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Marketable Investments | 12 Months Ended
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Dec. 31, 2018
Investments Debt And Equity Securities [Abstract] |
Marketable Investments | Note 4 - Marketable Investments The Company liquidated all of its marketable investments in December of 2018 to finance the acquisition of SiriusDecisions on January 3, 2019. 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 |
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 |
Realized gains and losses are recognized into earnings at the time of the sale based on specific identification of the cost basis of each security. Realized losses on sales of the Company’s available-for-sale securities were $0.2 million for the year ended December 31, 2018 and were recorded in other income, net. Realized gains or losses on sales of the Company’s available-for-sale securities were not significant for the year ended December 31, 2017.

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