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Stockholders' Equity (Tables) | 9 Months Ended
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Sep. 30, 2018
Equity [Abstract] |
Schedule of Restricted Stock Unit Activity | Restricted stock unit activity for the nine months ended September 30, 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 |  |  | 245 |  |  |  | 44.01 |
Vested |  |  | (193 | ) |  |  | 36.99 |
Forfeited |  |  | (35 | ) |  |  | 37.20 |
Unvested at September 30, 2018 |  |  | 526 |  |  | $ | 40.83 |
Schedule of Stock Option Activity | Stock option activity for the nine months ended September 30, 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 |  |  | (267 | ) |  |  | 34.92 |  |  |  |  |  |  |  |  |
Forfeited |  |  | (24 | ) |  |  | 35.39 |  |  |  |  |  |  |  |  |
Outstanding at September 30, 2018 |  |  | 646 |  |  | $ | 35.17 |  |  |  | 5.27 |  |  | $ | 6,936 |
Exercisable at September 30, 2018 |  |  | 538 |  |  | $ | 35.31 |  |  |  | 4.92 |  |  | $ | 5,702 |
Vested and expected to vest at September 30, 2018 |  |  | 646 |  |  | $ | 35.17 |  |  |  | 5.27 |  |  | $ | 6,936 |
Summary of Stock-Based Compensation Recorded in Expense Categories | Stock-based compensation was recorded in the following expense categories (in thousands):
|  | Three Months Ended |  |  | Nine Months Ended |
|  | September 30, |  |  | September 30, |
|  | 2018 |  |  | 2017 |  |  | 2018 |  |  | 2017 |
Cost of services and fulfillment |  | $ | 1,001 |  |  | $ | 1,088 |  |  | $ | 3,128 |  |  | $ | 3,387 |
Selling and marketing |  |  | 261 |  |  |  | 170 |  |  |  | 752 |  |  |  | 535 |
General and administrative |  |  | 858 |  |  |  | 920 |  |  |  | 2,311 |  |  |  | 2,501 |
Total |  | $ | 2,120 |  |  | $ | 2,178 |  |  | $ | 6,191 |  |  | $ | 6,423 |
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 |  |  | Nine Months Ended |
|  | September 30, |  |  | September 30, |
|  | 2018 |  |  | 2017 |  |  | 2018 |  |  | 2017 |
Average risk-free interest rate |  |  | 2.34 | % |  |  | 0.96 | % |  |  | 1.80 | % |  |  | 0.81 | %
Expected dividend yield |  |  | 1.6 | % |  |  | 1.9 | % |  |  | 1.9 | % |  |  | 1.9 | %
Expected life |  | 0.5 Years |  |  | 0.5 Years |  |  | 0.5 Years |  |  | 0.5 Years |
Expected volatility |  |  | 25 | % |  |  | 26 | % |  |  | 22 | % |  |  | 24 | %
Weighted average fair value |  | $ | 10.87 |  |  | $ | 8.50 |  |  | $ | 8.72 |  |  | $ | 8.32 |

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- Definition Tabular disclosure of the changes in outstanding nonvested restricted stock units. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=109197908&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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=109197908&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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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