PC Tel (PCTI) 10-Q 9 Aug 18 2018 Q2 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	6 Months Ended
	Jun. 30, 2018	Aug. 08, 2018
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2018
Document Fiscal Year Focus	2,018
Document Fiscal Period Focus	Q2
Trading Symbol	PCTI
Entity Registrant Name	PC TEL INC
Entity Central Index Key	1,057,083
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
Entity Common Stock, Shares Outstanding		18,314,311

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
ASSETS
Cash and cash equivalents	$ 7,603	$ 5,559
Short-term investment securities	28,904	32,499
Accounts receivable, net of allowances of $164 and $319 at June 30, 2018 and December 31, 2017, respectively	17,929	18,624
Inventories, net	13,470	12,756
Prepaid expenses and other assets	1,285	1,605
Total current assets	69,191	71,043
Property and equipment, net	12,844	12,369
Goodwill	3,332	3,332
Intangible assets, net	1,532	2,113
Deferred tax assets, net	8,213	7,734
Other noncurrent assets	58	72
TOTAL ASSETS	95,170	96,663
LIABILITIES AND STOCKHOLDERS’ EQUITY
Accounts payable	8,219	5,471
Accrued liabilities	5,413	7,481
Total current liabilities	13,632	12,952
Long-term liabilities	453	392
Total liabilities	14,085	13,344
Stockholders’ equity:
Common stock, $0.001 par value, 100,000,000 shares authorized, 18,318,141 and 17,806,792 shares issued and outstanding at June 30, 2018 and December 31, 2017, respectively	18	18
Additional paid-in capital	134,367	134,505
Accumulated deficit	(53,250)	(51,258)
Accumulated other comprehensive (loss) income	(50)	54
Total stockholders’ equity	81,085	83,319
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	$ 95,170	$ 96,663

Condensed Consolidated Balance3

Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Statement Of Financial Position [Abstract]
Allowance for accounts receivable	$ 164	$ 319
Common stock, par value	$ 0.001	$ 0.001
Common stock, shares authorized	100,000,000	100,000,000
Common stock, shares issued	18,318,141	17,806,792
Common stock, shares outstanding	18,318,141	17,806,792

Condensed Consolidated Statemen

Condensed Consolidated Statements of Operations (unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Income Statement [Abstract]
REVENUES	$ 21,582	$ 21,501	$ 43,313	$ 44,471
COST OF REVENUES	13,783	12,539	27,650	26,055
GROSS PROFIT	7,799	8,962	15,663	18,416
OPERATING EXPENSES:
Research and development	3,053	2,667	5,993	5,383
Sales and marketing	3,075	2,912	6,102	6,165
General and administrative	3,149	3,598	6,143	6,937
Amortization of intangible assets	124	124	248	248
Total operating expenses	9,401	9,301	18,486	18,733
OPERATING LOSS	(1,602)	(339)	(2,823)	(317)
Other income, net	209	14	260	42
LOSS BEFORE INCOME TAXES	(1,393)	(325)	(2,563)	(275)
Benefit for income taxes	(167)	(140)	(479)	(274)
LOSS FROM CONTINUING OPERATIONS	(1,226)	(185)	(2,084)	(1)
NET LOSS FROM DISCONTINUED OPERATIONS, NET OF TAX BENEFIT	0	(168)	0	(382)
NET LOSS	$ (1,226)	$ (353)	$ (2,084)	$ (383)
Net Loss per Share from Continuing Operations:
Basic	$ (0.07)	$ (0.01)	$ (0.12)	$ 0
Diluted	(0.07)	(0.01)	(0.12)	0
Net Loss per Share from Discontinued Operations:
Basic	0	(0.01)	0	(0.02)
Diluted	0	(0.01)	0	(0.02)
Net Loss per Share:
Basic	(0.07)	(0.02)	(0.12)	(0.02)
Diluted	$ (0.07)	$ (0.02)	$ (0.12)	$ (0.02)
Weighted Average Shares:
Basic	17,142	16,534	17,099	16,437
Diluted	17,142	16,534	17,099	16,437
Cash dividend per share	$ 0.055	$ 0.05	$ 0.11	$ 0.10

Condensed Consolidated Stateme5

Condensed Consolidated Statements of Comprehensive Loss (unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Statement Of Income And Comprehensive Income [Abstract]
NET LOSS	$ (1,226)	$ (353)	$ (2,084)	$ (383)
OTHER COMPREHENSIVE (LOSS) INCOME:
Foreign currency translation adjustments	(348)	105	(104)	156
COMPREHENSIVE LOSS	$ (1,574)	$ (248)	$ (2,188)	$ (227)

Condensed Consolidated Stateme6

Condensed Consolidated Statements of Stockholders' Equity (unaudited) - 6 months ended Jun. 30, 2018 - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid - In Capital [Member]	Retained Deficit [Member]	Accumulated Other Comprehensive Loss [Member]
BALANCE at beginning of year at Dec. 31, 2017	$ 83,319	$ 18	$ 134,505	$ (51,258)	$ 54
Cumulative-effect adjustment resulting from adoption of ASU 2016-16 at Dec. 31, 2017	92	0	0	92	0
BALANCE at beginning of year, as adjusted at Dec. 31, 2017	83,411	18	134,505	(51,166)	54
Stock-based compensation expense	1,786	0	1,786	0	0
Issuance of shares for stock purchase plans	364	0	364	0	0
Cancellation of shares for payment of withholding tax	(289)	0	(289)	0	0
Dividends paid	(1,999)	0	(1,999)	0	0
Net loss	(2,084)	0	0	(2,084)	0
Change in cumulative translation adjustment, net	(104)	0	0	0	(104)
BALANCE at end of year at Jun. 30, 2018	$ 81,085	$ 18	$ 134,367	$ (53,250)	$ (50)

Condensed Consolidated Stateme7

Condensed Consolidated Statements of Cash Flows (unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Operating Activities:
Net loss from continuing operations	$ (2,084)	$ (1)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation	1,381	1,262
Intangible asset amortization	581	581
Stock-based compensation	1,786	1,797
(Gain) loss on disposal of property and equipment	(5)	3
Restructuring costs	(20)	(58)
Bad debt provision	124	(7)
Deferred tax provision	(390)	(423)
Changes in operating assets and liabilities:
Accounts receivable	473	1,458
Inventories	(813)	779
Prepaid expenses and other assets	330	96
Accounts payable	2,743	(232)
Income taxes payable	(38)	(186)
Other accrued liabilities	(2,107)	(694)
Deferred revenue	16	20
Net cash provided by operating activities	1,977	4,395
Investing Activities:
Capital expenditures	(1,519)	(1,544)
Proceeds from disposal of property and equipment	14	0
Purchases of investments	(22,712)	(23,071)
Redemptions/maturities of short-term investments	26,307	19,187
Net cash provided by (used in) investing activities	2,090	(5,428)
Financing Activities:
Proceeds from issuance of common stock	364	867
Payment of withholding tax on stock-based compensation	(289)	(692)
Principle payments on capital leases	(57)	(41)
Cash dividends	(1,999)	(1,752)
Net cash used in financing activities	(1,981)	(1,618)
Cash flows from discontinued operations:
Net cash used in operating activities	0	(349)
Net cash used in investing activities	0	(16)
Net cash flows used in discontinued operations	0	(365)
Net increase (decrease) in cash and cash equivalents	2,086	(3,016)
Effect of exchange rate changes on cash	(42)	36
Cash and cash equivalents, beginning of period	5,559	14,855
Cash and Cash Equivalents, End of Period	$ 7,603	$ 11,875

Basis of Presentation

Basis of Presentation	6 Months Ended
	Jun. 30, 2018
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 U.S. 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 of the information and footnotes required by U.S. GAAP for complete financial statements. In the opinion of management, all adjustments (consisting of normal recurring accruals) considered necessary for a fair presentation have been included. For further information, refer to the audited consolidated financial statements and footnotes thereto included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2017 (the “2017 Form 10-K”). Nature of Operations PCTEL, Inc. (“PCTEL”, the “Company”, “we”, “ours”, and “us”) delivers P erformance C ritical TEL ecom technology solutions to the wireless industry. PCTEL is a rovides test tools to analyze, design, and optimize next generation wireless networks. Segment Reporting PCTEL operates in two segments for reporting purposes, Connected Solutions and RF Solutions. The Company’s chief operating decision maker uses operating profits and identified assets for the Connected Solutions and RF Solutions segments for resource allocations. Each segment has its own segment manager as well as its own engineering, business development, sales and marketing, and operational general and administrative functions. All of the Company’s accounting and finance, human resources, information technology (“IT”) and legal functions are provided on a centralized basis through the corporate function. The Company manages its balance sheet and cash flows centrally at the corporate level, with the exception of trade accounts receivable and inventory which is managed at the segment level. Each of the segment managers reports to and maintains regular contact with the chief operating decision maker to discuss operating activities, financial results, forecasts, and plans for the segment. Connected Solutions Segment PCTEL Connected Solutions designs and manufactures precision antennas. PCTEL antennas are deployed primarily in small cells, enterprise Wi-Fi access points, fleet management and transit systems, and in equipment and devices for the IIoT. Revenue growth in these markets is driven by the increased use of wireless communications and increased complexity occurring in these markets. PCTEL antennas are primarily sold to original equipment manufacturer (“OEM”) providers where they are designed into the customer’s solution. Competition in the antenna markets addressed by the Connected Solutions segment is fragmented. Competitors include Airgain, Amphenol, Laird, Pulse, and Taoglas. The Company seeks out product applications that command a premium for product performance and customer service, and it avoids commodity markets. PCTEL maintains expertise in several technology areas in order to be competitive in the antenna market. These include radio frequency engineering, mobile antenna design and manufacturing, mechanical engineering, product quality and testing, and wireless network engineering. RF Solutions Segment PCTEL RF Solutions p rovides test tools to analyze, design, and optimize their networks. Revenue growth is driven by the implementation and roll out of new wireless technology standards (i.e. 3G to 4G, 4G to 5G). PCTEL test equipment is sold directly to wireless carriers or to Competitors for PCTEL’s test tool products include OEMs such as Anritsu, Berkley Varitronics, Digital Receiver Technology, and Rohde and Schwarz. PCTEL maintains expertise in several technology areas in order to be competitive in the test tool market. These include radio frequency engineering, digital signal process engineering, manufacturing, mechanical engineering, product quality and testing, and wireless network engineering . During the quarter ended June 30, 2017, the Company approved a plan to sell its Network Engineering Services business (“Engineering Services”) and shift its focus to research and development driven radio frequency (“RF”) products. On July 31, 2017, the Company sold substantially all of the assets of the Company’s Engineering Services business to Gabe’s Construction Co., Inc. (“Gabe’s”) for a purchase price of $1.45 million. The Engineering Services business provided design, testing, commissioning, optimization, and consulting services for cellular, Wi-Fi and public safety networks and was a reporting unit within the RF Solutions segment. The disposition of Engineering Services qualified as a discontinued operation for reporting purposes due to the material significance of its historical results and because this disposition represented a strategic shift by the Company to focus on products. As such, the Company reported the results of its Engineering Services business as discontinued operations beginning with the quarter ended June 30, 2017. The Company restated the results of Engineering Services as discontinued operations for the three and six months ended June 30, 2017. See Note 5 for more information on discontinued operations. Basis of Consolidation The unaudited interim condensed consolidated financial statements of the Company include the condensed consolidated balance sheet and the condensed consolidated statement of stockholders’ equity as of June 30, 2018, and the condensed consolidated statements of operations, statements of comprehensive loss, and cash flows for the three and six months ended June 30, 2018 and 2017, 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, 2017 is derived from the audited financial statements as of December 31, 2017. Certain amounts in the prior year have been reclassified to conform to the current year presentation. 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 within the 2017 Form 10-K. There were no changes in the Company’s significant accounting policies during the six months ended June 30, 2018. See Note 13 related to Revenue from Contracts with Customers for additional disclosures related to revenue policies. In addition, the Company reaffirms the use of estimates in the preparation of the financial statements as set forth in the 2017 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 2017 Form 10-K. The results of operations for the period ended June 30, 2018 may not be indicative of the results for the period ending December 31, 2018. Foreign Operations The Company is exposed to foreign currency fluctuations due to its foreign operations and because products are sold internationally. The functional currency for the Company’s foreign operations is predominantly the applicable local currency. Accounts of foreign operations are translated into U.S. dollars using the exchange rate in effect at the applicable balance sheet date for assets and liabilities and average monthly rates prevailing during the period for revenue and expense accounts. Adjustments resulting from translation are included in accumulated other comprehensive loss, a separate component of stockholders’ equity. Gains and losses resulting from other transactions originally in foreign currencies and then translated into U.S. dollars are included in the condensed consolidated statement of operations. Net foreign exchange gains (losses) resulting from foreign currency transactions included in other income, net were $60 and $(41) for the three months ended June 30, 2018 and 2017, respectively. Net foreign exchange (losses) resulting from foreign currency transactions included in other income, net were $(9) and $(53) for the six months ended June 30, 2018 and 2017, respectively. Recent Accounting Pronouncements In June 2016, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update No. 2016-13 (“ASU 2016-13”) regarding ASC Topic 326, “Financial Instruments - Credit Losses,” which modifies the measurement of expected credit losses of certain financial instruments. The amendments will be effective for the Company on January 1, 2020. The Company is currently evaluating this guidance and the impact it will have on its consolidated financial statements. In February 2016, the FASB issued ASU 2016-02, Leases (“Topic 842”), which amends existing guidance to require lessees to recognize assets and liabilities on the balance sheet for the rights and obligations created by long-term leases and to disclose additional quantitative and qualitative information about leasing arrangements. Topic 842 also provides clarifications surrounding the presentation of the effects of leases in the income statement and statement of cash flows. This guidance will be effective for the Company on January 1, 2019. The Company is currently evaluating key policy elections and considerations prompted by the standard and will draft an internal policy to address the new standard requirements. The Company has developed a project plan to implement Topic 842. The Company is in the process of preparing the complete portfolio of active leases, including embedded leases. The Company is in process of evaluating the impact of the new lease accounting guidance on its consolidated financial statements and related disclosures. In August 2016, the FASB issued ASU 2016-15 , In October 2016, the FASB issued ASU 2016-16, Income Taxes (“Topic 740”): Intra-Entity Transfer of Assets Other than Inventory. Topic 740 requires an entity to recognize the income tax consequences of an intra-entity transfer of an asset other than inventory when the transfer occurs. The Company adopted Topic 740 on January 1, 2018 using the modified retrospective approach, and as a result recorded a deferred tax asset with a corresponding adjustment to retained earnings of $0.1 million associated with an inter-entity transfer of goodwill in 2009. The goodwill was transferred to the U.S. entity from a Canadian entity that was dissolved in 2009. In May 2014, the FASB issued ASU 2014-09, “Revenue from Contracts with Customers” (“Topic 606”) which introduces a new revenue recognition model in which an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. Topic 606 defines a five-step process to achieve this core principle and, in doing so, more judgment and estimates may be required in connection with the revenue recognition process than were previously required under prior U.S. GAAP. Topic 606 also requires disclosures sufficient to enable users to understand the nature, amount, timing, and uncertainty of revenue and cash flows arising from contracts with customers, including qualitative and quantitative disclosures about contracts with customers, significant judgments and changes in judgments, and assets recognized from the costs to obtain or fulfill a contract. The FASB has also issued the following standards which clarify Topic 606 and have the same effective date as the original standard: ASU 2016-20, Technical Corrections and Improvements to Topic 606, ASU No. 2016-12, Narrow-Scope Improvements and Practical Expedients, ASU 2016-10, Identifying Performance Obligations and Licensing and ASU 2016-08, Principal versus Agent Considerations. The Company adopted Topic 606 on January 1, 2018 using the modified retrospective approach. The majority of the Company’s revenue is recognized on a “point-in-time” basis and a nominal amount of our revenue is recognized “over time” under the new standard, which is consistent with our revenue recognition policy under the previous guidance. There were no changes to retained earnings from the adoption of Topic 606. The Company made changes to incorporate the impact of the new standard into our policies, processes, and controls.

Fair Value of Financial Instrum

Fair Value of Financial Instruments	6 Months Ended
	Jun. 30, 2018
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 and other investments are financial assets with carrying values that approximate fair value due to the short-term nature of these assets. Accounts payable is a financial liability with a carrying value that approximates fair value due to the short-term nature of these liabilities.

Earnings per Share

Earnings per Share	6 Months Ended
	Jun. 30, 2018
Earnings Per Share [Abstract]
Earnings per Share	3. Earnings per Share The following table is the computation of basic and diluted earnings per share: Three Months Ended June 30, Six Months Ended June 30, 2018 2017 2018 2017 Basic Loss Per Share computation: Numerator: Net loss from continuing operations $ (1,226 ) $ (185 ) $ (2,084 ) $ (1 ) Net loss from discontinued operations $ 0 $ (168 ) $ 0 $ (382 ) Net loss $ (1,226 ) $ (353 ) $ (2,084 ) $ (383 ) Denominator: Common shares outstanding 17,142 16,534 17,099 16,437 Net Loss per common share - basic Net loss from continuing operations $ (0.07 ) $ (0.01 ) $ (0.12 ) $ 0.00 Net loss from discontinued operations $ 0.00 $ (0.01 ) $ 0.00 $ (0.02 ) Net loss $ (0.07 ) $ (0.02 ) $ (0.12 ) $ (0.02 ) Diluted Loss Per Share computation: Denominator: Common shares outstanding 17,142 16,534 17,099 16,437 Restricted shares subject to vesting * * * * Common stock option grants * * * * Total shares 17,142 16,534 17,099 16,437 Loss per common share - diluted Net loss from continuing operations $ (0.07 ) $ (0.01 ) $ (0.12 ) $ 0.00 Net loss from discontinued operations $ 0.00 $ (0.01 ) $ 0.00 $ (0.02 ) Net loss $ (0.07 ) $ (0.02 ) $ (0.12 ) $ (0.02 ) * As denoted by “*” in the table above, the weighted average common stock option grants and restricted shares of 412,000 and 600,000 for the three and six months ended June 30, 2018 and 481,000 and 483,000 for the three and six months ended June 30, 2017, respectively, were excluded from the calculations of diluted net loss per share since their effects are anti-dilutive.

Cash, Cash Equivalents and Inve

Cash, Cash Equivalents and Investments	6 Months Ended
	Jun. 30, 2018
Cash And Cash Equivalents [Abstract]
Cash, Cash Equivalents and Investments	4. Cash, Cash Equivalents and Investments The Company’s cash and investments consisted of the following: June 30, December 31, 2018 2017 Cash $ 2,772 $ 3,785 Cash equivalents 4,831 1,774 Short-term investments 28,904 32,499 Total $ 36,507 $ 38,058 Cash and Cash Equivalents At June 30, 2018 and December 31, 2017, cash and cash equivalents included bank balances and investments with original maturities less than 90 days. At June 30, 2018 and December 31, 2017, the Company’s cash equivalents were invested in highly liquid AAA rated money market funds that are required to comply with Rule 2a-7 of the Investment Company Act of 1940. Such funds utilize the amortized cost method of accounting, seek to maintain a constant $1.00 per share price, and are redeemable upon demand. The Company restricts its investments in AAA money market funds to those invested 100% in either short-term U.S. government agency securities or bank repurchase agreements collateralized by these same securities. The fair values of these money market funds are established through quoted prices in active markets for identical assets (Level 1 inputs). The Company’s cash in U.S. banks is insured by the Federal Deposit Insurance Corporation up to the insurable limit of $250. The Company had $1.5 million and $1.2 million of cash and cash equivalents in foreign bank accounts at June 30, 2018 and December 31, 2017, respectively. Included in such amounts are cash of $1.3 million and $1.0 million in China bank accounts at June 30, 2018 and December 31, 2017, respectively. As of June 30, 2018, the Company has no intentions of repatriating the cash in its foreign bank accounts in China. If the Company decides to repatriate the cash in the foreign bank accounts, it may experience difficulty in doing so in a timely manner. The Company may also be exposed to foreign currency fluctuations and taxes if it repatriates these funds. The Company’s cash in its foreign bank accounts is not insured. Investments At June 30, 2018, the Company’s short-term investments consisted of U.S. government agency bonds, AA or higher rated corporate bonds, and certificates of deposit. At December 31, 2017, the Company’s short-term investments consisted of pre-funded municipal bonds, U.S. government agency bonds, AA or higher rated corporate bonds, and certificates of deposit. All of the investments at June 30, 2018 and December 31, 2017 were classified as held-to-maturity. The income and principal from the pre-refunded municipal bonds were secured by an irrevocable trust of U.S. Treasury securities. The bonds have original maturities greater than 90 days and mature in less than one year. The Company’s bond investments are recorded at the purchase price and carried at amortized cost. Approximately 8% of the Company’s municipal bond investments were protected by bond default insurance at December 31, 2017. All of the municipal bonds matured during the quarter ended June 30, 2018. Cash equivalents and investments were as follows at June 30, 2018 and December 31, 2017: June 30, 2018 December 31, 2017 Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Total Cash equivalents: Corporate bonds $ 0 $ 300 $ 0 $ 300 $ 0 $ 1,350 $ 0 $ 1,350 US government agency bonds 0 826 0 826 0 249 0 249 Certificates of deposit 3,419 0 0 3,419 0 0 0 0 Money market funds 286 0 0 286 175 0 0 175 Total Cash Equivalents $ 3,705 $ 1,126 $ 0 $ 4,831 $ 175 $ 1,599 $ 0 $ 1,774 Investments: Corporate bonds 0 16,782 0 16,782 0 18,463 0 18,463 Pre-refunded municipal bonds 0 0 0 0 0 2,133 0 2,133 US government agency bonds 0 2,849 0 2,849 0 4,457 0 4,457 Certificates of deposit 9,273 0 0 9,273 7,446 0 0 7,446 Total Investments $ 9,273 $ 19,631 $ 0 $ 28,904 $ 7,446 $ 25,053 $ 0 $ 32,499 Cash and Investments - book value $ 12,978 $ 20,757 $ 0 $ 33,735 $ 7,621 $ 26,652 $ 0 $ 34,273 Cash and Investments - fair value $ 12,973 $ 20,734 $ 0 $ 33,707 $ 7,622 $ 26,617 $ 0 $ 34,239 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 unrealized losses of $28 and $34 at June 30, 2018 and December 31, 2017, respectively.

Discontinued Operations

Discontinued Operations	6 Months Ended
	Jun. 30, 2018
Discontinued Operations And Disposal Groups [Abstract]
Discontinued Operations	5. Discontinued Operations During the quarter ended June 30, 2017, the Company approved a plan to sell its Engineering Services business and shift its focus to research and development driven RF products. On July 31, 2017, the Company sold its Engineering Services business to Gabe’s. The Company filed a Form 8-K related to the disposition on August 4, 2017. The disposition met the requirements for classification as held for sale during the quarter ended June 30, 2017 because the disposition met all the criteria outlined in the accounting guidance. Due to the significance of the results during the years ended December 31, 2016, 2015, and 2014, and because this disposition represented a strategic shift by the Company to focus on products, the disposition of Engineering Services also qualified as a discontinued operation for reporting purposes. As such, the Company reported the results of its Engineering Services business as discontinued operations for the three and six months ended June 30, 2017. There were no activities related to discontinued operations during the three and six months ended June 30, 2018 other than transition services for billing one customer. The Company completed the transition for billing as of June 30, 2018. The Company sold the fixed assets and backlog of the Engineering Services business to Gabe’s for $1.45 million. At closing, the Company received $1.4 million, consisting of $1.3 million for the sale of the business and $0.1 million related to future services. The Company recorded a pre-tax book gain of $0.5 million in discontinued operations during the quarter ended September 30, 2017. The net pre-tax book gain included proceeds from the sale of assets minus the book value of the assets disposed as well as severance and related payroll benefits for terminated employees. The book value of the assets was $0.6 million at the date of closing. On August 1, 2017, the Company terminated 25 employees, and Gabe’s hired 11 of these employees. The severance and related benefits for the terminated employees who were not subsequently hired by Gabe’s was $0.2 million. The income tax gain was $0.3 million, which included the tax value of the fixed assets and the remaining tax value for intangible assets no longer being used by the Company as of the sale to Gabe’s. The Company retained working capital of approximately $0.5 million, including accounts receivable, accounts payable, and accrued liabilities. There was no impairment loss recorded on the disposal of the long-lived assets because the fair value of the assets less cost to sell was higher than the carrying value of the assets. The details of the discontinued operations within the Statement of Operations are as follows: Three Months Ended Six Months Ended June 30, 2017 June 30, 2017 Revenues $ 1,348 $ 3,357 Cost of revenues 1,411 3,559 Gross profit (63 ) (202 ) Operating expenses: Sales and marketing 194 348 General and administrative 13 26 Restructuring expenses (1 ) 8 Total operating expenses 206 382 Operating loss (269 ) (584 ) Benefit for income taxes (101 ) (202 ) Net loss $ (168 ) $ (382 ) All the revenues and cost of revenues in discontinued operations related to services provided by the Company. The details of the cash flows for discontinued operations are as follows: . Six Months Ended June 30, 2017 Cash flows from discontinued operations: Operating Activities: Net loss $ (382 ) Depreciation 197 Deferred tax provision (202 ) Stock compensation 49 Prepaid expenses and other assets (11 ) Net cash used in operating activities $ (349 ) Investing Activities: Capital expenditures $ (16 ) Net cash used in investing activities $ (16 ) Net cash flows used in discontinued operations: $ (365 )

Goodwill and Intangible Assets

Goodwill and Intangible Assets	6 Months Ended
	Jun. 30, 2018
Goodwill And Intangible Assets Disclosure [Abstract]
Goodwill and Intangible Assets	6. Goodwill and Intangible Assets Goodwill There were no changes to goodwill during the three and six months ended June 30, 2018. The $3.3 million of goodwill on the balance sheet relates to the RF Solutions segment. There were no triggering events for the RF Solutions segment during the quarter ended June 30, 2018. The Company will continue to monitor goodwill for impairment going forward. Intangible Assets The Company amortizes intangible assets with finite lives on a straight-line basis over the estimated useful lives, which range from one to six years. Amortization expense was approximately $0.3 million for the three months ended June 30, 2018 and 2017, respectively, and $0.6 million for the six months ended June 30, 2018 and 2017, respectively. Amortization for technology assets is included in cost of revenues and amortization for all other intangible assets is included in operating expenses. For the three months ended June 30, 2018 and 2017, $0.1 million of the intangible asset amortization was included in operating expenses and $0.3 million of the intangible asset amortization was included in operating expenses and The summary of other intangible assets, net is as follows: June 30, 2018 December 31, 2017 Accumulated Net Book Accumulated Net Book Cost Amortization Value Cost Amortization Value Customer contracts and relationships $ 16,880 $ 16,880 $ 0 $ 16,880 $ 16,880 $ 0 Patents and technology 10,114 9,003 1,111 10,114 8,670 1,444 Trademarks and trade names 4,834 4,510 324 4,834 4,335 499 Other 2,506 2,409 97 2,506 2,336 170 Total $ 34,334 $ 32,802 $ 1,532 $ 34,334 $ 32,221 $ 2,113 The $0.6 million decrease in the net book value of intangible assets at June 30, 2018 compared to December 31, 2017 relates to amortization expense for the six months ended June 30, 2018. 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 to 6 years 5.1 Trademarks and trade names 5 to 6 years 5.6 Other 1 to 6 years 3.0 The Company’s intangible amortization is scheduled through February 2020. The amortization expense for 2018 and the next two years is as follows: Fiscal Year Amount 2018 $ 1,084 2019 $ 885 2020 $ 144

Balance Sheet Information

Balance Sheet Information	6 Months Ended
	Jun. 30, 2018
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Balance Sheet Information	7. 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 maintains an allowance for estimated uncollectible accounts receivable. The allowance is based on the Company’s assessment of known delinquent accounts, historical experience, and other currently available evidence of the collectability and the aging of accounts receivable. The Company’s allowance for doubtful accounts was $0.2 million and $0.3 million at June 30, 2018 and December 31, 2017, respectively. Inventories Inventories are stated at the lower of cost or market and include material, labor and overhead costs using the first-in, first-out method of costing. Inventories as of June 30, 2018 and December 31, 2017 were composed of raw materials, sub-assemblies, finished goods and work-in-process. The Company had consigned inventory with customers of $0.8 million and $0.5 million at June 30, 2018 and December 31, 2017, respectively. The Company records allowances to reduce the value of inventory to the lower of cost or market, including allowances for excess and obsolete inventory. Reserves for excess inventory are calculated based on our estimate of inventory in excess of normal and planned usage. Obsolete reserves are based on our identification of inventory where the carrying value is above net realizable value. The allowance for inventory losses was $3.0 million at June 30, 2018 and December 31, 2017. Inventories consisted of the following: June 30, 2018 December 31, 2017 Raw materials $ 7,333 $ 6,849 Work-in-process 1,260 962 Finished goods 4,877 4,945 Inventories, net $ 13,470 $ 12,756 Prepaid and Other Current 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 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: June 30, 2018 December 31, 2017 Building $ 6,351 $ 6,351 Computers and office equipment 11,379 10,873 Manufacturing and test equipment 13,846 13,012 Furniture and fixtures 1,368 1,288 Leasehold improvements 1,655 1,444 Motor vehicles 20 20 Total property and equipment 34,619 32,988 Less: Accumulated depreciation and amortization (23,545 ) (22,389 ) Land 1,770 1,770 Property and equipment, net $ 12,844 $ 12,369 Depreciation and amortization expense was approximately $0.7 million and $0.6 million for the three months ended June 30, 2018 and 2017, respectively. Depreciation and amortization expense was approximately $1.4 million and $1.3 million for the six months ended June 30, 2018 and 2017, respectively. Amortization for capital leases is included in depreciation and amortization expense. See Note 10 for information related to capital leases. Liabilities Accrued liabilities consisted of the following: June 30, 2018 December 31, 2017 Inventory receipts $ 1,421 $ 1,730 Paid time off 1,116 1,011 Payroll, bonuses, and other employee benefits 869 2,780 Warranties 401 382 Employee stock purchase plan 354 314 Professional fees and contractors 251 155 Deferred revenues 204 189 Customer refunds for estimated returns 186 197 Income and sales taxes 117 243 Short-term obligations under capital leases 105 97 Real estate taxes 74 148 Other 315 235 Total $ 5,413 $ 7,481 Long-term liabilities consisted of the following: June 30, 2018 December 31, 2017 Capital leases $ 170 $ 180 Deferred rent 132 89 Other 151 123 Total $ 453 $ 392

Stock-Based Compensation

Stock-Based Compensation	6 Months Ended
	Jun. 30, 2018
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Stock-Based Compensation	8. Stock-Based Compensation The condensed consolidated statements of operations include $1.1 million of stock compensation expense for the three months ended June 30, 2018 and 2017, respectively. The condensed consolidated statements of operations include $1.8 million of stock compensation expense for the six months ended June 30, 2018 and 2017, respectively. T The stock-based compensation expense by type is as follows: Three Months Ended June 30, Six Months Ended June 30, 2018 2017 2018 2017 Service-based awards $ 1,102 $ 1,054 $ 1,674 $ 1,679 Equity awards for short-term incentive plan (41 ) 46 0 88 Stock option and employee purchase plans 57 (12 ) 112 30 Total continuing operations 1,118 1,088 1,786 1,797 Discontinued operations 0 28 0 49 Total $ 1,118 $ 1,116 $ 1,786 $ 1,846 Total stock-based compensation is reflected in the condensed consolidated statements of operations as follows: Three Months Ended June 30, Six Months Ended June 30, 2018 2017 2018 2017 Cost of revenues $ 92 $ 72 $ 180 $ 133 Research and development 159 119 297 266 Sales and marketing 157 127 288 246 General and administrative 710 770 1,021 1,152 Total continuing operations 1,118 1,088 1,786 1,797 Discontinued operations 0 28 0 49 Total $ 1,118 $ 1,116 $ 1,786 $ 1,846 Restricted Stock – Service Based The Company grants restricted shares as employee and director incentives. 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. These grants vest over various periods. During the first quarter 2018, the Company issued 420,977 service-based restricted stock awards to employees that vest in equal annual increments over three years. The following table summarizes service-based restricted stock activity for the six months ended June 30, 2018: Shares Weighted Average Fair Value Unvested Restricted Stock Awards - December 31, 2017 828,576 $ 5.66 Shares awarded 481,975 6.94 Shares vested (176,798 ) 6.42 Shares cancelled (1,500 ) 6.01 Unvested Restricted Stock Awards - June 30, 2018 1,132,253 $ 6.09 The intrinsic value of service-based restricted shares that vested during the three months ended June 30, 2017 was At June 30, 2018, total unrecognized compensation expense related to restricted stock was approximately $4.4 million to be recognized through 2021 over a weighted average period of 1.5 years. Restricted Stock Units – Service Based The Company grants 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 six months ended June 30, 2018: Shares Weighted Average Fair Value Unvested Restricted Stock Units - December 31, 2017 31,800 $ 5.47 Units awarded 5,500 7.05 Units vested/Shares awarded (4,087 ) 5.79 Units cancelled (75 ) 7.49 Unvested Restricted Stock Units - June 30, 2018 33,138 $ 5.68 The intrinsic value of service-based restricted stock units that vested and were issued as shares during the three months ended June 30, 2017 was $17. No service-based restricted stock units vested during the three months ended June 30, 2018. As of June 30, 2018, the unrecognized compensation expense related to the unvested portion of the Company’s restricted stock units was approximately $0.1 million, to be recognized through 2021 over a weighted average period of 1.2 years. Stock Options The Company grants stock options to purchase common stock as long-term incentives. The exercise price of the stock options is no less than the fair value of the Company’s stock on the grant date. The stock options have a seven-year life and generally vest over a period of four years, 25% after one year, and ratably on a monthly basis thereafter. Stock options may be exercised at any time prior to their expiration date or within ninety days of termination of employment, or such shorter time as may be provided in the related stock option agreement. A summary of the Company’s stock option activity for the six months ended June 30, 2018 is as follows: Options Outstanding Weighted Average Exercise Price Outstanding at December 31, 2017 470,484 $ 7.24 Options granted 2,000 6.98 Options forfeited (84 ) 7.31 Options cancelled/expired (21,216 ) 9.11 Outstanding at June 30, 2018 451,184 $ 7.15 Exercisable at June 30, 2018 440,285 $ 7.19 The range of exercise prices for options outstanding and exercisable at June 30, 2018, was $5.00 to $10.46. 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) Weighted- Average Exercise Price Number Exercisable Weighted Average Exercise Price $ 5.00 — $ 6.00 13,500 5.23 $ 5.05 5,739 $ 5.05 6.00 — 7.00 9,189 2.50 6.75 7,189 6.69 7.00 — 8.00 421,345 1.80 7.20 420,864 7.20 8.00 — 9.00 5,000 3.28 8.14 4,343 8.14 9.00 — 10.00 750 2.35 9.68 750 9.68 10.00 — 10.46 1,400 0.09 10.46 1,400 10.46 $ 5.00 — $ 10.46 451,184 1.93 $ 7.15 440,285 $ 7.19 The weighted average contractual life and intrinsic value of options outstanding and options exercisable at June 30, 2018, was the following: Weighted Average Contractual Life (years) Intrinsic Value Options Outstanding 1.93 $ 16 Options Exercisable 1.84 $ 7 The intrinsic value is based on the share price of $6.24 at June 30, 2018. There were 2,000 stock options granted during the six months ended June 30, 2018. The Company calculated the fair value of each option grant on the date of grant using the Black-Scholes option-pricing model based upon the following assumptions during the six months ended June 30, 2018: June 30, 2018 Dividend yield 3.2% Risk-free interest rate 2.4% Expected volatility 33% Expected life (in years) 3.7 The fair value of each stock option outstanding was estimated on the date of grant using the Black-Scholes option-pricing model. The Black-Scholes option-pricing model was developed for use in estimating the fair value of traded options, which have no vesting restrictions and are fully transferable. 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 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 expected volatility was based on a five-year historical period of the Company’s stock price. The expected life for options granted was based on historical data of employee exercise performance. The Company records expense based on the graded vesting method. As of June 30, 2018, the unrecognized compensation expense related to the unvested portion of the Company’s stock options was approximately $9, to be recognized through 2021 over a weighted average period of 1.3 years. Performance-based Equity Awards The Company had 110,500 unvested performance awards at June 30, 2018 and December 31, 2017, respectively. There was no activity related to performance awards during the six months ended June 30, 2018. As of June 30, 2018, the Company does not expect any of the outstanding performance awards to vest. Short-term incentive plan Incentive awards earned by certain executives and key managers under the Company’s 2018 short-term incentive plan (“STIP”) will be settled 50% in cash and 50% in shares of the Company’s stock for certain executives. The incentive awards for all other participants under the 2018 STIP will be 100% in cash. All incentive awards earned under the 2017 STIP were paid in cash. 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. The Company received proceeds of $0.4 million from the issuance of 68,212 shares under the ESPP in February 2018 and received proceeds of $0.3 million from the issuance of 72,218 shares under the ESPP in February 2017. 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 2018 2017 Dividend yield 3.2 % 3.8 % Risk-free interest rate 2.1 % 0.8 % Expected volatility 33 % 33 % 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 under the PCTEL, Inc. Stock Plan (the “Stock Plan”) to members of its Board of Directors an annual retainer for committee service in shares of the Company’s stock. These awards vest upon issuance. New directors receive a one-time grant that vests over three years. During the quarter ended June 30, 2018, the Company issued 60,988 shares of the Company’s stock with a fair value of $0.4 million. During the quarter ended June 30, 2017, the Company issued 52,786 shares of the Company’s stock with a fair value of $0.4 million. 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 and short-term incentive plan stock awards for the value of the statutory withholding taxes. For each individual 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 $0.3 million and $0.6 million during the six months ended June 30, 2018 and 2017, respectively.

Benefit Plans

Benefit Plans	6 Months Ended
	Jun. 30, 2018
Compensation And Retirement Disclosure [Abstract]
Benefit Plans	9. Benefit Plans Employee Benefit Plans The Company’s 401(k) plan covers all of the 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 were as follows: Three Months Ended June 30, Six Months Ended June 30, 2018 2017 2018 2017 PCTEL, Inc. 401(k) profit sharing plan - US employees $ 163 $ 175 $ 365 $ 360 Defined contribution plans - foreign employees 134 109 262 207 Total $ 297 $ 284 $ 627 $ 567

Commitments and Contingencies

Commitments and Contingencies	6 Months Ended
	Jun. 30, 2018
Commitments And Contingencies Disclosure [Abstract]
Commitments and Contingencies	10. Commitments and Contingencies Restructuring -Discontinued Operations During the first quarter 2016, the Company exited from its Colorado office in order to consolidate facility space and recorded restructuring expense for the remaining obligations under the lease, net of proceeds for a sublease. The Company signed a sublease for the office space in the second quarter 2017. In July 2017, the Engineering Services business was sold to Gabe’s Construction and the activity related to Engineering Services is reported as discontinued operations. The obligation for the Colorado lease was retained by the Company. See Note 5 for additional information related to discontinued operations. The following table summarizes the restructuring activity during the six months ended June 30, 2018 and the status of the reserves at June 30, 2018: Lease Terminations Balance at December 31, 2017 $ 116 Restructuring expense 0 Payments (18 ) Balance at June 30, 2018 $ 98 The restructuring liability is recorded on the balance sheet at June 30, 2018 and December 31, 2017 as follows: June 30, 2018 December 31, 2017 Accrued liabilities $ 37 $ 35 Long-term liabilities 61 81 Total $ 98 $ 116 Operating Leases The Company has operating leases for facilities through 2025 and office equipment through 2021. The future minimum rental payments as of June 30, 2018 are as follows: Year Amount 2018 $ 610 2019 1,127 2020 515 2021 145 2022 146 Thereafter 268 Future minimum lease payments $ 2,811 The rent expense under leases was $0.2 million and $0.3 million for the three months ended June 30, 2018, and 2017, respectively, and was $0.5 million for the six months ended June 30, 2018 and 2017, respectively. In August 2017, the Company executed a new seven-year lease for 5,977 square feet of office space in Akron, Ohio for wireless product development related to the Connected Solutions segment. The annual lease obligation pursuant to the lease agreement is approximately $0.1 million. The Company assumed occupancy of this office in March 2018. During the first quarter 2016, the Company vacated its Colorado office lease in order to consolidate facility space related to our Engineering Services reporting unit. In May 2017, the Company signed a sublease with a term through the lease termination date. The lease expires on October 31, 2020. See discussion related to the Colorado office in the restructuring section of this Note 10. Capital Leases The Company has capital leases for office equipment. The net book values for assets under capital leases were as follows: June 30, 2018 December 31, 2017 Cost $ 502 $ 453 Accumulated Depreciation (236 ) (195 ) Net Book Value $ 266 $ 258 The following table presents future minimum lease payments under capital leases together with the present value of the net minimum lease payments due in each year: Year Amount 2018 $ 57 2019 98 2020 61 2021 48 2022 23 Thereafter 7 Total minimum payments required 294 Less: amount representing interest 19 Present value of net minimum lease payments $ 275 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 at June 30, 2018 and December 31, 2017, 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 scanning receiver products. The Company’s warranty reserve is based on historical sales and costs of repair and replacement trends. The warranty reserve was $0.4 million at June 30, 2018 and June 30, 2017, respectively, and is included in other accrued liabilities in the accompanying condensed consolidated balance sheets. Six Months Ended June 30, 2018 2017 Beginning balance $ 382 $ 394 Provisions for warranties 65 74 Consumption of reserves (46 ) (47 ) Ending balance $ 401 $ 421

Income Taxes

Income Taxes	6 Months Ended
	Jun. 30, 2018
Income Tax Disclosure [Abstract]
Income Taxes	11. Income Taxes On December 22, 2017, the United States federal government enacted the Tax Cuts and Jobs Act (“Tax Act”), marking a change from a worldwide tax system to a modified territorial tax system in the United States. As part of this change, the Tax Act, provides for a transition tax on the accumulated unremitted foreign earnings and profits of foreign subsidiaries (“Transition Tax”), a reduction of the U.S. federal corporate income tax rate from 34% to 21%, and an indefinite carryforward of net operating losses (“NOLs”) incurred in 2018 and future periods. In response to the enactment of the Tax Act in late 2017, the SEC issued Staff Accounting Bulletin No. 118 (“SAB 118”) to address situations where the accounting is incomplete for certain income tax effects of the Tax Act at the time of issuance of an entity’s financial statements for the reporting period in which the Tax Act was enacted. Under SAB 118, a company may record provisional amounts during a measurement period for specific income tax effects of the Tax Act for which the accounting is incomplete, but a reasonable estimate can be determined, and when unable to determine a reasonable estimate for any income tax effects, report provisional amounts in the first reporting period in which a reasonable estimate can be determined. The measurement period should not extend beyond one year. To determine the amount of the Transition Tax, the Company must determine, in addition to other factors, the amount of post-1986 earnings and profits of relevant subsidiaries, as well as the amount of non-U.S. income taxes paid on such earnings. During the year ended December 31, 2017, the Company recorded provisional income tax expense of $0.6 million related to the deemed repatriation of the accumulated unremitted earnings and profits of the Company’s foreign subsidiaries. This provisional amount was based on information that was currently available, including estimated tax earnings and profits from foreign subsidiaries. While we were able to make a reasonable estimate of the impact of the reduction in the corporate rate, it may be affected by state treatment of the deemed repatriation of foreign profits and the Company’s Transition Tax. In order to complete the accounting for the effects of the Transition Tax in 2018, the Company is continuing to gather additional information including refining the calculation of earnings and profits of foreign subsidiaries and is continuing to monitor the guidance from the I.R.S., states, and other government agencies to more precisely compute the amount of the Transition Tax and the state income tax impact of the deemed distributions of the foreign earnings and profits. No adjustments were recorded related to the Transition Tax during the three and six months ended June 30, 2018. The analyses will continue throughout 2018 and is expected to be completed when the Company files its income tax returns in late 2018. The Tax Act also includes a provision designed to tax global intangible low taxed income (“GILTI”). Under the provision, a U.S. shareholder is required to include in gross income the amount of its GILTI, which is generally the net income of its controlled foreign corporations in excess of a 10% return on depreciable tangible assets after identification of other income subject to non-deferral rules. Under U.S. GAAP, the Company is allowed to make an accounting policy choice of either (1) treating taxes due on future U.S. inclusions in taxable income related to GILTI as a current-period expense when incurred (the "period cost method") or (2) factoring such amounts into the Company's measurement of its deferred taxes (the "deferred method"). Due to the complexity of the new GILTI tax rules and uncertainty of the application of the foreign tax credit rules in relation to GILTI, the Company is continuing to evaluate this provision of the Tax Act. However, the Company has included an estimate of the 2018 current GILTI impact in the annual effective tax rate for 2018. The amount included for GILTI does not have a significant impact on the Company’s tax provision for the three and six months ended June 30, 2018. The Company recorded an income tax benefit of $0.2 million and $0.5 million for the three and six months ended June 30, 2018, respectively. The benefit recorded for the three and six months ended June 30, 2018 differed from the statutory rate of 21% because the Company did not record income tax benefits for losses with finite lives and due to permanent differences. The Company recorded an income tax benefit of $0.1 and $0.3 million for the three and six months ended June 30, 2017, respectively. The net tax benefit for the three and six months ended June 30, 2017 differed from the statutory rate of 34% due to the combination of U.S. pretax losses and foreign pretax profits taxed at lower rates. The net tax benefit for the three and six months ended June 30, 2017 included income tax expense of $0.1 million related to tax deficiencies with restricted stock and stock options and $0.1 million income tax benefit related to previously unrecognized tax benefits for research credits. The Company had deferred tax assets net of deferred tax liabilities of $8.2 million and $7.7 million The Company’s net deferred tax assets consist of NOLs and credits as well as timing differences. 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 13 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 Company’s valuation allowance against its deferred tax assets was $5.4 million and $5.2 million at June 30, 2018 and December 31, 2017, respectively. For the deferred tax assets related to NOLs and credits, the Company believes that it is more likely than not that these deferred tax assets will not be realized based on the negative evidence of a cumulative three-year loss through June 30, 2018 and expiration of the NOLs. 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’s gross unrecognized tax benefit was $0.7 million at June 30, 2018 and at December 31, 2017. 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 2015 and subsequent periods. The Company’s U.S. state tax returns remain subject to examination for 2012 and subsequent periods. The Company’s foreign tax returns remain subject to examination for 2010 and subsequent periods.

Segment, Customer and Geographi

Segment, Customer and Geographic Information	6 Months Ended
	Jun. 30, 2018
Segment Reporting [Abstract]
Segment, Customer and Geographic Information	12. Segment, Customer and Geographic Information PCTEL operates in two segments for reporting purposes, Connected Solutions and RF Solutions. The Company’s chief operating decision maker uses operating profits and identified assets for the Connected Solutions and RF Solutions segments to make operating decisions. Each segment has its own segment manager as well as its own engineering, business development, sales and marketing, and operational general and administrative functions. All of the Company’s accounting and finance, human resources, IT and legal functions are provided on a centralized basis through the corporate function. The Company manages its balance sheet and cash flows centrally at the corporate level, with the exception of trade accounts receivable and inventory which are managed at the segment level. Each of the segment managers reports to and maintains regular contact with the chief operating decision maker to discuss operating activities, financial results, forecasts, or plans for the segment. The following tables are the segment operating profits and cash flow information for the three and six months ended June 30, 2018 and 2017, respectively, and the segment balance sheet information as of June 30, 2018 and December 31, 2017: Three Months Ended June 30, 2018 Connected Solutions RF Solutions Corporate Total REVENUES $ 17,478 $ 4,135 $ (31 ) $ 21,582 GROSS PROFIT $ 5,031 $ 2,755 $ 13 $ 7,799 OPERATING INCOME (LOSS) FOR CONTINUING OPERATIONS $ 1,530 $ (398 ) $ (2,734 ) $ (1,602 ) Depreciation $ 513 $ 135 $ 59 $ 707 Intangible amortization $ 39 $ 252 $ 0 $ 291 Capital expenditures $ 578 $ 55 $ 2 $ 635 Six Months Ended June 30, 2018 Connected Solutions RF Solutions Corporate Total REVENUES $ 35,243 $ 8,134 $ (64 ) $ 43,313 GROSS PROFIT $ 10,229 $ 5,426 $ 8 $ 15,663 OPERATING INCOME (LOSS) FOR CONTINUING OPERATIONS $ 3,134 $ (724 ) $ (5,233 ) $ (2,823 ) Depreciation $ 991 $ 271 $ 119 $ 1,381 Intangible amortization $ 78 $ 503 $ 0 $ 581 Capital expenditures $ 1,298 $ 162 $ 59 $ 1,519 As of June 30, 2018 Connected Solutions RF Solutions Corporate Total Accounts receivable $ 13,341 $ 4,588 $ 0 $ 17,929 Inventories $ 12,118 $ 1,352 $ 0 $ 13,470 Long-lived assets: Property and equipment, net $ 10,806 $ 1,201 $ 837 $ 12,844 Goodwill $ 0 $ 3,332 $ 0 $ 3,332 Intangible assets, net $ 0 $ 1,532 $ 0 $ 1,532 Deferred tax assets, net $ 0 $ 0 $ 8,213 $ 8,213 Other noncurrent assets $ 0 $ 0 $ 58 $ 58 Three Months Ended June 30, 2017 Connected Solutions RF Solutions Corporate Total REVENUES $ 16,866 $ 4,661 $ (26 ) $ 21,501 GROSS PROFIT 5,731 3,223 8 8,962 OPERATING INCOME (LOSS) FROM CONTINUING OPERATIONS $ 2,349 $ 411 $ (3,099 ) $ (339 ) Depreciation $ 425 $ 138 $ 71 $ 634 Intangible amortization $ 39 $ 252 $ 0 $ 291 Capital expenditures $ 334 $ 226 $ (66 ) $ 494 Six Months Ended June 30, 2017 Connected Solutions RF Solutions Corporate Total REVENUES $ 34,137 $ 10,418 $ (84 ) $ 44,471 GROSS PROFIT 11,135 7,270 11 18,416 OPERATING INCOME (LOSS) FROM CONTINUING OPERATIONS $ 4,095 $ 1,432 $ (5,844 ) $ (317 ) Depreciation $ 851 $ 279 $ 132 $ 1,262 Intangible amortization $ 78 $ 503 $ 0 $ 581 Capital expenditures $ 844 $ 298 $ 402 $ 1,544 As of December 31, 2017 Connected Solutions RF Solutions Corporate Total Accounts receivable $ 13,158 $ 5,466 $ 0 $ 18,624 Inventories $ 11,418 $ 1,338 $ 0 $ 12,756 Long-lived assets: Property and equipment, net $ 10,161 $ 1,300 $ 908 $ 12,369 Goodwill $ 0 $ 3,332 $ 0 $ 3,332 Intangible assets, net $ 78 $ 2,035 $ 0 $ 2,113 Deferred tax assets, net $ 0 $ 0 $ 7,734 $ 7,734 Other noncurrent assets $ 0 $ 0 $ 72 $ 72 The Company’s revenue to customers by geographic location, as a percent of total revenues, is as follows: Three Months Ended June 30, Six Months Ended June 30, Region 2018 2017 2018 2017 Asia Pacific 18% 17% 17% 20% Europe, Middle East, & Africa 11% 9% 10% 8% Other Americas 4% 6% 4% 5% Total Foreign sales 33% 32% 31% 33% The following table represents the customers that accounted for 10% or more of revenues during the three and six months ended June 30, 2018 and 2017. Three Months Ended June 30, Six Months Ended June 30, Revenues 2018 2017 2018 2017 Customer A 11% 10% 10% 9% The following table represents the customers that accounted for 10% or more of total trade accounts receivable at June 30, 2018 and December 31, 2017. Trade Accounts Receivable June 30, 2018 December 31, 2017 Customer A 11% 7% Customer B 4% 12%

Revenue from Contracts with Cus

Revenue from Contracts with Customers	6 Months Ended
	Jun. 30, 2018
Revenue From Contract With Customer [Abstract]
Revenue from Contracts with Customers	13. 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 has identified 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 antenna products and test tool 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 software test 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 at June 30, 2018 and December 31, 2017, respectively, and is included within accrued liabilities on the accompanying condensed consolidated balance sheets. The December 31, 2017 refund liability was reclassified from accounts receivable to accrued liabilities for consistency with the current year presentation. Additionally, the Company recorded an asset based on historical experience for the amount of product we expect to return to inventory as a result of the return, which is recorded in inventories in the condensed consolidated balance sheets. The product return asset was $0.1 million at June 30, 2018 and December 31, 2017. There were no contract assets at June 30, 2018 or December 31, 2017. The Company records contract liabilities for deferred revenue and customer prepayments. Contract liabilities are recorded in accrued liabilities in the condensed consolidated balance sheets. The contract liability was $0.3 million at June 30, 2018 and December 31, 2017. The Company recognized revenue of $0.1 million and $0.2 million during the three and six months ended June 30, 2018, respectively, related to contract liabilities at the beginning of the period.

Subsequent Events

Subsequent Events	6 Months Ended
	Jun. 30, 2018
Subsequent Events [Abstract]
Subsequent Events	14. 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. U.S. Tariffs Effective July 6, 2018, the Office of the United States Trade Representative (“USTR”) imposed duties of 25% on certain Chinese imports containing industrially significant technologies, including certain PCTEL antenna and antenna components. Tariffs have increased the cost of the Company’s products, adversely impacting the gross margin that the Company earns on sales of its products and making our products more expensive for customers. During the trailing twelve months ended June 30, 2018, $7.5 million of our customer revenues were based on products subject to the new tariffs. In July, we initiated a 20% upcharge to end customers of these products to recover the impact of the additional costs for these U.S. tariffs. The Company will continue to monitor and adjust prices as necessary and as market conditions permit. However, the Company does not know the price elasticity of the unit volume based on the price increase. Additional tariffs affecting other antennas and antenna components become effective on August 23, 2018. The Company is currently evaluating the impact of these additional tariffs. There were no other 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)	6 Months Ended
	Jun. 30, 2018
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Nature of Operations	Nature of Operations PCTEL, Inc. (“PCTEL”, the “Company”, “we”, “ours”, and “us”) delivers P erformance C ritical TEL ecom technology solutions to the wireless industry. PCTEL is a rovides test tools to analyze, design, and optimize next generation wireless networks.
Segment Reporting	Segment Reporting PCTEL operates in two segments for reporting purposes, Connected Solutions and RF Solutions. The Company’s chief operating decision maker uses operating profits and identified assets for the Connected Solutions and RF Solutions segments for resource allocations. Each segment has its own segment manager as well as its own engineering, business development, sales and marketing, and operational general and administrative functions. All of the Company’s accounting and finance, human resources, information technology (“IT”) and legal functions are provided on a centralized basis through the corporate function. The Company manages its balance sheet and cash flows centrally at the corporate level, with the exception of trade accounts receivable and inventory which is managed at the segment level. Each of the segment managers reports to and maintains regular contact with the chief operating decision maker to discuss operating activities, financial results, forecasts, and plans for the segment. Connected Solutions Segment PCTEL Connected Solutions designs and manufactures precision antennas. PCTEL antennas are deployed primarily in small cells, enterprise Wi-Fi access points, fleet management and transit systems, and in equipment and devices for the IIoT. Revenue growth in these markets is driven by the increased use of wireless communications and increased complexity occurring in these markets. PCTEL antennas are primarily sold to original equipment manufacturer (“OEM”) providers where they are designed into the customer’s solution. Competition in the antenna markets addressed by the Connected Solutions segment is fragmented. Competitors include Airgain, Amphenol, Laird, Pulse, and Taoglas. The Company seeks out product applications that command a premium for product performance and customer service, and it avoids commodity markets. PCTEL maintains expertise in several technology areas in order to be competitive in the antenna market. These include radio frequency engineering, mobile antenna design and manufacturing, mechanical engineering, product quality and testing, and wireless network engineering. RF Solutions Segment PCTEL RF Solutions p rovides test tools to analyze, design, and optimize their networks. Revenue growth is driven by the implementation and roll out of new wireless technology standards (i.e. 3G to 4G, 4G to 5G). PCTEL test equipment is sold directly to wireless carriers or to Competitors for PCTEL’s test tool products include OEMs such as Anritsu, Berkley Varitronics, Digital Receiver Technology, and Rohde and Schwarz. PCTEL maintains expertise in several technology areas in order to be competitive in the test tool market. These include radio frequency engineering, digital signal process engineering, manufacturing, mechanical engineering, product quality and testing, and wireless network engineering . During the quarter ended June 30, 2017, the Company approved a plan to sell its Network Engineering Services business (“Engineering Services”) and shift its focus to research and development driven radio frequency (“RF”) products. On July 31, 2017, the Company sold substantially all of the assets of the Company’s Engineering Services business to Gabe’s Construction Co., Inc. (“Gabe’s”) for a purchase price of $1.45 million. The Engineering Services business provided design, testing, commissioning, optimization, and consulting services for cellular, Wi-Fi and public safety networks and was a reporting unit within the RF Solutions segment. The disposition of Engineering Services qualified as a discontinued operation for reporting purposes due to the material significance of its historical results and because this disposition represented a strategic shift by the Company to focus on products. As such, the Company reported the results of its Engineering Services business as discontinued operations beginning with the quarter ended June 30, 2017. The Company restated the results of Engineering Services as discontinued operations for the three and six months ended June 30, 2017. See Note 5 for more information on discontinued operations.
Basis of Consolidation	Basis of Consolidation The unaudited interim condensed consolidated financial statements of the Company include the condensed consolidated balance sheet and the condensed consolidated statement of stockholders’ equity as of June 30, 2018, and the condensed consolidated statements of operations, statements of comprehensive loss, and cash flows for the three and six months ended June 30, 2018 and 2017, 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, 2017 is derived from the audited financial statements as of December 31, 2017. Certain amounts in the prior year have been reclassified to conform to the current year presentation. 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 within the 2017 Form 10-K. There were no changes in the Company’s significant accounting policies during the six months ended June 30, 2018. See Note 13 related to Revenue from Contracts with Customers for additional disclosures related to revenue policies. In addition, the Company reaffirms the use of estimates in the preparation of the financial statements as set forth in the 2017 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 2017 Form 10-K. The results of operations for the period ended June 30, 2018 may not be indicative of the results for the period ending December 31, 2018.
Foreign Operations	Foreign Operations The Company is exposed to foreign currency fluctuations due to its foreign operations and because products are sold internationally. The functional currency for the Company’s foreign operations is predominantly the applicable local currency. Accounts of foreign operations are translated into U.S. dollars using the exchange rate in effect at the applicable balance sheet date for assets and liabilities and average monthly rates prevailing during the period for revenue and expense accounts. Adjustments resulting from translation are included in accumulated other comprehensive loss, a separate component of stockholders’ equity. Gains and losses resulting from other transactions originally in foreign currencies and then translated into U.S. dollars are included in the condensed consolidated statement of operations. Net foreign exchange gains (losses) resulting from foreign currency transactions included in other income, net were $60 and $(41) for the three months ended June 30, 2018 and 2017, respectively. Net foreign exchange (losses) resulting from foreign currency transactions included in other income, net were $(9) and $(53) for the six months ended June 30, 2018 and 2017, respectively.
Recent Accounting Pronouncements	Recent Accounting Pronouncements In June 2016, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update No. 2016-13 (“ASU 2016-13”) regarding ASC Topic 326, “Financial Instruments - Credit Losses,” which modifies the measurement of expected credit losses of certain financial instruments. The amendments will be effective for the Company on January 1, 2020. The Company is currently evaluating this guidance and the impact it will have on its consolidated financial statements. In February 2016, the FASB issued ASU 2016-02, Leases (“Topic 842”), which amends existing guidance to require lessees to recognize assets and liabilities on the balance sheet for the rights and obligations created by long-term leases and to disclose additional quantitative and qualitative information about leasing arrangements. Topic 842 also provides clarifications surrounding the presentation of the effects of leases in the income statement and statement of cash flows. This guidance will be effective for the Company on January 1, 2019. The Company is currently evaluating key policy elections and considerations prompted by the standard and will draft an internal policy to address the new standard requirements. The Company has developed a project plan to implement Topic 842. The Company is in the process of preparing the complete portfolio of active leases, including embedded leases. The Company is in process of evaluating the impact of the new lease accounting guidance on its consolidated financial statements and related disclosures. In August 2016, the FASB issued ASU 2016-15 , In October 2016, the FASB issued ASU 2016-16, Income Taxes (“Topic 740”): Intra-Entity Transfer of Assets Other than Inventory. Topic 740 requires an entity to recognize the income tax consequences of an intra-entity transfer of an asset other than inventory when the transfer occurs. The Company adopted Topic 740 on January 1, 2018 using the modified retrospective approach, and as a result recorded a deferred tax asset with a corresponding adjustment to retained earnings of $0.1 million associated with an inter-entity transfer of goodwill in 2009. The goodwill was transferred to the U.S. entity from a Canadian entity that was dissolved in 2009. In May 2014, the FASB issued ASU 2014-09, “Revenue from Contracts with Customers” (“Topic 606”) which introduces a new revenue recognition model in which an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. Topic 606 defines a five-step process to achieve this core principle and, in doing so, more judgment and estimates may be required in connection with the revenue recognition process than were previously required under prior U.S. GAAP. Topic 606 also requires disclosures sufficient to enable users to understand the nature, amount, timing, and uncertainty of revenue and cash flows arising from contracts with customers, including qualitative and quantitative disclosures about contracts with customers, significant judgments and changes in judgments, and assets recognized from the costs to obtain or fulfill a contract. The FASB has also issued the following standards which clarify Topic 606 and have the same effective date as the original standard: ASU 2016-20, Technical Corrections and Improvements to Topic 606, ASU No. 2016-12, Narrow-Scope Improvements and Practical Expedients, ASU 2016-10, Identifying Performance Obligations and Licensing and ASU 2016-08, Principal versus Agent Considerations. The Company adopted Topic 606 on January 1, 2018 using the modified retrospective approach. The majority of the Company’s revenue is recognized on a “point-in-time” basis and a nominal amount of our revenue is recognized “over time” under the new standard, which is consistent with our revenue recognition policy under the previous guidance. There were no changes to retained earnings from the adoption of Topic 606. The Company made changes to incorporate the impact of the new standard into our policies, processes, and controls.

Earnings per Share (Tables)

Earnings per Share (Tables)	6 Months Ended
	Jun. 30, 2018
Earnings Per Share [Abstract]
Computation of Basic and Diluted Earnings Per Share	The following table is the computation of basic and diluted earnings per share: Three Months Ended June 30, Six Months Ended June 30, 2018 2017 2018 2017 Basic Loss Per Share computation: Numerator: Net loss from continuing operations $ (1,226 ) $ (185 ) $ (2,084 ) $ (1 ) Net loss from discontinued operations $ 0 $ (168 ) $ 0 $ (382 ) Net loss $ (1,226 ) $ (353 ) $ (2,084 ) $ (383 ) Denominator: Common shares outstanding 17,142 16,534 17,099 16,437 Net Loss per common share - basic Net loss from continuing operations $ (0.07 ) $ (0.01 ) $ (0.12 ) $ 0.00 Net loss from discontinued operations $ 0.00 $ (0.01 ) $ 0.00 $ (0.02 ) Net loss $ (0.07 ) $ (0.02 ) $ (0.12 ) $ (0.02 ) Diluted Loss Per Share computation: Denominator: Common shares outstanding 17,142 16,534 17,099 16,437 Restricted shares subject to vesting * * * * Common stock option grants * * * * Total shares 17,142 16,534 17,099 16,437 Loss per common share - diluted Net loss from continuing operations $ (0.07 ) $ (0.01 ) $ (0.12 ) $ 0.00 Net loss from discontinued operations $ 0.00 $ (0.01 ) $ 0.00 $ (0.02 ) Net loss $ (0.07 ) $ (0.02 ) $ (0.12 ) $ (0.02 ) * As denoted by “*” in the table above, the weighted average common stock option grants and restricted shares of 412,000 and 600,000 for the three and six months ended June 30, 2018 and 481,000 and 483,000 for the three and six months ended June 30, 2017, respectively, were excluded from the calculations of diluted net loss per share since their effects are anti-dilutive.

Cash, Cash Equivalents and In24

Cash, Cash Equivalents and Investments (Tables)	6 Months Ended
	Jun. 30, 2018
Cash And Cash Equivalents [Abstract]
Cash and Cash Equivalents and Investments	The Company’s cash and investments consisted of the following: June 30, December 31, 2018 2017 Cash $ 2,772 $ 3,785 Cash equivalents 4,831 1,774 Short-term investments 28,904 32,499 Total $ 36,507 $ 38,058
Cash Equivalents and Investments	Cash equivalents and investments were as follows at June 30, 2018 and December 31, 2017: June 30, 2018 December 31, 2017 Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Total Cash equivalents: Corporate bonds $ 0 $ 300 $ 0 $ 300 $ 0 $ 1,350 $ 0 $ 1,350 US government agency bonds 0 826 0 826 0 249 0 249 Certificates of deposit 3,419 0 0 3,419 0 0 0 0 Money market funds 286 0 0 286 175 0 0 175 Total Cash Equivalents $ 3,705 $ 1,126 $ 0 $ 4,831 $ 175 $ 1,599 $ 0 $ 1,774 Investments: Corporate bonds 0 16,782 0 16,782 0 18,463 0 18,463 Pre-refunded municipal bonds 0 0 0 0 0 2,133 0 2,133 US government agency bonds 0 2,849 0 2,849 0 4,457 0 4,457 Certificates of deposit 9,273 0 0 9,273 7,446 0 0 7,446 Total Investments $ 9,273 $ 19,631 $ 0 $ 28,904 $ 7,446 $ 25,053 $ 0 $ 32,499 Cash and Investments - book value $ 12,978 $ 20,757 $ 0 $ 33,735 $ 7,621 $ 26,652 $ 0 $ 34,273 Cash and Investments - fair value $ 12,973 $ 20,734 $ 0 $ 33,707 $ 7,622 $ 26,617 $ 0 $ 34,239

Discontinued Operations (Tables

Discontinued Operations (Tables)	6 Months Ended
	Jun. 30, 2018
Discontinued Operations And Disposal Groups [Abstract]
Schedule of Discontinued Operations within Statement of Operations	The details of the discontinued operations within the Statement of Operations are as follows: Three Months Ended Six Months Ended June 30, 2017 June 30, 2017 Revenues $ 1,348 $ 3,357 Cost of revenues 1,411 3,559 Gross profit (63 ) (202 ) Operating expenses: Sales and marketing 194 348 General and administrative 13 26 Restructuring expenses (1 ) 8 Total operating expenses 206 382 Operating loss (269 ) (584 ) Benefit for income taxes (101 ) (202 ) Net loss $ (168 ) $ (382 )
Schedule of Cash Flows for Discontinued Operations	The details of the cash flows for discontinued operations are as follows: . Six Months Ended June 30, 2017 Cash flows from discontinued operations: Operating Activities: Net loss $ (382 ) Depreciation 197 Deferred tax provision (202 ) Stock compensation 49 Prepaid expenses and other assets (11 ) Net cash used in operating activities $ (349 ) Investing Activities: Capital expenditures $ (16 ) Net cash used in investing activities $ (16 ) Net cash flows used in discontinued operations: $ (365 )

Goodwill and Other Intangible A

Goodwill and Other Intangible Assets (Tables)	6 Months Ended
	Jun. 30, 2018
Goodwill And Intangible Assets Disclosure [Abstract]
Summary of Other Intangible Assets	The summary of other intangible assets, net is as follows: June 30, 2018 December 31, 2017 Accumulated Net Book Accumulated Net Book Cost Amortization Value Cost Amortization Value Customer contracts and relationships $ 16,880 $ 16,880 $ 0 $ 16,880 $ 16,880 $ 0 Patents and technology 10,114 9,003 1,111 10,114 8,670 1,444 Trademarks and trade names 4,834 4,510 324 4,834 4,335 499 Other 2,506 2,409 97 2,506 2,336 170 Total $ 34,334 $ 32,802 $ 1,532 $ 34,334 $ 32,221 $ 2,113
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 to 6 years 5.1 Trademarks and trade names 5 to 6 years 5.6 Other 1 to 6 years 3.0
Schedule of Expected Amortization Expense	The Company’s intangible amortization is scheduled through February 2020. The amortization expense for 2018 and the next two years is as follows: Fiscal Year Amount 2018 $ 1,084 2019 $ 885 2020 $ 144

Balance Sheet Information (Tabl

Balance Sheet Information (Tables)	6 Months Ended
	Jun. 30, 2018
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Summary of Inventories	Inventories consisted of the following: June 30, 2018 December 31, 2017 Raw materials $ 7,333 $ 6,849 Work-in-process 1,260 962 Finished goods 4,877 4,945 Inventories, net $ 13,470 $ 12,756
Summary of Property and Equipment	Property and equipment consisted of the following: June 30, 2018 December 31, 2017 Building $ 6,351 $ 6,351 Computers and office equipment 11,379 10,873 Manufacturing and test equipment 13,846 13,012 Furniture and fixtures 1,368 1,288 Leasehold improvements 1,655 1,444 Motor vehicles 20 20 Total property and equipment 34,619 32,988 Less: Accumulated depreciation and amortization (23,545 ) (22,389 ) Land 1,770 1,770 Property and equipment, net $ 12,844 $ 12,369
Summary of Accrued Liabilities	Accrued liabilities consisted of the following: June 30, 2018 December 31, 2017 Inventory receipts $ 1,421 $ 1,730 Paid time off 1,116 1,011 Payroll, bonuses, and other employee benefits 869 2,780 Warranties 401 382 Employee stock purchase plan 354 314 Professional fees and contractors 251 155 Deferred revenues 204 189 Customer refunds for estimated returns 186 197 Income and sales taxes 117 243 Short-term obligations under capital leases 105 97 Real estate taxes 74 148 Other 315 235 Total $ 5,413 $ 7,481
Summary of Long-term Liabilities	Long-term liabilities consisted of the following: June 30, 2018 December 31, 2017 Capital leases $ 170 $ 180 Deferred rent 132 89 Other 151 123 Total $ 453 $ 392

Stock-Based Compensation (Table

Stock-Based Compensation (Tables)	6 Months Ended
	Jun. 30, 2018
Summary of Stock-Based Compensation Expense by Type	The stock-based compensation expense by type is as follows: Three Months Ended June 30, Six Months Ended June 30, 2018 2017 2018 2017 Service-based awards $ 1,102 $ 1,054 $ 1,674 $ 1,679 Equity awards for short-term incentive plan (41 ) 46 0 88 Stock option and employee purchase plans 57 (12 ) 112 30 Total continuing operations 1,118 1,088 1,786 1,797 Discontinued operations 0 28 0 49 Total $ 1,118 $ 1,116 $ 1,786 $ 1,846
Stock-Based Compensation	Total stock-based compensation is reflected in the condensed consolidated statements of operations as follows: Three Months Ended June 30, Six Months Ended June 30, 2018 2017 2018 2017 Cost of revenues $ 92 $ 72 $ 180 $ 133 Research and development 159 119 297 266 Sales and marketing 157 127 288 246 General and administrative 710 770 1,021 1,152 Total continuing operations 1,118 1,088 1,786 1,797 Discontinued operations 0 28 0 49 Total $ 1,118 $ 1,116 $ 1,786 $ 1,846
Summary of Stock Option Activity	A summary of the Company’s stock option activity for the six months ended June 30, 2018 is as follows: Options Outstanding Weighted Average Exercise Price Outstanding at December 31, 2017 470,484 $ 7.24 Options granted 2,000 6.98 Options forfeited (84 ) 7.31 Options cancelled/expired (21,216 ) 9.11 Outstanding at June 30, 2018 451,184 $ 7.15 Exercisable at June 30, 2018 440,285 $ 7.19
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) Weighted- Average Exercise Price Number Exercisable Weighted Average Exercise Price $ 5.00 — $ 6.00 13,500 5.23 $ 5.05 5,739 $ 5.05 6.00 — 7.00 9,189 2.50 6.75 7,189 6.69 7.00 — 8.00 421,345 1.80 7.20 420,864 7.20 8.00 — 9.00 5,000 3.28 8.14 4,343 8.14 9.00 — 10.00 750 2.35 9.68 750 9.68 10.00 — 10.46 1,400 0.09 10.46 1,400 10.46 $ 5.00 — $ 10.46 451,184 1.93 $ 7.15 440,285 $ 7.19
Weighted Average Contractual Life and Intrinsic Value of the Options Outstanding and Options Exercisable	The weighted average contractual life and intrinsic value of options outstanding and options exercisable at June 30, 2018, was the following: Weighted Average Contractual Life (years) Intrinsic Value Options Outstanding 1.93 $ 16 Options Exercisable 1.84 $ 7
Calculation of Fair Value of Each Option Grant Using Black-Scholes Option-Pricing Model	The Company calculated the fair value of each option grant on the date of grant using the Black-Scholes option-pricing model based upon the following assumptions during the six months ended June 30, 2018: June 30, 2018 Dividend yield 3.2% Risk-free interest rate 2.4% Expected volatility 33% Expected life (in years) 3.7
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 2018 2017 Dividend yield 3.2 % 3.8 % Risk-free interest rate 2.1 % 0.8 % Expected volatility 33 % 33 % Expected life (in years) 0.5 0.5
Restricted Stock [Member]
Summary of Service-based Restricted Stock Activity	The following table summarizes service-based restricted stock activity for the six months ended June 30, 2018: Shares Weighted Average Fair Value Unvested Restricted Stock Awards - December 31, 2017 828,576 $ 5.66 Shares awarded 481,975 6.94 Shares vested (176,798 ) 6.42 Shares cancelled (1,500 ) 6.01 Unvested Restricted Stock Awards - June 30, 2018 1,132,253 $ 6.09
Restricted Stock Units [Member]
Summary of Service-based Restricted Stock Activity	The following table summarizes the restricted stock unit activity during the six months ended June 30, 2018: Shares Weighted Average Fair Value Unvested Restricted Stock Units - December 31, 2017 31,800 $ 5.47 Units awarded 5,500 7.05 Units vested/Shares awarded (4,087 ) 5.79 Units cancelled (75 ) 7.49 Unvested Restricted Stock Units - June 30, 2018 33,138 $ 5.68

Benefit Plans (Tables)

Benefit Plans (Tables)	6 Months Ended
	Jun. 30, 2018
Compensation And Retirement Disclosure [Abstract]
Summary of Contributions to Retirement Plans	The Company’s contributions to retirement plans were as follows: Three Months Ended June 30, Six Months Ended June 30, 2018 2017 2018 2017 PCTEL, Inc. 401(k) profit sharing plan - US employees $ 163 $ 175 $ 365 $ 360 Defined contribution plans - foreign employees 134 109 262 207 Total $ 297 $ 284 $ 627 $ 567

Commitments and Contingencies (

Commitments and Contingencies (Tables)	6 Months Ended
	Jun. 30, 2018
Commitments And Contingencies Disclosure [Abstract]
Summary of Restructuring Activity	The following table summarizes the restructuring activity during the six months ended June 30, 2018 and the status of the reserves at June 30, 2018: Lease Terminations Balance at December 31, 2017 $ 116 Restructuring expense 0 Payments (18 ) Balance at June 30, 2018 $ 98
Schedule of Restructuring Liability Recorded	The restructuring liability is recorded on the balance sheet at June 30, 2018 and December 31, 2017 as follows: June 30, 2018 December 31, 2017 Accrued liabilities $ 37 $ 35 Long-term liabilities 61 81 Total $ 98 $ 116
Future Minimum Rental Payments Under Operating Leases	The future minimum rental payments as of June 30, 2018 are as follows: Year Amount 2018 $ 610 2019 1,127 2020 515 2021 145 2022 146 Thereafter 268 Future minimum lease payments $ 2,811
Summary of Capital Leases for Office Equipment	The Company has capital leases for office equipment. The net book values for assets under capital leases were as follows: June 30, 2018 December 31, 2017 Cost $ 502 $ 453 Accumulated Depreciation (236 ) (195 ) Net Book Value $ 266 $ 258
Present Value of Net Minimum Lease Payments, Capital Leases	The following table presents future minimum lease payments under capital leases together with the present value of the net minimum lease payments due in each year: Year Amount 2018 $ 57 2019 98 2020 61 2021 48 2022 23 Thereafter 7 Total minimum payments required 294 Less: amount representing interest 19 Present value of net minimum lease payments $ 275
Changes in Warranty Reserves	Six Months Ended June 30, 2018 2017 Beginning balance $ 382 $ 394 Provisions for warranties 65 74 Consumption of reserves (46 ) (47 ) Ending balance $ 401 $ 421

Segment, Customer and Geograp31

Segment, Customer and Geographic Information (Tables)	6 Months Ended
	Jun. 30, 2018
Result of Operations by Segments	The following tables are the segment operating profits and cash flow information for the three and six months ended June 30, 2018 and 2017, respectively, and the segment balance sheet information as of June 30, 2018 and December 31, 2017: Three Months Ended June 30, 2018 Connected Solutions RF Solutions Corporate Total REVENUES $ 17,478 $ 4,135 $ (31 ) $ 21,582 GROSS PROFIT $ 5,031 $ 2,755 $ 13 $ 7,799 OPERATING INCOME (LOSS) FOR CONTINUING OPERATIONS $ 1,530 $ (398 ) $ (2,734 ) $ (1,602 ) Depreciation $ 513 $ 135 $ 59 $ 707 Intangible amortization $ 39 $ 252 $ 0 $ 291 Capital expenditures $ 578 $ 55 $ 2 $ 635 Six Months Ended June 30, 2018 Connected Solutions RF Solutions Corporate Total REVENUES $ 35,243 $ 8,134 $ (64 ) $ 43,313 GROSS PROFIT $ 10,229 $ 5,426 $ 8 $ 15,663 OPERATING INCOME (LOSS) FOR CONTINUING OPERATIONS $ 3,134 $ (724 ) $ (5,233 ) $ (2,823 ) Depreciation $ 991 $ 271 $ 119 $ 1,381 Intangible amortization $ 78 $ 503 $ 0 $ 581 Capital expenditures $ 1,298 $ 162 $ 59 $ 1,519 Three Months Ended June 30, 2017 Connected Solutions RF Solutions Corporate Total REVENUES $ 16,866 $ 4,661 $ (26 ) $ 21,501 GROSS PROFIT 5,731 3,223 8 8,962 OPERATING INCOME (LOSS) FROM CONTINUING OPERATIONS $ 2,349 $ 411 $ (3,099 ) $ (339 ) Depreciation $ 425 $ 138 $ 71 $ 634 Intangible amortization $ 39 $ 252 $ 0 $ 291 Capital expenditures $ 334 $ 226 $ (66 ) $ 494 Six Months Ended June 30, 2017 Connected Solutions RF Solutions Corporate Total REVENUES $ 34,137 $ 10,418 $ (84 ) $ 44,471 GROSS PROFIT 11,135 7,270 11 18,416 OPERATING INCOME (LOSS) FROM CONTINUING OPERATIONS $ 4,095 $ 1,432 $ (5,844 ) $ (317 ) Depreciation $ 851 $ 279 $ 132 $ 1,262 Intangible amortization $ 78 $ 503 $ 0 $ 581 Capital expenditures $ 844 $ 298 $ 402 $ 1,544
Assets by Segment	The following tables are the segment operating profits and cash flow information for the three and six months ended June 30, 2018 and 2017, respectively, and the segment balance sheet information as of June 30, 2018 and December 31, 2017: As of June 30, 2018 Connected Solutions RF Solutions Corporate Total Accounts receivable $ 13,341 $ 4,588 $ 0 $ 17,929 Inventories $ 12,118 $ 1,352 $ 0 $ 13,470 Long-lived assets: Property and equipment, net $ 10,806 $ 1,201 $ 837 $ 12,844 Goodwill $ 0 $ 3,332 $ 0 $ 3,332 Intangible assets, net $ 0 $ 1,532 $ 0 $ 1,532 Deferred tax assets, net $ 0 $ 0 $ 8,213 $ 8,213 Other noncurrent assets $ 0 $ 0 $ 58 $ 58 As of December 31, 2017 Connected Solutions RF Solutions Corporate Total Accounts receivable $ 13,158 $ 5,466 $ 0 $ 18,624 Inventories $ 11,418 $ 1,338 $ 0 $ 12,756 Long-lived assets: Property and equipment, net $ 10,161 $ 1,300 $ 908 $ 12,369 Goodwill $ 0 $ 3,332 $ 0 $ 3,332 Intangible assets, net $ 78 $ 2,035 $ 0 $ 2,113 Deferred tax assets, net $ 0 $ 0 $ 7,734 $ 7,734 Other noncurrent assets $ 0 $ 0 $ 72 $ 72
Customer Accounted Revenues by Geographic Location	The Company’s revenue to customers by geographic location, as a percent of total revenues, is as follows: Three Months Ended June 30, Six Months Ended June 30, Region 2018 2017 2018 2017 Asia Pacific 18% 17% 17% 20% Europe, Middle East, & Africa 11% 9% 10% 8% Other Americas 4% 6% 4% 5% Total Foreign sales 33% 32% 31% 33%
Sales [Member]
Schedule of Revenues and Total Trade Accounts Receivable Represents Customer Accounted for 10% or More Percentage	The following table represents the customers that accounted for 10% or more of revenues during the three and six months ended June 30, 2018 and 2017. Three Months Ended June 30, Six Months Ended June 30, Revenues 2018 2017 2018 2017 Customer A 11% 10% 10% 9%
Trade Accounts Receivable [Member]
Schedule of Revenues and Total Trade Accounts Receivable Represents Customer Accounted for 10% or More Percentage	The following table represents the customers that accounted for 10% or more of total trade accounts receivable at June 30, 2018 and December 31, 2017. Trade Accounts Receivable June 30, 2018 December 31, 2017 Customer A 11% 7% Customer B 4% 12%

Basis of Presentation - Additio

Basis of Presentation - Additional Information (Detail)	Jul. 31, 2017USD ($)	Jun. 30, 2018USD ($)	Jun. 30, 2017USD ($)	Jun. 30, 2018USD ($)Segment	Jun. 30, 2017USD ($)	Jan. 01, 2018USD ($)	Dec. 31, 2017USD ($)
Nature Of Operations [Line Items]
Number of operating segments | Segment				2
Net foreign exchange gains (losses) resulting from foreign currency transactions included in other income		$ 60,000	$ (41,000)	$ (9,000)	$ (53,000)
Adjustment to retained earnings						$ 100,000	$ 92,000
Retained Earnings [Member]
Nature Of Operations [Line Items]
Adjustment to retained earnings							$ 92,000
Retained Earnings [Member] | ASU 2014-09 [Member] | Adoption of Topic 606 [Member]
Nature Of Operations [Line Items]
Changes to retained earnings		$ 0		$ 0
Engineering Services [Member]
Nature Of Operations [Line Items]
Proceeds from sale of business	$ 1,450,000

Earnings per Share - Computatio

Earnings per Share - Computation of Basic and Diluted Earnings Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Numerator:
Net loss from continuing operations	$ (1,226)	$ (185)	$ (2,084)	$ (1)
Net loss from discontinued operations	0	(168)	0	(382)
NET LOSS	$ (1,226)	$ (353)	$ (2,084)	$ (383)
Denominator:
Common shares outstanding	17,142	16,534	17,099	16,437
Net Loss per common share - basic
Net loss from continuing operations	$ (0.07)	$ (0.01)	$ (0.12)	$ 0
Net loss from discontinued operations	0	(0.01)	0	(0.02)
Net loss	$ (0.07)	$ (0.02)	$ (0.12)	$ (0.02)
Denominator:
Common shares outstanding	17,142	16,534	17,099	16,437
Total shares	17,142	16,534	17,099	16,437
Loss per common share - diluted
Net loss from continuing operations	$ (0.07)	$ (0.01)	$ (0.12)	$ 0
Net loss from discontinued operations	0	(0.01)	0	(0.02)
Net loss	$ (0.07)	$ (0.02)	$ (0.12)	$ (0.02)

Earnings per Share - Computat34

Earnings per Share - Computation of Basic and Diluted Earnings Per Share (Parenthetical) (Detail) - shares	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Earnings Per Share [Abstract]
Antidilutive shares excluded	412,000	481,000	600,000	483,000

Cash, Cash Equivalents and In35

Cash, Cash Equivalents and Investments - Cash and Cash Equivalents and Investments (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Cash And Cash Equivalents [Abstract]
Cash	$ 2,772	$ 3,785
Cash equivalents	4,831	1,774
Short-term investments	28,904	32,499
Total	$ 36,507	$ 38,058

Cash, Cash Equivalents and In36

Cash, Cash Equivalents and Investments - Additional Information (Detail) - USD ($)	6 Months Ended	12 Months Ended
	Jun. 30, 2018	Dec. 31, 2017
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	$ 1,500,000	$ 1,200,000
Short-term investments, maturities	90 days
Percentage of investment in municipal bond protected by bond default insurance		8.00%
Net unrealized gains (losses)	$ 28,000	$ 34,000
China [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash in foreign bank	1,300,000	$ 1,000,000
Maximum [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Federal Deposit Insurance Corporation insured limit	$ 250,000

Cash, Cash Equivalents and In37

Cash, Cash Equivalents and Investments - Cash Equivalents and Investments (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash equivalents	$ 4,831	$ 1,774
Investments	28,904	32,499
Cash and Investments - book value	33,735	34,273
Cash and Investments - fair value	33,707	34,239
Corporate Bonds [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash equivalents	300	1,350
Investments	16,782	18,463
U.S. Government Agency Bonds [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash equivalents	826	249
Investments	2,849	4,457
Certificates of Deposit [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash equivalents	3,419	0
Investments	9,273	7,446
Money Market Funds [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash equivalents	286	175
Pre-refunded Municipal Bonds [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments	0	2,133
Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash equivalents	3,705	175
Investments	9,273	7,446
Cash and Investments - book value	12,978	7,621
Cash and Investments - fair value	12,973	7,622
Level 1 [Member] | Corporate Bonds [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash equivalents	0	0
Investments	0	0
Level 1 [Member] | U.S. Government Agency Bonds [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash equivalents	0	0
Investments	0	0
Level 1 [Member] | Certificates of Deposit [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash equivalents	3,419	0
Investments	9,273	7,446
Level 1 [Member] | Money Market Funds [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash equivalents	286	175
Level 1 [Member] | Pre-refunded Municipal Bonds [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments	0	0
Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash equivalents	1,126	1,599
Investments	19,631	25,053
Cash and Investments - book value	20,757	26,652
Cash and Investments - fair value	20,734	26,617
Level 2 [Member] | Corporate Bonds [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash equivalents	300	1,350
Investments	16,782	18,463
Level 2 [Member] | U.S. Government Agency Bonds [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash equivalents	826	249
Investments	2,849	4,457
Level 2 [Member] | Certificates of Deposit [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash equivalents	0	0
Investments	0	0
Level 2 [Member] | Money Market Funds [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash equivalents	0	0
Level 2 [Member] | Pre-refunded Municipal Bonds [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments	0	2,133
Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash equivalents	0	0
Investments	0	0
Cash and Investments - book value	0	0
Cash and Investments - fair value	0	0
Level 3 [Member] | Corporate Bonds [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash equivalents	0	0
Investments	0	0
Level 3 [Member] | U.S. Government Agency Bonds [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash equivalents	0	0
Investments	0	0
Level 3 [Member] | Certificates of Deposit [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash equivalents	0	0
Investments	0	0
Level 3 [Member] | Money Market Funds [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash equivalents	0	0
Level 3 [Member] | Pre-refunded Municipal Bonds [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments	$ 0	$ 0

Discontinued Operations - Addit

Discontinued Operations - Additional Information (Detail)	Aug. 01, 2017USD ($)Employee	Jul. 31, 2017USD ($)	Sep. 30, 2017USD ($)	Jun. 30, 2017USD ($)	Jun. 30, 2018USD ($)	Jun. 30, 2017USD ($)	Dec. 31, 2017USD ($)
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Book value of the assets sold					$ 95,170,000		$ 96,663,000
Income tax gain related to tax value of fixed assets and remaining tax value for intangible assets				$ 101,000		$ 202,000
Engineering Services [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Proceeds from sale of business		$ 1,450,000
Amount received from sale of business at closing		1,400,000
Amount recieved from sale of business		1,300,000
Proceeds from sale of business related to future services		100,000
Pre-tax book gain in discontinued operations			$ 500,000
Book value of the assets sold		600,000
Number of employees terminated | Employee	25
Estimated severance and related benefits, related to employees not subsequently hired by gabe's	$ 200,000
Income tax gain related to tax value of fixed assets and remaining tax value for intangible assets		300,000
Working capital retained including accounts receivable, accounts payable and accrued liabilities		$ 500,000
Impairment loss recorded on disposal of long-lived assets					$ 0
Engineering Services [Member] | Gabe's Construction Company Inc [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Number of employees hired | Employee	11

Discontinued Operations - Sched

Discontinued Operations - Schedule of Discontinued Operations within Statement of Operations (Detail) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2017
Discontinued Operations And Disposal Groups [Abstract]
Revenues	$ 1,348	$ 3,357
Cost of revenues	1,411	3,559
Gross profit	(63)	(202)
Operating expenses:
Sales and marketing	194	348
General and administrative	13	26
Restructuring expenses	(1)	8
Total operating expenses	206	382
Operating loss	(269)	(584)
Benefit for income taxes	(101)	(202)
Net loss	$ (168)	$ (382)

Discontinued Operations - Sch40

Discontinued Operations - Schedule of Cash Flows for Discontinued Operations (Detail) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Operating Activities:
Net loss	$ (168)		$ (382)
Depreciation			197
Deferred tax provision			(202)
Stock compensation			49
Prepaid expenses and other assets			(11)
Net cash used in operating activities		$ 0	(349)
Investing Activities:
Capital expenditures			(16)
Net cash used in investing activities		0	(16)
Net cash flows used in discontinued operations		$ 0	$ (365)

Goodwill and Intangible Assets

Goodwill and Intangible Assets - Additional Information (Detail) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Finite Lived Intangible Assets [Line Items]
Change in goodwill	$ 0		$ 0
Goodwill	3,332,000		3,332,000		$ 3,332,000
Amortization of intangible assets	291,000	$ 291,000	581,000	$ 581,000
Increase (decrease) in cost of intangible assets			$ 600,000
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			6 years
Operating Expense [Member]
Finite Lived Intangible Assets [Line Items]
Amortization of intangible assets	100,000	100,000	$ 300,000	300,000
Cost of Revenues [Member]
Finite Lived Intangible Assets [Line Items]
Amortization of intangible assets	200,000	$ 200,000	300,000	$ 300,000
RF Solutions [Member]
Finite Lived Intangible Assets [Line Items]
Goodwill	$ 3,300,000		$ 3,300,000

Goodwill and Intangible Asset42

Goodwill and Intangible Assets - Summary of Other Intangible Assets (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Finite Lived Intangible Assets [Line Items]
Cost	$ 34,334	$ 34,334
Accumulated Amortization	32,802	32,221
Net Book Value	1,532	2,113
Customer Contracts and Relationships [Member]
Finite Lived Intangible Assets [Line Items]
Cost	16,880	16,880
Accumulated Amortization	16,880	16,880
Net Book Value	0	0
Patents and Technology [Member]
Finite Lived Intangible Assets [Line Items]
Cost	10,114	10,114
Accumulated Amortization	9,003	8,670
Net Book Value	1,111	1,444
Trademarks and Trade Names [Member]
Finite Lived Intangible Assets [Line Items]
Cost	4,834	4,834
Accumulated Amortization	4,510	4,335
Net Book Value	324	499
Other [Member]
Finite Lived Intangible Assets [Line Items]
Cost	2,506	2,506
Accumulated Amortization	2,409	2,336
Net Book Value	$ 97	$ 170

Goodwill and Intangible Asset43

Goodwill and Intangible Assets - Summary of Assigned Lives and Weighted Average Amortization Periods by Intangible Asset Category (Detail)	6 Months Ended
	Jun. 30, 2018
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	6 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
Weighted Average Amortization Period	5 years 1 month 6 days
Patents and Technology [Member] | Minimum [Member]
Summary of assigned lives and weighted average amortization periods by intangible asset category
Assigned Life	5 years
Patents and Technology [Member] | Maximum [Member]
Summary of assigned lives and weighted average amortization periods by intangible asset category
Assigned Life	6 years
Trademarks and Trade Names [Member]
Summary of assigned lives and weighted average amortization periods by intangible asset category
Weighted Average Amortization Period	5 years 7 months 6 days
Trademarks and Trade Names [Member] | Minimum [Member]
Summary of assigned lives and weighted average amortization periods by intangible asset category
Assigned Life	5 years
Trademarks and Trade Names [Member] | Maximum [Member]
Summary of assigned lives and weighted average amortization periods by intangible asset category
Assigned Life	6 years
Other [Member]
Summary of assigned lives and weighted average amortization periods by intangible asset category
Weighted Average Amortization Period	3 years
Other [Member] | Minimum [Member]
Summary of assigned lives and weighted average amortization periods by intangible asset category
Assigned Life	1 year
Other [Member] | Maximum [Member]
Summary of assigned lives and weighted average amortization periods by intangible asset category
Assigned Life	6 years

Goodwill and Intangible Asset44

Goodwill and Intangible Assets - Schedule of Expected Amortization Expense (Detail) $ in Thousands	Jun. 30, 2018USD ($)
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
2,018	$ 1,084
2,019	885
2,020	$ 144

Balance Sheet Information - Add

Balance Sheet Information - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Allowance for doubtful accounts	$ 164		$ 164		$ 319
Consigned inventory with customers	800		800		500
Allowance for inventory losses	3,000		3,000		$ 3,000
Depreciation and amortization	$ 700	$ 600	$ 1,400	$ 1,300
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 [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 [Member]
Property, Plant and Equipment [Line Items]
Period over which assets are depreciated			5 years

Balance Sheet Information - Sum

Balance Sheet Information - Summary of Inventories (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Inventory Net [Abstract]
Raw materials	$ 7,333	$ 6,849
Work-in-process	1,260	962
Finished goods	4,877	4,945
Inventories, net	$ 13,470	$ 12,756

Balance Sheet Information - S47

Balance Sheet Information - Summary of Property and Equipment (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 34,619	$ 32,988
Less: Accumulated depreciation and amortization	(23,545)	(22,389)
Land	1,770	1,770
Property and equipment, net	12,844	12,369
Building [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment	6,351	6,351
Computers and Office Equipment [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment	11,379	10,873
Manufacturing and Test Equipment [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment	13,846	13,012
Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment	1,368	1,288
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment	1,655	1,444
Motor Vehicles [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 20	$ 20

Balance Sheet Information - S48

Balance Sheet Information - Summary of Accrued Liabilities (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Payables And Accruals [Abstract]
Inventory receipts	$ 1,421	$ 1,730
Paid time off	1,116	1,011
Payroll, bonuses, and other employee benefits	869	2,780
Warranties	401	382
Employee stock purchase plan	354	314
Professional fees and contractors	251	155
Deferred revenues	204	189
Customer refunds for estimated returns	186	197
Income and sales taxes	117	243
Short-term obligations under capital leases	105	97
Real estate taxes	74	148
Other	315	235
Total	$ 5,413	$ 7,481

Balance Sheet Information - S49

Balance Sheet Information - Summary of Long-term Liabilities (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Liabilities Noncurrent [Abstract]
Capital leases	$ 170	$ 180
Deferred rent	132	89
Other	151	123
Total	$ 453	$ 392

Stock-Based Compensation - Addi

Stock-Based Compensation - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Stock compensation expense	$ 1.1	$ 1.1	$ 1.8	$ 1.8

Stock-Based Compensation - Summ

Stock-Based Compensation - Summary of Stock-Based Compensation Expense by Type (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Stock Based Compensation [Line Items]
Total	$ 1,118	$ 1,116	$ 1,786	$ 1,846
Continuing Operations [Member]
Stock Based Compensation [Line Items]
Total	1,118	1,088	1,786	1,797
Discontinued Operations [Member]
Stock Based Compensation [Line Items]
Total	0	28	0	49
Service-based awards [Member] | Continuing Operations [Member]
Stock Based Compensation [Line Items]
Total	1,102	1,054	1,674	1,679
Equity Awards for Short-term Incentive Plan [Member] | Continuing Operations [Member]
Stock Based Compensation [Line Items]
Total	(41)	46	0	88
Stock Option and Employee Purchase Plans [Member] | Continuing Operations [Member]
Stock Based Compensation [Line Items]
Total	$ 57	$ (12)	$ 112	$ 30

Stock-Based Compensation - Stoc

Stock-Based Compensation - Stock-Based Compensation (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Stock-based compensation	$ 1,118	$ 1,116	$ 1,786	$ 1,846
Continuing Operations [Member]
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Stock-based compensation	1,118	1,088	1,786	1,797
Discontinued Operations [Member]
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Stock-based compensation	0	28	0	49
Cost of Revenues [Member] | Continuing Operations [Member]
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Stock-based compensation	92	72	180	133
Research and Development [Member] | Continuing Operations [Member]
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Stock-based compensation	159	119	297	266
Sales and Marketing [Member] | Continuing Operations [Member]
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Stock-based compensation	157	127	288	246
General and Administrative [Member] | Continuing Operations [Member]
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Stock-based compensation	$ 710	$ 770	$ 1,021	$ 1,152

Stock-Based Compensation - Rest

Stock-Based Compensation - Restricted Stock - Service-Based - Additional Information (Detail) - USD ($)	3 Months Ended			6 Months Ended
	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Board of Directors [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grants vesting period	3 years
Service Based Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock awards issued during the period		420,977
Restricted shares vested grant date intrinsic value	$ 0		$ 200,000	$ 800,000	$ 1,200,000
Unrecognized compensation expense	$ 4,400,000			$ 4,400,000
Weighted average period				1 year 6 months
Service Based Restricted Stock [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grants vesting period		3 years
Restricted Stock [Member] | Board of Directors [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock awards issued during the period	60,998

Stock-Based Compensation - Su54

Stock-Based Compensation - Summary of Service-based Restricted Stock Activity (Detail) - Restricted Stock [Member]	6 Months Ended
	Jun. 30, 2018$ / sharesshares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unvested Beginning balance, Shares | shares	828,576
Shares awarded, Shares | shares	481,975
Shares vested, Shares | shares	(176,798)
Shares cancelled, Shares | shares	(1,500)
Unvested Ending balance, Shares | shares	1,132,253
Unvested Beginning balance, Weighted Average Fair Value | $ / shares	$ 5.66
Shares awarded, Weighted Average Fair Value | $ / shares	6.94
Shares vested, Weighted Average Fair Value | $ / shares	6.42
Shares cancelled, Weighted Average Fair Value | $ / shares	6.01
Unvested Ending balance, Weighted Average Fair Value | $ / shares	$ 6.09

Stock-Based Compensation - Su55

Stock-Based Compensation - Summary of Restricted Stock Unit Activity (Detail) - Restricted Stock Units [Member]	6 Months Ended
	Jun. 30, 2018$ / sharesshares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unvested Beginning balance, Shares | shares	31,800
Units awarded, Shares | shares	5,500
Units vested/Shares awarded, Shares | shares	(4,087)
Units cancelled, Shares | shares	(75)
Unvested Ending balance, Shares | shares	33,138
Unvested Beginning balance, Weighted Average Fair Value | $ / shares	$ 5.47
Units awarded, Weighted Average Fair Value | $ / shares	7.05
Units vested/Shares awarded, Weighted Average Fair Value | $ / shares	5.79
Units cancelled, Weighted Average Fair Value | $ / shares	7.49
Unvested Ending balance, Weighted Average Fair Value | $ / shares	$ 5.68

Stock-Based Compensation - Re56

Stock-Based Compensation - Restricted Stock Units - Service-Based - Additional Information (Detail) - Service Based Restricted Stock Units [Member] - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted shares vested intrinsic value	$ 0	$ 17,000	$ 29,000	$ 23,000
Unrecognized compensation expense	$ 100,000		$ 100,000
Weighted average period			1 year 2 months 12 days

Stock-Based Compensation - St57

Stock-Based Compensation - Stock Options - Additional Information (Detail) $ / shares in Units, $ in Millions	6 Months Ended
	Jun. 30, 2018USD ($)$ / sharesshares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Lower range of exercise prices	$ 5
Upper range of exercise prices	10.46
Intrinsic value based on share price	$ 6.24
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee stock options vesting provisions, description	The stock options have a seven-year life and generally vest over a period of four years, 25% after one year, and ratably on a monthly basis thereafter.
Options vested in remaining period	4 years
Options vesting percentage after one year	25.00%
Period of termination of employment	90 days
Stock options granted period	7 years
Lower range of exercise prices	$ 5
Upper range of exercise prices	$ 10.46
Options Outstanding, Granted | shares	2,000
Period of expected life, options granted	5 years
Unrecognized compensation expense | $	$ 9
Weighted average period	1 year 3 months 18 days

Stock-Based Compensation - Su58

Stock-Based Compensation - Summary of Stock Option Activity (Detail) - Stock Options [Member]	6 Months Ended
	Jun. 30, 2018$ / sharesshares
Summary Of Stock Option Activities [Line Items]
Options Outstanding, Beginning balance, Shares | shares	470,484
Options Outstanding, Granted | shares	2,000
Options Outstanding, Forfeited | shares	(84)
Options Outstanding, Cancelled/expired | shares	(21,216)
Options Outstanding, Ending balance, Shares | shares	451,184
Options Exercisable, Ending balance, Shares | shares	440,285
Weighted Average Exercise Price, Beginning balance | $ / shares	$ 7.24
Weighted Average Exercise Price, Options granted | $ / shares	6.98
Weighted Average Exercise Price, Options forfeited | $ / shares	7.31
Weighted Average Exercise Price, Options cancelled/expired | $ / shares	9.11
Weighted Average Exercise Price, Ending balance | $ / shares	7.15
Weighted Average Exercise Price, Exercisable | $ / shares	$ 7.19

Stock-Based Compensation - Info

Stock-Based Compensation - Information about Stock Options Outstanding Under all Stock Plans (Detail)	6 Months Ended
	Jun. 30, 2018$ / sharesshares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Lower range of exercise prices	$ 5
Upper range of exercise prices	$ 10.46
Options Outstanding, Number | shares	451,184
Options Outstanding, Weighted Average Contractual Life (Years)	1 year 11 months 4 days
Options Outstanding, Weighted-Average Exercise Price	$ 7.15
Options Exercisable, Number | shares	440,285
Options Exercisable, Weighted Average Exercise Price	$ 7.19
Range One [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Lower range of exercise prices	5
Upper range of exercise prices	$ 6
Options Outstanding, Number | shares	13,500
Options Outstanding, Weighted Average Contractual Life (Years)	5 years 2 months 23 days
Options Outstanding, Weighted-Average Exercise Price	$ 5.05
Options Exercisable, Number | shares	5,739
Options Exercisable, Weighted Average Exercise Price	$ 5.05
Range Two [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Lower range of exercise prices	6
Upper range of exercise prices	$ 7
Options Outstanding, Number | shares	9,189
Options Outstanding, Weighted Average Contractual Life (Years)	2 years 6 months
Options Outstanding, Weighted-Average Exercise Price	$ 6.75
Options Exercisable, Number | shares	7,189
Options Exercisable, Weighted Average Exercise Price	$ 6.69
Range Three [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Lower range of exercise prices	7
Upper range of exercise prices	$ 8
Options Outstanding, Number | shares	421,345
Options Outstanding, Weighted Average Contractual Life (Years)	1 year 9 months 18 days
Options Outstanding, Weighted-Average Exercise Price	$ 7.20
Options Exercisable, Number | shares	420,864
Options Exercisable, Weighted Average Exercise Price	$ 7.20
Range Four [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Lower range of exercise prices	8
Upper range of exercise prices	$ 9
Options Outstanding, Number | shares	5,000
Options Outstanding, Weighted Average Contractual Life (Years)	3 years 3 months 10 days
Options Outstanding, Weighted-Average Exercise Price	$ 8.14
Options Exercisable, Number | shares	4,343
Options Exercisable, Weighted Average Exercise Price	$ 8.14
Range Five [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Lower range of exercise prices	9
Upper range of exercise prices	$ 10
Options Outstanding, Number | shares	750
Options Outstanding, Weighted Average Contractual Life (Years)	2 years 4 months 6 days
Options Outstanding, Weighted-Average Exercise Price	$ 9.68
Options Exercisable, Number | shares	750
Options Exercisable, Weighted Average Exercise Price	$ 9.68
Range Six [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Lower range of exercise prices	10
Upper range of exercise prices	$ 10.46
Options Outstanding, Number | shares	1,400
Options Outstanding, Weighted Average Contractual Life (Years)	1 month 2 days
Options Outstanding, Weighted-Average Exercise Price	$ 10.46
Options Exercisable, Number | shares	1,400
Options Exercisable, Weighted Average Exercise Price	$ 10.46

Stock-Based Compensation - Weig

Stock-Based Compensation - Weighted Average Contractual Life and Intrinsic Value of Options Outstanding and Options Exercisable (Detail) $ in Thousands	6 Months Ended
	Jun. 30, 2018USD ($)
Share Based Compensation Arrangement By Share Based Payment Award Options Additional Disclosures [Abstract]
Options Outstanding Weighted Average Contractual Life (years)	1 year 11 months 4 days
Options Exercisable Weighted Average Contractual Life (years)	1 year 10 months 2 days
Options Outstanding Intrinsic Value	$ 16
Options Exercisable Intrinsic Value	$ 7

Stock-Based Compensation - Calc

Stock-Based Compensation - Calculation of Fair Value of Each Option Grant Using Black-Scholes Option-Pricing Model (Detail) - Stock Options [Member]	6 Months Ended
	Jun. 30, 2018
Calculation of fair value of each option grant using the Black-Scholes option-pricing model
Dividend yield	3.20%
Risk-free interest rate	2.40%
Expected volatility	33.00%
Expected life (in years)	3 years 8 months 12 days

Stock-Based Compensation - Perf

Stock-Based Compensation - Performance-based Equity Awards - Additional Information (Detail) - shares	Jun. 30, 2018	Dec. 31, 2017
Performance Based Equity Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unvested performance awards	110,500	110,500

Stock-Based Compensation - Shor

Stock-Based Compensation - Short-term Incentive Plan - Additional Information (Detail) - Short-Term Incentive Plan (STIP) [Member]	6 Months Ended
	Jun. 30, 2018
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%
All Other Participants [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of incentive awards in cash	100.00%

Stock-Based Compensation - Empl

Stock-Based Compensation - Employee Stock Purchase Plan ("ESPP") - Additional Information (Detail) - USD ($) $ in Millions	1 Months Ended		6 Months Ended
	Feb. 28, 2018	Feb. 28, 2017	Jun. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Offering period			6 months
Employee Stock Purchase Plan ("ESPP") [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of fair market value to determine purchase price			85.00%
Proceeds of from issuance of shares under ESPP	$ 0.4	$ 0.3
Options issued	68,212	72,218
Rate of discount on fair market value of common stock under ESPP			15.00%
Period of expected life, options granted			5 years

Stock-Based Compensation - Ca65

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 ("ESPP") [Member]	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Calculation of fair value of each employee stock purchase grant using the Black-Scholes option-pricing model
Dividend yield	3.20%	3.80%
Risk-free interest rate	2.10%	0.80%
Expected volatility	33.00%	33.00%
Expected life (in years)	6 months	6 months

Stock-Based Compensation - Boar

Stock-Based Compensation - Board of Director Equity Awards - Additional Information (Detail) - Board of Directors [Member] - USD ($) $ in Millions	3 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
One-time grant vesting period	3 years
Common stock issued	60,988	52,786
Company's stock at fair value	$ 0.4	$ 0.4

Stock-Based Compensation - Em67

Stock-Based Compensation - Employee Withholding Taxes on Stock Awards - Additional Information (Detail) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Payment of withholding taxes related to stock awards	$ 289	$ 692
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	$ 300	$ 600

Benefit Plans - Additional Info

Benefit Plans - Additional Information (Detail) - Employee Benefit Plans [Member]	6 Months Ended
	Jun. 30, 2018
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		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Defined Benefit Plan Disclosure [Line Items]
Contribution to retirement plans	$ 297	$ 284	$ 627	$ 567
US Employees [Member]
Defined Benefit Plan Disclosure [Line Items]
Contribution to retirement plans	163	175	365	360
Foreign Employees [Member]
Defined Benefit Plan Disclosure [Line Items]
Contribution to retirement plans	$ 134	$ 109	$ 262	$ 207

Commitments and Contingencies -

Commitments and Contingencies - Summary of Restructuring Activity (Detail) - Lease Terminations [Member] $ in Thousands	6 Months Ended
	Jun. 30, 2018USD ($)
Restructuring Cost And Reserve [Line Items]
Beginning balance	$ 116
Restructuring expense	0
Payments	(18)
Ending balance	$ 98

Commitments and Contingencies71

Commitments and Contingencies - Summary of Restructuring Liability Recorded (Detail) - Discontinued Operations [Member] - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Restructuring Cost And Reserve [Line Items]
Restructuring liability	$ 98	$ 116
Accrued Liabilities [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring liability	37	35
Long-term Liabilities [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring liability	$ 61	$ 81

Commitments and Contingencies72

Commitments and Contingencies - Future Minimum Rental Payments Under Operating Leases (Detail) $ in Thousands	Jun. 30, 2018USD ($)
Operating Leases Future Minimum Payments Due [Abstract]
2,018	$ 610
2,019	1,127
2,020	515
2,021	145
2,022	146
Thereafter	268
Future minimum lease payments	$ 2,811

Commitments and Contingencies73

Commitments and Contingencies - Additional Information (Detail) $ in Thousands	1 Months Ended		3 Months Ended		6 Months Ended
	Aug. 31, 2017USD ($)ft²	May 31, 2017	Jun. 30, 2018USD ($)	Jun. 30, 2017USD ($)	Jun. 30, 2018USD ($)	Jun. 30, 2017USD ($)	Dec. 31, 2017USD ($)	Dec. 31, 2016USD ($)
Commitments And Contingencies Disclosure [Line Items]
Rent expense under leases			$ 200	$ 300	$ 500	$ 500
Refund liability related to estimated sales returns			186		186		$ 197
Warranty reserve			401		$ 401		382
Antenna [Member]
Commitments And Contingencies Disclosure [Line Items]
Repair and replacement warranty					5 years
Warranty Reserves [Member]
Commitments And Contingencies Disclosure [Line Items]
Warranty reserve			$ 401	$ 421	$ 401	$ 421	$ 382	$ 394
Akron, Ohio [Member]
Commitments And Contingencies Disclosure [Line Items]
Annual capital lease obligation	$ 100
Capital lease, assumed occupancy date	2018-03
Akron, Ohio [Member] | Connected Solutions [Member]
Commitments And Contingencies Disclosure [Line Items]
Lease term	7 years
Area of office space | ft²	5,977
Colorado Office [Member]
Commitments And Contingencies Disclosure [Line Items]
Lease expiration date		Oct. 31, 2020

Commitments and Contingencies74

Commitments and Contingencies - Summary of Capital Leases for Office Equipment (Detail) - Office Equipment [Member] - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Capital Leased Assets [Line Items]
Cost	$ 502	$ 453
Accumulated Depreciation	(236)	(195)
Net Book Value	$ 266	$ 258

Commitments and Contingencies75

Commitments and Contingencies - Present Value of Net Minimum Lease Payments, Capital Leases (Detail) $ in Thousands	Jun. 30, 2018USD ($)
Commitments And Contingencies Disclosure [Abstract]
2,018	$ 57
2,019	98
2,020	61
2,021	48
2,022	23
Thereafter	7
Total minimum payments required	294
Less: amount representing interest	19
Present value of net minimum lease payments	$ 275

Commitments and Contingencies76

Commitments and Contingencies - Changes in Warranty Reserves (Detail) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Changes in warranty reserves
Beginning balance	$ 382
Ending balance	401
Warranty Reserves [Member]
Changes in warranty reserves
Beginning balance	382	$ 394
Provisions for warranties	65	74
Consumption of reserves	(46)	(47)
Ending balance	$ 401	$ 421

Income Taxes - Additional Infor

Income Taxes - Additional Information (Detail) - USD ($)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Income Tax Disclosure [Line Items]
Statutory rate	21.00%	34.00%	21.00%	34.00%	34.00%
Income tax expense (benefit)	$ (167,000)	$ (140,000)	$ (479,000)	$ (274,000)
Income tax deficiencies with restricted stock and stock options		100,000		100,000
Accrued one-time income tax charge related to deemed repatriation of accumulated unremitted earnings and profits of foreign subsidiaries					$ 600,000
Adjustments related to transition tax	0		$ 0
Designed to tax global intangible low taxed income, minimum percentage return on depreciable tangible assets.			10.00%
Deferred tax assets, net of deferred tax liabilities	8,200,000		$ 8,200,000		7,700,000
Operating loss and credit carry forward, expiration period			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			13 years
Deferred tax assets, valuation allowance	5,400,000		$ 5,400,000		5,200,000
Gross unrecognized tax benefit	$ 700,000		$ 700,000		$ 700,000
Research Tax Credit Carryforward [Member]
Income Tax Disclosure [Line Items]
Tax benefit related to previously unrecognized tax benefits		$ 100,000		$ 100,000

Segment, Customer and Geograp78

Segment, Customer and Geographic Information - Additional Information (Detail)	6 Months Ended
	Jun. 30, 2018Segment
Segment Reporting [Abstract]
Number of reporting segments	2

Segment, Customer and Geograp79

Segment, Customer and Geographic Information - Result of Operations by Segments (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Results of operations by segments
REVENUES	$ 21,582	$ 21,501	$ 43,313	$ 44,471
GROSS PROFIT	7,799	8,962	15,663	18,416
OPERATING INCOME (LOSS) FOR CONTINUING OPERATIONS	(1,602)	(339)	(2,823)	(317)
Depreciation	707	634	1,381	1,262
Intangible amortization	291	291	581	581
Capital expenditures	635	494	1,519	1,544
Operating Segments [Member] | Connected Solutions [Member]
Results of operations by segments
REVENUES	17,478	16,866	35,243	34,137
GROSS PROFIT	5,031	5,731	10,229	11,135
OPERATING INCOME (LOSS) FOR CONTINUING OPERATIONS	1,530	2,349	3,134	4,095
Depreciation	513	425	991	851
Intangible amortization	39	39	78	78
Capital expenditures	578	334	1,298	844
Operating Segments [Member] | RF Solutions [Member]
Results of operations by segments
REVENUES	4,135	4,661	8,134	10,418
GROSS PROFIT	2,755	3,223	5,426	7,270
OPERATING INCOME (LOSS) FOR CONTINUING OPERATIONS	(398)	411	(724)	1,432
Depreciation	135	138	271	279
Intangible amortization	252	252	503	503
Capital expenditures	55	226	162	298
Corporate, Non-Segment [Member]
Results of operations by segments
REVENUES	(31)	(26)	(64)	(84)
GROSS PROFIT	13	8	8	11
OPERATING INCOME (LOSS) FOR CONTINUING OPERATIONS	(2,734)	(3,099)	(5,233)	(5,844)
Depreciation	59	71	119	132
Intangible amortization	0	0	0	0
Capital expenditures	$ 2	$ (66)	$ 59	$ 402

Segment, Customer and Geograp80

Segment, Customer and Geographic Information - Assets by Segment (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Assets by segments
Accounts receivable	$ 17,929	$ 18,624
Inventories	13,470	12,756
Property and equipment, net	12,844	12,369
Goodwill	3,332	3,332
Intangible assets, net	1,532	2,113
Deferred tax assets, net	8,213	7,734
Other noncurrent assets	58	72
RF Solutions [Member]
Assets by segments
Goodwill	3,300
Operating Segments [Member] | Connected Solutions [Member]
Assets by segments
Accounts receivable	13,341	13,158
Inventories	12,118	11,418
Property and equipment, net	10,806	10,161
Goodwill	0	0
Intangible assets, net	0	78
Deferred tax assets, net	0	0
Other noncurrent assets	0	0
Operating Segments [Member] | RF Solutions [Member]
Assets by segments
Accounts receivable	4,588	5,466
Inventories	1,352	1,338
Property and equipment, net	1,201	1,300
Goodwill	3,332	3,332
Intangible assets, net	1,532	2,035
Deferred tax assets, net	0	0
Other noncurrent assets	0	0
Corporate, Non-Segment [Member]
Assets by segments
Accounts receivable	0	0
Inventories	0	0
Property and equipment, net	837	908
Goodwill	0	0
Intangible assets, net	0	0
Deferred tax assets, net	8,213	7,734
Other noncurrent assets	$ 58	$ 72

Segment, Customer and Geograp81

Segment, Customer and Geographic Information - Customer Accounted Revenues by Geographic Location (Detail) - Sales [Member] - Geographic Concentration Risk [Member]	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Asia Pacific [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total Sales	18.00%	17.00%	17.00%	20.00%
Europe, Middle East, & Africa [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total Sales	11.00%	9.00%	10.00%	8.00%
Other Americas [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total Sales	4.00%	6.00%	4.00%	5.00%
Total Foreign Sales [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total Sales	33.00%	32.00%	31.00%	33.00%

Segment, Customer and Geograp82

Segment, Customer and Geographic Information - Schedule of Revenues and Total Trade Accounts Receivable Represents Customer Accounted for 10% or More Percentage (Detail) - Customer Concentration Risk [Member]	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Sales [Member] | Customer A [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Customer A	11.00%	10.00%	10.00%	9.00%
Trade Accounts Receivable [Member] | Customer A [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Customer A			11.00%		7.00%
Trade Accounts Receivable [Member] | Customer B [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Customer A			4.00%		12.00%

Revenue from Contracts with C83

Revenue from Contracts with Customers - Additional Information (Detail) - USD ($)	3 Months Ended	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2018	Dec. 31, 2017
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.
Period for performance obligation to provide software maintenance and support	1 year	1 year
Refund liability	$ 186,000	$ 186,000	$ 197,000
Contract assets	0	0	0
Contract with customer liability, revenue recognized	100,000	200,000
Accrued Liabilities [Member]
Disaggregation Of Revenue [Line Items]
Refund liability	200,000	200,000	200,000
Contract liability	300,000	300,000	300,000
Inventories [Member]
Disaggregation Of Revenue [Line Items]
Product return asset	$ 100,000	$ 100,000	$ 100,000

Subsequent Events - Additional

Subsequent Events - Additional Information (Detail) - USD ($) $ in Thousands	Jul. 06, 2018	Jul. 31, 2018	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018
Subsequent Event [Line Items]
Customer revenues			$ 21,582	$ 21,501	$ 43,313	$ 44,471
Antenna [Member]
Subsequent Event [Line Items]
Customer revenues							$ 7,500
Antenna [Member] | Subsequent Events [Member]
Subsequent Event [Line Items]
Percentage of import duties on product	25.00%
Percentage upcharge on products to recover impact of additional costs		20.00%