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Stock-Based Compensation Expense (Tables) | 6 Months Ended
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Jun. 30, 2019
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Summary of Stock Option Activity | The following table summarizes the Company’s stock option activity for the six-month period ended June 30, 2019:
| Shares (in thousands) |  | Weighted- Average Exercise Price |  | Weighted- Average Remaining Contractual Term (in years) |  | Aggregate Intrinsic Value (in thousands)
Outstanding as of December 31, 2018 | 13,789 |  |  | $ | 31.73 |  |  |  |  |
Granted | 2,821 |  |  | 51.37 |  |  |  |  |
Exercised | (1,239 | ) |  | 21.32 |  |  |  |  |
Forfeited or expired | (606 | ) |  | 40.27 |  |  |  |  |
Outstanding as of June 30, 2019 | 14,765 |  |  | $ | 36.00 |  |  | 7.42 |  | $ | 207,599 |
Exercisable as of June 30, 2019 | 5,867 |  |  | $ | 25.12 |  |  | 5.95 |  | $ | 138,370 |
Options vested or expected to vest as of June 30, 2019 (1) | 13,214 |  |  | $ | 34.65 |  |  | 7.25 |  | $ | 201,420 |
(1) In addition to the vested options, the Company expects a portion of the unvested options to vest at some point in the future. Options expected to vest are calculated by applying an estimated forfeiture rate to the unvested options.
Weighted-Average Assumptions Used in Estimating Fair Values of Stock Options Granted | The fair values of stock options granted in each period presented were estimated using the following weighted-average assumptions:
| Three-months Ended |  | Six-months Ended
| June 30, 2019 |  | July 1, 2018 |  | June 30, 2019 |  | July 1, 2018
Risk-free rate | 2.7 | % |  | 2.9 | % |  | 2.7 | % |  | 2.9 | %
Expected dividend yield | 0.39 | % |  | 0.32 | % |  | 0.39 | % |  | 0.32 | %
Expected volatility | 37 | % |  | 39 | % |  | 37 | % |  | 39 | %
Expected term (in years) | 5.2 |  |  | 5.4 |  |  | 5.3 |  |  | 5.3 |
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs | The following table presents the stock-based compensation expense by caption for each period presented on the Consolidated Statements of Operations (in thousands):
| Three-months Ended |  | Six-months Ended
| June 30, 2019 |  | July 1, 2018 |  | June 30, 2019 |  | July 1, 2018
Cost of revenue | $ | 329 |  |  | $ | 557 |  |  | $ | 780 |  |  | $ | 1,354 |
Research, development, and engineering | 3,550 |  |  | 3,154 |  |  | 8,017 |  |  | 7,969 |
Selling, general, and administrative | 7,088 |  |  | 5,291 |  |  | 14,451 |  |  | 12,873 |
| $ | 10,967 |  |  | $ | 9,002 |  |  | $ | 23,248 |  |  | $ | 22,196 |

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- Definition Tabular disclosure of the allocation of equity-based compensation costs to a given line item on the balance sheet and income statement for the period. This may include the reporting line for the costs and the amount capitalized and expensed. + 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 (h)(1) -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 S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5047-113901 + 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 stock options, including, but not limited to: (a) expected term of share options and similar instruments, (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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