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Stock-Based Compensation Plans (Tables) | 12 Months Ended
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Dec. 28, 2019
Share-based Payment Arrangement [Abstract] |
Schedule of Stock-Based Compensation Expense | Total stock-based compensation expense included in our Consolidated Statements of Operations is presented in the following table:
|  | Year Ended
(In thousands) |  | December 28, 2019 |  | December 29, 2018 |  | December 30, 2017
Cost of revenue |  | $ | 1,422 |  |  | $ | 940 |  |  | $ | 795 |
Research and development |  | 5,640 |  |  | 4,357 |  |  | 5,245 |
Selling, general, and administrative |  | 11,837 |  |  | 8,349 |  |  | 6,503 |
Total stock-based compensation |  | $ | 18,899 |  |  | $ | 13,646 |  |  | $ | 12,543 |
Schedule of Share-based Payment Award, Stock Options and Employee Stock Purchase Plan, Valuation Assumptions | The following table summarizes the assumptions used in the valuation of stock option and ESPP compensation:
| Year Ended
| December 28, 2019 |  | December 29, 2018 |  | December 30, 2017
Employee and Director Stock Options * |  |  |  |  |
Expected volatility | n/a |  | 39.87% to 41.11% |  | 40.96% to 48.01%
Risk-free interest rate | n/a |  | 2.29% to 2.78% |  | 1.99% to 2.09%
Expected term (years) | n/a |  | 4.08 to 4.25 |  | 4.08 to 4.25
Employee Stock Purchase Plan ** |  |  |  |  |
Weighted average expected volatility | 31.6% |  | 36.4% |  | n/a
Weighted average risk-free interest rate | 2.51% |  | 1.61% |  | n/a
Expected term | 6 months |  | 6 months |  | n/a
* No stock options granted during fiscal 2019
** ESPP suspended during fiscal 2017 only
Schedule of Share-based Compensation, Stock Options, Activity | The following table summarizes our stock option activity and related information for the year ended December 28, 2019:
(Shares and aggregate intrinsic value in thousands) | Shares |  | Weighted average exercise price |  | Weighted average remaining contractual term (years) |  | Aggregate Intrinsic Value
Balance, December 29, 2018 | 6,616 |  |  | $ | 5.94 |  |  |  |  |
Granted | — |  |  | — |  |  |  |  |
Effect of vesting multiplier | 36 |  |  |  |  |  |  |
Exercised | (2,715 | ) |  | 5.73 |  |  |  |  |
Forfeited or expired | (605 | ) |  | 5.72 |  |  |  |  |
Balance, December 28, 2019 | 3,332 |  |  | $ | 6.16 |  |  |  |  |
Vested and expected to vest at December 28, 2019 | 3,332 |  |  | $ | 6.16 |  |  | 4.50 |  | $ | 43,553 |
Exercisable, December 28, 2019 | 1,721 |  |  | $ | 6.00 |  |  | 3.95 |  | $ | 22,758 |
The following table summarizes the activity for our stock options and RSUs with a market condition or performance condition:
(Shares in thousands) |  | Unvested |  | Vested |  | Total
Balance, December 29, 2018 |  | 909 |  |  | — |  |  | 909 |
Granted |  | 584 |  |  | — |  |  | 584 |
Effect of vesting multiplier |  | 260 |  |  | — |  |  | 260 |
Vested |  | (484 | ) |  | 71 |  |  | (413 | )
Exercised |  | — |  |  | (71 | ) |  | (71 | )
Canceled |  | (106 | ) |  | — |  |  | (106 | )
Balance, December 28, 2019 |  | 1,163 |  |  | — |  |  | 1,163 |
Schedule of Nonvested Restricted Stock Units Activity | The following table summarizes our RSU activity for the year ended December 28, 2019:
(Shares in thousands) | Shares |  | Weighted average grant date fair value
Balance, December 29, 2018 | 4,412 |  |  | $ | 7.53 |
Granted | 2,445 |  |  | 16.23 |
Effect of vesting multiplier | 216 |  |  | — |
Vested | (1,734 | ) |  | 8.10 |
Forfeited or expired | (564 | ) |  | 7.27 |
Balance, December 28, 2019 | 4,775 |  |  | $ | 12.23 |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions | The following table summarizes the assumptions used in the valuation of stock options and RSUs with a market or performance condition:
| Year Ended
| December 28, 2019 |  | December 29, 2018 |  | December 30, 2017
Executive stock options with a market condition
Expected volatility | n/a |  | n/a |  | 41%
Risk-free interest rate | n/a |  | n/a |  | 1.9%
Expected term (years) | n/a |  | n/a |  | 4.5
Executive RSUs with a market or performance condition
Expected volatility | 40.15% to 41.10% |  | 41.06% to 41.74% |  | n/a
Risk-free interest rate | 1.66% to 2.55% |  | 2.71% to 2.87% |  | n/a
Expected term (years) | 3.00 |  | 3.00 to 3.16 |  | n/a

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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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