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Marketable Investments (Tables)

12 Months Ended

Dec. 31, 2018

Investments Debt And Equity Securities [Abstract]

Summary of Company's Marketable Investments

The following table summarizes the Company’s marketable investments, all of which are classified as available-for-sale (in thousands):

	As of December 31, 2017
			Gross		Gross
	Amortized		Unrealized		Unrealized			Market
	Cost		Gains		Losses			Value
Federal agency obligations	$	1,800	$	—	$	(7	)	$	1,793
Corporate obligations		52,721		—		(181	)		52,540
Total	$	54,521	$	—	$	(188	)	$	54,333

Summary of Gross Unrealized Losses and Market Value of Available-for-Sale Securities with Unrealized Losses

The following table shows the gross unrealized losses and market value of Forrester’s available-for-sale securities with unrealized losses that are not deemed to be other-than-temporary, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position (in thousands):

	As of December 31, 2017
	Less Than 12 Months				12 Months or Greater
	Market		Unrealized		Market		Unrealized
	Value		Losses		Value		Losses
Federal agency obligations	$	—	$	—	$	1,793	$	7
Corporate obligations		31,723		149		20,817		32
Total	$	31,723	$	149	$	22,610	$	39