TechTarget (TTGT) 10-K 13 Mar 18 2017 FY Annual report Financial data

Document and Entity Information

Document and Entity Information - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Feb. 28, 2018	Jun. 30, 2017
Document And Entity Information [Abstract]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec. 31, 2017
Document Fiscal Year Focus	2,017
Document Fiscal Period Focus	FY
Trading Symbol	TTGT
Entity Registrant Name	TechTarget Inc
Entity Central Index Key	1,293,282
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	No
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Filer Category	Accelerated Filer
Entity Common Stock, Shares Outstanding		27,483,367
Entity Public Float			$ 126.7

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 25,966	$ 18,485
Short-term investments	7,650	10,988
Accounts receivable, net of allowance for doubtful accounts of $1,783 and $1,961 as of December 31, 2017 and 2016, respectively	29,601	22,551
Prepaid taxes	1,303	3,961
Prepaid expenses and other current assets	3,088	1,952
Total current assets	67,608	57,937
Property and equipment, net	9,786	9,232
Long-term investments	496	7,801
Goodwill	93,793	93,469
Intangible assets, net	506	601
Deferred tax assets	98	139
Other assets	882	898
Total assets	173,169	170,077
Current liabilities:
Accounts payable	1,542	2,100
Current portion of term loan	9,888	6,157
Accrued expenses and other current liabilities	3,343	2,792
Accrued compensation expenses	1,397	698
Income taxes payable	218	122
Deferred revenue	7,598	6,079
Total current liabilities	23,986	17,948
Long-term liabilities:
Long-term portion of term loan	22,339	32,286
Deferred rent	5,259	2,080
Deferred tax liabilities	838	200
Total liabilities	52,422	52,514
Commitments and contingencies (See Note 9)
Stockholders’ equity:
Preferred stock, 5,000,000 shares authorized; no shares issued or outstanding
Common stock, $0.001 par value per share, 100,000,000 shares authorized; 53,338,297 shares issued and 27,483,115 shares outstanding at December 31, 2017; 52,601,284 shares issued and 27,495,539 shares outstanding at December 31, 2016	53	52
Treasury stock, 25,855,182 and 25,105,745 shares at December 31, 2017 and 2016, respectively, at cost	(170,816)	(162,731)
Additional paid-in capital	300,763	296,853
Accumulated other comprehensive income (loss)	65	(248)
Accumulated deficit	(9,318)	(16,363)
Total stockholders’ equity	120,747	117,563
Total liabilities and stockholders’ equity	$ 173,169	$ 170,077

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Statement Of Financial Position [Abstract]
Allowance for doubtful accounts, accounts receivable	$ 1,783	$ 1,961
Preferred stock, shares authorized	5,000,000	5,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value	$ 0.001	$ 0.001
Common stock, shares authorized	100,000,000	100,000,000
Common stock, shares issued	53,338,297	52,601,284
Common stock, shares outstanding	27,483,115	27,495,539
Treasury stock, shares	25,855,182	25,105,745

Consolidated Statements of Inco

Consolidated Statements of Income and Comprehensive Income - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Revenues:
Online		$ 108,388	$ 101,827	$ 105,574
Events		168	4,798	6,252
Total revenues		108,556	106,625	111,826
Cost of revenues:
Online	[1]	28,295	27,545	26,962
Events		41	2,672	2,941
Total cost of revenues		28,336	30,217	29,903
Gross profit		80,220	76,408	81,923
Operating expenses:
Selling and marketing	[1]	44,747	44,316	43,722
Product development	[1]	8,215	8,038	7,680
General and administrative	[1]	12,212	12,370	12,987
Depreciation		4,467	4,084	3,982
Amortization of intangible assets		169	809	1,382
Total operating expenses		69,810	69,617	69,753
Operating income		10,410	6,791	12,170
Interest and other expense, net		(693)	(1,774)	(249)
Income before provision for income taxes		9,717	5,017	11,921
Provision for income taxes		2,914	2,598	4,735
Net income		6,803	2,419	7,186
Other comprehensive income (loss), net of tax:
Unrealized gain (loss) on investments (net of tax (provision) benefit of $(7), $6, and $(0), respectively)		13	(10)	1
Foreign currency translation adjustments		300	84	(236)
Other comprehensive income (loss)		313	74	(235)
Comprehensive income		$ 7,116	$ 2,493	$ 6,951
Net income per common share:
Basic		$ 0.25	$ 0.08	$ 0.22
Diluted		$ 0.24	$ 0.08	$ 0.21
Weighted average common shares outstanding:
Basic		27,550,044	29,953,798	32,963,185
Diluted		28,271,384	30,773,532	34,475,805
[1]	Amounts include stock-based compensation expense as follows: Cost of online revenues $43 $112 $84 Selling and marketing 4,120 4,119 3,530 Product development 112 159 111 General and administrative 2,637 2,462 2,899

Consolidated Statements of Inc5

Consolidated Statements of Income and Comprehensive Income (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Unrealized gain (loss) on investments, tax effect	$ 7	$ (6)	$ 0
Cost of Online Revenues [Member]
Allocated stock-based compensation expense	43	112	84
Selling and Marketing [Member]
Allocated stock-based compensation expense	4,120	4,119	3,530
Product Development [Member]
Allocated stock-based compensation expense	112	159	111
General and Administrative [Member]
Allocated stock-based compensation expense	$ 2,637	$ 2,462	$ 2,899

Consolidated Statements of Stoc

Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock [Member]	Treasury Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Other Comprehensive (Loss) Income [Member]	Accumulated Deficit [Member]
Beginning balance at Dec. 31, 2014	$ 155,846	$ 50	$ (98,851)	$ 280,702	$ (87)	$ (25,968)
Beginning balance, shares at Dec. 31, 2014		49,587,137	17,215,886
Issuance of common stock from stock options and restricted stock units	2,802	$ 1		2,801
Issuance of common stock from stock options and restricted stock units, shares		1,223,528
Purchase of common stock through stock repurchase program	(15,098)		$ (15,098)
Purchase of common stock through stock repurchase program, shares			1,671,687
Shelf registration and other fees	(20)			(20)
Excess tax benefit and shortfalls — stock options	3,216			3,216
Stock-based compensation expense	6,624			6,624
Tax withholdings related to net share settlement of RSU’s	(1,705)			(1,705)
Shares issued in payment of accrued compensation	1,385			1,385
Shares issued in payment of accrued compensation, shares		116,761
Unrealized gain (loss) on investments	1				1
Unrealized gain (loss) on foreign currency translation	(236)				(236)
Net income	7,186					7,186
Ending balance at Dec. 31, 2015	160,001	$ 51	$ (113,949)	293,003	(322)	(18,782)
Ending balance, shares at Dec. 31, 2015		50,927,426	18,887,573
Issuance of common stock from stock options and restricted stock units	4,192	$ 1		4,191
Issuance of common stock from stock options and restricted stock units, shares		1,673,858
Purchase of common stock through stock repurchase program	(7,988)		$ (7,988)
Purchase of common stock through stock repurchase program, shares			980,329
Purchase of common stock through tender offer (including $0.2in related costs)	(40,794)		$ (40,794)
Purchase of common stock through tender offer, shares			5,237,843
Excess tax benefit and shortfalls — stock options	(2,747)			(2,747)
Stock-based compensation expense	6,852			6,852
Tax withholdings related to net share settlement of RSU’s	(4,446)			(4,446)
Unrealized gain (loss) on investments	(10)				(10)
Unrealized gain (loss) on foreign currency translation	84				84
Net income	2,419					2,419
Ending balance at Dec. 31, 2016	117,563	$ 52	$ (162,731)	296,853	(248)	(16,363)
Ending balance, shares at Dec. 31, 2016		52,601,284	25,105,745
Issuance of common stock from stock options and restricted stock units	942	$ 1		941
Issuance of common stock from stock options and restricted stock units, shares		737,013
Purchase of common stock through stock repurchase program	(8,085)		$ (8,085)
Purchase of common stock through stock repurchase program, shares			749,437
Shelf registration and other fees	(3)			(3)
Stock-based compensation expense	6,912			6,912
Tax withholdings related to net share settlement of RSU’s	(3,940)			(3,940)
Unrealized gain (loss) on investments	13				13
Unrealized gain (loss) on foreign currency translation	300				300
Reclassification for adoption of ASU 2016-09	242					242
Net income	6,803					6,803
Ending balance at Dec. 31, 2017	$ 120,747	$ 53	$ (170,816)	$ 300,763	$ 65	$ (9,318)
Ending balance, shares at Dec. 31, 2017		53,338,297	25,855,182

Consolidated Statements of Sto7

Consolidated Statements of Stockholders' Equity (Parenthetical) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Purchase of common stock through tender offer, related costs		$ 200
Tax provision (benefit) on unrealized loss on investments	$ 7,000	(6,000)
Accumulated Other Comprehensive (Loss) Income [Member]
Tax provision (benefit) on unrealized loss on investments	$ 7,000	$ (6,000)

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Operating Activities:
Net income	$ 6,803	$ 2,419	$ 7,186
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	4,636	4,893	5,364
Provision for bad debt	806	894	805
Amortization of investment premiums	262	308	236
Stock-based compensation	6,912	6,852	6,624
Amortization of debt issuance costs	109	60
Deferred tax provision	895	1,125	1,748
Other non-cash			11
Changes in operating assets and liabilities:
Accounts receivable	(7,855)	3,107	(4,180)
Prepaid expenses and other current assets	(1,105)	343	(149)
Other assets	45	(52)	262
Accounts payable	(810)	299	(921)
Income taxes payable	2,744	722	(1,625)
Accrued expenses and other current liabilities	(157)	(987)	1,803
Accrued compensation expenses	670	40	(967)
Deferred revenue	1,519	(1,516)	654
Other liabilities	3,175	(162)	(2,372)
Net cash provided by operating activities	18,649	18,345	14,479
Investing activities:
Purchases of property and equipment, and other capitalized assets	(4,137)	(4,410)	(3,699)
Purchases of investments	(500)	(9,766)	(7,891)
Proceeds from sales and maturities of investments	10,900	10,560	6,657
Net cash provided by (used in) investing activities	6,263	(3,616)	(4,933)
Financing activities:
Tax withholdings related to net share settlements	(3,940)	(4,446)	(1,705)
Purchase of treasury shares and related costs	(8,085)	(7,988)	(15,098)
Purchase of shares through tender offer		(40,794)
Registration and other fees	(3)		(20)
Payment of earnout liabilities		(459)
Proceeds from exercise of stock options	942	4,192	2,802
Term loan proceeds		50,000
Debt issuance costs	(50)	(367)
Term loan principal payment	(6,250)	(11,250)
Net cash used in financing activities	(17,386)	(11,112)	(14,021)
Effect of exchange rate changes on cash and cash equivalents	(45)	85	(17)
Net increase (decrease) in cash and cash equivalents	7,481	3,702	(4,492)
Cash and cash equivalents at beginning of period	18,485	14,783	19,275
Cash and cash equivalents at end of period	25,966	18,485	14,783
Supplemental disclosure of cash flow information:
Cash (received) paid for taxes, net	(43)	$ 711	$ 5,369
Property and equipment included in accounts payable and in accrued expenses and other liabilities	$ 959

Organization and Operations

Organization and Operations	12 Months Ended
	Dec. 31, 2017
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Organization and Operations	1. Organization and Operations TechTarget, Inc. and its subsidiaries (the “Company”) is a leading provider of specialized online content for buyers of enterprise information technology (“IT”) products and services, and a leading provider of purchase-intent marketing and sales services for enterprise technology vendors. The Company’s service offerings enable technology vendors to better identify, reach and influence corporate IT decision makers actively researching specific IT purchases. The Company improves vendors’ ability to impact these audiences for business growth using advanced targeting, analytics and data services complemented with customized marketing programs that integrate demand generation and brand advertising techniques. The Company operates a network of over 140 websites, each of which focuses on a specific IT sector such as storage, security or networking. IT and business professionals have become increasingly specialized, and they have come to rely on the Company’s sector-specific websites for purchasing decision support. The Company’s content platform enables IT and business professionals to navigate the complex and rapidly changing IT landscape where purchasing decisions can have significant financial and operational consequences. At critical stages of the purchase decision process, these content offerings through different channels meet IT and business professionals’ needs for expert, peer and IT vendor information and provide a platform on which IT vendors can launch targeted marketing campaigns which generate measurable return on investment. Based upon the logical clustering of members’ respective job responsibilities and the marketing focus of the products being promoted by the Company’s customers, the Company categorizes its content offerings to address the key market opportunities and audience extensions across a portfolio of distinct media groups: Security; Networking; Storage; Data Center and Virtualization Technologies; CIO/IT Strategy; Business Applications and Analytics; Application Architecture and Development; Channel; and TechnologyGuide.com.

Summary of Significant Accounti

Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2017
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	2. Summary of Significant Accounting Policies The accompanying consolidated financial statements reflect the application of certain significant accounting policies as described below and elsewhere in these Notes to Consolidated Financial Statements. Principles of Consolidation The accompanying Consolidated Financial Statements include the accounts of the Company and its wholly-owned subsidiaries, TechTarget Securities Corporation (“TSC”), TechTarget Limited, TechTarget (HK) Limited (“TTGT HK”), TechTarget (Beijing) Information Technology Consulting Co. Ltd. (“TTGT Consulting”), TechTarget (Australia) Pty Ltd., TechTarget (Singapore) Pte Ltd., E-Magine Médias SAS (“LeMagIT”) and TechTarget Germany GmbH. TSC is a Massachusetts corporation. TechTarget Limited is a subsidiary doing business principally in the United Kingdom. TTGT HK is a subsidiary incorporated in Hong Kong in order to facilitate the Company’s activities in the Asia-Pacific region. Additionally, through its wholly-owned subsidiaries, TTGT HK and TTGT Consulting, the Company effectively controls a variable interest entity (“VIE”), Keji Wangtuo Information Technology Co., Ltd., (“KWIT”), which was incorporated under the laws of the People’s Republic of China (“PRC”). In 2018, TechTarget began modifying its PRC operations and consolidating its activities with other TechTarget locations. TechTarget (Australia) Pty Ltd. and TechTarget (Singapore) Pte Ltd. are the entities through which the Company does business in Australia and Singapore, respectively; LeMagIT and TechTarget Germany GmbH, both wholly-owned subsidiaries of TechTarget Limited, are entities through which the Company does business in France and Germany, respectively. PRC laws and regulations prohibit or restrict foreign ownership of Internet-related services and advertising businesses. To comply with these foreign ownership restrictions, the Company operates its websites and provides online advertising services in the PRC through KWIT. The Company entered into certain exclusive agreements with KWIT and its shareholders through TTGT HK, which obligated TTGT HK to absorb all of the risk of loss from KWIT’s activities and entitled TTGT HK to receive all of its residual returns. In addition, the Company entered into certain agreements with the authorized parties through TTGT HK, including Management and Consulting Services, Voting Proxy, Equity Pledge and Option Agreements. TTGT HK assigned all of its rights and obligations to the newly formed wholly foreign-owned enterprise (“WFOE”), TTGT Consulting. TTGT Consulting is established and existing under the laws of the PRC, and is wholly owned by TTGT HK. Based on these contractual arrangements, the Company consolidates the financial results of KWIT as required by Accounting Standards Codification (“ASC”) subtopic 810-10, Consolidation: Overall Reclassifications The adoption of a recent accounting pronouncement, described in more detail in the Accounting Guidance Adopted in 2017 section below, resulted in the Company recording deferred tax assets of approximately $0.2 million with an offsetting entry to retained earnings, as well as a reclassification between Operating Activities and Financing Activities in the Consolidated Statements of Cash Flows of $0.2 million and $3.2 million for the years ended December 31, 2016 and 2015, respectively. There was no effect on the Consolidated Statements of Income and Comprehensive Income. There were no reclassifications out of accumulated other comprehensive income in the years ended December 31, 2017, 2016, or 2015. Use of Estimates The preparation of consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosures of contingent assets and liabilities at the date of the consolidated financial statements and the reported amounts of revenues and expenses during the reporting period. On an ongoing basis, the Company evaluates its estimates, including those related to revenues, long-lived assets, goodwill, the allowance for doubtful accounts, stock-based compensation, earnouts, self-insurance accruals and income taxes. Estimates of the carrying value of certain assets and liabilities are based on historical experience and on various other assumptions that the Company believes to be reasonable. Actual results could differ from those estimates. Revenue Recognition The Company generates substantially all of its revenues from the sale of targeted marketing and advertising campaigns, which are delivered via its network of websites, data analytics solutions, and, historically, events. In all cases, revenue is recognized only when the price is fixed or determinable, persuasive evidence of an arrangement exists, the service is performed and collectability of the resulting receivable is reasonably assured. The majority of the Company’s online media sales involve multiple service and product offerings, which are described in more detail below. Because neither vendor-specific objective evidence of fair value nor third-party evidence of fair value exists for all elements in the Company’s bundled product offerings, the Company uses an estimated selling price which represents management's best estimate of the stand-alone selling price for each deliverable in an arrangement. The Company establishes best estimates considering multiple factors including, but not limited to, class of client, size of transaction, available media inventory, pricing strategies and market conditions. The Company believes the use of the best estimate of selling price allows revenue recognition in a manner consistent with the underlying economics of the transaction. The Company uses the relative selling price method to allocate consideration at the inception of the arrangement to each deliverable in a multiple element arrangement. The relative selling price method allocates any discount in the arrangement proportionately to each deliverable on the basis of the deliverable's best estimate of selling price. Revenue is then recognized as delivery occurs. The Company typically offers standard 30 day cancellation terms under its agreements. The Company evaluates all deliverables of an arrangement at inception and each time an item is delivered, to determine whether they represent separate units of accounting. Based on this evaluation, the arrangement consideration is measured and allocated to each of these elements. Additionally, the Company offers sales incentives to certain customers, primarily in the form of volume rebates, which are classified as a reduction of revenues and are calculated based on the terms of the specific customer’s contract. The Company accrues for these sales incentives based on contractual terms and historical experience. Online Offerings IT Deal Alert™. This suite of products and services includes IT Deal Alert: Qualified Sales Opportunities™, which profiles specific in-progress purchase projects, IT Deal Alert: Priority Engine™, which is a subscription service powered by the Company’s Activity Intelligence™ platform that integrates into salesforce.com and delivers information to allow marketers and sales personnel to identify those accounts who are actively researching new technology purchases, IT Deal Alert: Deal Data™, which is a customized solution aimed at sales intelligence and data scientist functions that makes the Company’s Activity Intelligence data directly consumable by the customer’s internal applications, and IT Deal Alert: TechTarget Research™, which is a subscription product that sources proprietary information about purchase transactions from IT and business professionals who are making and have recently completed these purchases. Qualified Sales Opportunities revenue is recognized when the Qualified Sales Opportunity is delivered to the Company’s customer, Priority Engine revenue is recognized ratably over the duration of the service, Deal Data revenue is recognized upon delivery of the data to the Company’s customer, and Research revenue is recognized when the report is delivered. Core Online. The Company’s core online offerings enable its customers to reach and influence prospective buyers through content marketing programs designed to generate demand for their solutions, and through display advertising and other brand programs that influence consideration by prospective buyers. Demand Solutions. As part of its demand solutions campaign offerings, the Company may guarantee a minimum number of sales leads to be delivered over the course of the campaign. The Company determines the content necessary to achieve performance guarantees. Scheduled end dates of campaigns sometimes need to be extended, pursuant to the terms of the arrangement, to satisfy lead guarantees. The Company estimates a revenue reserve necessary to adjust revenue recognition for extended campaigns. These estimates are based on the Company’s experience in managing and fulfilling these offerings. The customer generally has cancellation privileges which normally require advance notice by the customer and require proportional payment by the customer for the portion of the campaign services provided by the Company. The Company recognizes revenue on duration-based campaigns ratably over the duration of the campaign, which is usually less than six months and recognizes revenue on contracts where pricing is based on cost per lead during the period in which leads are delivered to its customers. Brand Solutions. Brand solutions consist mostly of banner revenue, which is recognized in the period in which the banner impressions, engagements or clicks occur and microsite revenue, which is recognized over the period during which the microsites are live. Custom Content Creation. Custom content revenue is recognized when the creation is completed and delivered to the customer. Other. Includes list rental revenue, which is recognized in the period in which the Company delivers the customer’s content to a list of the Company’s registered members, and revenue from third-party revenue sharing arrangements, which is primarily recognized on a net basis in the period in which the services are performed . Events Revenue from vendor-sponsored events, whether sponsored exclusively by a single vendor or in a multi-vendor sponsored event, is recognized upon completion of the event in the period the event occurs. Historically, the majority of the Company’s events were free to qualified attendees and certain events were based on a paid attendee model, but the Company announced on February 14, 2017 that it would be phasing out its events product line. The Company recognizes revenue for paid attendee events upon completion of the event. Amounts collected or billed prior to satisfying the above revenue recognition criteria are recorded as deferred revenue. The Company excludes from its deferred revenue and accounts receivable balances amounts for which it has billed in advance prior to the start of a campaign or the delivery of services. Fair Value of Financial Instruments Financial instruments consist of cash and cash equivalents, short-term and long-term investments, accounts receivable, accounts payable, long-term debt and contingent consideration. Due to their short-term nature and liquidity, the carrying value of these instruments, with the exception of contingent consideration and long-term debt, approximates their estimated fair values. See Note 3 for further information on the fair value of the Company’s investments. The Company classifies all of its short-term and long-term investments as available-for-sale. Amounts outstanding under the Company’s long-term debt are subject to variable rates of interest based on current market rates, and as such, the Company believes the carrying amount of these obligations approximates fair value. The fair value of contingent consideration was estimated using a discounted cash flow method described in Note 4. Long-Lived Assets , Long-lived assets consist primarily of property and equipment, capitalized software, goodwill and other intangible assets. The Company reviews long-lived assets, including property and equipment and finite intangible assets, for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable. Conditions that would trigger an impairment assessment include, but are not limited to, a significant adverse change in legal factors or business climate that could affect the value of an asset or an adverse action or a significant decrease in the market price. A specifically identified intangible asset must be recorded as a separate asset from goodwill if either of the following two criteria is met: (1) the intangible asset acquired arises from contractual or other legal rights; or (2) the intangible asset is separable. Accordingly, intangible assets consist of specifically identified intangible assets. Goodwill is the excess of any purchase price over the estimated fair value of net tangible and intangible assets acquired. Goodwill and indefinite-lived intangible assets are not amortized but are reviewed annually for impairment or more frequently if impairment indicators arise. Separable intangible assets that are not deemed to have an indefinite life are amortized over their estimated useful lives, which range from five to ten years, using methods of amortization that are expected to reflect the estimated pattern of economic use, and are reviewed for impairment when events or changes in circumstances suggest that the assets may not be recoverable. Consistent with the Company’s determination that it has a single reporting segment, it has been determined that there is a single reporting unit and goodwill is therefore tested for impairment at the entity level. The Company performs its annual test of impairment of goodwill as of December 31st of each year and whenever events or changes in circumstances suggest that the carrying amount may not be recoverable using the two-step process required by ASC 350, Intangibles – Goodwill and Other Based on the aforementioned evaluation, the Company believes that, as of the balance sheet date presented, none of the Company’s goodwill or other long-lived assets was impaired. The Company did not have any intangible assets with indefinite lives as of December 31, 2017 or 2016. Allowance for Doubtful Accounts The Company reduces gross trade accounts receivable for an allowance for doubtful accounts. The allowance for doubtful accounts is the Company’s best estimate of the amount of probable credit losses in its existing accounts receivable. The allowance for doubtful accounts is reviewed on a regular basis, and all past due balances are reviewed individually for collectability. Account balances are charged against the allowance after all means of collection have been exhausted and the potential for recovery is considered remote. Provisions for doubtful accounts are recorded in general and administrative expense. Below is a summary of the changes in the Company’s allowance for doubtful accounts for the years ended December 31, 2017, 2016, and 2015. Balance at Beginning of Year Provision Acquired in Business Combinations Write-offs, Net of Recoveries Balance at End of Year Year ended December 31, 2015 $ 1,014 $ 805 — $ (104 ) $ 1,715 Year ended December 31, 2016 $ 1,715 $ 894 — $ (648 ) $ 1,961 Year ended December 31, 2017 $ 1,961 $ 806 — $ (984 ) $ 1,783 Property and Equipment and Other Capitalized Assets Property and equipment and other capitalized assets are stated at cost. Property and equipment acquired through acquisitions of businesses are initially recorded at fair value. Depreciation is calculated on the straight-line method based on the month the asset is placed in service over the following estimated useful lives: Estimated Useful Life Furniture and fixtures 5 - 10 years Computer equipment and software 3 years Internal-use software and website development costs 3 - 5 years Leasehold improvements Shorter of useful life or remaining duration of lease Property and equipment and other capitalized assets consist of the following: As of December 31, 2017 2016 Furniture and fixtures $ 1,554 $ 988 Computer equipment and software 3,863 3,722 Leasehold improvements 2,887 2,050 Internal-use software and website development costs 26,702 23,782 35,006 30,542 Less: accumulated depreciation and amortization (25,220 ) (21,310 ) $ 9,786 $ 9,232 Depreciation expense was $4.5 million, $4.1 million, and $4.0 million for the years ended December 31, 2017, 2016, and 2015, respectively. Repairs and maintenance charges that do not increase the useful life of the assets are charged to operations as incurred. The Company wrote off approximately $0.6 million, $1.1 million, and $1.3 million of fully depreciated assets that were no longer in service during 2017, 2016, and 2015, respectively. Depreciation expense is classified as a component of operating expense in the Company’s results of operations. Internal-Use Software and Website Development Costs The Company capitalizes costs incurred during the development of its website applications and infrastructure as well as certain costs relating to internal-use software. The Company begins to capitalize costs to develop software and website applications when planning stage efforts are successfully completed, management has authorized and committed project funding, and it is probable that the project will be completed and the software will be used as intended. Judgment is required in determining the point at which various projects enter the state at which costs may be capitalized, in assessing the ongoing value of the capitalized costs and in determining the estimated useful lives over which the costs are amortized, which is generally four years. To the extent that the Company changes the manner in which it develops and tests new features and functionalities related to its websites, assesses the ongoing value of capitalized assets, or determines the estimated useful lives over which the costs are amortized, the amount of website development costs it capitalizes and amortizes in future periods would be impacted. The estimated useful life of costs capitalized is evaluated for each specific project. Capitalized internal-use software and website development costs are reviewed for recoverability whenever events or changes in circumstances indicate that the carrying amount of the asset may not be recoverable. An impairment loss would be recognized only if the carrying amount of the asset is not recoverable and exceeds its fair value. The Company capitalized internal-use software and website development costs of $2.9 million, $2.8 million, and $2.9 million for the years ended December 31, 2017, 2016, and 2015, respectively. Concentrations of Credit Risk and Off-Balance Sheet Risk Financial instruments that potentially expose the Company to concentrations of credit risk consist mainly of cash and cash equivalents, investments and accounts receivable. The Company maintains its cash and cash equivalents and investments principally in accredited financial institutions of high credit standing. The Company routinely assesses the credit worthiness of its customers. The Company generally has not experienced any significant losses related to individual customers or groups of customers in any particular industry or area. The Company does not require collateral. Due to these factors, no additional credit risk beyond amounts provided for collection losses is believed by management to be probable in the Company’s accounts receivable. At December 31, 2017, one customer represented 10% of total accounts receivable. No single customer represented 10% or more of total accounts receivable at December 31, 2016. No single customer accounted for 10% or more of total revenues in the years ended December 31, 2017, 2016, or 2015. Income Taxes The Company’s deferred tax assets and liabilities are recognized based on temporary differences between the financial reporting and income tax bases of assets and liabilities using statutory rates. A valuation allowance is established against net deferred tax assets if, based upon the weight of available evidence, it is more likely than not that some or all of the deferred tax assets will not be realized. The Company records a liability for unrecognized tax benefits resulting from uncertain tax positions taken or expected to be taken in a tax return using a “more likely than not” threshold as required by the provisions of ASC 740-10, Accounting for Uncertainty in Income Taxes The Company recognizes interest and penalties related to unrecognized tax benefits, if any, in income tax expense. Stock-Based Compensation The Company has stock-based employee compensation plans which are more fully described in Note 10. Stock-based compensation cost is measured at the grant date based on the fair value of the award and is recognized in the Consolidated Statement of Income and Comprehensive Income using the straight-line method over the vesting period of the award. The Company uses the Black-Scholes option-pricing model to determine the fair value of stock option awards. Comprehensive Income Comprehensive income includes all changes in equity during a period, except those resulting from investments by stockholders and distributions to stockholders. The Company's comprehensive income includes changes in the fair value of the Company’s unrealized gains on available for sale securities and foreign currency translation adjustments. There were no reclassifications out of accumulated other comprehensive income in the periods ended December 31, 2017, 2016, or 2015. Foreign Currency The functional currency for each of the Company’s subsidiaries is the local currency of the country in which it is incorporated. All assets and liabilities are translated into U.S. dollar equivalents at the exchange rate in effect on the balance sheet date or at a historical rate. Revenues and expenses are translated at average exchange rates. Translation gains or losses are recorded in stockholders’ equity as an element of accumulated other comprehensive loss. Net Income Per Share Basic earnings per share is computed based on the weighted average number of common shares and vested restricted stock units outstanding during the period. Because the holders of unvested restricted stock units do not have nonforfeitable rights to dividends or dividend equivalents, the Company does not consider these restricted stock units to be participating securities that should be included in its computation of earnings per share under the two-class method. Diluted earnings per share is computed using the weighted average number of common shares and vested, undelivered restricted stock units outstanding during the period, plus the dilutive effect of potential future issuances of common stock relating to stock option and restricted stock unit programs using the treasury stock method. In calculating diluted earnings per share, the dilutive effect of stock options and restricted stock units is computed using the average market price for the respective period. In addition, the assumed proceeds under the treasury stock method include the average unrecognized compensation expense of stock options and restricted stock units that are in-the-money. This results in the “assumed” buyback of additional shares, thereby reducing the dilutive impact of stock options and restricted stock units. A reconciliation of the numerator and denominator used in the calculation of basic and diluted net income per share is as follows: For the Years Ended December 31, 2017 2016 2015 Numerator: Net income $ 6,803 $ 2,419 $ 7,186 Denominator: Basic: Weighted average shares of common stock and vested, undelivered restricted stock units outstanding 27,550,044 29,953,798 32,963,185 Diluted: Weighted average shares of common stock and vested, undelivered restricted stock units outstanding 27,550,044 29,953,798 32,963,185 Effect of potentially dilutive shares 721,340 819,734 1,512,620 Total weighted average shares of common stock and vested, undelivered restricted stock units outstanding and potentially dilutive shares 28,271,384 30,773,532 34,475,805 Calculation of Net Income Per Common Share: Basic: Net income applicable to common stockholders $ 6,803 $ 2,419 $ 7,186 Weighted average shares of stock outstanding 27,550,044 29,953,798 32,963,185 Net income per common share $ 0.25 $ 0.08 $ 0.22 Diluted: Net income applicable to common stockholders $ 6,803 $ 2,419 $ 7,186 Weighted average shares of stock outstanding 28,271,384 30,773,532 34,475,805 Net income per common share(1) $ 0.24 $ 0.08 $ 0.21 (1) In calculating diluted earnings per share, 0.7 million, 1.3 million, and 1.1 million shares related to outstanding stock options and unvested, undelivered restricted stock units were excluded for the years ended December 31, 2017, 2016, and 2015, respectively, because they were anti-dilutive. Recent Accounting Pronouncements Accounting Guidance Adopted in 2017 In March 2016, the Financial Accounting Standards Board (“FASB”) issued ASU No. 2016-09, Compensation-Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting (“ASU 2016-09”). The updated guidance changes how companies account for certain aspects of share-based payment awards to employees, including the accounting for income taxes, forfeitures, and statutory tax withholding requirements, as well as classification in the Consolidated Statements of Cash Flows. ASU 2016-09 is effective for fiscal years beginning after December 15, 2016, including interim periods within those fiscal years. The Company adopted the provisions of the new standard on January 1, 2017. Implementing the new pronouncement resulted in the Company recognizing tax benefits and tax deficiencies related to stock compensation deductions as a component of the provision for income tax expense in the reporting period in which they occur. Additionally, the company has applied the modified retrospective adoption approach, which resulted in the Company recording deferred tax assets of approximately $0.2 million with an offsetting entry to retained earnings. ASU 2016-09 also requires the presentation of excess tax benefit from stock options as an operating activity on the Consolidated Statements of Cash Flows instead of as a financing activity, which resulted in a reclassification of $0.2 million and $3.2 million in the Consolidated Statement of Cash Flows for the years ended December 31, 2016 and 2015, respectively. Accounting Guidance Not Yet Adopted as of December 31, 2017 In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers (Topic 606) (“ASU 2014-09”), which supersedes the revenue recognition requirements in ASC 605, Revenue Recognition. ASU 2014-09 is based on the principle that revenue is recognized to depict the transfer of 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. ASU 2014-09 also requires additional disclosure about the nature, amount, timing and uncertainty of revenue and cash flows arising from customer contracts, including significant judgments and changes in judgments and assets recognized from costs incurred to obtain or fulfill a contract. The standard may be applied retrospectively to each prior period presented, or using the modified retrospective approach, with the cumulative effect recognized as of the date of initial application. The Company will adopt the standard effective January 1, 2018, using the modified retrospective approach. The Company does not anticipate any material changes as a result of adopting the standard. The Company will complete the remainder of its evaluation during the first quarter of fiscal 2018. The Company is also evaluating the impact the standard will have on its disclosures, which will be much more extensive under the new standard, and is implementing changes to its current policies, practices, and internal controls over financial reporting to address the requirements of the standard. In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842) (“ASU 2016-02”). ASU 2016-02 establishes a right-of-use (“ROU”) model that requires a lessee to record a ROU asset and a lease liability on the balance sheet for all leases with terms longer than 12 months. Leases will be classified as either finance or operating, with classification affecting the pattern of expense recognition in the income statement. ASU 2016-02 is effective for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. A modified retrospective transition approach is required for lessees for capital and operating leases existing at, or entered into after, the beginning of the earliest comparative period presented in the financial statements, with certain practical expedients available. The Company is currently evaluating the impact that this guidance will have on its consolidated financial statements and disclosure. In January 2017, the FASB issued ASU No. 2017-04, Intangibles-Goodwill and Other (Topic 350), Simplifying the Test for Goodwill Impairment ("ASU 2017-04"). ASU 2017-04 eliminates the requirement to calculate the implied fair value of goodwill to measure a goodwill impairment charge (step 2 of the goodwill impairment test) and instead requires only a one-step quantitative impairment test, performed by comparing the fair value of goodwill with its carrying amount. ASU 2017-04 is effective on a prospective basis effective for goodwill impairment tests in fiscal years beginning after December 15, 2019. Early adoption is permitted for goodwill impairment tests performed on testing dates after January 1, 2017. The Company is currently evaluating the impact that this guidance will have on its consolidated financial statements and disclosures.

Fair Value Measurements

Fair Value Measurements	12 Months Ended
	Dec. 31, 2017
Fair Value Disclosures [Abstract]
Fair Value Measurements	3. Fair Value Measurements The Company measures certain financial assets and liabilities at fair value on a recurring basis, including cash equivalents, short-term and long-term investments and contingent consideration. The fair value of these financial assets and liabilities was determined based on three levels of input as follows: • Level 1. Quoted prices in active markets for identical assets and liabilities; • Level 2. Observable inputs other than quoted prices in active markets; and • Level 3. Unobservable inputs. The fair value hierarchy of the Company’s financial assets and liabilities carried at fair value and measured on a recurring basis is as follows: Fair Value Measurements at Reporting Date Using December 31, 2017 Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Assets: Money market funds(1) $ 7,155 $ 7,155 $ — $ — Short-term investments(2) 7,650 — 7,650 — Long-term investments(2) 496 — 496 — Total assets $ 15,301 $ 7,155 $ 8,146 $ — Fair Value Measurements at Reporting Date Using December 31, 2016 Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Assets: Money market funds(1) $ 4,301 $ 4,301 $ — $ — Short-term investments(2) 10,988 — 10,988 — Long-term investments(2) 7,801 — 7,801 — Total assets $ 23,090 $ 4,301 $ 18,789 $ — (1) Included in cash and cash equivalents on the accompanying consolidated balance sheets; valued at quoted market prices in active markets. (2) Short-term and long-term investments consist of municipal bonds, corporate bonds, U.S. Treasury securities, and government agency bonds; their fair value is calculated using an interest rate yield curve for similar instruments.

Acquisition

Acquisition	12 Months Ended
	Dec. 31, 2017
Business Combinations [Abstract]
Acquisition	4. Acquisition LeMagIT On December 17, 2012, the Company purchased all of the outstanding shares of its French partner, E-Magine Médias SAS (“LeMagIT”), for approximately $2.2 million in cash plus a potential future earnout valued at $0.7 million at the time of the acquisition. Approximately $1.2 million of the cash payment was made at closing, and the remainder was paid in two equal installments in 2013 and 2014. The earnout was subject to certain revenue growth targets and the payment was adjusted each period based on actual results. In valuing the contingent consideration, it was determined that fair value adjustments were necessary to appropriately reflect the inherent risk and related time value of money associated with these potential payments. Accordingly, a discount rate of 28% was used. The calculation of these fair values required the use of significant inputs that are not observable in the market and thus represented a Level 3 fair value measurement as defined in ASC 820, Fair Value Measurements and Disclosures The earnout payment of $1.3 million, net of a $0.4 million holdback, was paid in January 2016. The portion of the payment that related to the fair value of the earnout as of the acquisition date, amounting to approximately $0.5 million, is reflected in financing activities in the Company’s Consolidated Statement of Cash Flows for the year ended December 31, 2016. The payment is reflected as an operating cash flow. The holdback was subsequently settled with the stockholders in October 2016.

Cash, Cash Equivalents and Inve

Cash, Cash Equivalents and Investments	12 Months Ended
	Dec. 31, 2017
Cash And Cash Equivalents [Abstract]
Cash, Cash Equivalents and Investments	5. Cash, Cash Equivalents and Investments Cash and cash equivalents consist of highly liquid investments with maturities of three months or less at date of purchase. Cash equivalents are carried at cost, which approximates their fair market value. Cash and cash equivalents consisted of the following: As of December 31, 2017 2016 Cash $ 18,811 $ 14,184 Money market funds 7,155 4,301 Total cash and cash equivalents $ 25,966 $ 18,485 The Company’s short-term and long-term investments are accounted for as available for sale securities. These investments are recorded at fair value with the related unrealized gains and losses included in accumulated other comprehensive loss, a component of stockholders’ equity, net of tax. The cumulative unrealized loss, net of taxes, was $17, $30 and $19 as of December 31, 2017, 2016, and 2015, respectively. Realized gains and losses on the sale of these investments are determined using the specific identification method. There were no realized gains or losses in 2017, 2016, or 2015. Short-term and long-term investments consisted of the following: December 31, 2017 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Estimated Fair Value Short-term and long-term investments: U.S. Treasury securities $ 1,499 $ — $ (6 ) $ 1,493 Government agency bonds 1,003 — (4 ) $ 999 Municipal bonds 4,169 — (14 ) $ 4,155 Corporate bonds 1,502 — (3 ) $ 1,499 Total short-term and long-term investments $ 8,173 $ — $ (27 ) $ 8,146 December 31, 2016 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Estimated Fair Value Short-term and long-term investments: U.S. Treasury securities $ 1,998 $ — $ (1 ) $ 1,997 Government agency bonds 5,012 1 (2 ) 5,011 Municipal bonds 9,817 — (42 ) 9,775 Corporate bonds 2,009 — (3 ) 2,006 Total short-term and long-term investments $ 18,836 $ 1 $ (48 ) $ 18,789 The Company had 15 debt securities in an unrealized loss position at December 31, 2017. All of these securities have been in such a position for no more than seventeen months. The unrealized loss on those securities was approximately $27 and the fair value was $8.1 million. At December 31, 2016, the Company had 21 debt securities in an unrealized loss position, and the unrealized loss on those securities was approximately $48 and the fair value was $13.8 million at that date. The Company uses specific identification when reviewing these investments for impairment. Because the Company does not intend to sell the investments that are in an unrealized loss position and it is not likely that the Company will be required to sell any investments before recovery of their cost basis, the Company does not consider those investments with an unrealized loss to be other-than-temporarily impaired at December 31, 2017. Municipal, government agency, and corporate bonds have contractual maturity dates that range from January 2018 to January 2019. All income generated from these investments is recorded as interest income.

Goodwill

Goodwill	12 Months Ended
	Dec. 31, 2017
Goodwill And Intangible Assets Disclosure [Abstract]
Goodwill	6. Goodwill The changes in the carrying amount of goodwill for the years ended December 31, 2017 and 2016 are as follows: As of December 31, 2017 2016 Balance as of beginning of year $ 93,469 $ 93,701 Effect of exchange rate changes 324 (232 ) Balance as of end of year $ 93,793 $ 93,469

Intangible Assets

Intangible Assets	12 Months Ended
	Dec. 31, 2017
Goodwill And Intangible Assets Disclosure [Abstract]
Intangible Assets	7. Intangible Assets The following table summarizes the Company’s intangible assets, net: As of December 31, 2017 Estimated Useful Lives (Years) Gross Carrying Amount Accumulated Amortization Net Customer, affiliate and advertiser relationships 5 $ 6,938 $ (6,938 ) $ — Developed websites, technology and patents 10 1,342 (907 ) 435 Trademark, trade name and domain name 8 1,802 (1,731 ) 71 Proprietary user information database and internet traffic 5 1,202 (1,202 ) — Total intangible assets $ 11,284 $ (10,778 ) $ 506 As of December 31, 2016 Estimated Useful Lives (Years) Gross Carrying Amount Accumulated Amortization Net Customer, affiliate and advertiser relationships 5-9 $ 6,826 $ (6,807 ) $ 19 Developed websites, technology and patents 10 1,178 (705 ) 473 Trademark, trade name and domain name 5-8 1,749 (1,664 ) 85 Proprietary user information database and internet traffic 5 1,146 (1,122 ) 24 Total intangible assets $ 10,899 $ (10,298 ) $ 601 Intangible assets are amortized over their estimated useful lives, which range from five to ten years, using methods of amortization that are expected to reflect the estimated pattern of economic use. The remaining amortization expense will be recognized over a weighted average period of approximately 3.07 years. Amortization expense was $0.2 million, $0.8 million, and $1.4 million for the years ended December 31, 2017, 2016, and 2015, respectively. Amortization expense is recorded within operating expenses as the intangible assets consist of customer-related assets and website traffic that the Company considers to be in support of selling and marketing activities. The Company did not write off any intangible assets in 2017. The Company wrote off $0.1 million of fully amortized intangible assets in 2016. The Company expects amortization expense of intangible assets to be as follows: Years Ending December 31: Amortization Expense 2018 111 2019 93 2020 79 2021 96 2022 127 $ 506

Term Loan Agreement and Prior C

Term Loan Agreement and Prior Credit Agreement	12 Months Ended
	Dec. 31, 2017
Debt Disclosure [Abstract]
Term Loan Agreement and Prior Credit Agreement	8. Term Loan Agreement and Prior Credit Agreement On May 9, 2016, the Company entered into a Senior Secured Credit Facilities Credit Agreement for a term loan (the “Term Loan Agreement”). Under the Term Loan Agreement, the Company borrowed and received $50.0 million in aggregate principal amount pursuant to a five-year term loan (the “Term Loan”). The borrowings under the Term Loan Agreement are secured by a lien on substantially all of the assets of the Company, including a pledge of the stock of certain of its wholly-owned subsidiaries. On June 22, 2017, the Company entered into a First Amendment to the Term Loan Agreement (the “First Amendment”). The First Amendment amended the existing Term Loan Agreement by, among other things, modifying the consolidated leverage ratio covenant and the liquidity requirement related to capital stock repurchases. Upon effectiveness of the First Amendment, the Company’s total consolidated leverage ratio (calculated in accordance with the Term Loan Agreement) could not be greater than 2.50 to 1.00 until the quarter ending March 31, 2018, with stepdowns thereafter to a maximum ratio of 1.50 to 1.00 for quarters ending on or after March 31, 2020. In addition, the minimum liquidity requirement (calculated in accordance with the Term Loan Agreement) with respect to any capital stock repurchased using borrowings under the Term Loan Agreement was increased from $10.0 million to $15.0 million. Borrowings under the Term Loan Agreement must be repaid quarterly in the following manner: 2.5% of the initial aggregate borrowings are due and payable each quarter for the first loan year and 5.0% of the initial aggregate borrowings are due and payable each quarter during each subsequent loan year. At maturity in May 2021, any remaining amounts outstanding under the Term Loan Agreement will be due and payable. Expected future installment payments on the principal by year and amounts included in the Company’s Consolidated Balance Sheet as of December 31, 2017 related to the Term Loan Agreement are as follows: Years Ending December 31: 2018 10,000 2019 10,000 2020 10,000 2021 2,500 2022 — Total principal on term loan 32,500 Unamortized debt issuance costs (273 ) Carrying amount of term loan 32,227 Less: current portion of term loan, net of $112 in unamortized debt issuance costs (9,888 ) Long-term portion of term loan, net of $161 in unamortized debt issuance costs $ 22,339 The Term Loan Agreement requires the Company to maintain compliance with certain covenants, including leverage and fixed charge coverage ratio covenants. At December 31, 2017, the Company was in compliance with all covenants under the Term Loan Agreement. At the Company’s option, the Term Loan Agreement bears interest at either an annual rate of 1.50% plus the higher of (a) the Prime Rate in effect on such day and (b) the Federal Funds Effective Rate in effect on such day plus 0.50%, or the London Interbank Offered Rate (“LIBOR”) plus 2.50%. The applicable interest rate was 4.11% at December 31, 2017, representing LIBOR plus the applicable margin of 2.50%. Interest expense under the Term Loan Agreement was $1.4 million and $1.1 million in 2017 and 2016, respectively, which includes non-cash interest expense of $0.1 million and $60 in 2017 and 2016, respectively, related to the amortization of deferred issuance costs. During 2017, the Company made principal payments totaling $6.3 million. During 2016, the Company made principal payments totaling $11.3 million which included a $10.0 million pre-payment in excess of the contractual amounts due. Borrowings under the Term Loan Agreement may be prepaid by the Company at its option without penalty and must be repaid upon the occurrence of certain events, including certain events of default. The Company paid a one-time upfront administration and arrangement fee on the closing date. Thereafter, a non-refundable fee will be due and payable on each anniversary of the effective date of the Term Loan Agreement. Total debt issuance costs paid in relation to the Term Loan Agreement were approximately $0.4 million. The costs were recorded as a direct deduction from the carrying amount of the Term Loan and amortized as interest expense over the life of the Term Loan Agreement on a straight-line basis, which approximates the effective interest method. The Company used a portion of the proceeds from the Term Loan to fund a tender offer (the “Tender Offer”) to purchase up to 8.0 million of its shares of common stock, which commenced on May 10, 2016 and was concluded on June 8, 2016 (see Note 11). The Company intends to use the remaining proceeds to fund stock repurchases pursuant to its Stock Repurchase Program (see Note 11), as well as for general corporate purposes.

Commitments and Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2017
Commitments And Contingencies Disclosure [Abstract]
Commitments and Contingencies	9. Commitments and Contingencies Operating Leases The Company conducts its operations in leased office facilities under various noncancelable operating lease agreements that expire through December 2029. On October 26, 2017, the Company and Hines Global REIT Riverside Center, LLC (“Hines”) entered into a Third Amendment (the “Third Amendment”) to the lease agreement for office space in Newton, Massachusetts, dated as of August 4, 2009, by and between the Company and MA-Riverside Project, L.L.C. (predecessor-in-interest to Hines) as amended (the “Newton Lease”). The Third Amendment extends the lease term to December 31, 2029 and preserves the Company’s option to extend the term for an additional five-year period subject to certain terms and conditions set forth in the Newton Lease. The Third Amendment reduces the rentable space from approximately 110,000 square feet to approximately 74,000 square feet effective January 1, 2018 and provides the Company with a one-time cash allowance of up to $3.3 million, which may be used by the Company for any purpose. Beginning on January 1, 2018, base monthly rent under the Third Amendment will be $0.3 million. The base rent will increase biennially at a rate averaging approximately 1% per year, beginning on January 1, 2020. The Company remains responsible for certain other costs under the Third Amendment, including operating expense and taxes. The Newton Lease contains rent concessions, which the Company is receiving over the life of the Newton Lease. Certain of the Company’s operating leases include lease incentives and escalating payment amounts and are renewable for varying periods. The Company is recognizing the related rent expense on a straight-line basis over the term of each lease, taking into account the lease incentives and escalating lease payments. Total rent expense under the Company’s leases was approximately $4.5 million, $4.4 million, and $3.9 million for the years ended December 31, 2017, 2016, and 2015, respectively. Future minimum lease payments under the Company’s noncancelable operating leases at December 31, 2017 are as follows: Years Ending December 31: Minimum Lease Payments 2018 4,230 2019 4,118 2020 3,640 2021 3,745 2022 3,397 Thereafter 24,664 $ 43,794 Litigation From time to time and in the ordinary course of business, the Company may be subject to various claims, charges, and litigation. At December 31, 2017 and 2016, the Company did not have any pending claims, charges, or litigation that it expects would have a material adverse effect on its consolidated financial position, results of operations, or cash flows.

Stock-Based Compensation

Stock-Based Compensation	12 Months Ended
	Dec. 31, 2017
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Stock-Based Compensation	10. Stock-Based Compensation Stock Option and Incentive Plans In September 1999, the Company approved a stock option plan (the “1999 Plan”) that provided for the issuance of shares of common stock incentives. The 1999 Plan provided for the granting of incentive stock options (“ISOs”), nonqualified stock options (“NSOs”), and stock grants. These incentives were offered to the Company’s employees, officers, directors, consultants, and advisors. Each option is exercisable at such times and subject to such terms as determined by the Company’s Board of Directors (the “Board”); grants generally vest over a four-year period, and expire no later than ten years after the grant date. In April 2007, the Board approved the 2007 Stock Option and Incentive Plan (the “2007 Plan”), which was approved by the stockholders of the Company and became effective upon the consummation of the Company’s IPO in May 2007. Effective upon the consummation of the IPO, no further awards were made pursuant to the 1999 Plan, but any outstanding awards under the 1999 Plan remain in effect and continue to be subject to the terms of the 1999 Plan. The 2007 Plan allows the Company to grant ISOs, NSOs, stock appreciation rights, deferred stock awards, restricted stock units and other awards. Under the 2007 Plan, stock options could not be granted at less than fair market value on the date of grant, and grants generally vest over a three to four-year period. Stock options granted under the 2007 Plan expire no later than ten years after the grant date. Additionally, beginning with awards made in August 2015, the Company had the option to direct a net issuance of shares for satisfaction of tax liability with respect to vesting of awards and delivery of shares. Prior to August 2015, this choice of settlement method was solely at the discretion of the award recipient. At the inception of the plan, the Company reserved for issuance an aggregate of 2,911,667 shares of common stock under the 2007 Plan, which expired in May 2017. The 2007 Plan was subject to an automatic annual increase of shares on January 1 of each year, beginning on January 1, 2008, equal to the lesser of (a) 2% of the outstanding number of shares of common stock (on a fully-diluted basis) on the immediately preceding December 31 and (b) such lower number of shares as may be determined by the compensation committee of the Board. The number of shares available for issuance under the 2007 Plan was subject to adjustment in the event of a stock split, stock dividend or other change in capitalization. Additionally, shares that were subject to stock options that returned to the 1999 Plan as a result of their expiration, cancellation, or termination were automatically made available for issuance under the 2007 Plan. Approximately 8,224,334 shares were added to the 2007 Plan in accordance with the automatic annual increase and 1999 Plan return provisions. No new awards may be granted under the 2007 Plan; however, the shares of common stock remaining in the 2007 Plan are available for issuance in connection with previously awarded grants under the 2007 Plan. There are 1,171,840 shares of common stock, including 93,750 vested restricted stock units, that remain subject to outstanding stock grants under the 2007 Plan as of December 31, 2017. In March 2017, the Board approved the 2017 Stock Option and Incentive Plan (the “2017 Plan”), which was approved by the stockholders of the Company at the 2017 Annual Meeting and became effective June 16, 2017. The 2017 Plan replaces the Company’s 2007 Plan. On that date, approximately 3,000,000 shares of Common Stock were reserved for issuance under the 2017 Plan and, generally, shares that are forfeited or canceled from awards under the 2017 Plan also will be available for future awards. Under the 2017 Plan, the Company may grant restricted stock and restricted stock units, non-qualified stock options, stock appreciation rights, performance awards, and other stock-based and cash-based awards. Grants generally vest in equal tranches over a three-year period. Stock options granted under the 2017 Plan expire no later than ten years after the grant date. Shares of stock issued pursuant to restricted stock awards are restricted in that they are not transferable until they vest. Stock underlying awards of restricted stock units are not issued until the units vest. Non-qualified stock options cannot be exercised until they vest. Under the 2017 Plan, all stock options and stock appreciation rights must be granted with an exercise price that is at least equal to the fair market value of the stock on the date of grant. The 2017 Plan broadly prohibits the repricing of options and stock appreciation rights without stockholder approval and requires that no dividends or dividend equivalents be paid with respect to options or stock appreciation rights. The 2017 Plan further provides that, in the event any dividends or dividend equivalents are declared with respect to restricted stock, restricted stock units, other stock-based awards and performance awards (referred to as “full-value awards”), they would be subject to the same vesting and forfeiture provisions as the underlying award. There is a total of 680,000 shares of common stock that remain subject to outstanding stock grants under the 2017 Plan as of December 31, 2017. Accounting for Stock-Based Compensation The Company uses the Black-Scholes option pricing model to calculate the grant-date fair value of an award. The Company calculated the fair values of the options granted using the following estimated weighted-average assumptions: Years Ended December 31, 2017 2016 2015 Expected volatility 43 % 46 % 47 % Expected term 6 years 6 years 6 years Risk-free interest rate 1.87 % 1.90 % 1.67 % Expected dividend yield — % — % — % Weighted-average grant date fair value per share $ 4.61 $ 3.91 $ 3.72 The expected volatility of options granted has been determined using a weighted average of the historical volatility of the Company’s stock for a period equal to the expected life of the option. The expected life of options has been determined utilizing the “simplified” method. The risk-free interest rate is based on a zero coupon U.S. treasury instrument whose term is consistent with the expected life of the stock options. The Company has not paid and does not anticipate paying cash dividends on its shares of common stock; therefore, the expected dividend yield is assumed to be zero. The Company applied an estimated annual forfeiture rate based on historical averages in determining the expense recorded in each period. A summary of the stock option activity under the Company’s stock option plans for the year ended December 31, 2017 is presented below: Options Outstanding Weighted-Average Exercise Price Per Share Weighted-Average Remaining Contractual Term in Years Aggregate Intrinsic Value Options outstanding at December 31, 2016 861,380 $ 9.42 Granted 20,000 10.33 Exercised (169,276 ) 5.56 Forfeited — — Canceled (368,014 ) 14.06 Options outstanding at December 31, 2017 344,090 $ 6.41 3.09 $ 2,585 Options exercisable at December 31, 2017 324,090 $ 6.16 2.69 $ 2,514 Options vested or expected to vest at December 31, 2017 342,130 $ 6.39 3.05 $ 2,578 During the years ended December 31, 2017, 2016, and 2015, the total intrinsic value of options exercised (i.e. the difference between the market price of the underlying stock at exercise and the price paid by the employee to exercise the options) was $0.9 million, $1.9 million, and $1.7 million, respectively, and the total amount of cash received by the Company from exercise of these options was $0.9 million, $4.2 million, and $2.8 million, respectively. Restricted Stock Unit Awards Restricted stock unit awards are valued at the market price of a share of the Company’s common stock on the date of the grant. A summary of the restricted stock unit award activity under the Company’s plans for the year ended December 31, 2017 is presented below: Shares Weighted-Average Grant Date Fair Value Per Share Aggregate Intrinsic Value Nonvested outstanding at December 31, 2016 1,640,790 $ 8.54 Granted 676,217 9.93 Vested (866,007 ) 8.20 Forfeited (37,000 ) 9.88 Nonvested outstanding at December 31, 2017 1,414,000 $ 9.37 $ 19,683 The total grant-date fair value of restricted stock unit awards that vested during the years ended December 31, 2017, 2016, and 2015 was $7.1 million, $7.4 million, and $7.2 million, respectively. As of December 31, 2017, there was $11.1 million of total unrecognized compensation expense related to stock options and restricted stock units, which is expected to be recognized over a weighted average period of 1.9 years.

Stockholders' Equity

Stockholders' Equity	12 Months Ended
	Dec. 31, 2017
Equity [Abstract]
Stockholders' Equity	11. Stockholders’ Equity Tender Offer On May 10, 2016, the Company commenced a Tender Offer to purchase up to 8.0 million shares of its common stock, representing approximately 24.8% of the shares of TechTarget’s common stock issued and outstanding at that time, at a price of $7.75 per share. The Tender Offer expired on June 8, 2016. In accordance with the terms of the Tender Offer, the Company accepted for purchase 5,237,843 shares of its common stock for a purchase price of $7.75 per share, or a total of $40.6 million. Repurchased shares were recorded under the cost method and are reflected as treasury stock in the accompanying Consolidated Balance Sheets. The total cost of the Tender Offer was $40.8 million, which included approximately $0.2 million in costs directly attributable to the purchase of shares pursuant to the Tender Offer. In connection with the tender offer, TCV V, L.P., TCV Member Fund, L.P. (along with TCV V, L.P., referred to as the “TCV Funds”) and TCV Management 2004, L.L.C. (“TCM 2004”), each a related party, collectively tendered 3,379,249 shares of the Company’s common stock in the aggregate. Jay Hoag, a member of the Company’s Board of Directors at the time of the Tender Offer, was also a member of the general partner of the TCV Funds and a member of TCM 2004, which at the time was estimated to hold more than 5% of the voting securities of the Company. Additionally, Rogram LLC, a related party, tendered 308,713 shares in connection with the Tender Offer. Roger Marino, a member of the Company’s Board of Directors, indirectly controls shares in Rogram LLC. Common Stock Repurchase Programs In June 2016, the Company announced that the Board had authorized a $20.0 million stock repurchase program (the “June 2016 Repurchase Program”), whereby the Company was authorized to repurchase the Company’s common stock from time to time on the open market or in privately negotiated transactions at prices and in the manner that may be determined by the Board. Pursuant to the June 2016 Repurchase Program, the Company repurchased 749,437 and 980,329 shares of common stock for an aggregate purchase price of $8.1 million and $8.0 million in 2017 and 2016, respectively. On May 5, 2017, the Board reauthorized the June 2016 Repurchase Program to allow the Company to use the remaining balance of the unused authorization under such program after its original expiration date in June 2017. The reauthorized program allows the Company to repurchase its common stock from time to time on the open market or in privately negotiated transactions at prices and in the manner that may be determined by management. The reauthorized program does not expire and may be suspended at any time. For all or a portion of the authorized repurchase amount, the Company may enter into one or more plans that are compliant with Rule 10b5-1 of the Securities Exchange Act of 1934 that are designed to facilitate these purchases. As of December 31, 2017, the Company had $4.0 million remaining for purchases under the stock repurchase plan. In February 2016, the Company announced that the Board had authorized a $20.0 million stock repurchase program (the “February 2016 Repurchase Program”), whereby the Company was authorized to repurchase the Company’s common stock from time to time on the open market or in privately negotiated transactions. The February 2016 Repurchase Program was canceled on May 3, 2016 in connection with the Tender Offer noted above. The Company did not repurchase any shares of common stock pursuant to the February 2016 Repurchase Program. In August 2014, the Company announced that the Board had authorized a $20.0 million stock repurchase program (the “2014 Repurchase Program”), whereby the Company was authorized to repurchase the Company’s common stock from time to time on the open market or in privately negotiated transactions. In May 2015, the Board amended the program to authorize an additional $10.0 million to be used for such purchases. During 2015, the Company repurchased 1,671,687 shares of common stock for an aggregate purchase price of $15.0 million pursuant to the 2014 Repurchase Program. The 2014 Repurchase Program expired on December 31, 2015. Repurchased shares are recorded under the cost method and are reflected as treasury stock in the accompanying Consolidated Balance Sheets. All repurchased shares were funded with cash on hand or proceeds from the Term Loan Agreement (see Note 8). Reserved Common Stock As of December 31, 2017, the Company has reserved 8,584,689 shares of common stock for use in settling outstanding options and unvested restricted stock units that have not been issued, as well as future awards available for grant under the 2017 Plan.

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Income Taxes	12. Income Taxes Income before provision for income taxes was as follows: Years Ended December 31, 2017 2016 2015 U.S. $ 9,435 $ 3,351 $ 11,040 Foreign 282 1,666 881 Income before income taxes $ 9,717 $ 5,017 11,921 The income tax provision for the years ended December 31, 2017, 2016, and 2015 consisted of the following: Years Ended December 31, 2017 2016 2015 Current: Federal $ 1,543 $ 1,627 $ 2,500 State 419 (569 ) 167 Foreign 57 415 320 Total current 2,019 1,473 2,987 Deferred: Federal 598 1,592 796 State 382 (21 ) 796 Foreign (85 ) (446 ) 156 Total deferred 895 1,125 1,748 $ 2,914 $ 2,598 $ 4,735 On December 22, 2017, the Tax Cuts and Jobs Act of 2017 (“the Act”) was signed into law making significant changes to the Internal Revenue Code. Changes include, but are not limited to, a corporate tax rate decrease from 35% to 21% effective for tax years beginning after December 31, 2017 and a one-time transition tax on the mandatory deemed repatriation of cumulative foreign earnings as of December 31, 2017. We have calculated our best estimate of the impact of the Act in our year end income tax provision in accordance with our understanding of the Act and guidance available as of the date of this filing and as a result have recorded $0.4 million as additional income tax benefit in the fourth quarter of 2017, the period in which the legislation was enacted. The amount related to the remeasurement of certain deferred tax assets and liabilities, based on the rates at which they are expected to reverse in the future, was a benefit of $0.4 million. The provisional amount related to the one-time transition tax on the mandatory deemed repatriation of foreign earnings was $45 thousand, based on cumulative foreign earnings net of deficits of $0.9 million. On December 22, 2017, Staff Accounting Bulletin No. 118 (“SAB 118”) was issued to address the application of US GAAP in situations when a registrant does not have the necessary information available, prepared or analyzed (including computations) in reasonable detail to complete the accounting for certain income tax effects of the Act. In accordance with SAB 118, the Company has determined that the $45 thousand of current tax expense recorded in connection with the transition tax on the mandatory deemed repatriation of foreign earnings was a provisional amount and a reasonable estimate at December 31, 2017. Additional investigation is necessary to do a more detailed analysis of historical foreign earnings as well as potential correlative adjustments. Any subsequent adjustment to the amount will be recorded to current tax expense in the quarter of 2018 when the analysis is complete. The income tax provision for the years ended December 31, 2017, 2016, and 2015 differs from the amounts computed by applying the statutory federal income tax rate to the consolidated income before provision for income taxes as follows: Years Ended December 31, 2017 2016 2015 Provision computed at statutory rate $ 3,401 $ 1,757 $ 4,172 Increase resulting from: Difference in rates for foreign jurisdictions 37 (146 ) (181 ) Tax exempt interest income (12 ) (21 ) (6 ) Stock-based compensation (304 ) 315 (430 ) Other non-deductible expenses (101 ) 67 14 Non-deductible officers compensation 447 738 408 State income tax provision 653 (380 ) 573 Losses not benefitted 4 1 9 Subsidiary earnings taxed in the US 127 253 — True-up of prior year returns (161 ) 11 197 Research and development credit (801 ) — — Tax Cuts and Jobs Act of 2017 (376 ) — — Other — 3 (21 ) Provision for income taxes $ 2,914 $ 2,598 $ 4,735 Significant components of the Company’s net deferred tax assets and liabilities are as follows: As of December 31, 2017 2016 Deferred tax assets: Net operating loss carryforwards $ 166 $ 308 Deferred revenue 187 187 Accruals and allowances 972 1,721 Stock-based compensation 815 1,656 Deferred rent expense 1,327 809 Other 4 — Gross deferred tax assets 3,471 4,681 Less valuation allowance (352 ) (443 ) Total deferred tax assets 3,119 4,238 Deferred tax liabilities: Intangible asset amortization (2,036 ) (1,865 ) Depreciation (1,823 ) (2,434 ) Total deferred tax liabilities (3,859 ) (4,299 ) Net deferred tax liabilities $ (740 ) $ (61 ) As reported: Non-current deferred tax assets $ 98 $ 139 Non-current deferred tax liabilities $ (838 ) $ 200 In evaluating the ability to realize the net deferred tax liability, the Company considers all available evidence, both positive and negative, including past operating results, the existence of cumulative losses in the most recent fiscal years, tax planning strategies that are prudent and feasible, and forecasts of future taxable income. In considering sources of future taxable income, the Company makes certain assumptions and judgments which are based on the plans and estimates used to manage the underlying business of the Company. Changes in the Company’s assumptions and estimates, as well as changes in tax rates, may materially impact income tax expense for the period. The Company remeasured deferred assets and liabilities at the applicable tax rate of 21% in accordance with the Act. The remeasurement resulted in a net decrease in these assets and liabilities of $0.4 million. The deferred tax assets relating to the foreign net operating losses (“NOLs”) are fully offset by a valuation allowance. The valuation allowance of $0.4 million at each of December 31, 2017 and 2016 relates primarily to foreign NOLs that the Company determined were not more likely than not to be realized based on projections of future taxable income in China and Hong Kong. The valuation allowance decreased by $91, $85, and $686 during the years ended December 31, 2017, 2016, and 2015, respectively. To the extent realization of the deferred tax assets for foreign NOLs becomes more likely than not, recognition of these acquired tax benefits would reduce income tax expense. As of December 31, 2017, the Company had a foreign NOL carryforward of approximately $0.7 million, which may be used to offset future taxable income in foreign jurisdictions until they expire at various dates through 2022. The Company considers the excess of its financial reporting over its tax basis in its investment in foreign subsidiaries essentially permanent in duration and as such has not recognized a deferred tax liability related to this difference. The Company had no unrecognized tax benefits at December 31, 2017. It is not expected that the amount of unrecognized tax benefits will change significantly within the next twelve months. A reconciliation of the beginning and ending amounts of unrecognized tax benefits for the years ended December 31, 2017, 2016, and 2015 is as follows: 2017 2016 2015 Balance at beginning of year $ — $ 184 $ 672 Reductions due to amnesty and settlement — (188 ) (160 ) Payments — — (336 ) Gross increases related to positions taken in prior periods — 4 8 Balance at end of year $ — $ — $ 184 The Company files income tax returns in the U.S. and in foreign jurisdictions. Generally, the Company is no longer subject to U.S., state, local and foreign income tax examinations by tax authorities in its major jurisdictions for years before 2014, except to the extent of NOL and tax credit carryforwards from those years. Major taxing jurisdictions include the U.S., both federal and state. As of December 31, 2017, the Company also had foreign NOL carryforwards of $0.7 million, which may be used to offset future taxable income in foreign jurisdictions until they expire at various dates through 2022. The deferred tax assets related to the foreign NOL carryforwards have been fully offset by a valuation allowance. Undistributed earnings of the Company’s foreign subsidiaries amounted to approximately $5.7 million as of December 31, 2017. The Company has not provided any additional federal or state income taxes or foreign withholding taxes on the undistributed earnings as such earnings have been indefinitely reinvested in the business. Due to the various methods by which such earnings could be repatriated in the future, the amount of taxes attributable to the undistributed earnings is not practicably determinable.

Segment Information

Segment Information	12 Months Ended
	Dec. 31, 2017
Segment Reporting [Abstract]
Segment Information	13. Segment Information The Company views its operations and manages its business as one operating segment based on factors such as how the Company manages its operations and how its executive management team reviews results and makes decisions on how to allocate resources and assess performance. Geographic Data Net sales to unaffiliated customers by geographic area were as follows: Years Ended December 31, 2017 2016 2015 United States $ 77,982 $ 79,535 $ 85,284 United Kingdom $ 12,544 $ 9,944 $ 10,999 Other International 18,030 17,146 15,543 Total $ 108,556 $ 106,625 $ 111,826 Long-lived assets by geographic area were as follows: Years Ended December 31, 2017 2016 U.S. $ 98,683 $ 98,330 International 5,402 4,972 Total $ 104,085 $ 103,302 Net sales to unaffiliated customers by geographic area are based on the customers’ current billing addresses, and does not consider the geo-targeted (target audience) location of the campaign. Long-lived assets are comprised of property and equipment, net; goodwill; and intangible assets, net. No single country outside of the U.S. accounted for 10% or more of the Company’s long-lived assets during either of these periods.

401(k) Plan

401(k) Plan	12 Months Ended
	Dec. 31, 2017
Postemployment Benefits [Abstract]
401(k) Plan	14. 401(k) Plan The Company maintains a 401(k) retirement savings plan (the “Plan”) whereby employees may elect to defer a portion of their salary and contribute the deferred portion to the Plan. The Company contributes an amount equal to 50% of the employee’s contribution to the Plan, up to an annual limit of $2 thousand. The Company contributed $0.9 million to the Plan for each of the years ended December 31, 2017, 2016, and 2015. Employee contributions and the Company’s matching contributions are invested in one or more collective investment funds at the participant’s direction. The Company’s matching contributions vest 25% annually and are 100% vested after four consecutive years of service.

Quarterly Financial Data (unaud

Quarterly Financial Data (unaudited)	12 Months Ended
	Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract]
Quarterly Financial Data (unaudited)	15. Quarterly Financial Data (unaudited) For the Three Months Ended 2017 2016 Mar. 31 Jun. 30 Sep. 30 Dec. 31 Mar. 31 Jun. 30 Sep. 30 Dec. 31 Total revenues $ 23,577 $ 26,664 $ 28,012 $ 30,303 $ 25,031 $ 29,174 $ 25,750 $ 26,670 Total cost of revenues 6,936 7,085 6,951 7,364 7,193 7,604 7,612 7,808 Total gross profit 16,641 19,579 21,061 22,939 17,838 21,570 18,138 18,862 Total operating expenses 16,823 17,094 18,174 17,719 17,600 17,266 17,589 17,162 Operating income (182 ) 2,485 2,887 5,220 238 4,304 549 1,700 Net income (loss) $ (29 ) $ 1,361 $ 2,074 $ 3,397 $ (48 ) $ 2,399 $ (22 ) $ 90 Net income (loss) per common share: Basic $ (0.00 ) $ 0.05 $ 0.08 $ 0.12 $ (0.00 ) $ 0.08 $ (0.00 ) $ 0.00 Diluted $ (0.00 ) $ 0.05 $ 0.07 $ 0.12 $ (0.00 ) $ 0.07 $ (0.00 ) $ 0.00

Summary of Significant Accoun24

Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2017
Accounting Policies [Abstract]
Principles of Consolidation	Principles of Consolidation The accompanying Consolidated Financial Statements include the accounts of the Company and its wholly-owned subsidiaries, TechTarget Securities Corporation (“TSC”), TechTarget Limited, TechTarget (HK) Limited (“TTGT HK”), TechTarget (Beijing) Information Technology Consulting Co. Ltd. (“TTGT Consulting”), TechTarget (Australia) Pty Ltd., TechTarget (Singapore) Pte Ltd., E-Magine Médias SAS (“LeMagIT”) and TechTarget Germany GmbH. TSC is a Massachusetts corporation. TechTarget Limited is a subsidiary doing business principally in the United Kingdom. TTGT HK is a subsidiary incorporated in Hong Kong in order to facilitate the Company’s activities in the Asia-Pacific region. Additionally, through its wholly-owned subsidiaries, TTGT HK and TTGT Consulting, the Company effectively controls a variable interest entity (“VIE”), Keji Wangtuo Information Technology Co., Ltd., (“KWIT”), which was incorporated under the laws of the People’s Republic of China (“PRC”). In 2018, TechTarget began modifying its PRC operations and consolidating its activities with other TechTarget locations. TechTarget (Australia) Pty Ltd. and TechTarget (Singapore) Pte Ltd. are the entities through which the Company does business in Australia and Singapore, respectively; LeMagIT and TechTarget Germany GmbH, both wholly-owned subsidiaries of TechTarget Limited, are entities through which the Company does business in France and Germany, respectively. PRC laws and regulations prohibit or restrict foreign ownership of Internet-related services and advertising businesses. To comply with these foreign ownership restrictions, the Company operates its websites and provides online advertising services in the PRC through KWIT. The Company entered into certain exclusive agreements with KWIT and its shareholders through TTGT HK, which obligated TTGT HK to absorb all of the risk of loss from KWIT’s activities and entitled TTGT HK to receive all of its residual returns. In addition, the Company entered into certain agreements with the authorized parties through TTGT HK, including Management and Consulting Services, Voting Proxy, Equity Pledge and Option Agreements. TTGT HK assigned all of its rights and obligations to the newly formed wholly foreign-owned enterprise (“WFOE”), TTGT Consulting. TTGT Consulting is established and existing under the laws of the PRC, and is wholly owned by TTGT HK. Based on these contractual arrangements, the Company consolidates the financial results of KWIT as required by Accounting Standards Codification (“ASC”) subtopic 810-10, Consolidation: Overall
Reclassifications	Reclassifications The adoption of a recent accounting pronouncement, described in more detail in the Accounting Guidance Adopted in 2017 section below, resulted in the Company recording deferred tax assets of approximately $0.2 million with an offsetting entry to retained earnings, as well as a reclassification between Operating Activities and Financing Activities in the Consolidated Statements of Cash Flows of $0.2 million and $3.2 million for the years ended December 31, 2016 and 2015, respectively. There was no effect on the Consolidated Statements of Income and Comprehensive Income. There were no reclassifications out of accumulated other comprehensive income in the years ended December 31, 2017, 2016, or 2015.
Use of Estimates	Use of Estimates The preparation of consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosures of contingent assets and liabilities at the date of the consolidated financial statements and the reported amounts of revenues and expenses during the reporting period. On an ongoing basis, the Company evaluates its estimates, including those related to revenues, long-lived assets, goodwill, the allowance for doubtful accounts, stock-based compensation, earnouts, self-insurance accruals and income taxes. Estimates of the carrying value of certain assets and liabilities are based on historical experience and on various other assumptions that the Company believes to be reasonable. Actual results could differ from those estimates.
Revenue Recognition	Revenue Recognition The Company generates substantially all of its revenues from the sale of targeted marketing and advertising campaigns, which are delivered via its network of websites, data analytics solutions, and, historically, events. In all cases, revenue is recognized only when the price is fixed or determinable, persuasive evidence of an arrangement exists, the service is performed and collectability of the resulting receivable is reasonably assured. The majority of the Company’s online media sales involve multiple service and product offerings, which are described in more detail below. Because neither vendor-specific objective evidence of fair value nor third-party evidence of fair value exists for all elements in the Company’s bundled product offerings, the Company uses an estimated selling price which represents management's best estimate of the stand-alone selling price for each deliverable in an arrangement. The Company establishes best estimates considering multiple factors including, but not limited to, class of client, size of transaction, available media inventory, pricing strategies and market conditions. The Company believes the use of the best estimate of selling price allows revenue recognition in a manner consistent with the underlying economics of the transaction. The Company uses the relative selling price method to allocate consideration at the inception of the arrangement to each deliverable in a multiple element arrangement. The relative selling price method allocates any discount in the arrangement proportionately to each deliverable on the basis of the deliverable's best estimate of selling price. Revenue is then recognized as delivery occurs. The Company typically offers standard 30 day cancellation terms under its agreements. The Company evaluates all deliverables of an arrangement at inception and each time an item is delivered, to determine whether they represent separate units of accounting. Based on this evaluation, the arrangement consideration is measured and allocated to each of these elements. Additionally, the Company offers sales incentives to certain customers, primarily in the form of volume rebates, which are classified as a reduction of revenues and are calculated based on the terms of the specific customer’s contract. The Company accrues for these sales incentives based on contractual terms and historical experience. Online Offerings IT Deal Alert™. This suite of products and services includes IT Deal Alert: Qualified Sales Opportunities™, which profiles specific in-progress purchase projects, IT Deal Alert: Priority Engine™, which is a subscription service powered by the Company’s Activity Intelligence™ platform that integrates into salesforce.com and delivers information to allow marketers and sales personnel to identify those accounts who are actively researching new technology purchases, IT Deal Alert: Deal Data™, which is a customized solution aimed at sales intelligence and data scientist functions that makes the Company’s Activity Intelligence data directly consumable by the customer’s internal applications, and IT Deal Alert: TechTarget Research™, which is a subscription product that sources proprietary information about purchase transactions from IT and business professionals who are making and have recently completed these purchases. Qualified Sales Opportunities revenue is recognized when the Qualified Sales Opportunity is delivered to the Company’s customer, Priority Engine revenue is recognized ratably over the duration of the service, Deal Data revenue is recognized upon delivery of the data to the Company’s customer, and Research revenue is recognized when the report is delivered. Core Online. The Company’s core online offerings enable its customers to reach and influence prospective buyers through content marketing programs designed to generate demand for their solutions, and through display advertising and other brand programs that influence consideration by prospective buyers. Demand Solutions. As part of its demand solutions campaign offerings, the Company may guarantee a minimum number of sales leads to be delivered over the course of the campaign. The Company determines the content necessary to achieve performance guarantees. Scheduled end dates of campaigns sometimes need to be extended, pursuant to the terms of the arrangement, to satisfy lead guarantees. The Company estimates a revenue reserve necessary to adjust revenue recognition for extended campaigns. These estimates are based on the Company’s experience in managing and fulfilling these offerings. The customer generally has cancellation privileges which normally require advance notice by the customer and require proportional payment by the customer for the portion of the campaign services provided by the Company. The Company recognizes revenue on duration-based campaigns ratably over the duration of the campaign, which is usually less than six months and recognizes revenue on contracts where pricing is based on cost per lead during the period in which leads are delivered to its customers. Brand Solutions. Brand solutions consist mostly of banner revenue, which is recognized in the period in which the banner impressions, engagements or clicks occur and microsite revenue, which is recognized over the period during which the microsites are live. Custom Content Creation. Custom content revenue is recognized when the creation is completed and delivered to the customer. Other. Includes list rental revenue, which is recognized in the period in which the Company delivers the customer’s content to a list of the Company’s registered members, and revenue from third-party revenue sharing arrangements, which is primarily recognized on a net basis in the period in which the services are performed . Events Revenue from vendor-sponsored events, whether sponsored exclusively by a single vendor or in a multi-vendor sponsored event, is recognized upon completion of the event in the period the event occurs. Historically, the majority of the Company’s events were free to qualified attendees and certain events were based on a paid attendee model, but the Company announced on February 14, 2017 that it would be phasing out its events product line. The Company recognizes revenue for paid attendee events upon completion of the event. Amounts collected or billed prior to satisfying the above revenue recognition criteria are recorded as deferred revenue. The Company excludes from its deferred revenue and accounts receivable balances amounts for which it has billed in advance prior to the start of a campaign or the delivery of services.
Fair Value of Financial Instruments	Fair Value of Financial Instruments Financial instruments consist of cash and cash equivalents, short-term and long-term investments, accounts receivable, accounts payable, long-term debt and contingent consideration. Due to their short-term nature and liquidity, the carrying value of these instruments, with the exception of contingent consideration and long-term debt, approximates their estimated fair values. See Note 3 for further information on the fair value of the Company’s investments. The Company classifies all of its short-term and long-term investments as available-for-sale. Amounts outstanding under the Company’s long-term debt are subject to variable rates of interest based on current market rates, and as such, the Company believes the carrying amount of these obligations approximates fair value. The fair value of contingent consideration was estimated using a discounted cash flow method described in Note 4.
Long-Lived Assets, Goodwill and Indefinite-lived Intangible Assets	Long-Lived Assets , Long-lived assets consist primarily of property and equipment, capitalized software, goodwill and other intangible assets. The Company reviews long-lived assets, including property and equipment and finite intangible assets, for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable. Conditions that would trigger an impairment assessment include, but are not limited to, a significant adverse change in legal factors or business climate that could affect the value of an asset or an adverse action or a significant decrease in the market price. A specifically identified intangible asset must be recorded as a separate asset from goodwill if either of the following two criteria is met: (1) the intangible asset acquired arises from contractual or other legal rights; or (2) the intangible asset is separable. Accordingly, intangible assets consist of specifically identified intangible assets. Goodwill is the excess of any purchase price over the estimated fair value of net tangible and intangible assets acquired. Goodwill and indefinite-lived intangible assets are not amortized but are reviewed annually for impairment or more frequently if impairment indicators arise. Separable intangible assets that are not deemed to have an indefinite life are amortized over their estimated useful lives, which range from five to ten years, using methods of amortization that are expected to reflect the estimated pattern of economic use, and are reviewed for impairment when events or changes in circumstances suggest that the assets may not be recoverable. Consistent with the Company’s determination that it has a single reporting segment, it has been determined that there is a single reporting unit and goodwill is therefore tested for impairment at the entity level. The Company performs its annual test of impairment of goodwill as of December 31st of each year and whenever events or changes in circumstances suggest that the carrying amount may not be recoverable using the two-step process required by ASC 350, Intangibles – Goodwill and Other Based on the aforementioned evaluation, the Company believes that, as of the balance sheet date presented, none of the Company’s goodwill or other long-lived assets was impaired. The Company did not have any intangible assets with indefinite lives as of December 31, 2017 or 2016.
Allowance for Doubtful Accounts	Allowance for Doubtful Accounts The Company reduces gross trade accounts receivable for an allowance for doubtful accounts. The allowance for doubtful accounts is the Company’s best estimate of the amount of probable credit losses in its existing accounts receivable. The allowance for doubtful accounts is reviewed on a regular basis, and all past due balances are reviewed individually for collectability. Account balances are charged against the allowance after all means of collection have been exhausted and the potential for recovery is considered remote. Provisions for doubtful accounts are recorded in general and administrative expense. Below is a summary of the changes in the Company’s allowance for doubtful accounts for the years ended December 31, 2017, 2016, and 2015. Balance at Beginning of Year Provision Acquired in Business Combinations Write-offs, Net of Recoveries Balance at End of Year Year ended December 31, 2015 $ 1,014 $ 805 — $ (104 ) $ 1,715 Year ended December 31, 2016 $ 1,715 $ 894 — $ (648 ) $ 1,961 Year ended December 31, 2017 $ 1,961 $ 806 — $ (984 ) $ 1,783
Property and Equipment and Other Capitalized Assets	Property and Equipment and Other Capitalized Assets Property and equipment and other capitalized assets are stated at cost. Property and equipment acquired through acquisitions of businesses are initially recorded at fair value. Depreciation is calculated on the straight-line method based on the month the asset is placed in service over the following estimated useful lives: Estimated Useful Life Furniture and fixtures 5 - 10 years Computer equipment and software 3 years Internal-use software and website development costs 3 - 5 years Leasehold improvements Shorter of useful life or remaining duration of lease Property and equipment and other capitalized assets consist of the following: As of December 31, 2017 2016 Furniture and fixtures $ 1,554 $ 988 Computer equipment and software 3,863 3,722 Leasehold improvements 2,887 2,050 Internal-use software and website development costs 26,702 23,782 35,006 30,542 Less: accumulated depreciation and amortization (25,220 ) (21,310 ) $ 9,786 $ 9,232 Depreciation expense was $4.5 million, $4.1 million, and $4.0 million for the years ended December 31, 2017, 2016, and 2015, respectively. Repairs and maintenance charges that do not increase the useful life of the assets are charged to operations as incurred. The Company wrote off approximately $0.6 million, $1.1 million, and $1.3 million of fully depreciated assets that were no longer in service during 2017, 2016, and 2015, respectively. Depreciation expense is classified as a component of operating expense in the Company’s results of operations.
Internal-Use Software and Website Development Costs	Internal-Use Software and Website Development Costs The Company capitalizes costs incurred during the development of its website applications and infrastructure as well as certain costs relating to internal-use software. The Company begins to capitalize costs to develop software and website applications when planning stage efforts are successfully completed, management has authorized and committed project funding, and it is probable that the project will be completed and the software will be used as intended. Judgment is required in determining the point at which various projects enter the state at which costs may be capitalized, in assessing the ongoing value of the capitalized costs and in determining the estimated useful lives over which the costs are amortized, which is generally four years. To the extent that the Company changes the manner in which it develops and tests new features and functionalities related to its websites, assesses the ongoing value of capitalized assets, or determines the estimated useful lives over which the costs are amortized, the amount of website development costs it capitalizes and amortizes in future periods would be impacted. The estimated useful life of costs capitalized is evaluated for each specific project. Capitalized internal-use software and website development costs are reviewed for recoverability whenever events or changes in circumstances indicate that the carrying amount of the asset may not be recoverable. An impairment loss would be recognized only if the carrying amount of the asset is not recoverable and exceeds its fair value. The Company capitalized internal-use software and website development costs of $2.9 million, $2.8 million, and $2.9 million for the years ended December 31, 2017, 2016, and 2015, respectively.
Concentrations of Credit Risk and Off-Balance Sheet Risk	Concentrations of Credit Risk and Off-Balance Sheet Risk Financial instruments that potentially expose the Company to concentrations of credit risk consist mainly of cash and cash equivalents, investments and accounts receivable. The Company maintains its cash and cash equivalents and investments principally in accredited financial institutions of high credit standing. The Company routinely assesses the credit worthiness of its customers. The Company generally has not experienced any significant losses related to individual customers or groups of customers in any particular industry or area. The Company does not require collateral. Due to these factors, no additional credit risk beyond amounts provided for collection losses is believed by management to be probable in the Company’s accounts receivable. At December 31, 2017, one customer represented 10% of total accounts receivable. No single customer represented 10% or more of total accounts receivable at December 31, 2016. No single customer accounted for 10% or more of total revenues in the years ended December 31, 2017, 2016, or 2015.
Income Taxes	Income Taxes The Company’s deferred tax assets and liabilities are recognized based on temporary differences between the financial reporting and income tax bases of assets and liabilities using statutory rates. A valuation allowance is established against net deferred tax assets if, based upon the weight of available evidence, it is more likely than not that some or all of the deferred tax assets will not be realized. The Company records a liability for unrecognized tax benefits resulting from uncertain tax positions taken or expected to be taken in a tax return using a “more likely than not” threshold as required by the provisions of ASC 740-10, Accounting for Uncertainty in Income Taxes The Company recognizes interest and penalties related to unrecognized tax benefits, if any, in income tax expense.
Stock-Based Compensation	Stock-Based Compensation The Company has stock-based employee compensation plans which are more fully described in Note 10. Stock-based compensation cost is measured at the grant date based on the fair value of the award and is recognized in the Consolidated Statement of Income and Comprehensive Income using the straight-line method over the vesting period of the award. The Company uses the Black-Scholes option-pricing model to determine the fair value of stock option awards.
Comprehensive Income	Comprehensive Income Comprehensive income includes all changes in equity during a period, except those resulting from investments by stockholders and distributions to stockholders. The Company's comprehensive income includes changes in the fair value of the Company’s unrealized gains on available for sale securities and foreign currency translation adjustments. There were no reclassifications out of accumulated other comprehensive income in the periods ended December 31, 2017, 2016, or 2015.
Foreign Currency	Foreign Currency The functional currency for each of the Company’s subsidiaries is the local currency of the country in which it is incorporated. All assets and liabilities are translated into U.S. dollar equivalents at the exchange rate in effect on the balance sheet date or at a historical rate. Revenues and expenses are translated at average exchange rates. Translation gains or losses are recorded in stockholders’ equity as an element of accumulated other comprehensive loss.
Net Income Per Share	Net Income Per Share Basic earnings per share is computed based on the weighted average number of common shares and vested restricted stock units outstanding during the period. Because the holders of unvested restricted stock units do not have nonforfeitable rights to dividends or dividend equivalents, the Company does not consider these restricted stock units to be participating securities that should be included in its computation of earnings per share under the two-class method. Diluted earnings per share is computed using the weighted average number of common shares and vested, undelivered restricted stock units outstanding during the period, plus the dilutive effect of potential future issuances of common stock relating to stock option and restricted stock unit programs using the treasury stock method. In calculating diluted earnings per share, the dilutive effect of stock options and restricted stock units is computed using the average market price for the respective period. In addition, the assumed proceeds under the treasury stock method include the average unrecognized compensation expense of stock options and restricted stock units that are in-the-money. This results in the “assumed” buyback of additional shares, thereby reducing the dilutive impact of stock options and restricted stock units. A reconciliation of the numerator and denominator used in the calculation of basic and diluted net income per share is as follows: For the Years Ended December 31, 2017 2016 2015 Numerator: Net income $ 6,803 $ 2,419 $ 7,186 Denominator: Basic: Weighted average shares of common stock and vested, undelivered restricted stock units outstanding 27,550,044 29,953,798 32,963,185 Diluted: Weighted average shares of common stock and vested, undelivered restricted stock units outstanding 27,550,044 29,953,798 32,963,185 Effect of potentially dilutive shares 721,340 819,734 1,512,620 Total weighted average shares of common stock and vested, undelivered restricted stock units outstanding and potentially dilutive shares 28,271,384 30,773,532 34,475,805 Calculation of Net Income Per Common Share: Basic: Net income applicable to common stockholders $ 6,803 $ 2,419 $ 7,186 Weighted average shares of stock outstanding 27,550,044 29,953,798 32,963,185 Net income per common share $ 0.25 $ 0.08 $ 0.22 Diluted: Net income applicable to common stockholders $ 6,803 $ 2,419 $ 7,186 Weighted average shares of stock outstanding 28,271,384 30,773,532 34,475,805 Net income per common share(1) $ 0.24 $ 0.08 $ 0.21 (1) In calculating diluted earnings per share, 0.7 million, 1.3 million, and 1.1 million shares related to outstanding stock options and unvested, undelivered restricted stock units were excluded for the years ended December 31, 2017, 2016, and 2015, respectively, because they were anti-dilutive.
Recent Accounting Pronouncements	Recent Accounting Pronouncements Accounting Guidance Adopted in 2017 In March 2016, the Financial Accounting Standards Board (“FASB”) issued ASU No. 2016-09, Compensation-Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting (“ASU 2016-09”). The updated guidance changes how companies account for certain aspects of share-based payment awards to employees, including the accounting for income taxes, forfeitures, and statutory tax withholding requirements, as well as classification in the Consolidated Statements of Cash Flows. ASU 2016-09 is effective for fiscal years beginning after December 15, 2016, including interim periods within those fiscal years. The Company adopted the provisions of the new standard on January 1, 2017. Implementing the new pronouncement resulted in the Company recognizing tax benefits and tax deficiencies related to stock compensation deductions as a component of the provision for income tax expense in the reporting period in which they occur. Additionally, the company has applied the modified retrospective adoption approach, which resulted in the Company recording deferred tax assets of approximately $0.2 million with an offsetting entry to retained earnings. ASU 2016-09 also requires the presentation of excess tax benefit from stock options as an operating activity on the Consolidated Statements of Cash Flows instead of as a financing activity, which resulted in a reclassification of $0.2 million and $3.2 million in the Consolidated Statement of Cash Flows for the years ended December 31, 2016 and 2015, respectively. Accounting Guidance Not Yet Adopted as of December 31, 2017 In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers (Topic 606) (“ASU 2014-09”), which supersedes the revenue recognition requirements in ASC 605, Revenue Recognition. ASU 2014-09 is based on the principle that revenue is recognized to depict the transfer of 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. ASU 2014-09 also requires additional disclosure about the nature, amount, timing and uncertainty of revenue and cash flows arising from customer contracts, including significant judgments and changes in judgments and assets recognized from costs incurred to obtain or fulfill a contract. The standard may be applied retrospectively to each prior period presented, or using the modified retrospective approach, with the cumulative effect recognized as of the date of initial application. The Company will adopt the standard effective January 1, 2018, using the modified retrospective approach. The Company does not anticipate any material changes as a result of adopting the standard. The Company will complete the remainder of its evaluation during the first quarter of fiscal 2018. The Company is also evaluating the impact the standard will have on its disclosures, which will be much more extensive under the new standard, and is implementing changes to its current policies, practices, and internal controls over financial reporting to address the requirements of the standard. In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842) (“ASU 2016-02”). ASU 2016-02 establishes a right-of-use (“ROU”) model that requires a lessee to record a ROU asset and a lease liability on the balance sheet for all leases with terms longer than 12 months. Leases will be classified as either finance or operating, with classification affecting the pattern of expense recognition in the income statement. ASU 2016-02 is effective for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. A modified retrospective transition approach is required for lessees for capital and operating leases existing at, or entered into after, the beginning of the earliest comparative period presented in the financial statements, with certain practical expedients available. The Company is currently evaluating the impact that this guidance will have on its consolidated financial statements and disclosure. In January 2017, the FASB issued ASU No. 2017-04, Intangibles-Goodwill and Other (Topic 350), Simplifying the Test for Goodwill Impairment ("ASU 2017-04"). ASU 2017-04 eliminates the requirement to calculate the implied fair value of goodwill to measure a goodwill impairment charge (step 2 of the goodwill impairment test) and instead requires only a one-step quantitative impairment test, performed by comparing the fair value of goodwill with its carrying amount. ASU 2017-04 is effective on a prospective basis effective for goodwill impairment tests in fiscal years beginning after December 15, 2019. Early adoption is permitted for goodwill impairment tests performed on testing dates after January 1, 2017. The Company is currently evaluating the impact that this guidance will have on its consolidated financial statements and disclosures.

Summary of Significant Accoun25

Summary of Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2017
Accounting Policies [Abstract]
Summary of Changes in Company's Allowance for Doubtful Accounts	Below is a summary of the changes in the Company’s allowance for doubtful accounts for the years ended December 31, 2017, 2016, and 2015. Balance at Beginning of Year Provision Acquired in Business Combinations Write-offs, Net of Recoveries Balance at End of Year Year ended December 31, 2015 $ 1,014 $ 805 — $ (104 ) $ 1,715 Year ended December 31, 2016 $ 1,715 $ 894 — $ (648 ) $ 1,961 Year ended December 31, 2017 $ 1,961 $ 806 — $ (984 ) $ 1,783
Estimated Useful Lives of Property and Equipment and Other Capitalized Assets	Depreciation is calculated on the straight-line method based on the month the asset is placed in service over the following estimated useful lives: Estimated Useful Life Furniture and fixtures 5 - 10 years Computer equipment and software 3 years Internal-use software and website development costs 3 - 5 years Leasehold improvements Shorter of useful life or remaining duration of lease
Property and Equipment and Other Capitalized Assets	Property and equipment and other capitalized assets consist of the following: As of December 31, 2017 2016 Furniture and fixtures $ 1,554 $ 988 Computer equipment and software 3,863 3,722 Leasehold improvements 2,887 2,050 Internal-use software and website development costs 26,702 23,782 35,006 30,542 Less: accumulated depreciation and amortization (25,220 ) (21,310 ) $ 9,786 $ 9,232
Reconciliation of Numerator and Denominator Used in Calculation of Basic and Diluted Net Income Per Share	A reconciliation of the numerator and denominator used in the calculation of basic and diluted net income per share is as follows: For the Years Ended December 31, 2017 2016 2015 Numerator: Net income $ 6,803 $ 2,419 $ 7,186 Denominator: Basic: Weighted average shares of common stock and vested, undelivered restricted stock units outstanding 27,550,044 29,953,798 32,963,185 Diluted: Weighted average shares of common stock and vested, undelivered restricted stock units outstanding 27,550,044 29,953,798 32,963,185 Effect of potentially dilutive shares 721,340 819,734 1,512,620 Total weighted average shares of common stock and vested, undelivered restricted stock units outstanding and potentially dilutive shares 28,271,384 30,773,532 34,475,805 Calculation of Net Income Per Common Share: Basic: Net income applicable to common stockholders $ 6,803 $ 2,419 $ 7,186 Weighted average shares of stock outstanding 27,550,044 29,953,798 32,963,185 Net income per common share $ 0.25 $ 0.08 $ 0.22 Diluted: Net income applicable to common stockholders $ 6,803 $ 2,419 $ 7,186 Weighted average shares of stock outstanding 28,271,384 30,773,532 34,475,805 Net income per common share(1) $ 0.24 $ 0.08 $ 0.21 (1) In calculating diluted earnings per share, 0.7 million, 1.3 million, and 1.1 million shares related to outstanding stock options and unvested, undelivered restricted stock units were excluded for the years ended December 31, 2017, 2016, and 2015, respectively, because they were anti-dilutive.

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	12 Months Ended
	Dec. 31, 2017
Fair Value Disclosures [Abstract]
Assets and Liabilities Carried at Fair Value and Measured on Recurring Basis	The fair value hierarchy of the Company’s financial assets and liabilities carried at fair value and measured on a recurring basis is as follows: Fair Value Measurements at Reporting Date Using December 31, 2017 Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Assets: Money market funds(1) $ 7,155 $ 7,155 $ — $ — Short-term investments(2) 7,650 — 7,650 — Long-term investments(2) 496 — 496 — Total assets $ 15,301 $ 7,155 $ 8,146 $ — Fair Value Measurements at Reporting Date Using December 31, 2016 Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Assets: Money market funds(1) $ 4,301 $ 4,301 $ — $ — Short-term investments(2) 10,988 — 10,988 — Long-term investments(2) 7,801 — 7,801 — Total assets $ 23,090 $ 4,301 $ 18,789 $ — (1) Included in cash and cash equivalents on the accompanying consolidated balance sheets; valued at quoted market prices in active markets. (2) Short-term and long-term investments consist of municipal bonds, corporate bonds, U.S. Treasury securities, and government agency bonds; their fair value is calculated using an interest rate yield curve for similar instruments.

Cash, Cash Equivalents and In27

Cash, Cash Equivalents and Investments (Tables)	12 Months Ended
	Dec. 31, 2017
Cash And Cash Equivalents [Abstract]
Cash and Cash Equivalents	Cash and cash equivalents consisted of the following: As of December 31, 2017 2016 Cash $ 18,811 $ 14,184 Money market funds 7,155 4,301 Total cash and cash equivalents $ 25,966 $ 18,485
Short-term and Long-term Investments	Short-term and long-term investments consisted of the following: December 31, 2017 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Estimated Fair Value Short-term and long-term investments: U.S. Treasury securities $ 1,499 $ — $ (6 ) $ 1,493 Government agency bonds 1,003 — (4 ) $ 999 Municipal bonds 4,169 — (14 ) $ 4,155 Corporate bonds 1,502 — (3 ) $ 1,499 Total short-term and long-term investments $ 8,173 $ — $ (27 ) $ 8,146 December 31, 2016 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Estimated Fair Value Short-term and long-term investments: U.S. Treasury securities $ 1,998 $ — $ (1 ) $ 1,997 Government agency bonds 5,012 1 (2 ) 5,011 Municipal bonds 9,817 — (42 ) 9,775 Corporate bonds 2,009 — (3 ) 2,006 Total short-term and long-term investments $ 18,836 $ 1 $ (48 ) $ 18,789

Goodwill (Tables)

Goodwill (Tables)	12 Months Ended
	Dec. 31, 2017
Goodwill And Intangible Assets Disclosure [Abstract]
Changes in Carrying Amount of Goodwill	The changes in the carrying amount of goodwill for the years ended December 31, 2017 and 2016 are as follows: As of December 31, 2017 2016 Balance as of beginning of year $ 93,469 $ 93,701 Effect of exchange rate changes 324 (232 ) Balance as of end of year $ 93,793 $ 93,469

Intangible Assets (Tables)

Intangible Assets (Tables)	12 Months Ended
	Dec. 31, 2017
Goodwill And Intangible Assets Disclosure [Abstract]
Summary of Intangible Assets	The following table summarizes the Company’s intangible assets, net: As of December 31, 2017 Estimated Useful Lives (Years) Gross Carrying Amount Accumulated Amortization Net Customer, affiliate and advertiser relationships 5 $ 6,938 $ (6,938 ) $ — Developed websites, technology and patents 10 1,342 (907 ) 435 Trademark, trade name and domain name 8 1,802 (1,731 ) 71 Proprietary user information database and internet traffic 5 1,202 (1,202 ) — Total intangible assets $ 11,284 $ (10,778 ) $ 506 As of December 31, 2016 Estimated Useful Lives (Years) Gross Carrying Amount Accumulated Amortization Net Customer, affiliate and advertiser relationships 5-9 $ 6,826 $ (6,807 ) $ 19 Developed websites, technology and patents 10 1,178 (705 ) 473 Trademark, trade name and domain name 5-8 1,749 (1,664 ) 85 Proprietary user information database and internet traffic 5 1,146 (1,122 ) 24 Total intangible assets $ 10,899 $ (10,298 ) $ 601
Schedule of Amortization Expense of Intangible Assets	The Company expects amortization expense of intangible assets to be as follows: Years Ending December 31: Amortization Expense 2018 111 2019 93 2020 79 2021 96 2022 127 $ 506

Term Loan Agreement and Prior30

Term Loan Agreement and Prior Credit Agreement (Tables)	12 Months Ended
	Dec. 31, 2017
Debt Disclosure [Abstract]
Summary of Term Loan Agreement	Expected future installment payments on the principal by year and amounts included in the Company’s Consolidated Balance Sheet as of December 31, 2017 related to the Term Loan Agreement are as follows: Years Ending December 31: 2018 10,000 2019 10,000 2020 10,000 2021 2,500 2022 — Total principal on term loan 32,500 Unamortized debt issuance costs (273 ) Carrying amount of term loan 32,227 Less: current portion of term loan, net of $112 in unamortized debt issuance costs (9,888 ) Long-term portion of term loan, net of $161 in unamortized debt issuance costs $ 22,339

Commitments and Contingencies (

Commitments and Contingencies (Tables)	12 Months Ended
	Dec. 31, 2017
Commitments And Contingencies Disclosure [Abstract]
Schedule of Future Minimum Lease Payments	Future minimum lease payments under the Company’s noncancelable operating leases at December 31, 2017 are as follows: Years Ending December 31: Minimum Lease Payments 2018 4,230 2019 4,118 2020 3,640 2021 3,745 2022 3,397 Thereafter 24,664 $ 43,794

Stock-Based Compensation (Table

Stock-Based Compensation (Tables)	12 Months Ended
	Dec. 31, 2017
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Fair Values of Options Granted Estimated Using Weighted-Average Assumptions	The Company uses the Black-Scholes option pricing model to calculate the grant-date fair value of an award. The Company calculated the fair values of the options granted using the following estimated weighted-average assumptions: Years Ended December 31, 2017 2016 2015 Expected volatility 43 % 46 % 47 % Expected term 6 years 6 years 6 years Risk-free interest rate 1.87 % 1.90 % 1.67 % Expected dividend yield — % — % — % Weighted-average grant date fair value per share $ 4.61 $ 3.91 $ 3.72
Summary of Stock Option Activity Under Company's Stock Option Plans	A summary of the stock option activity under the Company’s stock option plans for the year ended December 31, 2017 is presented below: Options Outstanding Weighted-Average Exercise Price Per Share Weighted-Average Remaining Contractual Term in Years Aggregate Intrinsic Value Options outstanding at December 31, 2016 861,380 $ 9.42 Granted 20,000 10.33 Exercised (169,276 ) 5.56 Forfeited — — Canceled (368,014 ) 14.06 Options outstanding at December 31, 2017 344,090 $ 6.41 3.09 $ 2,585 Options exercisable at December 31, 2017 324,090 $ 6.16 2.69 $ 2,514 Options vested or expected to vest at December 31, 2017 342,130 $ 6.39 3.05 $ 2,578
Summary of Restricted Stock Unit Award Activity Under Company's Plans	Restricted stock unit awards are valued at the market price of a share of the Company’s common stock on the date of the grant. A summary of the restricted stock unit award activity under the Company’s plans for the year ended December 31, 2017 is presented below: Shares Weighted-Average Grant Date Fair Value Per Share Aggregate Intrinsic Value Nonvested outstanding at December 31, 2016 1,640,790 $ 8.54 Granted 676,217 9.93 Vested (866,007 ) 8.20 Forfeited (37,000 ) 9.88 Nonvested outstanding at December 31, 2017 1,414,000 $ 9.37 $ 19,683

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Schedule of Income Before Provision for Income Taxes	Income before provision for income taxes was as follows: Years Ended December 31, 2017 2016 2015 U.S. $ 9,435 $ 3,351 $ 11,040 Foreign 282 1,666 881 Income before income taxes $ 9,717 $ 5,017 11,921
Income Tax Provision	The income tax provision for the years ended December 31, 2017, 2016, and 2015 consisted of the following: Years Ended December 31, 2017 2016 2015 Current: Federal $ 1,543 $ 1,627 $ 2,500 State 419 (569 ) 167 Foreign 57 415 320 Total current 2,019 1,473 2,987 Deferred: Federal 598 1,592 796 State 382 (21 ) 796 Foreign (85 ) (446 ) 156 Total deferred 895 1,125 1,748 $ 2,914 $ 2,598 $ 4,735
Difference by Applying the Statutory Federal Income Tax Rate	The income tax provision for the years ended December 31, 2017, 2016, and 2015 differs from the amounts computed by applying the statutory federal income tax rate to the consolidated income before provision for income taxes as follows: Years Ended December 31, 2017 2016 2015 Provision computed at statutory rate $ 3,401 $ 1,757 $ 4,172 Increase resulting from: Difference in rates for foreign jurisdictions 37 (146 ) (181 ) Tax exempt interest income (12 ) (21 ) (6 ) Stock-based compensation (304 ) 315 (430 ) Other non-deductible expenses (101 ) 67 14 Non-deductible officers compensation 447 738 408 State income tax provision 653 (380 ) 573 Losses not benefitted 4 1 9 Subsidiary earnings taxed in the US 127 253 — True-up of prior year returns (161 ) 11 197 Research and development credit (801 ) — — Tax Cuts and Jobs Act of 2017 (376 ) — — Other — 3 (21 ) Provision for income taxes $ 2,914 $ 2,598 $ 4,735
Significant Components of the Company's Net Deferred Tax Assets and Liabilities	Significant components of the Company’s net deferred tax assets and liabilities are as follows: As of December 31, 2017 2016 Deferred tax assets: Net operating loss carryforwards $ 166 $ 308 Deferred revenue 187 187 Accruals and allowances 972 1,721 Stock-based compensation 815 1,656 Deferred rent expense 1,327 809 Other 4 — Gross deferred tax assets 3,471 4,681 Less valuation allowance (352 ) (443 ) Total deferred tax assets 3,119 4,238 Deferred tax liabilities: Intangible asset amortization (2,036 ) (1,865 ) Depreciation (1,823 ) (2,434 ) Total deferred tax liabilities (3,859 ) (4,299 ) Net deferred tax liabilities $ (740 ) $ (61 ) As reported: Non-current deferred tax assets $ 98 $ 139 Non-current deferred tax liabilities $ (838 ) $ 200
Reconciliation of the Beginning and Ending Amounts of Unrecognized Tax Benefits	A reconciliation of the beginning and ending amounts of unrecognized tax benefits for the years ended December 31, 2017, 2016, and 2015 is as follows: 2017 2016 2015 Balance at beginning of year $ — $ 184 $ 672 Reductions due to amnesty and settlement — (188 ) (160 ) Payments — — (336 ) Gross increases related to positions taken in prior periods — 4 8 Balance at end of year $ — $ — $ 184

Segment Information (Tables)

Segment Information (Tables)	12 Months Ended
	Dec. 31, 2017
Segment Reporting [Abstract]
Net Sales to Unaffiliated Customers by Geographic Area	Net sales to unaffiliated customers by geographic area were as follows: Years Ended December 31, 2017 2016 2015 United States $ 77,982 $ 79,535 $ 85,284 United Kingdom $ 12,544 $ 9,944 $ 10,999 Other International 18,030 17,146 15,543 Total $ 108,556 $ 106,625 $ 111,826
Long-Lived Assets by Geographic Area	Long-lived assets by geographic area were as follows: Years Ended December 31, 2017 2016 U.S. $ 98,683 $ 98,330 International 5,402 4,972 Total $ 104,085 $ 103,302

Quarterly Financial Data (una35

Quarterly Financial Data (unaudited) (Tables)	12 Months Ended
	Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract]
Quarterly Financial Data (unaudited)	For the Three Months Ended 2017 2016 Mar. 31 Jun. 30 Sep. 30 Dec. 31 Mar. 31 Jun. 30 Sep. 30 Dec. 31 Total revenues $ 23,577 $ 26,664 $ 28,012 $ 30,303 $ 25,031 $ 29,174 $ 25,750 $ 26,670 Total cost of revenues 6,936 7,085 6,951 7,364 7,193 7,604 7,612 7,808 Total gross profit 16,641 19,579 21,061 22,939 17,838 21,570 18,138 18,862 Total operating expenses 16,823 17,094 18,174 17,719 17,600 17,266 17,589 17,162 Operating income (182 ) 2,485 2,887 5,220 238 4,304 549 1,700 Net income (loss) $ (29 ) $ 1,361 $ 2,074 $ 3,397 $ (48 ) $ 2,399 $ (22 ) $ 90 Net income (loss) per common share: Basic $ (0.00 ) $ 0.05 $ 0.08 $ 0.12 $ (0.00 ) $ 0.08 $ (0.00 ) $ 0.00 Diluted $ (0.00 ) $ 0.05 $ 0.07 $ 0.12 $ (0.00 ) $ 0.07 $ (0.00 ) $ 0.00

Organization and Operations - A

Organization and Operations - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2017Website
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Number of websites	140

Summary of Significant Accoun37

Summary of Significant Accounting Policies - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2017USD ($)SegmentReporting_UnitCustomer	Dec. 31, 2016USD ($)Customer	Dec. 31, 2015USD ($)Customer
Significant Accounting Policies [Line Items]
Deferred tax assets	$ 3,471,000	$ 4,681,000
Reclassifications out of accumulated other comprehensive income	$ 0	0	$ 0
Number of reporting segment | Segment	1
Number of reporting unit | Reporting_Unit	1
Intangible assets with indefinite lives	$ 0	0
Depreciation	4,467,000	4,084,000	3,982,000
Write off of fully depreciated assets no longer in service	600,000	1,100,000	1,300,000
Capitalized internal-use software and website development costs	$ 2,900,000	$ 2,800,000	$ 2,900,000
Customer Concentration Risk [Member] | Accounts Receivable [Member]
Significant Accounting Policies [Line Items]
Number of customers represented 10% or more of total accounts receivable | Customer	1	0
Concentration risk, percentage	10.00%
Customer Concentration Risk [Member] | Sales Revenue, Net [Member]
Significant Accounting Policies [Line Items]
Number of customers accounted for Specific revenue | Customer	0	0	0
Minimum [Member]
Significant Accounting Policies [Line Items]
Estimated useful lives	5 years
Maximum [Member]
Significant Accounting Policies [Line Items]
Estimated useful lives	10 years
ASU No. 2016-09 [Member]
Significant Accounting Policies [Line Items]
Deferred tax assets	$ 200,000	$ 200,000	$ 200,000
Reclassification between operating activities and financing activities		$ 200,000	$ 3,200,000

Summary of Significant Accoun38

Summary of Significant Accounting Policies - Summary of Changes in Company's Allowance for Doubtful Accounts (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Regulatory Assets [Abstract]
Balance at Beginning of Year	$ 1,961	$ 1,715	$ 1,014
Provision	806	894	805
Acquired in Business Combinations	0	0	0
Write-offs, Net of Recoveries	(984)	(648)	(104)
Balance at End of Year	$ 1,783	$ 1,961	$ 1,715

Summary of Significant Accoun39

Summary of Significant Accounting Policies - Estimated Useful Lives of Property and Equipment and Other Capitalized Assets (Detail)	12 Months Ended
	Dec. 31, 2017
Computer Equipment and Software [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life	3 years
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Leasehold improvements	Shorter of useful life or remaining duration of lease
Minimum [Member] | Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life	5 years
Minimum [Member] | Internal-use software and website development costs
Property, Plant and Equipment [Line Items]
Estimated useful life	3 years
Maximum [Member] | Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life	10 years
Maximum [Member] | Internal-use software and website development costs
Property, Plant and Equipment [Line Items]
Estimated useful life	5 years

Summary of Significant Accoun40

Summary of Significant Accounting Policies - Property and Equipment and Other Capitalized Assets (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 35,006	$ 30,542
Less: accumulated depreciation and amortization	(25,220)	(21,310)
Property and equipment, net	9,786	9,232
Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	1,554	988
Computer Equipment and Software [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	3,863	3,722
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	2,887	2,050
Internal-use software and website development costs
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 26,702	$ 23,782

Summary of Significant Accoun41

Summary of Significant Accounting Policies - Reconciliation of Numerator and Denominator Used in Calculation of Basic and Diluted Net Income Per Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Numerator:
Net income	$ 3,397	$ 2,074	$ 1,361	$ (29)	$ 90	$ (22)	$ 2,399	$ (48)	$ 6,803	$ 2,419	$ 7,186
Basic:
Weighted average shares of common stock and vested, undelivered restricted stock units outstanding									27,550,044	29,953,798	32,963,185
Diluted:
Weighted average shares of common stock and vested, undelivered restricted stock units outstanding									27,550,044	29,953,798	32,963,185
Effect of potentially dilutive shares									721,340	819,734	1,512,620
Total weighted average shares of common stock and vested, undelivered restricted stock units outstanding and potentially dilutive shares									28,271,384	30,773,532	34,475,805
Basic:
Net income applicable to common stockholders	$ 3,397	$ 2,074	$ 1,361	$ (29)	$ 90	$ (22)	$ 2,399	$ (48)	$ 6,803	$ 2,419	$ 7,186
Weighted average shares of stock outstanding									27,550,044	29,953,798	32,963,185
Net income per common share	$ 0.12	$ 0.08	$ 0.05	$ 0	$ 0	$ 0	$ 0.08	$ 0	$ 0.25	$ 0.08	$ 0.22
Diluted:
Net income applicable to common stockholders	$ 3,397	$ 2,074	$ 1,361	$ (29)	$ 90	$ (22)	$ 2,399	$ (48)	$ 6,803	$ 2,419	$ 7,186
Weighted average shares of stock outstanding									28,271,384	30,773,532	34,475,805
Net income per common share	$ 0.12	$ 0.07	$ 0.05	$ 0	$ 0	$ 0	$ 0.07	$ 0	$ 0.24	$ 0.08	$ 0.21

Summary of Significant Accoun42

Summary of Significant Accounting Policies - Reconciliation of Numerator and Denominator Used in Calculation of Basic and Diluted Net Income Per Share (Parenthetical) (Detail) - shares shares in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Earnings Per Share [Abstract]
Outstanding stock options and unvested restricted stock units excluded from computation of diluted EPS	0.7	1.3	1.1

Fair Value Measurements - Asset

Fair Value Measurements - Assets and Liabilities Carried at Fair Value and Measured on Recurring Basis (Detail) - Fair Value, Measurements, Recurring [Member] - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Assets:
Total assets	$ 15,301	$ 23,090
Money Market Funds [Member]
Assets:
Total assets	7,155	4,301
Short-Term Investments [Member]
Assets:
Total assets	7,650	10,988
Long-term Investments [Member]
Assets:
Total assets	496	7,801
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Assets:
Total assets	7,155	4,301
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Money Market Funds [Member]
Assets:
Total assets	7,155	4,301
Significant Other Observable Inputs (Level 2) [Member]
Assets:
Total assets	8,146	18,789
Significant Other Observable Inputs (Level 2) [Member] | Short-Term Investments [Member]
Assets:
Total assets	7,650	10,988
Significant Other Observable Inputs (Level 2) [Member] | Long-term Investments [Member]
Assets:
Total assets	$ 496	$ 7,801

Acquisition - Additional Inform

Acquisition - Additional Information (Detail) $ in Thousands	Dec. 17, 2012USD ($)Installment	Dec. 31, 2016USD ($)	Dec. 31, 2014USD ($)	Dec. 31, 2013USD ($)	Dec. 31, 2017USD ($)
Business Acquisition [Line Items]
Cash paid for acquisition			$ 1,200	$ 1,200
Discount rate of projected net cash flows	10.00%
Payment of earnout liabilities		$ 459
Significant Unobservable Inputs (Level 3) [Member]
Business Acquisition [Line Items]
Discount rate of projected net cash flows	28.00%
LeMagIT [Member]
Business Acquisition [Line Items]
Cash paid for acquisition	$ 2,200
Potential future earn-out	$ 700
Number of installments for acquisition cost | Installment	2
Contingent consideration					$ 1,300
Contingent consideration, holdback amount					$ 400
Payment of earnout liabilities		$ 500

Cash, Cash Equivalents and In45

Cash, Cash Equivalents and Investments - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2017USD ($)Security	Dec. 31, 2016USD ($)Security	Dec. 31, 2015USD ($)
Cash And Cash Equivalents [Abstract]
Liquid investments with maturities	3 months
Cumulative unrealized loss, net of taxes	$ 17,000	$ 30,000	$ 19,000
Realized gains or losses	$ 0	$ 0	$ 0
Number of securities in unrealized loss position | Security	15	21
Unrealized loss available for sale securities, less than 17 months	$ 27,000	$ 48,000
Unrealized loss available for sale securities fair value, less than 17 months	$ 8,100,000	$ 13,800,000
Maximum duration of security	17 months
Municipal bonds maturity Start - date	Jan. 31, 2018
Municipal bonds maturity End - date	Jan. 31, 2019

Cash, Cash Equivalents and In46

Cash, Cash Equivalents and Investments - Cash and Cash Equivalents (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Cash And Cash Equivalents [Abstract]
Cash	$ 18,811	$ 14,184
Money market funds	7,155	4,301
Total cash and cash equivalents	$ 25,966	$ 18,485	$ 14,783	$ 19,275

Cash, Cash Equivalents and In47

Cash, Cash Equivalents and Investments - Short-term and Long-term Investments (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 8,173	$ 18,836
Gross Unrealized Gains		1
Gross Unrealized Losses	(27)	(48)
Estimated Fair Value	8,146	18,789
U.S. Treasury Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	1,499	1,998
Gross Unrealized Losses	(6)	(1)
Estimated Fair Value	1,493	1,997
US Government Agencies Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	1,003	5,012
Gross Unrealized Gains		1
Gross Unrealized Losses	(4)	(2)
Estimated Fair Value	999	5,011
Municipal Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	4,169	9,817
Gross Unrealized Losses	(14)	(42)
Estimated Fair Value	4,155	9,775
Corporate Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	1,502	2,009
Gross Unrealized Losses	(3)	(3)
Estimated Fair Value	$ 1,499	$ 2,006

Goodwill - Changes in Carrying

Goodwill - Changes in Carrying Amount of Goodwill (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Goodwill And Intangible Assets Disclosure [Abstract]
Balance as of beginning of year	$ 93,469	$ 93,701
Effect of exchange rate changes	324	(232)
Balance as of end of year	$ 93,793	$ 93,469

Intangible Assets - Summary of

Intangible Assets - Summary of Intangible Assets (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 11,284	$ 10,899
Accumulated Amortization	(10,778)	(10,298)
Total intangible assets	$ 506	601
Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated useful lives	5 years
Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated useful lives	10 years
Customer, Affiliate and Advertiser Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated useful lives	5 years
Gross Carrying Amount	$ 6,938	6,826
Accumulated Amortization	$ (6,938)	(6,807)
Total intangible assets		$ 19
Customer, Affiliate and Advertiser Relationships [Member] | Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated useful lives		5 years
Customer, Affiliate and Advertiser Relationships [Member] | Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated useful lives		9 years
Developed Websites, Technology and Patents [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated useful lives	10 years	10 years
Gross Carrying Amount	$ 1,342	$ 1,178
Accumulated Amortization	(907)	(705)
Total intangible assets	$ 435	473
Trademarks, Trade Name and Domain Name [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated useful lives	8 years
Gross Carrying Amount	$ 1,802	1,749
Accumulated Amortization	(1,731)	(1,664)
Total intangible assets	$ 71	$ 85
Trademarks, Trade Name and Domain Name [Member] | Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated useful lives		5 years
Trademarks, Trade Name and Domain Name [Member] | Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated useful lives		8 years
Proprietary User Information Database and Internet Traffic [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated useful lives	5 years	5 years
Gross Carrying Amount	$ 1,202	$ 1,146
Accumulated Amortization	$ (1,202)	(1,122)
Total intangible assets		$ 24

Intangible Assets - Additional

Intangible Assets - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items]
Remaining amortization period	3 years 25 days
Amortization of intangible assets	$ 169,000	$ 809,000	$ 1,382,000
Write off of intangible assets	$ 0	$ 100,000
Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated useful lives	5 years
Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated useful lives	10 years

Intangible Assets - Schedule of

Intangible Assets - Schedule of Amortization Expense of Intangible Assets (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Goodwill And Intangible Assets Disclosure [Abstract]
2,018	$ 111
2,019	93
2,020	79
2,021	96
2,022	127
Total intangible assets	$ 506	$ 601

Term Loan Agreement and Prior52

Term Loan Agreement and Prior Credit Agreement - Additional Information (Detail) $ in Thousands, shares in Millions	Jun. 22, 2017USD ($)	Jun. 08, 2016shares	May 09, 2016USD ($)	Dec. 31, 2017USD ($)	Dec. 31, 2016USD ($)	Jun. 21, 2017USD ($)
Line Of Credit Facility [Line Items]
Aggregate principal amount of term loan borrowed					$ 50,000
Amortization of deferred issuance costs				$ 109	60
Term loan principal payment				6,250	11,250
Total debt issuance costs paid				$ 50	367
Common stock repurchased, shares | shares		8
Tender offer commencement date				May 10, 2016
Term Loan Agreement [Member]
Line Of Credit Facility [Line Items]
Minimum liquidity requirement for capital stock repurchase	$ 15,000					$ 10,000
Term Loan Agreement [Member] | Quarter Ending March 31, 2018 [Member]
Line Of Credit Facility [Line Items]
Total consolidated leverage ratio, maximum	2.50
Term Loan Agreement [Member] | Quarters Ending On or After March 31, 2020 [Member]
Line Of Credit Facility [Line Items]
Total consolidated leverage ratio, maximum	1.50
Senior Secured Credit Facilities Credit Agreement [Member]
Line Of Credit Facility [Line Items]
Credit agreement bearing interest rate				Annual rate of 1.50%
Interest bearing rate			1.50%
Applicable interest rate on borrowings				4.11%
LIBOR margin				plus 2.50
Interest expense				$ 1,400	1,100
Amortization of deferred issuance costs				100	60
Term loan principal payment				6,300	11,300
Principal pre-payment in excess of contractual amounts due					$ 10,000
Total debt issuance costs paid				$ 400
Senior Secured Credit Facilities Credit Agreement [Member] | Federal Funds Effective Rate [Member]
Line Of Credit Facility [Line Items]
Applicable interest rate on borrowings			0.50%
Senior Secured Credit Facilities Credit Agreement [Member] | London Interbank Offered Rate (LIBOR) [Member]
Line Of Credit Facility [Line Items]
Debt instrument basis spread on variable rate			2.50%
Senior Secured Credit Facilities Credit Agreement [Member] | Term Loan Agreement [Member]
Line Of Credit Facility [Line Items]
Date the company entered into a Credit Agreement			May 9, 2016
Aggregate principal amount of term loan borrowed			$ 50,000
Debt instrument term loan			5 years
Debt instrument payment frequency				Quarterly
Senior Secured Credit Facilities Credit Agreement [Member] | Term Loan Agreement [Member] | Term Loan Agreement Year One [Member]
Line Of Credit Facility [Line Items]
Debt instrument interest rate				2.50%
Senior Secured Credit Facilities Credit Agreement [Member] | Term Loan Agreement [Member] | Term Loan Agreement After Year One [Member]
Line Of Credit Facility [Line Items]
Debt instrument interest rate				5.00%

Term Loan Agreement and Prior53

Term Loan Agreement and Prior Credit Agreement - Summary of Term Loan Agreement (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Less: current portion of term loan, net of $112 in unamortized debt issuance costs	$ (9,888)	$ (6,157)
Long-term portion of term loan, net of $161 in unamortized debt issuance costs	22,339	$ 32,286
Senior Secured Credit Facilities Credit Agreement [Member]
Debt Instrument [Line Items]
2,018	10,000
2,019	10,000
2,020	10,000
2,021	2,500
Total principal on term loan	32,500
Unamortized debt issuance costs	(273)
Carrying amount of term loan	32,227
Less: current portion of term loan, net of $112 in unamortized debt issuance costs	(9,888)
Long-term portion of term loan, net of $161 in unamortized debt issuance costs	$ 22,339

Term Loan Agreement and Prior54

Term Loan Agreement and Prior Credit Agreement - Summary of Term Loan Agreement (Parenthetical) (Detail) - Senior Secured Credit Facilities Credit Agreement [Member] $ in Thousands	Dec. 31, 2017USD ($)
Debt Instrument [Line Items]
Debt issuance costs, current, net	$ 112
Debt issuance costs, noncurrent, net	$ 161

Commitments and Contingencies -

Commitments and Contingencies - Additional Information (Detail)	Oct. 26, 2017USD ($)ft²	Dec. 31, 2017USD ($)	Dec. 31, 2016USD ($)	Dec. 31, 2015USD ($)
Commitments and Contingencies [Line Items]
Total rent expense under the Company's leases		$ 4,500,000	$ 4,400,000	$ 3,900,000
Charges, claims related to litigation		$ 0	$ 0
Third Amendment Newton Lease [Member]
Commitments and Contingencies [Line Items]
Lease extension date	Dec. 31, 2029
Operating lease term option to extend	5 years
One-time cash allowance	$ 3,300,000
Amendment effective date	Jan. 1, 2018
Base monthly rent	$ 300,000
Percentage increase in base rent	1.00%
Third Amendment Newton Lease [Member] | Maximum [Member]
Commitments and Contingencies [Line Items]
Lease agreement for office | ft²	110,000
Third Amendment Newton Lease [Member] | Minimum [Member]
Commitments and Contingencies [Line Items]
Lease agreement for office | ft²	74,000

Commitments and Contingencies56

Commitments and Contingencies - Schedule of Future Minimum Lease Payments (Detail) $ in Thousands	Dec. 31, 2017USD ($)
Commitments And Contingencies Disclosure [Abstract]
2,018	$ 4,230
2,019	4,118
2,020	3,640
2,021	3,745
2,022	3,397
Thereafter	24,664
Future minimum lease payments, Total	$ 43,794

Stock-Based Compensation - Addi

Stock-Based Compensation - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Jun. 16, 2017	Apr. 30, 2007
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Common stock outstanding under the plan	344,090	861,380
Expected dividend yield	0.00%	0.00%	0.00%
Intrinsic value of options exercised	$ 900	$ 1,900	$ 1,700
Cash received from exercise of options	942	4,192	2,802
Employee service share-based compensation, nonvested units, compensation cost not yet recognized	$ 11,100
Employee service share-based compensation, nonvested units, compensation cost not yet recognized, period for recognition	1 year 10 months 24 days
Restricted Stock Units [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Grant date fair value of restricted stock units vested	$ 7,100	$ 7,400	$ 7,200
Stock Option 2007 Plan [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Issuance of common stock incentives					2,911,667
Plan expiration period	2017-05
Additional share authorized	8,224,334
New awards granted	0
Common stock outstanding under the plan	1,171,840
Stock Option 2007 Plan [Member] | Restricted Stock Units [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of vested units that remain outstanding	93,750
Stock Option 2017 Plan [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Issuance of common stock incentives				3,000,000
Common stock outstanding under the plan	680,000
Plan effective date	Jun. 16, 2017
Minimum [Member] | Stock Option 1999 Plan [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Period of grants vested	4 years
Minimum [Member] | Stock Option 2007 Plan [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Period of grants vested	3 years
Minimum [Member] | Stock Option 2017 Plan [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Period of grants vested	3 years
Maximum [Member] | Stock Option 1999 Plan [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Period of grants expired	10 years
Maximum [Member] | Stock Option 2007 Plan [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Period of grants vested	4 years
Period of grants expired	10 years
Annual increase in reserved common stock	2.00%
Maximum [Member] | Stock Option 2017 Plan [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Period of grants expired	10 years

Stock-Based Compensation - Fair

Stock-Based Compensation - Fair Values of Options Granted Estimated Using Weighted-Average Assumptions (Detail) - $ / shares	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Expected volatility	43.00%	46.00%	47.00%
Expected term	6 years	6 years	6 years
Risk-free interest rate	1.87%	1.90%	1.67%
Expected dividend yield	0.00%	0.00%	0.00%
Weighted-average grant date fair value per share	$ 4.61	$ 3.91	$ 3.72

Stock-Based Compensation - Summ

Stock-Based Compensation - Summary of Stock Option Activity under Company's Stock Option Plans (Detail) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2017USD ($)$ / sharesshares
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Options outstanding, beginning balance | shares	861,380
Options Outstanding, Granted | shares	20,000
Options Outstanding, Exercised | shares	(169,276)
Options Outstanding, Canceled | shares	(368,014)
Options outstanding, ending balance | shares	344,090
Options Outstanding, Options exercisable | shares	324,090
Options Outstanding, Options vested or expected to vest | shares	342,130
Weighted-Average Exercise Price Per Share, Options outstanding, beginning balance | $ / shares	$ 9.42
Weighted-Average Exercise Price Per Share, Granted | $ / shares	10.33
Weighted-Average Exercise Price Per Share, Exercised | $ / shares	5.56
Weighted- Average Exercise Price Per Share, Canceled | $ / shares	14.06
Weighted- Average Exercise Price Per Share, Options outstanding, ending balance | $ / shares	6.41
Weighted- Average Exercise Price Per Share, Options exercisable | $ / shares	6.16
Weighted-Average Exercise Price Per Share, Options vested or expected to vest | $ / shares	$ 6.39
Weighted-Average Remaining Contractual Term in Years, Options outstanding	3 years 1 month 3 days
Weighted-Average Remaining Contractual Term in Years, Options exercisable	2 years 8 months 9 days
Weighted-Average Remaining Contractual Term in Years, Options vested or expected to vest	3 years 18 days
Aggregate Intrinsic Value, Options outstanding | $	$ 2,585
Aggregate Intrinsic Value, Options exercisable | $	2,514
Aggregate Intrinsic Value, Options vested or expected to vest | $	$ 2,578

Stock-Based Compensation - Su60

Stock-Based Compensation - Summary of Restricted Stock Unit Award Activity Under Company's Plans (Detail) - Restricted Stock [Member] - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares, Nonvested outstanding, beginning balance	1,640,790
Shares, Granted	676,217
Shares, Vested	(866,007)
Shares, Forfeited	(37,000)
Shares, Nonvested outstanding, ending balance	1,414,000
Weighted-Average Grant Date Fair Value Per Share, Nonvested outstanding, beginning balance	$ 9.37	$ 8.54
Weighted-Average Grant Date Fair Value Per Share, Granted	9.93
Weighted-Average Grant Date Fair Value Per Share, Vested	8.20
Weighted-Average Grant Date Fair Value Per Share, Forfeited	$ 9.88
Aggregate Intrinsic Value, Nonvested outstanding	$ 19,683

Stockholders' Equity - Addition

Stockholders' Equity - Additional Information (Detail) - USD ($)	Jun. 08, 2016	May 10, 2016	Feb. 29, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Jun. 30, 2016	May 31, 2015	Aug. 31, 2014
Schedule Of Trading Securities And Other Trading Assets [Line Items]
Percentage of purchase of shares under tender offer as to common stock issued and outstanding		24.80%
Common stock repurchased, shares	8,000,000
Common stock repurchase, amount				$ 8,085,000	$ 7,988,000	$ 15,098,000
Repurchase of stock cost of repurchase of stock					$ 200
Common stock repurchase authorized amount								$ 10,000,000
Stock repurchase program expiration date				Dec. 31, 2015
Tender Offers [Member]
Schedule Of Trading Securities And Other Trading Assets [Line Items]
Repurchase of shares		8,000,000
Purchase price per share of common stock		$ 7.75
Common stock repurchased, shares		5,237,843
Treasury stock acquired, average purchase price per share		$ 7.75
Total cost of shares repurchased		$ 40,600,000
Common stock repurchase, amount		40,800,000
Repurchase of stock cost of repurchase of stock		$ 200,000
Period of expiration of tender offer				Jun. 8, 2016
Tender Offers [Member] | TCV [Member]
Schedule Of Trading Securities And Other Trading Assets [Line Items]
Common stock repurchased, shares		3,379,249
Tender Offers [Member] | Jay Hoag [Member]
Schedule Of Trading Securities And Other Trading Assets [Line Items]
Percentage of voting securities		5.00%
Tender Offers [Member] | Rogram LLC [Member]
Schedule Of Trading Securities And Other Trading Assets [Line Items]
Common stock repurchased, shares		308,713
June 2016 Repurchase Program [Member]
Schedule Of Trading Securities And Other Trading Assets [Line Items]
Common stock repurchased, shares				749,437	980,329
Common stock repurchase, amount				$ 8,100,000	$ 8,000,000
Common stock repurchase authorized amount							$ 20,000,000
Stock repurchase program expiration date				Jun. 30, 2017
Stock repurchase plan authorized amount remaining for purchases				$ 4,000,000
February 2016 Repurchase Program [Member]
Schedule Of Trading Securities And Other Trading Assets [Line Items]
Common stock repurchase authorized amount			$ 20,000,000
2014 Program [Member]
Schedule Of Trading Securities And Other Trading Assets [Line Items]
Common stock repurchased, shares			0			1,671,687
Common stock repurchase, amount						$ 15,000,000
Common stock repurchase authorized amount									$ 20,000,000
2017 Plan [Member]
Schedule Of Trading Securities And Other Trading Assets [Line Items]
Common stock reserved				8,584,689

Income Taxes - Schedule of Inco

Income Taxes - Schedule of Income Before Provision for Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
U.S.	$ 9,435	$ 3,351	$ 11,040
Foreign	282	1,666	881
Income before provision for income taxes	$ 9,717	$ 5,017	$ 11,921

Income Taxes - Income Tax Provi

Income Taxes - Income Tax Provision (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Current:
Federal	$ 1,543	$ 1,627	$ 2,500
State	419	(569)	167
Foreign	57	415	320
Total current	2,019	1,473	2,987
Deferred:
Federal	598	1,592	796
State	382	(21)	796
Foreign	(85)	(446)	156
Total deferred	895	1,125	1,748
Provision for income taxes	$ 2,914	$ 2,598	$ 4,735

Income Taxes - Additional Infor

Income Taxes - Additional Information (Detail) - USD ($)	3 Months Ended	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Taxes [Line Items]
Corporate tax rate			35.00%
Tax cuts and jobs act of 2017, incomplete accounting, income tax expense (benefit)	$ (400,000)
Remesurement of deferred tax assets and liabilities, income tax expense (benefit)			$ (376,000)
Provisional amount related to deemed repatriation foreign earnings			45,000
Cumulative foreign earnings net of deficits			900,000
Net decrease in deferred tax assets and liabilities			(400,000)
Valuation allowance	352,000		352,000	$ 443,000
Decrease in valuation allowance			91,000	$ 85,000	$ 686,000
Unrecognized tax expenses	0		0		$ 184,000	$ 672,000
Undistributed earnings, foreign subsidiaries	5,700,000		5,700,000
Foreign Country [Member]
Income Taxes [Line Items]
NOL carryforwards	$ 700,000		$ 700,000
NOL carryforwards expiration year			Dec. 31, 2022
Scenario, Forecast [Member]
Income Taxes [Line Items]
Corporate tax rate		21.00%

Income Taxes - Difference by Ap

Income Taxes - Difference by Applying the Statutory Federal Income Tax Rate (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Provision computed at statutory rate	$ 3,401	$ 1,757	$ 4,172
Increase resulting from:
Difference in rates for foreign jurisdictions	37	(146)	(181)
Tax exempt interest income	(12)	(21)	(6)
Stock-based compensation	(304)	315	(430)
Other non-deductible expenses	(101)	67	14
Non-deductible officers compensation	447	738	408
State income tax provision	653	(380)	573
Losses not benefitted	4	1	9
Subsidiary earnings taxed in the US	127	253
True-up of prior year returns	(161)	11	197
Research and development credit	(801)
Tax Cuts and Jobs Act of 2017	(376)
Other		3	(21)
Provision for income taxes	$ 2,914	$ 2,598	$ 4,735

Income Taxes - Significant Comp

Income Taxes - Significant Components of the Company's Net Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Deferred tax assets:
Net operating loss carryforwards	$ 166	$ 308
Deferred revenue	187	187
Accruals and allowances	972	1,721
Stock-based compensation	815	1,656
Deferred rent expense	1,327	809
Other	4
Gross deferred tax assets	3,471	4,681
Less valuation allowance	(352)	(443)
Total deferred tax assets	3,119	4,238
Deferred tax liabilities:
Intangible asset amortization	(2,036)	(1,865)
Depreciation	(1,823)	(2,434)
Total deferred tax liabilities	(3,859)	(4,299)
Net deferred tax liabilities	(740)	(61)
As reported:
Non-current deferred tax assets	98	139
Non-current deferred tax liabilities	$ 838	$ 200

Income Taxes - Reconciliation o

Income Taxes - Reconciliation of the Beginning and Ending Amounts of Unrecognized Tax Benefits (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Balance at beginning of year	$ 184	$ 672
Reductions due to amnesty and settlement	(188)	(160)
Payments		(336)
Gross increases related to positions taken in prior periods	$ 4	8
Balance at end of year		$ 184

Segment Information - Additiona

Segment Information - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2017Segment
Segment Reporting [Abstract]
Number of operating segment	1

Segment Information - Net Sales

Segment Information - Net Sales to Unaffiliated Customers by Geographic Area (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales, Total	$ 30,303	$ 28,012	$ 26,664	$ 23,577	$ 26,670	$ 25,750	$ 29,174	$ 25,031	$ 108,556	$ 106,625	$ 111,826
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales, Total									77,982	79,535	85,284
United Kingdom [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales, Total									12,544	9,944	10,999
Other International [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales, Total									$ 18,030	$ 17,146	$ 15,543

Segment Information - Long-Live

Segment Information - Long-Lived Assets by Geographic Area (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets, Total	$ 104,085	$ 103,302
U.S. [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets, Total	98,683	98,330
International [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets, Total	$ 5,402	$ 4,972

401(k) Plan - Additional Inform

401(k) Plan - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Defined Contribution Plan Disclosure [Line Items]
Company's contribution to the plan, percentage	50.00%
Company's contribution to the plan, amount	$ 900,000	$ 900,000	$ 900,000
Company's matching contributions vesting annually	25.00%
Company's matching contributions vesting after four consecutive years of service	100.00%
Vesting period identified for vesting purpose	4 years
Maximum [Member]
Defined Contribution Plan Disclosure [Line Items]
Annual contribution by employer	$ 2,000

Quarterly Financial Data - Quar

Quarterly Financial Data - Quarterly Financial Data (Unaudited) (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Quarterly Financial Information Disclosure [Abstract]
Total revenues	$ 30,303	$ 28,012	$ 26,664	$ 23,577	$ 26,670	$ 25,750	$ 29,174	$ 25,031	$ 108,556	$ 106,625	$ 111,826
Total cost of revenues	7,364	6,951	7,085	6,936	7,808	7,612	7,604	7,193	28,336	30,217	29,903
Total gross profit	22,939	21,061	19,579	16,641	18,862	18,138	21,570	17,838	80,220	76,408	81,923
Total operating expenses	17,719	18,174	17,094	16,823	17,162	17,589	17,266	17,600	69,810	69,617	69,753
Operating income	5,220	2,887	2,485	(182)	1,700	549	4,304	238	10,410	6,791	12,170
Net income (loss)	$ 3,397	$ 2,074	$ 1,361	$ (29)	$ 90	$ (22)	$ 2,399	$ (48)	$ 6,803	$ 2,419	$ 7,186
Net income (loss) per common share:
Basic	$ 0.12	$ 0.08	$ 0.05	$ 0	$ 0	$ 0	$ 0.08	$ 0	$ 0.25	$ 0.08	$ 0.22
Diluted	$ 0.12	$ 0.07	$ 0.05	$ 0	$ 0	$ 0	$ 0.07	$ 0	$ 0.24	$ 0.08	$ 0.21