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Stock-Based Compensation Expense (Tables) | 3 Months Ended
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Mar. 29, 2020
Share-based Payment Arrangement [Abstract] |
Summary of Stock Option Activity | The following table summarizes the Company’s stock option activity for the three-month period ended March 29, 2020:
| Shares (in thousands) |  | Weighted- Average Exercise Price |  | Weighted- Average Remaining Contractual Term (in years) |  | Aggregate Intrinsic Value (in thousands)
Outstanding as of December 31, 2019 | 12,899 |  |  | $ | 37.95 |  |  |  |  |
Granted | 883 |  |  | 50.94 |  |  |  |  |
Exercised | (463 | ) |  | 21.52 |  |  |  |  |
Forfeited or expired | (83 | ) |  | 50.10 |  |  |  |  |
Outstanding as of March 29, 2020 | 13,236 |  |  | $ | 39.32 |  |  | 7.12 |  | $ | 113,087 |
Exercisable as of March 29. 2020 | 6,652 |  |  | $ | 30.93 |  |  | 6.01 |  | $ | 98,637 |
Options vested or expected to vest as of March 29, 2020 (1) | 12,139 |  |  | $ | 38.37 |  |  | 6.98 |  | $ | 112,251 |
(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
| March 29, 2020 |  | March 31, 2019
Risk-free rate | 1.6 | % |  | 2.7 | %
Expected dividend yield | 0.43 | % |  | 0.39 | %
Expected volatility | 37 | % |  | 37 | %
Expected term (in years) | 6.0 |  |  | 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
| March 29, 2020 |  | March 31, 2019
Cost of revenue | $ | 354 |  |  | $ | 451 |
Research, development, and engineering | 5,366 |  |  | 4,467 |
Selling, general, and administrative | 9,070 |  |  | 7,363 |
| $ | 14,790 |  |  | $ | 12,281 |
Schedule of Nonvested Restricted Stock Units Activity | The following table summarizes the Company's RSUs activity for the three-month period ended March 29, 2020:
| Shares (in thousands) |  | Weighted-Average Grant Date Fair Value
Nonvested as of December 31, 2019 | 150 |  |  | $ | 48.63 |
Granted | 390 |  |  | 50.94 |
Vested | — |  |  | — |
Forfeited or expired | (4 | ) |  | 50.28 |
Nonvested as of March 29, 2020 | 536 |  |  | $ | 50.30 |

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- Definition Tabular disclosure of allocation of amount expensed and capitalized for award under share-based payment arrangement to statement of income or comprehensive income and statement of financial position. Includes, but is not limited to, corresponding line item in financial statement. + 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=116856206&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=116856206&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=116856206&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=116856206&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=116856206&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=116856206&loc=d3e5070-113901 + Details
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