Goodwill and Other Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2019

Goodwill And Intangible Assets Disclosure [Abstract]

Summary of Goodwill by Segment and Changes in Carrying Amount of Goodwill

A summary of goodwill by segment and the changes in the carrying amount of goodwill is shown in the following table (in thousands):

							Sirius
	Product			Research			Decisions		Total
Balance at January 1, 2018	$	2,438		$	73,731		$	—	$	76,169
Acquisitions		10,178			—			—		10,178
Translation adjustments		(98	)		(1,084	)		—		(1,182	)
Balance at December 31, 2018		12,518			72,647			—		85,165
Reassignment		(12,518	)		12,518			—		—
Acquisition		—			16,025			142,544		158,569
Translation adjustments		—			121			40		161
Balance at December 31, 2019	$	—		$	101,311		$	142,584	$	243,895

Summary of Intangible Assets

A summary of Forrester’s intangible assets is as follows (in thousands):

	December 31, 2019
	Gross				Net
	Carrying		Accumulated		Carrying
	Amount		Amortization		Amount
Amortizable intangible assets:
Customer relationships	$	109,825	$	40,169	$	69,656
Technology		16,661		7,051		9,610
Backlog		13,000		6,500		6,500
Trademarks		12,451		854		11,597
Total	$	151,937	$	54,574	$	97,363

	December 31, 2018
	Gross				Net
	Carrying		Accumulated		Carrying
	Amount		Amortization		Amount
Amortizable intangible assets:
Customer relationships	$	32,823	$	31,604	$	1,219
Technology		3,610		295		3,315
Trademarks		443		26		417
Total	$	36,876	$	31,925	$	4,951

Summary of Estimated Intangible Assets Amortization Expense

Estimated intangible asset amortization expense for each of the five succeeding years is as follows (in thousands):

2020	$	18,843
2021		12,343
2022		11,004
2023		10,830
2024		9,720
Thereafter		34,623
Total	$	97,363