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Marketable Investments (Tables) | 9 Months Ended
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Sep. 30, 2013
Investments Debt And Equity Securities [Abstract] |
Summary of Company's Marketable Investments | The following table summarizes the Company’s marketable investments (in thousands):
|  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Market Value |
September 30, 2013 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
State and municipal obligations |  | $ | 9,660 |  |  | $ | 5 |  |  | $ | — |  |  | $ | 9,665 |
Federal agency and corporate obligations |  |  | 77,330 |  |  |  | 131 |  |  |  | (165 | ) |  |  | 77,296 |
Total short-term available-for-sale securities |  |  | 86,990 |  |  |  | 136 |  |  |  | (165 | ) |  |  | 86,961 |
ARS, long-term |  |  | 11,000 |  |  |  | — |  |  |  | (1,908 | ) |  |  | 9,092 |
Total available-for-sale securities |  | $ | 97,990 |  |  | $ | 136 |  |  | $ | (2,073 | ) |  | $ | 96,053 |
|  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Market Value |
December 31, 2012 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
State and municipal obligations |  | $ | 18,859 |  |  | $ | 27 |  |  | $ | (14 | ) |  | $ | 18,872 |
Federal agency and corporate obligations |  |  | 115,653 |  |  |  | 380 |  |  |  | (29 | ) |  |  | 116,004 |
Total short-term available-for-sale securities |  |  | 134,512 |  |  |  | 407 |  |  |  | (43 | ) |  |  | 134,876 |
ARS, long-term |  |  | 11,000 |  |  |  | — |  |  |  | (2,030 | ) |  |  | 8,970 |
Total available-for-sale securities |  | $ | 145,512 |  |  | $ | 407 |  |  | $ | (2,073 | ) |  | $ | 143,846 |
Summary of Maturity Periods of the Marketable Securities | The following table reflects the ARS at their contractual maturity dates of between 2024 and 2034 (in thousands).
|  | FY 2013 |  |  | FY2014 |  |  | FY2015 |  |  | Thereafter |  |  | Total |
State and municipal obligations |  | $ | 2,772 |  |  | $ | 4,821 |  |  | $ | 2,072 |  |  | $ | — |  |  | $ | 9,665 |
Federal agency and corporate obligations |  |  | 7,385 |  |  |  | 25,035 |  |  |  | 28,919 |  |  |  | 15,957 |  |  |  | 77,296 |
ARS |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 9,092 |  |  |  | 9,092 |
Total |  | $ | 10,157 |  |  | $ | 29,856 |  |  | $ | 30,991 |  |  | $ | 25,049 |  |  | $ | 96,053 |
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 September 30, 2013 |
|  | Less Than 12 Months |  |  | 12 Months or Greater |
|  | Market Value |  |  | Unrealized Losses |  |  | Market Value |  |  | Unrealized Losses |
State and municipal bonds |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Federal agency and corporate obligations |  |  | 35,843 |  |  |  | 165 |  |  |  | — |  |  |  | — |
ARS |  |  | — |  |  |  | — |  |  |  | 9,092 |  |  |  | 1,908 |
Total |  | $ | 35,843 |  |  | $ | 165 |  |  | $ | 9,092 |  |  | $ | 1,908 |
|  | As of December 31, 2012 |
|  | Less Than 12 Months |  |  | 12 Months or Greater |
|  | Market Value |  |  | Unrealized Losses |  |  | Market Value |  |  | Unrealized Losses |
State and municipal bonds |  | $ | 9,430 |  |  | $ | 14 |  |  | $ | — |  |  | $ | — |
Federal agency and corporate obligations |  |  | 17,716 |  |  |  | 29 |  |  |  | — |  |  |  | — |
ARS |  |  | — |  |  |  | — |  |  |  | 8,970 |  |  |  | 2,030 |
Total |  | $ | 27,146 |  |  | $ | 43 |  |  | $ | 8,970 |  |  | $ | 2,030 |
Summary of Company's Fair Value Hierarchy for its Financial Assets | The following table represents the Company’s fair value hierarchy for its financial assets (cash equivalents and investments) measured at fair value on a recurring basis as of September 30, 2013 and December 31, 2012 (in thousands):
|  | As of September 30, 2013 |
|  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
Money market funds (1) |  | $ | 7,111 |  |  | $ | — |  |  | $ | — |  |  | $ | 7,111 |
State and municipal obligations |  |  | — |  |  |  | 9,665 |  |  |  | — |  |  |  | 9,665 |
Federal agency and corporate obligations |  |  | — |  |  |  | 77,296 |  |  |  | — |  |  |  | 77,296 |
ARS |  |  | — |  |  |  | — |  |  |  | 9,092 |  |  |  | 9,092 |
Total |  | $ | 7,111 |  |  | $ | 86,961 |  |  | $ | 9,092 |  |  | $ | 103,164 |
|  | As of December 31, 2012 |
|  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
Money market funds (1) |  | $ | 815 |  |  | $ | — |  |  | $ | — |  |  | $ | 815 |
State and municipal obligations |  |  | — |  |  |  | 18,872 |  |  |  | — |  |  |  | 18,872 |
Federal agency and corporate obligations (2) |  |  | — |  |  |  | 148,117 |  |  |  | — |  |  |  | 148,117 |
ARS |  |  | — |  |  |  | — |  |  |  | 8,970 |  |  |  | 8,970 |
Total |  | $ | 815 |  |  | $ | 166,989 |  |  | $ | 8,970 |  |  | $ | 176,774 |
(1) | Included in cash and cash equivalents.
(2) | $32.1 million are included in cash and cash equivalents at December 31, 2012 as original maturities at the time of purchase were 90 days or less.
Summary of Changes in Fair Value of Level 3 Financial Assets | The following table provides a summary of changes in fair value of the Company’s Level 3 financial assets for the nine months ended September 30, 2013 and 2012 (in thousands):
|  | ARS |
Balance at December 31, 2011 |  | $ | 9,565 |
Sales |  |  | — |
Gains included in other comprehensive income |  |  | 224 |
Balance at September 30, 2012 |  | $ | 9,789 |
|  | ARS |
Balance at December 31, 2012 |  | $ | 8,970 |
Sales |  |  | — |
Gains included in other comprehensive income |  |  | 122 |
Balance at September 30, 2013 |  | $ | 9,092 |

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- Definition Tabular disclosure of available-for-sale securities which includes, but is not limited to, changes in the cost basis and fair value, fair value and gross unrealized gain (loss), fair values by type of security, contractual maturity and classification, amortized cost basis, contracts to acquire securities to be accounted for as available-for-sale, debt maturities, transfers to trading, change in net unrealized holding gain (loss) net of tax, continuous unrealized loss position fair value, aggregate losses qualitative disclosures, other than temporary impairment (OTTI) losses or other disclosures related to available for sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27337-111563 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62557-112803 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27198-111563 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62586-112803 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
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