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Stockholders' Equity (Tables) | 3 Months Ended
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Mar. 31, 2018
Equity [Abstract] |
Schedule of Restricted Stock Unit Activity | Restricted stock unit activity for the three months ended March 31, 2018 is presented below (in thousands, except per share data):
|  |  |  |  |  | Weighted- |
|  |  |  |  |  | Average |
|  | Number of |  |  | Grant Date |
|  | Shares |  |  | Fair Value |
Unvested at December 31, 2017 |  |  | 509 |  |  | $ | 37.59 |
Granted |  |  | 12 |  |  |  | 39.14 |
Vested |  |  | (9 | ) |  |  | 37.39 |
Forfeited |  |  | (17 | ) |  |  | 37.62 |
Unvested at March 31, 2018 |  |  | 495 |  |  | $ | 37.63 |
Schedule of Stock Option Activity | Stock option activity for the three months ended March 31, 2018 is presented below (in thousands, except per share data and contractual term):
|  |  |  |  |  | Weighted - |  |  | Weighted - |  |  |  |  |
|  |  |  |  |  | Average |  |  | Average |  |  |  |  |
|  |  |  |  |  | Exercise |  |  | Remaining |  |  | Aggregate |
|  | Number |  |  | Price Per |  |  | Contractual |  |  | Intrinsic |
|  | of Shares |  |  | Share |  |  | Term (in years) |  |  | Value |
Outstanding at December 31, 2017 |  |  | 937 |  |  | $ | 35.10 |  |  |  |  |  |  |  |  |
Granted |  |  | — |  |  |  | — |  |  |  |  |  |  |  |  |
Exercised |  |  | (50 | ) |  |  | 33.31 |  |  |  |  |  |  |  |  |
Forfeited |  |  | (12 | ) |  |  | 35.02 |  |  |  |  |  |  |  |  |
Outstanding at March 31, 2018 |  |  | 875 |  |  | $ | 35.21 |  |  |  | 5.75 |  |  | $ | 5,465 |
Exercisable at March 31, 2018 |  |  | 625 |  |  | $ | 35.17 |  |  |  | 5.16 |  |  | $ | 3,924 |
Vested and expected to vest at March 31, 2018 |  |  | 875 |  |  | $ | 35.21 |  |  |  | 5.75 |  |  | $ | 5,465 |
Summary of Stock-Based Compensation Recorded in Expense Categories | Stock-based compensation was recorded in the following expense categories (in thousands):
|  | Three Months Ended |
|  | March 31, |
|  | 2018 |  |  | 2017 |
Cost of services and fulfillment |  | $ | 1,020 |  |  | $ | 1,197 |
Selling and marketing |  |  | 244 |  |  |  | 162 |
General and administrative |  |  | 699 |  |  |  | 690 |
Total |  | $ | 1,963 |  |  | $ | 2,049 |
Shares Subject to Employee Stock Purchase Plan Valuation Assumptions | Forrester utilizes the Black-Scholes valuation model for estimating the fair value of shares subject to purchase under the employee stock purchase plan, which were valued using the following assumptions:
|  | Three Months Ended |
|  | March 31, |
|  | 2018 |  |  | 2017 |
Average risk-free interest rate |  |  | 1.92 | % |  |  | 0.88 | %
Expected dividend yield |  |  | 2.0 | % |  |  | 1.9 | %
Expected life |  | 0.5 Years |  |  | 0.5 Years |
Expected volatility |  |  | 22 | % |  |  | 28 | %
Weighted average fair value |  | $ | 8.49 |  |  | $ | 8.49 |

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- Definition Tabular disclosure of the changes in outstanding nonvested restricted stock units. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of employee stock purchase plans, including, but not limited to: (a) expected term, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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