TechTarget (TTGT) 10-Q 3 Nov 21 2021 Q3 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2021	Oct. 29, 2021
Cover [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2021
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q3
Entity Registrant Name	TECHTARGET, INC.
Entity Central Index Key	0001293282
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Emerging Growth Company	false
Entity Small Business	false
Entity Common Stock, Shares Outstanding		28,819,686
Entity Shell Company	false
Title of 12(b) Security	Common Stock, $0.001 Par Value
Trading Symbol	TTGT
Security Exchange Name	NASDAQ
Entity File Number	1-33472
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	04-3483216
Entity Address, Address Line One	275 Grove Street
Entity Address, City or Town	Newton
Entity Address, State or Province	MA
Entity Address, Postal Zip Code	02466
City Area Code	617
Local Phone Number	431-9200
Document Quarterly Report	true
Document Transition Report	false

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Current assets:
Cash	$ 99,383	$ 82,616
Short-term investments	5,085	84
Accounts receivable, net of allowance for doubtful accounts of $1,928 and $1,754 respectively	45,528	40,183
Prepaid taxes	4,532	796
Prepaid expenses and other current assets	4,782	4,084
Total current assets	159,310	127,763
Property and equipment, net	17,467	13,661
Goodwill	197,108	179,118
Intangible assets, net	112,651	108,872
Operating lease assets with right-of-use	21,626	26,031
Deferred tax assets	228	216
Other assets	964	907
Total assets	509,354	456,568
Current liabilities:
Accounts payable	2,956	4,303
Current operating lease liability	3,675	3,611
Accrued expenses and other current liabilities	15,750	16,539
Accrued compensation expenses	11,194	5,789
Income taxes payable		487
Contract liabilities	29,689	15,689
Total current liabilities	63,264	46,418
Non-current lease liability	22,677	26,943
Convertible debt	195,631	153,882
Other liabilities	3,174	2,971
Deferred tax liabilities	16,087	23,848
Total liabilities	300,833	254,062
Leases and contingencies (see Note 9)
Stockholders’ equity:
Preferred stock, $0.001 par value; 5,000,000 shares authorized; no shares issued or outstanding
Common stock, $0.001 par value; 100,000,000 shares authorized; 56,330,528 and 55,633,155 shares issued, respectively; 28,819,686 and 28,122,603 shares outstanding, respectively	56	56
Treasury stock, at cost; 27,510,842 and 27,510,552 shares, respectively	(199,796)	(199,796)
Additional paid-in capital	353,644	363,055
Accumulated other comprehensive income	(110)	1,611
Retained earnings	54,727	37,580
Total stockholders’ equity	208,521	202,506
Total liabilities and stockholders’ equity	$ 509,354	$ 456,568

Condensed Consolidated Balanc_2

Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Statement Of Financial Position [Abstract]
Allowance for doubtful accounts, accounts receivable	$ 1,928	$ 1,754
Preferred stock, par value	$ 0.001	$ 0.001
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	56,330,528	55,633,155
Common stock, shares outstanding	28,819,686	28,122,603
Treasury stock, shares	27,510,842	27,510,552

Condensed Consolidated Statemen

Condensed Consolidated Statements of Income and Comprehensive Income - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Income Statement [Abstract]
Revenue		$ 69,751	$ 36,244	$ 186,431	$ 102,456
Cost of revenue	[1]	16,805	9,212	49,087	26,148
Amortization of acquired technology		766		2,307
Gross profit		52,180	27,032	135,037	76,308
Operating expenses:
Selling and marketing	[1]	25,403	13,792	69,108	39,311
Product development	[1]	2,790	1,961	8,247	5,839
General and administrative	[1]	13,432	3,355	26,075	9,976
Depreciation, excluding depreciation of $503, $274, $1,330 and $666, respectively, included in cost of revenue		1,454	1,202	4,063	3,559
Amortization		1,969	250	5,257	691
Total operating expenses		45,048	20,560	112,750	59,376
Operating income		7,132	6,472	22,287	16,932
Interest and other income (expense), net		(199)	91	(1,381)	(388)
Income before provision for income taxes		6,933	6,563	20,906	16,544
(Benefit) Provision for income taxes		(3,051)	(219)	3,992	2,782
Net income		9,984	6,782	16,914	13,762
Other comprehensive income (loss), net of tax:
Unrealized income (loss) on investments (net of tax provision of $0, $3, $0 and $(10), respectively)			12		(36)
Foreign currency translation gain (loss)		(3,330)	210	(1,721)	178
Other comprehensive income (loss)		(3,330)	222	(1,721)	142
Comprehensive income		$ 6,654	$ 7,004	$ 15,193	$ 13,904
Net income per common share:
Basic		$ 0.35	$ 0.24	$ 0.60	$ 0.50
Diluted		$ 0.32	$ 0.24	$ 0.56	$ 0.48
Weighted average common shares outstanding:
Basic		28,473,000	27,781,000	28,255,000	27,773,000
Diluted		32,266,768	28,472,599	32,170,263	28,411,925
[1]	Amounts include stock-based compensation expense as follows:

Condensed Consolidated Statem_2

Condensed Consolidated Statements of Income and Comprehensive Income (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Depreciation included in cost of revenues	$ 503	$ 274	$ 1,330	$ 666
Unrealized income (loss) on investments, tax effect	0	3	0	10
Cost of Revenue [Member]
Allocated stock-based compensation expense	435	121	1,331	260
Selling and Marketing [Member]
Allocated stock-based compensation expense	5,305	2,849	12,363	7,155
Product Development [Member]
Allocated stock-based compensation expense	139	117	915	438
General and Administrative [Member]
Allocated stock-based compensation expense	$ 8,437	$ 1,236	$ 12,319	$ 3,191

Condensed Consolidated Statem_3

Condensed Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands		Total	Reclassification Adjustment [Member]	Common Stock [Member]	Treasury Stock [Member]	Additional Paid-in Capital [Member]	Additional Paid-in Capital [Member]Reclassification Adjustment [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Retained Earnings [Member]	Retained Earnings [Member]Reclassification Adjustment [Member]
Beginning balance at Dec. 31, 2019		$ 152,951		$ 55	$ (184,972)	$ 317,675		$ (319)	$ 20,512
Beginning balance, shares at Dec. 31, 2019				54,903,824	26,761,305
Issuance of common stock from restricted stock awards, shares				123,027
Purchase of common stock through stock buyback		(14,824)			$ (14,824)
Purchase of common stock through stock buyback, shares					736,760
Impact of net settlements		(68)				(68)
Impact of net settlements, shares				230	230
Stock-based compensation expense	[1]	5,294				5,294
Comprehensive income:
Unrealized gain (loss) on investments		(132)						(132)
Unrealized gain (loss) on foreign currency exchange		(53)						(53)
Net income		2,207							2,207
Ending balance at Mar. 31, 2020		145,375		$ 55	$ (199,796)	322,901		(504)	22,719
Ending balance, shares at Mar. 31, 2020				55,027,081	27,498,295
Beginning balance at Dec. 31, 2019		152,951		$ 55	$ (184,972)	317,675		(319)	20,512
Beginning balance, shares at Dec. 31, 2019				54,903,824	26,761,305
Comprehensive income:
Unrealized gain (loss) on investments		(36)
Net income		13,762
Ending balance at Sep. 30, 2020		162,256		$ 56	$ (199,796)	327,899		(177)	34,274
Ending balance, shares at Sep. 30, 2020				55,608,094	27,509,387
Beginning balance at Dec. 31, 2019		152,951		$ 55	$ (184,972)	317,675		(319)	20,512
Beginning balance, shares at Dec. 31, 2019				54,903,824	26,761,305
Ending balance at Dec. 31, 2020		202,506		$ 56	$ (199,796)	363,055		1,611	37,580
Ending balance (ASU 2020-06) at Dec. 31, 2020			$ (30,267)				$ (30,500)			$ 233
Ending balance, shares at Dec. 31, 2020				55,633,155	27,510,552
Beginning balance at Mar. 31, 2020		145,375		$ 55	$ (199,796)	322,901		(504)	22,719
Beginning balance, shares at Mar. 31, 2020				55,027,081	27,498,295
Issuance of common stock from restricted stock awards, shares				8,000
Stock-based compensation expense		3,293				3,293
Comprehensive income:
Unrealized gain (loss) on investments		84						84
Unrealized gain (loss) on foreign currency exchange		21						21
Net income		4,773							4,773
Ending balance at Jun. 30, 2020		153,546		$ 55	$ (199,796)	326,194		(399)	27,492
Ending balance, shares at Jun. 30, 2020				55,035,081	27,498,295
Issuance of common stock from restricted stock awards		461		$ 1		460
Issuance of common stock from restricted stock awards, shares				561,921
Impact of net settlements		(3,078)				(3,078)
Impact of net settlements, shares				11,092	11,092
Stock-based compensation expense		4,323				4,323
Comprehensive income:
Unrealized gain (loss) on investments		12						12
Unrealized gain (loss) on foreign currency exchange		210						210
Net income		6,782							6,782
Ending balance at Sep. 30, 2020		162,256		$ 56	$ (199,796)	327,899		(177)	34,274
Ending balance, shares at Sep. 30, 2020				55,608,094	27,509,387
Beginning balance at Dec. 31, 2020		202,506		$ 56	$ (199,796)	363,055		1,611	37,580
Beginning balance, shares at Dec. 31, 2020				55,633,155	27,510,552
Issuance of common stock from restricted stock awards, shares				24,815
Impact of net settlements		(370)				(370)
Impact of net settlements, shares				290	290
Stock-based compensation expense	[1]	7,425				7,425
Comprehensive income:
Unrealized gain (loss) on foreign currency exchange		1,034						1,034
Net income		1,810							1,810
Ending balance at Mar. 31, 2021		182,138		$ 56	$ (199,796)	339,610		2,645	39,623
Ending balance, shares at Mar. 31, 2021				55,658,260	27,510,842
Beginning balance at Dec. 31, 2020		$ 202,506		$ 56	$ (199,796)	363,055		1,611	37,580
Beginning balance (ASU 2020-06) at Dec. 31, 2020			$ (30,267)				$ (30,500)			$ 233
Beginning balance, shares at Dec. 31, 2020				55,633,155	27,510,552
Issuance of common stock from exercise of options, shares		2,500
Comprehensive income:
Net income		$ 16,914
Ending balance at Sep. 30, 2021		208,521		$ 56	$ (199,796)	353,644		(110)	54,727
Ending balance, shares at Sep. 30, 2021				56,330,528	27,510,842
Beginning balance at Mar. 31, 2021		182,138		$ 56	$ (199,796)	339,610		2,645	39,623
Beginning balance, shares at Mar. 31, 2021				55,658,260	27,510,842
Issuance of common stock from exercise of options		16				16
Issuance of common stock from exercise of options, shares				2,500
Issuance of common stock from restricted stock awards, shares				9,125
Registration fees		(29)				(29)
Stock-based compensation expense		6,012				6,012
Comprehensive income:
Unrealized gain (loss) on foreign currency exchange		575						575
Net income		5,120							5,120
Ending balance at Jun. 30, 2021		193,832		$ 56	$ (199,796)	345,609		3,220	44,743
Ending balance, shares at Jun. 30, 2021				55,669,885	27,510,842
Issuance of common stock from restricted stock awards, shares				660,643
Stock-based compensation expense	[2]	8,035				8,035
Comprehensive income:
Unrealized gain (loss) on foreign currency exchange		(3,330)						(3,330)
Net income		9,984							9,984
Ending balance at Sep. 30, 2021		$ 208,521		$ 56	$ (199,796)	$ 353,644		$ (110)	$ 54,727
Ending balance, shares at Sep. 30, 2021				56,330,528	27,510,842
[1]	Includes $0.8 and $1.8 million of accrued compensation expense expensed in previous year for the three months ended March 31, 2021 and 2020, respectively
[2]	Excludes $6.3 million of accrued compensation expense that has not been issued for the three months ended September 30, 2021

Condensed Consolidated Statem_4

Condensed Consolidated Statements of Stockholders' Equity (Parenthetical) - USD ($) $ in Millions	3 Months Ended
	Sep. 30, 2021	Mar. 31, 2021	Mar. 31, 2020
Statement Of Stockholders Equity [Abstract]
Accrued compensation expense	$ 6.3	$ 0.8	$ 1.8

Condensed Consolidated Statem_5

Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Operating activities:
Net income	$ 16,914	$ 13,762
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	5,393	4,225
Amortization	7,564	691
Provision for bad debt	43	303
Stock-based compensation	26,928	11,044
Amortization of debt issuance costs	982	7
Deferred tax provision	2,839	158
Changes in operating assets and liabilities:
Accounts receivable	(5,388)	2,419
Prepaid expenses and other current assets	(5,596)	(3,094)
Other assets	390	30
Accounts payable	(1,298)	(412)
Income taxes payable	308	953
Accrued expenses and other current liabilities	(6,295)	(190)
Operating lease right-of-use assets and liabilities, net	224	(263)
Accrued compensation expenses	48	(516)
Contract liabilities	13,823	2,366
Other liabilities	207	1,865
Net cash provided by operating activities	57,086	33,348
Investing activities:
Purchases of property and equipment, and other capitalized assets, net	(9,245)	(4,943)
Purchases of investments and maturities of investments	(5,001)	(96)
Acquisitions of businesses, net	(24,346)	(5,015)
Net cash used in investing activities	(38,592)	(10,054)
Financing activities:
Tax withholdings related to net share settlements	(370)	(3,146)
Purchase of treasury shares and related costs		(14,824)
Registration fees	(29)
Debt issuance costs		(11)
Proceeds from stock option exercises	16	460
Payment of earnout liabilities	(1,059)
Term loan principal payment		(938)
Net cash used in financing activities	(1,442)	(18,459)
Effect of exchange rate changes on cash	(285)	86
Net increase in cash	16,767	4,921
Cash at beginning of period	82,616	52,487
Cash at end of period	99,383	57,408
Supplemental disclosure of cash flow information:
Cash paid for taxes, net	$ 5,367	$ 4,906

Organization and Operations

Organization and Operations	9 Months Ended
	Sep. 30, 2021
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Organization and Operations	1. Organization and Operations TechTarget, Inc. and its subsidiaries (collectively, the “Company”) is a global data and analytics leader and software provider for buyers of purchase intent-driven marketing and sales data for enterprise technology vendors. The Company’s service offerings enable technology vendors to better identify, reach and influence corporate information technology (“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 by customized marketing programs that integrate demand generation, brand advertising techniques, and content curation and creation. The Company operates a network of approximately 150 websites and 1,125 webinars and virtual event channels, which each focus 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 and webinars and virtual event channels for purchasing decision support. The Company’s content platforms enable 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 platforms on which business-to-business technology companies can launch targeted marketing campaigns which generate measurable return on investment. Based upon the logical clustering of members and users’ 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 market categories: Security; Networking; Storage; Data Center and Virtualization Technologies; CIO/IT Strategy; Business Applications and Analytics; Application Architecture and Development; and ANCL Channel.

Summary of Significant Accounti

Summary of Significant Accounting Policies	9 Months Ended
	Sep. 30, 2021
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	2. Summary of Significant Accounting Policies The accompanying condensed consolidated financial statements reflect the application of certain significant accounting policies as described below and elsewhere in these Notes to Condensed Consolidated Financial Statements. The Company’s critical accounting policies are those that affect its more significant judgments used in the preparation of its condensed consolidated financial statements. A description of the Company’s critical accounting policies and estimates is contained in its Annual Report on Form 10-K for the fiscal year ended December 31, 2020, and in this note to the condensed consolidated financial statements. Principles of Consolidation The accompanying Condensed 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 (Australia) Pty Ltd., TechTarget (Singapore) Pte Ltd., E-Magine Médias SAS (“LeMagIT”), TechTarget Germany GmbH and as of December 23, 2020, BrightTALK Limited and its wholly owned subsidiary, BrightTALK, Inc. (collectively, the “BrightTALK subsidiaries”). 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. 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. The BrightTALK subsidiaries are entities through which the Company does business for the BrightTALK webinar and virtual event and audience delivery platform. Basis of Presentation The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted (Generally Accepted Accounting Principles or “U.S. GAAP”) in the United States (“U.S.”) for interim financial information and with the instructions to Form 10-Q and Rule 10-01 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by U.S. GAAP for complete financial statements. All adjustments, which, in the opinion of management, are considered necessary for a fair presentation of the results of operations for the periods shown, are of a normal, recurring nature and have been reflected in the condensed consolidated financial statements. The results of operations for the periods presented are not necessarily indicative of results to be expected for any other interim periods or for the full year. The information included in these condensed consolidated financial statements should be read in conjunction with “Management’s Discussion and Analysis of Financial Condition and Results of Operations” contained in this report and the condensed consolidated financial statements and accompanying notes included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2020. Reclassifications The Company historically presented depreciation and amortization expense as one combined line item on the Condensed Consolidated Statements of Income and Comprehensive Income. Due to the Company’s recent acquisitions, the materiality of amortization expense has increased and the Company has elected to present these expenses in two separate line items for all periods presented. This reclassification had no effect on total operating expenses or net income. Foreign Currency The functional currency of the Company’s major foreign subsidiaries is generally the local currency. Adjustments resulting from translating foreign functional currency financial statements into U.S. dollars are recorded as a separate component on the Condensed Consolidated Statement of Comprehensive Income. Foreign currency transaction gains and losses are included in interest and other income (expense), net in the Condensed Consolidated Statement of Income. All assets and liabilities denominated in foreign currency are translated into U.S. dollars at the exchange rate on the balance sheet date. Revenue and expenses are translated at the average exchange rate during the period. Use of Estimates The preparation of condensed consolidated financial statements in conformity with U.S. 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 condensed consolidated financial statements and the reported amounts of revenue and expenses during the reporting period. On an ongoing basis, the Company evaluates its estimates, including those related to revenue, long-lived assets, goodwill, the allowance for doubtful accounts, stock-based compensation, self-insurance accruals, and income taxes. The Company reduces its accounts receivable for an allowance for doubtful accounts based on its best estimate of the amount of probable credit losses. 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 its revenue from the sale of purchase intent data and marketing and sales services, which it delivers via its network of websites, webinar and virtual event channels, and data analytics solutions. Revenue is recognized when performance obligations are satisfied by transferring promised goods or services to customers, as determined by applying a five-step process consisting of: a) identifying the contract, or contracts, with a customer, b) identifying the performance obligations in the contract, c) determining the transaction price, d) allocating the transaction price to the performance obligations in the contract, and e) recognizing revenue when, or as, performance obligations are satisfied. Accounts Receivable We maintain an allowance for credit losses for expected uncollectible accounts receivable, which is recorded as an offset to accounts receivable and changes in such are classified as general and administrative expense in the Condensed Consolidated Statements of Income and Comprehensive Income. We assess collectability by reviewing accounts receivable on an individual basis when we identify specific customers with known disputes, overdue amounts or collectability issues and also reserve for losses on all accounts based on historical information, current market conditions and reasonable and supportable forecasts of future economic conditions to inform adjustments to historical loss data. In determining the amount of the allowance for credit losses, we consider historical collectability based on past due status and make judgments about the creditworthiness of customers based on ongoing credit evaluations. At September 30, 2021, the Company’s collectability assessment continues to include the business and market disruptions caused by COVID-19 and estimates of expected emerging credit and collectability trends. The continued volatility in market conditions and evolving shifts in credit trends are difficult to predict, causing variability and volatility that may have a material impact on our allowance for credit losses in future periods. Fair Value of Financial Instruments Financial instruments consist of cash and cash equivalents, short-term investments, accounts receivable, accounts payable, and contingent consideration. Due to their short-term nature and liquidity, the carrying value of these instruments, with the exception of contingent consideration, approximates their estimated fair values. The Company classifies all of its short-term investments as available-for-sale. The fair value of contingent consideration was estimated using a discounted cash flow method. Business Combinations The Company uses its best estimates and assumptions to assign fair value to the tangible and intangible assets acquired and During the measurement period, which may be up to one year from the acquisition date, the Company may record adjustments to the fair value of these tangible and intangible assets acquired and liabilities assumed, with the corresponding offset to goodwill. In addition, uncertain tax positions and tax-related valuation allowances are initially recorded in connection with a business combination as of the acquisition date. The Company continues to collect information and reevaluates these estimates and assumptions quarterly and records any adjustments to the Company’s preliminary estimates to goodwill provided that the Company is within the measurement period. Upon the conclusion of the measurement period or final determination of the fair value of assets acquired or liabilities assumed, whichever comes first, any subsequent adjustments are recorded to the Company’s Condensed Consolidated Statement of Income and Comprehensive Income. Other Liabilities Other liabilities consist of the long-term portions of amounts payable related to our acquisition of substantially all of the assets of Xtelligent Healthcare Media, LLC and the amounts deferred under the Coronavirus Aid, Relief and Economic Security Act (the “CARES Act”) which allows employers to defer the payment of the Company’s employer share of FICA payroll taxes. The amount of the employer share of FICA payroll taxes (6.2% of the first $137,700 of employee pay) due for the period beginning on March 27, 2020, and ending December 31, 2020, were deferred. The deferred amounts are payable in equal installments at December 31, 2021 and December 31, 2022. Amounts relating to the payment due December 31, 2021 of $1.2 million are included in accrued expenses as of September 30, 2021. Recent Accounting Pronouncements Recently Adopted Accounting Guidance In January 2017, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“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. We adopted the new standard effective January 1, 2020 and the guidance did not have a material impact on our condensed consolidated financial statements. In August 2018, the FASB issued ASU No. 2018-15, Intangibles-Goodwill and Other-Internal-Use Software (Subtopic 350-40): Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement that is a Service Contract (ASU 2018-15), which requires implementation costs incurred by customers in cloud computing arrangements (i.e. hosting arrangements) to be capitalized under the same premises of authoritative guidance for internal-use software, and deferred over the non-cancellable term of the cloud computing arrangements plus any optional renewal periods that are reasonably certain to be exercised by the customer or for which the exercise is controlled by the service provider. ASU 2018-15 is effective for fiscal years beginning after December 15, 2019, and interim periods within those fiscal years, with early adoption permitted. We adopted the new standard effective January 1, 2020 and the guidance did not have a material impact on our condensed consolidated financial statements. In June 2016, the FASB issued ASU No. 2016-03, “Measurement of Credit Losses on Financial Instruments,” (ASU 2016-03) which amends ASC 326 “Financial Instruments—Credit Losses” which introduces a new methodology for accounting for credit losses on financial instruments. The guidance establishes a new forward-looking "expected loss model" that requires entities to estimate current expected credit losses on accounts receivable and financial instruments by using all practical and relevant information. We adopted the new standard effective January 1, 2020 and the guidance did not have a material impact on our condensed consolidated financial statements. In August 2018, the FASB issued ASU No. 2018-13, “Changes to Disclosure Requirements for Fair Value Measurements” (Topic 820) (ASU 2018-13), which improved the effectiveness of disclosure requirements for recurring and nonrecurring fair value measurements. The standard removes, modifies, and adds certain disclosure requirements. We adopted the new standard effective January 1, 2020 and the guidance did not have a material impact on our condensed consolidated financial statements. In December 2019, the FASB issued ASU No. 2019-12 (ASU 2019-12), Simplifying the Accounting for Income Taxes (Topic 740). ASU 2019-12 removes certain exceptions for performing intraperiod tax allocations, recognizing deferred taxes for investments, and calculating income taxes in interim periods. The guidance also simplifies the accounting for franchise taxes, transactions that result in a step-up in the tax basis of goodwill, and the effect of enacted changes in tax laws or rates in interim periods. The Company adopted ASU 2019-12 effective January 1, 2021 and the guidance did not In August 2020, the FASB issued No. ASU 2020-06, Debt – Debt with Conversion and Other Options (Subtopic 470-20) and Derivatives and Hedging – Contracts in Entity’s own Equity (Subtopic 815-40), which simplifies the accounting for certain financial instruments with characteristics of liabilities and equity, including convertible debt instruments and contracts on an entity’s own equity. Among other things, the standard removes certain accounting models which require bifurcation from the host contract of certain features of convertible debt instruments, unless the feature qualifies as a derivative under ASC 815. Additionally, companies are required to use the if-converted method for convertible instruments in their calculations of diluted earnings per share. Early adoption is permitted but no earlier than the fiscal year beginning after December 15, 2020. The Company elected to early adopt ASU 2020-06 effective January 1, 2021. The Company has elected the modified retrospective method to transition to the guidance. The modified retrospective method requires the Company to 1) Recombine our convertible notes into a single instrument by reclassifying the amount initially recorded to the equity component against the outstanding debt on the convertible notes. 2) Reclassify an amount from retained earnings equal to the difference between the sum of the carrying values of the debt and the conversion feature immediately before transition and the revised amortized cost of the combined convertible instrument under the traditional debt model as of the transition date. 3) Post-transition, account for the convertible notes as a single instrument recognizing interest expense based on the applicable and recalculated effective interest rate and continue to apply the if-converted method in the Company’s calculation of diluted earnings per share. The following table summarizes the impact of the adoption of ASU 2020-06 on the Company’s condensed consolidated financial statements: December 31, 2020 January 1, 2021 Change Convertible Debt $ 153,882 $ 194,649 $ 40,767 Additional Paid-in Capital 363,055 332,555 (30,500 ) Retained Earnings 37,580 37,813 233 Deferred Tax Liabilities 23,848 13,348 (10,500 ) Total $ —

Revenue

Revenue	9 Months Ended
	Sep. 30, 2021
Revenue Recognition [Abstract]
Revenue	3. Revenue Disaggregation of Revenue The following table depicts the disaggregation of revenue according to categories consistent with how the Company evaluates its financial performance and economic risk. International revenue consists of international geo-targeted campaigns, which are campaigns targeted at an audience of members outside of North America. For the Three Months Ended September 30, For the Nine Months Ended September 30, 2021 2020 2021 2020 North America $ 41,852 $ 21,663 $ 114,306 $ 62,518 International 27,899 14,581 72,125 39,938 Total $ 69,751 $ 36,244 $ 186,431 $ 102,456 Contract Liabilities Timing may differ between the satisfaction of performance obligations and the invoicing and collections of amounts related to the Company’s contracts with customers. Liabilities are recorded for amounts that are collected in advance of the satisfaction of performance obligations. Additionally, certain customers may receive credits, which are accounted for as a material right. The Company estimates these amounts based on the expected amount of future services to be provided to the customer and allocates a portion of the transaction price to these material rights. The Company recognizes these material rights as the material rights are exercised. The resulting material rights amount included in the contract liabilities on the accompanying Condensed Consolidated Balance Sheets was $2.1 million and $2.2 million at September 30, 2021, and December 31, 2020, respectively. Revenue recognized for the three and nine months ended September 30, 2021, respectively that had been recorded in deferred revenue at the beginning of the respective quarters, was $14.8 million and $42.9 million. Contract Liabilities Year-to-Date Activity Balance at December 31, 2020 $ 15,689 Billings 62,341 Revenue Recognized (52,969 ) Balance at March 31, 2021 $ 25,061 Billings 66,504 Revenue Recognized (63,711 ) Balance at June 30, 2021 $ 27,854 Billings 71,586 Revenue Recognized (69,751 ) Balance at September 30, 2021 $ 29,689 The Company elected to apply the following practical expedients: • Existence of a Significant Financing Component in a Contract . As a practical expedient, the Company has not assessed whether a contract has a significant financing component because the Company expects at contract inception that the period between payment by the customer and the transfer of promised goods or services by the Company to the customer will be one year or less. Payment terms and conditions vary by contract type, although terms generally include a requirement of payment within 30 to 90 days. In addition, the Company has determined that the payment terms that the Company provides to its customers are structured primarily for reasons other than the provision of financing to the customer. • Costs to Fulfill a Contract . The Company’s revenue is primarily generated from customer contracts that are for one year or less. Costs primarily consist of incentive compensation paid based on the achievement of sales targets. As a practical expedient, for amortization periods that are determined to be one year or less, the Company expenses any incremental costs of obtaining the contract with a customer when incurred. For those customer contracts greater than one year, the Company capitalizes and amortizes the expenses over the period of benefit. • Revenue Invoiced . The Company has applied the practical expedient for certain revenue streams to exclude the value of remaining performance obligations for (i) contracts with an original expected term of one year or less or (ii) contracts for which the Company recognizes revenue in proportion to the amount it has the right to invoice for services performed.

Fair Value Measurements

Fair Value Measurements	9 Months Ended
	Sep. 30, 2021
Fair Value Disclosures [Abstract]
Fair Value Measurements	4. Fair Value Measurements The Company measures certain financial assets and liabilities at fair value on a recurring basis, including short-term and long-term investments and contingent consideration. T he Company’s bank and money market accounts are in bank deposits and are not quoted instruments. As such, the Company’s bank and money market accounts are all considered cash. The fair value of these financial assets and liabilities carried at fair value was determined based on three levels of input • Level 1. • Level 2. • Level 3. The fair value hierarchy of the Company’s financial assets carried at fair value and measured on a recurring basis is as follows: Fair Value Measurements at September 30, 2021 September 30, 2021 Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Assets: Short-term investments (1) $ 5,085 $ — $ 5,085 $ — Total assets $ 5,085 $ — $ 5,085 $ — Liabilities: Contingent consideration - current (2) $ 3,116 $ — $ — $ 3,116 Contingent consideration - non-current (2) $ 1,954 $ — $ — $ 1,954 Total liabilities $ 5,070 $ — $ — $ 5,070 Fair Value Measurements at December 31, 2020 December 31, 2020 Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Assets: Short-term investments (1) $ 84 $ — $ 84 $ — Total assets $ 84 $ — $ 84 $ — Liabilities: Contingent consideration - current (2) $ 1,027 $ — $ — $ 1,027 Contingent consideration - non-current (2) 1,751 — — 1,751 Total liabilities $ 2,778 $ — $ — $ 2,778 (1) (2) Contingent consideration liabilities are measured using the income approach and discounted to present value based on an assessment of the probability that the Company would be required to make such future payments. The contingent consideration liabilities are measured at fair value using significant L evel 3 (unobservable) inputs such as discount rates and probability measures. Remeasurement of the contingent consideration to fair value is reported in the income statement as amortization expense in the period remeasured . Amounts due within twelve months are included in accrued expenses a nd amounts due exceeding twelve months are included as other liabilities. Fair Value Year-to-Date Activity Balance at December 31, 2020 $ 2,778 Payments on Contingent Liabilities (1,032 ) Amortization of discount on contingent liabilities 53 Remeasurement of contingent liabilities 185 Balance at March 31, 2021 $ 1,984 Amortization of discount on contingent liabilities 44 Remeasurement of contingent liabilities 209 Balance at June 30, 2021 $ 2,237 Payments on Contingent Liabilities (27 ) Amortization of discount on contingent liabilities 31 Remeasurement of contingent liabilities 329 Liabilities resulting from acquisitions 2,500 Balance at September 30, 2021 $ 5,070

Cash and Investments

Cash and Investments	9 Months Ended
	Sep. 30, 2021
Cash And Cash Equivalents [Abstract]
Cash and Investments	5. Cash and Investments Cash is carried at cost, which approximates fair market value. As of September 30, 2021 and December 31, 2020, cash consisted of $99.4 million and $82.6 million respectively. Investments are recorded at fair value with the related unrealized gains and losses included in accumulated other comprehensive income, a component of stockholders’ equity, net of tax. Realized gains and losses on the sale of these investments are determined using the specific identification method. There were no realized gains or losses as of September 30, 2021 or December 31, 2020. Short-term investments consisted of the following: September 30, 2021 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Estimated Fair Value Short-term investments: Bond funds $ 5,084 $ 1 $ — $ 5,085 Total short-term investments $ 5,084 $ 1 $ — $ 5,085 December 31, 2020 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Estimated Fair Value Short-term investments: Bond funds $ 84 $ — $ — $ 84 Total short-term investments $ 84 $ — $ — $ 84

Goodwill and Intangible Assets

Goodwill and Intangible Assets	9 Months Ended
	Sep. 30, 2021
Goodwill And Intangible Assets Disclosure [Abstract]
Goodwill and Intangible Assets	6. Goodwill and Intangible Assets Goodwill and indefinite-lived intangible assets are not amortized but are reviewed annually for impairment or more frequently if impairment indicators arise. The Company did not have any intangible assets with indefinite lives other than goodwill as of September 30, 2021 or December 31, 2020. There were no indications of impairment as of September 30, 2021, and the Company believes that, as of the balance sheet dates presented, none of the Company’s goodwill or intangible assets were impaired. Goodwill increased $18.0 million and $3.5 million for the nine months ended September 30, 2021 and 2020 respectively. $16.1M of the 2021 increase is from the purchase of Xtelligent Healthcare Media, LLC, with other changes primarily from translation adjustments booked to other comprehensive income. $3.4 million of the 2020 increase was from the purchase of Data Science Central, LLC, with other changes primarily from translation adjustments booked to other comprehensive income. The following table summarizes the Company’s intangible assets, net: September 30, 2021 Estimated Useful Lives (Years) Gross Carrying Amount Accumulated Amortization Net Customer, affiliate and advertiser relationships 5-19 $ 85,572 $ (10,299 ) $ 75,273 Developed websites, technology and patents 10 34,877 (3,657 ) 31,220 Trademark, trade name and domain name 5-16 7,902 (2,219 ) 5,683 Proprietary user information database and internet traffic 5 1,135 (1,135 ) — Non-compete agreements 1.5-3 600 (125 ) 475 Total intangible assets $ 130,086 $ (17,435 ) $ 112,651 December 31, 2020 Estimated Useful Lives (Years) Gross Carrying Amount Accumulated Amortization Net Customer, affiliate and advertiser relationships 5-19 $ 78,283 $ (6,595 ) $ 71,688 Developed websites, technology and patents 10 32,535 (1,315 ) 31,220 Trademark, trade name and domain name 5-16 7,619 (1,831 ) 5,788 Proprietary user information database and internet traffic 5 1,149 (1,149 ) — Non-compete agreements 1.5-3 230 (54 ) 176 Total intangible assets $ 119,816 $ (10,944 ) $ 108,872 Intangible assets are amortized over their estimated useful lives, which range from eighteen months to nineteen 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 seven years. Amortization expense was $6.7 million and $0.3 million for the nine months ended September 30, 2021 and 2020, respectively. Amortization expense relating to developed websites, technology and patents is recorded within costs of revenues. All other amortization is recorded within operating expenses as the remaining intangible assets consist of customer-related assets which generate website traffic that the Company considers to be in support of selling and marketing activities. The Company did not write off any fully amortized intangible assets in the first nine months of 2021. The Company expects amortization expense of intangible assets to be as follows: Years Ending December 31: Amortization Expense 2021 (October 1 – December 31) $ 2,440 2022 9,297 2023 9,130 2024 9,099 2025 9,060 Thereafter 73,625 Total $ 112,651

Net Income Per Common Share

Net Income Per Common Share	9 Months Ended
	Sep. 30, 2021
Earnings Per Share [Abstract]
Net Income Per Common Share	7. Net Income Per Common Share A reconciliation of the numerator and denominator used in the calculation of basic and diluted net income per common share is as follows: For the Three Months Ended For the Nine Months Ended September 30, September 30, 2021 2020 2021 2020 Numerator: Net income $ 9,984 $ 6,782 $ 16,914 $ 13,762 Denominator: Basic: Weighted average shares of common stock and vested, undelivered restricted stock units outstanding 28,472,510 27,781,080 28,255,113 27,772,509 Diluted: Weighted average shares of common stock and vested, undelivered restricted stock units outstanding 28,472,510 27,781,080 28,255,113 27,772,509 Effect of potentially dilutive shares (1) 3,794,258 691,519 3,915,150 639,416 Total weighted average shares of common stock and vested, undelivered restricted stock units outstanding and potentially dilutive shares 32,266,768 28,472,599 32,170,263 28,411,925 Net Income Per Common Share: Basic: Net income applicable to common stockholders $ 9,984 $ 6,782 $ 16,914 $ 13,762 Weighted average shares of stock outstanding 28,472,510 27,781,080 28,255,113 27,772,509 Basic net income per common share $ 0.35 $ 0.24 $ 0.60 $ 0.50 Diluted: Net income applicable to common stockholders $ 10,375 $ 6,782 $ 18,085 $ 13,762 Weighted average shares of stock outstanding 32,266,768 28,472,599 32,170,263 28,411,925 Diluted net income per common share (1) $ 0.32 $ 0.24 $ 0.56 $ 0.48 (1) 20

Convertible Debt, Loan Agreemen

Convertible Debt, Loan Agreement and Subsequent Event	9 Months Ended
	Sep. 30, 2021
Debt Disclosure [Abstract]
Convertible Debt, Loan Agreement and Subsequent Event	8. Convertible Debt, Loan Agreement and Subsequent Event Convertible Debt In December 2020, the Company issued $201.3 million in aggregate principal amount of 0.125% convertible senior notes (the “Notes”) due December 15, 2025, unless earlier repurchased by the Company or converted by the holder pursuant to their terms. Interest is payable semiannually in arrears on June 15 and December 15 of each year, which commenced on June 15, 2021. The Notes are governed by an indenture between the Company, as issuer, and U.S. Bank, National Association, as trustee (the “Indenture”). The Notes are unsecured and rank senior in right of payment to the Company’s future indebtedness that is expressly subordinated in right of payment to the Notes and equal in right of payment to the Company’s unsecured indebtedness that is not so subordinated. Upon conversion, the Company will pay or deliver, as the case may be, cash, shares of the Company’s common stock or a combination of cash and shares of common stock, at the Company’s election. The Notes have an initial conversion rate of 14.1977 shares of common stock per $1,000 principal amount of the Notes. This represents an initial effective conversion price of approximately $70.43 per share of common stock and 2,857,447 shares issuable upon conversion of the full aggregate principal amount of the Notes. Throughout the term of the Notes, the conversion rate may be adjusted upon the occurrence of certain events. As of September 30, 2021, no such adjustment has occurred. Holders of the Notes will not receive any cash payment representing accrued and unpaid interest, if any, upon conversion of a Note, except in limited circumstances. Accrued but unpaid interest will be deemed to be paid by cash, shares of the Company’s common stock or a combination of cash and shares of the Company’s common stock paid or delivered, as the case may be, to the holder upon conversion of the Notes. Prior to the close of business on September 15, 2025, the Notes will be convertible at the option of holders during certain periods, only upon satisfaction of certain conditions set forth below. On or after September 15, 2025, until the close of business on the second scheduled trading day immediately preceding the maturity date, holders may convert all or any portion of their Notes at the conversion price at any time regardless of whether the conditions set forth below have been met. Holders may convert all or a portion of their Notes prior to the close of business on September 14, 2025, in multiples of the $1,000 principal amount, only under the following circumstances: • during any calendar quarter commencing after the calendar quarter ending on March 31, 2021 (and only during such calendar quarter), if the last reported sales price of the common stock for at least 20 trading days (whether or not consecutive) during a period of 30 consecutive trading days ending on, and including, the last trading day of the immediately preceding calendar quarter is greater than or equal to 130% of the conversion price on each applicable trading day; • during the five business day period after any five consecutive trading day period, or the Notes measurement period, in which the “trading price” (as defined in the Indenture) per $1,000 principal amount of the Notes for each trading day of the Notes measurement period was less than 98% of the product of the last reported sale price of the Company’s common stock and the conversion rate on each such trading day; • if the Company calls any or all of the Notes for redemption, at any time prior to the close of business on September 14, 2025; or • upon the occurrence of specified corporate events as set forth in the Indenture. Prior to the adoption of ASU 2020-06, based on market data available for publicly traded, senior, unsecured corporate bonds issued by companies in the same industry and with similar maturities, the Company estimated the implied market interest rate of its Notes to be approximately 5%, assuming no conversion option. Assumptions used in the estimate represent what market participants would use in pricing the liability component of the Notes, including market interest rates, credit standing, and yield curves, all of which are defined as Level 2 observable inputs. The estimated implied interest rate was applied to the Notes, which resulted in a fair value of the liability component of $158.8 million upon issuance, calculated as the present value of future contractual payments based on the $201.3 million of aggregate principal amount. The excess of the principal amount of the liability component over its carrying amount, or the debt discount, is amortized to interest expense over the term of the Notes. The $42.5 million difference between the gross proceeds received from the issuance of the Notes of $201.3 million and the estimated fair value of the liability component represents the equity component of the Notes and was recorded in additional paid-in capital. The equity component is not remeasured as long as it continues to meet the conditions for equity classification. In accounting for the transaction costs related to the issuance of the Notes, the Company allocated the total amount incurred to the liability and equity components in proportion to the allocation of proceeds. Transaction costs attributable to the liability component, totaling $5.25 million, are being amortized to expense over the term of the Notes, and transaction costs attributable to the equity component, totaling $1.4 million, were included with the equity component in shareholders’ equity. Effective January 1, 2021, upon the adoption of ASU 2020-06, the Company reclassified the equity component into the debt component as more fully described above. The Notes consist of the following: September 30, 2021 December 31, 2020 Liability Component: Principal $ 201,250 $ 201,250 Less: debt discount, net of amortization 5,619 47,368 Net carrying amount $ 195,631 $ 153,882 Equity component (a) $ — $ 41,059 (a) Recorded in the condensed consolidated balance sheet within additional paid-in capital, net of $1,404 transaction costs. The following table sets forth total interest expense recognized related to the Notes: September 30, 2021 December 31, 2020 0.125% coupon $ 189 $ 10 Amortization of debt discount and transaction costs 982 346 $ 1,171 $ 356 As of September 30, 2021, the fair value of the Notes, which was determined based on inputs that are observable in the market or that could be derived from, or corroborated with, observable market data, quoted prices of the Notes in an over-the-counter market (Level 2), and carrying value of debt instruments (carrying value excludes the equity component of the Company’s convertible notes classified in equity) were as follows: September 30, 2021 December 31, 2020 Fair Value Carrying Value Fair Value Carrying Value Convertible senior notes $ 266,532 $ 195,631 $ 218,940 $ 153,882 Based on the closing price of our common stock of $82.42 on September 30, 2021, the if-converted value of the Notes was greater by $34.3 million than their aggregate principal amount. The effective interest rate of the Notes is 0.8%. 2018 Loan Agreement On December 24, 2018, the Company entered into a Loan and Security Agreement (the “Loan Agreement”) with Western Alliance Bank (the “Bank”) as the lender. The Loan Agreement provided for a $25 million term loan facility with a maturity date of December 10, 2023. The Loan Agreement was paid in full in December 2020 and all liens related to the Loan Agreement released. Borrowings under the Loan Agreement bore interest, on the outstanding daily balance thereof, at a floating per annum rate equal to one and three-eighths percent (1.375%) above the greater of (a) the one (1) month U.S. London Interbank Offered Rate (“LIBOR”) rate reported in The Wall Street Journal as of such date or (b) two percent (2.00%). 2021 Loan Agreement On October 29, 2021, the Company entered into a Loan and Security Agreement with Western Alliance Bank, as administrative agent and collateral agent for the lenders, and the banks and other financial institutions or entities from time to time party thereto as lenders (the “2021 Loan Agreement”). The 2021 Loan Agreement provides for a $75 million revolving credit facility with a $5 million letter-of-credit sublimit and a maturity date of October 29, 2023. The 2021 Loan Agreement is secured by substantially all of the Company’s assets. Borrowings under the 2021 Loan Agreement bear interest at a rate equal to one (1) month U.S. LIBOR, plus a spread based upon the Company’s leverage (as defined by 2021 Loan Agreement), which may vary between 2.00% and 2.75%. The 2021 Loan Agreement is subject to various leverage and non-financial covenants. No amounts were outstanding under the 2021 Loan Agreement as of the date of this filing.

Leases and Contingencies

Leases and Contingencies	9 Months Ended
	Sep. 30, 2021
Lessee Disclosure [Abstract]
Leases and Contingencies	9. Leases and Contingencies 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 entered into a Third Amendment (the “Third Amendment”) to the lease agreement for office space in Newton, Massachusetts, dated as of August 4, 2009 (the “Newton Lease”). The Third Amendment extended the lease term to December 31, 2029 and preserves the Company’s option to extend the term for an additional five-year In April 2021, the Company entered into a Fourth Amendment (the “Fourth Amendment”). The Fourth Amendment became effective during May 2021. The Fourth Amendment reduced the rentable space from approximately 74,000 square feet to approximately 68,000 square feet and provided the Company with a one-time payment of approximately $0.6 million. As of May 1, 2021, base monthly rent is approximately $0.3 million per month. All other terms and conditions are substantially similar to those terms in the Third Amendment. Certain of the Company’s operating leases, including the Newton Lease, include lease incentives and escalating payment amounts and are renewable for varying periods. The Company recognizes 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. The Company has various non-cancelable lease agreements for certain of its offices with original lease periods expiring between 2021 and 2029. The Company’s lease terms may include options to extend or terminate the lease when it is reasonably certain it will exercise that option. Leases with renewal options allow the Company to extend the lease term typically between 1 and 5 years. When determining the lease term, renewal options reasonably certain of being exercised are included in the lease term. When determining if a renewal option is reasonably certain of being exercised, the Company considers several economic factors, including but not limited to, the significance of leasehold improvements incurred on the property, whether the asset is difficult to replace, underlying contractual obligations, or specific characteristics unique to that particular lease that would make it reasonably certain that the Company would exercise such option. Renewal and termination options were generally not included in the lease term for the Company's existing operating leases. Certain of the arrangements have discounted rent periods or escalating rent payment provisions. Leases with an initial term of twelve months or less are not recorded on the condensed consolidated balance sheets. The Company recognizes rent expense on a straight-line basis over the lease term. As of September 30, 2021, operating lease assets were $21.6 million and operating lease liabilities were $26.4 million. The maturities of the Company’s operating lease liabilities as of September 30, 2021 were as follows: Minimum Lease Years Ending December 31: Payments 2021 (October 1 – December 31) $ 876 2022 4,454 2023 4,033 2024 3,986 2025 3,197 Thereafter 13,195 Total future minimum lease payments 29,741 Less imputed interest 3,389 Total operating lease liabilities $ 26,352 Included in the Consolidated Balance Sheet: Current operating lease liabilities $ 3,675 Non-current operating lease liabilities 22,677 Total operating lease liabilities $ 26,352 For the three and nine months ended September 30, 2021 and 2020, the total lease cost was comprised of the following amounts: Three Months Ended September 30, Nine Months Ended September 30, 2021 2020 2021 2020 Operating lease expense $ 1,109 $ 988 $ 3,362 $ 2,881 Short-term lease expense 37 13 179 67 Total lease expense $ 1,146 $ 1,001 $ 3,541 $ 2,948 The following summarizes additional information related to operating leases: As of September 30, 2021 Weighted-average remaining lease term — operating leases 4.4 Weighted-average discount rate — operating leases 4 % If the rate implicit in the lease is not readily determinable, the Company uses its incremental borrowing rate as the discount rate. The Company uses its best judgment when determining the incremental borrowing rate, which is the rate of interest that the Company would have to pay to borrow on a collateralized basis over a similar term to the lease payments in a similar currency. Litigation From time to time and in the ordinary course of business, the Company may be subject to various claims, charges, and litigation. At September 30, 2021 and December 31, 2020, the Company did not have any pending claims, charges, or litigation that it expects would have a material adverse effect on its condensed consolidated financial position, results of operations, or cash flows .

Stock-Based Compensation

Stock-Based Compensation	9 Months Ended
	Sep. 30, 2021
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Stock-Based Compensation	1 0. Stock-Based Compensation Stock Option and Incentive Plans In April 2007, the Company’s board of directors 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. The 2007 Plan allowed the Company to grant incentive stock options (“ISOs”), non-qualified stock options (“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 vested over a three- to four-year 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. The 2007 Plan expired in May 2017. 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 shares of common stock that remain subject to outstanding stock grants under the 2007 Plan as of September 30, 2021 . In March 2017, the Company’s board of directors 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 June 16, 2017, 3,000,000 shares of the Company’s 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. In April 2021, the stockholders of the Company authorized the issuance of an additional 3,800,000 shares of the Company’s common stock under the 2017 Plan. 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 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 expected volatility of options granted has been determined using a weighted average of the historical volatility of the Company’s common 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 plans for the nine months ended September 30, 2021 is presented below: Nine Month Activity Options Outstanding Weighted- Average Exercise Price Per Share Weighted- Average Remaining Contractual Term in Years Aggregate Intrinsic Value Options outstanding at December 31, 2020 107,500 $ 17.34 — — Granted 20,000 66.93 — — Exercised (2,500 ) 6.47 — $ 154 Forfeited — — — — Cancelled — — — — Options outstanding at September 30, 2021 125,000 $ 25.49 6.60 $ 7,116 Options exercisable at September 30, 2021 105,000 $ 17.60 6.01 $ 6,806 Options vested or expected to vest at September 30, 2021 123,398 $ 25.11 6.57 $ 7,098 The total intrinsic value of options exercised (i.e. the difference between the market price at exercise and the price paid by the employee to exercise the options) was $154 thousand during the nine months ended September 30, 2021. The total amount of cash received from exercise of these options was approximately $16 thousand during the nine months ended September 30, 2021. The total intrinsic value of options exercised was $1.0 million during the nine months ended September 30, 2020. The total amount of cash received from exercise of these options was approximately $0.5 million during the nine months ended September 30, 2020. Restricted Stock Units Restricted stock units 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 activity under the Company’s plans for the nine months ended September 30, 2021 is presented below: Year-to-Date Activity Shares Weighted- Average Grant Date Fair Value Per Share Aggregate Intrinsic Value Nonvested outstanding at December 31, 2020 1,478,000 $ 31.33 — Granted 825,920 $ 73.46 — Vested (695,445 ) $ 31.05 — Forfeited (13,000 ) $ 52.20 — Nonvested outstanding at September 30, 2021 1,595,475 $ 53.11 $ 131,499 There were 695,445 restricted stock units with a total grant-date fair value of $21.6 million that vested during the nine months ended September 30, 2021. There were 709,842 restricted stock units with a total grant-date fair value of $14.2 million that vested during the nine months ended September 30, 2020. As of September 30, 2021, there was $77.8 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 2.1

Stockholders' Equity

Stockholders' Equity	9 Months Ended
	Sep. 30, 2021
Equity [Abstract]
Stockholders' Equity	11. Stockholders’ Equity Common Stock Repurchase Programs On November 7, 2018, the Company announced a stock repurchase program (the “November 2018 Stock Repurchase Program”) whereby the Company was authorized to repurchase up to an aggregate amount of $25.0 million of the Company’s common stock from time to time on the open market or in privately negotiated transactions at prices and in a manner that may be determined by management. The Company repurchased 736,760, 411,849 and 243,425 shares at an aggregate purchase price of $14.8 million, $7.1 million and $3.1 million and an average share price of $20.10, $17.14 and $12.82 during the years ended December 31, 2020, 2019, and 2018, respectively, under the November 2018 Stock Repurchase Program. We terminated the November 2018 Stock Repurchase Program in May 2020. In May 2020, the Company announced that the board of directors had authorized a new stock repurchase program (the “May 2020 Repurchase Program”) whereby we are authorized to repurchase an additional $25.0 million of 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 management. No amounts were repurchased under this plan during the nine month period ended September 30, 2021. Repurchased shares are recorded under the cost method and are reflected as treasury stock in the accompanying Condensed Consolidated Balance Sheets. Reserved Common Stock As of September 30, 2021, the Company has reserved 4,878,068 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 2007 Plan and 2017 Plan and 4,000,186 shares issuable upon conversion of the Notes.

Income Taxes (Benefit)

Income Taxes (Benefit)	9 Months Ended
	Sep. 30, 2021
Income Tax Disclosure [Abstract]
Income Taxes (Benefit)	12. Income Taxes (Benefit) The Company measures its interim period tax expense using an estimated annual effective tax rate and adjustments for discrete taxable events that occur during the interim period. The estimated annual effective income tax rate is based upon the Company’s estimations of annual pre-tax income, the geographic mix of pre-tax income, and its interpretations of tax laws. The Company updates the estimate of its annual effective tax rate at the end of each quarterly period. The Company recorded income tax expense (benefit) of $(3.1) million and $4.0 million for the three and nine months ended September 30, 2021 respectively. The tax expense for the nine months ended September 30, 2021 was reduced by approximately $5.4 million excess tax benefits of stock-based compensation, and increased by approximately $3.2 million due to an increase in the corporate tax rate in the United Kingdom from 19% to 25% which became law in June of 2021 with an effective date of April 1, 2023. This change impacted the value of the Company’s deferred tax assets and liabilities in the United Kingdom. The Company recorded income tax expense (benefit) of $(0.2) million and $2.8 million for the three and nine months ended September 30, 2020 respectively.

Segment Information

Segment Information	9 Months Ended
	Sep. 30, 2021
Segment Reporting [Abstract]
Segment Information	13. Segment Information The Company views its operations and manages its business as one operating segment which is the business of providing purchase intent marketing and sales services. The Company aggregated its operating segment based upon the similar economic and operating characteristics of its operations. Geographic Data Net sales by campaign target area were as follows (1): For the Three Months Ended September 30, For the Nine Months Ended September 30, 2021 2020 2021 2020 North America $ 41,852 $ 21,663 $ 114,306 $ 62,518 International 27,899 14,581 72,125 39,938 Total $ 69,751 $ 36,244 $ 186,431 $ 102,456 (1) Net sales to unaffiliated customers by geographic area were as follows (2): For the Three Months Ended September 30, For the Nine Months Ended September 30, 2021 2020 2021 2020 United States $ 49,440 $ 24,970 $ 132,709 $ 71,604 United Kingdom 9,453 4,433 26,426 12,756 Other international 10,858 6,841 27,296 18,096 Total $ 69,751 $ 36,244 $ 186,431 $ 102,456 (2) Long-lived assets by geographic area were as follows: September 30, 2021 December 31, 2020 United States $ 224,831 $ 195,424 International 102,395 106,227 Total $ 327,226 $ 301,651 Long-lived assets are comprised of property and equipment, net; goodwill; and intangible assets, net.

Acquisitions

Acquisitions	9 Months Ended
	Sep. 30, 2021
Business Combinations [Abstract]
Acquisitions	14. Acquisitions 2021 Acquisition During July 2021, the Company acquired substantially all the assets of Xtelligent Healthcare Media, LLC, a leading healthcare business to business media company focusing on healthcare-related technology for consideration of $24.3 million in cash after deducting $0.7million for negative working capital and contingent consideration valued at $2.5 million. The earnouts are subject to certain revenue growth targets and the payment is adjusted based on actual results with a maximum payment of $5 million dollars. The transaction was not material to the Company and the costs associated with the acquisition were not material. The Company accounted for the transaction as a business combination. In allocating the purchase consideration based on estimated fair values, the Company recorded $11.4 million of intangible assets and $16.1 million of goodwill. The majority of the goodwill balance associated with this business combination is deductible for U.S. income tax purposes. 2020 Acquisitions BrightTALK Limited On December 23, 2020, the Company acquired all outstanding stock of BrightTALK Limited and its wholly owned subsidiary BrightTALK, Inc., which is a leading marketing platform for webinars and virtual events that enables marketers to create original webinar and video content. The Company has included the financial results of BrightTALK in the condensed consolidated financial statements from the date of acquisition. The transaction costs associated with the acquisition were approximately $5.0 million and were recorded in general and administrative expense. The acquisition date fair value of the consideration transferred for BrightTALK was approximately $151.0 million in cash. Our condensed consolidated financial statements have not been retroactively restated to include BrightTALK’s historical financial position or results of operations. The acquisition was accounted for as a business combination. In accordance with the purchase method of accounting, the purchase price paid has been allocated to the assets and liabilities acquired based upon their estimated fair values as of the acquisition date, with the excess of the purchase price over the net assets acquired recorded as goodwill. We have substantially completed our valuation processes of all of the assets and liabilities acquired in the acquisition, however, until we have completed our valuation process, there may be adjustments to our estimates of fair value and resulting preliminary purchase price allocation, specifically those that require significant accounting estimates and assumptions. The following table shows the preliminary purchase price allocation as of the date acquired, and adjustments to September 30, 2021 (in thousands): December 23, 2020 Adjustments(1) September 30, 2021 Cash $ 1,997 $ — $ 1,997 Accounts receivable 11,810 — 11,810 Operating lease right-of-use assets 1,986 — 1,986 Other assets 2,948 (332 ) 2,616 Goodwill 71,846 2,560 74,406 Intangible assets 90,370 — 90,370 Accounts payable, accrued expenses and other liabilities (9,194 ) (2,091 ) (11,285 ) Unearned revenue (6,980 ) — (6,980 ) Operating lease liabilities (2,446 ) — (2,446 ) Deferred tax liabilities and income tax payable (11,490 ) (137 ) (11,627 ) Net Assets acquired $ 150,847 $ — $ 150,847 (1) Excludes currency translation adjustments related to assets and liabilities of BrightTALK Limited since the purchase date. The excess of purchase consideration over the fair value of net tangible and identifiable intangible assets acquired was recorded as goodwill, which is primarily attributed to the assembled workforce and expanded market opportunities, for which there is no basis for U.S. income tax purposes. The fair values assigned to tangible assets acquired and liabilities assumed are based on management’s estimates and assumptions. The provisional measurements of fair value for income taxes payable and deferred taxes set forth above may be subject to change as additional information is received and certain tax returns are finalized. Certain tax attributes that will benefit the Company, for which the calculations are not yet complete, are payable to the seller upon the Company’s realization of those benefits. Estimated fair value measurements relating to the acquisition are made using Level 3 inputs including discounted cash flow techniques. Fair value is estimated using inputs primarily from the income approach, which include the use of both the multiple period excess earnings method and the relief from royalties method. The significant assumptions used in estimating fair value include (i) the estimated life the asset will contribute to cash flows, such as attrition rate of customers or remaining contractual terms, (ii) profitability and (iii) the estimated discount rate that reflect the level of risk associated with receiving future cash flows. The Company valued the customer relationship asset using an income approach; specifically, the multi-period excess earnings method. The significant assumptions used to value customer relationships included, among others, attrition rates, revenue growth rate, and discount rate. The Company expects to finalize the valuation as soon as practicable, but not later than one year from the acquisition date . Other Acquisitions During 2020, the Company acquired substantially all the assets of two other companies for an aggregate of $25.0 million in cash and $2.2 million of contingent consideration and has included the financial results of these companies in its condensed consolidated financial statements from the dates of acquisition. The earnouts are subject to certain revenue growth targets and the payment is adjusted based on actual results. The transactions were not material to the Company and the costs associated with the acquisitions were not material. The Company accounted for the transactions as business combinations. In allocating the purchase consideration based on estimated fair values, the Company recorded $17.1 million of intangible assets (offset by the value of assumed liabilities under of the agreements of $3.5 million), and $12.7 million of goodwill. The majority of the goodwill balance associated with these business combinations is deductible for U.S. income tax purposes.

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	9 Months Ended
	Sep. 30, 2021
Accounting Policies [Abstract]
Principles of Consolidation	Principles of Consolidation The accompanying Condensed 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 (Australia) Pty Ltd., TechTarget (Singapore) Pte Ltd., E-Magine Médias SAS (“LeMagIT”), TechTarget Germany GmbH and as of December 23, 2020, BrightTALK Limited and its wholly owned subsidiary, BrightTALK, Inc. (collectively, the “BrightTALK subsidiaries”). 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. 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. The BrightTALK subsidiaries are entities through which the Company does business for the BrightTALK webinar and virtual event and audience delivery platform.
Basis of Presentation	Basis of Presentation The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted (Generally Accepted Accounting Principles or “U.S. GAAP”) in the United States (“U.S.”) for interim financial information and with the instructions to Form 10-Q and Rule 10-01 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by U.S. GAAP for complete financial statements. All adjustments, which, in the opinion of management, are considered necessary for a fair presentation of the results of operations for the periods shown, are of a normal, recurring nature and have been reflected in the condensed consolidated financial statements. The results of operations for the periods presented are not necessarily indicative of results to be expected for any other interim periods or for the full year. The information included in these condensed consolidated financial statements should be read in conjunction with “Management’s Discussion and Analysis of Financial Condition and Results of Operations” contained in this report and the condensed consolidated financial statements and accompanying notes included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2020.
Reclassifications	Reclassifications The Company historically presented depreciation and amortization expense as one combined line item on the Condensed Consolidated Statements of Income and Comprehensive Income. Due to the Company’s recent acquisitions, the materiality of amortization expense has increased and the Company has elected to present these expenses in two separate line items for all periods presented. This reclassification had no effect on total operating expenses or net income.
Foreign Currency Translation	Foreign Currency The functional currency of the Company’s major foreign subsidiaries is generally the local currency. Adjustments resulting from translating foreign functional currency financial statements into U.S. dollars are recorded as a separate component on the Condensed Consolidated Statement of Comprehensive Income. Foreign currency transaction gains and losses are included in interest and other income (expense), net in the Condensed Consolidated Statement of Income. All assets and liabilities denominated in foreign currency are translated into U.S. dollars at the exchange rate on the balance sheet date. Revenue and expenses are translated at the average exchange rate during the period.
Use of Estimates	Use of Estimates The preparation of condensed consolidated financial statements in conformity with U.S. 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 condensed consolidated financial statements and the reported amounts of revenue and expenses during the reporting period. On an ongoing basis, the Company evaluates its estimates, including those related to revenue, long-lived assets, goodwill, the allowance for doubtful accounts, stock-based compensation, self-insurance accruals, and income taxes. The Company reduces its accounts receivable for an allowance for doubtful accounts based on its best estimate of the amount of probable credit losses. 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 its revenue from the sale of purchase intent data and marketing and sales services, which it delivers via its network of websites, webinar and virtual event channels, and data analytics solutions. Revenue is recognized when performance obligations are satisfied by transferring promised goods or services to customers, as determined by applying a five-step process consisting of: a) identifying the contract, or contracts, with a customer, b) identifying the performance obligations in the contract, c) determining the transaction price, d) allocating the transaction price to the performance obligations in the contract, and e) recognizing revenue when, or as, performance obligations are satisfied.
Accounts Receivable	Accounts Receivable We maintain an allowance for credit losses for expected uncollectible accounts receivable, which is recorded as an offset to accounts receivable and changes in such are classified as general and administrative expense in the Condensed Consolidated Statements of Income and Comprehensive Income. We assess collectability by reviewing accounts receivable on an individual basis when we identify specific customers with known disputes, overdue amounts or collectability issues and also reserve for losses on all accounts based on historical information, current market conditions and reasonable and supportable forecasts of future economic conditions to inform adjustments to historical loss data. In determining the amount of the allowance for credit losses, we consider historical collectability based on past due status and make judgments about the creditworthiness of customers based on ongoing credit evaluations. At September 30, 2021, the Company’s collectability assessment continues to include the business and market disruptions caused by COVID-19 and estimates of expected emerging credit and collectability trends. The continued volatility in market conditions and evolving shifts in credit trends are difficult to predict, causing variability and volatility that may have a material impact on our allowance for credit losses in future periods.
Fair Value of Financial Instruments	Fair Value of Financial Instruments Financial instruments consist of cash and cash equivalents, short-term investments, accounts receivable, accounts payable, and contingent consideration. Due to their short-term nature and liquidity, the carrying value of these instruments, with the exception of contingent consideration, approximates their estimated fair values. The Company classifies all of its short-term investments as available-for-sale. The fair value of contingent consideration was estimated using a discounted cash flow method.
Business Combinations	Business Combinations The Company uses its best estimates and assumptions to assign fair value to the tangible and intangible assets acquired and During the measurement period, which may be up to one year from the acquisition date, the Company may record adjustments to the fair value of these tangible and intangible assets acquired and liabilities assumed, with the corresponding offset to goodwill. In addition, uncertain tax positions and tax-related valuation allowances are initially recorded in connection with a business combination as of the acquisition date. The Company continues to collect information and reevaluates these estimates and assumptions quarterly and records any adjustments to the Company’s preliminary estimates to goodwill provided that the Company is within the measurement period. Upon the conclusion of the measurement period or final determination of the fair value of assets acquired or liabilities assumed, whichever comes first, any subsequent adjustments are recorded to the Company’s Condensed Consolidated Statement of Income and Comprehensive Income.
Other Liabilities	Other Liabilities Other liabilities consist of the long-term portions of amounts payable related to our acquisition of substantially all of the assets of Xtelligent Healthcare Media, LLC and the amounts deferred under the Coronavirus Aid, Relief and Economic Security Act (the “CARES Act”) which allows employers to defer the payment of the Company’s employer share of FICA payroll taxes. The amount of the employer share of FICA payroll taxes (6.2% of the first $137,700 of employee pay) due for the period beginning on March 27, 2020, and ending December 31, 2020, were deferred. The deferred amounts are payable in equal installments at December 31, 2021 and December 31, 2022. Amounts relating to the payment due December 31, 2021 of $1.2 million are included in accrued expenses as of September 30, 2021.
Recent Accounting Pronouncements	Recent Accounting Pronouncements Recently Adopted Accounting Guidance In January 2017, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“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. We adopted the new standard effective January 1, 2020 and the guidance did not have a material impact on our condensed consolidated financial statements. In August 2018, the FASB issued ASU No. 2018-15, Intangibles-Goodwill and Other-Internal-Use Software (Subtopic 350-40): Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement that is a Service Contract (ASU 2018-15), which requires implementation costs incurred by customers in cloud computing arrangements (i.e. hosting arrangements) to be capitalized under the same premises of authoritative guidance for internal-use software, and deferred over the non-cancellable term of the cloud computing arrangements plus any optional renewal periods that are reasonably certain to be exercised by the customer or for which the exercise is controlled by the service provider. ASU 2018-15 is effective for fiscal years beginning after December 15, 2019, and interim periods within those fiscal years, with early adoption permitted. We adopted the new standard effective January 1, 2020 and the guidance did not have a material impact on our condensed consolidated financial statements. In June 2016, the FASB issued ASU No. 2016-03, “Measurement of Credit Losses on Financial Instruments,” (ASU 2016-03) which amends ASC 326 “Financial Instruments—Credit Losses” which introduces a new methodology for accounting for credit losses on financial instruments. The guidance establishes a new forward-looking "expected loss model" that requires entities to estimate current expected credit losses on accounts receivable and financial instruments by using all practical and relevant information. We adopted the new standard effective January 1, 2020 and the guidance did not have a material impact on our condensed consolidated financial statements. In August 2018, the FASB issued ASU No. 2018-13, “Changes to Disclosure Requirements for Fair Value Measurements” (Topic 820) (ASU 2018-13), which improved the effectiveness of disclosure requirements for recurring and nonrecurring fair value measurements. The standard removes, modifies, and adds certain disclosure requirements. We adopted the new standard effective January 1, 2020 and the guidance did not have a material impact on our condensed consolidated financial statements. In December 2019, the FASB issued ASU No. 2019-12 (ASU 2019-12), Simplifying the Accounting for Income Taxes (Topic 740). ASU 2019-12 removes certain exceptions for performing intraperiod tax allocations, recognizing deferred taxes for investments, and calculating income taxes in interim periods. The guidance also simplifies the accounting for franchise taxes, transactions that result in a step-up in the tax basis of goodwill, and the effect of enacted changes in tax laws or rates in interim periods. The Company adopted ASU 2019-12 effective January 1, 2021 and the guidance did not In August 2020, the FASB issued No. ASU 2020-06, Debt – Debt with Conversion and Other Options (Subtopic 470-20) and Derivatives and Hedging – Contracts in Entity’s own Equity (Subtopic 815-40), which simplifies the accounting for certain financial instruments with characteristics of liabilities and equity, including convertible debt instruments and contracts on an entity’s own equity. Among other things, the standard removes certain accounting models which require bifurcation from the host contract of certain features of convertible debt instruments, unless the feature qualifies as a derivative under ASC 815. Additionally, companies are required to use the if-converted method for convertible instruments in their calculations of diluted earnings per share. Early adoption is permitted but no earlier than the fiscal year beginning after December 15, 2020. The Company elected to early adopt ASU 2020-06 effective January 1, 2021. The Company has elected the modified retrospective method to transition to the guidance. The modified retrospective method requires the Company to 1) Recombine our convertible notes into a single instrument by reclassifying the amount initially recorded to the equity component against the outstanding debt on the convertible notes. 2) Reclassify an amount from retained earnings equal to the difference between the sum of the carrying values of the debt and the conversion feature immediately before transition and the revised amortized cost of the combined convertible instrument under the traditional debt model as of the transition date. 3) Post-transition, account for the convertible notes as a single instrument recognizing interest expense based on the applicable and recalculated effective interest rate and continue to apply the if-converted method in the Company’s calculation of diluted earnings per share. The following table summarizes the impact of the adoption of ASU 2020-06 on the Company’s condensed consolidated financial statements: December 31, 2020 January 1, 2021 Change Convertible Debt $ 153,882 $ 194,649 $ 40,767 Additional Paid-in Capital 363,055 332,555 (30,500 ) Retained Earnings 37,580 37,813 233 Deferred Tax Liabilities 23,848 13,348 (10,500 ) Total $ —

Summary of Significant Accoun_3

Summary of Significant Accounting Policies (Tables)	9 Months Ended
	Sep. 30, 2021
Accounting Policies [Abstract]
Summary of Impact of Accounting Standard Adoption	The following table summarizes the impact of the adoption of ASU 2020-06 on the Company’s condensed consolidated financial statements: December 31, 2020 January 1, 2021 Change Convertible Debt $ 153,882 $ 194,649 $ 40,767 Additional Paid-in Capital 363,055 332,555 (30,500 ) Retained Earnings 37,580 37,813 233 Deferred Tax Liabilities 23,848 13,348 (10,500 ) Total $ —

Revenue (Tables)

Revenue (Tables)	9 Months Ended
	Sep. 30, 2021
Revenue Recognition [Abstract]
Disaggregated Revenue	The following table depicts the disaggregation of revenue according to categories consistent with how the Company evaluates its financial performance and economic risk. International revenue consists of international geo-targeted campaigns, which are campaigns targeted at an audience of members outside of North America. For the Three Months Ended September 30, For the Nine Months Ended September 30, 2021 2020 2021 2020 North America $ 41,852 $ 21,663 $ 114,306 $ 62,518 International 27,899 14,581 72,125 39,938 Total $ 69,751 $ 36,244 $ 186,431 $ 102,456
Schedule of Deferred Revenue Included in Contract Liabilities	Contract Liabilities Year-to-Date Activity Balance at December 31, 2020 $ 15,689 Billings 62,341 Revenue Recognized (52,969 ) Balance at March 31, 2021 $ 25,061 Billings 66,504 Revenue Recognized (63,711 ) Balance at June 30, 2021 $ 27,854 Billings 71,586 Revenue Recognized (69,751 ) Balance at September 30, 2021 $ 29,689

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	9 Months Ended
	Sep. 30, 2021
Fair Value Disclosures [Abstract]
Assets Carried at Fair Value and Measured on Recurring Basis	The fair value hierarchy of the Company’s financial assets carried at fair value and measured on a recurring basis is as follows: Fair Value Measurements at September 30, 2021 September 30, 2021 Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Assets: Short-term investments (1) $ 5,085 $ — $ 5,085 $ — Total assets $ 5,085 $ — $ 5,085 $ — Liabilities: Contingent consideration - current (2) $ 3,116 $ — $ — $ 3,116 Contingent consideration - non-current (2) $ 1,954 $ — $ — $ 1,954 Total liabilities $ 5,070 $ — $ — $ 5,070 Fair Value Measurements at December 31, 2020 December 31, 2020 Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Assets: Short-term investments (1) $ 84 $ — $ 84 $ — Total assets $ 84 $ — $ 84 $ — Liabilities: Contingent consideration - current (2) $ 1,027 $ — $ — $ 1,027 Contingent consideration - non-current (2) 1,751 — — 1,751 Total liabilities $ 2,778 $ — $ — $ 2,778 (1) (2) Contingent consideration liabilities are measured using the income approach and discounted to present value based on an assessment of the probability that the Company would be required to make such future payments. The contingent consideration liabilities are measured at fair value using significant L evel 3 (unobservable) inputs such as discount rates and probability measures. Remeasurement of the contingent consideration to fair value is reported in the income statement as amortization expense in the period remeasured . Amounts due within twelve months are included in accrued expenses a nd amounts due exceeding twelve months are included as other liabilities.
Fair Value of Contingent Consideration	Fair Value Year-to-Date Activity Balance at December 31, 2020 $ 2,778 Payments on Contingent Liabilities (1,032 ) Amortization of discount on contingent liabilities 53 Remeasurement of contingent liabilities 185 Balance at March 31, 2021 $ 1,984 Amortization of discount on contingent liabilities 44 Remeasurement of contingent liabilities 209 Balance at June 30, 2021 $ 2,237 Payments on Contingent Liabilities (27 ) Amortization of discount on contingent liabilities 31 Remeasurement of contingent liabilities 329 Liabilities resulting from acquisitions 2,500 Balance at September 30, 2021 $ 5,070

Cash and Investments (Tables)

Cash and Investments (Tables)	9 Months Ended
	Sep. 30, 2021
Cash And Cash Equivalents [Abstract]
Short-term Investments	Short-term investments consisted of the following: September 30, 2021 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Estimated Fair Value Short-term investments: Bond funds $ 5,084 $ 1 $ — $ 5,085 Total short-term investments $ 5,084 $ 1 $ — $ 5,085 December 31, 2020 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Estimated Fair Value Short-term investments: Bond funds $ 84 $ — $ — $ 84 Total short-term investments $ 84 $ — $ — $ 84

Goodwill and Intangible Assets

Goodwill and Intangible Assets (Tables)	9 Months Ended
	Sep. 30, 2021
Goodwill And Intangible Assets Disclosure [Abstract]
Summary of Intangible Assets	The following table summarizes the Company’s intangible assets, net: September 30, 2021 Estimated Useful Lives (Years) Gross Carrying Amount Accumulated Amortization Net Customer, affiliate and advertiser relationships 5-19 $ 85,572 $ (10,299 ) $ 75,273 Developed websites, technology and patents 10 34,877 (3,657 ) 31,220 Trademark, trade name and domain name 5-16 7,902 (2,219 ) 5,683 Proprietary user information database and internet traffic 5 1,135 (1,135 ) — Non-compete agreements 1.5-3 600 (125 ) 475 Total intangible assets $ 130,086 $ (17,435 ) $ 112,651 December 31, 2020 Estimated Useful Lives (Years) Gross Carrying Amount Accumulated Amortization Net Customer, affiliate and advertiser relationships 5-19 $ 78,283 $ (6,595 ) $ 71,688 Developed websites, technology and patents 10 32,535 (1,315 ) 31,220 Trademark, trade name and domain name 5-16 7,619 (1,831 ) 5,788 Proprietary user information database and internet traffic 5 1,149 (1,149 ) — Non-compete agreements 1.5-3 230 (54 ) 176 Total intangible assets $ 119,816 $ (10,944 ) $ 108,872
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 2021 (October 1 – December 31) $ 2,440 2022 9,297 2023 9,130 2024 9,099 2025 9,060 Thereafter 73,625 Total $ 112,651

Net Income Per Common Share (Ta

Net Income Per Common Share (Tables)	9 Months Ended
	Sep. 30, 2021
Earnings Per Share [Abstract]
Reconciliation of Numerator and Denominator Used in Calculation of Basic and Diluted Net Income Per Common Share	A reconciliation of the numerator and denominator used in the calculation of basic and diluted net income per common share is as follows: For the Three Months Ended For the Nine Months Ended September 30, September 30, 2021 2020 2021 2020 Numerator: Net income $ 9,984 $ 6,782 $ 16,914 $ 13,762 Denominator: Basic: Weighted average shares of common stock and vested, undelivered restricted stock units outstanding 28,472,510 27,781,080 28,255,113 27,772,509 Diluted: Weighted average shares of common stock and vested, undelivered restricted stock units outstanding 28,472,510 27,781,080 28,255,113 27,772,509 Effect of potentially dilutive shares (1) 3,794,258 691,519 3,915,150 639,416 Total weighted average shares of common stock and vested, undelivered restricted stock units outstanding and potentially dilutive shares 32,266,768 28,472,599 32,170,263 28,411,925 Net Income Per Common Share: Basic: Net income applicable to common stockholders $ 9,984 $ 6,782 $ 16,914 $ 13,762 Weighted average shares of stock outstanding 28,472,510 27,781,080 28,255,113 27,772,509 Basic net income per common share $ 0.35 $ 0.24 $ 0.60 $ 0.50 Diluted: Net income applicable to common stockholders $ 10,375 $ 6,782 $ 18,085 $ 13,762 Weighted average shares of stock outstanding 32,266,768 28,472,599 32,170,263 28,411,925 Diluted net income per common share (1) $ 0.32 $ 0.24 $ 0.56 $ 0.48 (1) 20

Convertible Debt, Loan Agreem_2

Convertible Debt, Loan Agreement and Subsequent Event (Tables)	9 Months Ended
	Sep. 30, 2021
Debt Disclosure [Abstract]
Schedule of Notes	The Notes consist of the following: September 30, 2021 December 31, 2020 Liability Component: Principal $ 201,250 $ 201,250 Less: debt discount, net of amortization 5,619 47,368 Net carrying amount $ 195,631 $ 153,882 Equity component (a) $ — $ 41,059 (a) Recorded in the condensed consolidated balance sheet within additional paid-in capital, net of $1,404 transaction costs.
Schedule Of Interest Expense Recognized	The following table sets forth total interest expense recognized related to the Notes: September 30, 2021 December 31, 2020 0.125% coupon $ 189 $ 10 Amortization of debt discount and transaction costs 982 346 $ 1,171 $ 356
Schedule of Fair Value and Carrying Value of Debt Instrument	As of September 30, 2021, the fair value of the Notes, which was determined based on inputs that are observable in the market or that could be derived from, or corroborated with, observable market data, quoted prices of the Notes in an over-the-counter market (Level 2), and carrying value of debt instruments (carrying value excludes the equity component of the Company’s convertible notes classified in equity) were as follows: September 30, 2021 December 31, 2020 Fair Value Carrying Value Fair Value Carrying Value Convertible senior notes $ 266,532 $ 195,631 $ 218,940 $ 153,882

Leases and Contingencies (Table

Leases and Contingencies (Tables)	9 Months Ended
	Sep. 30, 2021
Lessee Disclosure [Abstract]
Summary of Maturities of Operating Lease Liabilities	As of September 30, 2021, operating lease assets were $21.6 million and operating lease liabilities were $26.4 million. The maturities of the Company’s operating lease liabilities as of September 30, 2021 were as follows: Minimum Lease Years Ending December 31: Payments 2021 (October 1 – December 31) $ 876 2022 4,454 2023 4,033 2024 3,986 2025 3,197 Thereafter 13,195 Total future minimum lease payments 29,741 Less imputed interest 3,389 Total operating lease liabilities $ 26,352 Included in the Consolidated Balance Sheet: Current operating lease liabilities $ 3,675 Non-current operating lease liabilities 22,677 Total operating lease liabilities $ 26,352
Summary of Lease Costs	For the three and nine months ended September 30, 2021 and 2020, the total lease cost was comprised of the following amounts: Three Months Ended September 30, Nine Months Ended September 30, 2021 2020 2021 2020 Operating lease expense $ 1,109 $ 988 $ 3,362 $ 2,881 Short-term lease expense 37 13 179 67 Total lease expense $ 1,146 $ 1,001 $ 3,541 $ 2,948
Lessee Operating Lease Term and Discount Rate	The following summarizes additional information related to operating leases: As of September 30, 2021 Weighted-average remaining lease term — operating leases 4.4 Weighted-average discount rate — operating leases 4 %

Stock-Based Compensation (Table

Stock-Based Compensation (Tables)	9 Months Ended
	Sep. 30, 2021
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Summary of Stock Option Activity Under Company's Plans	A summary of the stock option activity under the Company’s plans for the nine months ended September 30, 2021 is presented below: Nine Month Activity Options Outstanding Weighted- Average Exercise Price Per Share Weighted- Average Remaining Contractual Term in Years Aggregate Intrinsic Value Options outstanding at December 31, 2020 107,500 $ 17.34 — — Granted 20,000 66.93 — — Exercised (2,500 ) 6.47 — $ 154 Forfeited — — — — Cancelled — — — — Options outstanding at September 30, 2021 125,000 $ 25.49 6.60 $ 7,116 Options exercisable at September 30, 2021 105,000 $ 17.60 6.01 $ 6,806 Options vested or expected to vest at September 30, 2021 123,398 $ 25.11 6.57 $ 7,098
Summary of Restricted Stock Unit Activity Under Company's Plans	Restricted stock units 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 activity under the Company’s plans for the nine months ended September 30, 2021 is presented below: Year-to-Date Activity Shares Weighted- Average Grant Date Fair Value Per Share Aggregate Intrinsic Value Nonvested outstanding at December 31, 2020 1,478,000 $ 31.33 — Granted 825,920 $ 73.46 — Vested (695,445 ) $ 31.05 — Forfeited (13,000 ) $ 52.20 — Nonvested outstanding at September 30, 2021 1,595,475 $ 53.11 $ 131,499

Segment Information (Tables)

Segment Information (Tables)	9 Months Ended
	Sep. 30, 2021
Long-Lived Assets by Geographic Area	Long-lived assets by geographic area were as follows: September 30, 2021 December 31, 2020 United States $ 224,831 $ 195,424 International 102,395 106,227 Total $ 327,226 $ 301,651
Customers by Campaign Target Area [Member]
Net Sales by Campaign Target Area and Geographic Area	Net sales by campaign target area were as follows (1): For the Three Months Ended September 30, For the Nine Months Ended September 30, 2021 2020 2021 2020 North America $ 41,852 $ 21,663 $ 114,306 $ 62,518 International 27,899 14,581 72,125 39,938 Total $ 69,751 $ 36,244 $ 186,431 $ 102,456 (1)
Unaffiliated Customers by Geographic Area [Member]
Net Sales by Campaign Target Area and Geographic Area	Net sales to unaffiliated customers by geographic area were as follows (2): For the Three Months Ended September 30, For the Nine Months Ended September 30, 2021 2020 2021 2020 United States $ 49,440 $ 24,970 $ 132,709 $ 71,604 United Kingdom 9,453 4,433 26,426 12,756 Other international 10,858 6,841 27,296 18,096 Total $ 69,751 $ 36,244 $ 186,431 $ 102,456 (2)

Acquisitions (Tables)

Acquisitions (Tables)	9 Months Ended
	Sep. 30, 2021
Business Combinations [Abstract]
Summary of Preliminary Purchase Price Allocation	The following table shows the preliminary purchase price allocation as of the date acquired, and adjustments to September 30, 2021 (in thousands): December 23, 2020 Adjustments(1) September 30, 2021 Cash $ 1,997 $ — $ 1,997 Accounts receivable 11,810 — 11,810 Operating lease right-of-use assets 1,986 — 1,986 Other assets 2,948 (332 ) 2,616 Goodwill 71,846 2,560 74,406 Intangible assets 90,370 — 90,370 Accounts payable, accrued expenses and other liabilities (9,194 ) (2,091 ) (11,285 ) Unearned revenue (6,980 ) — (6,980 ) Operating lease liabilities (2,446 ) — (2,446 ) Deferred tax liabilities and income tax payable (11,490 ) (137 ) (11,627 ) Net Assets acquired $ 150,847 $ — $ 150,847 (1) Excludes currency translation adjustments related to assets and liabilities of BrightTALK Limited since the purchase date.

Organization and Operations - A

Organization and Operations - Additional Information (Detail)	9 Months Ended
	Sep. 30, 2021WebsiteWebinar
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Number of websites | Website	150
Number of webinars/virtual event channels | Webinar	1,125

Summary of Significant Accoun_4

Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($)	9 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
ASU No. 2017-04 [Member]
Significant Accounting Policies [Line Items]
Change in Accounting Principle, Accounting Standards Update, Adopted [true false]	true
Change in Accounting Principle, Accounting Standards Update, Adoption Date	Jan. 1, 2020
Change in Accounting Principle, Accounting Standards Update, Immaterial Effect [true false]	true
ASU No. 2018-15 [Member]
Significant Accounting Policies [Line Items]
Change in Accounting Principle, Accounting Standards Update, Adopted [true false]	true
Change in Accounting Principle, Accounting Standards Update, Adoption Date	Jan. 1, 2020
Change in Accounting Principle, Accounting Standards Update, Immaterial Effect [true false]	true
ASU 2016-13 [Member]
Significant Accounting Policies [Line Items]
Change in Accounting Principle, Accounting Standards Update, Adopted [true false]	true
Change in Accounting Principle, Accounting Standards Update, Adoption Date	Jan. 1, 2020
Change in Accounting Principle, Accounting Standards Update, Immaterial Effect [true false]	true
ASU No. 2018-13 [Member]
Significant Accounting Policies [Line Items]
Change in Accounting Principle, Accounting Standards Update, Adopted [true false]	true
Change in Accounting Principle, Accounting Standards Update, Adoption Date	Jan. 1, 2020
Change in Accounting Principle, Accounting Standards Update, Immaterial Effect [true false]	true
ASU No. 2019-12 [Member]
Significant Accounting Policies [Line Items]
Change in Accounting Principle, Accounting Standards Update, Adopted [true false]	true
Change in Accounting Principle, Accounting Standards Update, Adoption Date	Jan. 1, 2021
Change in Accounting Principle, Accounting Standards Update, Immaterial Effect [true false]	true
ASU 2020-06
Significant Accounting Policies [Line Items]
Change in Accounting Principle, Accounting Standards Update, Adoption Date	Jan. 1, 2021
Change in Accounting Principle, Accounting Standards Update, Early Adoption [true false]	true
Coronavirus, Aid, Relief and Economic Security Act (CARES Act) [Member]
Significant Accounting Policies [Line Items]
Percentage of deferred employee share of FICA taxes		6.20%
Deferred payroll tax payment		$ 137,700
Coronavirus, Aid, Relief and Economic Security Act (CARES Act) [Member] | Accrued Expenses [Member]
Significant Accounting Policies [Line Items]
Deferred payroll tax payment	$ 1,200,000

Summary of Significant Accoun_5

Summary of Significant Accounting Policies - Summary of Impact of Accounting Standards Adoption (Detail) - USD ($) $ in Thousands	Sep. 30, 2021	Jan. 01, 2021	Dec. 31, 2020
Property Plant And Equipment [Line Items]
Convertible debt	$ 195,631	$ 194,649	$ 153,882
Additional paid-in capital	353,644	332,555	363,055
Retained earnings	54,727	37,813	37,580
Deferred tax liabilities	16,087	$ 13,348	$ 23,848
ASU 2020-06 | Change
Property Plant And Equipment [Line Items]
Convertible debt	40,767
Additional paid-in capital	(30,500)
Retained earnings	233
Deferred tax liabilities	$ (10,500)

Revenue - Disaggregated Revenue

Revenue - Disaggregated Revenue (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Disaggregation Of Revenue [Line Items]
Total Revenues	$ 69,751	$ 36,244	$ 186,431	$ 102,456
North America [Member]
Disaggregation Of Revenue [Line Items]
Total Revenues	41,852	21,663	114,306	62,518
International [Member]
Disaggregation Of Revenue [Line Items]
Total Revenues	$ 27,899	$ 14,581	$ 72,125	$ 39,938

Revenue - Additional Informatio

Revenue - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2021	Dec. 31, 2020
Deferred Revenue Arrangement [Line Items]
Contract with customer liability from deferred revenue	$ 14.8	$ 42.9
Minimum [Member]
Deferred Revenue Arrangement [Line Items]
Deferred revenue payment terms		30 days
Maximum [Member]
Deferred Revenue Arrangement [Line Items]
Deferred revenue payment terms		90 days
Revenue recognition timing of invoicing period		1 year
Amortization period of contract assets		1 year
Contract with customer contract period		1 year
Contract Liabilities [Member]
Deferred Revenue Arrangement [Line Items]
Accrued sales incentives	$ 2.1	$ 2.1	$ 2.2

Revenue - Schedule of Deferred

Revenue - Schedule of Deferred Revenue Included in Contract Liabilities (Detail) - USD ($) $ in Thousands	3 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021
Revenue Recognition [Abstract]
Contract Liabilities, Balance	$ 27,854	$ 25,061	$ 15,689
Contract Liabilities, Billings	71,586	66,504	62,341
Contract Liabilities, Revenue Recognized	(69,751)	(63,711)	(52,969)
Contract Liabilities, Balance	$ 29,689	$ 27,854	$ 25,061

Fair Value Measurements - Asset

Fair Value Measurements - Assets Carried at Fair Value and Measured on Recurring Basis (Detail) - Fair Value, Measurements, Recurring [Member] - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Assets:
Total assets	$ 5,085	$ 84
Liabilities:
Total liabilities	5,070	2,778
Short-Term Investments [Member]
Assets:
Total assets	5,085	84
Contingent Consideration - Current [Member]
Liabilities:
Total liabilities	3,116	1,027
Contingent Consideration - Non current [Member]
Liabilities:
Total liabilities	1,954	1,751
Significant Other Observable Inputs (Level 2) [Member]
Assets:
Total assets	5,085	84
Significant Other Observable Inputs (Level 2) [Member] | Short-Term Investments [Member]
Assets:
Total assets	5,085	84
Significant Unobservable Inputs (Level 3) [Member]
Liabilities:
Total liabilities	5,070	2,778
Significant Unobservable Inputs (Level 3) [Member] | Contingent Consideration - Current [Member]
Liabilities:
Total liabilities	3,116	1,027
Significant Unobservable Inputs (Level 3) [Member] | Contingent Consideration - Non current [Member]
Liabilities:
Total liabilities	$ 1,954	$ 1,751

Fair Value Measurements - Fair

Fair Value Measurements - Fair Value of Contingent Consideration (Detail) - Contingent Consideration [Member] - USD ($) $ in Thousands	3 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Beginning balance	$ 2,237	$ 1,984	$ 2,778
Payments on Contingent Liabilities	(27)		(1,032)
Amortization of discount on contingent liabilities	31	44	53
Remeasurement of contingent liabilities	329	209	185
Liabilities resulting from acquisitions	2,500
Ending balance	$ 5,070	$ 2,237	$ 1,984

Cash and Investments - Addition

Cash and Investments - Additional Information (Detail) - USD ($)	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Cash And Cash Equivalents [Abstract]
Cash	$ 99,383,000	$ 82,616,000
Realized gains or (losses)	$ 0	$ 0

Cash and Investments - Short-te

Cash and Investments - Short-term Investments (Detail) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 5,084	$ 84
Gross Unrealized Gains	1
Estimated Fair Value	5,085	84
Bond Funds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	5,084	84
Gross Unrealized Gains	1
Estimated Fair Value	$ 5,085	$ 84

Goodwill and Intangible Asset_2

Goodwill and Intangible Assets - Additional Information (Detail) - USD ($)	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Goodwill And Intangible Assets [Line Items]
Intangible assets with indefinite lives other than goodwill	$ 0		$ 0
Goodwill increased	18,000,000	$ 3,500,000
Changes in primarily from translation adjustments	$ 16,100,000	3,400,000
Remaining amortization period	7 years
Amortization of intangible assets	$ 6,700,000	$ 300,000
Write off of intangible assets	$ 0
Minimum [Member]
Goodwill And Intangible Assets [Line Items]
Estimated useful lives	18 months
Maximum [Member]
Goodwill And Intangible Assets [Line Items]
Estimated useful lives	19 years

Goodwill and Intangible Asset_3

Goodwill and Intangible Assets - Summary of Intangible Assets (Detail) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 130,086	$ 119,816
Accumulated Amortization	(17,435)	(10,944)
Total intangible assets	$ 112,651	108,872
Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated useful lives	18 months
Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated useful lives	19 years
Customer, Affiliate and Advertiser Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 85,572	78,283
Accumulated Amortization	(10,299)	(6,595)
Total intangible assets	$ 75,273	$ 71,688
Customer, Affiliate and Advertiser Relationships [Member] | Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated useful lives	5 years	5 years
Customer, Affiliate and Advertiser Relationships [Member] | Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated useful lives	19 years	19 years
Developed Websites, Technology and Patents [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated useful lives	10 years	10 years
Gross Carrying Amount	$ 34,877	$ 32,535
Accumulated Amortization	(3,657)	(1,315)
Total intangible assets	31,220	31,220
Trademarks, Trade Name and Domain Name [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	7,902	7,619
Accumulated Amortization	(2,219)	(1,831)
Total intangible assets	$ 5,683	$ 5,788
Trademarks, Trade Name and Domain Name [Member] | Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated useful lives	5 years	5 years
Trademarks, Trade Name and Domain Name [Member] | Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated useful lives	16 years	16 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	$ 1,135	$ 1,149
Accumulated Amortization	(1,135)	(1,149)
Non-Compete Agreement [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	600	230
Accumulated Amortization	(125)	(54)
Total intangible assets	$ 475	$ 176
Non-Compete Agreement [Member] | Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated useful lives	1 year 6 months	1 year 6 months
Non-Compete Agreement [Member] | Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated useful lives	3 years	3 years

Goodwill and Intangible Asset_4

Goodwill and Intangible Assets - Schedule of Amortization Expense of Intangible Assets (Detail) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Goodwill And Intangible Assets Disclosure [Abstract]
2021 (October 1 – December 31)	$ 2,440
2022	9,297
2023	9,130
2024	9,099
2025	9,060
Thereafter	73,625
Total intangible assets	$ 112,651	$ 108,872

Net Income Per Common Share - R

Net Income Per Common Share - Reconciliation of Numerator and Denominator Used in Calculation of Basic and Diluted Net Income Per Common Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2021	Sep. 30, 2020
Numerator:
Net income	$ 9,984	$ 5,120	$ 1,810	$ 6,782	$ 4,773	$ 2,207	$ 16,914	$ 13,762
Basic:
Weighted average shares of common stock and vested, undelivered restricted stock units outstanding	28,472,510			27,781,080			28,255,113	27,772,509
Diluted:
Weighted average shares of common stock and vested, undelivered restricted stock units outstanding	28,472,510			27,781,080			28,255,113	27,772,509
Effect of potentially dilutive shares	3,794,258			691,519			3,915,150	639,416
Total weighted average shares of common stock and vested, undelivered restricted stock units outstanding and potentially dilutive shares	32,266,768			28,472,599			32,170,263	28,411,925
Basic:
Net income applicable to common stockholders	$ 9,984	$ 5,120	$ 1,810	$ 6,782	$ 4,773	$ 2,207	$ 16,914	$ 13,762
Weighted average shares of stock outstanding	28,472,510			27,781,080			28,255,113	27,772,509
Basic net income per common share	$ 0.35			$ 0.24			$ 0.60	$ 0.50
Diluted:
Net income applicable to common stockholders	$ 10,375			$ 6,782			$ 18,085	$ 13,762
Weighted average shares of stock outstanding	32,266,768			28,472,599			32,170,263	28,411,925
Diluted net income per common share	$ 0.32			$ 0.24			$ 0.56	$ 0.48

Net Income Per Common Share -_2

Net Income Per Common Share - Reconciliation of Numerator and Denominator Used in Calculation of Basic and Diluted Net Income Per Common Share (Parenthetical) (Detail) - shares	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Calculation of Numerator and Denominator in Earnings Per Share [Line Items]
Outstanding stock options and unvested restricted stock units excluded from computation of diluted EPS	20,000	22,000	8,000	189,000
Diluted weighted average shares	32,266,768	28,472,599	32,170,263	28,411,925
Interest Expense [Member]
Calculation of Numerator and Denominator in Earnings Per Share [Line Items]
Diluted weighted average shares	2,900,000		2,900,000

Convertible Debt,Loan Agreement

Convertible Debt,Loan Agreement and Subsequent Event - Additional Information (Detail)	Oct. 29, 2021USD ($)	Dec. 24, 2018USD ($)	Dec. 31, 2020USD ($)shares$ / shares	Sep. 30, 2021USD ($)$ / shares
Line Of Credit Facility [Line Items]
Debt instrument converted			$ 1,000
Debt instrument conversion date			Sep. 14, 2025
Threshold percentage of stock price trigger			130.00%
Percentage of sale price of common stock and conversion rate			98.00%
Implied interest rate				5.00%
Fair value of liability component of debt				$ 158,800,000
Aggregate principal amount			$ 201,250,000	201,250,000
Equity component of the notes				42,500,000
Transaction costs of notes				5,250,000
Transaction costs of equity component				$ 1,404,000
Debt instrument, interest rate effective percentage				0.80%
2018 Loan Agreement [Member]
Line Of Credit Facility [Line Items]
Debt instrument basis spread on variable rate		1.375%
2018 Loan Agreement [Member] | London Interbank Offered Rate (LIBOR) [Member]
Line Of Credit Facility [Line Items]
Debt instrument basis spread on variable rate		2.00%
Western Alliance Bank [Member] | 2021 Loan Agreement [Member]
Line Of Credit Facility [Line Items]
Letter-of-credit sublimit	$ 5,000,000
Credit facility, Maturity date	Oct. 29, 2023
Western Alliance Bank [Member] | 2021 Loan Agreement [Member] | Subsequent Event [Member]
Line Of Credit Facility [Line Items]
Credit line	$ 75,000,000
Credit line, outstanding amount	$ 0
Minimum [Member]
Line Of Credit Facility [Line Items]
Debt instrument converted				$ 34,300,000
Minimum [Member] | Western Alliance Bank [Member] | 2021 Loan Agreement [Member] | London Interbank Offered Rate (LIBOR) [Member] | Subsequent Event [Member]
Line Of Credit Facility [Line Items]
Interest rate	2.00%
Maximum [Member] | Western Alliance Bank [Member] | 2021 Loan Agreement [Member] | London Interbank Offered Rate (LIBOR) [Member] | Subsequent Event [Member]
Line Of Credit Facility [Line Items]
Interest rate	2.75%
Common Stock [Member]
Line Of Credit Facility [Line Items]
Closing price of common stock | $ / shares				$ 82.42
0.125% Convertible Senior Notes [Member]
Line Of Credit Facility [Line Items]
Aggregate principal amount of term loan borrowed			$ 201,300,000
Interest rate			0.125%
Loan facility maturity date			Dec. 15, 2025
Debt instrument payment frequency				semiannually
Date of first required payment			Jun. 15, 2021
Debt instrument, conversion rate			14.1977
Debt instrument converted			$ 1,000
Conversion price of debt per share | $ / shares			$ 70.43
Debt instrument conversion date			Sep. 14, 2025
0.125% Convertible Senior Notes [Member] | Common Stock [Member]
Line Of Credit Facility [Line Items]
Number of common stock issuable upon conversion | shares			2,857,447
2018 Loan Agreement [Member] | Western Alliance Bank [Member]
Line Of Credit Facility [Line Items]
Aggregate principal amount of term loan borrowed		$ 25,000,000
Loan facility maturity date		Dec. 10, 2023

Convertible Debt,Loan Agreeme_2

Convertible Debt,Loan Agreement and Subsequent Event - Schedule of Notes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Sep. 30, 2021
Debt Disclosure [Abstract]
Aggregate principal amount	$ 201,250	$ 201,250
Less: debt discount, net of amortization	47,368	5,619
Net carrying amount	153,882	$ 195,631
Equity component (a)	$ 41,059

Convertible Debt,Loan Agreeme_3

Convertible Debt,Loan Agreement and Subsequent Event - Schedule of Notes (Parenthetical) (Detail) $ in Thousands	9 Months Ended
	Sep. 30, 2021USD ($)
Debt Disclosure [Abstract]
Transaction cost	$ 1,404

Convertible Debt,Loan Agreeme_4

Convertible Debt,Loan Agreement and Subsequent Event - Schedule Of Interest Expense Recognized (Detail) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Debt Disclosure [Abstract]
0.125% coupon	$ 189	$ 10
Amortization of debt discount and transaction costs	982	346
Interest expense recognized	$ 1,171	$ 356

Convertible Debt,Loan Agreeme_5

Convertible Debt,Loan Agreement and Subsequent Event - Schedule of Fair Value and Carrying Value of Debt Instrument (Detail) - USD ($) $ in Thousands	Sep. 30, 2021	Jan. 01, 2021	Dec. 31, 2020
Debt Disclosure [Abstract]
Convertible senior notes, Fair Value	$ 266,532		$ 218,940
Convertible senior notes, Carrying Value	$ 195,631	$ 194,649	$ 153,882

Leases and Contingencies - Addi

Leases and Contingencies - Additional Information (Detail)	May 01, 2021USD ($)	Jan. 02, 2018USD ($)	Oct. 26, 2017ft²	Apr. 30, 2021USD ($)ft²	Sep. 30, 2021USD ($)	Dec. 31, 2020USD ($)
Lessee Lease Description [Line Items]
Lessee, operating lease, existence of option to extend					true
Operating lease assets (right -of-use assets)					$ 21,626,000	$ 26,031,000
Operating lease liabilities					26,352,000
Charges, claims related to litigation					$ 0	$ 0
Minimum [Member]
Lessee Lease Description [Line Items]
Lessee, operating lease, renewal term					1 year
Maximum [Member]
Lessee Lease Description [Line Items]
Lessee, operating lease, renewal term					5 years
Third Amendment Newton Lease [Member]
Lessee Lease Description [Line Items]
Lease extension date			Dec. 31, 2029
Operating lease term option to extend			5 years
Amendment effective date			Jan. 1, 2018
Base monthly rent		$ 300,000
Percentage increase in base rent			1.00%
Third Amendment Newton Lease [Member] | Minimum [Member]
Lessee Lease Description [Line Items]
Lease agreement for office | ft²			74,000
Third Amendment Newton Lease [Member] | Maximum [Member]
Lessee Lease Description [Line Items]
Lease agreement for office | ft²			110,000
Fourth Amendment [Member]
Lessee Lease Description [Line Items]
One-time cash allowance				$ 600,000
Base monthly rent	$ 300,000
Amendment effective month and year				2021-05
Fourth Amendment [Member] | Minimum [Member]
Lessee Lease Description [Line Items]
Lease agreement for office | ft²				68,000
Fourth Amendment [Member] | Maximum [Member]
Lessee Lease Description [Line Items]
Lease agreement for office | ft²				74,000

Leases and Contingencies - Summ

Leases and Contingencies - Summary of Maturities of Operating Lease Liabilities (Detail) $ in Thousands	Sep. 30, 2021USD ($)
Operating Lease Liabilities Payments Due [Abstract]
2021 (October 1 – December 31)	$ 876
2022	4,454
2023	4,033
2024	3,986
2025	3,197
Thereafter	13,195
Total future minimum lease payments	29,741
Less imputed interest	3,389
Operating lease liabilities	$ 26,352

Leases and contingencies - Su_2

Leases and contingencies - Summary of Operating Lease Liabilities Included in Consolidated Balance Sheet (Detail) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Assets And Liabilities Lessee [Abstract]
Current operating lease liability	$ 3,675	$ 3,611
Non-current operating lease liabilities	22,677	$ 26,943
Total operating lease liabilities	$ 26,352

Leases and Contingencies - Su_3

Leases and Contingencies - Summary of Lease Costs (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Operating Lease Liabilities Payments Due [Abstract]
Operating lease expense	$ 1,109	$ 988	$ 3,362	$ 2,881
Short-term lease expense	37	13	179	67
Total lease expense	$ 1,146	$ 1,001	$ 3,541	$ 2,948

Leases and Contingencies - Su_4

Leases and Contingencies - Summary of Additional Information Related to Operating Leases (Detail)	Sep. 30, 2021
Lease Cost [Abstract]
Weighted-average remaining lease term — operating leases	4 years 4 months 24 days
Weighted-average discount rate — operating leases	4.00%

Stock-Based Compensation - Addi

Stock-Based Compensation - Additional Information (Detail) - USD ($) $ in Thousands	1 Months Ended	9 Months Ended
	Apr. 30, 2021	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020	Jun. 16, 2017
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Common stock outstanding under the plan		125,000		107,500
Expected dividend yield		0.00%
Intrinsic value of options exercised		$ 154	$ 1,000
Cash received from exercise of options		16	$ 460
Employee service share-based compensation, nonvested units, compensation cost not yet recognized		$ 77,800
Employee service share-based compensation, nonvested units, compensation cost not yet recognized, period for recognition		2 years 1 month 6 days
Restricted Stock Units [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Stock options vested		695,445	709,842
Grant date fair value of restricted stock units vested		$ 21,600	$ 14,200
Stock Option 2007 Plan [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Expiry date		2017-05
New awards granted		0
Common stock outstanding under the plan		37,500
Stock Option 2017 Plan [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Common stock outstanding under the plan		1,683,350
Common stock shares reserved for issuance					3,000,000
Common stock additional shares authorized for issuance	3,800,000
Plan effective date		Jun. 16, 2017
Common stock shares available for issuance		3,157,218
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 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
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 - Summ

Stock-Based Compensation - Summary of Stock Option Activity under Company's Plans (Detail) - USD ($) $ / shares in Units, $ in Thousands	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Options outstanding, beginning balance	107,500
Options Outstanding, Granted	20,000
Options Outstanding, Exercised	(2,500)
Options outstanding, ending balance	125,000
Options Outstanding, Options exercisable	105,000
Options Outstanding, Options vested or expected to vest	123,398
Weighted-Average Exercise Price Per Share, Options outstanding, beginning balance	$ 17.34
Weighted-Average Exercise Price Per Share, Granted	66.93
Weighted-Average Exercise Price Per Share, Exercised	6.47
Weighted- Average Exercise Price Per Share, Options outstanding, ending balance	25.49
Weighted- Average Exercise Price Per Share, Options exercisable	17.60
Weighted-Average Exercise Price Per Share, Options vested or expected to vest	$ 25.11
Weighted-Average Remaining Contractual Term in Years, Options outstanding	6 years 7 months 6 days
Weighted-Average Remaining Contractual Term in Years, Options exercisable	6 years 3 days
Weighted-Average Remaining Contractual Term in Years, Options vested or expected to vest	6 years 6 months 25 days
Aggregate Intrinsic Value, Exercised	$ 154	$ 1,000
Aggregate Intrinsic Value, Options outstanding	7,116
Aggregate Intrinsic Value, Options exercisable	6,806
Aggregate Intrinsic Value, Options vested or expected to vest	$ 7,098

Stock-Based Compensation - Su_2

Stock-Based Compensation - Summary of Restricted Stock Unit Activity Under Company's Plans (Detail) - Restricted Stock [Member] - USD ($) $ / shares in Units, $ in Thousands	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares, Nonvested outstanding, beginning balance	1,478,000
Shares, Granted	825,920
Shares, Vested	(695,445)	(709,842)
Shares, Forfeited	(13,000)
Shares, Nonvested outstanding, ending balance	1,595,475
Weighted-Average Grant Date Fair Value Per Share, Nonvested outstanding, beginning balance	$ 31.33
Weighted-Average Grant Date Fair Value Per Share, Granted	73.46
Weighted-Average Grant Date Fair Value Per Share, Vested	31.05
Weighted-Average Grant Date Fair Value Per Share, Forfeited	52.20
Weighted-Average Grant Date Fair Value Per Share, Nonvested outstanding, ending balance	$ 53.11
Aggregate Intrinsic Value, Nonvested outstanding	$ 131,499

Stockholders' Equity - Addition

Stockholders' Equity - Additional Information (Detail) - USD ($)	3 Months Ended	9 Months Ended	12 Months Ended
	Mar. 31, 2020	Sep. 30, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	May 31, 2020	Nov. 07, 2018
Schedule of Trading Securities and Other Trading Assets [Line Items]
Common stock repurchase, amount	$ 14,824,000
November 2018 Stock Repurchase Plan [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Common stock repurchase authorized amount							$ 25,000,000
Common stock repurchased, shares			736,760	411,849	243,425
Common stock repurchase, amount			$ 14,800,000	$ 7,100,000	$ 3,100,000
Stock repurchased, average price per share			$ 20.10	$ 17.14	$ 12.82
Common stock repurchase termination month and year		2020-05
May 2020 Repurchase Program [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Common stock repurchase authorized amount						$ 25,000,000
Common stock repurchase, amount		$ 0
2007 and 2017 Plans [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Common stock reserved		4,878,068
2007 and 2017 Plans [Member] | 0.125% Convertible Senior Notes [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Common stock reserved		4,000,186

Income Taxes (Benefit) - Additi

Income Taxes (Benefit) - Additional Information (Detail) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended		9 Months Ended
	Jun. 30, 2021	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Income Taxes [Line Items]
Income tax expense (benefit)		$ (3,051)	$ (219)	$ 3,992	$ 2,782
Income tax expenses decrease due to excess tax benefit of stock based compensation				5,400
United Kingdom [Member]
Income Taxes [Line Items]
Income tax expenses increase due to corporation tax				$ 3,200
Minimum [Member] | United Kingdom [Member]
Income Taxes [Line Items]
Corporation tax rate	19.00%
Maximum [Member] | United Kingdom [Member]
Income Taxes [Line Items]
Corporation tax rate	25.00%

Segment Information - Additiona

Segment Information - Additional Information (Detail)	9 Months Ended
	Sep. 30, 2021Segment
Segment Reporting Information [Line Items]
Number of operating segment	1
United Kingdom [Member]
Segment Reporting Information [Line Items]
Long lived assets percentage	31.00%

Segment Information - Net Sales

Segment Information - Net Sales by Campaign Target Area (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Revenues from External Customers and Long-Lived Assets [Line Items]
Total Revenues	$ 69,751	$ 36,244	$ 186,431	$ 102,456
Customers by Campaign Target Area [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total Revenues	69,751	36,244	186,431	102,456
North America [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total Revenues	41,852	21,663	114,306	62,518
North America [Member] | Customers by Campaign Target Area [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total Revenues	41,852	21,663	114,306	62,518
International [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total Revenues	27,899	14,581	72,125	39,938
International [Member] | Customers by Campaign Target Area [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total Revenues	$ 27,899	$ 14,581	$ 72,125	$ 39,938

Segment Information - Net Sal_2

Segment Information - Net Sales to Customers by Geographic Area (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales, Total	$ 69,751	$ 36,244	$ 186,431	$ 102,456
Unaffiliated Customers by Geographic Area [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales, Total	69,751	36,244	186,431	102,456
United States [Member] | Unaffiliated Customers by Geographic Area [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales, Total	49,440	24,970	132,709	71,604
United Kingdom [Member] | Unaffiliated Customers by Geographic Area [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales, Total	9,453	4,433	26,426	12,756
Other International [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales, Total	27,899	14,581	72,125	39,938
Other International [Member] | Unaffiliated Customers by Geographic Area [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales, Total	$ 10,858	$ 6,841	$ 27,296	$ 18,096

Segment Information - Long-Live

Segment Information - Long-Lived Assets by Geographic Area (Detail) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets, Total	$ 327,226	$ 301,651
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets, Total	224,831	195,424
International [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets, Total	$ 102,395	$ 106,227

Acquisitions - Additional Infor

Acquisitions - Additional Information (Detail) $ in Thousands	Dec. 23, 2020USD ($)	Jul. 30, 2021USD ($)	Dec. 31, 2020USD ($)Company	Sep. 30, 2021USD ($)
Business Acquisition [Line Items]
Goodwill			$ 179,118	$ 197,108
2021 Acquisition [Member]
Business Acquisition [Line Items]
Fair value of cash consideration transferred		$ 24,300
Negative working capital		700
Negative contingent consideration		2,500
Revenue growth targets and adjusted actual maximum payments		5,000
Intangible assets		11,400
Goodwill		$ 16,100
Bright TALK [Member]
Business Acquisition [Line Items]
Fair value of cash consideration transferred	$ 151,000
Goodwill	$ 71,846			$ 74,406
Date of acquisition	Dec. 23, 2020
Business acquisition expected valuation term	1 year
Bright TALK [Member] | General and Administrative [Member]
Business Acquisition [Line Items]
Transaction costs	$ 5,000
Other Acquisitions [Member]
Business Acquisition [Line Items]
Fair value of cash consideration transferred			25,000
Intangible assets			17,100
Goodwill			$ 12,700
Number of acquisitions | Company			2
Contingent consideration			$ 2,200
Assumed liabilities			$ 3,500

Acquisitions - Summary of Preli

Acquisitions - Summary of Preliminary Purchase Price Allocation (Detail) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020	Dec. 23, 2020
Business Acquisition [Line Items]
Goodwill	$ 197,108	$ 179,118
Bright TALK [Member]
Business Acquisition [Line Items]
Cash	1,997		$ 1,997
Accounts receivable	11,810		11,810
Operating lease right-of-use assets	1,986		1,986
Other assets	2,616		2,948
Goodwill	74,406		71,846
Intangible assets	90,370		90,370
Accounts payable, accrued expenses and other liabilities	(11,285)		(9,194)
Unearned revenue	(6,980)		(6,980)
Operating lease liabilities	(2,446)		(2,446)
Deferred tax liabilities and income tax payable	(11,627)		(11,490)
Net Assets acquired	150,847		$ 150,847
Bright TALK [Member] | Adjustments [Member]
Business Acquisition [Line Items]
Other assets	(332)
Goodwill	2,560
Accounts payable, accrued expenses and other liabilities	(2,091)
Deferred tax liabilities and income tax payable	$ (137)