XML 65 R28.htm IDEA: XBRL DOCUMENT
v3.10.0.1

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 |

X
- Definition Securities available for sale unrealized loss position fair value. + References No definition available. + Details
Name: | forr_SecuritiesAvailableForSaleUnrealizedLossPositionFairValueTableTextBlock
Namespace Prefix: | forr_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_InvestmentsDebtAndEquitySecuritiesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of marketable securities. This may consist of investments in certain debt and equity securities, short-term investments and other assets. + References No definition available. + Details
Name: | us-gaap_MarketableSecuritiesTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration