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Note 10 - Stock-based Compensation (Tables) | 9 Months Ended
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Sep. 27, 2020
Notes Tables |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block] |
|  | Three Months Ended |  |  | Nine Months Ended |
|  | September 27, |  |  | September 29, |  |  | September 27, |  |  | September 29, |
|  | 2020 |  |  | 2019 |  |  | 2020 |  |  | 2019 |
Cost of revenue |  | $ | 37 |  |  | $ | 15 |  |  | $ | 80 |  |  | $ | 59 |
Research and development |  |  | 51 |  |  |  | 521 |  |  |  | 73 |  |  |  | 1,708 |
Selling, general and administrative |  |  | 170 |  |  |  | 212 |  |  |  | 448 |  |  |  | 723 |
Total |  | $ | 258 |  |  | $ | 748 |  |  | $ | 601 |  |  | $ | 2,490 |
Share-based Payment Arrangement, Activity [Table Text Block] |
|  | Shares Available for Grants |
|  | 2020 Plan |
Balance at December 29, 2019 |  |  | 272 |
Authorized shares |  |  | 550 |
RSUs granted |  |  | (356 | )
PRSU's granted |  |  | (440 | )
Options cancelled |  |  | 50 |
RSUs forfeited or expired |  |  | 168 |
PRSUs forfeited or expired |  |  | 43 |
Balance at September 27, 2020 |  |  | 287 |
Share-based Payment Arrangement, Option, Activity [Table Text Block] |
|  |  |  |  |  | Weighted |  |  | Weighted |  |  |  |  |
|  |  |  |  |  | Average |  |  | Average |  |  | Aggregate |
|  | Number of |  |  | Exercise |  |  | Remaining |  |  | Intrinsic |
|  | Shares |  |  | Price |  |  | Term |  |  | Value |
|  | (in thousands) |  |  |  |  |  |  | (in years) |  |  | (in thousands) |
Balance outstanding at December 29, 2019 |  |  | 186 |  |  | $ | 32.09 |  |  |  | 3.32 |  |  |  | — |
Forfeited or expired |  |  | (50 | ) |  |  | — |  |  |  |  |  |  |  |  |
Exercised |  |  | — |  |  |  | — |  |  |  |  |  |  |  |  |
Balance outstanding at September 27, 2020 |  |  | 136 |  |  | $ | 29.37 |  |  |  | 3.60 |  |  | $ | — |
Exercisable at September 27, 2020 |  |  | 136 |  |  | $ | 29.37 |  |  |  | 3.60 |  |  | $ | — |
Vested and expected to vest at September 27, 2020 |  |  | 136 |  |  | $ | 29.37 |  |  |  | 3.60 |  |  | $ | — |
Share-based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity [Table Text Block] |
|  | RSUs & PRSUs Outstanding |
|  |  |  |  |  | Weighted |
|  |  |  |  |  | Average |
|  | Number of |  |  | Grant Date |
|  | Shares |  |  | Fair Value |
|  | (in thousands) |  |  |  |  |
Nonvested at December 29, 2019 |  |  | 377 |  |  | $ | 12.55 |
Granted |  |  | 796 |  |  | $ | 3.99 |
Vested |  |  | (137 | ) |  | $ | 10.59 |
Forfeited |  |  | (210 | ) |  | $ | — |
Nonvested at September 27, 2020 |  |  | 826 |  |  | $ | 6.24 |
Schedule of Share-based Payment Award, Employee Stock Purchase Plan, Valuation Assumptions [Table Text Block] |
|  | Three Months Ended |  |  | Nine Months Ended |
|  | September 27, |  |  | September 29, |  |  | September 27, |  |  | September 29, |
|  | 2020 |  |  | 2019 |  |  | 2020 |  |  | 2019 |
Expected term (months) |  |  | — |  |  |  | — |  |  |  | 6.08 |  |  |  | 6.00 |
Risk-free interest rate |  |  | — |  |  |  | — |  |  |  | 0.15 | % |  |  | 2.40 | %
Volatility |  |  | — |  |  |  | — |  |  |  | 88.35 | % |  |  | 53.77 | %
Dividend yield |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |

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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 of activity for award under share-based payment arrangement. Includes, but is not limited to, outstanding award at beginning and end of year, granted, exercised, forfeited, 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 (e) -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 (c)(2) -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 (d) -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 employee stock purchase plans, including, but not limited to: (a) expected term, (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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- Definition Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References No definition available. + Details
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