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Share Based Compensation Arrangement By Share Based Payment Award Options Expected To Vest Outstanding Percent

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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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Aggregate number of common shares reserved for future issuance.

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Face amount or stated value per share of common stock.

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Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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Gross number of share options (or share units) granted during the period.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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The increase or decrease in number of shares reserved for issuance under stock option agreements awarded under the plan that validly exist and are outstanding, including vested options.

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Amount of cost expensed and capitalized for award under share-based payment arrangement.

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Stock-Based Compensation - Additional Information (Detail)				3 Months Ended	12 Months Ended
	Aug. 22, 2017 shares	Aug. 11, 2017 USD ($)	Feb. 09, 2016 USD ($) $ / shares shares	Mar. 31, 2017 shares	Dec. 31, 2019 USD ($) plan $ / shares shares	Dec. 31, 2018 $ / shares shares	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($) shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of stock incentive plans \| plan					2
Common stock, par value (in usd per share) \| $ / shares					$ 0.0001	$ 0.0001
Restricted Stock Awards and Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized stock-based compensation expense \| $					$ 45,300,000
Stock Option Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized stock-based compensation expense \| $					$ 5,500,000
Chief Financial Officer \| Performance-Based Award
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)				223,214
Chief Executive Officer \| 2015 Performance Based Award
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Aggregate stock-based compensation expense \| $							$ 12,100,000	$ 6,800,000	$ 5,900,000
Expected to vest (in shares)					1,661,439
Canceled (in shares)					2,032,315
Chief Operating Officer \| Performance-Based Award
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)				260,416
Chief Administrative Officer \| Performance-Based Award
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)				148,810
2013 Stock Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock shares issued (in shares)					38,000,000
Shares available for grant (in shares)					12,959,690
Aggregate intrinsic value, outstanding \| $					$ 0
Stock options, granted (in shares)					1,215,789
2013 Stock Incentive Plan \| Restricted Stock Awards and Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)					0
Vested (in shares)					246,757
Canceled (in shares)					36,973
Weighted average period to be recognized					1 year 10 months 24 days
2013 Stock Incentive Plan \| Performance-Based Award
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Aggregate stock-based compensation expense \| $							1,200,000	4,100,000
2013 Stock Incentive Plan \| Stock Option Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average period to be recognized					1 year 7 months 6 days
2013 Stock Incentive Plan \| Chief Executive Officer \| Performance-Based Award
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)									3,693,754
Vested period of award shares									3 years
2017 CEO Award
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation cost \| $		$ 10,375,000					2,200,000
2017 CEO Award \| Stock Option Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award options expected to vest					33.30%
2017 CEO Award \| Chief Executive Officer \| Restricted Stock Awards and Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)	1,032,500
Vested period of award shares	3 years
Vested (in shares)	282,500
Number expected to vest (in shares)					750,000
2017 CEO Award \| Chief Executive Officer \| Stock Option Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)	612,419
Vested period of award shares	3 years
2017 CEO Award \| Chief Executive Officer \| Tranche One \| Restricted Stock Awards and Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number expected to vest (in shares)					250,000
2017 CEO Award \| Chief Executive Officer \| Tranche Two \| Restricted Stock Awards and Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number expected to vest (in shares)					250,000,000
2017 CEO Award \| Chief Executive Officer \| Tranche Three \| Restricted Stock Awards and Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number expected to vest (in shares)					250,000,000
Constant Contact 2011 Stock Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock shares issued (in shares)			10,000,000
Shares available for grant (in shares)					8,835,205
Aggregate intrinsic value, outstanding \| $			$ 22,300,000		$ 19,000
Business acquisition, estimated aggregate purchase price \| $			$ 5,400,000
Stock options, granted (in shares)					0	0
Constant Contact 2011 Stock Plan \| Restricted Stock Awards and Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding, period increase (decrease) (in shares)			2,202,846
Granted (in shares)					0
Vested (in shares)					435,919
Canceled (in shares)					111,965
Constant Contact 2011 Stock Plan \| Stock Option Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding, period increase (decrease) (in shares)			2,143,987
Aggregate stock-based compensation expense \| $					$ 16,900,000
Combined 2016 Liability Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Aggregate stock-based compensation expense \| $							$ 1,200,000	700,000
Sales and marketing \| Combined 2016 Liability Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Aggregate stock-based compensation expense \| $								300,000
Engineering and development \| Combined 2016 Liability Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Aggregate stock-based compensation expense \| $								100,000
General and administrative \| Combined 2016 Liability Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Aggregate stock-based compensation expense \| $								$ 300,000
Constant Contact, Inc.
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock, par value (in usd per share) \| $ / shares			$ 0.01
Minimum \| 2013 Stock Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options vesting period					3 years
Minimum \| 2013 Stock Incentive Plan \| Restricted Stock Awards and Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options vesting period					3 years
Minimum \| Constant Contact 2011 Stock Plan \| Restricted Stock Awards and Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vested period of award shares					3 years
Maximum \| 2013 Stock Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options vesting period					4 years
Maximum \| 2013 Stock Incentive Plan \| Restricted Stock Awards and Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options vesting period					4 years
Maximum \| Constant Contact 2011 Stock Plan \| Restricted Stock Awards and Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vested period of award shares					4 years