Loss Position, Less than 12 Months, Gross Unrealized Losses	1
Unrealized Loss Position, Greater than 12 Months, Fair Value	0
Unrealized Loss Position, Greater than 12 Months, Gross Unrealized Losses	$ 0

Cash, Cash Equivalents and In_6

Cash, Cash Equivalents and Investments - Fair Value Hierarchy of Available-for-Sale Securities Measured at Fair Value on Recurring Basis (Detail) $ in Thousands	Jun. 27, 2020USD ($)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total recurring fair value measurements	$ 24,798
Fair Value, Measurements, Recurring
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total recurring fair value measurements	24,798
Fair Value, Measurements, Recurring | Money market funds
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total recurring fair value measurements	4,759
Fair Value, Measurements, Recurring | Certificates of deposit
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total recurring fair value measurements	6,209
Fair Value, Measurements, Recurring | Commercial paper
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total recurring fair value measurements	1,899
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	5,988
Fair Value, Measurements, Recurring | Corporate bonds and medium-term notes
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total recurring fair value measurements	5,943
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	10,747
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 | Money market funds
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total recurring fair value measurements	4,759
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	5,988
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	14,051
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Certificates of deposit
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total recurring fair value measurements	6,209
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	1,899
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Corporate bonds and medium-term notes
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total recurring fair value measurements	$ 5,943

Derivative Instruments - Additi

Derivative Instruments - Additional Information (Detail)	6 Months Ended
	Jun. 27, 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	Jun. 27, 2020	Dec. 28, 2019
Derivatives, Fair Value [Line Items]
Notional Amounts	$ 574	$ 1,035
Derivative Liabilities	2	4
Forward Foreign Currency Contracts
Derivatives, Fair Value [Line Items]
Notional Amounts	574	1,035
Derivative Liabilities	$ 2	$ 4

Equity - Schedule of Changes in

Equity - Schedule of Changes in Stockholders' Equity (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 27, 2020	Jun. 29, 2019	Jun. 27, 2020	Jun. 29, 2019
Class of Stock [Line Items]
Beginning balance	$ 95,669	$ 89,087	$ 95,793	$ 89,624
Common stock issued under employee plans	44		994	1,021
Shares withheld for net share settlement of RSUs	(309)	(240)	(345)	(268)
Equity-based compensation expense	656	753	1,328	1,509
Net income (loss)	1,524	(1,182)	300	(3,574)
Other comprehensive loss	71	(29)	(22)	77
Common stock repurchases	0	(42)	(393)	(42)
Ending balance	97,655	88,347	97,655	88,347
Common Stock and Additional Paid-in Capital
Class of Stock [Line Items]
Beginning balance	189,899	184,976	188,313	183,227
Common stock issued under employee plans	44		994	1,021
Shares withheld for net share settlement of RSUs	(309)	(240)	(345)	(268)
Equity-based compensation expense	656	753	1,328	1,509
Ending balance	190,290	185,489	190,290	185,489
Treasury Stock
Class of Stock [Line Items]
Beginning balance	(29,551)	(29,047)	(29,158)	(29,047)
Common stock repurchases		(42)	(393)	(42)
Ending balance	(29,551)	(29,089)	(29,551)	(29,089)
Accumulated Other Comprehensive Income
Class of Stock [Line Items]
Beginning balance	331	484	424	378
Other comprehensive loss	71	(29)	(22)	77
Ending balance	402	455	402	455
Accumulated Deficit
Class of Stock [Line Items]
Beginning balance	(65,010)	(67,326)	(63,786)	(64,934)
Net income (loss)	1,524	(1,182)	300	(3,574)
Ending balance	$ (63,486)	$ (68,508)	$ (63,486)	$ (68,508)

Equity - Changes in Accumulated

Equity - Changes in Accumulated Other Comprehensive Income by Component (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 27, 2020	Jun. 29, 2019	Jun. 27, 2020	Jun. 29, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	$ 95,669	$ 89,087	$ 95,793	$ 89,624
Other comprehensive income (loss), net of tax	71	(29)	(22)	77
Ending balance	97,655	88,347	97,655	88,347
Foreign currency
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	286	466	381	405
Other comprehensive income (loss) before reclassification	20	(61)	(75)	0
Other comprehensive income (loss), net of tax	20	(61)	(75)	0
Ending balance	306	405	306	405
Unrealized holding gains (losses) on available- for-sale investments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	45	18	43	(27)
Other comprehensive income (loss) before reclassification	51	32	53	77
Other comprehensive income (loss), net of tax	51	32	53	77
Ending balance	96	50	96	50
Accumulated Other Comprehensive Income
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	331	484	424	378
Other comprehensive income (loss) before reclassification	71	(29)	(22)	77
Other comprehensive income (loss), net of tax	71	(29)	(22)	77
Ending balance	$ 402	$ 455	$ 402	$ 455

Equity - Additional Information

Equity - Additional Information (Detail) - USD ($) $ in Millions	Aug. 15, 2018	Jun. 27, 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		6 Months Ended
	Jun. 27, 2020	Jun. 29, 2019	Jun. 27, 2020	Jun. 29, 2019
Equity [Abstract]
Shares of common stock repurchased	0	9	98	9
Cost of stock repurchased	$ 0	$ 42	$ 393	$ 42
Average price paid per share	$ 0	$ 4.69	$ 3.97	$ 4.69

Net Income (Loss) Per Share - C

Net Income (Loss) Per Share - Computation of Basic and Diluted Net Income Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 27, 2020	Jun. 29, 2019	Jun. 27, 2020	Jun. 29, 2019
Earnings Per Share [Abstract]
Net income (loss)	$ 1,524	$ (1,182)	$ 300	$ (3,574)
Weighted-average shares – basic	23,561	22,991	23,522	22,923
Effect of dilutive potential common shares	345	0	431	0
Weighted-average shares – diluted	23,906	22,991	23,953	22,923
Net income (loss) per share – basic	$ 0.06	$ (0.05)	$ 0.01	$ (0.16)
Net income (loss) per share –diluted	$ 0.06	$ (0.05)	$ 0.01	$ (0.16)

Net Income (Loss) Per Share - A

Net Income (Loss) Per Share - Antidilutive Securities Excluded from Computation of Diluted Net Income Per Share (Detail) - shares shares in Thousands	3 Months Ended		6 Months Ended
	Jun. 27, 2020	Jun. 29, 2019	Jun. 27, 2020	Jun. 29, 2019
Stock Options
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of diluted net income per share	1,596	2,211	1,596	2,211
Restricted Stock Units (RSUs)
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of diluted net income per share	19	583	19	583
Employee Stock Purchase Plan
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of diluted net income per share	2	64	2	64

Segment Reporting - Additional

Segment Reporting - Additional Information (Detail)	6 Months Ended
	Jun. 27, 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		6 Months Ended
	Jun. 27, 2020	Jun. 29, 2019	Jun. 27, 2020	Jun. 29, 2019
Segment Reporting Information [Line Items]
Total segment net revenues	$ 28,842	$ 22,314	$ 47,682	$ 47,141
Operating income (loss)	2,104	(928)	1,005	(2,925)
Interest income	62	163	204	322
Income (loss) before provision for income taxes	2,166	(765)	1,209	(2,603)
TFE
Segment Reporting Information [Line Items]
Total segment net revenues	16,595	13,264	24,557	32,209
Photonics
Segment Reporting Information [Line Items]
Total segment net revenues	12,247	9,050	23,125	14,932
Operating Segments
Segment Reporting Information [Line Items]
Operating income (loss)	3,362	196	3,743	(1,046)
Operating Segments | TFE
Segment Reporting Information [Line Items]
Operating income (loss)	(174)	(1,291)	(2,705)	(1,892)
Operating Segments | Photonics
Segment Reporting Information [Line Items]
Operating income (loss)	3,536	1,487	6,448	846
Unallocated Amount to Segment
Segment Reporting Information [Line Items]
Unallocated costs	$ (1,258)	$ (1,124)	$ (2,738)	$ (1,879)

Segment Reporting - Assets for

Segment Reporting - Assets for Each Reportable Segment (Detail) - USD ($) $ in Thousands	Jun. 27, 2020	Dec. 28, 2019
Segment Reporting, Asset Reconciling Item [Line Items]
Consolidated total assets	$ 124,829	$ 126,322
Cash and investments	43,983	42,024
Restricted cash	787	787
Deferred income taxes	5,826	6,252
Other current assets	1,207	752
Common property, plant and equipment	1,414	1,307
Common operating lease right-of-use assets	1,815	1,898
Other assets	0	78
Operating Segments
Segment Reporting, Asset Reconciling Item [Line Items]
Consolidated total assets	69,797	73,244
Operating Segments | TFE
Segment Reporting, Asset Reconciling Item [Line Items]
Consolidated total assets	43,175	51,153
Operating Segments | Photonics
Segment Reporting, Asset Reconciling Item [Line Items]
Consolidated total assets	$ 26,622	$ 22,071

Income Taxes - Additional Infor

Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	Jul. 31, 2020	Jun. 27, 2020	Jun. 29, 2019	Jun. 27, 2020	Jun. 29, 2019	Dec. 29, 2020	Dec. 31, 2020	Mar. 27, 2020
Government Grants [Line Items]
Provision for income taxes		$ 642	$ 417	$ 909	$ 971
Income tax provision on earnings of subsidiaries		369	201	548	563
Deferred payroll tax liability		252		252			$ 719	$ 719
Proceeds From Government Grants		310
Subsequent Event [Member]
Government Grants [Line Items]
Proceeds from Income Tax Refunds	$ 157
Grant [Member] | Cost of Sales [Member]
Government Grants [Line Items]
Proceeds From Government Grants		180
Grant [Member] | Research and Development Expense [Member]
Government Grants [Line Items]
Proceeds From Government Grants		49
Grant [Member] | Selling, General and Administrative Expenses [Member]
Government Grants [Line Items]
Proceeds From Government Grants		81
Forecast [Member]
Government Grants [Line Items]
Proceeds From Government Grants						$ 535
Foreign Tax Authority | Singapore
Government Grants [Line Items]
Income tax charge (benefit)		$ 272	$ 213	$ 373	$ 404