PC Tel (PCTI) 10-Q 9 Nov 21 2021 Q3 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2021	Nov. 09, 2021
Cover [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2021
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q3
Entity Registrant Name	PCTEL, Inc.
Entity Central Index Key	0001057083
Entity Incorporation, State or Country Code	DE
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	false
Entity Shell Company	false
Title of 12(b) Security	Common Stock
Trading Symbol	PCTI
Security Exchange Name	NASDAQ
Entity File Number	000-27115
Entity Tax Identification Number	77-0364943
Entity Address, Address Line One	471 Brighton Drive
Entity Address, City or Town	Bloomingdale
Entity Address, State or Province	IL
Entity Address, Postal Zip Code	60108
City Area Code	630
Local Phone Number	372-6800
Entity Common Stock Shares Outstanding		18,239,387
Document Quarterly Report	true
Document Transition Report	false

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets (unaudited) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
ASSETS
Cash and cash equivalents	$ 9,772	$ 5,761
Short-term investment securities	22,680	30,582
Accounts receivable, net of allowances of $62 and $113 at September 30, 2021 and December 31, 2020, respectively	15,846	16,601
Inventories, net	12,983	9,984
Prepaid expenses and other assets	1,282	1,685
Total current assets	62,563	64,613
Property and equipment, net	12,369	12,505
Long-term investment securities	0	4,640
Goodwill	6,429	3,332
Intangible assets, net	1,727	0
Other noncurrent assets	2,479	2,441
TOTAL ASSETS	85,567	87,531
LIABILITIES AND STOCKHOLDERS’ EQUITY
Accounts payable	4,615	4,430
Accrued liabilities	10,269	7,316
Total current liabilities	14,884	11,746
Long-term liabilities	4,238	4,387
Total liabilities	19,122	16,133
Stockholders’ equity:
Common stock, $0.001 par value, 50,000,000 shares authorized at September 30, 2021 and December 31, 2020, respectively, and 18,159,628 and 18,429,350 shares issued and outstanding at September 30, 2021 and December 31, 2020, respectively	18	18
Additional paid-in capital	123,702	128,250
Accumulated deficit	(57,055)	(56,888)
Accumulated other comprehensive (loss) income	(220)	18
Total stockholders’ equity	66,445	71,398
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	$ 85,567	$ 87,531

Condensed Consolidated Balanc_2

Condensed Consolidated Balance Sheets (Parenthetical) (unaudited) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Statement Of Financial Position [Abstract]
Allowance for accounts receivable	$ 62	$ 113
Common stock, par value	$ 0.001	$ 0.001
Common stock, shares authorized	50,000,000	50,000,000
Common stock, shares issued	18,159,628	18,429,350
Common stock, shares outstanding	18,159,628	18,429,350

Condensed Consolidated Statemen

Condensed Consolidated Statements of Operations (unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Income Statement [Abstract]
REVENUES	$ 22,411	$ 18,923	$ 61,799	$ 56,271
COST OF REVENUES	12,157	9,348	33,266	28,960
GROSS PROFIT	10,254	9,575	28,533	27,311
OPERATING EXPENSES:
Research and development	3,338	3,216	9,754	9,315
Sales and marketing	3,347	2,640	9,497	8,179
General and administrative	2,817	2,559	9,228	8,306
Amortization of intangible assets	80	0	135	32
Restructuring expenses	(1)	25	59	124
Total operating expenses	9,581	8,440	28,673	25,956
OPERATING INCOME (LOSS)	673	1,135	(140)	1,355
Other (expense) income, net	(4)	(84)	(10)	216
INCOME (LOSS) BEFORE INCOME TAXES	669	1,051	(150)	1,571
Expense for income taxes	5	9	17	25
NET INCOME (LOSS)	$ 664	$ 1,042	$ (167)	$ 1,546
Net Income (Loss) per Share:
Basic	$ 0.04	$ 0.06	$ (0.01)	$ 0.09
Diluted	$ 0.04	$ 0.06	$ (0.01)	$ 0.08
Weighted Average Shares:
Basic	17,945,053	18,198,567	18,077,506	18,184,441
Diluted	17,961,686	18,310,772	18,077,506	18,381,656
Cash dividend per share	$ 0.055	$ 0.055	$ 0.165	$ 0.165

Condensed Consolidated Statem_2

Condensed Consolidated Statements of Comprehensive Income (Loss) (unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Statement Of Income And Comprehensive Income [Abstract]
NET INCOME (LOSS)	$ 664	$ 1,042	$ (167)	$ 1,546
OTHER COMPREHENSIVE (LOSS) INCOME:
Foreign currency translation adjustments	(152)	206	(238)	132
COMPREHENSIVE INCOME (LOSS)	$ 512	$ 1,248	$ (405)	$ 1,678

Condensed Consolidated Statem_3

Condensed Consolidated Statements of Stockholders' Equity (unaudited) - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid - In Capital [Member]	Accumulated Deficit [Member]	Accumulated Other Comprehensive Income (Loss) [Member]
BALANCE at beginning of year at Dec. 31, 2019	$ 73,350	$ 19	$ 133,954	$ (60,305)	$ (318)
Stock-based compensation expense	1,996	1	1,995	0	0
Issuance of shares for stock purchase plans and stock options	504	0	504	0	0
Cancellation of shares for payment of withholding tax	(1,108)	0	(1,108)	0	0
Repurchase of common stock	(2,000)	(1)	(1,999)	0	0
Dividends paid	(3,079)	0	(3,079)	0	0
Net (loss) income	1,546	0	0	1,546	0
Change in cumulative translation adjustment, net	132	0	0	0	132
BALANCE at end of year at Sep. 30, 2020	71,341	19	130,267	(58,759)	(186)
BALANCE at beginning of year at Jun. 30, 2020	70,679	19	130,853	(59,801)	(392)
Stock-based compensation expense	433	0	433	0	0
Issuance of shares for stock purchase plans and stock options	8	0	8	0	0
Cancellation of shares for payment of withholding tax	(2)	0	(2)	0	0
Dividends paid	(1,025)	0	(1,025)	0	0
Net (loss) income	1,042	0	0	1,042	0
Change in cumulative translation adjustment, net	206	0	0	0	206
BALANCE at end of year at Sep. 30, 2020	71,341	19	130,267	(58,759)	(186)
BALANCE at beginning of year at Dec. 31, 2020	71,398	18	128,250	(56,888)	18
Stock-based compensation expense	2,029	1	2,028	0	0
Issuance of shares for stock purchase plans and stock options	418	0	418	0	0
Cancellation of shares for payment of withholding tax	(782)	0	(782)	0	0
Repurchase of common stock	(3,193)	(1)	(3,192)	0	0
Dividends paid	(3,020)	0	(3,020)	0	0
Net (loss) income	(167)	0	0	(167)	0
Change in cumulative translation adjustment, net	(238)	0	0	0	(238)
BALANCE at end of year at Sep. 30, 2021	66,445	18	123,702	(57,055)	(220)
BALANCE at beginning of year at Jun. 30, 2021	69,023	19	126,791	(57,719)	(68)
Stock-based compensation expense	372	0	372	0	0
Repurchase of common stock	(2,460)	(1)	(2,459)	0	0
Dividends paid	(1,002)	0	(1,002)	0	0
Net (loss) income	664	0	0	664	0
Change in cumulative translation adjustment, net	(152)	0	0	0	(152)
BALANCE at end of year at Sep. 30, 2021	$ 66,445	$ 18	$ 123,702	$ (57,055)	$ (220)

Condensed Consolidated Statem_4

Condensed Consolidated Statements of Stockholders' Equity (Parenthetical) (unaudited) - $ / shares	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Statement Of Stockholders Equity [Abstract]
Cash dividend per share	$ 0.055	$ 0.055	$ 0.165	$ 0.165

Condensed Consolidated Statem_5

Condensed Consolidated Statements of Cash Flows (unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Operating Activities:
Net (loss) income	$ (167)	$ 1,546
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Depreciation and amortization	2,257	2,260
Intangible asset amortization	171	144
Stock-based compensation	2,029	1,996
Loss on disposal of property and equipment	3	7
Restructuring costs	(15)	(40)
Bad debt provision	(39)	(164)
Changes in operating assets and liabilities:
Accounts receivable	2,162	3,599
Inventories	(1,734)	1,691
Prepaid expenses and other assets	932	1,058
Accounts payable	(700)	(1,210)
Income taxes payable	(15)	(12)
Other accrued liabilities	1,405	(269)
Deferred revenue	82	13
Net cash provided by operating activities	6,371	10,619
Investing Activities:
Capital expenditures	(2,006)	(3,373)
Purchase of investments	(21,124)	(40,038)
Redemptions/maturities of short-term investments	33,666	35,756
Cash paid for acquisition, net of cash acquired	(6,277)	0
Net cash provided by (used in) investing activities	4,259	(7,655)
Financing Activities:
Proceeds from issuance of common stock	418	504
Proceeds from Paycheck Protection Program Loan	0	3,500
Repayment of Paycheck Protection Program Loan	0	(3,500)
Payment of withholding tax on stock-based compensation	(782)	(1,108)
Principle payments on finance leases	(54)	(59)
Purchase of common stock from repurchase program	(3,193)	(2,000)
Cash dividends	(3,020)	(3,079)
Net cash used in financing activities	(6,631)	(5,742)
Net increase (decrease) in cash and cash equivalents	3,999	(2,778)
Effect of exchange rate changes on cash	12	113
Cash and cash equivalents, beginning of period	5,761	7,094
Cash and Cash Equivalents, End of Period	$ 9,772	$ 4,429

Basis of Presentation

Basis of Presentation	9 Months Ended
	Sep. 30, 2021
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Basis of Presentation	1. Basis of Presentation The accompanying unaudited interim condensed consolidated financial statements have been prepared in accordance with United States generally accepted accounting principles (“U.S. GAAP”) for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all the information and footnotes required by U.S. GAAP for complete financial statements. In the opinion of management, all adjustments of a normal, recurring nature that are Throughout this Quarterly Report on Form 10-Q, including under Part 1, Item 2, “Management’s Discussion and Analysis of Financial Condition and Results of Operations,” we disclose certain measures that the Company has taken in response to the macroeconomic impacts of the ongoing coronavirus (“COVID-19”) and the ensuing supply chain disruption. The full extent to which the COVID-19 pandemic will directly or indirectly impact the Company’s business, results of operations and financial condition will depend on future developments that remain highly uncertain at this time. Nature of Operations PCTEL, Inc. (PCTEL or the Company) was incorporated in California in 1994 and reincorporated in Delaware in 1998. The Company is a leading global provider of wireless technology, including purpose-built Industrial Internet of Things (“IoT”) devices, antenna systems, and test and measurement solutions. The Company has expertise in radio frequency (“RF”), digital and mechanical engineering. This expertise enables the Company to solve complex wireless challenges. The Company has two businesses (antennas & Industrial IoT devices and test & measurement products) that address three market segments: Enterprise Wireless, Intelligent Transportation, and Industrial IoT. The Company’s principal executive offices are located at 471 Brighton Drive, Bloomingdale, Illinois 60108. The telephone number at that address is (630) 372-6800 and the website is www.pctel.com. Additional information about the Company can be obtained on the Company’s website; however, the information within, or that can be accessed through, the Company’s website, is not part of this Quarterly Report on Form 10-Q. Basis of Consolidation The unaudited interim condensed consolidated financial statements of the Company include the condensed consolidated balance sheets as of September 30, 2021 and December 31, 2020, the condensed consolidated statements of cash flows for the nine months ended September 30, 2021 and 2020, the condensed consolidated statements of operations, condensed consolidated statements of comprehensive income (loss), and the condensed consolidated statements of stockholders’ equity for the three and nine months ended September 30, 2021 and 2020, respectively. The interim condensed consolidated financial statements are unaudited and reflect all adjustments of a normal recurring nature that are, in the opinion of management, necessary for a fair presentation of the interim period financial statements. The condensed consolidated balance sheet as of December 31, 2020 is derived from the audited financial statements as of December 31, 2020. The unaudited interim condensed consolidated financial statements of the Company have been prepared pursuant to the rules and regulations of the Securities and Exchange Commission (“SEC”). Accordingly, certain information and footnote disclosures normally included in financial statements prepared in accordance with U.S. GAAP have been condensed or omitted. The significant accounting policies followed by the Company are set forth in the 2020 Form 10-K. There were no material changes in the Company’s significant accounting policies during the three and nine months ended September 30, 2021. In addition, the Company reaffirms the use of estimates in the preparation of the financial statements as set forth in the 2020 Form 10-K. These unaudited interim condensed consolidated financial statements should be read in conjunction with the Company’s audited consolidated financial statements and notes thereto included in the 2020 Form 10-K. The results of operations for the period ended September 30, 2021 may not be indicative of the results for the period ending December 31, 2021. Foreign Operations Cross-border transactions, both with external parties and in our internal operations, result in exposure to foreign exchange rate fluctuations. We are exposed to currency risk with the Chinese Yuan due to our operations in China, and with other foreign currencies related to the acquisition of Smarteq (see Note 4) and related to suppliers and employees outside the U.S. Fluctuations could have an adverse effect on our results of operations and cash flows. We manage certain operating activities at the local level with revenues, costs, assets, and liabilities generally being denominated in local currencies. However, our results of operations and assets and liabilities are reported in U.S. dollars and thus will fluctuate with changes in exchange rates between such local currencies and the U.S. dollar . Gains and losses resulting from transactions originally in foreign currencies and then translated into U.S. dollars are included in the condensed consolidated statements of operations . For the nine months ended September 30 , 202 1 , approximately 9 % of revenues and 20 % of expenses were transacted in foreign currencies as compared to 3 % and % for the nine months ended September 3 0 , 20 20 . Net foreign exchange losses resulting from foreign currency transactions included in other income, net were $ ( 10 ) and $ ( 158 ) for the three months ended September 30, 2021 and 2020, respectively. Net foreign exchange gains (losses) resulting from foreign currency transactions included in other income, net was $ ( 54 ) and $ (139) for the nine months ended September 30 , 202 1 and 2020 , respectively. Recent Accounting Pronouncements In January 2017, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”), Intangibles-Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment (ASU 2017-14). This guidance eliminates the requirement to calculate the implied fair value of goodwill to measure a goodwill impairment charge. Instead, entities will record an impairment charge based on the excess of a reporting unit’s carrying amount over its fair value. The changes are effective for smaller reporting companies for fiscal years beginning after December 15, 2022, including interim periods within those fiscal years, and early adoption is permitted. The Company is currently evaluating the impact that this guidance will have on its consolidated financial statements. In March 2020, the FASB issued ASU 2020-04, Reference Rate Reform (“Topic 848”): Facilitation of the Effects of Reference Rate Reform on Financial Reporting. This update provides optional expedients and exceptions for applying U.S. GAAP to certain contract modifications and hedging relationships that reference London Inter-bank Offered Rate (LIBOR) or another reference rate expected to be discontinued. Topic 848 is effective upon issuance and generally can be applied through December 31, 2022. The Company is currently evaluating the impact of Topic 848 on the consolidated financial statements.

Fair Value of Financial Instrum

Fair Value of Financial Instruments	9 Months Ended
	Sep. 30, 2021
Fair Value Disclosures [Abstract]
Fair Value of Financial Instruments	2. Fair Value of Financial Instruments The Company follows accounting guidance for fair value measurements and disclosures, which establishes a fair value hierarchy that requires the Company to maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value. Fair value is a market-based measurement that should be determined based on assumptions that market participants would use in pricing an asset or liability. As a basis for considering such assumptions, a three-tier fair value hierarchy has been established, which prioritizes the inputs used in measuring fair value as follows: Level 1: inputs are unadjusted quoted prices in active markets for identical assets or liabilities. Level 2: inputs other than Level 1 that are observable, either directly or indirectly, such as quoted prices in active markets for similar assets and liabilities, quoted prices for identical or similar assets or liabilities in markets that are not active, or other inputs that are observable or can be corroborated by observable market data for substantially the full term of assets or liabilities. Level 3: unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities. Cash equivalents are measured at fair value and investments are recognized at amortized cost in the Company’s financial statements. Accounts receivable is a financial asset with a carrying value that approximates fair value due to the short-term nature of these assets. Accounts payable, accrued employee compensation and certain operating liabilities are financial liabilities with a carrying value that approximates fair value due to the short-term nature of these liabilities.

Income (Loss) per Share

Income (Loss) per Share	9 Months Ended
	Sep. 30, 2021
Earnings Per Share [Abstract]
Income (Loss) per Share	3. Income (Loss) per Share The following table is the computation of basic and diluted income per share: Three Months Ended September 30, Nine Months Ended September 30, 2021 2020 2021 2020 Basic Income Per Share computation: Numerator: Net income (loss) $ 664 $ 1,042 $ (167 ) $ 1,546 Denominator: Weighted shares outstanding - basic 17,945,053 18,198,567 18,077,506 18,184,441 Net income per common share - basic Net income (loss) $ 0.04 $ 0.06 $ (0.01 ) $ 0.09 Diluted Income Per Share computation: Denominator: Weighted shares outstanding - basic 17,945,053 18,198,567 18,077,506 18,184,441 Restricted shares subject to vesting 16,633 87,006 0 167,296 Performance related awards 0 23,943 0 23,943 Common stock option grants 0 1,256 0 5,976 Weighted shares outstanding - diluted 17,961,686 18,310,772 18,077,506 18,381,656 Net income per common share - diluted Net income (loss) $ 0.04 $ 0.06 $ (0.01 ) $ 0.08

Business Combinations

Business Combinations	9 Months Ended
	Sep. 30, 2021
Business Combinations [Abstract]
Business Combination	4. Business Combinations On April 30, 2021, the Company acquired all the outstanding stock of Smarteq Wireless Aktiebolag (“Smarteq”), a Swedish company based in Kista, Sweden, that designs antennas for specialized Industrial IoT and vehicular applications, pursuant to a Share Sale and Purchase Agreement (the “SPA”) between PCTEL and Allgon Aktiebolag, a Swedish company and holder of the outstanding stock of Smarteq. Smarteq owns all the outstanding stock of SAS Smarteq France (“Smarteq France”), which engages in sales of Smarteq products. Pursuant to the SPA, the Company acquired Smarteq for a cash purchase price consisting of SEK 53.0 million plus working capital adjustments of SEK 1.6 million and an adjustment for the net cash at closing of SEK 2.1 million for total cash consideration of SEK 56.8 million ($6.8 million), all of which was provided from PCTEL’s existing cash. The Company believes the acquisition of Smarteq will provide a strong local presence, expertise, and channel partners to accelerate revenue growth in Europe, as well as a complementary portfolio of products for our Industrial IoT and intelligent transportation customers worldwide. The results for Smarteq are combined with the Company’s antenna and Industrial IoT device product line. The Company applied the provisions of Accounting Standards Codification (ASC) 805, Business Combinations, in accounting for its acquisitions. It requires the Company to recognize separately from goodwill the assets acquired, and the liabilities assumed, at the acquisition date fair values. Goodwill as of the acquisition date is measured as the excess of consideration transferred over the acquisition date fair values of the net assets acquired and the liabilities assumed. While the Company uses its best estimates and assumptions where applicable to accurately value assets acquired and liabilities assumed at the acquisition date, its estimates are inherently uncertain and subject to refinement. The purchase price allocation is preliminary because the evaluations necessary to assess the fair values of the net assets acquired are still in process. Fair Value of Purchase Consideration: The following table summarizes the fair value of purchase consideration to acquire Smarteq: Fair value of purchase consideration Cash $ 6,785 Working capital adjustment (5 ) Total purchase consideration $ 6,780 Preliminary Purchase Price Allocation: The Company acquired all of the assets and liabilities of Smarteq, including cash of $0.5 million and debt of $0.1 million. The following is an allocation of the purchase price as of the April 30, 2021 closing date based upon a preliminary estimate of the fair value of the assets acquired and liabilities assumed by the Company in the acquisition: Preliminary Purchase Price Allocation: Cash $ 503 Accounts receivable 1,415 Prepaid expenses and other assets 109 Inventories 1,286 Right of use assets 232 Property and equipment 131 Intangible assets 1,983 Accounts payable (981 ) Accrued liabilities (837 ) Lease liabilities - short-term (102 ) Lease liabilities - long-term (112 ) Debt (91 ) Identifiable assets acquired $ 3,536 Goodwill 3,244 Total purchase price $ 6,780 The following is a summary of identifiable intangible assets acquired and the related expected lives for the finite-lived intangible assets: Finite-lived assets: Customer relationships $ 787 Trade names 639 Technology 438 Other intangible assets 119 $ 1,983 Intangible Assets: Useful Life Customer relationships 5 years Trade names 5 years Technology 5 years Other intangible assets .5 to 5 years Assumptions in the Allocations of Purchase Price The Company prepared the purchase price allocation and in doing so utilized reports of a third-party valuation expert to calculate the fair value of the identifiable intangible assets. Estimates of fair value require management to make significant estimates and assumptions which are preliminary and subject to change upon finalization of the valuation analysis. The goodwill recognized is attributable primarily to the acquired workforce, expected synergies, and other benefits that the Company believes will result from integrating the Smarteq operations with the operations of the Company. Updates to and/or completion of the valuations of certain assets acquired and liabilities assumed may result in changes to the recorded amounts of assets and liabilities, with corresponding adjustments to goodwill amounts in subsequent periods. The Company expects to complete the purchase price allocation within 12 months of the respective acquisition date. The areas that are not yet finalized relate to intangible assets, goodwill and inventory. The fair value of the customer relationships was determined using the multi-period excess earnings method (“MPEEM”). MPEEM estimates the value of an intangible asset by quantifying the amount of residual (or excess) cash flows generated by the future customer cash flows, and discounting those cash flows to the present value. Future cash flows for customers were estimated based on forecasted revenue and costs, taking into account the growth rates, customer attrition, and contributory charges. The fair value of the customer backlog was calculated using the present value of the cash flows associated with the acquired backlog. The fair values of the trade names, developed technology, and exclusive rights were determined using the relief-from-royalty method. The relief-from-royalty method is a specific application of the discounted-cash-flow method, which is a form of the income approach. It is based on the principle that ownership of the intangible asset relieves the owner of the need to pay a royalty to another party in exchange for rights to use the asset. Key assumptions to estimate the hypothetical royalty rate include observable royalty rates, which are royalty rates in negotiated licenses and market-based royalty rates which are royalty rates found in available market data for licenses involving similar assets. The fair value of covenants to non-compete was estimated using the with-or-without method. The with-and-without method estimates the value of an intangible asset by quantifying the loss of economic profits under a hypothetical condition where only the subject intangible does not exist and needs to be re-created. Projected revenues, operating expenses and cash flows are calculated in each "with" and "without" scenario and the difference in the cash flow is discounted to present value. Inventory was valued at net realizable value. Raw materials were valued at book value and finished goods were valued assuming hypothetical revenues from finished goods adjusted for disposal costs, profit attributable to the seller and holding costs. An inventory step-up to fair value of $0.5 million was included in the purchase price allocation above. The inventory step-up was calculated based on the net realizable value, on a part-by-part basis, of the inventory on the opening balance sheet. The amortization expense was recorded based on the consumption of those parts. The Company assumed gross accounts receivable of $1.4 million. Based on Smarteq’s bad debt experience and a review of the receivables, the Company does not anticipate an issue with collectability. The Company assumed liabilities in the acquisition which primarily consist of accounts payable, accrued employee compensation and certain operating liabilities. The fair value of the liabilities assumed are valued at their cash settlement value. As part of the acquisition of Smarteq on April 30, 2021, the Company assumed an office lease. The office in Kista, Sweden has 4,080 square feet used for engineering, sales, and administration and the lease term is through July 31, 2023. On the acquisition date, the Company recorded $0.2 million for each of the right-of-use assets and the lease liabilities. The Company assumed Smarteq France’s five-year May 2026 The Company recorded net deferred tax assets of $2.4 million, primarily relating to deferred tax assets for net operating losses. The Company also booked a deferred tax asset for inventory reserves and deferred tax liabilities related to intangible asset amortization that is not deductible for income taxes. The Company booked a full valuation allowance against the net deferred tax assets. While the Company expects book and tax profits in 2021 and future periods, Smarteq has recorded a three-year cumulative tax loss. Based on this objective evidence and uncertainty associated with the COVID-19 pandemic, the Company recorded a full valuation allowance on the opening balance sheet. Goodwill recorded in connection with the acquisition was $3.2 million. The Company does not expect to deduct any of the acquired goodwill for tax purposes. The Company recorded $0.3 million of transaction costs for the three months ended June 30, 2021 in general and administrative expenses in the statement of operations. The transaction costs will not be deductible for income tax purposes. Supplemental pro forma financial information The following unaudited pro forma financial information presents the combined results of operations for each of the periods presented as if the Smarteq acquisition had occurred as of January 1, 2020: Three Months Ended September 30, Nine Months Ended September 30, 2021 2020 2021 2020 Net Revenue - pro forma combined $ 22,411 $ 23,503 $ 64,517 $ 62,420 Net Income - pro forma combined 797 620 493 314 Weighted Average Shares: Basic 17,945 18,199 18,078 18,184 Diluted 17,962 18,311 18,078 18,382 Net Income per Share: Basic $ 0.04 $ 0.03 $ 0.03 $ 0.02 Diluted $ 0.04 $ 0.03 $ 0.03 $ 0.02 The following adjustments were included in the unaudited pro forma combined net revenues: Three Months Ended September 30, Nine Months Ended September 30, 2021 2020 2021 2020 Net Revenue $ 22,411 $ 18,923 $ 61,799 $ 56,271 Add: Net Revenue - acquired business 0 4,580 2,718 6,149 Net Revenue - pro forma combined $ 22,411 $ 23,503 $ 64,517 $ 62,420 The following adjustments were included in the unaudited pro forma combined net income (loss): Three Months Ended September 30, Nine Months Ended September 30, 2021 2020 2021 2020 Net Income (Loss) $ 664 $ 1,042 $ (167 ) $ 1,546 Add: Results of operations of acquired business 0 $ (94 ) 183 (26 ) Less: pro forma adjustments Amortization of intangibles 3 (99 ) (226 ) (296 ) Inventory fair value adjustments 133 (222 ) 416 (444 ) Acquisition related expenses 0 0 304 (425 ) Interest expense (3 ) (7 ) (17 ) (41 ) Net Income - pro forma combined $ 797 $ 620 $ 493 $ 314 The unaudited pro forma financial information has been adjusted to reflect the amortization expense for acquired intangibles, removal of historical intangible asset amortization and recognition of expense associated with the step-up of inventory. The pro forma data is presented for illustrative purposes only, and the historical results of Smarteq are based on its books and records prior to the acquisition and is not necessarily indicative of the consolidated results of operations of the combined business had the acquisition actually occurred as of January 1, 2020. In addition, future results may vary significantly from the pro forma results reflected herein and should not be relied upon as an indication of the results of future operations of the combined business. The unaudited pro forma financial information does not reflect any operating efficiencies and cost savings that may be realized from the integration of the acquired entity. For the three months ended September 30, 2021, $2.3 million of revenue and net income of $0.1 million was included in the Company's condensed consolidated statements of operations related to Smarteq. For the nine months ended September 30, 2021, $3.9 million of revenue and a net loss of $0.1 million was included in the Company's condensed consolidated statements of operations related to Smarteq.

Cash, Cash Equivalents and Inve

Cash, Cash Equivalents and Investments	9 Months Ended
	Sep. 30, 2021
Cash And Cash Equivalents [Abstract]
Cash, Cash Equivalents and Investments	5. Cash, Cash Equivalents and Investments The Company’s cash, cash equivalents, and investments consisted of the following: September 30, December 31, 2021 2020 Cash $ 8,342 $ 4,740 Cash equivalents 1,430 1,021 Short-term investments 22,680 30,582 Long-term investments 0 4,640 Total $ 32,452 $ 40,983 Cash and Cash Equivalents At September 30, 2021 and December 31, 2020, cash and cash equivalents included bank balances and investments with original maturities of less than 90 days The Company had cash in foreign bank accounts of $3.6 million at September 30, 2021 and $2.9 million at December 31, 2020. The Company had $2.6 million and $2.9 million of cash and cash equivalents in bank accounts in China at September 30, 2021 and December 31, 2020, respectively. In addition, the Company had $0.9 million of cash in bank accounts in Sweden and $0.1 million of cash in bank accounts in France at September 30, 2021. The Company’s cash in its foreign bank accounts is not insured. At September 30, 2021, $1.1 million of the cash and cash equivalents in China was invested in a 90-day deposit account classified as cash equivalents and $1.5 million was in cash accounts. As of September 30, 2021, the Company has no intention of repatriating the cash in its foreign bank accounts. If the Company decides to repatriate the cash in the foreign bank accounts, it may have trouble doing so in a timely manner. The Company may also be exposed to foreign currency fluctuations and taxes if it repatriates these funds. Investments At September 30, 2021 and December 31, 2020, the Company’s investments consisted of corporate bonds with ratings at the purchase date of A or higher and certificates of deposit. All the investments at September 30, 2021 and December 31, 2020 were classified as held-to-maturity. The bonds and certificates of deposit classified as short-term investments have original maturities greater than 90 days and mature within one year and the bonds and certificates of deposit classified as long-term investments have maturities greater than one year but less than two years. The Company’s bond investments are recorded at the purchase price and carried at amortized cost. Effective January 1, 2020, the Company adopted ASU 2016-13. This ASU replaces the incurred loss impairment model with an expected loss impairment model for financial instruments, including short-term investments. The amendment requires entities to consider forward-looking information to estimate expected credit losses. Under ASU 2016-13, the Company classifies its held-to-maturity investment portfolio by the investment type and further classifies the corporate bonds by the bond ratings. For estimating potential credit losses, the Company considers the historical loss data, the bond ratings, as well as and current and future economic conditions. Cash equivalents and investments were as follows at September 30 September 30, 2021 December 31, 2020 Level 1 Level 2 Total Level 1 Level 2 Total Cash equivalents: Certificates of deposit $ 0 $ 0 $ 0 $ 300 $ 0 $ 300 Money market funds 1,430 0 1,430 721 0 721 Total Cash Equivalents $ 1,430 $ 0 $ 1,430 $ 1,021 $ 0 $ 1,021 Short-Term Investments: Corporate bonds $ 0 $ 21,274 $ 21,274 $ 0 $ 26,318 $ 26,318 Certificates of deposit 1,406 0 1,406 4,264 0 4,264 Total Short-Term Investments $ 1,406 $ 21,274 $ 22,680 $ 4,264 $ 26,318 $ 30,582 Long-Term Investments: Corporate bonds $ 0 $ 0 $ 0 $ 0 $ 4,382 $ 4,382 Certificates of deposit 0 0 0 258 0 258 Total Long-Term Investments $ 0 $ 0 $ 0 $ 258 $ 4,382 $ 4,640 Cash equivalents and Investments - book value $ 2,836 $ 21,274 $ 24,110 $ 5,543 $ 30,700 $ 36,243 Unrealized gains (losses) $ 0 $ 4 $ 4 $ (1 ) $ (7 ) $ (8 ) Cash equivalents and Investments - fair value $ 2,836 $ 21,278 $ 24,114 $ 5,542 $ 30,693 $ 36,235 The Company categorizes its financial instruments within a fair value hierarchy according to accounting guidance for fair value. The fair value hierarchy is described under the Fair Value of Financial Instruments in Note 2. For the Level 2 investments, the Company uses quoted prices of similar assets in active markets. The fair values in the table above reflect net unrealizable gains of $4 at September 30, 2021, and net unrealized losses of $8 at December 31, 2020.

Goodwill and Intangible Assets

Goodwill and Intangible Assets	9 Months Ended
	Sep. 30, 2021
Goodwill And Intangible Assets Disclosure [Abstract]
Goodwill and Intangible Assets	6. Goodwill and Intangible Assets Goodwill The change in the carrying amount of goodwill during the nine months ended September 30, 2021 is as follows: Amount Balance at December 31, 2020 $ 3,332 Acquisition of Smarteq 3,244 Foreign currency translation (147 ) Balance at September 30, 2021 $ 6,429 The Company performs an annual impairment test of goodwill as of the end of the first month of the fourth fiscal quarter (October 31), or at an interim date if an event occurs or if circumstances change that would indicate that an impairment loss may have been incurred. In performing the annual impairment test, the Company may consider qualitative factors that would indicate possible impairment. A quantitative fair value assessment is also performed at the reporting unit level. If the fair value exceeds the carrying value, then goodwill is not impaired, and no further testing is performed. If the carrying value exceeds the fair value, the implied fair value of goodwill is then compared against the carrying value of goodwill to determine the amount of impairment. In addition to the annual impairment test, the Company is required to regularly assess whether a triggering event has occurred which would require interim impairment testing. The Company considered the current and expected future economic and market conditions surrounding the COVID-19 pandemic and its impact on each of the reporting units. Further, the Company assessed the current market capitalization and financial forecasts. There were no triggering events during the nine months ended September 30, 2021 and September 30, 2020. The Company will continue to monitor goodwill for impairment going forward. Intangible Assets The Company amortized intangible assets with finite lives on a straight-line basis over the estimated useful lives, which ranged from one to five years. The summary of amortization expense in the condensed consolidated statement of operations is as follows: Three Months Ended September 30, Nine Months Ended September 30, 2021 2020 2021 2020 Cost of revenues $ 21 $ 0 $ 36 $ 111 Operating expenses 80 0 135 33 Total $ 101 $ 0 $ 171 $ 144 The summary of other intangible assets, net are as follows: September 30, 2021 December 31, 2020 Accumulated Net Book Accumulated Net Book Cost Amortization Value Cost Amortization Value Customer contracts and relationships $ 17,632 $ 16,943 $ 689 $ 16,880 $ 16,880 $ 0 Patents and technology 10,062 9,678 384 9,644 9,644 0 Trademarks and trade names 1,581 1,023 558 972 972 0 Other intangible assets 114 18 96 0 0 0 Total $ 29,389 $ 27,662 $ 1,727 $ 27,496 $ 27,496 $ 0 In April 2021, the Company recorded $2.0 million of finite-lived intangible assets for the acquisition of Smarteq, and during the nine months ended September 30, 2021, the Company recorded amortization expense of $0.2 million and foreign currency translation adjustment of $0.1 million. The assigned lives and weighted average amortization periods by intangible asset category are summarized below: Intangible Assets Assigned Life Weighted Average Amortization Period Customer contracts and relationships 5 years 5.0 Patents and technology 5 years 5.0 Trademarks and trade names 5 years 5.0 Other .5 to 5 years 3.6 Prior to the acquisition of Smarteq, the Company’s intangible assets were fully amortized as of February 2020. The future amortization expenses are as follows: Fiscal Year Amount 2021 (remaining three months) $ 98 2022 $ 386 2023 $ 386 2024 $ 372 2025 $ 364 Thereafter $ 121 Total $ 1,727

Balance Sheet Information

Balance Sheet Information	9 Months Ended
	Sep. 30, 2021
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Balance Sheet Information	7. Balance Sheet Information Accounts Receivable Accounts receivable are recorded at invoiced amounts with standard net terms that range between 30 and 90 days. The Company extends credit to its customers based on an evaluation of a customer’s financial condition and collateral is generally not required. The Company records reserves for credit losses and credit allowances that reduce the value of accounts receivable to fair value. The allowances for accounts receivable consisted of the following: September 30, 2021 December 31, 2020 Credit loss provision $ 27 $ 66 Credit allowances 35 47 Total allowances $ 62 $ 113 Effective January 1, 2020, the Company adopted ASU 2016-13. This ASU replaces the incurred loss impairment model with an expected loss impairment model for financial instruments, including accounts receivable. The amendment requires entities to consider forward-looking information to estimate expected credit losses. The Company did not record an adjustment upon adoption of ASU 2016-13. The Company is exposed to credit losses primarily through the sale of products. The Company’s expected loss methodology for accounts receivable is developed using historical collection experience, current and future economic market conditions, and a review of the current status of customers’ trade accounts receivable. Due to the short-term nature of accounts receivable, the estimate of amount of accounts receivable that may not be collected is based on aging of the account receivable balances and the financial condition of customers. Additionally, specific allowance amounts are established to record the appropriate provision for customers that have a higher probability of default. The Company’s monitoring activities include timely account reconciliation, dispute resolution, payment confirmation, consideration of customers' financial condition and macroeconomic conditions. Balances are written off when determined to be uncollectible. The Company’s allowance for credit losses was $0.03 million at September 30, 2021 and $0.07 million at December 31, 2020. The following table summarizes the allowance for credit losses activity during the nine months ended September 30, 2021: Balance at December 31, 2020 $ 66 Current period benefit for credit losses (39 ) Balance at September 30, 2021 $ 27 Inventories Inventories are stated at the lower of cost or net realizable value and include material, labor and overhead costs using the first-in, first-out method of costing. Inventories as of September 30, 2021 and December 31, 2020 were composed of raw materials, work-in-process and finished goods. The Company had consigned inventory with customers of $0.5 million and $0.3 million at September 30, 2021 and December 31, 2020, respectively. The Company records allowances to reduce the value of inventory to the lower of cost or net realizable value, including allowances for excess and obsolete inventory. Reserves for excess inventory are calculated based on an estimate of inventory in excess of normal and planned usage. Obsolete reserves are based on the identification of inventory where the carrying value is above net realizable value. The allowance for inventory losses was $4.0 million at September 30, 2021 and $3.7 million at December 31, 2020. Inventories, net consisted of the following: September 30, 2021 December 31, 2020 Raw materials $ 5,838 $ 5,315 Work-in-process 852 883 Finished goods 6,293 3,786 Inventories, net $ 12,983 $ 9,984 Prepaid Expenses and Other Assets Prepaid assets are stated at cost and are amortized over the useful lives (up to one year) of the assets. Property and Equipment Property and equipment are stated at cost and are depreciated using the straight-line method over the estimated useful lives of the assets. The Company depreciates computer equipment and software licenses over three to five years, office equipment, manufacturing and test equipment, and motor vehicles over five years, furniture and fixtures over seven years, and buildings over 30 years. Leasehold improvements are amortized over the shorter of the corresponding lease term or useful life. Depreciation expense and gains and losses on the disposal of property and equipment are included in cost of sales and operating expenses in the condensed consolidated statements of operations. Maintenance and repairs are expensed as incurred. Property and equipment consisted of the following: September 30, 2021 December 31, 2020 Building $ 6,892 $ 6,868 Computers and office equipment 10,598 10,039 Manufacturing and test equipment 16,859 15,394 Furniture and fixtures 1,443 1,437 Leasehold improvements 3,007 2,973 Motor vehicles 20 20 Total property and equipment 38,819 36,731 Less: Accumulated depreciation and amortization (28,220 ) (25,996 ) Land 1,770 1,770 Property and equipment, net $ 12,369 $ 12,505 Depreciation and amortization expense were approximately $0.8 million for each of the three months ended September 30, 2021 and 2020. Depreciation and amortization expense were approximately $ 2.3 million for each of the nine months ended September 30, 2021 and 2020, respectively. Amortization for finance leases is included in depreciation and amortization expense. See Note 11 for information related to finance leases. Liabilities Accrued liabilities consisted of the following: September 30, 2021 December 31, 2020 Inventory receipts $ 4,292 $ 3,049 Paid time off 1,393 1,028 Payroll and other employee benefits 1,799 1,083 Professional fees and contractors 295 316 Employee stock purchase plan 446 224 Operating leases 456 269 Warranties 272 285 Deferred revenues 324 242 Real estate taxes 117 155 Income and sales taxes 276 185 Customer refunds for estimated returns 218 146 Finance leases 68 68 Restructuring 0 15 Other 313 251 Total $ 10,269 $ 7,316 Long-term liabilities consisted of the following: September 30, 2021 December 31, 2020 Operating leases $ 3,691 $ 3,949 Deferred payroll taxes 243 243 Finance leases 104 96 Deferred revenue 86 76 Other 114 23 Total $ 4,238 $ 4,387

Stock-Based Compensation

Stock-Based Compensation	9 Months Ended
	Sep. 30, 2021
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Stock-Based Compensation	8. Stock-Based Compensation The condensed consolidated statements of operations include $0.4 million of stock compensation expense for the three months ended September 30, 2021 and 2020, respectively. The condensed consolidated statements of operations include $2.0 million of stock compensation expense for the nine months ended September 30, 2021 and 2020, respectively. T The stock-based compensation expense by type is as follows: Three Months Ended September 30, Nine Months Ended September 30, 2021 2020 2021 2020 Service-based awards $ 341 $ 462 $ 1,435 $ 1,749 Performance-based awards (short-term incentive plan) (196 ) 0 0 0 Performance-based awards (long-term incentive plan) 160 (88 ) 394 67 Employee stock purchase plan 67 59 200 180 Total $ 372 $ 433 $ 2,029 $ 1,996 Total stock-based compensation is reflected in the condensed consolidated statements of operations as follows: Three Months Ended September 30, Nine Months Ended September 30, 2021 2020 2021 2020 Cost of revenues $ 51 $ 61 $ 185 $ 207 Research and development 102 121 384 403 Sales and marketing 73 115 458 429 General and administrative 146 136 1,002 957 Total $ 372 $ 433 $ 2,029 $ 1,996 The following table presents a summary of the remaining unrecognized share-based compensation expense related to outstanding share-based awards as of September 30, 2021: Award Type Remaining Unrecognized Compensation Expense Weighted Average Life (Years) Service-based awards $ 1,816 1.4 Performance-based awards $ 2,096 2.2 Service-Based Awards Restricted Stock The Company grants service-based stock awards to employees under its long-term incentive plan (“LTIP”). All stock awards to employees are issued under the PCTEL, Inc. 2019 Stock Incentive Plan. For the annual awards granted to executives and key managers in the nine months ended September 30 , 2021 and 2020, respectively, the awards were comprised one-third of service-based restricted awards and two-thirds of performance-based awards. When service-based restricted stock is granted, the Company records deferred stock compensation within additional paid-in capital, representing the fair value of the common stock on the date the restricted shares are granted . The Company records stock compensation expense on a straight-line basis over the vesting period of the applicable service-based restricted shares . The following table summarizes service-based restricted stock activity for the nine months ended September 30, 2021: Shares Weighted Average Fair Value Unvested Restricted Stock Awards - December 31, 2020 432,422 $ 6.90 Shares awarded 170,158 8.04 Shares vested (270,607 ) 6.60 Shares cancelled (3,102 ) 7.76 Unvested Restricted Stock Awards - September 30, 2021 328,871 $ 7.75 In March 2021, the Company issued to employees 170,158 service-based restricted stock awards that vest in three substantially equal annual increments commencing in 2022. In February 2020, the Company issued to employees 153,694 service-based restricted stock awards under the LTIP that vest in three substantially equal annual increments commencing in 2021. In April 2020, the Company reduced the salary of each executive and key manager by 10% and in connection therewith issued shares of restricted stock with one-year The intrinsic value of service-based restricted shares that vested during the nine months ended September 30, 2021 and 2020 was $2.2 million and $1.9 million, respectively. Restricted Stock Units The Company grants service-based restricted stock units as employee incentives. Restricted stock units are primarily granted to foreign employees for long-term incentive purposes. Employee restricted stock units are service-based awards and are amortized over the vesting period. At the vesting date, these units are converted to shares of common stock. The Company records expense on a straight-line basis for restricted stock units. The following table summarizes the restricted stock unit activity during the nine months ended September 30, 2021: Shares Weighted Average Fair Value Unvested Restricted Stock Units - December 31, 2020 9,083 $ 7.02 Units awarded 17,800 7.11 Units vested/Shares awarded (5,446 ) 6.47 Unvested Restricted Stock Units - September 30, 2021 21,437 $ 7.23 The intrinsic value of service-based restricted stock units that vested and were issued as shares during the nine months ended September 30, 2021 and 2020 was $42 and $44, respectively. In March 2021, the Company issues 2,800 service-based restricted stock units to foreign employees. In June 2021, the Company issued 15,000 service-based restricted stock units to employees of the Swedish subsidiary, Smarteq, with a four-year Stock Options The Company may grant employees options to purchase the Company’s common stock. The Company issues stock options with exercise prices no less than the fair value of the Company’s stock on the grant date. Employee stock options are subject to installment vesting typically over a period of not less than three years. Stock options may be exercised at any time prior to their expiration date or within 180 days of termination of employment, or such shorter time as may be provided in the related stock option agreement. The stock options outstanding at September 30, 2021 have a seven-year The following tables summarizes the stock option activity for the nine months ended September 30, 2021: Options Outstanding Weighted Average Exercise Price Outstanding at December 31, 2020 16,250 $ 6.54 Options exercised (6,000 ) 5.48 Options cancelled/expired (6,250 ) 7.89 Outstanding at September 30, 2021 4,000 $ 6.02 Exercisable at September 30, 2021 3,790 $ 5.97 During the nine months ended September 30, 2021, the Company received proceeds of $8 and issued 1,420 shares for the exercise of 6,000 options. The intrinsic value of the options exercised was $53. During the nine months ended 30, 2020, the Company received proceeds of $0.1 million from the exercise of options for 9,412 shares and issued 10,194 shares for the exercise of 52,355 options. The intrinsic value of the options exercised was $0.1 million. The following table summarizes information about stock options outstanding under all stock option plans: Options Outstanding Options Exercisable Range of Exercise Prices Number Outstanding Weighted Average Contractual Life (Years) Intrinsic Value Weighted- Average Exercise Price Number Exercisable Weighted Average Contractual Life (Years) Intrinsic Value Weighted Average Exercise Price $ 5.06 - $ 6.98 4,000 2.67 $ 2 $ 6.02 3,790 2.63 $ 2 $ 5.97 Weighted Average Contractual Life (years) Intrinsic Value Options Outstanding 2.67 $ 2 Options Exercisable 2.63 $ 2 The intrinsic value is based on the share price of $6.22 at September 30, 2021. For outstanding stock options, the Company calculated the fair value of each option grant on the date of grant using the Black-Scholes option-pricing model. Because the Company’s employee stock options have characteristics significantly different from those of traded options, and because changes in the subjective input assumptions can materially affect the fair value estimate, the existing models may not necessarily provide a reliable single measure of the fair value of the employee stock options. In addition, option valuation models require the input of highly subjective assumptions including the expected stock price volatility and expected option life. The dividend yield rate is calculated by dividing the Company’s annual dividend by the closing price on the grant date. The risk-free interest rate is based on the U.S. Treasury yields with a remaining term that approximates the expected life of the options granted. The expected volatility is based on a five-year Performance-Based Equity Awards Short-Term Incentive Plan Incentive compensation earned by executives and key managers under the Company’s 2021 Short-Term Incentive Plan (“STIP”) will be settled 50% in cash and 50% in shares of the Company’s stock as was the case with the 2020 STIP. Under both the 2021 STIP and 2020 STIP, payouts could be earned based on annual revenue and adjusted EBITDA targets. No shares were earned under the 2020 STIP because the Company did not exceed the revenue or EBITDA thresholds. Long-Term Incentive Plan The Company grants performance-based awards to executives and key managers to encourage sustainable growth, consistent earnings, and management retention . Based on the fair value of the shares on the grant date, the Company records stock compensation expense over the performance period based on the estimated achievement of the award. The following table summarizes the performance award activity: Awards at Target Weighted Average Fair Value Unvested Performance Awards - December 31, 2020 316,726 $ 6.84 Awards granted 187,864 8.15 Unvested Performance Awards - September 30, 2021 504,590 $ 7.33 The Company granted performance awards under its long-term incentive plan to executives and key managers in February 2021 (“2021 LTIP”). The performance period for the 2021 LTIP is from January 1, 2021 through December 31, 2023. At target, the total fair market value of the award was $1.5 million based on the average share price of $8.15 on the grant date. On the award date, the aggregate number of shares that could be earned at target was 187,864 and the maximum number of aggregate shares that could be earned was 328,762. Under the 2021 LTIP and similar plans from 2019 and 2020, shares of the Company’s stock can be earned based on achievement of a three-year revenue growth target with a penalty if a certain adjusted EBITDA level is not maintained. If the Company achieves less than the target growth over the performance period, the participant will receive fewer shares than the target award, determined on a straight-line basis. If the Company achieves greater than the target growth, the participant will receive more shares than the target award on an accelerated basis. Participants are required to be in service at the determination date of the award following the end of the performance period in order to receive the award. Shares earned will be fully vested shares. The Company records stock compensation expense over the performance period based on the Company’s estimate of the aggregate number of shares that will be earned under the incentive plan. The following table summarizes the active performance-based long-term incentive plans at September 30, 2021: Number of Shares Share Price That Could Be Earned: LTIP award on Grant Date Target Maximum Performance Period 2019 LTIP $ 5.27 171,437 295,325 January 1, 2019 through December 31, 2021 2020 LTIP $ 8.70 145,289 254,256 January 1, 2020 through December 31, 2022 2021 LTIP $ 8.15 187,864 328,762 January 1, 2021 through December 31, 2023 504,590 878,343 Employee Stock Purchase Plan (“ESPP”) The ESPP enables eligible employees to purchase common stock at the lower of 85% of the fair market value of the common stock on the first or last day of each offering period. Each offering period is approximately six months. Based on the 15% discount and the fair value of the option feature of the ESPP, it is considered compensatory. Compensation expense is calculated using the fair value of the employees’ purchase rights under the Black-Scholes model. The Company calculated the fair value of each employee stock purchase grant on the date of grant using the Black-Scholes option-pricing model using the following assumptions: Employee Stock Purchase Plan 2021 2020 Dividend yield 3.1 % 4.1 % Risk-free interest rate 0.1 % 0.1 % Expected volatility 48 % 44 % Expected life (in years) 0.5 0.5 The dividend yield rate was calculated by dividing the Company’s annual dividend by the closing price on the grant date. The risk-free interest rate was based on the U.S. Treasury yields with a remaining term that approximates the expected life of the options granted . The volatility was based on a five-year historical period of the Company’s stock price . The expected life was based on the offering period. Board of Director Equity Awards The Company grants equity awards to members of its Board of Directors as an annual retainer and for committee service. These awards are shares of the Company’s common stock that vest upon issuance or, in some cases, one year after issuance. In addition, new directors receive a one-time grant that vests over three years. In May 2021, the Company issued 61,186 shares, in the aggregate, to directors for their annual retainer and committee services, of which 49,652 shares vested immediately upon issuance, with the remainder vesting one year after issuance. The fair value of the service based restricted shares for directors that vested during the nine months ended September 30, 2021 was $0.3 million. The following table summarizes the director awards activity: Shares Weighted Average Fair Value Outstanding - December 31, 2020 2,416 $ 6.90 Shares awarded 61,186 6.57 Shares vested (52,068 ) 6.65 Outstanding - September 30, 2021 11,534 $ 6.57 Employee Withholding Taxes on Stock Awards For ease in administering the issuance of stock awards, the Company holds back shares of vested restricted stock awards, stock option exercises and short-term and long-term incentive plan stock awards for the value of the statutory withholding taxes. For everyone receiving a share award, the Company redeems the shares it computes as the value for the withholding tax and remits this amount to the appropriate tax authority. For withholding taxes related to stock awards, the Company paid $0.8 million and $1.1 million during the nine months ended September 30, 2021 and 2020, respectively. Stock Repurchases On November 6, 2019, the Board of Directors approved a share repurchase program (“2019 Repurchase Plan”), which was reauthorized on March 10, 2020. Under the 2019 Repurchase Plan, the Company was authorized to repurchase up to $7.0 million of its common stock through the end of 2020. The Company spent $2.0 million to repurchase 375,046 shares at an average price of $5.36 during the three months ended March 31, 2020. Due to uncertainties related to the COVID-19 pandemic and to protect the Company’s cash position, on April 1, 2020, the Board of Directors approved the termination of the 2019 Repurchase Plan. On November 4, 2020, the Board of Directors approved a $5.0 million share repurchase program (“2020 Repurchase Plan”). The Company spent $1.8 million to repurchase 288,573 shares at an average price of $6.30 during the three months ended December 31, 2020 and the Company spent $3.2 million during the nine months ended September 30, 2021 to repurchase 495,144 shares at an average price of $6.45. The Company retired all repurchased shares. The 2020 Repurchase Plan ended in September 2021 with the completion of $5.0 million of share repurchases. Authorized Shares On May 29, 2020, the Company filed a Certificate of Amendment to its Amended and Restated Certificate of Incorporation (i) changing the Company’s name from “PC-Tel, Inc.” to “PCTEL, Inc.” and (ii) decreasing the number of authorized shares of common stock from 100,000,000 shares to 50,000,000 shares.

Benefit Plans

Benefit Plans	9 Months Ended
	Sep. 30, 2021
Compensation And Retirement Disclosure [Abstract]
Benefit Plans	9. Benefit Plans Employee Benefit Plans The Company’s 401(k) plan covers all U.S. employees beginning the first day of the month following the first month of their employment. Under this plan, employees may elect to contribute up to 15% of their current compensation to the 401(k) plan up to the statutorily prescribed annual limit. The Company matches employee contributions up to 4% and may also make discretionary contributions to the 401(k) plan. The Company also contributes to various retirement plans for foreign employees. The Company’s contributions to retirement plans during the three and nine months ended September 30, 2021 and 2020, respectively, were as follows: Three Months Ended September 30, Nine Months Ended September 30, 2021 2020 2021 2020 PCTEL, Inc. 401(k) profit sharing plan - U.S. employees $ 184 $ 164 $ 540 $ 560 Defined contribution plans - foreign employees 115 9 322 41 Total $ 299 $ 173 $ 862 $ 601 Contributions for foreign employees was higher for the three and nine months ended September 30, 2021 because of the addition of Smarteq employer required contributions and because employer contributions to Chinese government sponsored retirement programs were not required from February 2020 through December 2020.

Commitments and Contingencies

Commitments and Contingencies	9 Months Ended
	Sep. 30, 2021
Commitments And Contingencies Disclosure [Abstract]
Commitments and Contingencies	10. Commitments and Contingencies China Restructuring On August 7, 2019, the Company’s Board of Directors approved a transition plan for the Company’s China manufacturing operations. As part of the plan, the Company is transitioning high-volume manufacturing from its Tianjin, China facility to contract manufacturers in China and elsewhere in order to reduce fixed costs in China, optimize the cost structure of the antenna product line, create flexibility in antenna manufacturing, and address the uncertainty of the lease of the current manufacturing premises, as described below. For the year ended December 31, 2020, the Company incurred restructuring expenses of $0.1 million for employee severance related to the separation of 12 employees and for the year ended December 31, 2019, the Company incurred restructuring expenses of $0.5 million for employee severance and related benefits related to the separation of 84 employees. Severance costs were paid from the Company’s cash in its China bank accounts. On October 8, 2020, the lease of the premises on which the Company’s China manufacturing operations are conducted expired and the renewal is pending and uncertain. The Company has been notified that the Chinese Party Central Committee and the State Council are accelerating the layout optimization and transformation of the industrial park in which the Company’s leased premises is located and, accordingly, leases and lease extensions for all premises in the industrial park have been suspended and rent collection has been postponed. However, rent maybe due for the period of the lease suspension. As a result of the uncertainty regarding the Tianjin Lease (as defined in Note 11) renewal, the Company refined its transition plan for the manufacturing activities conducted on the leased premises. As part of the refined transition plan, the Company will complete the manufacturing transition by the end of December 2021, reduce headcount, and incur additional restructuring charges. The Company will retain a small group of employees in Tianjin, China, and move into a new leased facility during the first quarter 2022. The following table summarizes the restructuring activity during the nine months ended September 30, 2021 and the status of the reserves at September 30 Lease Severance Termination Total Balance at December 31, 2020 $ 0 $ 15 $ 15 Restructuring expense 59 0 59 Payments made (59 ) (15 ) (74 ) Balance at September 30, 2021 $ 0 $ 0 $ 0 The restructuring liability was recorded in accrued liabilities on the condensed consolidated balance sheet at December 31, 2020. Warranty Reserve and Sales Returns The Company allows its major distributors and certain other customers to return unused product under specified terms and conditions. The Company accrues for product returns based on historical sales and return trends. The refund liability related to estimated sales returns was $0.2 million and $0.1 million at September 30, 2021 and December 31, 2020, respectively, and is included within accrued liabilities on the accompanying condensed consolidated balance sheets. The Company offers repair and replacement warranties of up to five years for certain antenna products and test & measurement products. The Company’s warranty reserve is based on historical sales and costs of repair and replacement trends. The warranty reserve was $ 0.3 million at September 30 , 202 1 and 20 20 , respectively, and is included in accrued liabilities in the accompanying condensed consolidated balance sheets. The following table summarizes the warranty activity during the nine months ended September 30, 2021 and 2020: Nine Months Ended September 30, 2021 2020 Beginning balance $ 285 $ 444 Provisions for warranties 64 9 Consumption of reserves (77 ) (203 ) Ending balance $ 272 $ 250

Leases

Leases	9 Months Ended
	Sep. 30, 2021
Leases [Abstract]
Leases	11. Leases The Company has operating leases for facilities and finance leases for office equipment. Leases with an initial term of 12 months or less are not recorded in the balance sheet. The Company determines if an arrangement is a lease at inception of a contract. Right of Use (“ROU”) assets represent the Company's right to use an underlying asset during the lease term and lease liabilities represent the Company's obligation to make lease payments arising from the lease. ROU assets and lease liabilities are recognized at the lease commencement date based on the net present value of fixed lease payments over the lease term. The Company's lease term is deemed to include options to extend or terminate the lease when it is reasonably certain that it will exercise that option. ROU assets also include any advance lease payments made and exclude lease incentives. As most of the Company's operating leases do not provide an implicit rate, the Company uses its incremental borrowing rate based on the information available at commencement date in determining the present value of lease payments on a collateralized basis. Finance lease agreements generally include an interest rate that is used to determine the present value of future lease payments. Operating fixed lease expense and finance lease depreciation expense are recognized on a straight-line basis over the lease term. The Company's lease cost for the three and nine months ended September 30, 2021 and 2020, respectively, included the following components: Three Months Ended September 30, Nine Months Ended September 30, 2021 2020 2021 2020 Operating lease costs $ 121 $ 128 $ 333 $ 538 Short-term lease costs 41 50 123 77 Variable lease costs 5 0 9 2 Amortization of finance lease assets 18 18 53 59 Interest on finance lease liabilities 2 2 6 6 Total lease cost $ 187 $ 198 $ 524 $ 682 The table below summarizes the Company's scheduled future minimum lease payments under operating and finance leases recorded on the balance sheet as of September 30, 2021: Year Operating Leases Finance Leases 2021 (remaining three months) $ 124 $ 21 2022 655 66 2023 610 44 2024 581 33 2025 501 15 Thereafter 2,674 5 Total minimum payments required 5,145 184 Less: amount representing interest 998 12 Present value of net minimum lease payments 4,147 172 Less: current maturities of lease obligations (456 ) (68 ) Long-term lease obligations $ 3,691 $ 104 The weighted average remaining lease terms and discount rates for all the Company’s operating and finance leases were as follows as of September 30, 2021: September 30, 2021 Weighted-average remaining lease term - finance leases 3.1 years Weighted-average remaining lease term - operating leases 8.7 years Weighted-average discount rate - finance leases 3.9% Weighted-average discount rate - operating leases 5.0% The table below presents supplemental cash flow information related to leases during the three and nine months ended September 30, 2021 and 2020, respectively: Three Months Ended September 30, Nine Months Ended September 30, 2021 2020 2021 2020 Cash paid for (received) amounts included in the measurement of lease liabilities: Operating cash flows for operating leases $ 160 $ 33 $ 413 $ 262 Operating cash flows from tenant improvement incentives from operating leases $ 0 $ 0 $ 0 $ (1,004 ) Operating cash flows for finance leases $ 2 $ 2 $ 6 $ 6 Financing cash flows for finance leases $ 25 $ 18 $ 54 $ 59 The following table summarizes the classification of ROU assets and lease liabilities as of September 30, 2021 and December 31, 2020: Leases Consolidated Balance Sheet Classification September 30, 2021 December 31, 2020 Assets: Operating right-of-use assets Other noncurrent assets $ 2,307 $ 2,272 Finance right-of-use assets Other noncurrent assets 167 157 Total leased assets $ 2,474 $ 2,429 Liabilities: Current Operating lease liabilities Accrued liabilities $ 456 $ 269 Finance lease liabilities Accrued liabilities 68 68 Noncurrent Operating lease liabilities Long-term liabilities 3,691 3,949 Finance lease liabilities Long-term liabilities 104 96 Total lease liabilities $ 4,319 $ 4,382 On March 5, 2020, PCTEL (Tianjin) Wireless Telecommunications Products, Co. Ltd., a wholly owned subsidiary of the Company (“PCTEL Tianjin”), entered into a letter agreement with Wang Zhuang Village Committee of Tianjin, China (the “Letter Agreement”), specifying the terms for extension of the lease of the premises on which PCTEL Tianjin currently conducts its manufacturing activities in Tianjin, China (the “Tianjin Lease”) to October 2022. The Letter Agreement did not, however, effect the lease extension. The Tianjin Lease expired on October 8, 2020 without extension. On October 16, 2020, the Wang Zhuang Village Committee issued a notice informing PCTEL Tianjin that the Chinese Party Central Committee and the State Council are accelerating the layout optimization and transformation of the industrial park in which the leased premises is located, and accordingly leases and lease extensions for all premises in the industrial park have been suspended and rent collection has been postponed. The letter indicates that if the Tianjin Lease extension is subsequently approved, the rent for the period from October 9, 2020 to the date of the Tianjin Lease extension (the “Intervening Period”) will then be due and payable. Based upon past practices and verbal assurances, the Company believes that PCTEL Tianjin will have at least 30 days to vacate the leased premises if required by the Wang Zhuang Village Committee to do so. Under the Company’s transition plan, it expects to finish manufacturing in Tianjin by the end of December 2021 and will vacate the facility in the first half of 2022. The Company will retain a small group of employees in Tianjin, China, and move into a new leased facility during the first quarter 2022. As part of the acquisition of Smarteq on April 30, 2021, the Company assumed an office lease and an automotive lease. The office in Kista, Sweden has 4,080 square feet used for engineering, sales, and administration with a lease term ending July 31, 2023. On the acquisition date, the Company recorded $0.2 million for each of the ROU assets and the lease liabilities.

Borrowings

Borrowings	9 Months Ended
	Sep. 30, 2021
Subordinated Borrowings [Abstract]
Borrowings	12. Borrowings As part of the Smarteq acquisition, the Company assumed a five-year May 2026

Income Taxes

Income Taxes	9 Months Ended
	Sep. 30, 2021
Income Tax Disclosure [Abstract]
Income Taxes	13. Income Taxes The Company recorded income tax expense of $17 and $25 for the nine months ended September 30, 2021 and 2020, respectively. The expense recorded for the nine months ended September 30, 2021 and 2020 was lower than the statutory rate of 21% because the Company has a full valuation allowance on its deferred tax assets. The Company’s valuation allowance is due to the uncertainty regarding the utilization of the deferred tax assets. The Company had deferred tax assets net of deferred tax liabilities of $15.3 million at September 30, 2021 and $12.9 million at December 31, 2020. The deferred tax assets consisted of domestic deferred tax assets of $12.2 million, China deferred tax assets of $0.8 million, and Swedish deferred tax assets of $2.3 million. The Company’s gross deferred tax assets consist of federal and state net operating losses (“NOLs”), credits, and timing differences. As part of the acquisition of Smarteq, the Company recorded deferred tax assets of $2.3 million associated with NOLs, inventory reserves and recorded tax liabilities associated with acquired intangible assets. Because of the objective evidence of cumulative three-year losses and uncertainty associated with the COVID-19 pandemic, the Company recorded a full valuation allowance on the deferred tax assets. The Company’s federal NOLs generated in 2018 and future periods will not expire, and the Company’s NOLs and credits generated as of December 31, 2017 have a finite life primarily based on the 20-year carry forward of federal net operating losses. The timing differences have a ratable reversal pattern over 12 years. On a regular basis, the Company evaluates the recoverability of deferred tax assets and the need for a valuation allowance. Such evaluations involve the application of significant judgment. The Company considers multiple factors in its evaluation of the need for a valuation allowance. The analysis that the Company prepared to determine the valuation allowance required significant judgment and assumptions regarding future market conditions as well as forecasts for profits, taxable income, and taxable income by jurisdiction. Due to the sensitivity of the analysis, changes to the assumptions in subsequent periods could have a material effect on the valuation allowance. The Company files a consolidated federal income tax return, income tax returns with various states, and foreign income tax returns in various foreign jurisdictions. The Company’s U.S. federal tax returns remain subject to examination for 2017 and subsequent periods. The Company’s U.S. state tax returns remain subject to examination for 2015 and subsequent periods. The Company’s foreign tax returns remain subject to examination for 2011 and subsequent periods. The Company’s gross unrecognized tax benefit was $ 0.8 million at September 30 , 202 1 and December 31 , 20 20 . On March 27, 2020, the “Coronavirus Aid, Relief and Economic Security Act” (CARES Act) was signed into law. The CARES Act includes provisions relating to refundable payroll tax credits, deferment of the employer portion of certain payroll taxes, net operating loss carryback periods, alternative minimum tax credit refunds, modifications to the net interest deduction limitations and technical corrections to tax depreciation methods for qualified improvement property. Under the CARES Act, the Company is deferring the employer portion of social security taxes and will apply for a refund of its Alternative Minimum Tax credit. As of September 30, 2021, the Company had deferred $0.5 million of payroll taxes which will be paid in annual installments on December 31, 2021 and December 31, 2022. The amount to be paid on December 31, 2022 will not be deductible in 2021 for income tax purposes.

Product Line and Geographic Inf

Product Line and Geographic Information	9 Months Ended
	Sep. 30, 2021
Segment Reporting [Abstract]
Product Line and Geographic Information	14. Product Line and Geographic Information Product Line Information: The following tables are the product line revenues and gross profits for the three and nine months ended September 30, 2021 and 2020: Three Months Ended September 30, 2021 Antennas & Industrial IoT Devices Test & Measurement Products Corporate Total Revenues $ 16,686 $ 5,921 $ (196 ) $ 22,411 Gross Profit $ 5,655 $ 4,635 $ (36 ) $ 10,254 Gross Profit % 33.9 % 78.3 % NA 45.8 % Nine Months Ended September 30, 2021 Antennas & Industrial IoT Devices Test & Measurement Products Corporate Total Revenues $ 43,971 $ 18,540 $ (712 ) $ 61,799 Gross Profit $ 14,578 $ 14,057 $ (102 ) $ 28,533 Gross Profit % 33.2 % 75.8 % NA 46.2 % Three Months Ended September 30, 2020 Antennas & Industrial IoT Devices Test & Measurement Products Corporate Total Revenues $ 12,326 $ 6,810 $ (213 ) $ 18,923 Gross Profit $ 4,336 $ 5,203 $ 36 $ 9,575 Gross Profit % 35.2 % 76.4 % NA 50.6 % Nine Months Ended September 30, 2020 Antennas & Industrial IoT Devices Test & Measurement Products Corporate Total Revenues $ 37,696 $ 19,011 $ (436 ) $ 56,271 Gross Profit $ 13,228 $ 14,109 $ (26 ) $ 27,311 Gross Profit % 35.1 % 74.2 % NA 48.5 % Geographic Information: The Company’s revenue from customers by geographic location, as a percent of total revenues for the three and nine months ended September 30, 2021 and 2020, is as follows: Three Months Ended September 30, Nine Months Ended September 30, Region 2021 2020 2021 2020 Europe, Middle East & Africa 23% 16% 23% 16% Asia Pacific 9% 8% 8% 9% Other Americas 3% 3% 4% 2% Total Foreign sales 35% 27% 35% 27% Customer Concentration: During the three and nine months ended September 30, 2021 and 2020 no customer accounted for 10% or more of revenue. The following table represents the customers that accounted for 10% or more of total trade accounts receivable: Trade Accounts Receivable September 30, 2021 December 31, 2020 Customer B 12% 10% Customer C 3% 31%

Revenue from Contracts with Cus

Revenue from Contracts with Customers	9 Months Ended
	Sep. 30, 2021
Revenue From Contract With Customer [Abstract]
Revenue from Contracts with Customers	15. Revenue from Contracts with Customers Under Topic 606, a contract with a customer is an agreement which both parties have approved, that creates enforceable rights and obligations, has commercial substance, and specified payment terms, and for which collectability is probable. Once the Company has entered into a contract, it is evaluated to identify performance obligations. For each performance obligation, revenue is recognized as control of promised goods or services transfers to the customer in an amount that reflects the consideration the Company expects to receive in exchange for those goods or services. The amount of revenue recognized takes into account variable consideration, such as returns and volume rebates. A majority of the Company’s revenue is short cycle in nature with shipments within one year from order. The Company's payment terms generally range between 30 to 90 days. All of the Company’s revenue relates to contracts with customers. The Company’s accounting contracts are from purchase orders or purchase orders combined with purchase agreements. The majority of the Company’s revenue is recognized on a “point-in-time” basis and a nominal amount of revenue is recognized “over time.” For the sale of antennas and Industrial IoT products and test & measurement products, the Company satisfies its performance obligations generally at the time of shipment or upon delivery based on the contractual terms with its customers. For products shipped on consignment, the Company recognizes revenue upon delivery from the consignment location. For its test & measurement software tools, the Company has a performance obligation to provide software maintenance and support for one year. The Company recognizes revenues for the maintenance and support over this period. The Company considers shipping and handling performed by the Company as fulfillment activities. Amounts billed for shipping and handling are included in revenues, while costs incurred for shipping and handling are included in cost of revenues. The Company excludes taxes from the transaction price. Cost of contracts include sales commissions. The Company expenses the cost of contracts when incurred because the amortization period is one year or less. The Company allows its major distributors and certain other customers to return unused product under specified terms and conditions. The Company estimates product returns based on historical sales and return trends and records a corresponding refund liability. The refund liability was $0.2 million and $0.1 million at September 30, 2021 and December 31, 2020, respectively, and is included within accrued liabilities in the accompanying condensed consolidated balance sheets. The Company records an asset based on historical experience for the amount of product it expects to return to inventory as a result of customer returns, which is recorded in inventories in the accompanying condensed consolidated balance sheets. The product return asset was $0.1 million at September 30, 2021 and December 31, 2020. There were no contract assets at September 30, 2021 or December 31, 2020. The Company records contract liabilities for deferred revenue and customer prepayments. Contract liabilities are recorded in accrued liabilities in the accompanying condensed consolidated balance sheets. The contract liability was $0.5 million and $0.4 million at September 30, 2021 and December 31, 2020, respectively. The Company recognized revenue of $0.7 million and $0.6 million during the nine months ended September 30, 2021 and 2020, respectively, related to contract liabilities that existed at the beginning of the period.

Subsequent Events

Subsequent Events	9 Months Ended
	Sep. 30, 2021
Subsequent Events [Abstract]
Subsequent Events	16. Subsequent Events The Company evaluates subsequent events occurring between the most recent balance sheet date and the date that the financial statements are available to be issued in order to determine whether the subsequent events are to be recorded and/or disclosed in the Company’s financial statements and footnotes. The financial statements are considered to be available to be issued at the time that they are filed with the SEC. There were no subsequent events or transactions that required recognition or disclosure in the unaudited interim condensed consolidated financial statements.

Basis of Presentation (Policies

Basis of Presentation (Policies)	9 Months Ended
	Sep. 30, 2021
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Nature of Operations	Nature of Operations PCTEL, Inc. (PCTEL or the Company) was incorporated in California in 1994 and reincorporated in Delaware in 1998. The Company is a leading global provider of wireless technology, including purpose-built Industrial Internet of Things (“IoT”) devices, antenna systems, and test and measurement solutions. The Company has expertise in radio frequency (“RF”), digital and mechanical engineering. This expertise enables the Company to solve complex wireless challenges. The Company has two businesses (antennas & Industrial IoT devices and test & measurement products) that address three market segments: Enterprise Wireless, Intelligent Transportation, and Industrial IoT. The Company’s principal executive offices are located at 471 Brighton Drive, Bloomingdale, Illinois 60108. The telephone number at that address is (630) 372-6800 and the website is www.pctel.com. Additional information about the Company can be obtained on the Company’s website; however, the information within, or that can be accessed through, the Company’s website, is not part of this Quarterly Report on Form 10-Q.
Basis of Consolidation	Basis of Consolidation The unaudited interim condensed consolidated financial statements of the Company include the condensed consolidated balance sheets as of September 30, 2021 and December 31, 2020, the condensed consolidated statements of cash flows for the nine months ended September 30, 2021 and 2020, the condensed consolidated statements of operations, condensed consolidated statements of comprehensive income (loss), and the condensed consolidated statements of stockholders’ equity for the three and nine months ended September 30, 2021 and 2020, respectively. The interim condensed consolidated financial statements are unaudited and reflect all adjustments of a normal recurring nature that are, in the opinion of management, necessary for a fair presentation of the interim period financial statements. The condensed consolidated balance sheet as of December 31, 2020 is derived from the audited financial statements as of December 31, 2020. The unaudited interim condensed consolidated financial statements of the Company have been prepared pursuant to the rules and regulations of the Securities and Exchange Commission (“SEC”). Accordingly, certain information and footnote disclosures normally included in financial statements prepared in accordance with U.S. GAAP have been condensed or omitted. The significant accounting policies followed by the Company are set forth in the 2020 Form 10-K. There were no material changes in the Company’s significant accounting policies during the three and nine months ended September 30, 2021. In addition, the Company reaffirms the use of estimates in the preparation of the financial statements as set forth in the 2020 Form 10-K. These unaudited interim condensed consolidated financial statements should be read in conjunction with the Company’s audited consolidated financial statements and notes thereto included in the 2020 Form 10-K. The results of operations for the period ended September 30, 2021 may not be indicative of the results for the period ending December 31, 2021.
Foreign Operations	Foreign Operations Cross-border transactions, both with external parties and in our internal operations, result in exposure to foreign exchange rate fluctuations. We are exposed to currency risk with the Chinese Yuan due to our operations in China, and with other foreign currencies related to the acquisition of Smarteq (see Note 4) and related to suppliers and employees outside the U.S. Fluctuations could have an adverse effect on our results of operations and cash flows. We manage certain operating activities at the local level with revenues, costs, assets, and liabilities generally being denominated in local currencies. However, our results of operations and assets and liabilities are reported in U.S. dollars and thus will fluctuate with changes in exchange rates between such local currencies and the U.S. dollar . Gains and losses resulting from transactions originally in foreign currencies and then translated into U.S. dollars are included in the condensed consolidated statements of operations . For the nine months ended September 30 , 202 1 , approximately 9 % of revenues and 20 % of expenses were transacted in foreign currencies as compared to 3 % and % for the nine months ended September 3 0 , 20 20 . Net foreign exchange losses resulting from foreign currency transactions included in other income, net were $ ( 10 ) and $ ( 158 ) for the three months ended September 30, 2021 and 2020, respectively. Net foreign exchange gains (losses) resulting from foreign currency transactions included in other income, net was $ ( 54 ) and $ (139) for the nine months ended September 30 , 202 1 and 2020 , respectively.
Recent Accounting Pronouncements	Recent Accounting Pronouncements In January 2017, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”), Intangibles-Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment (ASU 2017-14). This guidance eliminates the requirement to calculate the implied fair value of goodwill to measure a goodwill impairment charge. Instead, entities will record an impairment charge based on the excess of a reporting unit’s carrying amount over its fair value. The changes are effective for smaller reporting companies for fiscal years beginning after December 15, 2022, including interim periods within those fiscal years, and early adoption is permitted. The Company is currently evaluating the impact that this guidance will have on its consolidated financial statements. In March 2020, the FASB issued ASU 2020-04, Reference Rate Reform (“Topic 848”): Facilitation of the Effects of Reference Rate Reform on Financial Reporting. This update provides optional expedients and exceptions for applying U.S. GAAP to certain contract modifications and hedging relationships that reference London Inter-bank Offered Rate (LIBOR) or another reference rate expected to be discontinued. Topic 848 is effective upon issuance and generally can be applied through December 31, 2022. The Company is currently evaluating the impact of Topic 848 on the consolidated financial statements.

Income (Loss) per Share (Tables

Income (Loss) per Share (Tables)	9 Months Ended
	Sep. 30, 2021
Earnings Per Share [Abstract]
Computation of Basic and Diluted Income Per Share	The following table is the computation of basic and diluted income per share: Three Months Ended September 30, Nine Months Ended September 30, 2021 2020 2021 2020 Basic Income Per Share computation: Numerator: Net income (loss) $ 664 $ 1,042 $ (167 ) $ 1,546 Denominator: Weighted shares outstanding - basic 17,945,053 18,198,567 18,077,506 18,184,441 Net income per common share - basic Net income (loss) $ 0.04 $ 0.06 $ (0.01 ) $ 0.09 Diluted Income Per Share computation: Denominator: Weighted shares outstanding - basic 17,945,053 18,198,567 18,077,506 18,184,441 Restricted shares subject to vesting 16,633 87,006 0 167,296 Performance related awards 0 23,943 0 23,943 Common stock option grants 0 1,256 0 5,976 Weighted shares outstanding - diluted 17,961,686 18,310,772 18,077,506 18,381,656 Net income per common share - diluted Net income (loss) $ 0.04 $ 0.06 $ (0.01 ) $ 0.08

Business Combinations (Tables)

Business Combinations (Tables)	9 Months Ended
	Sep. 30, 2021
Business Combinations [Abstract]
Schedule of Fair Value Purchase Consideration	The following table summarizes the fair value of purchase consideration to acquire Smarteq: Fair value of purchase consideration Cash $ 6,785 Working capital adjustment (5 ) Total purchase consideration $ 6,780
Schedule of Fair Value Recognized Identified Assets Acquired and Liabilities Assumed	The following is an allocation of the purchase price as of the April 30, 2021 closing date based upon a preliminary estimate of the fair value of the assets acquired and liabilities assumed by the Company in the acquisition: Preliminary Purchase Price Allocation: Cash $ 503 Accounts receivable 1,415 Prepaid expenses and other assets 109 Inventories 1,286 Right of use assets 232 Property and equipment 131 Intangible assets 1,983 Accounts payable (981 ) Accrued liabilities (837 ) Lease liabilities - short-term (102 ) Lease liabilities - long-term (112 ) Debt (91 ) Identifiable assets acquired $ 3,536 Goodwill 3,244 Total purchase price $ 6,780
Schedule of Intangible Assets Acquired and Expected Lives for Finite-Lived Intangible Assets	The following is a summary of identifiable intangible assets acquired and the related expected lives for the finite-lived intangible assets: Finite-lived assets: Customer relationships $ 787 Trade names 639 Technology 438 Other intangible assets 119 $ 1,983 Intangible Assets: Useful Life Customer relationships 5 years Trade names 5 years Technology 5 years Other intangible assets .5 to 5 years
Supplemental Proforma Financial Information	The following unaudited pro forma financial information presents the combined results of operations for each of the periods presented as if the Smarteq acquisition had occurred as of January 1, 2020: Three Months Ended September 30, Nine Months Ended September 30, 2021 2020 2021 2020 Net Revenue - pro forma combined $ 22,411 $ 23,503 $ 64,517 $ 62,420 Net Income - pro forma combined 797 620 493 314 Weighted Average Shares: Basic 17,945 18,199 18,078 18,184 Diluted 17,962 18,311 18,078 18,382 Net Income per Share: Basic $ 0.04 $ 0.03 $ 0.03 $ 0.02 Diluted $ 0.04 $ 0.03 $ 0.03 $ 0.02 The following adjustments were included in the unaudited pro forma combined net revenues: Three Months Ended September 30, Nine Months Ended September 30, 2021 2020 2021 2020 Net Revenue $ 22,411 $ 18,923 $ 61,799 $ 56,271 Add: Net Revenue - acquired business 0 4,580 2,718 6,149 Net Revenue - pro forma combined $ 22,411 $ 23,503 $ 64,517 $ 62,420 The following adjustments were included in the unaudited pro forma combined net income (loss): Three Months Ended September 30, Nine Months Ended September 30, 2021 2020 2021 2020 Net Income (Loss) $ 664 $ 1,042 $ (167 ) $ 1,546 Add: Results of operations of acquired business 0 $ (94 ) 183 (26 ) Less: pro forma adjustments Amortization of intangibles 3 (99 ) (226 ) (296 ) Inventory fair value adjustments 133 (222 ) 416 (444 ) Acquisition related expenses 0 0 304 (425 ) Interest expense (3 ) (7 ) (17 ) (41 ) Net Income - pro forma combined $ 797 $ 620 $ 493 $ 314

Cash, Cash Equivalents and In_2

Cash, Cash Equivalents and Investments (Tables)	9 Months Ended
	Sep. 30, 2021
Cash And Cash Equivalents [Abstract]
Cash and Cash Equivalents and Investments	The Company’s cash, cash equivalents, and investments consisted of the following: September 30, December 31, 2021 2020 Cash $ 8,342 $ 4,740 Cash equivalents 1,430 1,021 Short-term investments 22,680 30,582 Long-term investments 0 4,640 Total $ 32,452 $ 40,983
Cash Equivalents and Investments	Cash equivalents and investments were as follows at September 30 September 30, 2021 December 31, 2020 Level 1 Level 2 Total Level 1 Level 2 Total Cash equivalents: Certificates of deposit $ 0 $ 0 $ 0 $ 300 $ 0 $ 300 Money market funds 1,430 0 1,430 721 0 721 Total Cash Equivalents $ 1,430 $ 0 $ 1,430 $ 1,021 $ 0 $ 1,021 Short-Term Investments: Corporate bonds $ 0 $ 21,274 $ 21,274 $ 0 $ 26,318 $ 26,318 Certificates of deposit 1,406 0 1,406 4,264 0 4,264 Total Short-Term Investments $ 1,406 $ 21,274 $ 22,680 $ 4,264 $ 26,318 $ 30,582 Long-Term Investments: Corporate bonds $ 0 $ 0 $ 0 $ 0 $ 4,382 $ 4,382 Certificates of deposit 0 0 0 258 0 258 Total Long-Term Investments $ 0 $ 0 $ 0 $ 258 $ 4,382 $ 4,640 Cash equivalents and Investments - book value $ 2,836 $ 21,274 $ 24,110 $ 5,543 $ 30,700 $ 36,243 Unrealized gains (losses) $ 0 $ 4 $ 4 $ (1 ) $ (7 ) $ (8 ) Cash equivalents and Investments - fair value $ 2,836 $ 21,278 $ 24,114 $ 5,542 $ 30,693 $ 36,235

Goodwill and Intangible Assets

Goodwill and Intangible Assets (Tables)	9 Months Ended
	Sep. 30, 2021
Goodwill And Intangible Assets Disclosure [Abstract]
Summary of Carrying Amount of Goodwill	The change in the carrying amount of goodwill during the nine months ended September 30, 2021 is as follows: Amount Balance at December 31, 2020 $ 3,332 Acquisition of Smarteq 3,244 Foreign currency translation (147 ) Balance at September 30, 2021 $ 6,429
Summary of Amortization Expense	The summary of amortization expense in the condensed consolidated statement of operations is as follows: Three Months Ended September 30, Nine Months Ended September 30, 2021 2020 2021 2020 Cost of revenues $ 21 $ 0 $ 36 $ 111 Operating expenses 80 0 135 33 Total $ 101 $ 0 $ 171 $ 144
Summary of Other Intangible Assets	The summary of other intangible assets, net are as follows: September 30, 2021 December 31, 2020 Accumulated Net Book Accumulated Net Book Cost Amortization Value Cost Amortization Value Customer contracts and relationships $ 17,632 $ 16,943 $ 689 $ 16,880 $ 16,880 $ 0 Patents and technology 10,062 9,678 384 9,644 9,644 0 Trademarks and trade names 1,581 1,023 558 972 972 0 Other intangible assets 114 18 96 0 0 0 Total $ 29,389 $ 27,662 $ 1,727 $ 27,496 $ 27,496 $ 0
Summary of Assigned Lives and Weighted Average Amortization Periods by Intangible Asset Category	The assigned lives and weighted average amortization periods by intangible asset category are summarized below: Intangible Assets Assigned Life Weighted Average Amortization Period Customer contracts and relationships 5 years 5.0 Patents and technology 5 years 5.0 Trademarks and trade names 5 years 5.0 Other .5 to 5 years 3.6
Schedule of Future Amortization Expenses	The future amortization expenses are as follows: Fiscal Year Amount 2021 (remaining three months) $ 98 2022 $ 386 2023 $ 386 2024 $ 372 2025 $ 364 Thereafter $ 121 Total $ 1,727

Balance Sheet Information (Tabl

Balance Sheet Information (Tables)	9 Months Ended
	Sep. 30, 2021
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Summary of Allowances for Accounts Receivable	The allowances for accounts receivable consisted of the following: September 30, 2021 December 31, 2020 Credit loss provision $ 27 $ 66 Credit allowances 35 47 Total allowances $ 62 $ 113
Summary of Allowance for credit losses	The following table summarizes the allowance for credit losses activity during the nine months ended September 30, 2021: Balance at December 31, 2020 $ 66 Current period benefit for credit losses (39 ) Balance at September 30, 2021 $ 27
Summary of Inventories, Net	Inventories, net consisted of the following: September 30, 2021 December 31, 2020 Raw materials $ 5,838 $ 5,315 Work-in-process 852 883 Finished goods 6,293 3,786 Inventories, net $ 12,983 $ 9,984
Summary of Property and Equipment	Property and equipment consisted of the following: September 30, 2021 December 31, 2020 Building $ 6,892 $ 6,868 Computers and office equipment 10,598 10,039 Manufacturing and test equipment 16,859 15,394 Furniture and fixtures 1,443 1,437 Leasehold improvements 3,007 2,973 Motor vehicles 20 20 Total property and equipment 38,819 36,731 Less: Accumulated depreciation and amortization (28,220 ) (25,996 ) Land 1,770 1,770 Property and equipment, net $ 12,369 $ 12,505
Summary of Accrued Liabilities	Accrued liabilities consisted of the following: September 30, 2021 December 31, 2020 Inventory receipts $ 4,292 $ 3,049 Paid time off 1,393 1,028 Payroll and other employee benefits 1,799 1,083 Professional fees and contractors 295 316 Employee stock purchase plan 446 224 Operating leases 456 269 Warranties 272 285 Deferred revenues 324 242 Real estate taxes 117 155 Income and sales taxes 276 185 Customer refunds for estimated returns 218 146 Finance leases 68 68 Restructuring 0 15 Other 313 251 Total $ 10,269 $ 7,316
Summary of Long-term Liabilities	Long-term liabilities consisted of the following: September 30, 2021 December 31, 2020 Operating leases $ 3,691 $ 3,949 Deferred payroll taxes 243 243 Finance leases 104 96 Deferred revenue 86 76 Other 114 23 Total $ 4,238 $ 4,387

Stock-Based Compensation (Table

Stock-Based Compensation (Tables)	9 Months Ended
	Sep. 30, 2021
Summary of Stock-Based Compensation Expense by Type	The stock-based compensation expense by type is as follows: Three Months Ended September 30, Nine Months Ended September 30, 2021 2020 2021 2020 Service-based awards $ 341 $ 462 $ 1,435 $ 1,749 Performance-based awards (short-term incentive plan) (196 ) 0 0 0 Performance-based awards (long-term incentive plan) 160 (88 ) 394 67 Employee stock purchase plan 67 59 200 180 Total $ 372 $ 433 $ 2,029 $ 1,996
Stock-Based Compensation	Total stock-based compensation is reflected in the condensed consolidated statements of operations as follows: Three Months Ended September 30, Nine Months Ended September 30, 2021 2020 2021 2020 Cost of revenues $ 51 $ 61 $ 185 $ 207 Research and development 102 121 384 403 Sales and marketing 73 115 458 429 General and administrative 146 136 1,002 957 Total $ 372 $ 433 $ 2,029 $ 1,996 The following table presents a summary of the remaining unrecognized share-based compensation expense related to outstanding share-based awards as of September 30, 2021: Award Type Remaining Unrecognized Compensation Expense Weighted Average Life (Years) Service-based awards $ 1,816 1.4 Performance-based awards $ 2,096 2.2
Summary of Stock Option Activity	The following tables summarizes the stock option activity for the nine months ended September 30, 2021: Options Outstanding Weighted Average Exercise Price Outstanding at December 31, 2020 16,250 $ 6.54 Options exercised (6,000 ) 5.48 Options cancelled/expired (6,250 ) 7.89 Outstanding at September 30, 2021 4,000 $ 6.02 Exercisable at September 30, 2021 3,790 $ 5.97
Information about Stock Options Outstanding Under all Stock Plans	The following table summarizes information about stock options outstanding under all stock option plans: Options Outstanding Options Exercisable Range of Exercise Prices Number Outstanding Weighted Average Contractual Life (Years) Intrinsic Value Weighted- Average Exercise Price Number Exercisable Weighted Average Contractual Life (Years) Intrinsic Value Weighted Average Exercise Price $ 5.06 - $ 6.98 4,000 2.67 $ 2 $ 6.02 3,790 2.63 $ 2 $ 5.97 Weighted Average Contractual Life (years) Intrinsic Value Options Outstanding 2.67 $ 2 Options Exercisable 2.63 $ 2
Summary of Performance Share Activity	The following table summarizes the performance award activity: Awards at Target Weighted Average Fair Value Unvested Performance Awards - December 31, 2020 316,726 $ 6.84 Awards granted 187,864 8.15 Unvested Performance Awards - September 30, 2021 504,590 $ 7.33
Summary Of Active Performance-Based Long-Term Incentive Plans	The following table summarizes the active performance-based long-term incentive plans at September 30, 2021: Number of Shares Share Price That Could Be Earned: LTIP award on Grant Date Target Maximum Performance Period 2019 LTIP $ 5.27 171,437 295,325 January 1, 2019 through December 31, 2021 2020 LTIP $ 8.70 145,289 254,256 January 1, 2020 through December 31, 2022 2021 LTIP $ 8.15 187,864 328,762 January 1, 2021 through December 31, 2023 504,590 878,343
Calculation of Fair Value of Each Employee Stock Purchase Grant Using Black-Scholes Option-Pricing Model	The Company calculated the fair value of each employee stock purchase grant on the date of grant using the Black-Scholes option-pricing model using the following assumptions: Employee Stock Purchase Plan 2021 2020 Dividend yield 3.1 % 4.1 % Risk-free interest rate 0.1 % 0.1 % Expected volatility 48 % 44 % Expected life (in years) 0.5 0.5
Summary of Director Awards Activity	The following table summarizes the director awards activity: Shares Weighted Average Fair Value Outstanding - December 31, 2020 2,416 $ 6.90 Shares awarded 61,186 6.57 Shares vested (52,068 ) 6.65 Outstanding - September 30, 2021 11,534 $ 6.57
Restricted Stock [Member]
Summary of Service-based Restricted Stock Activity	The following table summarizes service-based restricted stock activity for the nine months ended September 30, 2021: Shares Weighted Average Fair Value Unvested Restricted Stock Awards - December 31, 2020 432,422 $ 6.90 Shares awarded 170,158 8.04 Shares vested (270,607 ) 6.60 Shares cancelled (3,102 ) 7.76 Unvested Restricted Stock Awards - September 30, 2021 328,871 $ 7.75
Restricted Stock Units [Member]
Summary of Service-based Restricted Stock Activity	The following table summarizes the restricted stock unit activity during the nine months ended September 30, 2021: Shares Weighted Average Fair Value Unvested Restricted Stock Units - December 31, 2020 9,083 $ 7.02 Units awarded 17,800 7.11 Units vested/Shares awarded (5,446 ) 6.47 Unvested Restricted Stock Units - September 30, 2021 21,437 $ 7.23

Benefit Plans (Tables)

Benefit Plans (Tables)	9 Months Ended
	Sep. 30, 2021
Compensation And Retirement Disclosure [Abstract]
Summary of Contributions to Retirement Plans	The Company’s contributions to retirement plans during the three and nine months ended September 30, 2021 and 2020, respectively, were as follows: Three Months Ended September 30, Nine Months Ended September 30, 2021 2020 2021 2020 PCTEL, Inc. 401(k) profit sharing plan - U.S. employees $ 184 $ 164 $ 540 $ 560 Defined contribution plans - foreign employees 115 9 322 41 Total $ 299 $ 173 $ 862 $ 601

Commitments and Contingencies (

Commitments and Contingencies (Tables)	9 Months Ended
	Sep. 30, 2021
Commitments And Contingencies Disclosure [Abstract]
Summary of Restructuring Activity	The following table summarizes the restructuring activity during the nine months ended September 30, 2021 and the status of the reserves at September 30 Lease Severance Termination Total Balance at December 31, 2020 $ 0 $ 15 $ 15 Restructuring expense 59 0 59 Payments made (59 ) (15 ) (74 ) Balance at September 30, 2021 $ 0 $ 0 $ 0
Summary of Warranty Activity	The following table summarizes the warranty activity during the nine months ended September 30, 2021 and 2020: Nine Months Ended September 30, 2021 2020 Beginning balance $ 285 $ 444 Provisions for warranties 64 9 Consumption of reserves (77 ) (203 ) Ending balance $ 272 $ 250

Leases (Tables)

Leases (Tables)	9 Months Ended
	Sep. 30, 2021
Leases [Abstract]
Components of Lease Cost	The Company's lease cost for the three and nine months ended September 30, 2021 and 2020, respectively, included the following components: Three Months Ended September 30, Nine Months Ended September 30, 2021 2020 2021 2020 Operating lease costs $ 121 $ 128 $ 333 $ 538 Short-term lease costs 41 50 123 77 Variable lease costs 5 0 9 2 Amortization of finance lease assets 18 18 53 59 Interest on finance lease liabilities 2 2 6 6 Total lease cost $ 187 $ 198 $ 524 $ 682
Schedule of Future Minimum Lease Payments under Operating and Finance Leases	The table below summarizes the Company's scheduled future minimum lease payments under operating and finance leases recorded on the balance sheet as of September 30, 2021: Year Operating Leases Finance Leases 2021 (remaining three months) $ 124 $ 21 2022 655 66 2023 610 44 2024 581 33 2025 501 15 Thereafter 2,674 5 Total minimum payments required 5,145 184 Less: amount representing interest 998 12 Present value of net minimum lease payments 4,147 172 Less: current maturities of lease obligations (456 ) (68 ) Long-term lease obligations $ 3,691 $ 104
Summary of Weighted Average Remaining Lease Terms and Discount Rates	The weighted average remaining lease terms and discount rates for all the Company’s operating and finance leases were as follows as of September 30, 2021: September 30, 2021 Weighted-average remaining lease term - finance leases 3.1 years Weighted-average remaining lease term - operating leases 8.7 years Weighted-average discount rate - finance leases 3.9% Weighted-average discount rate - operating leases 5.0%
Schedule of Supplemental Cash Flow Information Related to Leases	The table below presents supplemental cash flow information related to leases during the three and nine months ended September 30, 2021 and 2020, respectively: Three Months Ended September 30, Nine Months Ended September 30, 2021 2020 2021 2020 Cash paid for (received) amounts included in the measurement of lease liabilities: Operating cash flows for operating leases $ 160 $ 33 $ 413 $ 262 Operating cash flows from tenant improvement incentives from operating leases $ 0 $ 0 $ 0 $ (1,004 ) Operating cash flows for finance leases $ 2 $ 2 $ 6 $ 6 Financing cash flows for finance leases $ 25 $ 18 $ 54 $ 59
Schedule of Classification of ROU Assets and Lease liabilities	The following table summarizes the classification of ROU assets and lease liabilities as of September 30, 2021 and December 31, 2020: Leases Consolidated Balance Sheet Classification September 30, 2021 December 31, 2020 Assets: Operating right-of-use assets Other noncurrent assets $ 2,307 $ 2,272 Finance right-of-use assets Other noncurrent assets 167 157 Total leased assets $ 2,474 $ 2,429 Liabilities: Current Operating lease liabilities Accrued liabilities $ 456 $ 269 Finance lease liabilities Accrued liabilities 68 68 Noncurrent Operating lease liabilities Long-term liabilities 3,691 3,949 Finance lease liabilities Long-term liabilities 104 96 Total lease liabilities $ 4,319 $ 4,382

Product Line and Geographic I_2

Product Line and Geographic Information (Tables)	9 Months Ended
	Sep. 30, 2021
Result of Product Line Revenues and Gross Profits	Product Line Information: The following tables are the product line revenues and gross profits for the three and nine months ended September 30, 2021 and 2020: Three Months Ended September 30, 2021 Antennas & Industrial IoT Devices Test & Measurement Products Corporate Total Revenues $ 16,686 $ 5,921 $ (196 ) $ 22,411 Gross Profit $ 5,655 $ 4,635 $ (36 ) $ 10,254 Gross Profit % 33.9 % 78.3 % NA 45.8 % Nine Months Ended September 30, 2021 Antennas & Industrial IoT Devices Test & Measurement Products Corporate Total Revenues $ 43,971 $ 18,540 $ (712 ) $ 61,799 Gross Profit $ 14,578 $ 14,057 $ (102 ) $ 28,533 Gross Profit % 33.2 % 75.8 % NA 46.2 % Three Months Ended September 30, 2020 Antennas & Industrial IoT Devices Test & Measurement Products Corporate Total Revenues $ 12,326 $ 6,810 $ (213 ) $ 18,923 Gross Profit $ 4,336 $ 5,203 $ 36 $ 9,575 Gross Profit % 35.2 % 76.4 % NA 50.6 % Nine Months Ended September 30, 2020 Antennas & Industrial IoT Devices Test & Measurement Products Corporate Total Revenues $ 37,696 $ 19,011 $ (436 ) $ 56,271 Gross Profit $ 13,228 $ 14,109 $ (26 ) $ 27,311 Gross Profit % 35.1 % 74.2 % NA 48.5 %
Customers Accounted Revenues by Geographic Location	Geographic Information: The Company’s revenue from customers by geographic location, as a percent of total revenues for the three and nine months ended September 30, 2021 and 2020, is as follows: Three Months Ended September 30, Nine Months Ended September 30, Region 2021 2020 2021 2020 Europe, Middle East & Africa 23% 16% 23% 16% Asia Pacific 9% 8% 8% 9% Other Americas 3% 3% 4% 2% Total Foreign sales 35% 27% 35% 27%
Accounts Receivable
Schedule of Total Trade Accounts Receivable Represents Customers Accounted for 10% or More Percentage	The following table represents the customers that accounted for 10% or more of total trade accounts receivable: Trade Accounts Receivable September 30, 2021 December 31, 2020 Customer B 12% 10% Customer C 3% 31%

Basis of Presentation - Additio

Basis of Presentation - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Percentage of revenue transacted in foreign currency			9.00%	3.00%
Percentage of expenses transacted in foreign currency			20.00%	19.00%
Net foreign exchange gains (losses) resulting from foreign currency transactions included in other income	$ (10)	$ (158)	$ (54)	$ (139)

Income (Loss) per Share - Compu

Income (Loss) per Share - Computation of Basic and Diluted Income Per Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Numerator:
NET INCOME (LOSS)	$ 664	$ 1,042	$ (167)	$ 1,546
Denominator:
Weighted shares outstanding - basic	17,945,053	18,198,567	18,077,506	18,184,441
Net income per common share - basic
Net income (loss)	$ 0.04	$ 0.06	$ (0.01)	$ 0.09
Weighted Average Shares:
Weighted shares outstanding - basic	17,945,053	18,198,567	18,077,506	18,184,441
Common stock option grants	0	1,256,000	0	5,976,000
Weighted shares outstanding - diluted	17,961,686	18,310,772	18,077,506	18,381,656
Net income per common share - diluted
Net income (loss)	$ 0.04	$ 0.06	$ (0.01)	$ 0.08
Restricted Stock [Member]
Weighted Average Shares:
Performance related awards/Restricted shares subject to vesting	16,633,000	87,006,000	0	167,296,000
Performance Related Awards [Member]
Weighted Average Shares:
Performance related awards/Restricted shares subject to vesting	0	23,943,000	0	23,943,000

Business Combinations - Additio

Business Combinations - Additional Information (Detail) $ in Thousands, kr in Millions	Apr. 30, 2021USD ($)ft²	Apr. 30, 2021SEK (kr)	Sep. 30, 2021USD ($)	Sep. 30, 2020USD ($)	Sep. 30, 2021USD ($)	Sep. 30, 2020USD ($)	Jun. 30, 2021USD ($)	Dec. 31, 2020USD ($)
Business Acquisition [Line Items]
Payments for business acquisition, net of cash					$ 6,277	$ 0
Fair value of adjusted inventory			$ 500		500
Fair value of Inventory recognized			100		400
Right of Use Asset			2,307		2,307			$ 2,272
Operating lease liability			4,147		4,147
Net deferred tax assets			15,300		15,300			12,900
Goodwill			6,429		6,429			$ 3,332
Revenue			22,411	$ 18,923	61,799	56,271
Net income (loss)			664	$ 1,042	(167)	$ 1,546
Smarteq [Member]
Business Acquisition [Line Items]
Working capital adjustments	$ 5
Total cash consideration	6,785
Cash	503
Debt	91
Gross accounts receivable	$ 1,415
Area of lease | ft²	4,080
Lease expiration date	Jul. 31, 2023	Jul. 31, 2023
Right of Use Asset	$ 200
Operating lease liability	200
Goodwill	$ 3,244
Transaction costs							$ 300
Revenue			2,300		3,900
Net income (loss)			$ 100		$ (100)
Smarteq France [Member]
Business Acquisition [Line Items]
Loan term	5 years	5 years
Loan amount	$ 100
Loan interest rate	0.57%	0.57%
Loan maturity date	May 31, 2026	May 31, 2026
Net deferred tax assets	$ 2,400
SPA [Member] | Smarteq [Member]
Business Acquisition [Line Items]
Cash purchase price | kr		kr 53
Working capital adjustments | kr		1.6
Net cash adjustment | kr		kr 2.1
Total cash consideration	56,800
Payments for business acquisition, net of cash	$ 6,800

Business Combinations - Schedul

Business Combinations - Schedule of Fair Value Purchase Consideration (Detail) - Smarteq [Member] $ in Thousands	Apr. 30, 2021USD ($)
Business Acquisition [Line Items]
Cash	$ 6,785
Working capital adjustment	(5)
Total purchase consideration	$ 6,780

Business Combinations - Sched_2

Business Combinations - Schedule of Fair Value Recognized Identified Assets Acquired and Liabilities Assumed (Detail) - USD ($) $ in Thousands	Apr. 30, 2021	Sep. 30, 2021	Dec. 31, 2020
Business Acquisition [Line Items]
Intangible assets	$ 1,983
Goodwill		$ 6,429	$ 3,332
Smarteq [Member]
Business Acquisition [Line Items]
Cash	503
Accounts receivable	1,415
Prepaid expenses and other assets	109
Inventories	1,286
Right of use assets	232
Property and equipment	131
Intangible assets	1,983
Accounts payable	(981)
Accrued liabilities	(837)
Lease liabilities - short-term	(102)
Lease liabilities - long-term	(112)
Debt	(91)
Identifiable assets acquired	3,536
Goodwill	3,244
Total purchase price	$ 6,780

Business Combinations - Sched_3

Business Combinations - Schedule of Intangible Assets Acquired and Expected Lives for Finite-Lived Intangible Assets (Detail) $ in Thousands	Apr. 30, 2021USD ($)
Acquired Finite Lived Intangible Assets [Line Items]
Intangible assets	$ 1,983
Customer Relationships [Member]
Acquired Finite Lived Intangible Assets [Line Items]
Intangible assets	$ 787
Finite-lived intangible assets useful life	5 years
Trade Names [Member]
Acquired Finite Lived Intangible Assets [Line Items]
Intangible assets	$ 639
Finite-lived intangible assets useful life	5 years
Technology [Member]
Acquired Finite Lived Intangible Assets [Line Items]
Intangible assets	$ 438
Finite-lived intangible assets useful life	5 years
Other Intangible Assets [Member]
Acquired Finite Lived Intangible Assets [Line Items]
Intangible assets	$ 119
Other Intangible Assets [Member] | Minimum [Member]
Acquired Finite Lived Intangible Assets [Line Items]
Finite-lived intangible assets useful life	6 months
Other Intangible Assets [Member] | Maximum [Member]
Acquired Finite Lived Intangible Assets [Line Items]
Finite-lived intangible assets useful life	5 years

Business Combinations - Supplem

Business Combinations - Supplemental Proforma Financial Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Business Combinations [Abstract]
Net Revenue - pro forma combined	$ 22,411	$ 23,503	$ 64,517	$ 62,420
Net Income - pro forma combined	$ 797	$ 620	$ 493	$ 314
Weighted Average Shares:
Basic	17,945	18,199	18,078	18,184
Diluted	17,962	18,311	18,078	18,382
Net Income per Share:
Basic	$ 0.04	$ 0.03	$ 0.03	$ 0.02
Diluted	$ 0.04	$ 0.03	$ 0.03	$ 0.02

Business Combinations - Suppl_2

Business Combinations - Supplemental Proforma Combined Net Revenues (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Business Combinations [Abstract]
Net Revenue	$ 22,411	$ 18,923	$ 61,799	$ 56,271
Add: Net Revenue - acquired business	0	4,580	2,718	6,149
Net Revenue - pro forma combined	$ 22,411	$ 23,503	$ 64,517	$ 62,420

Business Combinations - Suppl_3

Business Combinations - Supplemental Proforma Combined Net Income (Loss) (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Business Combinations [Abstract]
Net Income (Loss)	$ 664	$ 1,042	$ (167)	$ 1,546
Add: Results of operations of acquired business	0	(94)	183	(26)
Less: pro forma adjustments
Amortization of intangibles	3	(99)	(226)	(296)
Inventory fair value adjustments	133	(222)	416	(444)
Acquisition related expenses	0	0	304	(425)
Interest expense	(3)	(7)	(17)	(41)
Net Income - pro forma combined	$ 797	$ 620	$ 493	$ 314

Cash, Cash Equivalents and In_3

Cash, Cash Equivalents and Investments - Cash and Cash Equivalents and Investments (Detail) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Cash And Cash Equivalents [Abstract]
Cash	$ 8,342	$ 4,740
Cash equivalents	1,430	1,021
Short-term investments	22,680	30,582
Long-term investment securities	0	4,640
Cash and investments	$ 32,452	$ 40,983

Cash, Cash Equivalents and In_4

Cash, Cash Equivalents and Investments - Additional Information (Detail) - USD ($)	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents maturities	90 days	90 days
Investment of cash equivalents are redeemable upon demand using amortized cost method	$ 1
Investment in money market funds restricted by investment in short term securities, percentage	100.00%
Cash and cash equivalents in foreign bank	$ 3,600,000	$ 2,900,000
Short-term investments, maturities, minimum	90 days
Short-term investments, maturities, maximum	1 year
Long-term investments, maturities, minimum	1 year
Long-term investments, maturities, maximum	2 years
Unrealized gains (losses)	$ 4,000	(8,000)
Realized gains (losses)	4,000
CHINA
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents in foreign bank	2,600,000	$ 2,900,000
CHINA | Cash Equivalents [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents in foreign bank	$ 1,100,000
Maturity period of cash deposit	90 days
CHINA | Cash [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents in foreign bank	$ 1,500,000
Sweden
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents in foreign bank	900,000
France
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents in foreign bank	100,000
Maximum [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Federal Deposit Insurance Corporation insured limit	$ 250,000

Cash, Cash Equivalents and In_5

Cash, Cash Equivalents and Investments - Cash Equivalents and Investments (Detail) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash equivalents	$ 1,430	$ 1,021
Short-term investments	22,680	30,582
Long-term investment securities	0	4,640
Cash equivalents and Investments - book value	24,110	36,243
Unrealized gains (losses)	4	(8)
Cash equivalents and Investments - fair value	24,114	36,235
Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash equivalents	1,430	1,021
Short-term investments	1,406	4,264
Long-term investment securities	0	258
Cash equivalents and Investments - book value	2,836	5,543
Unrealized gains (losses)	0	(1)
Cash equivalents and Investments - fair value	2,836	5,542
Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash equivalents	0	0
Short-term investments	21,274	26,318
Long-term investment securities	0	4,382
Cash equivalents and Investments - book value	21,274	30,700
Unrealized gains (losses)	4	(7)
Cash equivalents and Investments - fair value	21,278	30,693
Certificates of Deposit [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash equivalents	0	300
Short-term investments	1,406	4,264
Long-term investment securities	0	258
Certificates of Deposit [Member] | Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash equivalents	0	300
Short-term investments	1,406	4,264
Long-term investment securities	0	258
Certificates of Deposit [Member] | Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash equivalents	0	0
Short-term investments	0	0
Long-term investment securities	0	0
Money Market Funds [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash equivalents	1,430	721
Money Market Funds [Member] | Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash equivalents	1,430	721
Money Market Funds [Member] | Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash equivalents	0	0
Corporate Bonds [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Short-term investments	21,274	26,318
Long-term investment securities	0	4,382
Corporate Bonds [Member] | Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Short-term investments	0	0
Long-term investment securities	0	0
Corporate Bonds [Member] | Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Short-term investments	21,274	26,318
Long-term investment securities	$ 0	$ 4,382

Goodwill and Intangible Asset_2

Goodwill and Intangible Assets - Summary of Carrying Amount of Goodwill (Detail) $ in Thousands	9 Months Ended
	Sep. 30, 2021USD ($)
Finite Lived Intangible Assets [Line Items]
Balance at December 31, 2020	$ 3,332
Foreign currency translation	(147)
Balance at September 30, 2021	6,429
Smarteq Wireless Aktiebolag [Member]
Finite Lived Intangible Assets [Line Items]
Acquisition of Smarteq	$ 3,244

Goodwill and Intangible Asset_3

Goodwill and Intangible Assets - Additional Information (Detail) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended		9 Months Ended
	Apr. 30, 2021	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Finite Lived Intangible Assets [Line Items]
Amortization of intangible assets		$ 80	$ 0	$ 135	$ 32
Foreign currency translation adjustment				100
Operating Expense [Member]
Finite Lived Intangible Assets [Line Items]
Amortization of intangible assets				$ 200
Smarteq Wireless Aktiebolag [Member]
Finite Lived Intangible Assets [Line Items]
Finite-lived intangible assets	$ 2,000
Minimum [Member]
Finite Lived Intangible Assets [Line Items]
Amortization of intangible assets basis over estimated useful lives				1 year
Maximum [Member]
Finite Lived Intangible Assets [Line Items]
Amortization of intangible assets basis over estimated useful lives				5 years

Goodwill and Intangible Asset_4

Goodwill and Intangible Assets - Summary of Amortization Expense (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Finite Lived Intangible Assets [Line Items]
Amortization expense, total	$ 101	$ 0	$ 171	$ 144
Cost of Revenues [Member]
Finite Lived Intangible Assets [Line Items]
Amortization expense, total	21	0	36	111
Operating Expense [Member]
Finite Lived Intangible Assets [Line Items]
Amortization expense, total	$ 80	$ 0	$ 135	$ 33

Goodwill and Intangible Asset_5

Goodwill and Intangible Assets - Summary of Other Intangible Assets (Detail) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Finite Lived Intangible Assets [Line Items]
Cost	$ 29,389	$ 27,496
Accumulated Amortization	27,662	27,496
Net Book Value	1,727	0
Customer Contracts and Relationships [Member]
Finite Lived Intangible Assets [Line Items]
Cost	17,632	16,880
Accumulated Amortization	16,943	16,880
Net Book Value	689	0
Patents and Technology [Member]
Finite Lived Intangible Assets [Line Items]
Cost	10,062	9,644
Accumulated Amortization	9,678	9,644
Net Book Value	384	0
Trademarks and Trade Names [Member]
Finite Lived Intangible Assets [Line Items]
Cost	1,581	972
Accumulated Amortization	1,023	972
Net Book Value	558	0
Other Intangible Assets [Member]
Finite Lived Intangible Assets [Line Items]
Cost	114	0
Accumulated Amortization	18	0
Net Book Value	$ 96	$ 0

Goodwill and Intangible Asset_6

Goodwill and Intangible Assets - Summary of Assigned Lives and Weighted Average Amortization Periods by Intangible Asset Category (Detail)	9 Months Ended
	Sep. 30, 2021
Minimum [Member]
Summary of assigned lives and weighted average amortization periods by intangible asset category
Assigned Life	1 year
Maximum [Member]
Summary of assigned lives and weighted average amortization periods by intangible asset category
Assigned Life	5 years
Customer Contracts and Relationships [Member]
Summary of assigned lives and weighted average amortization periods by intangible asset category
Assigned Life	5 years
Weighted Average Amortization Period	5 years
Patents and Technology [Member]
Summary of assigned lives and weighted average amortization periods by intangible asset category
Assigned Life	5 years
Weighted Average Amortization Period	5 years
Trademarks and Trade Names [Member]
Summary of assigned lives and weighted average amortization periods by intangible asset category
Assigned Life	5 years
Weighted Average Amortization Period	5 years
Other Intangible Assets [Member]
Summary of assigned lives and weighted average amortization periods by intangible asset category
Weighted Average Amortization Period	3 years 7 months 6 days
Other Intangible Assets [Member] | Minimum [Member]
Summary of assigned lives and weighted average amortization periods by intangible asset category
Assigned Life	6 months
Other Intangible Assets [Member] | Maximum [Member]
Summary of assigned lives and weighted average amortization periods by intangible asset category
Assigned Life	5 years

Goodwill and Intangible Asset_7

Goodwill and Intangible Assets - Schedule of Future Amortization Expenses (Detail) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
2021 (remaining three months)	$ 98
2022	386
2023	386
2024	372
2025	364
Thereafter	121
Net Book Value	$ 1,727	$ 0

Balance Sheet Information - Add

Balance Sheet Information - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Property, Plant and Equipment [Line Items]
Allowance for credit losses	$ 30		$ 30		$ 70
Consigned inventory with customers	500		500		300
Allowance for inventory losses	4,000		4,000		$ 3,700
Depreciation and amortization	$ 800	$ 800	$ 2,300	$ 2,300
Equipment [Member]
Property, Plant and Equipment [Line Items]
Period over which assets are depreciated			5 years
Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Period over which assets are depreciated			7 years
Building [Member]
Property, Plant and Equipment [Line Items]
Period over which assets are depreciated			30 years
Minimum [Member]
Property, Plant and Equipment [Line Items]
Standard term of accounts receivable			30 days
Minimum [Member] | Computer Equipment and Software Licenses [Member]
Property, Plant and Equipment [Line Items]
Period over which assets are depreciated			3 years
Maximum [Member]
Property, Plant and Equipment [Line Items]
Standard term of accounts receivable			90 days
Useful lives of the assets			1 year
Maximum [Member] | Computer Equipment and Software Licenses [Member]
Property, Plant and Equipment [Line Items]
Period over which assets are depreciated			5 years

Balance Sheet Information - Sum

Balance Sheet Information - Summary of Allowances for Accounts Receivable (Detail) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Credit loss provision	$ 27	$ 66
Credit allowances	35	47
Total allowances	$ 62	$ 113

Balance Sheet Information - All

Balance Sheet Information - Allowance for credit losses (Detail) $ in Thousands	9 Months Ended
	Sep. 30, 2021USD ($)
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Balance at December 31, 2020	$ 66
Current period benefit for credit losses	(39)
Balance at September 30, 2021	$ 27

Balance Sheet Information - S_2

Balance Sheet Information - Summary of Inventories, Net (Detail) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Inventory Net [Abstract]
Raw materials	$ 5,838	$ 5,315
Work-in-process	852	883
Finished goods	6,293	3,786
Inventories, net	$ 12,983	$ 9,984

Balance Sheet Information - S_3

Balance Sheet Information - Summary of Property and Equipment (Detail) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 38,819	$ 36,731
Less: Accumulated depreciation and amortization	(28,220)	(25,996)
Land	1,770	1,770
Property and equipment, net	12,369	12,505
Building [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment	6,892	6,868
Computers and Office Equipment [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment	10,598	10,039
Manufacturing and Test Equipment [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment	16,859	15,394
Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment	1,443	1,437
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment	3,007	2,973
Motor Vehicles [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 20	$ 20

Balance Sheet Information - S_4

Balance Sheet Information - Summary of Accrued Liabilities (Detail) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020	Sep. 30, 2020	Dec. 31, 2019
Payables And Accruals [Abstract]
Inventory receipts	$ 4,292	$ 3,049
Paid time off	1,393	1,028
Payroll and other employee benefits	1,799	1,083
Professional fees and contractors	295	316
Employee stock purchase plan	446	224
Operating leases	456	269
Warranties	272	285	$ 250	$ 444
Deferred revenues	324	242
Real estate taxes	117	155
Income and sales taxes	276	185
Customer refunds for estimated returns	218	146
Finance leases	68	68
Restructuring	0	15
Other	313	251
Total	$ 10,269	$ 7,316

Balance Sheet Information - S_5

Balance Sheet Information - Summary of Long-term Liabilities (Detail) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Liabilities Noncurrent [Abstract]
Operating leases	$ 3,691	$ 3,949
Deferred payroll taxes	243	243
Finance leases	104	96
Deferred revenue	86	76
Other	114	23
Total	$ 4,238	$ 4,387

Stock-Based Compensation - Addi

Stock-Based Compensation - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Stock compensation expense	$ 372	$ 433	$ 2,029	$ 1,996

Stock-Based Compensation - Summ

Stock-Based Compensation - Summary of Stock-Based Compensation Expense by Type (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Stock Based Compensation [Line Items]
Total	$ 372	$ 433	$ 2,029	$ 1,996
Service-based Awards [Member]
Stock Based Compensation [Line Items]
Total	341	462	1,435	1,749
Performance-based Awards - Short-term Incentive Plan [Member]
Stock Based Compensation [Line Items]
Total	(196)	0	0	0
Performance-based Awards - Long-term Incentive Plan [Member]
Stock Based Compensation [Line Items]
Total	160	(88)	394	67
Employee Stock Purchase Plan [Member]
Stock Based Compensation [Line Items]
Total	$ 67	$ 59	$ 200	$ 180

Stock-Based Compensation - Stoc

Stock-Based Compensation - Stock-Based Compensation (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Stock compensation expense	$ 372	$ 433	$ 2,029	$ 1,996
Cost of Revenues [Member]
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Stock compensation expense	51	61	185	207
Research and Development [Member]
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Stock compensation expense	102	121	384	403
Sales and Marketing [Member]
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Stock compensation expense	73	115	458	429
General and Administrative [Member]
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Stock compensation expense	$ 146	$ 136	$ 1,002	$ 957

Stock-Based Compensation - Su_2

Stock-Based Compensation - Summary of Remaining Unrecognized Share-based Compensation Expense Related to Outstanding Share-based Awards (Detail) $ in Thousands	9 Months Ended
	Sep. 30, 2021USD ($)
Service-based Awards [Member]
Stock Based Compensation [Line Items]
Remaining unrecognized share-based compensation expense	$ 1,816
Share based compensation arrangement by share based payment award options weighted average life in years	1 year 4 months 24 days
Performance-based Awards [Member]
Stock Based Compensation [Line Items]
Remaining unrecognized share-based compensation expense	$ 2,096
Share based compensation arrangement by share based payment award options weighted average life in years	2 years 2 months 12 days

Stock-Based Compensation - Su_3

Stock-Based Compensation - Summary of Service-based Restricted Stock Activity (Detail) - Restricted Stock [Member]	9 Months Ended
	Sep. 30, 2021$ / sharesshares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unvested Beginning balance, Shares | shares	432,422
Shares awarded, Shares | shares	170,158
Shares vested, Shares | shares	(270,607)
Shares cancelled, Shares | shares	(3,102)
Unvested Ending balance, Shares | shares	328,871
Unvested Beginning balance, Weighted Average Fair Value | $ / shares	$ 6.90
Shares awarded, Weighted Average Fair Value | $ / shares	8.04
Shares vested, Weighted Average Fair Value | $ / shares	6.60
Shares cancelled, Weighted Average Fair Value | $ / shares	7.76
Unvested Ending balance, Weighted Average Fair Value | $ / shares	$ 7.75

Stock-Based Compensation - Rest

Stock-Based Compensation - Restricted Stock Units - Service Based - Additional Information (Detail) $ in Thousands	1 Months Ended				9 Months Ended
	Jun. 30, 2021shares	Mar. 31, 2021shares	Apr. 30, 2020shares	Feb. 29, 2020shares	Sep. 30, 2021USD ($)	Sep. 30, 2020USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock awards issued during the period		170,158,000	47,539,000
Restricted shares vested intrinsic value | $					$ 2,200	$ 1,900
Service Based Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock awards issued during the period				153,694,000
Stock award vesting term					Company issued to employees 153,694 service-based restricted stock awards under the LTIP that vest in three substantially equal annual increments commencing in 2021
Employee Salary Reduction Percentage			0.10
Vesting period			1 year
Restricted Stock Issued Against Salary Percentage			0.05
Service Based Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock awards issued during the period	15,000	2,800
Stock award vesting term					Company issued 15,000 service-based restricted stock units to employees of the Swedish subsidiary, Smarteq, with a four-year vesting period commencing in 2022
Vesting period					4 years
Restricted shares vested intrinsic value | $					$ 42	$ 44

Stock-Based Compensation - Su_4

Stock-Based Compensation - Summary of Restricted Stock Unit Activity (Detail) - Restricted Stock Units [Member]	9 Months Ended
	Sep. 30, 2021$ / sharesshares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unvested Beginning balance, Shares | shares	9,083
Units awarded, Shares | shares	17,800
Units vested/Shares awarded, Shares | shares	(5,446)
Unvested Ending balance, Shares | shares	21,437
Unvested Beginning balance, Weighted Average Fair Value | $ / shares	$ 7.02
Units awarded, Weighted Average Fair Value | $ / shares	7.11
Units vested/Shares awarded, Weighted Average Fair Value | $ / shares	6.47
Unvested Ending balance, Weighted Average Fair Value | $ / shares	$ 7.23

Stock-Based Compensation - St_2

Stock-Based Compensation - Stock Options - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share Price	$ 6.22
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee stock options vesting provisions, description	Employee stock options are subject to installment vesting typically over a period of not less than three years
Period of termination of employment	180 days
Stock options granted period	7 years
Options exercised	6,000
Intrinsic value	$ 53	$ 0.1
Options Outstanding, Granted	0	0
Period of expected life, options granted	5 years
Stock Options [Member] | Stock Option Plan One [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Proceeds From Stock Options Exercised	$ 8	$ 0.1
Options exercised		9,412
Stock Options [Member] | Stock Option Plan Two [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options exercised	6,000	52,355
Shares issued	1,420	10,194
Stock Options [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options vested in remaining period	3 years

Stock-Based Compensation - Su_5

Stock-Based Compensation - Summary of Stock Option Activity (Detail) - Stock Options [Member]	9 Months Ended
	Sep. 30, 2021$ / sharesshares
Summary Of Stock Option Activities [Line Items]
Options Outstanding, Beginning balance, Shares | shares	16,250
Options Outstanding, Exercised | shares	(6,000)
Options Outstanding, Cancelled/expired | shares	(6,250)
Options Outstanding, Ending balance, Shares | shares	4,000
Options Exercisable, Ending balance, Shares | shares	3,790
Weighted Average Exercise Price, Beginning balance | $ / shares	$ 6.54
Weighted Average Exercise Price, Exercised | $ / shares	5.48
Weighted Average Exercise Price, Options cancelled/expired | $ / shares	7.89
Weighted Average Exercise Price, Ending balance | $ / shares	6.02
Weighted Average Exercise Price, Ending balance | $ / shares	$ 5.97

Stock-Based Compensation - Info

Stock-Based Compensation - Information about Stock Options Outstanding Under all Stock Plans (Detail) $ / shares in Units, $ in Thousands	9 Months Ended
	Sep. 30, 2021USD ($)$ / sharesshares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding, Intrinsic Value | $	$ 2
Options Exercisable, Weighted Average Contractual Life (Years)	2 years 7 months 17 days
Options Exercisable, Intrinsic Value | $	$ 2
Options Outstanding, Weighted Average Contractual Life (Years)	2 years 8 months 1 day
Range One [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Lower range of exercise prices | $ / shares	$ 5.06
Upper range of exercise prices | $ / shares	$ 6.98
Options Outstanding, Number | shares	4,000
Options Outstanding, Weighted Average Contractual Life (Years)	2 years 8 months 1 day
Options Outstanding, Intrinsic Value | $	$ 2
Options Outstanding, Weighted-Average Exercise Price | $ / shares	$ 6.02
Options Exercisable, Number | shares	3,790
Options Exercisable, Weighted Average Contractual Life (Years)	2 years 7 months 17 days
Options Exercisable, Intrinsic Value | $	$ 2
Options Exercisable, Weighted Average Exercise Price | $ / shares	$ 5.97

Stock-Based Compensation - Shor

Stock-Based Compensation - Short-Term Incentive Plan - Additional Information (Detail)	9 Months Ended
	Sep. 30, 2021USD ($)
2021 STIP [Member] | Certain Executives [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage Of Incentive Awards In Shares	50.00%
Percentage of incentive awards in cash	50.00%
2020 STIP [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Proceeds from issuance of shares	$ 0

Stock-Based Compensation - Su_6

Stock-Based Compensation - Summary of Performance Share Activity (Detail) - Performance Related Awards [Member]	9 Months Ended
	Sep. 30, 2021$ / sharesshares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unvested Beginning balance, Shares | shares	316,726
Awards granted | shares	187,864
Unvested Ending balance, Shares | shares	504,590
Unvested Beginning balance, Weighted Average Fair Value | $ / shares	$ 6.84
Shares awarded, Weighted Average Fair Value | $ / shares	8.15
Unvested Ending balance, Weighted Average Fair Value | $ / shares	$ 7.33

Stock-Based Compensation - Long

Stock-Based Compensation - Long-Term Incentive Plan - Additional Information (Detail) - 2021 LTIP $ / shares in Units, shares in Thousands, $ in Millions	1 Months Ended
	Feb. 28, 2021USD ($)$ / sharesshares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Revenue growth target performance period start date	Jan. 1, 2021
Revenue growth target performance period end date	Dec. 31, 2023
Total fair market value of award at target | $	$ 1.5
Shares awarded, Weighted Average Fair Value | $ / shares	$ 8.15
Number of shares earned	187,864
Maximum number of shares that may be issued	328,762

Stock-Based Compensation - Su_7

Stock-Based Compensation - Summary Of Active Performance-Based Long-Term Incentive Plans (Detail)	Sep. 30, 2021shares
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total shares reserved	878,343
Target
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total shares reserved	504,590
2019 LTIP [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total shares reserved	295,325
2019 LTIP [Member] | Share Price On Grant Date
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total shares reserved	5.27
2019 LTIP [Member] | Target
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total shares reserved	171,437
2020 LTIP [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total shares reserved	254,256
2020 LTIP [Member] | Share Price On Grant Date
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total shares reserved	8.70
2020 LTIP [Member] | Target
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total shares reserved	145,289
2021 LTIP [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total shares reserved	328,762
2021 LTIP [Member] | Share Price On Grant Date
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total shares reserved	8.15
2021 LTIP [Member] | Target
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total shares reserved	187,864

Stock-Based Compensation - Empl

Stock-Based Compensation - Employee Stock Purchase Plan ("ESPP") - Additional Information (Detail) - Employee Stock Purchase Plan [Member]	9 Months Ended
	Sep. 30, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of fair market value to determine purchase price	85.00%
Offering period	6 months
Rate of discount on fair market value of common stock under ESPP	15.00%

Stock-Based Compensation - Calc

Stock-Based Compensation - Calculation of Fair Value of Each Employee Stock Purchase Grant Using the Black-Scholes Option-Pricing Model (Detail) - Employee Stock Purchase Plan [Member]	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Calculation of fair value of each employee stock purchase grant using the Black-Scholes option-pricing model
Dividend yield	3.10%	4.10%
Risk-free interest rate	0.10%	0.10%
Expected volatility	48.00%	44.00%
Expected life (in years)	6 months	6 months

Stock-Based Compensation - Boar

Stock-Based Compensation - Board of Director Equity Awards - Additional Information (Detail) - USD ($) $ in Millions	May 31, 2021	Sep. 30, 2021	Sep. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted shares vested intrinsic value		$ 2.2	$ 1.9
New Directors [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period		3 years
Board of Directors [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period		1 year
Common stock issued	61,186
Shares vested, Shares		49,652
Restricted shares vested intrinsic value		$ 0.3

Stock-Based Compensation - Su_8

Stock-Based Compensation - Summary of Director Awards Activity (Detail) - Board of Directors [Member]	9 Months Ended
	Sep. 30, 2021$ / sharesshares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Outstanding, Beginning balance, Shares | shares	2,416
Options Outstanding, Granted | shares	61,186
Shares vested, Shares | shares	(52,068)
Options Outstanding, Ending balance, Shares | shares	11,534
Weighted Average Exercise Price, Beginning balance | $ / shares	$ 6.90
Shares awarded, Weighted Average Fair Value | $ / shares	6.57
Shares vested, Weighted Average Fair Value | $ / shares	6.65
Weighted Average Exercise Price, Ending balance | $ / shares	$ 6.57

Stock-Based Compensation - Em_2

Stock-Based Compensation - Employee Withholding Taxes on Stock Awards - Additional Information (Detail) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Payment of withholding taxes related to stock awards	$ 782	$ 1,108
Employee Withholding Taxes on Stock Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Payment of withholding taxes related to stock awards	$ 800	$ 1,100

Stock-Based Compensation - St_3

Stock-Based Compensation - Stock Repurchases - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended			9 Months Ended		11 Months Ended
	Sep. 30, 2021	Dec. 31, 2020	Mar. 31, 2020	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Nov. 04, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Repurchase Program Number Of Shares Repurchased		288,573,000	375,046	495,144,000
Expenses related to repurchase of shares		$ 1,800	$ 2,000	$ 3,193	$ 2,000
Stock repurchase average price		$ 6.30	$ 5.36	$ 6.45
Stock repurchase program, authorized amount							$ 5,000
Stock repurchased value	$ 2,460			$ 3,193	$ 2,000	$ 5,000
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock repurchase program, authorized amount			$ 7,000

Stock-Based Compensation - Auth

Stock-Based Compensation - Authorized Shares - Additional Information (Detail) - shares	Sep. 30, 2021	Dec. 31, 2020	May 29, 2020
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Common stock, shares authorized	50,000,000	50,000,000	100,000,000

Benefit Plans - Additional Info

Benefit Plans - Additional Information (Detail) - Employee Benefit Plans [Member]	9 Months Ended
	Sep. 30, 2021
Defined Benefit Plan Disclosure [Line Items]
Maximum percentage of current compensation of employee to contribute in plan	15.00%
Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Employer matches employee contribution percentage	4.00%

Benefit Plans - Summary of Cont

Benefit Plans - Summary of Contributions to Retirement Plans (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Defined Benefit Plan Disclosure [Line Items]
Contribution to retirement plans	$ 299	$ 173	$ 862	$ 601
U.S. Employees [Member]
Defined Benefit Plan Disclosure [Line Items]
Contribution to retirement plans	184	164	540	560
Foreign Employees [Member]
Defined Benefit Plan Disclosure [Line Items]
Contribution to retirement plans	$ 115	$ 9	$ 322	$ 41

Commitments and Contingencies -

Commitments and Contingencies - Additional Information (Detail) $ in Thousands	Aug. 07, 2019	Sep. 30, 2021USD ($)	Dec. 31, 2020USD ($)Employee	Dec. 31, 2019USD ($)Employee	Sep. 30, 2020USD ($)
Commitments And Contingencies Disclosure [Line Items]
Restructuring and related activities initiation date	Aug. 7, 2019
Restructuring expenses		$ 59	$ 100	$ 500
Number of employees | Employee			12	84
Lease expiration month and year		2020-10
Refund liability		$ 218	$ 146
Warranties		272	285	$ 444	$ 250
Warranty Reserves [Member]
Commitments And Contingencies Disclosure [Line Items]
Refund liability		200	$ 100
Warranties		$ 300			$ 300
Warranty Reserves [Member] | Antenna [Member]
Commitments And Contingencies Disclosure [Line Items]
Repair and replacement warranty		5 years

Commitments and Contingencies_2

Commitments and Contingencies - Summary of Restructuring Activity (Detail) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020	Dec. 31, 2019
Restructuring Cost And Reserve [Line Items]
Beginning balance	$ 15
Restructuring expenses	59	$ 100	$ 500
Payments made	(74)
Ending balance	0	15
Severance [Member]
Restructuring Cost And Reserve [Line Items]
Beginning balance	0
Restructuring expenses	59
Payments made	(59)
Ending balance	0	0
Lease Termination [Member]
Restructuring Cost And Reserve [Line Items]
Beginning balance	15
Restructuring expenses	0
Payments made	(15)
Ending balance	$ 0	$ 15

Commitments and Contingencies_3

Commitments and Contingencies - Summary of Warranty Activity (Detail) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Valuation And Qualifying Accounts [Abstract]
Beginning balance	$ 285	$ 444
Provisions for warranties	64	9
Consumption of reserves	(77)	(203)
Ending balance	$ 272	$ 250

Leases - Components of Lease Co

Leases - Components of Lease Cost (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Leases [Abstract]
Operating lease costs	$ 121	$ 128	$ 333	$ 538
Short-term lease costs	41	50	123	77
Variable lease costs	5	0	9	2
Amortization of finance lease assets	18	18	53	59
Interest on finance lease liabilities	2	2	6	6
Total lease cost	$ 187	$ 198	$ 524	$ 682

Leases - Schedule of Future Min

Leases - Schedule of Future Minimum Lease Payments under Operating and Finance Leases (Detail) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Operating Leases
2021 (remaining three months)	$ 124
2022	655
2023	610
2024	581
2025	501
Thereafter	2,674
Total minimum payments required	5,145
Less: amount representing interest	998
Present value of net minimum lease payments	4,147
Less: current maturities of lease obligations	(456)	$ (269)
Long-term lease obligations	3,691	3,949
Finance Leases
2021 (remaining three months)	21
2022	66
2023	44
2024	33
2025	15
Thereafter	5
Total minimum payments required	184
Less: amount representing interest	12
Present value of net minimum lease payments	172
Less: current maturities of lease obligations	(68)	(68)
Long-term lease obligations	$ 104	$ 96

Leases - Summary of Weighted Av

Leases - Summary of Weighted Average Remaining Lease Terms and Discount Rates (Detail)	Sep. 30, 2021
Leases [Abstract]
Weighted-average remaining lease term - finance leases	3 years 1 month 6 days
Weighted-average remaining lease term - operating leases	8 years 8 months 12 days
Weighted-average discount rate - finance leases	3.90%
Weighted-average discount rate - operating leases	5.00%

Leases - Schedule of Supplement

Leases - Schedule of Supplemental Cash Flow Information Related to Leases (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Leases [Abstract]
Operating cash flows for operating leases	$ 160	$ 33	$ 413	$ 262
Operating cash flows from tenant improvement incentives from operating leases	0	0	0	(1,004)
Operating cash flows for finance leases	2	2	6	6
Financing cash flows for finance leases	$ 25	$ 18	$ 54	$ 59

Leases - Schedule of Classifica

Leases - Schedule of Classification of ROU Assets and Lease liabilities (Detail) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
ASSETS
Operating right-of-use assets	$ 2,307	$ 2,272
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]	us-gaap:OtherAssets	us-gaap:OtherAssets
Finance right-of-use assets	$ 167	$ 157
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]	us-gaap:OtherAssets	us-gaap:OtherAssets
Total leased assets	$ 2,474	$ 2,429
Current
Operating leases	$ 456	$ 269
Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration]	us-gaap:AccountsPayableAndAccruedLiabilitiesCurrent	us-gaap:AccountsPayableAndAccruedLiabilitiesCurrent
Finance leases	$ 68	$ 68
Finance Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration]	us-gaap:AccountsPayableAndAccruedLiabilitiesCurrent	us-gaap:AccountsPayableAndAccruedLiabilitiesCurrent
Noncurrent
Operating leases	$ 3,691	$ 3,949
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration]	Operating leases	Operating leases
Finance leases	$ 104	$ 96
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration]	Finance leases	Finance leases
Total lease liabilities	$ 4,319	$ 4,382

Leases - Additional Information

Leases - Additional Information (Detail) $ in Thousands	Apr. 30, 2021USD ($)ft²	Sep. 30, 2021USD ($)	Dec. 31, 2020USD ($)
Leases [Line Items]
Lease description		On March 5, 2020, PCTEL (Tianjin) Wireless Telecommunications Products, Co. Ltd., a wholly owned subsidiary of the Company (“PCTEL Tianjin”), entered into a letter agreement with Wang Zhuang Village Committee of Tianjin, China (the “Letter Agreement”), specifying the terms for extension of the lease of the premises on which PCTEL Tianjin currently conducts its manufacturing activities in Tianjin, China (the “Tianjin Lease”) to October 2022. The Letter Agreement did not, however, effect the lease extension. The Tianjin Lease expired on October 8, 2020 without extension.  On October 16, 2020, the Wang Zhuang Village Committee issued a notice informing PCTEL Tianjin that the Chinese Party Central Committee and the State Council are accelerating the layout optimization and transformation of the industrial park in which the leased premises is located, and accordingly leases and lease extensions for all premises in the industrial park have been suspended and rent collection has been postponed. The letter indicates that if the Tianjin Lease extension is subsequently approved, the rent for the period from October 9, 2020 to the date of the Tianjin Lease extension (the “Intervening Period”) will then be due and payable.  Based upon past practices and verbal assurances, the Company believes that PCTEL Tianjin will have at least 30 days to vacate the leased premises if required by the Wang Zhuang Village Committee to do so.  Under the Company’s transition plan, it expects to finish manufacturing in Tianjin by the end of December 2021 and will vacate the facility in the first half of 2022.  The Company will retain a small group of employees in Tianjin, China, and move into a new leased facility during the first quarter 2022.
ROU assets		$ 2,307	$ 2,272
Operating lease liability		$ 4,147
Smarteq Wireless Aktiebolag [Member]
Leases [Line Items]
ROU assets	$ 200
Operating lease liability	$ 200
Smarteq Wireless Aktiebolag [Member] | Engineering Sales And Administration
Leases [Line Items]
Area of lease | ft²	4,080
Lease expiration date	Jul. 31, 2023

Borrowings - Additional Informa

Borrowings - Additional Information (Detail) $ in Millions	Sep. 30, 2021USD ($)
Subordinated Borrowings [Abstract]
Loan period	5 years
Payment of principal loan amount	$ 0.1
Loan interest rate	0.57%
Loan maturity term	May 31, 2026
Loan amount due within one year	$ 2

Income Taxes - Additional Infor

Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Income Tax Disclosure [Line Items]
Income tax expense (benefit)	$ 5	$ 9	$ 17	$ 25
Statutory rate			21.00%	21.00%
Net deferred tax assets	15,300		$ 15,300		$ 12,900
Operating loss and credit carry forward, expiration period			The Company’s federal NOLs generated in 2018 and future periods will not expire, and the Company’s NOLs and credits generated as of December 31, 2017 have a finite life primarily based on the 20-year carry forward of federal net operating losses.
Net operating loss carry forward period			20 years
Domestic deferred tax assets ratable reversal pattern period			12 years
Gross unrecognized tax benefit	800		$ 800		800
Deferred payroll taxes	500		500
Smarteq Wireless Aktiebolag [Member]
Income Tax Disclosure [Line Items]
Net deferred tax assets	2,300		2,300
Domestic Tax Authority [Member]
Income Tax Disclosure [Line Items]
Net deferred tax assets	12,200		12,200		$ 12,200
Foreign [Member] | CHINA
Income Tax Disclosure [Line Items]
Net deferred tax assets	800		800
Foreign [Member] | Sweden
Income Tax Disclosure [Line Items]
Net deferred tax assets	$ 2,300		$ 2,300

Product Line and Geographic I_3

Product Line and Geographic Information - Result of Product Line Revenues and Gross Profits (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Results of operations by segments
Revenues	$ 22,411	$ 18,923	$ 61,799	$ 56,271
Gross Profit	$ 10,254	$ 9,575	$ 28,533	$ 27,311
Gross Profit %	45.80%	50.60%	46.20%	48.50%
Operating Segments [Member] | Antennas & Industrial IoT Devices [Member]
Results of operations by segments
Revenues	$ 16,686	$ 12,326	$ 43,971	$ 37,696
Gross Profit	$ 5,655	$ 4,336	$ 14,578	$ 13,228
Gross Profit %	33.90%	35.20%	33.20%	35.10%
Operating Segments [Member] | Test & Measurement Products [Member]
Results of operations by segments
Revenues	$ 5,921	$ 6,810	$ 18,540	$ 19,011
Gross Profit	$ 4,635	$ 5,203	$ 14,057	$ 14,109
Gross Profit %	78.30%	76.40%	75.80%	74.20%
Corporate, Non-Segment [Member]
Results of operations by segments
Revenues	$ (196)	$ (213)	$ (712)	$ (436)
Gross Profit	$ (36)	$ 36	$ (102)	$ (26)

Product Line and Geographic I_4

Product Line and Geographic Information - Customers Accounted Revenues by Geographic Location (Detail) - Sales [Member] - Geographic Concentration Risk [Member]	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Europe, Middle East, & Africa [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total Sales	23.00%	16.00%	23.00%	16.00%
Asia Pacific [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total Sales	9.00%	8.00%	8.00%	9.00%
Other Americas [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total Sales	3.00%	3.00%	4.00%	2.00%
Total Foreign Sales [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total Sales	35.00%	27.00%	35.00%	27.00%

Product Line and Geographic I_5

Product Line and Geographic Information - Schedule of Total Trade Accounts Receivable Represents Customer Accounted for 10% or More Percentage (Detail) - Accounts Receivable - Customer Concentration Risk	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Customer B
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk percentage	12.00%	10.00%
Customer C
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk percentage	3.00%	31.00%

Revenue from Contracts with C_2

Revenue from Contracts with Customers - Additional Information (Detail) - USD ($)	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Disaggregation Of Revenue [Line Items]
Order shipments, description	A majority of the Company’s revenue is short cycle in nature with shipments within one year from order.
Payment terms, description	The Company's payment terms generally range between 30 to 90 days.
Refund liability	$ 218,000		$ 146,000
Contract assets	0		0
Contract with customer liability, revenue recognized	700,000	$ 600,000
Accrued Liabilities [Member]
Disaggregation Of Revenue [Line Items]
Refund liability	200,000		100,000
Contract liability	500,000		400,000
Inventories [Member]
Disaggregation Of Revenue [Line Items]
Product return asset	$ 100,000		$ 100,000

Revenue from Contracts with C_3

Revenue from Contracts with Customers - Additional Information1 (Detail)	Sep. 30, 2021
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2020-07-01
Disaggregation Of Revenue [Line Items]
Period for performance obligation to provide software maintenance and support	1 year