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Employee Benefit Plans (Tables) | 9 Months Ended
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Oct. 03, 2021
Employee Benefits And Share Based Compensation [Abstract] |
Schedule of Stock Option Activity | Stock option activity during the nine months ended October 3, 2021 was as follows:
|  | Number of Shares |  |  | Weighted Average Exercise Price Per Share |
|  | (In thousands) |  |  | (In dollars) |
Outstanding as of December 31, 2020 |  |  | 1,333 |  |  | $ | 27.86 |
Exercised |  |  | (393 | ) |  | $ | 22.88 |
Outstanding as of October 3, 2021 |  |  | 940 |  |  | $ | 29.93 |
Schedule of RSU Activity | RSU activity during the nine months ended October 3, 2021 was as follows:
|  | Number of Shares |  |  | Weighted Average Grant Date Fair Value Per Share |
|  | (In thousands) |  |  | (In dollars) |
Outstanding as of December 31, 2020 |  |  | 1,584 |  |  | $ | 30.66 |
Granted |  |  | 731 |  |  | $ | 38.77 |
Vested |  |  | (618 | ) |  | $ | 31.53 |
Cancelled |  |  | (114 | ) |  | $ | 33.25 |
Outstanding as of October 3, 2021 |  |  | 1,583 |  |  | $ | 33.88 |
Schedule of Performance Shares Activity | Performance shares activity during the nine months ended October 3, 2021 was as follows:
|  | Number of Shares |  |  | Weighted Average Grant Date Fair Value Per Share |
|  | (In thousands) |  |  | (In dollars) |
Outstanding as of December 31, 2020 |  |  | 141 |  |  | $ | 28.22 |
Granted |  |  | 152 |  |  | $ | 37.58 |
Vested |  |  | — |  |  | $ | — |
Cancelled |  |  | — |  |  | $ | — |
Outstanding as of October 3, 2021 |  |  | 293 |  |  | $ | 33.07 |
Schedule of Weighted Average Assumptions | The following table sets forth the weighted average assumptions used to estimate the fair value of purchase rights granted under the ESPP during the three and nine months ended October 3, 2021 and September 27, 2020:
|  | Three Months Ended |  |  | Nine Months Ended |
|  | October 3, 2021 |  |  | September 27, 2020 |  |  | October 3, 2021 |  |  | September 27, 2020 |
Expected life (in years) |  |  | 0.5 |  |  |  | 0.5 |  |  |  | 0.5 |  |  |  | 0.5 |
Risk-free interest rate |  |  | 0.05 | % |  |  | 0.12 | % |  |  | 0.05 | % |  |  | 0.72 | %
Expected volatility |  |  | 34.7 | % |  |  | 66.4 | % |  |  | 40.8 | % |  |  | 54.8 | %
Dividend yield |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Schedule of Total Stock-Based Compensation Expense Resulting from Stock Options, RSUs, Performance Shares and the ESPP | The following table sets forth the stock-based compensation expense resulting from stock options, RSUs, performance shares and the ESPP included in the Company's unaudited condensed consolidated statements of operations:
|  | Three Months Ended |  |  | Nine Months Ended |
|  | October 3, 2021 |  |  | September 27, 2020 |  |  | October 3, 2021 |  |  | September 27, 2020 |
|  | (In thousands) |
Cost of revenue |  | $ | 430 |  |  | $ | 923 |  |  | $ | 1,626 |  |  | $ | 3,129 |
Research and development |  |  | 1,414 |  |  |  | 1,138 |  |  |  | 3,832 |  |  |  | 3,879 |
Sales and marketing |  |  | 2,008 |  |  |  | 1,927 |  |  |  | 5,741 |  |  |  | 5,596 |
General and administrative |  |  | 2,358 |  |  |  | 3,230 |  |  |  | 8,873 |  |  |  | 10,122 |
Total |  | $ | 6,210 |  |  | $ | 7,218 |  |  | $ | 20,072 |  |  | $ | 22,726 |

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- Definition Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year. + 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)(1) -URI http://asc.fasb.org/extlink&oid=120381028&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=120381028&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=120381028&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=120381028&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=120381028&loc=d3e5070-113901 + Details
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