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Note 10 - Stock-Based Compensation Plans (Tables) | 12 Months Ended
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Jan. 02, 2021
Notes Tables |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block] |
|  | Year Ended |
|  | January 2, |  |  | December 28, |  |  | December 29, |
(In thousands) |  | 2021 |  |  | 2019 |  |  | 2018 |
Cost of revenue |  | $ | 3,179 |  |  | $ | 1,422 |  |  | $ | 940 |
Research and development |  |  | 10,124 |  |  |  | 5,640 |  |  |  | 4,357 |
Selling, general, and administrative |  |  | 27,069 |  |  |  | 11,837 |  |  |  | 8,349 |
Total stock-based compensation |  | $ | 40,372 |  |  | $ | 18,899 |  |  | $ | 13,646 |
Schedule of Share-based Payment Award, Stock Options and Employee Stock Purchase Plan, Valuation Assumptions [Table Text Block] |
|  | Year Ended |
|  | January 2, 2021 |  |  | December 28, 2019 |  |  | December 29, 2018 |
Employee and Director Stock Options * |  |  |  |  |  |  |  |  |
Expected volatility |  | n/a |  |  | n/a |  |  | 39.87% to 41.11% |
Risk-free interest rate |  | n/a |  |  | n/a |  |  | 2.29% to 2.78% |
Expected term (years) |  | n/a |  |  | n/a |  |  | 4.08 to 4.25 |
Employee Stock Purchase Plan |  |  |  |  |  |  |  |  |
Weighted average expected volatility |  | 48.2% |  |  | 31.6% |  |  | 36.4% |
Weighted average risk-free interest rate |  | 0.89% |  |  | 2.51% |  |  | 1.61% |
Expected term (in months) |  | 6 |  |  | 6 |  |  | 6 |
Share-based Payment Arrangement, Option, Activity [Table Text Block] |
(Shares and aggregate intrinsic value in thousands) |  | Shares |  |  | Weighted average exercise price |  |  | Weighted average remaining contractual term (years) |  |  | Aggregate Intrinsic Value |
Balance, December 28, 2019 |  |  | 3,332 |  |  | $ | 6.16 |  |  |  |  |  |  |  |  |
Granted |  |  | — |  |  |  | — |  |  |  |  |  |  |  |  |
Exercised |  |  | (1,057 | ) |  |  | 5.70 |  |  |  |  |  |  |  |  |
Forfeited or expired |  |  | (75 | ) |  |  | 5.69 |  |  |  |  |  |  |  |  |
Balance, January 2, 2021 |  |  | 2,200 |  |  | $ | 6.39 |  |  |  |  |  |  |  |  |
Vested and expected to vest at January 2, 2021 |  |  | 2,200 |  |  | $ | 6.39 |  |  |  | 3.86 |  |  | $ | 86,739 |
Exercisable, January 2, 2021 |  |  | 1,589 |  |  | $ | 6.40 |  |  |  | 3.66 |  |  | $ | 62,661 |
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block] |
(Shares in thousands) |  | Shares |  |  | Weighted average grant date fair value |
Balance, December 28, 2019 |  |  | 3,611 |  |  | $ | 11.50 |
Granted |  |  | 984 |  |  |  | 26.48 |
Vested |  |  | (1,424 | ) |  |  | 10.72 |
Forfeited or expired |  |  | (173 | ) |  |  | 12.03 |
Balance, January 2, 2021 |  |  | 2,998 |  |  | $ | 16.76 |
Schedule of Share-based Payment Award, Restricted Stock Units, Valuation Assumptions [Table Text Block] |
|  | Year Ended |
|  | January 2, 2021 |  |  | December 28, 2019 |  |  | December 29, 2018 |
Executive RSUs with a market condition or performance condition |  |  |  |  |  |  |  |  |
Weighted average expected volatility |  | 42.38% |  |  | 40.15% to 41.10% |  |  | 41.06% to 41.74% |
Weighted average risk-free interest rate |  | 1.40% |  |  | 1.66% to 2.55% |  |  | 2.71% to 2.87% |
Expected term (years) |  | 3.00 |  |  | 3.00 |  |  | 3.00 to 3.16 |
Share-based Payment Arrangement, Performance Shares, Outstanding Activity [Table Text Block] |
(Shares in thousands) |  | Shares |  |  | Weighted average grant date fair value |
Balance, December 28, 2019 |  |  | 1,163 |  |  | $ | 14.49 |
Granted |  |  | 349 |  |  |  | 32.23 |
Effect of vesting multiplier |  |  | 472 |  |  |  | — |
Vested |  |  | (963 | ) |  |  | 15.63 |
Canceled |  |  | — |  |  |  | — |
Balance, January 2, 2021 |  |  | 1,021 |  |  | $ | 20.42 |

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- Definition Tabular disclosure of the significant assumptions of restricted stock units used during the year to estimate the fair value of restricted stock units, including, but not limited to: (a) expected term of restricted stock units 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 No definition available. + Details
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- Definition Tabular disclosure of the significant assumptions of stock options and employee stock purchase plans 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 No definition available. + Details
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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=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 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=120381028&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=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 number and weighted-average grant date fair value for outstanding performance shares. + 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) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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